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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Tensor Standard Math Calculator</title>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link href="https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,600;0,700;1,400&family=IBM+Plex+Mono:wght@300;400;500;600&family=Crimson+Pro:ital,wght@0,300;0,400;1,300&display=swap" rel="stylesheet">
<style>
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
--bg-deep: #0d0d0f;
--bg-panel: #141418;
--bg-inset: #1a1a20;
--bg-hover: #1f1f28;
--border: #2a2a35;
--border-warm: #3d3526;
--text-primary: #e8e4dc;
--text-secondary: #8a8690;
--text-dim: #5a5660;
--accent-gold: #d4a843;
--accent-amber: #c4873a;
--accent-warm: #a06830;
--accent-glow: #d4a84340;
--accent-blue: #5b8fb9;
--accent-green: #6b9b6b;
--accent-rose: #b07080;
--accent-violet: #8b7bb8;
--error: #c45555;
--error-bg: #c4555510;
--warning: #c4a855;
--radius: 6px;
--radius-lg: 10px;
}
html {
font-size: 15px;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
body {
background: var(--bg-deep);
color: var(--text-primary);
font-family: 'Crimson Pro', Georgia, serif;
min-height: 100vh;
overflow-x: hidden;
}
/* Subtle grain overlay */
body::before {
content: '';
position: fixed;
inset: 0;
background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
pointer-events: none;
z-index: 9999;
}
/* ─── Layout ─── */
.app {
max-width: 1100px;
margin: 0 auto;
padding: 2.5rem 1.5rem 4rem;
}
/* ─── Header ─── */
.header {
margin-bottom: 2.5rem;
position: relative;
}
.header::after {
content: '';
position: absolute;
bottom: -1.2rem;
left: 0;
right: 0;
height: 1px;
background: linear-gradient(90deg, transparent, var(--border-warm) 20%, var(--accent-gold) 50%, var(--border-warm) 80%, transparent);
opacity: 0.5;
}
.header h1 {
font-family: 'Cormorant Garamond', Georgia, serif;
font-weight: 600;
font-size: 2.2rem;
letter-spacing: -0.02em;
color: var(--text-primary);
line-height: 1.1;
}
.header h1 span {
color: var(--accent-gold);
}
.header p {
font-size: 1rem;
color: var(--text-secondary);
margin-top: 0.4rem;
font-style: italic;
font-weight: 300;
}
/* ─── Input Area ─── */
.input-area {
display: grid;
grid-template-columns: 1fr 160px;
gap: 0.75rem;
margin-bottom: 1rem;
animation: fadeInUp 0.5s ease both;
}
@keyframes fadeInUp {
from { opacity: 0; transform: translateY(10px); }
to { opacity: 1; transform: translateY(0); }
}
.expr-input {
background: var(--bg-inset);
border: 1px solid var(--border);
color: var(--text-primary);
font-family: 'IBM Plex Mono', monospace;
font-size: 1.05rem;
font-weight: 400;
padding: 0.85rem 1.1rem;
border-radius: var(--radius-lg);
outline: none;
transition: border-color 0.25s, box-shadow 0.25s;
}
.expr-input:focus {
border-color: var(--accent-gold);
box-shadow: 0 0 0 3px var(--accent-glow);
}
.expr-input::placeholder {
color: var(--text-dim);
font-weight: 300;
}
.mode-select {
background: var(--bg-inset);
border: 1px solid var(--border);
color: var(--text-secondary);
font-family: 'Crimson Pro', serif;
font-size: 0.95rem;
padding: 0.85rem 1rem;
border-radius: var(--radius-lg);
cursor: pointer;
outline: none;
appearance: none;
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238a8690' fill='none' stroke-width='1.5'/%3E%3C/svg%3E");
background-repeat: no-repeat;
background-position: right 12px center;
transition: border-color 0.2s;
}
.mode-select:focus { border-color: var(--accent-gold); }
/* ─── Examples ─── */
.examples {
margin-bottom: 1.5rem;
animation: fadeInUp 0.5s ease 0.1s both;
}
.example-level {
margin-bottom: 0.75rem;
}
.example-level-header {
display: flex;
align-items: center;
gap: 0.5rem;
cursor: pointer;
padding: 0.35rem 0;
user-select: none;
}
.example-level-header:hover .level-label {
opacity: 1;
}
.level-pip {
width: 8px;
height: 8px;
border-radius: 50%;
flex-shrink: 0;
}
.level-label {
font-family: 'Cormorant Garamond', serif;
font-size: 0.78rem;
font-weight: 600;
letter-spacing: 0.04em;
text-transform: uppercase;
opacity: 0.7;
transition: opacity 0.2s;
}
.level-chevron {
font-size: 0.6rem;
opacity: 0.4;
transition: transform 0.25s ease, opacity 0.2s;
margin-left: auto;
}
.example-level.open .level-chevron {
transform: rotate(90deg);
opacity: 0.7;
}
.example-level-body {
display: none;
flex-wrap: wrap;
gap: 0.4rem;
padding: 0.35rem 0 0.35rem 1.1rem;
}
.example-level.open .example-level-body {
display: flex;
}
.example-btn {
position: relative;
background: var(--bg-panel);
border: 1px solid var(--border);
color: var(--text-secondary);
font-family: 'IBM Plex Mono', monospace;
font-size: 0.75rem;
font-weight: 400;
padding: 0.4rem 0.75rem;
border-radius: 4px;
cursor: pointer;
transition: all 0.2s;
white-space: nowrap;
}
.example-btn:hover {
background: var(--bg-hover);
color: var(--accent-gold);
}
.example-btn:active {
transform: scale(0.97);
}
.example-btn .ex-tooltip {
display: none;
position: absolute;
bottom: calc(100% + 6px);
left: 50%;
transform: translateX(-50%);
background: var(--bg-deep);
border: 1px solid var(--border-warm);
color: var(--text-secondary);
font-family: 'Cormorant Garamond', serif;
font-size: 0.78rem;
font-style: italic;
padding: 0.4rem 0.7rem;
border-radius: 4px;
white-space: nowrap;
pointer-events: none;
z-index: 20;
box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}
.example-btn .ex-tooltip::after {
content: '';
position: absolute;
top: 100%;
left: 50%;
transform: translateX(-50%);
border: 5px solid transparent;
border-top-color: var(--border-warm);
}
.example-btn:hover .ex-tooltip {
display: block;
}
/* Level accent colors */
.level-color-1 { --level-accent: #7eb8a0; }
.level-color-2 { --level-accent: #b8a07e; }
.level-color-3 { --level-accent: #7e9ab8; }
.level-color-4 { --level-accent: #b87ea0; }
.level-color-5 { --level-accent: #c47e6a; }
.level-pip { background: var(--level-accent); }
.level-label { color: var(--level-accent); }
.level-color-6 { --level-accent: #a0b87e; }
.level-color-7 { --level-accent: #8eb8b8; }
.level-color-8 { --level-accent: #b8b07e; }
.level-color-1 .example-btn:hover { border-color: #7eb8a0; }
.level-color-2 .example-btn:hover { border-color: #b8a07e; }
.level-color-3 .example-btn:hover { border-color: #7e9ab8; }
.level-color-4 .example-btn:hover { border-color: #b87ea0; }
.level-color-5 .example-btn:hover { border-color: #c47e6a; }
.level-color-6 .example-btn:hover { border-color: #a0b87e; }
.level-color-7 .example-btn:hover { border-color: #8eb8b8; }
.level-color-8 .example-btn:hover { border-color: #b8b07e; }
/* ─── Syntax hint ─── */
.syntax-hint {
background: var(--bg-panel);
border: 1px solid var(--border);
border-left: 3px solid var(--accent-warm);
padding: 0.65rem 1rem;
border-radius: 0 var(--radius) var(--radius) 0;
font-size: 0.82rem;
color: var(--text-secondary);
margin-bottom: 2rem;
animation: fadeInUp 0.5s ease 0.15s both;
}
.syntax-hint code {
font-family: 'IBM Plex Mono', monospace;
color: var(--accent-gold);
font-size: 0.8rem;
background: var(--bg-inset);
padding: 0.1rem 0.35rem;
border-radius: 3px;
}
/* ─── Tabs ─── */
.tabs {
animation: fadeInUp 0.5s ease 0.2s both;
}
.tab-list {
display: flex;
gap: 0;
border-bottom: 1px solid var(--border);
margin-bottom: 1.5rem;
}
.tab-btn {
background: none;
border: none;
color: var(--text-dim);
font-family: 'Cormorant Garamond', serif;
font-size: 1.05rem;
font-weight: 600;
padding: 0.7rem 1.3rem;
cursor: pointer;
position: relative;
transition: color 0.2s;
letter-spacing: 0.01em;
}
.tab-btn:hover { color: var(--text-secondary); }
.tab-btn.active {
color: var(--accent-gold);
}
.tab-btn.active::after {
content: '';
position: absolute;
bottom: -1px;
left: 0.5rem;
right: 0.5rem;
height: 2px;
background: var(--accent-gold);
border-radius: 1px;
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }
/* ─── Result Panel ─── */
.result-grid {
display: grid;
grid-template-columns: 1.3fr 0.7fr;
gap: 1.2rem;
}
@media (max-width: 768px) {
.input-area { grid-template-columns: 1fr; }
.result-grid { grid-template-columns: 1fr; }
}
.card {
background: var(--bg-panel);
border: 1px solid var(--border);
border-radius: var(--radius-lg);
overflow: hidden;
}
.card-header {
padding: 1rem 1.2rem 0.6rem;
display: flex;
align-items: center;
gap: 0.5rem;
}
.card-header h3 {
font-family: 'Cormorant Garamond', serif;
font-weight: 600;
font-size: 1.1rem;
color: var(--text-secondary);
}
.card-header .icon {
color: var(--accent-gold);
font-size: 0.9rem;
opacity: 0.7;
}
.card-body {
padding: 0.4rem 1.2rem 1.2rem;
}
/* ─── Readout blocks ─── */
.readout {
background: var(--bg-inset);
border: 1px solid var(--border);
border-radius: var(--radius);
padding: 0.75rem 1rem;
margin-bottom: 0.75rem;
}
.readout-label {
font-size: 0.65rem;
text-transform: uppercase;
letter-spacing: 0.12em;
color: var(--text-dim);
margin-bottom: 0.3rem;
font-family: 'IBM Plex Mono', monospace;
font-weight: 500;
}
.readout-value {
font-family: 'IBM Plex Mono', monospace;
font-size: 1rem;
font-weight: 400;
color: var(--text-primary);
word-break: break-all;
}
.readout-value.large {
font-size: 1.6rem;
font-weight: 500;
color: var(--accent-gold);
}
.readout-value.error {
color: var(--error);
font-size: 0.9rem;
}
/* ─── Type badges ─── */
.badges {
display: flex;
flex-wrap: wrap;
gap: 0.4rem;
margin-bottom: 0.75rem;
}
.badge {
font-family: 'IBM Plex Mono', monospace;
font-size: 0.7rem;
font-weight: 500;
padding: 0.25rem 0.6rem;
border-radius: 3px;
border: 1px solid;
}
.badge-kind { border-color: var(--accent-blue); color: var(--accent-blue); background: #5b8fb910; }
.badge-rank { border-color: var(--accent-green); color: var(--accent-green); background: #6b9b6b10; }
.badge-space { border-color: var(--accent-violet); color: var(--accent-violet); background: #8b7bb810; }
.badge-var { border-color: var(--accent-rose); color: var(--accent-rose); background: #b0708010; }
/* ─── Explanation text ─── */
.explanation {
font-size: 0.88rem;
color: var(--text-secondary);
font-style: italic;
font-weight: 300;
line-height: 1.5;
padding: 0.6rem 0.8rem;
background: var(--bg-inset);
border-radius: var(--radius);
border-left: 2px solid var(--border-warm);
}
/* ─── Trace ─── */
.trace-list {
display: flex;
flex-direction: column;
gap: 0.5rem;
}
.trace-step {
background: var(--bg-inset);
border: 1px solid var(--border);
border-radius: var(--radius);
padding: 0.7rem 1rem;
font-family: 'IBM Plex Mono', monospace;
font-size: 0.8rem;
font-weight: 300;
color: var(--text-secondary);
line-height: 1.5;
position: relative;
padding-left: 2.5rem;
opacity: 0;
animation: traceIn 0.3s ease forwards;
}
.trace-step::before {
content: attr(data-index);
position: absolute;
left: 0.8rem;
top: 0.7rem;
font-size: 0.65rem;
color: var(--text-dim);
font-weight: 500;
}
@keyframes traceIn {
from { opacity: 0; transform: translateX(-6px); }
to { opacity: 1; transform: translateX(0); }
}
.trace-empty {
color: var(--text-dim);
font-style: italic;
font-size: 0.9rem;
padding: 2rem;
text-align: center;
}
/* ─── Theory ─── */
.theory-grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 1rem;
}
@media (max-width: 768px) {
.theory-grid { grid-template-columns: 1fr; }
}
.theory-card .card-body {
display: flex;
flex-direction: column;
gap: 0.5rem;
}
.theory-rule {
background: var(--bg-inset);
border: 1px solid var(--border);
border-radius: var(--radius);
padding: 0.6rem 0.85rem;
font-size: 0.85rem;
color: var(--text-secondary);
line-height: 1.45;
}
.theory-rule strong {
color: var(--accent-gold);
font-weight: 600;
}
/* ─── Conversion rules sidebar ─── */
.main-grid {
display: grid;
grid-template-columns: 1.6fr 1fr;
gap: 1.2rem;
margin-bottom: 2rem;
animation: fadeInUp 0.5s ease 0.05s both;
}
@media (max-width: 768px) {
.main-grid { grid-template-columns: 1fr; }
}
.rules-list {
display: flex;
flex-direction: column;
gap: 0.5rem;
}
.rule-item {
background: var(--bg-inset);
border: 1px solid var(--border);
border-radius: var(--radius);
padding: 0.6rem 0.85rem;
font-size: 0.84rem;
color: var(--text-secondary);
line-height: 1.45;
}
/* ─── Error display ─── */
.error-list {
display: flex;
flex-direction: column;
gap: 0.4rem;
margin-top: 0.5rem;
}
.error-item {
background: var(--error-bg);
border: 1px solid #c4555530;
border-left: 3px solid var(--error);
border-radius: var(--radius);
padding: 0.5rem 0.75rem;
font-family: 'IBM Plex Mono', monospace;
font-size: 0.78rem;
color: var(--error);
line-height: 1.4;
}
.error-type {
font-weight: 600;
color: #e06666;
margin-right: 0.4rem;
}
.error-pos {
color: var(--text-dim);
font-size: 0.7rem;
margin-left: 0.3rem;
}
.error-pointer {
font-family: 'IBM Plex Mono', monospace;
font-size: 0.78rem;
color: var(--text-dim);
white-space: pre;
margin-top: 0.2rem;
line-height: 1.2;
}
.error-pointer .caret {
color: var(--error);
font-weight: 700;
}
/* ─── REPL Tab ─── */
.repl-container {
display: grid;
grid-template-columns: 1fr 300px;
gap: 1.2rem;
}
@media (max-width: 768px) {
.repl-container { grid-template-columns: 1fr; }
}
.repl-editor-wrap {
position: relative;
}
.repl-editor {
display: flex;
background: var(--bg-inset);
border: 1px solid var(--border);
border-radius: var(--radius-lg);
overflow: hidden;
min-height: 280px;
}
.repl-line-numbers {
background: var(--bg-panel);
padding: 0.75rem 0;
min-width: 2.8rem;
text-align: right;
border-right: 1px solid var(--border);
user-select: none;
overflow: hidden;
}
.repl-line-numbers .line-num {
display: block;
font-family: 'IBM Plex Mono', monospace;
font-size: 0.75rem;
font-weight: 400;
color: var(--text-dim);
padding: 0 0.5rem;
line-height: 1.65rem;
}
.repl-textarea {
flex: 1;
background: transparent;
border: none;
color: var(--text-primary);
font-family: 'IBM Plex Mono', monospace;
font-size: 0.88rem;
font-weight: 400;
padding: 0.75rem 1rem;
resize: vertical;
outline: none;
line-height: 1.65rem;
min-height: 280px;
tab-size: 2;
}
.repl-textarea::placeholder {
color: var(--text-dim);
font-weight: 300;
}
.repl-buttons {
display: flex;
gap: 0.5rem;
margin-top: 0.75rem;
}
.repl-btn {
background: var(--bg-panel);
border: 1px solid var(--border);
color: var(--text-secondary);
font-family: 'Cormorant Garamond', serif;
font-size: 0.95rem;
font-weight: 600;
padding: 0.55rem 1.3rem;
border-radius: var(--radius);
cursor: pointer;
transition: all 0.2s;
}
.repl-btn:hover {
background: var(--bg-hover);
border-color: var(--border-warm);
color: var(--accent-gold);
}
.repl-btn-primary {
background: var(--border-warm);
border-color: var(--accent-warm);
color: var(--accent-gold);
}
.repl-btn-primary:hover {
background: var(--accent-warm);
color: var(--text-primary);
}
.repl-output {
background: var(--bg-inset);
border: 1px solid var(--border);
border-radius: var(--radius-lg);
padding: 0.75rem 1rem;
margin-top: 0.75rem;
max-height: 300px;
overflow-y: auto;
font-family: 'IBM Plex Mono', monospace;
font-size: 0.8rem;
line-height: 1.6;
}
.repl-output-line {
padding: 0.15rem 0;
border-bottom: 1px solid #2a2a3520;
}
.repl-output-line.repl-ok {
color: var(--accent-green);
}
.repl-output-line.repl-result {
color: var(--accent-gold);
}
.repl-output-line.repl-error {
color: var(--error);
}
.repl-output-line .line-prefix {
color: var(--text-dim);
margin-right: 0.5rem;
user-select: none;
}
/* ─── Environment sidebar ─── */
.env-panel {
display: flex;
flex-direction: column;
gap: 0.75rem;
}
.env-section {
background: var(--bg-inset);
border: 1px solid var(--border);
border-radius: var(--radius);
padding: 0.6rem 0.85rem;
}
.env-section-title {
font-family: 'Cormorant Garamond', serif;
font-weight: 600;
font-size: 0.9rem;
color: var(--accent-gold);
margin-bottom: 0.4rem;
}
.env-entry {
font-family: 'IBM Plex Mono', monospace;
font-size: 0.75rem;
color: var(--text-secondary);
padding: 0.15rem 0;
line-height: 1.4;
}
.env-entry .env-name {
color: var(--accent-blue);
font-weight: 500;
}
.env-entry .env-type {
color: var(--text-dim);
}
.env-empty {
font-size: 0.8rem;
color: var(--text-dim);
font-style: italic;
}
/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }
/* ─── Spec Tab ─── */
.spec-container {
max-width: 860px;
}
.spec-meta {
display: flex;
gap: 1rem;
align-items: baseline;
margin-bottom: 1.5rem;
flex-wrap: wrap;
}
.spec-version {
font-family: 'Cormorant Garamond', serif;
font-size: 1.8rem;
font-weight: 700;
color: var(--accent-gold);
}
.spec-status {
font-size: 0.9rem;
color: var(--text-secondary);
font-style: italic;
}
.spec-controls {
display: flex;
gap: 0.5rem;
margin-bottom: 1.2rem;
}
.spec-toggle-btn {
background: var(--bg-panel);
border: 1px solid var(--border);
color: var(--text-secondary);
font-family: 'IBM Plex Mono', monospace;
font-size: 0.72rem;
padding: 0.35rem 0.8rem;
border-radius: 4px;
cursor: pointer;
transition: all 0.2s;
}
.spec-toggle-btn:hover {
border-color: var(--border-warm);
color: var(--accent-gold);
}
.spec-section {
border: 1px solid var(--border);
border-radius: var(--radius-lg);
margin-bottom: 0.6rem;
background: var(--bg-panel);
overflow: hidden;
}
.spec-section-header {
display: flex;
align-items: center;
gap: 0.6rem;
padding: 0.7rem 1rem;
cursor: pointer;
user-select: none;
transition: background 0.15s;
}
.spec-section-header:hover {
background: var(--bg-hover);
}
.spec-chevron {
font-size: 0.7rem;
color: var(--text-dim);
transition: transform 0.25s ease;
flex-shrink: 0;
width: 1rem;
text-align: center;
}
.spec-section.open .spec-chevron {
transform: rotate(90deg);
}
.spec-section-title {
font-family: 'Cormorant Garamond', serif;
font-weight: 600;
font-size: 1.05rem;
color: var(--text-primary);
flex: 1;
}
.spec-section-num {
font-family: 'IBM Plex Mono', monospace;
font-size: 0.72rem;
color: var(--accent-warm);
font-weight: 500;
min-width: 2rem;
}
.spec-section-body {
display: none;
padding: 0 1.2rem 1rem;
border-top: 1px solid var(--border);
}
.spec-section.open .spec-section-body {
display: block;
}
/* Spec content rendering */
.spec-section-body h3 {
font-family: 'Cormorant Garamond', serif;
font-weight: 600;
font-size: 0.95rem;
color: var(--accent-gold);
margin: 1rem 0 0.4rem;
}
.spec-section-body h4 {
font-family: 'Cormorant Garamond', serif;
font-weight: 600;
font-size: 0.88rem;
color: var(--text-secondary);
margin: 0.8rem 0 0.3rem;
}
.spec-section-body p {
font-size: 0.88rem;
line-height: 1.6;
color: var(--text-secondary);
margin: 0.4rem 0;
}
.spec-section-body ul, .spec-section-body ol {
padding-left: 1.4rem;
margin: 0.4rem 0;
}
.spec-section-body li {
font-size: 0.85rem;
line-height: 1.55;
color: var(--text-secondary);
margin: 0.2rem 0;
}
.spec-section-body code {
font-family: 'IBM Plex Mono', monospace;
font-size: 0.8rem;
background: var(--bg-inset);
color: var(--accent-gold);
padding: 0.1rem 0.35rem;
border-radius: 3px;
}
.spec-section-body pre {
background: var(--bg-inset);
border: 1px solid var(--border);
border-radius: var(--radius);
padding: 0.75rem 1rem;
margin: 0.5rem 0;
overflow-x: auto;
line-height: 1.5;
}
.spec-section-body pre code {
background: none;
padding: 0;
font-size: 0.78rem;
color: var(--text-primary);