itsecd · kosenkomichael · Feb 28, 2026
diff --git a/index.html b/index.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+    <meta charset="UTF-8">
+    <title>Калькулятор</title>
+    <link rel="stylesheet" href="style.css">
+</head>
+<body>
+
+<div class="wrapper">
+    <div class="calculator">
+
+        <div class="inputs-row">
+
+            <div class="field-group">
+                <input type="text" id="num1" placeholder="Введите число">
+                <div class="error" id="error1"></div>
+            </div>
+
+            <select id="operationSelect" class="operation-select">
+                <option value="+">+</option>
+                <option value="-">−</option>
+                <option value="*">*</option>
+                <option value="/">/</option>
+            </select>
+
+            <div class="field-group">
+                <input type="text" id="num2" placeholder="Введите число">
+                <div class="error" id="error2"></div>
+            </div>
+
+        </div>
+
+        <button id="calculateBtn" class="calculate-btn">подсчитать</button>
+
+        <div class="results" id="results"></div>
+
+    </div>
+</div>
+
+<script src="script.js"></script>
+</body>
+</html>
diff --git a/script.js b/script.js
@@ -0,0 +1,77 @@
+const num1 = document.getElementById("num1");
+const num2 = document.getElementById("num2");
+const operationSelect = document.getElementById("operationSelect");
+const calculateBtn = document.getElementById("calculateBtn");
+const resultsDiv = document.getElementById("results");
+
+const error1 = document.getElementById("error1");
+const error2 = document.getElementById("error2");
+
+function validateInput(input, errorElement) {
+    const value = input.value.trim();
+
+    if (value === "") {
+        errorElement.textContent = "Поле не должно быть пустым";
+        input.classList.add("error-input");
+        return false;
+    }
+
+    if (!/^[-+]?\d+(\.\d+)?$/.test(value)) {
+        errorElement.textContent = "Введите корректное число";
+        input.classList.add("error-input");
+        return false;
+    }
+
+    errorElement.textContent = "";
+    input.classList.remove("error-input");
+    return true;
+}
+
+function calculate() {
+    const valid1 = validateInput(num1, error1);
+    const valid2 = validateInput(num2, error2);
+
+    if (!valid1 || !valid2) return;
+
+    const a = parseFloat(num1.value);
+    const b = parseFloat(num2.value);
+    const op = operationSelect.value;
+
+    if (op === "/" && b === 0) {
+        error2.textContent = "Деление на ноль невозможно";
+        num2.classList.add("error-input");
+        return;
+    }
+
+    let result;
+
+    switch (op) {
+        case "+": result = a + b; break;
+        case "-": result = a - b; break;
+        case "*": result = a * b; break;
+        case "/": result = a / b; break;
+    }
+
+    addToHistory(`${a} ${op} ${b} = ${result}`);
+}
+
+function addToHistory(text) {
+    const oldResults = resultsDiv.querySelectorAll(".result-new");
+
+    oldResults.forEach(el => {
+        el.classList.remove("result-new");
+        el.classList.add("result-old");
+    });
+
+    const div = document.createElement("div");
+    div.classList.add("result-new");
+    div.textContent = text;
+
+    resultsDiv.appendChild(div);
+
+    while (resultsDiv.children.length > 10) {
+        resultsDiv.removeChild(resultsDiv.firstChild);
+    }
+}
+
+calculateBtn.addEventListener("click", calculate);
diff --git a/style.css b/style.css
@@ -0,0 +1,121 @@
+* {
+    box-sizing: border-box;
+}
+
+html, body {
+    height: 100%;
+}
+
+body {
+    margin: 0;
+    background: white;
+    font-family: Arial, sans-serif;
+    border: 60px solid #d3d3d3;
+    padding: 40px;
+}
+
+.wrapper {
+    min-height: calc(100vh - 120px - 80px);
+    display: flex;
+    justify-content: flex-start;
+    align-items: flex-start;
+}
+
+.calculator {
+    background: #a8e6a3;
+    padding: 30px;
+    border-radius: 12px;
+    width: 100%;
+    max-width: 650px;
+}
+
+.inputs-row {
+    display: flex;
+    flex-direction: column;
+    gap: 20px;
+}
+
+.field-group {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+}
+
+input {
+    width: 100%;
+    padding: 12px;
+    font-size: 18px;
+    border-radius: 12px;
+    border: 2px dashed red;
+    background: transparent;
+    color: red;
+    outline: none;
+}
+
+input.error-input {
+    background: #ffd6d6;
+}
+
+.operation-select {
+    align-self: center;
+    padding: 10px 15px;
+    font-size: 18px;
+    border-radius: 12px;
+    border: 2px dashed red;
+    background: transparent;
+    color: red;
+    cursor: pointer;
+    width: 100px;
+}
+
+.error {
+    color: red;
+    font-size: 14px;
+    min-height: 18px;
+    margin-top: 4px;
+}
+
+.calculate-btn {
+    margin: 5px auto 5px auto;
+    display: block;
+    width: 200px;
+    padding: 12px;
+    font-size: 18px;
+    border-radius: 12px;
+    border: 2px dashed red;
+    background: transparent;
+    color: red;
+    cursor: pointer;
+}
+
+.results {
+    margin-top: 25px;
+    border-radius: 12px;
+    border: 2px dashed red;
+    padding: 15px;
+    min-height: 100px;
+    color: red;
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+    overflow: hidden;
+}
+
+.result-old {
+    opacity: 0.4;
+}
+
+.result-new {
+    font-weight: bold;
+}
+
+@media (min-width: 768px) {
+    .inputs-row {
+        flex-direction: row;
+        align-items: flex-start;
+    }
+
+    .operation-select {
+        align-self: flex-start;
+    }
+}