:root {
    --bg: #f8f9fa;
    --panel: #ffffff;
    --surface: #f1f3f5;
    --surface-2: #e9ecef;
    --surface-3: #dee2e6;
    --border: rgba(15, 23, 42, 0.08);
    --border-md: rgba(15, 23, 42, 0.14);
    --border-hover: rgba(15, 23, 42, 0.22);
    --accent: #0f172a;
    --blue: #3b82f6;
    --blue-dim: rgba(59, 130, 246, 0.12);
    --blue-border: rgba(59, 130, 246, 0.25);
    --green: #10b981;
    --green-dim: rgba(16, 185, 129, 0.12);
    --green-border: rgba(16, 185, 129, 0.25);
    --amber: #f59e0b;
    --amber-dim: rgba(245, 158, 11, 0.12);
    --amber-border: rgba(245, 158, 11, 0.25);
    --red: #ef4444;
    --red-dim: rgba(239, 68, 68, 0.12);
    --red-border: rgba(239, 68, 68, 0.25);
    --purple: #8b5cf6;
    --purple-dim: rgba(139, 92, 246, 0.12);
    --purple-border: rgba(139, 92, 246, 0.25);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --sidebar-w: 228px;
    --header-h: 64px;
    --font: "Geist", -apple-system, sans-serif;
    --mono: "Geist Mono", monospace;
    --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --r: 12px;
    --r-lg: 16px;
}
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    font-size: 16px;
}
body {
    background: var(--bg);
    color: var(--text-primary);
    font-family: var(--font);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
}
a {
    text-decoration: none;
    color: inherit;
}
button {
    cursor: pointer;
    font-family: var(--font);
}
body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(15, 23, 42, 0.018) 2px,
        rgba(15, 23, 42, 0.018) 4px
    );
}

/* ── Shell ── */
.shell {
    display: grid;
    grid-template-columns: var(--sidebar-w) 1fr;
    grid-template-rows: var(--header-h) 1fr;
    min-height: 100vh;
}

/* ── Sidebar ── */
.sidebar {
    grid-row: 1/-1;
    background: var(--panel);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
}
.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 1.25rem;
    height: var(--header-h);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.sidebar-logo__mark {
    width: 32px;
    height: 32px;
    border-radius: 16px;
    background: var(--accent);
    display: grid;
    place-items: center;
    flex-shrink: 0;
}
.sidebar-logo__name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}
.sidebar-nav {
    flex: 1;
    padding: 0.75rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.nav-section-label {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 0.6rem 0.85rem 0.3rem;
    margin-top: 0.25rem;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0.65rem 0.85rem;
    border-radius: var(--r);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition:
        background 0.2s,
        color 0.2s;
    position: relative;
    cursor: pointer;
}
.nav-item:hover {
    background: var(--surface);
    color: var(--text-primary);
}
.nav-item.active {
    background: var(--surface-2);
    color: var(--text-primary);
}
.nav-item.active::before {
    content: "";
    position: absolute;
    left: 0;
    top: 22%;
    bottom: 22%;
    width: 3px;
    background: var(--accent);
    border-radius: 0 3px 3px 0;
}
.nav-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.75;
}
.nav-item.active .nav-icon,
.nav-item:hover .nav-icon {
    opacity: 1;
}
.nav-badge {
    margin-left: auto;
    background: var(--surface-3);
    color: var(--text-secondary);
    font-size: 0.65rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: 6px;
    border: 1px solid var(--border);
}
.nav-badge.alert {
    background: var(--red-dim);
    color: var(--red);
    border-color: var(--red-border);
}
.nav-badge.new {
    background: var(--blue-dim);
    color: var(--blue);
    border-color: var(--blue-border);
}
.nav-item.active .nav-badge {
    background: rgba(15, 23, 42, 0.1);
    color: var(--text-primary);
    border-color: var(--border-md);
}
.nav-divider {
    height: 1px;
    background: var(--border);
    margin: 0.75rem 0.85rem;
}
.sidebar-footer {
    padding: 0.75rem;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}
.sidebar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0.65rem 0.85rem;
    border-radius: var(--r);
    transition: background 0.2s;
    cursor: pointer;
}
.sidebar-user:hover {
    background: var(--surface);
}
.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--surface-2);
    border: 1px solid var(--border-md);
    display: grid;
    place-items: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-primary);
    flex-shrink: 0;
    letter-spacing: 0.02em;
}
.avatar.instructor {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.user-info {
    flex: 1;
    min-width: 0;
}
.user-name {
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.user-plan {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

/* ── Header ── */
.header {
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 1.75rem;
    gap: 1.25rem;
    position: sticky;
    top: 0;
    z-index: 50;
}
.header-left {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.85rem;
}
.header-page {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}
.header-sep {
    color: var(--text-muted);
    font-size: 0.85rem;
}
.header-sub {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}
.header-search {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    padding: 0.45rem 0.9rem;
    width: 240px;
    transition:
        border-color 0.2s,
        width 0.3s var(--ease);
}
.header-search:focus-within {
    border-color: var(--border-md);
    width: 280px;
}
.header-search svg {
    color: var(--text-muted);
    flex-shrink: 0;
}
.header-search input {
    background: none;
    border: none;
    outline: none;
    font-family: var(--font);
    font-size: 0.85rem;
    color: var(--text-primary);
    width: 100%;
}
.header-search input::placeholder {
    color: var(--text-muted);
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}
.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--r);
    background: var(--surface);
    border: 1px solid var(--border);
    display: grid;
    place-items: center;
    color: var(--text-secondary);
    transition:
        border-color 0.2s,
        color 0.2s;
    position: relative;
}
.icon-btn:hover {
    border-color: var(--border-md);
    color: var(--text-primary);
}
.notif-pip {
    position: absolute;
    top: 7px;
    right: 7px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--red);
    border: 1.5px solid var(--panel);
}
.header-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent);
    border: 1px solid var(--border-md);
    display: grid;
    place-items: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
    cursor: pointer;
}

/* ── Main ── */
.main {
    padding: 2rem;
    overflow-y: auto;
    background: var(--bg);
}
.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}

/* Section headers */
.sec-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}
.sec-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}
.sec-action {
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: color 0.2s;
    font-weight: 500;
    cursor: pointer;
}
.sec-action:hover {
    color: var(--text-primary);
}

/* Bento grid */
.bento {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 1.25rem;
}
.c-3 {
    grid-column: span 3;
}
.c-4 {
    grid-column: span 4;
}
.c-5 {
    grid-column: span 5;
}
.c-6 {
    grid-column: span 6;
}
.c-7 {
    grid-column: span 7;
}
.c-8 {
    grid-column: span 8;
}
.c-9 {
    grid-column: span 9;
}
.c-12 {
    grid-column: span 12;
}

/* Card */
.card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    transition: border-color 0.25s;
    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
}
.card:hover {
    border-color: var(--border-md);
    box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
}

/* Buttons */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.7rem 1.25rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--r);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition:
        transform 0.2s var(--spring),
        box-shadow 0.25s,
        background 0.15s;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px -4px rgba(15, 23, 42, 0.25);
    background: #1e2937;
}
.btn-primary.sm {
    padding: 0.5rem 1rem;
    font-size: 0.82rem;
}
.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.7rem 1.25rem;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-md);
    border-radius: var(--r);
    font-size: 0.9rem;
    font-weight: 500;
    transition:
        border-color 0.2s,
        color 0.2s,
        background 0.2s;
}
.btn-ghost:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    background: var(--surface);
}
.btn-ghost.sm {
    padding: 0.5rem 1rem;
    font-size: 0.82rem;
}
.btn-green {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.5rem 1rem;
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid var(--green-border);
    border-radius: var(--r);
    font-size: 0.82rem;
    font-weight: 600;
    transition: background 0.2s;
    cursor: pointer;
}
.btn-green:hover {
    background: rgba(16, 185, 129, 0.2);
}
.btn-amber {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.5rem 1rem;
    background: var(--amber-dim);
    color: var(--amber);
    border: 1px solid var(--amber-border);
    border-radius: var(--r);
    font-size: 0.82rem;
    font-weight: 600;
    transition: background 0.2s;
    cursor: pointer;
}
.btn-red {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.5rem 1rem;
    background: var(--red-dim);
    color: var(--red);
    border: 1px solid var(--red-border);
    border-radius: var(--r);
    font-size: 0.82rem;
    font-weight: 600;
    transition: background 0.2s;
    cursor: pointer;
}

/* Stat cards */
.stat-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--r);
    display: grid;
    place-items: center;
    margin-bottom: 1rem;
}
.stat-icon--white {
    background: rgba(15, 23, 42, 0.06);
    border: 1px solid rgba(15, 23, 42, 0.1);
    color: var(--accent);
}
.stat-icon--blue {
    background: var(--blue-dim);
    border: 1px solid var(--blue-border);
    color: var(--blue);
}
.stat-icon--green {
    background: var(--green-dim);
    border: 1px solid var(--green-border);
    color: var(--green);
}
.stat-icon--purple {
    background: var(--purple-dim);
    border: 1px solid var(--purple-border);
    color: var(--purple);
}
.stat-icon--amber {
    background: var(--amber-dim);
    border: 1px solid var(--amber-border);
    color: var(--amber);
}
.stat-val {
    font-family: var(--mono);
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.04em;
    color: var(--text-primary);
    line-height: 1;
}
.stat-name {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 500;
}
.stat-delta {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 0.75rem;
    padding: 3px 8px;
    border-radius: 6px;
}
.up {
    background: var(--green-dim);
    color: var(--green);
}
.down {
    background: var(--red-dim);
    color: var(--red);
}
.neutral {
    background: var(--surface-2);
    color: var(--text-secondary);
}

/* Welcome instructor card */
.welcome-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--blue-dim);
    border: 1px solid var(--blue-border);
    border-radius: 9999px;
    padding: 3px 10px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--blue);
    margin-bottom: 0.75rem;
}
.welcome-pip {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--blue);
    animation: pip-pulse 2s ease-in-out infinite;
}
@keyframes pip-pulse {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0.35;
    }
}
.welcome-title {
    font-size: clamp(1.75rem, 2.5vw, 2.3rem);
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1.1;
    color: var(--text-primary);
}
.welcome-sub {
    margin-top: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.55;
    max-width: 440px;
}
.welcome-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.25rem;
    flex-wrap: wrap;
}

/* Quick summary strip */
.summary-strip {
    display: flex;
    gap: 1.5rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}
.summary-item {
    display: flex;
    align-items: center;
    gap: 8px;
}
.summary-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--r);
    display: grid;
    place-items: center;
    flex-shrink: 0;
}
.summary-val {
    font-family: var(--mono);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1;
}
.summary-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    font-weight: 500;
}

/* Activity chart bar */
.chart-row {
    display: flex;
    align-items: flex-end;
    gap: 6px;
    height: 80px;
    margin-top: 0.75rem;
}
.chart-bar-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}
.chart-bar {
    width: 100%;
    border-radius: 6px 6px 0 0;
    background: var(--surface-3);
    position: relative;
    transition: background 0.2s;
    min-height: 4px;
}
.chart-bar:hover {
    background: var(--blue);
    cursor: pointer;
}
.chart-bar.today {
    background: var(--accent);
}
.chart-bar.highlight {
    background: var(--blue);
}
.chart-lbl {
    font-size: 0.62rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 500;
}

/* Pending actions */
.action-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.action-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1rem;
    border-radius: var(--r);
    border: 1px solid var(--border);
    background: var(--surface);
    transition:
        border-color 0.2s,
        background 0.2s;
}
.action-item:hover {
    border-color: var(--border-md);
    background: var(--panel);
}
.action-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}
.dot-amber {
    background: var(--amber);
}
.dot-blue {
    background: var(--blue);
}
.dot-red {
    background: var(--red);
}
.dot-green {
    background: var(--green);
}
.action-body {
    flex: 1;
    min-width: 0;
}
.action-title {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
}
.action-sub {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 2px;
}
.action-tag {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 6px;
    white-space: nowrap;
}
.tag-amber {
    background: var(--amber-dim);
    color: var(--amber);
    border: 1px solid var(--amber-border);
}
.tag-blue {
    background: var(--blue-dim);
    color: var(--blue);
    border: 1px solid var(--blue-border);
}
.tag-red {
    background: var(--red-dim);
    color: var(--red);
    border: 1px solid var(--red-border);
}
.tag-green {
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid var(--green-border);
}
.tag-purple {
    background: var(--purple-dim);
    color: var(--purple);
    border: 1px solid var(--purple-border);
}

/* Student list */
.student-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.student-item {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border);
}
.student-item:last-child {
    border-bottom: none;
}
.stu-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--surface-2);
    border: 1px solid var(--border-md);
    display: grid;
    place-items: center;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-primary);
    flex-shrink: 0;
    letter-spacing: 0.02em;
}
.stu-name {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
}
.stu-course {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 1px;
}
.stu-status {
    margin-left: auto;
}

/* Courses table */
.courses-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}
.courses-table th {
    text-align: left;
    padding: 0.6rem 0.85rem;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}
.courses-table th:first-child {
    border-radius: var(--r) 0 0 0;
}
.courses-table th:last-child {
    border-radius: 0 var(--r) 0 0;
}
.courses-table td {
    padding: 0.85rem 0.85rem;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
.courses-table tr:last-child td {
    border-bottom: none;
}
.courses-table tbody tr:hover {
    background: var(--surface);
}
.course-title-cell {
    font-weight: 500;
    color: var(--text-primary);
    max-width: 260px;
}
.course-cat-pill {
    background: var(--blue-dim);
    color: var(--blue);
    border: 1px solid var(--blue-border);
    padding: 2px 8px;
    border-radius: 9999px;
    font-size: 0.72rem;
    font-weight: 600;
    white-space: nowrap;
}
.pub-pill {
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}
.pub-yes {
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid var(--green-border);
}
.pub-no {
    background: var(--amber-dim);
    color: var(--amber);
    border: 1px solid var(--amber-border);
}
.course-actions-cell {
    display: flex;
    align-items: center;
    gap: 4px;
}
.tbl-btn {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    display: grid;
    place-items: center;
    color: var(--text-secondary);
    transition:
        border-color 0.2s,
        color 0.2s;
    cursor: pointer;
}
.tbl-btn:hover {
    border-color: var(--border-md);
    color: var(--text-primary);
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}
.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 5px;
    letter-spacing: 0.02em;
}
.form-input {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border-md);
    border-radius: var(--r);
    padding: 0.65rem 0.9rem;
    font-family: var(--font);
    font-size: 0.88rem;
    color: var(--text-primary);
    outline: none;
    transition:
        border-color 0.2s,
        box-shadow 0.2s;
}
.form-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.06);
}
textarea.form-input {
    resize: vertical;
    min-height: 90px;
}
select.form-input {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2364748b' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.9rem center;
    padding-right: 2.2rem;
}

/* Lesson list */
.lesson-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}
.lesson-item {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}
.lesson-item:last-child {
    border-bottom: none;
}
.lesson-num {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    width: 24px;
    flex-shrink: 0;
    font-weight: 500;
}
.lesson-title-text {
    flex: 1;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
}
.lesson-dur {
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* Lesson format badges */
.lesson-format-badges {
    display: flex;
    gap: 4px;
    margin-left: 0.5rem;
}
.fmt-badge {
    font-size: 0.62rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 5px;
    white-space: nowrap;
    letter-spacing: 0.02em;
}
.fmt-live {
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid var(--green-border);
}
.fmt-transcript {
    background: var(--blue-dim);
    color: var(--blue);
    border: 1px solid var(--blue-border);
}
.fmt-video {
    background: var(--purple-dim);
    color: var(--purple);
    border: 1px solid var(--purple-border);
}

/* Assignments */
.assign-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.assign-item {
    border: 1px solid var(--border);
    border-radius: var(--r);
    overflow: hidden;
}
.assign-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.9rem 1rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}
.assign-title {
    flex: 1;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}
.assign-body {
    padding: 0.9rem 1rem;
}
.assign-meta-row {
    display: flex;
    gap: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}
.submission-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.sub-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border);
}
.sub-item:last-child {
    border-bottom: none;
}
.sub-name {
    flex: 1;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
}
.sub-time {
    font-size: 0.78rem;
    color: var(--text-muted);
    white-space: nowrap;
}
.grade-input {
    width: 64px;
    background: var(--surface);
    border: 1px solid var(--border-md);
    border-radius: 8px;
    padding: 0.35rem 0.5rem;
    font-family: var(--mono);
    font-size: 0.88rem;
    color: var(--text-primary);
    outline: none;
    text-align: center;
    transition: border-color 0.2s;
}
.grade-input:focus {
    border-color: var(--accent);
}

/* Results table */
.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}
.results-table th {
    text-align: left;
    padding: 0.6rem 0.85rem;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}
.results-table td {
    padding: 0.85rem 0.85rem;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
.results-table tr:last-child td {
    border-bottom: none;
}
.results-table tbody tr:hover {
    background: var(--surface);
}
.grade-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    border-radius: 6px;
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 600;
}
.grade-a {
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid var(--green-border);
}
.grade-b {
    background: var(--blue-dim);
    color: var(--blue);
    border: 1px solid var(--blue-border);
}
.grade-c {
    background: var(--amber-dim);
    color: var(--amber);
    border: 1px solid var(--amber-border);
}
.grade-f {
    background: var(--red-dim);
    color: var(--red);
    border: 1px solid var(--red-border);
}
.publish-row-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}
.publish-row-btn.published {
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid var(--green-border);
}
.publish-row-btn.draft {
    background: var(--surface-2);
    color: var(--text-muted);
    border: 1px solid var(--border-md);
}
.results-filters {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}
.filter-chip {
    padding: 0.35rem 0.85rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 500;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    transition:
        background 0.2s,
        border-color 0.2s,
        color 0.2s;
    white-space: nowrap;
}
.filter-chip:hover {
    background: var(--surface-2);
    color: var(--text-primary);
}
.filter-chip.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* Leaderboard */
.lb-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.lb-item {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.85rem 1rem;
    border-radius: var(--r);
    border: 1px solid var(--border);
    background: var(--surface);
    transition:
        border-color 0.2s,
        background 0.2s,
        transform 0.15s;
    cursor: pointer;
}
.lb-item:hover {
    border-color: var(--border-md);
    background: var(--panel);
    transform: translateX(2px);
}
.lb-rank {
    font-family: var(--mono);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted);
    width: 28px;
    text-align: center;
    flex-shrink: 0;
}
.lb-rank.top {
    font-size: 1rem;
}
.lb-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--surface-2);
    border: 1px solid var(--border-md);
    display: grid;
    place-items: center;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-primary);
    flex-shrink: 0;
}
.lb-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}
.lb-course {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 2px;
}
.lb-score {
    font-family: var(--mono);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}
.lb-trend {
    font-size: 0.78rem;
    font-weight: 600;
    margin-left: 0.5rem;
    white-space: nowrap;
}
.trend-up {
    color: var(--green);
}
.trend-down {
    color: var(--red);
}

/* Forum */
.thread-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.thread-item {
    padding: 1rem;
    border-radius: var(--r);
    border: 1px solid var(--border);
    background: var(--surface);
    transition: border-color 0.2s;
}
.thread-item:hover {
    border-color: var(--border-md);
}
.thread-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}
.thread-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}
.thread-body {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.65rem;
    line-height: 1.55;
}
.thread-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}
.thread-tag {
    font-size: 0.68rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: 5px;
}
.thread-tag-announce {
    background: var(--blue-dim);
    color: var(--blue);
    border: 1px solid var(--blue-border);
}
.thread-tag-question {
    background: var(--amber-dim);
    color: var(--amber);
    border: 1px solid var(--amber-border);
}
.thread-tag-discussion {
    background: var(--purple-dim);
    color: var(--purple);
    border: 1px solid var(--purple-border);
}
.forum-compose {
    margin-bottom: 0.85rem;
}
.forum-compose textarea {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border-md);
    border-radius: var(--r);
    padding: 0.85rem;
    font-family: var(--font);
    font-size: 0.88rem;
    color: var(--text-primary);
    min-height: 90px;
    resize: vertical;
    outline: none;
    transition: border-color 0.2s;
}
.forum-compose textarea:focus {
    border-color: var(--accent);
}
.forum-tag-select {
    background: var(--surface);
    border: 1px solid var(--border-md);
    border-radius: var(--r);
    padding: 0.45rem 0.9rem;
    font-family: var(--font);
    font-size: 0.82rem;
    color: var(--text-secondary);
    outline: none;
    cursor: pointer;
}
.instructor-reply-btn {
    margin-top: 0.5rem;
    padding: 0.45rem 0.9rem;
    font-size: 0.8rem;
    font-weight: 600;
    background: transparent;
    border: 1px solid var(--border-md);
    border-radius: var(--r);
    color: var(--text-secondary);
    cursor: pointer;
    transition:
        background 0.2s,
        color 0.2s,
        border-color 0.2s;
}
.instructor-reply-btn:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* Analytics Tab */
.analytics-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 1.25rem;
}
.chart-placeholder {
    background: var(--surface);
    border-radius: var(--r);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.82rem;
    position: relative;
    overflow: hidden;
}
.bar-chart-demo {
    display: flex;
    align-items: flex-end;
    gap: 6px;
    padding: 1.25rem;
    width: 100%;
    height: 100%;
}
.demo-bar {
    flex: 1;
    border-radius: 6px 6px 0 0;
    min-width: 0;
    transition: opacity 0.2s;
}
.demo-bar:hover {
    opacity: 0.8;
    cursor: pointer;
}
.donut-demo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
    background: conic-gradient(
        var(--blue) 0% 42%,
        var(--green) 42% 70%,
        var(--purple) 70% 88%,
        var(--surface-3) 88% 100%
    );
}
.donut-hole {
    position: absolute;
    inset: 22px;
    border-radius: 50%;
    background: var(--panel);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}
.donut-val {
    font-family: var(--mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1;
}
.donut-label {
    font-size: 0.62rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 2px;
}
.legend-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 1rem;
}
.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    color: var(--text-secondary);
}
.legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* Notification center */
.notif-list {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}
.notif-item {
    display: flex;
    align-items: flex-start;
    gap: 0.9rem;
    padding: 0.85rem 1rem;
    border-radius: var(--r);
    border: 1px solid var(--border);
    background: var(--surface);
    transition:
        background 0.2s,
        border-color 0.2s;
}
.notif-item.unread {
    background: var(--blue-dim);
    border-color: var(--blue-border);
}
.notif-item:hover {
    border-color: var(--border-md);
    background: var(--panel);
}
.notif-icon {
    width: 34px;
    height: 34px;
    border-radius: var(--r);
    display: grid;
    place-items: center;
    flex-shrink: 0;
    margin-top: 1px;
}
.notif-text {
    font-size: 0.88rem;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 3px;
    line-height: 1.4;
}
.notif-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Course numbering label */
.course-num-label {
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--surface-2);
    border: 1px solid var(--border);
    padding: 2px 6px;
    border-radius: 5px;
    white-space: nowrap;
    margin-right: 6px;
    letter-spacing: 0.02em;
}
.course-title-full {
    font-weight: 500;
    color: var(--text-primary);
}

/* Category dropdown filter */
.filter-dropdown-wrap {
    position: relative;
    display: inline-block;
}
.filter-dropdown-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.35rem 0.85rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 500;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    transition:
        background 0.2s,
        border-color 0.2s,
        color 0.2s;
}
.filter-dropdown-btn:hover,
.filter-dropdown-btn.active-filter {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.filter-dropdown-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    min-width: 200px;
    background: var(--panel);
    border: 1px solid var(--border-md);
    border-radius: var(--r);
    box-shadow: 0 8px 24px -4px rgba(15, 23, 42, 0.15);
    padding: 0.4rem;
    z-index: 200;
    display: none;
}
.filter-dropdown-menu.open {
    display: block;
}
.filter-dropdown-item {
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition:
        background 0.15s,
        color 0.15s;
    display: flex;
    align-items: center;
    gap: 8px;
}
.filter-dropdown-item:hover,
.filter-dropdown-item.active {
    background: var(--surface-2);
    color: var(--text-primary);
}
.filter-dropdown-item.active::before {
    content: "✓";
    font-size: 0.7rem;
    color: var(--green);
    font-weight: 700;
}

/* Student detail modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(4px);
    z-index: 500;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}
.modal-overlay.open {
    display: flex;
}
.modal {
    background: var(--panel);
    border: 1px solid var(--border-md);
    border-radius: var(--r-lg);
    max-width: 640px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px -10px rgba(15, 23, 42, 0.3);
    animation: modal-in 0.25s var(--spring) both;
}
@keyframes modal-in {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}
.modal-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: var(--panel);
}
.modal-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}
.modal-close {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    display: grid;
    place-items: center;
    color: var(--text-muted);
    cursor: pointer;
    margin-left: auto;
    transition:
        border-color 0.2s,
        color 0.2s;
    font-size: 1.1rem;
}
.modal-close:hover {
    border-color: var(--border-md);
    color: var(--text-primary);
}
.points-breakdown {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.pb-row {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--r);
    border: 1px solid var(--border);
    background: var(--surface);
}
.pb-cat {
    flex: 1;
    min-width: 0;
}
.pb-cat-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}
.pb-reason {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
    line-height: 1.4;
}
.pb-pts {
    font-family: var(--mono);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--green);
    white-space: nowrap;
}
.modal-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}
.info-cell {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    padding: 0.9rem;
}
.info-cell-label {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 4px;
}
.info-cell-val {
    font-family: var(--mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Lesson detail modal */
.lesson-modal-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.25rem;
}
.lm-tab {
    padding: 0.65rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition:
        color 0.2s,
        border-color 0.2s;
    margin-bottom: -1px;
}
.lm-tab.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent);
}
.lm-panel {
    display: none;
}
.lm-panel.active {
    display: block;
}
.transcript-block {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    padding: 1rem;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    white-space: pre-wrap;
    font-family: var(--font);
}
.live-session-info {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.live-detail {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
}
.live-detail-label {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-muted);
    min-width: 90px;
}
.live-detail-val {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
}
.video-placeholder {
    background: var(--surface-2);
    border: 2px dashed var(--border-md);
    border-radius: var(--r);
    height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.88rem;
}

/* Course number badge inline */
.cn-badge {
    display: inline-flex;
    align-items: center;
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--surface-2);
    border: 1px solid var(--border);
    padding: 1px 6px;
    border-radius: 5px;
    margin-right: 4px;
    letter-spacing: 0.03em;
    vertical-align: middle;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--surface);
}
::-webkit-scrollbar-thumb {
    background: var(--border-md);
    border-radius: 6px;
}

/* Animations */
@keyframes fade-up {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.main {
    animation: fade-up 0.5s var(--ease) both;
}
.card {
    animation: fade-up 0.5s var(--ease) both;
}

/* Responsive */
@media (max-width: 1100px) {
    .c-12,
    .c-9,
    .c-8,
    .c-7,
    .c-6,
    .c-5,
    .c-4 {
        grid-column: span 12;
    }
    .c-3 {
        grid-column: span 6;
    }
    .sec-header,
    .page-header,
    .welcome-actions,
    .summary-strip,
    .assign-meta-row,
    .results-filters,
    .action-buttons,
    .thread-header,
    .course-actions-cell {
        flex-wrap: wrap;
        gap: 0.75rem;
    }
    .sec-title,
    .sec-action,
    .page-title,
    .page-sub,
    .course-title-cell,
    .course-info,
    .action-buttons {
        min-width: 0;
    }
}
@media (max-width: 768px) {
    :root {
        --sidebar-w: 0;
    }
    .sidebar {
        display: block;
        position: fixed;
        inset: 0 auto 0 0;
        width: 280px;
        max-width: 85%;
        height: 100vh;
        transform: translateX(-110%);
        transition: transform 0.3s ease;
        z-index: 220;
        box-shadow: 10px 0 34px rgba(15, 23, 42, 0.15);
        background: var(--panel);
    }
    body.sidebar-open .sidebar {
        transform: translateX(0);
    }
    .sidebar-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(15, 23, 42, 0.35);
        z-index: 210;
        opacity: 0;
        transition: opacity 0.3s ease;
        pointer-events: none;
    }
    body.sidebar-open {
        overflow: hidden;
    }
    body.sidebar-open .sidebar-backdrop {
        display: block;
        opacity: 1;
        pointer-events: auto;
    }
    .shell {
        grid-template-columns: 1fr;
    }
    .main {
        padding: 1rem;
    }
    .header-toggle {
        display: inline-flex;
    }
    .header-search {
        display: none;
    }
    .header-actions .icon-btn {
        display: none;
    }
    .header-sep,
    .header-sub {
        display: none;
    }
    .c-12,
    .c-9,
    .c-8,
    .c-7,
    .c-6,
    .c-5,
    .c-4,
    .c-3 {
        grid-column: span 12;
    }
    .sec-header,
    .page-header,
    .welcome-actions,
    .summary-strip,
    .assign-meta-row,
    .results-filters,
    .action-buttons,
    .thread-header,
    .course-actions-cell,
    .assign-header,
    .lesson-item,
    .student-item,
    .lb-item,
    .thread-meta,
    .chart-row,
    .filter-chip {
        flex-wrap: wrap;
        gap: 0.65rem;
    }
    .sec-header,
    .page-header,
    .assign-meta-row,
    .results-filters,
    .action-buttons,
    .course-actions-cell,
    .thread-header {
        align-items: flex-start;
    }
    .card {
        padding: 1rem;
    }
    .btn-primary,
    .btn-ghost,
    .btn-green,
    .btn-amber,
    .btn-red,
    .btn-outline-sm,
    .btn-primary-sm,
    .btn-success-sm,
    .btn-secondary-sm,
    .btn-danger-sm {
        width: 100%;
        justify-content: center;
    }
    .course-title-cell,
    .course-info,
    .action-buttons,
    .assign-meta-row,
    .results-filters {
        width: 100%;
    }
    .course-title-cell {
        max-width: 100%;
        word-break: break-word;
    }
    .table-responsive {
        overflow-x: auto;
    }
    .courses-table,
    .results-table,
    .data-table {
        width: 100%;
        min-width: 0;
    }
    .lesson-item,
    .action-item,
    .student-item,
    .lb-item,
    .thread-item,
    .assign-header {
        flex-direction: column;
        align-items: stretch;
    }
}
@media (max-width: 540px) {
    .page-title {
        font-size: 1.2rem;
    }
    .welcome-title {
        font-size: 1.5rem;
    }
    .summary-strip,
    .chart-row,
    .filter-chip,
    .results-filters,
    .action-buttons {
        gap: 0.5rem;
    }
    .btn-primary,
    .btn-ghost,
    .btn-green,
    .btn-amber,
    .btn-red,
    .btn-outline-sm,
    .btn-primary-sm,
    .btn-success-sm,
    .btn-secondary-sm,
    .btn-danger-sm {
        padding: 0.65rem 0.9rem;
        font-size: 0.82rem;
    }
}

/* Loading Message */
.loading-message {
    padding: 0.75rem 1rem;
    background: var(--blue-dim);
    border: 1px solid var(--blue-border);
    border-radius: var(--r);
    color: var(--blue);
    margin-bottom: 1rem;
    font-size: 0.85rem;
}

/* Table Responsive */
.table-responsive {
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

/* Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    padding: 0.85rem 1rem;
    text-align: left;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.data-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.data-table tr:hover {
    background: var(--surface);
}

/* Course Title Cell */
.course-title-cell {
    color: var(--text-primary);
    font-weight: 500;
}

.course-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.course-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    color: var(--text-secondary);
}

/* Status Badge */
.status-badge {
    display: inline-block;
    margin-left: 0.5rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.65rem;
    font-weight: 600;
}

.status-live {
    background: var(--green-dim);
    color: var(--green);
}

/* Price Cell */
.price-cell {
    color: var(--text-primary);
    font-family: var(--mono);
    font-weight: 500;
}

/* Action Buttons Container */
.action-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Button Styles */
.btn-outline-sm,
.btn-success-sm,
.btn-secondary-sm,
.btn-danger-sm,
.btn-primary-sm {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.4rem 0.8rem;
    border-radius: var(--r);
    font-size: 0.75rem;
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
    text-decoration: none;
}

.btn-outline-sm {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-md);
}

.btn-outline-sm:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    background: var(--surface);
}

.btn-primary-sm {
    background: var(--accent);
    color: white;
    border: none;
}

.btn-primary-sm:hover {
    background: #1e2937;
    transform: translateY(-1px);
}

.btn-success-sm {
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid var(--green);
}

.btn-success-sm:hover {
    background: var(--green);
    color: white;
}

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

.btn-secondary-sm:hover {
    background: var(--surface-2);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.btn-danger-sm {
    background: var(--red-dim);
    color: var(--red);
    border: 1px solid var(--red);
}

.btn-danger-sm:hover {
    background: var(--red);
    color: white;
}

/* Pagination Wrapper */
.pagination-wrapper {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

/* Edit Form Container */
.edit-form-container {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.edit-form-container .sec-header {
    margin-bottom: 1.25rem;
}

/* Form Group Spacing */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.65rem 0.9rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    font-family: var(--font);
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: border-color 0.2s;
    outline: none;
}

.form-control:focus {
    border-color: var(--border-md);
}

/* Alert Success */
.alert-success {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    background: var(--green-dim);
    border: 1px solid var(--green-border);
    border-radius: var(--r);
    color: var(--green);
    margin-bottom: 1.25rem;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    /* Semi-transparent black */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    /* Ensures it stays on top of the table */
}

.modal-overlay.open {
    display: flex;
}

.modal-box {
    background: var(--panel);
    border: 1px solid var(--border-md);
    border-radius: 18px;
    padding: 1.75rem;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.14);
    animation: modal-in 0.25s var(--spring);
}

/* Search Box */
.search-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    transition: border-color 0.2s;
}

.search-box:focus-within {
    border-color: var(--border-md);
}

.search-box svg {
    color: var(--text-muted);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-family: var(--font);
    font-size: 0.85rem;
    color: var(--text-primary);
}

.search-input::placeholder {
    color: var(--text-muted);
}

/* Instructor Stats */
.instructor-stats {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}