/* 1. استيراد الخط العربي */
@import url('https://fonts.googleapis.com/css2?family=Tajawal:wght@700;800&display=swap');

/* 2. إعدادات عامة */
:root {
    /* Color Hunt Palette: 000000 (black), 3E3636 (dark gray), D72323 (red), F5EDED (cream) */
    --color-bg: linear-gradient(140deg, #000000 0%, #3E3636 55%, #000000 100%);
    --color-surface: #000000;
    --color-surface-subtle: #3E3636;
    --color-border: rgba(245, 237, 237, 0.08);
    --color-border-strong: rgba(245, 237, 237, 0.16);
    --color-text-primary: #F5EDED;
    --color-text-secondary: rgba(245, 237, 237, 0.78);
    --color-text-muted: rgba(245, 237, 237, 0.52);
    /* Palette applied: D72323 (primary accent), darker red (strong accent), 3E3636 (alt accent) */
    --accent-main: #D72323;
    --accent-main-rgb: 215, 35, 35;
    --accent-strong: #A01010;
    --accent-strong-rgb: 160, 16, 16;
    --accent-alt: #3E3636;
    --color-accent: var(--accent-main);
    --color-accent-soft: rgba(var(--accent-main-rgb), 0.16);
    --color-accent-contrast: #ffffff;
    --color-warning: #f97316;
    --color-success: #16a34a;
    --color-danger: #dc2626;
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.08);
    --shadow-sm: 0 10px 30px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 20px 45px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 32px 65px rgba(0, 0, 0, 0.12);
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --transition-base: all 0.28s ease;
    --container-width: 1200px;
    --font-base: 'Tajawal', 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-highlight: rgba(255, 255, 255, 0.35);
    --glass-blur: 24px;
    --glass-bg-strong: rgba(0, 0, 0, 0.9);
    --glass-bg-soft: rgba(0, 0, 0, 0.75);
    --glass-shadow: 0 28px 60px rgba(0, 0, 0, 0.45);
}

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

html, body {
    height: 100%;
    width: 100%;
}

body {
    font-family: var(--font-base);
    background: var(--color-bg);
    min-height: 100vh;
    padding: 20px;
    color: var(--color-text-primary);
    -webkit-font-smoothing: antialiased;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

/* Header Styling */
.header {
    background: var(--color-surface);
    color: var(--color-text-primary);
    padding: 32px 24px;
    padding-top: 80px;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
    position: relative;
}

.header-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-surface);
    padding: 12px 20px;
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
}

.btn-back {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    background: var(--accent-main);
    color: var(--color-accent-contrast);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-base);
    font-size: 1rem;
    box-shadow: var(--shadow-xs);
}

.btn-back:hover {
    background: var(--accent-strong);
    box-shadow: 0 12px 24px rgba(var(--accent-main-rgb), 0.3);
    transform: translateY(-2px);
}

.btn-back:active {
    transform: translateY(0);
}

.logo {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-border);
    box-shadow: var(--shadow-xs);
    background: var(--color-surface-subtle);
    margin-bottom: 15px;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 800;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.6);
    letter-spacing: -0.01em;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 20px;
    color: var(--color-text-secondary);
}

/* Stats Display */
.stats {
    display: flex;
    justify-content: space-around;
    gap: 20px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.stat-box {
    background: var(--color-surface-subtle);
    padding: 15px 25px;
    border-radius: var(--radius-sm);
    text-align: center;
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
}

.stat-box .number {
    font-size: 2rem;
    font-weight: 800;
    display: block;
    color: var(--color-accent);
}

.stat-box .label {
    font-size: 0.9rem;
    opacity: 0.9;
    display: block;
    margin-top: 5px;
    color: var(--color-text-secondary);
}

/* Filters Section */
.filters {
    padding: 20px;
    background: var(--color-surface-subtle);
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
}

.filters label {
    font-weight: 700;
    color: var(--color-text-primary);
    white-space: nowrap;
}

.filters select {
    padding: 10px 15px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    cursor: pointer;
    background: var(--color-surface);
    color: var(--color-text-primary);
    font-family: var(--font-base);
    transition: var(--transition-base);
}

.filters select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 12px rgba(var(--accent-main-rgb), 0.3);
}

.search-box {
    flex: 1;
    min-width: 200px;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--color-surface);
    color: var(--color-text-primary);
    font-family: var(--font-base);
    transition: var(--transition-base);
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 12px rgba(var(--accent-main-rgb), 0.3);
}

/* Questions Container */
.questions-container {
    padding: 20px;
    min-height: 300px;
    background: var(--color-surface);
}

/* Question Card */
.question-card {
    background: var(--color-surface-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 20px;
    transition: var(--transition-base);
    display: none;
}

.question-card.show {
    display: block;
    animation: slideIn 0.3s ease;
}

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

.question-card:hover {
    box-shadow: var(--shadow-sm);
    border-color: var(--color-border-strong);
}

/* Category Badge */
.category-badge {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-accent-contrast);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 12px;
    text-transform: capitalize;
    border: 1px solid var(--color-border-strong);
}

/* Question Number */
.question-number {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 8px;
    font-weight: 700;
}

/* Question Text */
.question-text {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 20px;
    line-height: 1.6;
}

/* Options Container */
.options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.option {
    padding: 15px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-base);
    background: var(--color-surface);
    display: flex;
    align-items: center;
    color: var(--color-text-primary);
}

.option:hover {
    background: var(--color-surface-subtle);
    border-color: var(--color-accent);
    box-shadow: 0 4px 12px rgba(var(--accent-main-rgb), 0.2);
}

.option input[type="radio"] {
    margin-right: 12px;
    cursor: pointer;
    width: 18px;
    height: 18px;
    accent-color: var(--color-accent);
}

.option label {
    cursor: pointer;
    flex: 1;
    display: flex;
    align-items: center;
}

.option.selected {
    background: rgba(var(--accent-main-rgb), 0.12);
    border-color: var(--color-accent);
}

.option.correct {
    background: rgba(22, 163, 74, 0.12);
    border-color: var(--color-success);
    color: var(--color-success);
}

.option.incorrect {
    background: rgba(220, 38, 38, 0.12);
    border-color: var(--color-danger);
    color: var(--color-danger);
}

/* Reveal Button */
.reveal-btn {
    background: var(--color-accent);
    color: var(--color-accent-contrast);
    border: 1px solid transparent;
    padding: 12px 30px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
    transition: var(--transition-base);
    margin-bottom: 20px;
    font-family: var(--font-base);
}

.reveal-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(var(--accent-main-rgb), 0.3);
    background: var(--accent-strong);
    border: 2px solid #ffffff;
}

.reveal-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.reveal-btn.revealed {
    background: var(--color-success);
}

/* Explanation */
.explanation {
    background: rgba(var(--accent-main-rgb), 0.12);
    border-left: 4px solid var(--color-accent);
    padding: 15px;
    border-radius: var(--radius-sm);
    margin-top: 15px;
    display: none;
    animation: fadeIn 0.3s ease;
    color: var(--color-text-primary);
}

.explanation.show {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.explanation h4 {
    color: var(--color-accent);
    margin-bottom: 8px;
    font-weight: 700;
}

.explanation p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Correct Answer Mark */
.correct-answer-mark {
    display: inline-block;
    background: var(--color-success);
    color: white;
    padding: 3px 10px;
    border-radius: 3px;
    font-size: 0.75rem;
    margin-left: 10px;
    font-weight: 700;
    text-transform: uppercase;
}

/* No Results Message */
.no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

/* Controls Section */
.controls {
    padding: 20px;
    background: var(--color-surface-subtle);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--color-border);
}

/* Buttons */
.btn {
    padding: 11px 22px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 700;
    transition: var(--transition-base);
    font-size: 0.95rem;
    font-family: var(--font-base);
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-accent-contrast);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(var(--accent-main-rgb), 0.3);
    background: var(--accent-strong);
    border: 2px solid #ffffff;
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-surface-subtle);
    border-color: var(--color-accent);
}

/* Pagination/Results Count */
.pagination {
    padding: 20px;
    text-align: center;
    background: var(--color-surface-subtle);
    color: var(--color-text-secondary);
    font-weight: 700;
    border-top: 1px solid var(--color-border);
}

.pagination input {
    width: 70px;
    padding: 8px 12px;
    text-align: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    margin: 0 10px;
    background: var(--color-surface);
    color: var(--color-text-primary);
    font-family: var(--font-base);
}

/* Language Toggle */
.lang-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--color-accent);
    color: var(--color-accent-contrast);
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: var(--font-base);
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    transition: var(--transition-base);
    box-shadow: var(--shadow-xs);
    white-space: nowrap;
}

.lang-btn:hover {
    background: var(--accent-strong);
    box-shadow: 0 12px 24px rgba(var(--accent-main-rgb), 0.3);
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }

    .header p {
        font-size: 1rem;
    }

    .stats {
        flex-direction: column;
    }

    .stat-box {
        width: 100%;
    }

    .filters {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        min-width: 100%;
    }

    .filters select,
    .search-box input {
        width: 100%;
    }

    .controls {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        border-radius: var(--radius-md);
    }

    body {
        padding: 10px;
    }

    .header {
        padding: 20px 15px;
    }

    .header-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-back,
    .lang-btn {
        width: 100%;
    }

    .header h1 {
        font-size: 1.6rem;
    }

    .question-text {
        font-size: 1.05rem;
    }

    .option {
        padding: 12px;
    }

    .reveal-btn,
    .btn {
        padding: 10px 20px;
        font-size: 0.95rem;
    }
}

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

    .container {
        box-shadow: none;
        max-width: 100%;
    }

    .filters,
    .controls,
    .pagination,
    .reveal-btn {
        display: none;
    }

    .question-card {
        page-break-inside: avoid;
        border: 1px solid #ddd;
        margin-bottom: 15px;
    }

    .explanation {
        background: #f5f5f5;
        border-left: none;
    }
}

/* Scrollbar Styling (Chrome/Edge) */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-surface);
}

::-webkit-scrollbar-thumb {
    background: var(--color-accent);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-strong);
}

/* Form Focus States */
input:focus,
select:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(var(--accent-main-rgb), 0.2);
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Loading State */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Copyright Footer */
.copyright-footer {
    background: var(--color-surface-subtle);
    border-top: 1px solid var(--color-border-strong);
    padding: 1.5rem 2rem;
    margin-top: 3rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.copyright-footer p {
    margin: 0.5rem 0;
}

.copyright-footer p span {
    display: block;
}

@media (max-width: 768px) {
    .copyright-footer {
        padding: 1rem 1.5rem;
        font-size: 0.8rem;
    }
}