/* =====================================================
   Imperial University College - Learning Platform
   Layout - Sidebar, Topbar, Page Structure
   ===================================================== */

/* =====================================================
   App Layout (Sidebar + Main)
   ===================================================== */

.app-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    min-height: 100vh;
    background-color: var(--c-bg);
}

/* =====================================================
   Sidebar
   ===================================================== */

.sidebar {
    background-color: var(--c-dark);
    color: var(--c-text-inverse);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: var(--z-sidebar);
    border-inline-end: 1px solid rgba(255, 255, 255, 0.06);
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

/* ---- Header / Logo ---- */

.sidebar__header {
    padding: var(--sp-5);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    flex-shrink: 0;
}

.sidebar__logo-mark {
    width: 38px;
    height: 38px;
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
    padding: 3px;
}

.sidebar__logo-mark img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.sidebar__logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
    overflow: hidden;
    min-width: 0;
}

.sidebar__logo-text strong {
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    color: var(--c-text-inverse);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar__logo-text span {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-family: var(--font-en);
    white-space: nowrap;
}

/* ---- Nav ---- */

.sidebar__nav {
    flex: 1;
    padding: var(--sp-4) var(--sp-3);
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
}

.sidebar__section {
    padding: var(--sp-4) var(--sp-3) var(--sp-2);
    font-size: 10px;
    font-weight: var(--fw-semibold);
    color: rgba(255, 255, 255, 0.35);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-family: var(--font-en);
}

.sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: 9px var(--sp-3);
    color: rgba(255, 255, 255, 0.65);
    border-radius: var(--r-md);
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    text-decoration: none;
    transition: all var(--t-fast);
    position: relative;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar__link svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.85;
}

.sidebar__link:hover {
    background-color: rgba(255, 255, 255, 0.06);
    color: var(--c-text-inverse);
}

.sidebar__link.is-active {
    background-color: var(--c-primary);
    color: var(--c-text-inverse);
}

.sidebar__link.is-active svg { opacity: 1; }

.sidebar__link-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}

.sidebar__link-badge {
    padding: 1px 7px;
    background-color: var(--c-error);
    color: var(--c-text-inverse);
    border-radius: var(--r-full);
    font-size: 10px;
    font-weight: var(--fw-bold);
    font-family: var(--font-en);
    line-height: 1.6;
    flex-shrink: 0;
}

/* ---- Footer / User ---- */

.sidebar__footer {
    padding: var(--sp-4);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    flex-shrink: 0;
}

.sidebar__user {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-2);
    border-radius: var(--r-md);
    background-color: rgba(255, 255, 255, 0.04);
    overflow: hidden;
}

.sidebar__user-avatar {
    width: 34px;
    height: 34px;
    background-color: var(--c-primary);
    color: var(--c-text-inverse);
    border-radius: var(--r-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--fw-semibold);
    font-size: var(--fs-xs);
    font-family: var(--font-en);
    flex-shrink: 0;
    letter-spacing: 0;
}

.sidebar__user-info {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.sidebar__user-name {
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    color: var(--c-text-inverse);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

.sidebar__user-role {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.5);
    font-family: var(--font-en);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    line-height: 1.3;
}

/* =====================================================
   Main Area
   ===================================================== */

.app-main {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 100vh;
}

/* =====================================================
   Topbar
   ===================================================== */

.topbar {
    background-color: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    padding: 0 var(--sp-6);
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-4);
    position: sticky;
    top: 0;
    z-index: var(--z-topbar);
    flex-shrink: 0;
}

.topbar__left,
.topbar__right {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    min-width: 0;
}

.topbar__menu-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--r-md);
    color: var(--c-text-secondary);
    background: none;
    border: none;
    cursor: pointer;
    transition: background-color var(--t-fast);
}

.topbar__menu-btn:hover {
    background-color: var(--c-slate-100);
    color: var(--c-text);
}

.topbar__menu-btn svg { width: 20px; height: 20px; }

.topbar__title {
    font-size: var(--fs-md);
    font-weight: var(--fw-semibold);
    color: var(--c-text);
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar__breadcrumb {
    font-size: var(--fs-xs);
    color: var(--c-text-tertiary);
    margin-top: 2px;
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.topbar__breadcrumb a {
    color: var(--c-primary);
    text-decoration: none;
}

.topbar__breadcrumb a:hover {
    text-decoration: underline;
}

.topbar__action {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: 0 var(--sp-3);
    height: 34px;
    background-color: var(--c-surface);
    color: var(--c-text-secondary);
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    font-family: var(--font-ar);
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--t-fast);
    white-space: nowrap;
    position: relative;
}

.topbar__action svg { width: 16px; height: 16px; }

.topbar__action:hover {
    background-color: var(--c-slate-50);
    border-color: var(--c-border-dark);
    color: var(--c-text);
}

.topbar__action--primary {
    background-color: var(--c-primary);
    border-color: var(--c-primary);
    color: var(--c-text-inverse);
}
.topbar__action--primary:hover {
    background-color: var(--c-primary-hover);
    border-color: var(--c-primary-hover);
    color: var(--c-text-inverse);
}

.topbar__action--icon {
    padding: 0;
    width: 34px;
    justify-content: center;
}

.topbar__action--icon svg { width: 18px; height: 18px; }

.topbar__action-badge {
    position: absolute;
    top: -4px;
    inset-inline-end: -4px;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    background-color: var(--c-error);
    color: var(--c-text-inverse);
    border-radius: var(--r-full);
    font-size: 10px;
    font-weight: var(--fw-bold);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-en);
    line-height: 1;
    border: 2px solid var(--c-surface);
}

/* =====================================================
   Content Area
   ===================================================== */

.app-content {
    padding: var(--content-padding);
    flex: 1;
    min-width: 0;
}

.page-header {
    margin-bottom: var(--sp-6);
}

.page-title {
    font-size: var(--fs-2xl);
    font-weight: var(--fw-bold);
    color: var(--c-text);
    margin-bottom: var(--sp-1);
    line-height: var(--lh-tight);
    letter-spacing: -0.02em;
}

.page-subtitle {
    font-size: var(--fs-sm);
    color: var(--c-text-secondary);
    line-height: var(--lh-relaxed);
}

.section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-4);
    margin-bottom: var(--sp-4);
    flex-wrap: wrap;
}

.section-title__text {
    font-size: var(--fs-lg);
    font-weight: var(--fw-semibold);
    color: var(--c-text);
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
}

.section-title__hint {
    font-size: var(--fs-xs);
    color: var(--c-text-tertiary);
}

/* =====================================================
   Stats Grid
   ===================================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--sp-4);
    margin-bottom: var(--sp-6);
}

@media (max-width: 1400px) {
    .stats-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 1024px) {
    .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 520px) {
    .stats-grid { grid-template-columns: 1fr; }
}

/* =====================================================
   Data Card (Table Card)
   ===================================================== */

.data-card {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    overflow: hidden;
    margin-bottom: var(--sp-6);
}

.data-card__header {
    padding: var(--sp-5) var(--sp-6);
    border-bottom: 1px solid var(--c-border-soft);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-4);
    flex-wrap: wrap;
}

.data-card__title {
    font-size: var(--fs-md);
    font-weight: var(--fw-semibold);
    color: var(--c-text);
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
}

.data-card__title-count {
    font-size: var(--fs-sm);
    color: var(--c-text-muted);
    font-weight: var(--fw-normal);
    font-family: var(--font-en);
}

/* =====================================================
   Filters Bar
   ===================================================== */

.filters-bar {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-4) var(--sp-6);
    border-bottom: 1px solid var(--c-border-soft);
    background-color: var(--c-surface-alt);
    flex-wrap: wrap;
}

.filters-bar__search {
    flex: 1;
    min-width: 200px;
    position: relative;
}

.filters-bar__search svg {
    position: absolute;
    top: 50%;
    inset-inline-start: var(--sp-3);
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--c-text-muted);
    pointer-events: none;
}

.filters-bar__search input {
    width: 100%;
    padding: 0 var(--sp-10) 0 var(--sp-3);
    height: 36px;
    border: 1px solid var(--c-border-dark);
    border-radius: var(--r-md);
    font-family: var(--font-ar);
    font-size: var(--fs-sm);
    background-color: var(--c-surface);
    transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.filters-bar__search input:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: var(--sh-focus);
}

.filters-bar__select {
    padding: 0 var(--sp-8) 0 var(--sp-3);
    height: 36px;
    border: 1px solid var(--c-border-dark);
    border-radius: var(--r-md);
    font-family: var(--font-ar);
    font-size: var(--fs-sm);
    background-color: var(--c-surface);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: left var(--sp-3) center;
    transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.filters-bar__select:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: var(--sh-focus);
}

/* =====================================================
   Bulk Actions Bar
   ===================================================== */

.bulk-actions {
    padding: var(--sp-3) var(--sp-6);
    background-color: var(--c-primary-light);
    border-bottom: 1px solid var(--c-primary-border);
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-4);
    flex-wrap: wrap;
}

.bulk-actions.is-visible { display: flex; }

.bulk-actions__info {
    font-size: var(--fs-sm);
    color: var(--c-primary);
    font-weight: var(--fw-medium);
}

.bulk-actions__buttons {
    display: flex;
    gap: var(--sp-2);
    flex-wrap: wrap;
}

/* =====================================================
   Sidebar Overlay (Mobile)
   ===================================================== */

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(15, 23, 42, 0.5);
    z-index: calc(var(--z-sidebar) - 1);
    backdrop-filter: blur(2px);
}

.sidebar-overlay.is-open { display: block; }

/* =====================================================
   Attention Grid (Dashboard)
   ===================================================== */

.attention-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-4);
    margin-bottom: var(--sp-6);
}

@media (max-width: 1024px) {
    .attention-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
    .attention-grid { grid-template-columns: 1fr; }
}

.attention-card {
    display: flex;
    align-items: center;
    gap: var(--sp-4);
    padding: var(--sp-5);
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    text-decoration: none;
    transition: all var(--t-base);
}

.attention-card:hover {
    border-color: var(--c-primary-border);
    box-shadow: var(--sh-md);
    transform: translateY(-2px);
}

.attention-card__icon {
    width: 42px;
    height: 42px;
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--c-slate-100);
    color: var(--c-text-secondary);
    flex-shrink: 0;
}

.attention-card__icon svg { width: 20px; height: 20px; }

.attention-card--warning .attention-card__icon {
    background-color: var(--c-warning-light);
    color: var(--c-warning);
}
.attention-card--error .attention-card__icon {
    background-color: var(--c-error-light);
    color: var(--c-error);
}
.attention-card--info .attention-card__icon {
    background-color: var(--c-primary-light);
    color: var(--c-primary);
}
.attention-card--success .attention-card__icon {
    background-color: var(--c-success-light);
    color: var(--c-success);
}

.attention-card__content { flex: 1; min-width: 0; }

.attention-card__value {
    font-size: var(--fs-2xl);
    font-weight: var(--fw-bold);
    color: var(--c-text);
    line-height: 1.1;
    font-family: var(--font-en);
    letter-spacing: -0.02em;
    margin-bottom: 2px;
}

.attention-card__label {
    font-size: var(--fs-xs);
    color: var(--c-text-secondary);
    line-height: 1.4;
}

/* =====================================================
   Welcome Hero
   ===================================================== */

.welcome-hero {
    background: linear-gradient(135deg, var(--c-dark) 0%, var(--c-primary) 100%);
    color: var(--c-text-inverse);
    border-radius: var(--r-xl);
    padding: var(--sp-8);
    margin-bottom: var(--sp-6);
    position: relative;
    overflow: hidden;
}

.welcome-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 85% 15%, rgba(255, 255, 255, 0.08) 0%, transparent 45%),
        radial-gradient(circle at 10% 90%, rgba(255, 255, 255, 0.06) 0%, transparent 45%);
    pointer-events: none;
}

.welcome-hero__content {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-6);
    flex-wrap: wrap;
}

.welcome-hero__title {
    color: var(--c-text-inverse);
    font-size: var(--fs-2xl);
    font-weight: var(--fw-bold);
    margin-bottom: var(--sp-2);
    letter-spacing: -0.02em;
    line-height: var(--lh-tight);
}

.welcome-hero__subtitle {
    color: rgba(255, 255, 255, 0.75);
    font-size: var(--fs-sm);
    line-height: var(--lh-relaxed);
}

.welcome-hero__badges {
    display: flex;
    gap: var(--sp-2);
    margin-top: var(--sp-4);
    flex-wrap: wrap;
}

.welcome-hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background-color: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--r-full);
    font-size: var(--fs-xs);
    font-weight: var(--fw-medium);
    color: var(--c-text-inverse);
    backdrop-filter: blur(4px);
}

.welcome-hero__badge svg { width: 14px; height: 14px; }

/* =====================================================
   Course Card
   ===================================================== */

.course-card {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    overflow: hidden;
    transition: all var(--t-base);
    display: flex;
    flex-direction: column;
    height: 100%;
    text-decoration: none;
    color: inherit;
}

.course-card:hover {
    border-color: var(--c-primary-border);
    box-shadow: var(--sh-md);
    transform: translateY(-3px);
    color: inherit;
}

.course-card__banner {
    height: 90px;
    background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    color: var(--c-text-inverse);
}

.course-card__banner svg {
    width: 32px;
    height: 32px;
    opacity: 0.9;
    stroke-width: 1.5;
}

.course-card__banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 70% 30%, rgba(255, 255, 255, 0.15) 0%, transparent 50%);
}

.course-card__body {
    padding: var(--sp-5);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-card__title {
    font-size: var(--fs-md);
    font-weight: var(--fw-semibold);
    color: var(--c-text);
    margin-bottom: var(--sp-2);
    line-height: 1.4;
    font-family: var(--font-en);
    direction: ltr;
    text-align: right;
    letter-spacing: -0.01em;
}

.course-card__description {
    font-size: var(--fs-sm);
    color: var(--c-text-tertiary);
    line-height: var(--lh-relaxed);
    margin-bottom: var(--sp-4);
    flex: 1;
}

.course-card__stats {
    display: flex;
    gap: var(--sp-3);
    margin-bottom: var(--sp-4);
    flex-wrap: wrap;
}

.course-card__stat {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: var(--fs-xs);
    color: var(--c-text-tertiary);
    font-family: var(--font-en);
}

.course-card__stat svg { width: 13px; height: 13px; }

.course-card__progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--fs-xs);
    color: var(--c-text-tertiary);
    margin-bottom: var(--sp-2);
}

.course-card__progress-header strong {
    color: var(--c-text);
    font-family: var(--font-en);
    font-weight: var(--fw-semibold);
}

/* =====================================================
   Courses Grid
   ===================================================== */

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--sp-5);
}

@media (max-width: 640px) {
    .courses-grid {
        grid-template-columns: 1fr;
    }
}

/* =====================================================
   Mini Stats (Student Dashboard)
   ===================================================== */

.mini-stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--sp-4);
    margin-bottom: var(--sp-6);
}

@media (max-width: 900px) {
    .mini-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 520px) {
    .mini-stats { grid-template-columns: 1fr; }
}

.mini-stat {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-4);
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
}

.mini-stat__icon {
    width: 38px;
    height: 38px;
    border-radius: var(--r-md);
    background-color: var(--c-primary-light);
    color: var(--c-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.mini-stat__icon svg { width: 18px; height: 18px; }

.mini-stat__icon--success {
    background-color: var(--c-success-light);
    color: var(--c-success);
}
.mini-stat__icon--warning {
    background-color: var(--c-warning-light);
    color: var(--c-warning);
}
.mini-stat__icon--error {
    background-color: var(--c-error-light);
    color: var(--c-error);
}

.mini-stat__content { min-width: 0; }

.mini-stat__value {
    font-size: var(--fs-lg);
    font-weight: var(--fw-bold);
    color: var(--c-text);
    font-family: var(--font-en);
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.mini-stat__label {
    font-size: var(--fs-xs);
    color: var(--c-text-tertiary);
    line-height: 1.3;
}

/* =====================================================
   Activity Feed
   ===================================================== */

.activity-feed {
    display: flex;
    flex-direction: column;
}

.activity-item {
    display: flex;
    align-items: flex-start;
    gap: var(--sp-3);
    padding: var(--sp-3) 0;
    border-bottom: 1px solid var(--c-border-soft);
}

.activity-item:last-child { border-bottom: none; }

.activity-item__icon {
    width: 32px;
    height: 32px;
    border-radius: var(--r-full);
    background-color: var(--c-slate-100);
    color: var(--c-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.activity-item__icon svg { width: 15px; height: 15px; }

.activity-item__icon--success {
    background-color: var(--c-success-light);
    color: var(--c-success);
}
.activity-item__icon--warning {
    background-color: var(--c-warning-light);
    color: var(--c-warning);
}
.activity-item__icon--error {
    background-color: var(--c-error-light);
    color: var(--c-error);
}

.activity-item__content { flex: 1; min-width: 0; }

.activity-item__text {
    font-size: var(--fs-sm);
    color: var(--c-text);
    line-height: var(--lh-relaxed);
}

.activity-item__text strong {
    font-weight: var(--fw-semibold);
}

.activity-item__time {
    font-size: var(--fs-xs);
    color: var(--c-text-muted);
    margin-top: 2px;
}