/* ============================================
   Dr. Dalal Al-Hitty's Educational Website
   University of Bahrain
   Unified Theme Stylesheet
   ============================================ */

/* CSS Variables for consistent theming */
:root {
    /* Primary Colors */
    --color-bg: #f8f9fa;
    --color-bg-dark: #f0f1f3;
    --color-white: #ffffff;

    /* Text Colors */
    --color-text-primary: #1a1a1a;
    --color-text-heading: #111827;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;

    /* Accent Colors */
    --color-accent: #3b82f6;
    --color-accent-dark: #2563eb;
    --color-accent-light: #60a5fa;

    /* Status Colors */
    --color-success: #28a745;
    --color-success-bg: #d4edda;
    --color-success-text: #155724;
    --color-error: #dc3545;
    --color-error-bg: #f8d7da;
    --color-error-text: #721c24;
    --color-warning: #ffc107;
    --color-info: #2196F3;
    --color-info-bg: #e3f2fd;
    --color-info-text: #0d47a1;

    /* Borders */
    --color-border: #e5e7eb;
    --color-border-hover: #d1d5db;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.12);

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 40px;
    --spacing-3xl: 60px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.3s ease;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 0.75em;
    --font-size-sm: 0.875em;
    --font-size-base: 1em;
    --font-size-lg: 1.125em;
    --font-size-xl: 1.375em;
    --font-size-2xl: 1.75em;
    --font-size-3xl: 2em;
    --font-size-4xl: 2.5em;
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    min-height: 100vh;
    padding: var(--spacing-2xl) var(--spacing-md);
    color: var(--color-text-primary);
    line-height: 1.6;
}

/* Subtle background pattern for visual interest */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(96, 165, 250, 0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
}

.container-narrow {
    max-width: 700px;
    margin: 0 auto;
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
}

/* Back Button */
.back-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--color-white);
    color: var(--color-accent);
    padding: 10px 24px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    transition: var(--transition-normal);
    border: 1px solid var(--color-border);
    font-size: 0.9375em;
}

.back-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-hover);
    color: var(--color-accent-dark);
}

.back-button::before {
    content: "←";
    font-size: 1.1em;
}

/* Header */
.header {
    margin-bottom: var(--spacing-3xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.header h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-text-heading);
    letter-spacing: -0.025em;
}

.header p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    font-weight: 400;
}

/* Cards Grid */
.cards-container,
.exercises {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

/* Card Styles */
.card,
.exercise-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) 28px;
    text-decoration: none;
    color: inherit;
    transition: var(--transition-normal);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.card::before,
.exercise-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-dark));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}

.card:hover::before,
.exercise-card:hover::before {
    transform: scaleX(1);
}

.card:hover,
.exercise-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-border-hover);
}

.card-title,
.exercise-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-heading);
    letter-spacing: -0.015em;
}

.card-description,
.exercise-card p {
    font-size: 0.9375em;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.card-arrow,
.start-btn {
    margin-top: var(--spacing-md);
    color: var(--color-accent);
    font-size: 1.25em;
    opacity: 0;
    transform: translateX(-8px);
    transition: var(--transition-normal);
}

.card:hover .card-arrow,
.exercise-card:hover .start-btn {
    opacity: 1;
    transform: translateX(0);
}

/* Exercise Icon */
.exercise-icon {
    font-size: 3em;
    margin-bottom: 15px;
}

/* Exercise Topics */
.exercise-topics {
    background: var(--color-bg);
    padding: 15px;
    border-radius: var(--radius-md);
    margin-top: 15px;
}

.exercise-topics strong {
    color: var(--color-text-heading);
    display: block;
    margin-bottom: 10px;
    font-size: 0.9375em;
}

.exercise-topics ul {
    text-align: left;
    margin-left: 20px;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.exercise-topics li {
    margin-bottom: 5px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-size: 1em;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
    color: var(--color-white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-accent);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.btn-lg {
    padding: 15px 32px;
    font-size: 1.125em;
}

.btn-block {
    width: 100%;
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    color: var(--color-text-secondary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: 1em;
    font-family: var(--font-family);
    transition: var(--transition-normal);
    background: var(--color-white);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Content Box */
.content-box {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

/* Info Box */
.info-box {
    background: var(--color-info-bg);
    border-left: 4px solid var(--color-info);
    padding: 15px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: var(--font-size-sm);
    color: var(--color-info-text);
    line-height: 1.6;
}

/* Result States */
.result-success {
    background: var(--color-success-bg);
    border: 2px solid var(--color-success);
    color: var(--color-success-text);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

.result-error {
    background: var(--color-error-bg);
    border: 2px solid var(--color-error);
    color: var(--color-error-text);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-5px);
    }
}

/* Apply fade-in animation to cards */
.card,
.exercise-card {
    animation: fadeIn 0.5s ease-out backwards;
}

.card:nth-child(1), .exercise-card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2), .exercise-card:nth-child(2) { animation-delay: 0.1s; }
.card:nth-child(3), .exercise-card:nth-child(3) { animation-delay: 0.15s; }
.card:nth-child(4), .exercise-card:nth-child(4) { animation-delay: 0.2s; }
.card:nth-child(5), .exercise-card:nth-child(5) { animation-delay: 0.25s; }
.card:nth-child(6), .exercise-card:nth-child(6) { animation-delay: 0.3s; }
.card:nth-child(7), .exercise-card:nth-child(7) { animation-delay: 0.35s; }
.card:nth-child(8), .exercise-card:nth-child(8) { animation-delay: 0.4s; }

/* Floating animation for icons */
.float-animation {
    animation: float 3s ease-in-out infinite;
}

/* Header with subtle parallax effect */
.header-parallax {
    position: relative;
    overflow: hidden;
}

.header-parallax::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
    animation: float 8s ease-in-out infinite;
    pointer-events: none;
}

/* Gradient text for special headings */
.gradient-text {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Divider */
.divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-2xl) 0;
}

/* Section Title */
.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

/* Badge */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-primary {
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-accent);
}

.badge-success {
    background: rgba(40, 167, 69, 0.1);
    color: var(--color-success);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .header h1 {
        font-size: var(--font-size-3xl);
    }

    .header p {
        font-size: var(--font-size-base);
    }

    .cards-container,
    .exercises {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .card,
    .exercise-card {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .content-box {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: var(--font-size-2xl);
    }

    .card-title,
    .exercise-card h3 {
        font-size: 1.25em;
    }

    .back-button {
        padding: 8px 16px;
        font-size: var(--font-size-sm);
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        padding: 0;
    }

    .back-button,
    .card-arrow,
    .start-btn {
        display: none;
    }

    .card,
    .exercise-card {
        box-shadow: none;
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles for Accessibility */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Selection Styles */
::selection {
    background: rgba(59, 130, 246, 0.2);
    color: var(--color-text-heading);
}