styles.css

/* ========== ROOT VARIABLES ========== */
:root {
  /* Premium Color Palette */
  --primary: #6366f1;        /* Indigo - modern, professional */
  --primary-light: #818cf8;  /* Lighter indigo */
  --primary-dark: #4f46e5;   /* Darker indigo */
  --accent: #ec4899;         /* Pink - vibrant accent */
  --accent-light: #f472b6;   /* Lighter pink */
  --success: #10b981;        /* Emerald */
  --warning: #f59e0b;        /* Amber */
  --danger: #ef4444;         /* Red */

  /* Light Mode - Premium Grays */
  --bg-primary: #ffffff;
  --bg-secondary: #fafbfc;
  --bg-tertiary: #f8fafc;
  --bg-hover: #f1f5f9;
  --bg-active: #e2e8f0;

  --text-primary: #0f172a;   /* Rich black */
  --text-secondary: #475569; /* Muted slate */
  --text-muted: #64748b;    /* Light slate */
  --text-subtle: #94a3b8;   /* Very light slate */

  --border: #e2e8f0;        /* Light gray */
  --border-hover: #cbd5e1;  /* Medium gray */

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.dark-mode {
  /* Dark Mode - Premium Dark Palette */
  --bg-primary: #0f172a;     /* Deep navy */
  --bg-secondary: #1e293b;   /* Dark slate */
  --bg-tertiary: #334155;    /* Medium slate */
  --bg-hover: #475569;       /* Light slate */
  --bg-active: #64748b;      /* Lighter slate */

  --text-primary: #f8fafc;   /* Off-white */
  --text-secondary: #e2e8f0; /* Light gray */
  --text-muted: #94a3b8;    /* Medium gray */
  --text-subtle: #d6dae0;   /* Dark gray */

  --border: #334155;        /* Dark border */
  --border-hover: #475569;  /* Lighter border */

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

/* ========== GLOBAL STYLES ========== */
* {
  transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
}

body.light-mode {
  background: var(--bg-secondary);
  background-image:
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(16, 185, 129, 0.02) 0%, transparent 50%),
    radial-gradient(circle at 60% 10%, rgba(245, 158, 11, 0.02) 0%, transparent 40%),
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%2399a3b8' fill-opacity='0.02'%3E%3Ccircle cx='30' cy='30' r='1'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

body.dark-mode {
  background: var(--bg-secondary);
  background-image:
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(16, 185, 129, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 60% 10%, rgba(245, 158, 11, 0.03) 0%, transparent 40%),
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%2364748b' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='1'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* ========== TEXT SELECTION ========== */
body.light-mode::selection {
  background: rgba(99, 102, 241, 0.3);
  color: var(--text-primary);
}

body.light-mode ::selection {
  background: rgba(99, 102, 241, 0.3);
  color: var(--text-primary);
}

body.dark-mode::selection {
  background: rgba(246, 246, 249, 0.4);
  color: var(--text-primary);
}

body.dark-mode ::selection {
  background: rgba(255, 255, 255, 0.4);
  color: var(--text-primary);
}

/* Firefox support */
body.light-mode::-moz-selection {
  background: rgba(99, 102, 241, 0.3);
  color: var(--text-primary);
}

body.dark-mode::-moz-selection {
  background: rgba(99, 102, 241, 0.4);
  color: var(--text-primary);
}

/* ========== HEADER ========== */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, var(--accent) 100%);
  color: white;
  box-shadow: var(--shadow-lg);
  border-bottom: 2px solid var(--primary-light);
  position: relative;
  overflow: hidden;
}

.app-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, transparent 30%, rgba(255,255,255,0.05) 70%, transparent 100%);
  pointer-events: none;
  animation: headerShimmer 8s ease-in-out infinite;
}

@keyframes headerShimmer {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.8; }
}

.app-header::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.03) 0%, transparent 70%);
  animation: headerGlow 12s ease-in-out infinite;
  pointer-events: none;
}

@keyframes headerGlow {
  0%, 100% { transform: scale(1) rotate(0deg); opacity: 0.5; }
  50% { transform: scale(1.1) rotate(180deg); opacity: 0.8; }
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.app-logo {
  font-size: 2.2rem;
  position: relative;
  animation: logoDance 4s ease-in-out infinite;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
  transform-origin: center;
}

.app-logo::before {
  content: '⚔️';
  position: absolute;
  top: -2px;
  left: -1px;
  opacity: 0.3;
  transform: scale(1.1) rotate(-3deg);
  animation: logoShadow 4s ease-in-out infinite 0.5s;
}

@keyframes logoDance {
  0%, 100% {
    transform: rotate(0deg) scale(1);
    filter: hue-rotate(0deg) drop-shadow(0 2px 4px rgba(0,0,0,0.2));
  }
  25% {
    transform: rotate(2deg) scale(1.05);
    filter: hue-rotate(10deg) drop-shadow(0 3px 6px rgba(0,0,0,0.3));
  }
  50% {
    transform: rotate(-1deg) scale(0.98);
    filter: hue-rotate(20deg) drop-shadow(0 1px 2px rgba(0,0,0,0.1));
  }
  75% {
    transform: rotate(1deg) scale(1.02);
    filter: hue-rotate(10deg) drop-shadow(0 2px 5px rgba(0,0,0,0.25));
  }
}

@keyframes logoShadow {
  0%, 100% { opacity: 0.2; transform: scale(1.1) rotate(-3deg); }
  50% { opacity: 0.4; transform: scale(1.15) rotate(2deg); }
}

.app-title-section {
  margin: 0;
}

.app-title {
  font-size: 2rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.5px;
}

.app-subtitle {
  font-size: 0.9rem;
  margin: 0.25rem 0 0 0;
  opacity: 0.9;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.btn-theme-toggle {
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.4);
  color: white;
  font-size: 1.2rem;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.btn-theme-toggle:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.6);
  transform: scale(1.1);
}

.server-info {
  font-size: 0.9rem;
  opacity: 0.9;
}

.server-info small {
  display: block;
  opacity: 0.8;
}

.server-info span {
  font-weight: 600;
}

/* ========== LAYOUT ========== */
.chat-app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 0;
  margin: 0;
  background: var(--bg-secondary);
}

.chat-layout {
  display: flex;
  flex: 1;
  gap: 0;
  overflow: hidden;
}

/* ========== SIDEBAR ========== */
.sidebar {
  width: 300px;
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
}

.sidebar-header {
  padding: 1.75rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
}

.btn-new-chat {
  background: linear-gradient(135deg, var(--success) 0%, var(--primary) 100%);
  color: white;
  border: none;
  padding: 0.625rem 1.25rem;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.btn-new-chat::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn-new-chat:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-new-chat:hover::before {
  left: 100%;
}

.sessions-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

.session-item {
  padding: 0.875rem 1.125rem;
  margin-bottom: 0.625rem;
  background: var(--bg-primary);
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border: 2px solid transparent;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.session-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.05), transparent);
  transition: left 0.6s;
}

.session-item:hover::before {
  left: 100%;
}

.session-item:hover {
  background: var(--bg-hover);
  border-color: var(--primary);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.session-item.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
  border-color: var(--primary);
  font-weight: 600;
  box-shadow: var(--shadow);
}

.session-title {
  flex: 1;
  cursor: pointer;
}

/* ========== MAIN AREA ========== */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
}

/* ========== CONTROL PANEL ========== */
.control-panel {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.control-panel.compact {
  padding: 1rem 1.5rem;
}

.control-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.model-select,
.system-input {
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border: 2px solid var(--border);
  color: var(--text-primary);
  border-radius: 12px;
  padding: 0.875rem 1rem;
  font-size: 0.95rem;
  font-family: inherit;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

body.dark-mode .model-select,
body.dark-mode .system-input {
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  border-color: var(--border);
}

body.dark-mode .model-select:focus,
body.dark-mode .system-input:focus {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
  color: var(--text-primary);
  border-color: var(--primary);
}

.model-select::before,
.system-input::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.05), transparent);
  transition: left 0.8s ease;
  pointer-events: none;
}

.model-select:focus,
.system-input:focus {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15), var(--shadow);
  transform: translateY(-1px) scale(1.01);
}

.model-select:focus::before,
.system-input:focus::before {
  left: 100%;
}

.system-input {
  resize: vertical;
  min-height: 80px;
  font-family: inherit;
}

.system-input::placeholder {
  color: var(--text-muted);
}

body.dark-mode .system-input::placeholder {
  color: var(--text-muted);
}

/* ========== MODEL SELECTOR HEADER ========== */
.model-selection-area {
  margin-bottom: 1rem;
}

.model-selector-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.mode-toggles {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mode-toggles .form-check {
  margin: 0;
}

.mode-toggles .form-check-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.blind-mode-toggle .form-check-input:checked {
  background-color: #7c3aed;
  border-color: #7c3aed;
}

/* ========== CONTROL ACTIONS ========== */
.control-actions {
  display: flex;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.control-actions .btn {
  font-size: 0.85rem;
}

.control-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.control-options {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.form-check {
  margin: 0;
}

.form-check-input {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 4px;
  cursor: pointer;
  accent-color: var(--primary);
}

.form-check-label {
  font-size: 0.9rem;
  cursor: pointer;
  margin-left: 0.5rem;
  color: var(--text-secondary);
}

.control-buttons {
  display: flex;
  gap: 0.75rem;
}

.btn {
  padding: 0.625rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-outline-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.btn-outline-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px) rotate(0.5deg);
  box-shadow: var(--shadow);
  filter: brightness(1.02);
}

.btn-outline-primary {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
  box-shadow: var(--shadow-sm);
}

.btn-outline-primary:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow);
  filter: brightness(1.05);
}

.model-badge {
  display: inline-block;
  background: var(--primary);
  color: white;
  border-radius: 12px;
  padding: 0.25rem 0.6rem;
  font-size: 0.8rem;
  margin-left: 0.5rem;
  font-weight: 600;
}

.status-message {
  margin-top: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
}

/* ========== BLIND MODE & MODEL INSTANCES ========== */
.blind-mode-toggle {
  background: rgba(255, 193, 7, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: 6px;
  border: 1px solid rgba(255, 193, 7, 0.3);
}

.blind-mode-toggle .form-check-input:checked {
  background-color: #ffc107;
  border-color: #ffc107;
}

.blind-mode-active {
  background: rgba(255, 193, 7, 0.2);
  border-color: rgba(255, 193, 7, 0.5);
}

/* Reveal Button */
.btn-warning,
#revealModelsBtn {
  background: linear-gradient(135deg, #ffc107 0%, #ff9800 100%);
  color: #000;
  border: none;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(255, 193, 7, 0.3);
}

.btn-warning::before,
#revealModelsBtn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  transition: left 0.6s ease;
}

.btn-warning:hover,
#revealModelsBtn:hover {
  background: linear-gradient(135deg, #ffca28 0%, #ffa726 100%);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 16px rgba(255, 193, 7, 0.5);
  filter: brightness(1.05);
}

.btn-warning:hover::before,
#revealModelsBtn:hover::before {
  left: 100%;
}

.btn-warning:active,
#revealModelsBtn:active {
  transform: translateY(0) scale(0.98);
  transition: all 0.1s ease;
}

.btn-outline-info {
  background: transparent;
  color: #0dcaf0;
  border: 1px solid #0dcaf0;
}

.btn-outline-info:hover {
  background: #0dcaf0;
  color: #000;
}

.model-instances-panel {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-tertiary);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.instances-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.instances-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.instance-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text-primary);
}

.instance-chip .chip-model {
  font-weight: 600;
}

.instance-chip .chip-params {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.instance-chip .chip-remove {
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.instance-chip .chip-remove:hover {
  opacity: 1;
  color: var(--danger);
}

/* Instance Configurator Modal */
.instance-configurator-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.instance-configurator {
  background: var(--bg-primary);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  padding: 1.5rem;
}

.instance-configurator h3 {
  margin: 0 0 1rem 0;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.instance-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-tertiary);
  border-radius: 8px;
  margin-bottom: 1rem;
}

.instance-form-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.instance-form-group {
  flex: 1;
  min-width: 120px;
}

.instance-form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.instance-form-group input,
.instance-form-group select {
  width: 100%;
  padding: 0.75rem 0.875rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.instance-form-group input:focus,
.instance-form-group select:focus {
  border-color: var(--primary);
  outline: none;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15), var(--shadow);
  transform: translateY(-1px) scale(1.01);
}

/* Instance Configurator Add Form */
.add-instance-section {
  margin-bottom: 1.5rem;
}

.add-instance-section h4 {
  margin: 0 0 1rem 0;
  color: var(--text-primary);
  font-size: 1.1rem;
}

.add-instance-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-primary);
  border: 2px solid var(--border);
  border-radius: 12px;
}

.add-instance-form .form-select {
  padding: 0.875rem 1rem;
  border: 2px solid var(--border);
  border-radius: 12px;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  width: 100%;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  cursor: pointer;
}

.add-instance-form .form-select:focus {
  border-color: var(--primary);
  outline: none;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15), var(--shadow);
  transform: translateY(-1px) scale(1.01);
}

.hyperparam-inputs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  padding: 1rem;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border-radius: 14px;
  border: 1px solid var(--border);
}

.param-input {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  background: var(--bg-primary);
  padding: 1rem;
  border-radius: 12px;
  border: 2px solid var(--border);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.param-input::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.05), transparent);
  transition: left 0.7s ease;
  pointer-events: none;
}

.param-input:hover::before {
  left: 100%;
}

.param-input:hover {
  border-color: var(--primary);
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-md);
}

.param-input label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.25px;
  margin-bottom: 0.25rem;
}

.param-input input {
  padding: 0.75rem 0.875rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1rem;
  text-align: center;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.param-input input:focus {
  border-color: var(--primary);
  outline: none;
  background: var(--bg-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15), inset 0 1px 2px rgba(0, 0, 0, 0.1);
  transform: scale(1.02);
}

.add-instance-form .btn-primary {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  align-self: flex-start;
}

/* Instance Cards in Configurator */
.instances-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.instance-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
}

.instance-card .instance-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.instance-card .instance-model {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
}

.instance-card .instance-params {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.instance-card .param-row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.instance-card .param-row label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.instance-card .param-row input {
  padding: 0.625rem 0.75rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  color: var(--text-primary);
  font-size: 0.9rem;
  text-align: center;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--shadow-sm);
}

.instance-card .param-row input:focus {
  border-color: var(--primary);
  outline: none;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15), var(--shadow);
  transform: scale(1.02);
}

.empty-state {
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
}

.instance-list {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.instance-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.instance-list-item:last-child {
  border-bottom: none;
}

.instance-list-item .instance-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.instance-list-item .instance-model {
  font-weight: 600;
  color: var(--text-primary);
}

.instance-list-item .instance-params {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.instance-list-item .instance-actions {
  display: flex;
  gap: 0.5rem;
}

/* Reveal Summary Modal */
.reveal-summary-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1001;
}

.reveal-summary {
  background: var(--bg-primary);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  width: 95%;
  max-width: 1400px;
  padding: 2rem;
  text-align: center;
  max-height: 85vh;
  overflow-y: auto;
}

.reveal-table-container {
  overflow-x: auto;
  margin: 1rem 0;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
}

.reveal-table-container::-webkit-scrollbar {
  height: 8px;
}

.reveal-table-container::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: 4px;
}

.reveal-table-container::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.reveal-table-container::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.reveal-table {
  width: 100%;
  min-width: 1000px;
  border-collapse: separate;
  border-spacing: 0 0.25rem;
  margin: 0;
  text-align: left;
  font-size: 1rem;
  border-radius: 12px;
  overflow: hidden;
}

.reveal-table th,
.reveal-table td {
  padding: 1rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 80px;
}

.reveal-table th:nth-child(1),
.reveal-table td:nth-child(1) {
  min-width: 120px;
}

.reveal-table th:nth-child(2),
.reveal-table td:nth-child(2) {
  min-width: 150px;
}

.reveal-table th:nth-child(3),
.reveal-table td:nth-child(3) {
  min-width: 250px;
}

.reveal-table th {
  font-weight: 600;
  color: var(--text-secondary);
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.reveal-table tbody tr {
  background: var(--bg-primary);
  border-radius: 8px;
  margin-bottom: 0.25rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
}

.reveal-table tbody tr::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.03), transparent);
  transition: left 0.8s ease;
}

.reveal-table tbody tr:hover::before {
  left: 100%;
}

.reveal-table tbody tr:hover {
  background: var(--bg-hover);
  transform: translateX(2px) scale(1.01);
  box-shadow: var(--shadow-md);
}

.reveal-table tbody tr:nth-child(odd) {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
}

.reveal-table tbody tr:nth-child(even) {
  background: var(--bg-primary);
}

.reveal-table td {
  color: var(--text-primary);
  border: none;
}

.reveal-table td:nth-child(3) {
  font-size: 0.95em;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 500px;
}

.reveal-table .votes-up {
  color: var(--success);
  font-weight: 700;
  text-align: center;
  font-size: 1.2em;
  text-shadow: 0 1px 2px rgba(16, 185, 129, 0.3);
}

.reveal-table .votes-down {
  color: var(--danger);
  font-weight: 700;
  text-align: center;
  font-size: 1.2em;
  text-shadow: 0 1px 2px rgba(239, 68, 68, 0.3);
}

/* Mobile responsive for reveal table */
@media (max-width: 768px) {
  .reveal-summary {
    width: 98%;
    max-width: none;
    padding: 1rem;
  }
  
  .reveal-table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .reveal-table {
    font-size: 0.8em;
    min-width: 800px;
  }
  
  .reveal-table th,
  .reveal-table td {
    padding: 0.4rem 0.3rem;
    white-space: nowrap;
  }
  
  .reveal-table td:nth-child(3) {
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}

/* Vote buttons in blind mode */
.vote-btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.vote-btn.disabled:hover {
  transform: none;
  background: transparent;
}

/* Blind mode indicator on arena headers */
.arena-model-name.blind-label {
  background: linear-gradient(135deg, #ffc107 0%, #ff9800 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

/* ========== MESSAGES AREA ========== */
.messages-area {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem; /* Slightly irregular spacing */
  position: relative;
}

.messages-area::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.02) 0%, transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.02) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.01) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

.msg {
  display: flex;
  gap: 0.875rem;
  animation: slideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
}

.msg:nth-child(odd) {
  animation-delay: 0.1s;
}

.msg:nth-child(even) {
  animation-delay: 0.2s;
}

@keyframes slideIn {
  0% {
    opacity: 0;
    transform: translateY(20px) rotate(-1deg) scale(0.95);
  }
  50% {
    opacity: 0.7;
    transform: translateY(-5px) rotate(0.5deg) scale(1.02);
  }
  100% {
    opacity: 1;
    transform: translateY(0) rotate(0deg) scale(1);
  }
}

.msg.user {
  justify-content: flex-end;
}

.user .bubble {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white;
  max-width: 75%;
  box-shadow: var(--shadow-md);
  position: relative;
}

.user .bubble::before {
  content: '';
  position: absolute;
  bottom: -8px;
  right: 16px;
  width: 0;
  height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-top: 8px solid var(--primary);
}

/* Ensure assistant bubbles are properly formatted */
.msg.assistant {
  justify-content: flex-start !important;
}

.msg.assistant .bubble {
  background: var(--bg-primary) !important;
  color: var(--text-primary) !important;
  border: 1px solid var(--border) !important;
  border-radius: 18px 18px 18px 4px !important;
  padding: 1.25rem 1.5rem !important;
  max-width: 75% !important;
  box-shadow: var(--shadow-sm) !important;
  display: block !important;
  visibility: visible !important;
  opacity: 1 !important;
  word-wrap: break-word !important;
  overflow-wrap: break-word !important;
  line-height: 1.65 !important;
  font-size: 0.95rem !important;
}

.assistant .bubble::before {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 16px;
  width: 0;
  height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-top: 8px solid var(--bg-primary);
  border-left: 8px solid var(--border);
  border-right: 8px solid var(--border);
}

.bubble {
  padding: 1.25rem 1.5rem;
  border-radius: 18px 18px 18px 4px; /* Slightly irregular corners */
  word-wrap: break-word;
  overflow-wrap: break-word;
  line-height: 1.65;
  font-size: 0.95rem;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1); /* Bouncy transition */
  position: relative;
  overflow: hidden;
}

.bubble::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.02) 50%, transparent 70%);
  animation: bubbleShimmer 6s ease-in-out infinite;
  pointer-events: none;
}

@keyframes bubbleShimmer {
  0%, 100% { opacity: 0; transform: translateX(-100%) translateY(-100%) rotate(45deg); }
  50% { opacity: 0.3; transform: translateX(0%) translateY(0%) rotate(45deg); }
}

.bubble:hover {
  transform: translateY(-2px) scale(1.01);
  box-shadow: var(--shadow-lg);
}

.bubble:hover::before {
  animation-duration: 3s;
}

.assistant-metrics .bubble {
  font-size: 0.85rem;
  opacity: 0.7;
  background: transparent;
  border: none;
  box-shadow: none;
  max-width: none;
}

/* ========== MARKDOWN STYLING ========== */
.assistant .bubble strong {
  font-weight: 700;
  color: var(--primary);
}

.assistant .bubble em {
  font-style: italic;
  color: var(--accent);
}

.assistant .bubble code {
  background: var(--bg-tertiary);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
  color: var(--accent);
}

.assistant .bubble pre {
  background: var(--bg-tertiary);
  padding: 0.75rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 0.5rem 0;
  font-size: 0.85em;
  border-left: 3px solid var(--primary);
}

.assistant .bubble pre code {
  padding: 0;
  background: none;
  color: inherit;
}

.assistant .bubble a {
  color: var(--primary);
  text-decoration: underline;
}

.assistant .bubble a:hover {
  text-decoration: none;
}

.assistant .bubble br {
  display: block;
  height: 0.25rem;
}

/* ========== ARENA MODE ========== */
.arena-container {
  display: flex;
  gap: 1rem;
  margin: 1rem 0;
}

.arena-col {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0;
  background: var(--bg-primary);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.arena-hdr {
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.75rem 1rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-bottom: 2px solid var(--accent-light);
}

.arena-response {
  padding: 1rem;
}

/* Ensure arena bubbles don't affect single responses */
.arena-col .bubble {
  margin: 0;
  max-width: none;
  border: none;
  background: transparent;
  box-shadow: none;
}

/* But single assistant bubbles should have proper styling */
.msg.assistant:not(.arena-col) .bubble,
.msg.assistant .bubble:not(.arena-col .bubble) {
  background: var(--bg-primary) !important;
  border: 1px solid var(--border) !important;
  box-shadow: var(--shadow-sm) !important;
  max-width: 75% !important;
}

.arena-metrics {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 0.5rem 1rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
  background: var(--bg-tertiary);
  transition: opacity 0.3s ease;
}

/* ========== INPUT AREA ========== */
.input-area {
  padding: 1.5rem;
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.input-wrapper {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

.message-input {
  flex: 1;
  padding: 0.875rem 1.125rem;
  background: var(--bg-primary);
  border: 2px solid var(--border);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  max-height: 120px;
  resize: vertical;
  box-shadow: var(--shadow-sm);
}

body.dark-mode .message-input {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border);
}

.message-input:focus {
  background: var(--bg-primary);
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1), var(--shadow-sm);
  transform: translateY(-1px);
}

body.dark-mode .message-input:focus {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--primary);
}

.message-input::placeholder {
  color: var(--text-muted);
}

body.dark-mode .message-input::placeholder {
  color: var(--text-muted);
}

body.dark-mode input::placeholder,
body.dark-mode textarea::placeholder,
body.dark-mode select::placeholder {
  color: var(--text-muted);
}

.btn-send {
  padding: 0.875rem 1.75rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 30%, var(--accent) 100%);
  color: white;
  border: none;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.btn-send::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.6s ease;
}

.btn-send::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, transparent 70%);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.btn-send:hover:not(:disabled)::before {
  left: 100%;
}

.btn-send:hover:not(:disabled)::after {
  width: 300px;
  height: 300px;
}

.btn-send:hover:not(:disabled) {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-xl);
  filter: brightness(1.1);
}

.btn-send:active:not(:disabled) {
  transform: translateY(-1px) scale(0.98);
  transition: all 0.1s ease;
}

.btn-send:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: linear-gradient(180deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border-radius: 8px;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--border) 0%, var(--text-muted) 100%);
  border-radius: 8px;
  border: 1px solid var(--bg-secondary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-hover) 100%);
  transform: scale(1.1);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

::-webkit-scrollbar-corner {
  background: var(--bg-tertiary);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .control-row {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    width: 240px;
  }
}

@media (max-width: 768px) {
  .chat-layout {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    max-height: 200px;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  
  .control-row {
    grid-template-columns: 1fr;
  }
  
  .arena-container {
    flex-direction: column;
  }
  
  .header-right {
    gap: 1rem;
  }
  
  .app-title {
    font-size: 1.5rem;
  }
  
  .user .bubble,
  .assistant .bubble {
    max-width: 90%;
  }
}

/* ========== NEW FEATURES ========== */

/* Stop button styling */
.btn-stop {
  background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%) !important;
  color: white !important;
  animation: pulse-stop 2s infinite;
}

@keyframes pulse-stop {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(239, 68, 68, 0);
  }
}

/* Loading spinner animation */
.loading-spinner {
  display: inline-block;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Helper text */
.helper-text {
  padding: 0.75rem 1rem;
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
  border-left: 3px solid var(--primary);
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Inline editing for session titles */
.session-title-edit {
  flex-grow: 1;
  padding: 0.25rem 0.5rem;
  border: 2px solid var(--primary);
  border-radius: 4px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.session-edit-btn {
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.session-item:hover .session-edit-btn {
  opacity: 1;
}

/* Enhanced stream toggle */
.form-check-label {
  font-weight: 600;
  user-select: none;
}

.form-check-input:checked ~ .form-check-label {
  color: var(--success);
}

.form-switch .form-check-input {
  width: 3rem;
  height: 1.5rem;
  background-color: var(--border);
}

.form-switch .form-check-input:checked {
  background-color: var(--success);
  border-color: var(--success);
}

/* Enhanced status messages */
.status-message {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Active conversation stronger indicator */
.session-item.active {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.15) 0%, rgba(124, 58, 237, 0.15) 100%);
  border-color: var(--primary);
  border-left: 4px solid var(--primary);
  font-weight: 700;
  padding-left: calc(1rem - 4px);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

.session-item.active::before {
  content: '▶';
  margin-right: 0.5rem;
  color: var(--primary);
}

/* Hover effects for inactive sessions */
.session-item:not(.active):hover {
  background: var(--bg-secondary);
  border-color: var(--primary);
  transform: translateX(3px);
}

/* ========== NEW FEATURE STYLES ========== */

/* Arena header with action buttons */
.arena-hdr {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
}

.arena-model-name {
  font-weight: 700;
  font-size: 0.9rem;
}

.arena-actions {
  display: flex;
  gap: 0.35rem;
}

.arena-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.arena-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  transform: translateY(-1px);
}

/* Vote buttons */
.vote-container {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.75rem;
  border-top: 1px solid var(--border);
  background: var(--bg-tertiary);
}

.vote-btn {
  background: transparent;
  border: 2px solid var(--border);
  font-size: 1.2rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.vote-btn:hover {
  transform: scale(1.1);
}

.vote-up:hover {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.1);
}

.vote-down:hover {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
}

.vote-btn.voted.vote-up {
  background: var(--success);
  border-color: var(--success);
  animation: voteSuccess 0.3s ease;
}

.vote-btn.voted.vote-down {
  background: var(--danger);
  border-color: var(--danger);
  animation: voteSuccess 0.3s ease;
}

@keyframes voteSuccess {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.2); }
}

/* Ensure action buttons are always visible */
.msg.assistant .response-actions {
  display: flex !important;
  opacity: 1 !important;
  visibility: visible !important;
  margin-top: 0.75rem !important;
  padding-left: 0 !important;
}

.msg.assistant .action-btn {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  opacity: 1 !important;
  visibility: visible !important;
  min-width: 60px !important;
  font-size: 0.8rem !important;
}

.action-btn {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.5rem 0.875rem;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  opacity: 1 !important;
  visibility: visible !important;
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
}

.action-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  transition: left 0.4s;
}

.action-btn:hover::before {
  left: 100%;
}

body.light-mode .action-btn {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border);
}

body.light-mode .action-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

body.dark-mode .action-btn {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border);
}

body.dark-mode .action-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.action-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.response-metrics {
  font-size: 0.85em;
  opacity: 0.7;
  margin-top: 0.25rem;
  color: var(--text-muted);
}

/* Single model banner */
.single-model-banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
  border-bottom: 2px solid var(--primary);
  border-left: 4px solid var(--primary);
  margin-bottom: 0.5rem;
  animation: slideDown 0.3s ease;
}

.single-model-banner span {
  font-weight: 600;
  color: var(--text-primary);
}

/* Prompt library */
.prompt-library-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.prompt-dropdown {
  display: none;
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  max-height: 400px;
  overflow-y: auto;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  margin-bottom: 0.5rem;
}

.prompt-dropdown-header {
  padding: 1rem;
  font-weight: 700;
  font-size: 1rem;
  border-bottom: 2px solid var(--border);
  background: var(--bg-tertiary);
  position: sticky;
  top: 0;
  z-index: 1;
}

.prompt-category {
  padding: 0.75rem 1rem 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  background: var(--bg-secondary);
}

.prompt-item {
  padding: 0.75rem 1rem;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: all 0.2s ease;
}

.prompt-item:hover {
  background: var(--bg-tertiary);
  border-left-color: var(--primary);
  transform: translateX(3px);
}

.prompt-dropdown-footer {
  padding: 0.75rem;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  position: sticky;
  bottom: 0;
  text-align: center;
}

/* File upload */
.btn-file-upload {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1.2rem;
  width: 45px;
  height: 45px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-file-upload:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Files List Container - Compact & Collapsible */
.files-list-container {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 0.5rem;
  overflow: hidden;
  transition: all 0.3s ease;
}

.files-list-header {
  padding: 0.5rem 0.75rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  font-weight: 600;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  transition: all 0.2s ease;
}

.files-list-header:hover {
  opacity: 0.9;
}

.collapse-icon {
  font-size: 0.7rem;
  transition: transform 0.3s ease;
}

.files-list-items {
  padding: 0.25rem;
  max-height: 120px;
  overflow-y: auto;
  animation: slideDown 0.3s ease;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.5rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: 0.25rem;
  transition: all 0.2s ease;
}

.file-item:hover {
  border-color: var(--primary);
  box-shadow: 0 1px 4px rgba(37, 99, 235, 0.1);
}

.file-item:last-child {
  margin-bottom: 0;
}

.file-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
}

.file-name {
  flex: 1;
  font-size: 0.85rem;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.file-size {
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.file-remove-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.85rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.file-remove-btn:hover {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
  transform: scale(1.05);
}

.clear-all-files-btn {
  width: 100%;
  padding: 0.4rem;
  background: var(--bg-secondary);
  border: none;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.2s ease;
  font-weight: 500;
}

.clear-all-files-btn:hover {
  background: var(--danger);
  color: white;
}

/* Collapsed state */
.files-list-container.collapsed {
  margin-bottom: 0.5rem;
}

.files-list-container.collapsed .files-list-items,
.files-list-container.collapsed .clear-all-files-btn {
  display: none;
}

/* Scrollbar styling for file list */
.files-list-items::-webkit-scrollbar {
  width: 6px;
}

.files-list-items::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 3px;
}

.files-list-items::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.files-list-items::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Input area positioning */
.input-area {
  position: relative;
  padding: 1.5rem;
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

/* ========== CONFIRMATION MODAL (Feature 7) ========== */
.confirm-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 10000;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.confirm-modal-content {
  background: var(--bg-primary);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 90%;
  overflow: hidden;
  animation: slideUp 0.3s ease;
}

.confirm-modal-header {
  background: var(--bg-secondary);
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.confirm-modal-header h3 {
  margin: 0;
  font-size: 1.25rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.confirm-modal-body {
  padding: 1.5rem;
}

.confirm-modal-body p {
  margin: 0;
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.confirm-modal-footer {
  padding: 1rem 1.5rem;
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.confirm-modal-footer .btn {
  padding: 0.625rem 1.5rem;
  border-radius: 6px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

/* ========== MODEL MANAGER (Feature 8) ========== */
.btn-model-manager {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
  font-size: 0.9rem;
}

.btn-model-manager:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.model-manager-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.model-manager-content {
  background: var(--bg-primary);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  max-width: 900px;
  width: 95%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: slideUp 0.3s ease;
}

.model-manager-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.model-manager-header h2 {
  margin: 0;
  color: white;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.model-manager-header .close-btn {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: all 0.2s ease;
}

.model-manager-header .close-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: rotate(90deg);
}

.model-manager-body {
  flex: 1;
  overflow: auto;
  padding: 1.5rem;
  background: var(--bg-secondary);
}

.model-manager-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--border);
}

.model-manager-tabs .tab-btn {
  background: transparent;
  border: none;
  padding: 0.75rem 1.5rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.2s ease;
  position: relative;
  bottom: -2px;
}

.model-manager-tabs .tab-btn:hover {
  color: var(--text-primary);
}

.model-manager-tabs .tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.model-search {
  margin-bottom: 1.5rem;
}

.model-search input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.2s ease;
}

.model-search input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.model-card {
  background: var(--bg-primary);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  transition: all 0.2s ease;
}

.model-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
  transform: translateY(-2px);
}

.model-card.installed {
  border-color: var(--success);
  background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(16, 185, 129, 0.05) 100%);
}

.model-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.model-card-header h4 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.model-size {
  background: var(--bg-tertiary);
  padding: 0.25rem 0.625rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.model-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0 0 1rem 0;
  line-height: 1.5;
}

.model-card-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.model-card-actions .btn {
  flex: 1;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
}

.model-card-actions .btn-primary {
  background: var(--primary);
  color: white;
}

.model-card-actions .btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.model-card-actions .btn-danger {
  background: var(--danger);
  color: white;
}

.model-card-actions .btn-danger:hover {
  background: #dc2626;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

.installed-badge {
  background: var(--success);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-progress {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-bar::after {
  content: '';
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
  animation: progressAnimation 2s ease-in-out infinite;
}

@keyframes progressAnimation {
  0% { width: 0%; }
  50% { width: 70%; }
  100% { width: 100%; }
}

.progress-text {
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: block;
}

.success-text {
  color: var(--success);
  font-weight: 600;
  font-size: 0.875rem;
}

.error-text {
  color: var(--danger);
  font-weight: 600;
  font-size: 0.875rem;
}

.loading-state, .empty-state, .error-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-secondary);
  font-size: 1rem;
}

.empty-state {
  color: var(--text-muted);
}

.error-state {
  color: var(--danger);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .arena-actions {
    flex-direction: column;
    gap: 0.25rem;
  }
  
  .arena-btn {
    font-size: 0.7rem;
    padding: 0.2rem 0.4rem;
  }
  
  .vote-container {
    gap: 0.5rem;
  }
  
  .vote-btn {
    width: 35px;
    height: 35px;
    font-size: 1rem;
  }
  
  .prompt-library-bar {
    flex-direction: column;
  }
  
  .single-model-banner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .model-manager-content {
    max-width: 100%;
    width: 100%;
    max-height: 100vh;
    border-radius: 0;
  }
  
  .models-grid {
    grid-template-columns: 1fr;
  }
  
  .btn-model-manager {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
  }
  
  /* Instance configurator responsive */
  .hyperparam-inputs {
    grid-template-columns: 1fr;
  }
  
  .instance-card .instance-params {
    grid-template-columns: 1fr;
  }
  
  .control-options {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  
  .control-buttons {
    flex-wrap: wrap;
  }
}

/* ========== HAMBURGER MENU & COLLAPSIBLE SIDEBAR ========== */
.btn-hamburger {
  display: none;
  background: transparent;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px; /* Slightly irregular spacing */
  width: 40px;
  height: 40px;
  border-radius: 10px; /* More organic shape */
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1); /* Bouncy animation */
  position: relative;
}

.btn-hamburger::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.1) 0%, transparent 50%);
  border-radius: 10px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.btn-hamburger:hover::before {
  opacity: 1;
}

.btn-hamburger:hover {
  transform: scale(1.05) rotate(2deg); /* Slight playful rotation */
  background: rgba(255, 255, 255, 0.05);
}

.btn-hamburger .hamburger-line {
  width: 22px; /* Slightly varied widths */
  height: 2px;
  background: linear-gradient(90deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  border-radius: 3px;
  transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55); /* Elastic animation */
  position: relative;
}

.btn-hamburger .hamburger-line:nth-child(1) {
  width: 20px; /* Make lines slightly different lengths */
}

.btn-hamburger .hamburger-line:nth-child(3) {
  width: 18px;
}

.btn-hamburger:hover .hamburger-line {
  transform: translateX(2px); /* Subtle slide effect */
}

.btn-hamburger:active .hamburger-line {
  transform: scaleY(1.2) translateX(1px); /* Squish effect */
}

/* Show hamburger on all screens for sidebar toggle */
.btn-hamburger {
  display: flex;
}

/* Sidebar collapsed state */
.sidebar.collapsed {
  width: 0;
  padding: 0;
  overflow: hidden;
  border-right: none;
}

.sidebar.collapsed * {
  opacity: 0;
  pointer-events: none;
}

.main-area.sidebar-collapsed {
  flex: 1;
}

/* ========== ADD MODEL ROW ========== */
.add-model-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  padding: 0.6rem;
  background: var(--bg-tertiary);
  border-radius: 10px;
  border: 1px solid var(--border);
}

.add-model-row .form-select {
  flex: 0 0 auto;
  min-width: 150px;
  max-width: 200px;
}

.temp-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-tertiary);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.temp-control label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
  white-space: nowrap;
}

.temp-control input {
  width: 60px;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.85rem;
  text-align: center;
}

.temp-control input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

/* ========== BLIND MODE BAR ========== */
.blind-mode-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 1rem;
  margin-bottom: 0.5rem;
  background: var(--bg-tertiary);
  border-radius: 8px;
  border: 2px solid transparent;
  transition: all 0.3s ease;
}

.blind-mode-bar.active {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
  border-color: #7c3aed;
}

.blind-mode-bar .blind-mode-toggle {
  margin: 0;
}

.blind-mode-bar .blind-mode-toggle .form-check-label {
  font-weight: 600;
  color: var(--text-primary);
}

.blind-mode-bar.active .form-check-label {
  color: #7c3aed;
}

/* ========== CHIPS HEADER WITH INLINE BLIND TOGGLE ========== */
.chips-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--bg-tertiary);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.chips-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.blind-mode-inline {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.blind-mode-inline .blind-mode-toggle {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.blind-mode-inline .form-check-input {
  margin: 0;
  cursor: pointer;
}

.blind-mode-inline .form-check-label {
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  margin: 0;
}

.blind-mode-inline .btn-reveal {
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: all 0.2s ease;
}

.blind-mode-inline .btn-reveal:hover {
  background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
  transform: scale(1.02);
}

.blind-mode-inline.active {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
  border: 1px solid rgba(124, 58, 237, 0.4);
}

.blind-mode-inline.active .form-check-label {
  color: #7c3aed;
  font-weight: 600;
}

/* ========== HYPERPARAMETER CONTROLS ========== */
.hyperparam-controls {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0.75rem;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border-radius: 14px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.param-control {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--bg-primary);
  padding: 0.5rem 0.75rem;
  border-radius: 10px;
  border: 2px solid var(--border);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.param-control::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
  transition: left 0.6s ease;
  pointer-events: none;
}

.param-control:hover::before {
  left: 100%;
}

.param-control:hover {
  background: var(--bg-hover);
  border-color: var(--primary);
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow);
}

.param-control label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin: 0;
  white-space: nowrap;
  font-weight: 600;
  letter-spacing: 0.25px;
}

.param-control input {
  width: 70px;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.85rem;
  text-align: center;
  font-weight: 600;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.param-control input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--bg-primary);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
  transform: scale(1.05);
}

.btn-add-model {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, var(--accent) 100%);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
  letter-spacing: 0.25px;
}

.btn-add-model::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.6s ease;
}

.btn-add-model::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, transparent 70%);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.btn-add-model:hover::before {
  left: 100%;
}

.btn-add-model:hover::after {
  width: 300px;
  height: 300px;
}

.btn-add-model:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-xl);
  filter: brightness(1.1);
}

.btn-add-model:active {
  transform: translateY(-1px) scale(0.98);
  transition: all 0.1s ease;
}

/* ========== SELECTED MODELS CHIPS ========== */
.selected-models-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
  min-height: 40px;
  padding: 0.5rem;
  background: var(--bg-tertiary);
  border-radius: 10px;
  border: 1px dashed var(--border);
}

.selected-models-chips:empty::before {
  content: 'No models selected. Add models above to compare.';
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-style: italic;
  display: flex;
  align-items: center;
  width: 100%;
  justify-content: center;
  padding: 0.5rem;
}

.empty-models-hint {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-style: italic;
  display: flex;
  align-items: center;
  width: 100%;
  justify-content: center;
  padding: 0.5rem;
}

.model-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  padding: 0.4rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  animation: chipAppear 0.3s ease;
}

@keyframes chipAppear {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.model-chip .chip-name {
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.model-chip .chip-temp,
.model-chip .chip-params {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.15rem 0.4rem;
  border-radius: 10px;
  font-size: 0.7rem;
  white-space: nowrap;
}

.model-chip .chip-remove {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.9rem;
  line-height: 1;
  transition: all 0.2s ease;
  padding: 0;
}

.model-chip .chip-remove:hover {
  background: rgba(255, 255, 255, 0.4);
  transform: scale(1.1);
}

/* Blind mode chip styling */
.model-chip.blind-mode {
  background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%);
}

.model-chip.blind-mode .chip-temp {
  display: none;
}

/* ========== SYSTEM PROMPT COLLAPSIBLE ========== */
.system-prompt-section {
  margin-bottom: 1rem;
  background: var(--bg-primary);
  border-radius: 10px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.system-prompt-section summary {
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: background 0.2s ease;
}

.system-prompt-section summary:hover {
  background: var(--bg-secondary);
}

.system-prompt-section summary::marker {
  color: var(--primary);
}

.system-prompt-section[open] summary {
  border-bottom: 1px solid var(--border);
}

.system-prompt-section .prompt-content {
  padding: 1rem;
}

.system-prompt-section textarea {
  width: 100%;
  min-height: 80px;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9rem;
  resize: vertical;
  font-family: inherit;
}

.system-prompt-section textarea:focus {
  outline: none;
  border-color: var(--primary);
  color: var(--text-primary);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

/* ========== RESPONSIVE ADJUSTMENTS FOR NEW UI ========== */
@media (max-width: 768px) {
  .add-model-row {
    flex-direction: column;
    align-items: stretch;
  }
  
  .add-model-row .form-select {
    min-width: 100%;
  }
  
  .temp-control {
    justify-content: center;
  }
  
  .btn-add-model {
    justify-content: center;
  }
  
  .model-chip .chip-name {
    max-width: 100px;
  }
  
  .sidebar.collapsed + .main-area {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .selected-models-chips {
    gap: 0.35rem;
  }
  
  .model-chip {
    font-size: 0.8rem;
    padding: 0.3rem 0.6rem;
  }
  
  .model-chip .chip-name {
    max-width: 80px;
  }
}