/*
    Author: Amey Thakur
    GitHub: https://github.com/Amey-Thakur
    Repository: https://github.com/Amey-Thakur/WEB-DESIGNING-LAB
    Description: CSS Styling for PHP Introduction (Experiment 6)
    Task: Layout and design system for the PHP Addition application.
*/

:root {
    /* Color Palette and UI Tokens */
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --bg-color: #f8f9fa;
    --text-color: #333;
    --card-bg: #ffffff;
    --border-radius: 8px;
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* Base Resets */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
}

/* Layout Containers */
.container {
    max-width: 800px;
    margin: 40px auto;
}

.main-header {
    text-align: center;
    margin-bottom: 40px;
}

.main-header h1 {
    color: #002dff;
    font-size: 2rem;
    margin-bottom: 10px;
}

.main-header h2 {
    color: #ff0000;
    font-size: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Student Information Table Styling */
.student-info {
    margin-bottom: 30px;
}

.id-table {
    width: 100%;
    background: var(--card-bg);
    border-collapse: collapse;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.id-table th,
.id-table td {
    padding: 15px;
    border: 1px solid #eee;
    text-align: left;
}

.id-table th {
    background-color: #f0f4f8;
    color: var(--primary-color);
    width: 20%;
}

/* Calculator Card Interface */
.calculator-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
}

.calculator-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.description {
    color: var(--secondary-color);
    margin-bottom: 30px;
}

/* Form Design */
.calc-form {
    max-width: 400px;
    margin: 0 auto;
    text-align: left;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Generic Button System */
.button-group {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.btn {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-submit {
    background-color: var(--primary-color);
    color: white;
}

.btn-submit:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

.btn-reset {
    background-color: #ff0000;
    color: white;
}

.btn-reset:hover {
    background-color: #cc0000;
    transform: translateY(-2px);
}

/* Global Footer */
.main-footer {
    text-align: center;
    margin-top: 50px;
    padding: 20px;
    color: #ff0000;
    font-weight: bold;
}