/* ==========================================================
   EELU Student Platform — نظام التصميم (تيل + كهرماني)
   الترتيب: 1 المتغيرات  2 الأساس  3 الشريط والتذييل  4 البطاقة والنماذج
            5 الصفحة الرئيسية  6 المواد والمحتوى  7 بلاغ المشكلة  8 التجاوب
   لتغيير الألوان عدّل المتغيرات في القسم 1 فقط.
   ========================================================== */

/* ---------- 1. المتغيرات ---------- */
:root {
    --font-ar: "IBM Plex Sans Arabic", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-en: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font: var(--font-ar);

    --fs-xs: 0.8125rem; --fs-sm: 0.925rem; --fs-md: 1.025rem; --fs-lg: 1.175rem; --fs-xl: 1.55rem;
    --lh: 1.68; --lh-heading: 1.35;

    --bg: #04121a;
    --text: #eaf4f6;
    --text-2: #b5cbd0;
    --text-muted: #8fa9b2;

    --accent: #2dd4bf;          /* تيل */
    --accent-strong: #14b8a6;
    --accent-soft: #65e6d5;
    --amber: #fbbf24;           /* كهرماني */
    --on-accent: #04121a;       /* لون النص فوق التيل */

    --gradient: linear-gradient(135deg, #14b8a6 0%, #2dd4bf 58%, #67e8d8 100%);
    --gradient-hover: linear-gradient(135deg, #0f9f91 0%, #14b8a6 58%, #2dd4bf 100%);
    --btn-shadow: 0 10px 28px rgba(20, 184, 166, 0.22), 0 0 20px rgba(45, 212, 191, 0.12);
    --btn-shadow-hover: 0 14px 32px rgba(20, 184, 166, 0.3), 0 0 24px rgba(45, 212, 191, 0.2);

    --nav-bg: rgba(4, 18, 26, 0.78);
    --card-bg: rgba(10, 31, 40, 0.68);
    --card-solid: #0b2029;
    --nav-solid: #061820;
    --input-bg: rgba(3, 18, 26, 0.62);
    --input-focus-bg: rgba(6, 29, 36, 0.94);
    --tile: rgba(255, 255, 255, 0.045);
    --tile-hover: rgba(45, 212, 191, 0.09);

    --border: rgba(178, 222, 224, 0.13);
    --border-glow: rgba(45, 212, 191, 0.42);
    --highlight: rgba(234, 244, 246, 0.22);
    --bevel: inset 0 1px 0 rgba(234, 244, 246, 0.12), inset 0 -1px 2px rgba(0, 0, 0, 0.28);
    --field-border: rgba(143, 169, 178, 0.3);
    --focus-ring: rgba(45, 212, 191, 0.24);

    --error-bg: rgba(239, 68, 68, 0.14);
    --error-border: rgba(248, 113, 113, 0.4);
    --error-text: #fca5a5;
    --amber-text: #fbbf24;
    --success: #34d399;

    --orb-1: rgba(45, 212, 191, 0.17); --orb-2: rgba(20, 130, 142, 0.15);
    --orb-3: rgba(251, 191, 36, 0.08); --orb-4: rgba(45, 212, 191, 0.08);
    --dots: rgba(234, 244, 246, 0.08);
    --shadow: 0 28px 72px rgba(0, 0, 0, 0.38), 0 8px 28px rgba(0, 0, 0, 0.16);

    --r-sm: 12px; --r-md: 16px; --r-lg: 20px; --r-xl: 28px;
    --tap: 2.9rem;
    --card-max: 535px;
    --card-wide: 1080px;
    --blur: 18px;
    color-scheme: dark;
}

:root[data-theme="light"] {
    --bg: #edf5f4;
    --text: #123039;
    --text-2: #36535b;
    --text-muted: #4f6b72;
    --accent: #0f9f91;
    --accent-strong: #0b8278;
    --accent-soft: #2dd4bf;
    --amber-text: #8a5b00;
    --gradient: linear-gradient(135deg, #0f9f91 0%, #14b8a6 58%, #2dd4bf 100%);
    --gradient-hover: linear-gradient(135deg, #0b8278 0%, #0f9f91 58%, #14b8a6 100%);
    --btn-shadow: 0 9px 22px rgba(15, 159, 145, 0.2);
    --btn-shadow-hover: 0 12px 26px rgba(15, 159, 145, 0.26);
    --nav-bg: rgba(244, 250, 249, 0.82);
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-solid: #ffffff;
    --nav-solid: #f6fbfa;
    --input-bg: rgba(255, 255, 255, 0.74);
    --input-focus-bg: #ffffff;
    --tile: rgba(255, 255, 255, 0.58);
    --tile-hover: rgba(45, 212, 191, 0.12);
    --border: rgba(38, 92, 98, 0.14);
    --border-glow: rgba(15, 159, 145, 0.38);
    --highlight: rgba(255, 255, 255, 0.92);
    --bevel: inset 0 1px 0 rgba(255, 255, 255, 0.78);
    --field-border: rgba(63, 105, 111, 0.24);
    --focus-ring: rgba(15, 159, 145, 0.18);
    --error-bg: rgba(239, 68, 68, 0.08);
    --error-border: rgba(239, 68, 68, 0.32);
    --error-text: #b91c1c;
    --success: #059669;
    --orb-1: rgba(45, 212, 191, 0.17); --orb-2: rgba(98, 187, 181, 0.15);
    --orb-3: rgba(251, 191, 36, 0.1); --orb-4: rgba(45, 212, 191, 0.1);
    --dots: rgba(15, 159, 145, 0.1);
    --shadow: 0 24px 56px rgba(20, 62, 66, 0.12), 0 5px 18px rgba(20, 62, 66, 0.06);
    color-scheme: light;
}

:root[lang="en"] { --font: var(--font-en); --lh: 1.58; --lh-heading: 1.28; }

/* ---------- 2. الأساس ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-x: hidden;
    line-height: var(--lh);
    -webkit-user-select: none;
    user-select: none;
}
input, textarea { -webkit-user-select: text; user-select: text; }

/* خلفية الأورورا + الشبكة النقطية */
body::before, body::after { content: ""; position: fixed; inset: 0; pointer-events: none; }
body::before {
    z-index: -2;
    background:
        radial-gradient(55rem 40rem at 10% -5%, var(--orb-1), transparent 65%),
        radial-gradient(50rem 38rem at 92% 12%, var(--orb-2), transparent 62%),
        radial-gradient(45rem 36rem at 50% 105%, var(--orb-3), transparent 65%),
        radial-gradient(38rem 30rem at 85% 85%, var(--orb-4), transparent 60%);
    opacity: 0.82;
    animation: float 30s ease-in-out infinite alternate;
}
body::after {
    z-index: -1;
    background-image: radial-gradient(var(--dots) 1px, transparent 1px);
    background-size: 34px 34px;
    opacity: 0.3;
}
@keyframes float { to { transform: scale(1.06) translateY(-22px); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(12px); } }
@keyframes spin { to { transform: rotate(360deg); } }

.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
a { color: inherit; }

/* الصفحة تُخفى لحظة قصيرة حتى تُترجم للعربية (يضبطها boot.js) */
html.i18n-pending body { visibility: hidden; }

/* تفاعلات الحركة الصغيرة */
button, a, input, textarea {
    transition: transform 160ms ease, border-color 200ms ease, background-color 200ms ease, box-shadow 200ms ease, color 200ms ease;
}
/* تبديل المظهر: انتقال ناعم يُفعَّل لحظة التبديل فقط */
html.theme-anim *, html.theme-anim *::before, html.theme-anim *::after {
    transition: background-color 0.28s ease, color 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease, fill 0.28s ease;
}

/* ---------- 3. الشريط العلوي والتذييل ---------- */
.navbar {
    position: sticky; top: 0; z-index: 50;
    display: flex; justify-content: space-between; align-items: center; gap: 1rem;
    padding: 0.95rem 2.2rem;
    background: var(--nav-bg);
    backdrop-filter: blur(14px) saturate(160%);
    -webkit-backdrop-filter: blur(14px) saturate(160%);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.14);
}
.brand { display: flex; align-items: center; gap: 1rem; min-width: 0; text-decoration: none; color: inherit; }
.brand:hover .logo-text, .brand:focus-visible .logo-text { color: var(--accent); }
.brand:focus-visible { outline-offset: 4px; border-radius: var(--r-sm); }
.logo-badge {
    flex-shrink: 0;
    background: linear-gradient(135deg, #0f9f91, #2dd4bf);
    color: var(--on-accent);
    font-family: var(--font-en); font-weight: 800; font-size: var(--fs-xs);
    letter-spacing: 0.12em; text-transform: uppercase;
    padding: 0.42rem 0.85rem;
    border-radius: var(--r-sm);
    border: 1px solid rgba(234, 244, 246, 0.28);
    box-shadow: 0 5px 18px rgba(45, 212, 191, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.48);
}
.logo-badge--sm { font-size: 0.72rem; padding: 0.32rem 0.65rem; }
.logo-text { font-weight: 700; font-size: 1.05rem; line-height: 1.4; overflow-wrap: anywhere; letter-spacing: -0.015em; }

.nav-controls { display: flex; gap: 0.65rem; flex-shrink: 0; }
.btn-icon {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: var(--tap); height: var(--tap); padding: 0 0.9rem;
    background: var(--tile); color: var(--text);
    border: 1px solid var(--border); border-radius: var(--r-sm);
    font-family: inherit; font-size: var(--fs-sm); font-weight: 700; line-height: 1.2;
    text-decoration: none; white-space: nowrap; cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 4px 12px rgba(0, 0, 0, 0.06);
}
.btn-icon:hover { color: var(--accent); border-color: var(--accent); background: var(--tile-hover); transform: translateY(-2px); box-shadow: 0 7px 20px rgba(45, 212, 191, 0.14); }
.btn-icon:active { transform: translateY(0); }
.home-link { width: var(--tap); padding: 0; }
.home-link svg { width: 20px; height: 20px; }

.site-footer {
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: space-between; gap: 1rem 1.5rem;
    padding: 0.7rem clamp(1rem, 4vw, 2.2rem);
    background: var(--nav-bg);
    border-top: 1px solid var(--border);
    backdrop-filter: blur(14px) saturate(145%);
    -webkit-backdrop-filter: blur(14px) saturate(145%);
}
.footer-university { color: var(--text-2); font-size: var(--fs-xs); font-weight: 600; }
.footer-meta { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 0.35rem 0.65rem; color: var(--text-muted); font-size: 0.78rem; }
.footer-author { color: var(--accent); text-decoration: none; }
.footer-author:hover { color: var(--amber-text); }
.footer-divider { color: var(--amber-text); }

/* ---------- 4. البطاقة والنماذج ---------- */
.main { flex: 1; display: flex; justify-content: center; align-items: center; padding: 2.25rem 1rem; position: relative; z-index: 1; }

.card {
    position: relative; overflow: hidden;
    width: 100%; max-width: var(--card-max);
    padding: 2.5rem 2.25rem;
    text-align: center;
    background: linear-gradient(145deg, rgba(234, 244, 246, 0.075), rgba(234, 244, 246, 0.012)), var(--card-bg);
    border: 1px solid var(--border);
    border-top-color: var(--highlight);
    border-inline-start-color: var(--highlight);
    border-radius: var(--r-xl);
    box-shadow: var(--shadow), var(--bevel);
    backdrop-filter: blur(var(--blur)) saturate(150%);
    -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
}
.card--wide { max-width: var(--card-wide); }

.icon-wrapper {
    width: 74px; height: 74px; margin: 0 auto 1.35rem;
    display: flex; align-items: center; justify-content: center;
    color: var(--accent);
    background: linear-gradient(145deg, rgba(45, 212, 191, 0.18), rgba(45, 212, 191, 0.045));
    border: 1px solid rgba(45, 212, 191, 0.26);
    border-radius: 50%;
    box-shadow: 0 10px 26px rgba(45, 212, 191, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.23);
}
.card-title { font-size: var(--fs-xl); font-weight: 800; line-height: var(--lh-heading); margin-bottom: 0.6rem; letter-spacing: -0.02em; }
.card-subtitle { font-size: var(--fs-lg); font-weight: 700; margin-bottom: 0.3rem; }
.lead { color: var(--text-2); font-size: var(--fs-sm); font-weight: 500; line-height: var(--lh); margin-bottom: 1.85rem; }

.field { display: flex; flex-direction: column; gap: 0.55rem; text-align: start; }
.field-label { font-size: var(--fs-sm); font-weight: 600; color: var(--text-2); }
.field input, .field textarea {
    width: 100%; min-height: var(--tap);
    padding: 1rem 1.4rem;
    background: var(--input-bg); color: var(--text);
    border: 1.5px solid var(--field-border); border-radius: var(--r-md);
    font-family: var(--font-en); font-size: var(--fs-lg); font-weight: 600;
    text-align: center; letter-spacing: 0.16em;
    outline: none;
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.12);
}
.field input::placeholder { color: var(--text-muted); letter-spacing: 0; font-family: var(--font); font-weight: 400; font-size: var(--fs-sm); opacity: 0.85; }
.field input:focus, .field textarea:focus { background: var(--input-focus-bg); border-color: var(--accent); box-shadow: 0 0 0 4px var(--focus-ring), 0 8px 22px rgba(45, 212, 191, 0.1); }
.field input[aria-invalid="true"] { border-color: #ef4444; box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.25); }
.field input:disabled { opacity: 0.62; cursor: not-allowed; }
.field-hint { color: var(--text-muted); font-size: 0.75rem; text-align: end; }

.btn-primary {
    width: 100%; min-height: var(--tap); padding: 1rem 1.6rem;
    display: flex; align-items: center; justify-content: center;
    background: var(--gradient); color: var(--on-accent);
    border: 1px solid rgba(234, 244, 246, 0.36); border-radius: var(--r-md);
    font-family: inherit; font-size: var(--fs-md); font-weight: 700; line-height: 1.3;
    text-decoration: none; cursor: pointer;
    box-shadow: var(--btn-shadow);
}
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); background: var(--gradient-hover); box-shadow: var(--btn-shadow-hover); }
.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.72; cursor: not-allowed; filter: saturate(0.55); }
.btn-primary[aria-busy="true"] { cursor: progress; filter: none; opacity: 0.8; }
.btn-primary[aria-busy="true"]::after {
    content: ""; width: 1.2em; height: 1.2em; margin-inline-start: 0.65rem;
    border: 2.5px solid rgba(4, 18, 26, 0.3); border-top-color: var(--on-accent); border-radius: 50%;
    animation: spin 0.75s linear infinite;
}

.error-box {
    margin-top: 1.5rem; padding: 1rem 1.35rem;
    background: var(--error-bg); border: 1px solid var(--error-border); color: var(--error-text);
    border-radius: var(--r-md); font-size: var(--fs-sm); text-align: start;
}

.toast {
    position: fixed; inset-inline: 1rem; bottom: 1rem; z-index: 100;
    width: fit-content; max-width: min(34rem, calc(100vw - 2rem)); margin-inline: auto;
    padding: 0.8rem 1.1rem;
    background: var(--card-solid); color: var(--text);
    border: 1px solid var(--border); border-radius: var(--r-md);
    box-shadow: var(--shadow); text-align: center;
    opacity: 0; visibility: hidden; transform: translateY(0.5rem);
}
.toast.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }

/* ---------- 5. الصفحة الرئيسية ---------- */
.search-form { display: flex; flex-direction: column; gap: 1.5rem; }
.home-title { font-size: var(--fs-xl); }
:root[lang="ar"] .home-title { font-size: clamp(0.58rem, 3vw, 1.1rem); white-space: nowrap; letter-spacing: -0.04em; }

.platform-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; width: 100%; }
.btn-platform {
    min-width: 0; min-height: var(--tap);
    display: flex; align-items: center; justify-content: center; gap: 0.5rem;
    padding: 0.75rem 0.65rem;
    background: var(--gradient); color: var(--on-accent);
    border: 1px solid rgba(45, 212, 191, 0.72); border-radius: var(--r-md);
    font-size: var(--fs-xs); font-weight: 700; line-height: 1.35; text-align: center; text-decoration: none;
    box-shadow: 0 6px 18px rgba(15, 159, 145, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.32);
}
.btn-platform span { overflow-wrap: anywhere; }
.btn-platform:hover, .btn-platform:focus-visible {
    background: linear-gradient(135deg, #14b8a6 0%, #2dd4bf 100%);
    border-color: var(--accent-soft); transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(15, 159, 145, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.42);
}
.btn-platform:active { transform: translateY(0) scale(0.98); }
.btn-courses {
    grid-column: 1 / -1; padding: 0.95rem 1.35rem; font-size: var(--fs-md);
    color: var(--text);
    background: linear-gradient(135deg, rgba(45, 212, 191, 0.14), rgba(251, 191, 36, 0.07)), var(--tile);
    border: 1.5px solid rgba(45, 212, 191, 0.32);
    box-shadow: none;
}
.btn-courses:hover, .btn-courses:focus-visible {
    color: var(--text);
    background: linear-gradient(135deg, rgba(45, 212, 191, 0.25), rgba(251, 191, 36, 0.12));
    border-color: var(--accent);
    box-shadow: 0 10px 26px rgba(45, 212, 191, 0.16);
}

.result { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border); text-align: start; animation: fadeIn 0.4s ease; }
.result:focus { outline: none; }
.result-title { font-size: var(--fs-lg); font-weight: 700; margin-bottom: 1.5rem; color: var(--accent); text-align: center; }
.info-grid { display: flex; flex-direction: column; gap: 0.7rem; }
.info-item {
    display: flex; justify-content: space-between; align-items: center; gap: 1rem;
    padding: 0.9rem 1.25rem;
    background: var(--input-bg); border: 1px solid var(--border); border-radius: var(--r-md);
}
.info-item:hover { border-color: var(--border-glow); background: var(--tile-hover); }
.info-label { font-size: var(--fs-sm); font-weight: 500; color: var(--text-muted); flex-shrink: 0; }
.info-value { min-width: 0; font-size: var(--fs-sm); font-weight: 700; text-align: end; overflow-wrap: anywhere; }
.info-value.num { font-family: var(--font-en); font-weight: 600; direction: ltr; unicode-bidi: isolate; letter-spacing: 0.04em; color: var(--accent); }

/* ---------- 6. المواد والمحتوى ---------- */
.page-nav { display: flex; align-items: stretch; gap: 0.75rem; margin-bottom: 1.45rem; }
.back-btn {
    flex-shrink: 0; width: var(--tap);
    display: flex; align-items: center; justify-content: center;
    background: var(--tile); color: var(--text);
    border: 1px solid var(--border); border-radius: var(--r-md); text-decoration: none;
}
.back-btn svg { width: 1.35rem; height: 1.35rem; }
.back-btn:hover { color: var(--accent); border-color: var(--accent); background: var(--tile-hover); transform: translateY(-2px); box-shadow: 0 6px 18px rgba(45, 212, 191, 0.14); }
[dir="ltr"] .back-btn svg { transform: scaleX(-1); }

.page-name {
    flex: 1; min-width: 0; min-height: var(--tap);
    display: flex; align-items: center; gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background: var(--tile); border: 1px solid var(--border); border-radius: var(--r-md);
    font-size: var(--fs-md); font-weight: 700; text-align: start;
}
.page-icon { display: inline-grid; place-items: center; flex: 0 0 1.5rem; width: 1.5rem; height: 1.5rem; color: var(--accent); }
.page-icon svg { width: 1.45rem; height: 1.45rem; }
.page-name span:last-child { overflow-wrap: anywhere; }
.page-nav + .card-header .lead { margin-bottom: 1.45rem; }
.card-header + .course-grid { margin-top: 0.5rem; }

/* قائمة المواد وأقسام المادة */
.course-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.85rem; }
.course-grid--types { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.course-item {
    min-width: 0; min-height: 92px;
    display: flex; align-items: center; gap: 0.9rem; padding: 0.75rem;
    color: var(--text); text-decoration: none; text-align: start;
    background: linear-gradient(135deg, rgba(234, 244, 246, 0.055), rgba(234, 244, 246, 0.015)), var(--tile);
    border: 1px solid var(--border); border-radius: var(--r-md);
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(234, 244, 246, 0.1);
}
.course-box {
    flex: 0 0 58px; width: 58px; height: 58px;
    display: grid; place-items: center;
    color: var(--accent);
    background: rgba(45, 212, 191, 0.09);
    border: 1px solid rgba(45, 212, 191, 0.3); border-radius: 17px;
}
.course-box svg { width: 31px; height: 31px; }
.course-name { flex: 1; min-width: 0; font-size: var(--fs-sm); font-weight: 600; overflow-wrap: break-word; }
.course-item:nth-child(even) .course-box { color: var(--amber-text); background: rgba(251, 191, 36, 0.08); border-color: rgba(251, 191, 36, 0.32); }
.course-item:hover, .course-item:focus-visible { border-color: var(--border-glow); background: var(--tile-hover); transform: translateY(-2px); }
.course-item:hover .course-box, .course-item:focus-visible .course-box { background: rgba(45, 212, 191, 0.13); border-color: rgba(45, 212, 191, 0.56); box-shadow: 0 6px 18px rgba(45, 212, 191, 0.12); }
.course-item:nth-child(even):hover .course-box, .course-item:nth-child(even):focus-visible .course-box { background: rgba(251, 191, 36, 0.13); border-color: rgba(251, 191, 36, 0.58); box-shadow: 0 6px 18px rgba(251, 191, 36, 0.1); }

/* بطاقات المحتوى والمحاضرات */
.resource-grid, .lecture-grid {
    display: grid; justify-content: center; gap: 0.7rem;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 180px));
}
.resource-item, .lecture-card {
    width: 100%; max-width: 180px; aspect-ratio: 1.25; min-width: 0;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    background: linear-gradient(145deg, rgba(234, 244, 246, 0.06), rgba(234, 244, 246, 0.015)), var(--tile);
    border: 1px solid var(--border); border-radius: var(--r-md);
    box-shadow: inset 0 1px 0 rgba(234, 244, 246, 0.1), 0 8px 20px rgba(0, 0, 0, 0.08);
    text-align: center;
}
.resource-item { gap: 0.42rem; padding: 0.7rem; color: var(--text); text-decoration: none; font: inherit; cursor: pointer; }
.resource-item:hover, .resource-item:focus-visible { transform: translateY(-3px); border-color: var(--border-glow); background: var(--tile-hover); box-shadow: 0 12px 28px rgba(45, 212, 191, 0.11); }
.resource-icon { width: 2rem; height: 2rem; display: grid; place-items: center; color: var(--accent); background: rgba(45, 212, 191, 0.08); border: 1px solid rgba(45, 212, 191, 0.25); border-radius: 11px; }
.resource-icon svg { width: 1rem; height: 1rem; }
.resource-name { font-weight: 700; overflow-wrap: anywhere; }
.resource-hint { color: var(--text-muted); font-size: 0.72rem; }

.lecture-card { gap: 0.5rem; padding: 0.65rem; align-items: stretch; }
.lecture-card h3 { font-size: 0.95rem; font-weight: 700; }
.lecture-actions { display: grid; gap: 0.4rem; }
.lecture-link {
    min-height: 2.15rem; display: flex; align-items: center; justify-content: center;
    padding: 0.38rem 0.45rem;
    background: var(--tile); color: var(--accent);
    border: 1px solid var(--border); border-radius: var(--r-sm);
    font-family: inherit; font-size: 0.75rem; font-weight: 700; line-height: 1.3; text-decoration: none; cursor: pointer;
}
.lecture-link + .lecture-link { color: var(--amber-text); }
.lecture-link:hover, .lecture-link:focus-visible { border-color: var(--border-glow); background: var(--tile-hover); transform: translateY(-1px); }
.is-empty { opacity: 0.8; }

.notfound .lead { margin-bottom: 1.5rem; }
.notfound .btn-primary { width: auto; display: inline-flex; }

/* ---------- 7. بلاغ المشكلة ---------- */
.issue-card { max-width: 720px; padding: 1.15rem 1.6rem; }
.issue-card .icon-wrapper { width: 42px; height: 42px; margin-bottom: 0.3rem; font-size: 1.35rem; }
.issue-card .card-title { font-size: clamp(1.3rem, 2.5vh, 1.65rem); margin-bottom: 0.25rem; }
.issue-card .lead { margin-bottom: 0.7rem; }
.issue-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.55rem 1rem; }
.issue-form .field { gap: 0.25rem; }
.field--full { grid-column: 1 / -1; }
.issue-form .field-label { font-size: var(--fs-xs); }
.issue-form .field input, .issue-form .field textarea {
    min-height: 2.35rem; padding: 0.45rem 0.75rem;
    font: 500 0.95rem/1.4 var(--font); text-align: start; letter-spacing: normal;
}
.issue-form .field textarea { min-height: 5rem; max-height: 8rem; resize: vertical; }
.issue-form .btn-primary { grid-column: 1 / -1; min-height: 2.5rem; padding: 0.55rem 1rem; }
.form-status { grid-column: 1 / -1; min-height: 1.2em; font-size: var(--fs-xs); }
.form-status[data-kind="error"] { color: var(--error-text); }
.form-status[data-kind="success"] { color: var(--success); }
.honeypot { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); }

/* ---------- 8. التجاوب ---------- */
@media (min-width: 768px) { :root { --card-max: 565px; } }
@media (min-width: 1600px) { html { font-size: 18px; } :root { --card-max: 650px; --card-wide: 1060px; } }

/* شاشات سطح المكتب: كثافة أعلى لتقليل التمرير */
@media (min-width: 769px) {
    .navbar { padding-block: 0.55rem; }
    .main { padding: clamp(0.75rem, 2vh, 1.5rem) 1.5rem; }
    .card { padding: clamp(1.25rem, 3vh, 2rem) clamp(1.5rem, 3vw, 2.25rem); }
    .icon-wrapper { width: 56px; height: 56px; margin-bottom: 0.65rem; }
    .lead { margin-bottom: 1rem; }
    .search-form { gap: 0.85rem; }
    .field { gap: 0.35rem; }
    .field input, .btn-primary { min-height: 2.65rem; padding-block: 0.65rem; }
    .platform-grid { gap: 0.55rem; }
    .btn-platform { min-height: 2.5rem; padding-block: 0.55rem; }
    .info-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.45rem; }
    .info-item { padding: 0.55rem 0.75rem; gap: 0.5rem; }
    .page-nav { margin-bottom: 0.8rem; }
    .course-grid { gap: 0.8rem; }
}
@media (max-height: 760px) and (min-width: 769px) {
    .navbar { padding-block: 0.4rem; }
    .main { padding-block: 0.5rem; }
    .card { padding-block: 1rem; }
    .page-name { min-height: 2.5rem; padding-block: 0.45rem; }
}
@media (max-height: 720px) and (min-width: 561px) {
    .issue-card { padding-block: 0.65rem; }
    .issue-card .icon-wrapper { display: none; }
    .issue-card .lead { margin-bottom: 0.35rem; }
    .issue-form .field textarea { min-height: 3.5rem; }
}

@media (max-width: 768px) {
    .main { padding-block: 1.25rem; }
    .card { padding: 1.5rem 1.25rem; }
}
@media (max-width: 760px) {
    .course-grid--types { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .site-footer { flex-direction: column; justify-content: center; text-align: center; gap: 0.35rem; padding-block: 0.55rem; }
    .footer-meta { justify-content: center; text-align: center; }
}
@media (max-width: 760px) {
    /* أقسام المادة: الأيقونة فوق النص حتى لا تنكسر الكلمات */
    .course-grid--types .course-item { flex-direction: column; justify-content: center; text-align: center; padding: 0.9rem 0.5rem; }
    .course-grid--types .course-name { flex: none; text-align: center; }
}
@media (max-width: 620px) {
    .course-grid:not(.course-grid--types) { grid-template-columns: 1fr; }
    .course-item { min-height: 80px; }
}
@media (max-width: 560px) {
    .issue-card { padding: 1.4rem 1rem; }
    .issue-form { grid-template-columns: 1fr; }
}
@media (max-width: 540px) {
    :root { --r-xl: 24px; }
    .logo-text, .footer-university { display: none; }
    .navbar { padding: 0.8rem 1.1rem; gap: 0.5rem; }
    .card-title { font-size: 1.3rem; }
    .info-item { flex-direction: column; align-items: stretch; gap: 0.28rem; }
    .info-value { text-align: start; }
}
@media (max-width: 400px) {
    .btn-platform:not(.btn-courses) { flex-direction: column; gap: 0.35rem; font-size: 0.74rem; padding: 0.55rem 0.3rem; }
    .logo-badge { font-size: 0.75rem; padding: 0.32rem 0.58rem; }
    .brand { gap: 0.55rem; }
}
@media (max-width: 380px) {
    .course-grid--types { grid-template-columns: 1fr; }
    .resource-grid, .lecture-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .resource-item, .lecture-card { max-width: none; }
}
@media (max-width: 360px) {
    .main { padding: 1.25rem 0.75rem; }
    .btn-icon { padding: 0 0.55rem; }
}

/* الأجهزة الصغيرة واللمس: نفس الهوية بدون تأثيرات مكلفة */
@media (max-width: 760px), (pointer: coarse) {
    body::before { animation: none; }
    .card, .navbar, .site-footer { -webkit-backdrop-filter: none; backdrop-filter: none; }
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .card { background: var(--card-solid); }
    .navbar, .site-footer { background: var(--nav-solid); }
}
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; }
}