:root {
    color-scheme: dark;
    --bg: #0b1020;
    --bg-soft: #121a2d;
    --surface: #131d33;
    --surface-elevated: #1a2540;
    --surface-border: rgba(148, 163, 184, 0.24);
    --text: #e6edf8;
    --text-muted: #9aa8c3;
    --primary: #6d7dff;
    --primary-strong: #5a67f2;
    --success: #10b981;
    --danger: #ef4444;
    --shadow-soft: 0 14px 30px rgba(2, 6, 23, 0.35);
}

:root[data-theme="light"] {
    color-scheme: light;
    --bg: #f4f7ff;
    --bg-soft: #edf2ff;
    --surface: #ffffff;
    --surface-elevated: #f8faff;
    --surface-border: rgba(148, 163, 184, 0.35);
    --text: #1f2937;
    --text-muted: #64748b;
    --primary: #4f46e5;
    --primary-strong: #4338ca;
    --success: #059669;
    --danger: #dc2626;
    --shadow-soft: 0 12px 26px rgba(15, 23, 42, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Tajawal", "Cairo", "Inter", "Segoe UI", sans-serif;
    background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
    color: var(--text);
    direction: rtl;
    text-align: right;
}

.app-shell {
    width: min(1240px, 94vw);
    margin: 30px auto 60px;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 30px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--primary) 18%, transparent);
    border: 1px solid color-mix(in srgb, var(--primary) 36%, transparent);
}

h1 {
    margin: 0;
    font-size: clamp(1.2rem, 1rem + 0.9vw, 1.8rem);
    font-weight: 700;
}

.brand p {
    margin: 5px 0 0;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.theme-toggle {
    margin: 0;
    border: 1px solid var(--surface-border);
    background: var(--surface);
    color: var(--text);
    border-radius: 999px;
    padding: 9px 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.theme-toggle:hover {
    transform: translateY(-1px);
    border-color: var(--primary);
}

#exams {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
}

.exams-head {
    grid-column: 1 / -1;
    margin-bottom: 4px;
}

.exams-head h2 {
    margin: 0;
    font-size: clamp(1.05rem, 0.95rem + 0.7vw, 1.5rem);
}

.exams-head p {
    margin: 8px 0 0;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.exam-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
    border: 1px solid var(--surface-border);
    background: var(--surface);
    border-radius: 18px;
    box-shadow: var(--shadow-soft);
    padding: 18px;
    min-height: 235px;
    transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    animation: fadeUp 0.5s ease both;
    cursor: pointer;
}

.exam-card:hover {
    transform: translateY(-5px);
    border-color: color-mix(in srgb, var(--primary) 55%, var(--surface-border));
    box-shadow: 0 18px 32px rgba(79, 70, 229, 0.16);
}

.exam-card[aria-disabled="true"] {
    cursor: not-allowed;
    opacity: 0.88;
}

.exam-card:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.exam-card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.exam-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--primary) 15%, transparent);
    border: 1px solid color-mix(in srgb, var(--primary) 30%, transparent);
}

.exam-status {
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
}

.status-available {
    color: #ecfdf5;
    background: color-mix(in srgb, var(--success) 75%, #000 25%);
}

.status-ended {
    color: #fee2e2;
    background: color-mix(in srgb, var(--danger) 75%, #000 25%);
}

.status-coming {
    color: #e0e7ff;
    background: color-mix(in srgb, var(--primary) 55%, #000 45%);
}

.exam-card h3 {
    margin: 0;
    font-size: 1.03rem;
    line-height: 1.55;
}

.exam-subject {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.exam-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.exam-meta span {
    padding: 7px 10px;
    border-radius: 10px;
    border: 1px solid var(--surface-border);
    background: var(--surface-elevated);
    font-size: 0.8rem;
}

.exam-best-score {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.exam-best-score strong {
    color: var(--text);
}

.start-exam-btn {
    margin-top: auto;
    width: 100%;
    border: none;
    border-radius: 12px;
    background: linear-gradient(120deg, var(--primary), var(--primary-strong));
    color: #fff;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 11px 14px;
    cursor: pointer;
    transition: transform 0.2s ease, filter 0.2s ease;
}

.start-exam-btn:hover {
    transform: translateY(-1px);
    filter: brightness(1.06);
}

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

.question-box {
    display: none;
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: 16px;
    max-width: 620px;
    width: min(94vw, 620px);
    margin: 50px auto;
    padding: 24px;
    box-shadow: var(--shadow-soft);
    text-align: right;
}

#question {
    margin-bottom: 20px;
    font-size: 1.15rem;
}

.question-code-wrap {
    text-align: left;
    direction: ltr;
    background: color-mix(in srgb, var(--surface-elevated) 72%, #000 28%);
    border: 1px solid var(--surface-border);
    border-radius: 10px;
    padding: 14px 16px;
    margin: 0 0 16px;
    overflow-x: auto;
    font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text);
    white-space: pre;
}

.question-code-wrap code {
    font-family: inherit;
}

.answers {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.answers button {
    margin: 0;
    background: var(--surface-elevated);
    color: var(--text);
    border: 1px solid var(--surface-border);
    padding: 13px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
}

.answers button.code-answer {
    direction: ltr;
    text-align: left;
    font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
}

.answers button:hover {
    border-color: color-mix(in srgb, var(--primary) 55%, var(--surface-border));
}

.answers button.correct {
    background: color-mix(in srgb, var(--success) 20%, transparent);
    border-color: var(--success);
    color: var(--success);
}

.answers button.wrong {
    background: color-mix(in srgb, var(--danger) 18%, transparent);
    border-color: var(--danger);
    color: var(--danger);
}

button {
    margin-top: 18px;
    padding: 11px 16px;
    border: none;
    border-radius: 10px;
    background: var(--primary);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
}

button:hover {
    background: var(--primary-strong);
}

#result {
    margin: 45px auto;
    width: min(940px, 92vw);
}

#result div {
    background: var(--surface) !important;
    color: var(--text) !important;
    border: 1px solid var(--surface-border);
}

.back-home-btn {
    position: fixed;
    right: 22px;
    bottom: 22px;
    z-index: 1200;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 15px;
    border-radius: 999px;
    border: 1px solid var(--surface-border);
    background: linear-gradient(120deg, var(--surface), var(--surface-elevated));
    color: var(--text);
    font-weight: 700;
    box-shadow: var(--shadow-soft);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(14px) scale(0.98);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease, border-color 0.2s ease;
}

.back-home-btn.is-visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

.back-home-btn:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--primary) 60%, var(--surface-border));
}

.back-home-btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.back-home-icon {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--primary) 20%, transparent);
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .app-shell {
        margin-top: 20px;
    }

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

    .theme-toggle {
        align-self: flex-start;
    }

    #exams {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .exam-card {
        min-height: auto;
        padding: 16px;
    }

    .exam-meta span {
        flex: 1 1 100%;
    }

    .question-box {
        padding: 18px;
    }

    .back-home-btn {
        right: 14px;
        bottom: 14px;
        padding: 10px 14px;
        font-size: 0.9rem;
    }
}

@media (min-width: 769px) and (max-width: 1100px) {
    #exams {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}