itsecd · Prodigysy · Feb 21, 2026 · Feb 21, 2026 · Feb 21, 2026 · Feb 21, 2026
diff --git a/index.html b/index.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Калькулятор</title>
+    <link rel="stylesheet" href="style.css">
+</head>
+<body>
+
+<div class="calculator">
+    <div class="row">
+        <div class="input-wrapper">
+            <input type="text" id="num1" autocomplete="off">
+            <span class="error-msg" id="err1"></span>
+        </div>
+
+        <div class="select-wrapper">
+            <select id="op">
+                <option value="+">+</option>
+                <option value="-">-</option>
+                <option value="*">*</option>
+                <option value="/">/</option>
+            </select>
+        </div>
+
+        <div class="input-wrapper">
+            <input type="text" id="num2" autocomplete="off">
+            <span class="error-msg" id="err2"></span>
+        </div>
+    </div>
+
+    <button id="calcBtn">подсчитать</button>
+
+    <div class="results" id="results"></div>
+</div>
+
+<script src="script.js"></script>
+</body>
+</html>
diff --git a/script.js b/script.js
@@ -0,0 +1,72 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const qs = selector => document.querySelector(selector);
+
+    const num1 = qs('#num1');
+    const num2 = qs('#num2');
+    const op = qs('#op');
+    const calcBtn = qs('#calcBtn');
+    const resultsDiv = qs('#results');
+    const err1 = qs('#err1');
+    const err2 = qs('#err2');
+
+    const history = [];
+
+    const validate = (input, errEl) => {
+        const val = input.value.trim().replace(',', '.');
+
+        if (val === '') {
+            input.classList.remove('invalid');
+            errEl.textContent = '';
+            return true;
+        }
+
+        if (isNaN(Number(val))) {
+            input.classList.add('invalid');
+            errEl.textContent = 'Только числа';
+            return false;
+        }
+
+        input.classList.remove('invalid');
+        errEl.textContent = '';
+        return true;
+    };
+
+    num1.addEventListener('input', () => validate(num1, err1));
+    num2.addEventListener('input', () => validate(num2, err2));
+
+    calcBtn.addEventListener('click', () => {
+        const isV1Valid = validate(num1, err1);
+        const isV2Valid = validate(num2, err2);
+
+        if (num1.value.trim() === '') { err1.textContent = 'Заполните поле'; num1.classList.add('invalid'); }
+        if (num2.value.trim() === '') { err2.textContent = 'Заполните поле'; num2.classList.add('invalid'); }
+
+        if (!isV1Valid || !isV2Valid || num1.value.trim() === '' || num2.value.trim() === '') return;
+
+        const n1 = parseFloat(num1.value.replace(',', '.'));
+        const n2 = parseFloat(num2.value.replace(',', '.'));
+        const operator = op.value;
+        let res;
+
+        if (operator === '+') res = n1 + n2;
+        else if (operator === '-') res = n1 - n2;
+        else if (operator === '*') res = n1 * n2;
+        else if (operator === '/') {
+            if (n2 === 0) {
+                num2.classList.add('invalid');
+                err2.textContent = 'Деление на ноль';
+                return;
+            }
+            res = n1 / n2;
+        }
+
+        res = parseFloat(res.toFixed(5));
+        history.push(`${n1} ${operator} ${n2} = ${res}`);
+
+        if (history.length > 5) history.shift();
+
+        resultsDiv.innerHTML = history.map((item, index) => 
+            `<div class="${index === history.length - 1 ? 'current-result' : 'history-item'}">${item}</div>`
+        ).join('');
+    });
+});
diff --git a/style.css b/style.css
@@ -0,0 +1,125 @@
+:root {
+    --bg-color: #a0e08b; 
+    --red: #ff0000;
+    --pale-red: #d88e8e;
+}
+
+body {
+    background-color: var(--bg-color);
+    font-family: Arial, sans-serif;
+    display: flex;
+    justify-content: center;
+    padding-top: 50px;
+    margin: 0;
+}
+
+.calculator {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 30px;
+    width: 100%;
+    max-width: 700px;
+    padding: 0 20px;
+}
+
+.row {
+    display: flex;
+    justify-content: space-between;
+    align-items: flex-start;
+    width: 100%;
+    gap: 15px;
+}
+
+.input-wrapper {
+    position: relative;
+    flex: 1;
+}
+
+input, select, button, .results {
+    border: 2px dashed var(--red);
+    border-radius: 12px;
+    background: transparent;
+    font-size: 24px;
+    color: var(--red);
+    outline: none;
+    box-sizing: border-box;
+}
+
+input {
+    width: 100%;
+    padding: 8px 15px;
+    height: 45px;
+}
+
+input.invalid {
+    border-style: solid;
+    background-color: rgba(255, 0, 0, 0.05);
+}
+
+.error-msg {
+    position: absolute;
+    bottom: -20px;
+    left: 5px;
+    font-size: 14px;
+    color: var(--red);
+    white-space: nowrap;
+}
+
+.select-wrapper {
+    position: relative;
+    height: 45px;
+}
+
+select {
+    height: 100%;
+    padding: 0 35px 0 15px;
+    cursor: pointer;
+    appearance: none;
+    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='red' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") no-repeat right 10px center;
+}
+
+button {
+    padding: 10px 40px;
+    cursor: pointer;
+    transition: transform 0.1s;
+}
+
+button:active {
+    transform: scale(0.97);
+}
+
+.results {
+    width: 100%;
+    min-height: 100px;
+    display: flex;
+    flex-direction: column;
+    justify-content: flex-end;
+    padding: 20px;
+    text-align: left;
+}
+
+.history-item {
+    color: var(--pale-red);
+    margin-bottom: 8px;
+    font-size: 22px;
+}
+
+.current-result {
+    font-weight: bold;
+    color: var(--red);
+    font-size: 24px;
+}
+
+@media (max-width: 550px) {
+    .row {
+        flex-direction: column;
+        gap: 25px;
+    }
+    .select-wrapper {
+        width: 100%;
+    }
+    select {
+        width: 100%;
+    }
+}