/* ═══════════════════════════════════════════════════
   AI/ML Lab Dashboard — Complete Design System
   Master Control Hub • Prof. Richa Choudhary
   ═══════════════════════════════════════════════════ */

/* ── Design Tokens ── */
:root {
    --primary: #3525cd;
    --primary-container: #4f46e5;
    --primary-hover: #3b35d9;
    --background: #f9f9ff;
    --surface: #ffffff;
    --on-background: #111c2d;
    --on-surface-variant: #464555;
    --success: #006e2f;
    --success-bg: #e6f7ec;
    --error: #ba1a1a;
    --error-bg: #ffdad6;
    --surface-variant: #d8e3fb;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;

    --radius-sm: 0.25rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.12);
}

/* ── Reset & Base ── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--background);
    color: var(--on-background);
    min-height: 100vh;
    padding-bottom: 60px;
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════
   TOP HEADER
   ═══════════════════════════════════════════════════ */
.top-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 24px;
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

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

.header-left h1 {
    font-size: 18px;
    font-weight: 800;
    color: #0f172a;
    letter-spacing: -0.02em;
}

.header-sub {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.logo-circle {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 18px;
    flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════
   BADGES
   ═══════════════════════════════════════════════════ */
.badge {
    font-size: 11px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge-connected {
    background: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
}

.badge-disconnected {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.badge-camera {
    background: #fee2e2;
    color: #dc2626;
    border: 1px solid #fca5a5;
    font-weight: 700;
}

.badge-unupdated {
    background: #fef3c7 !important;
    color: #92400e !important;
    border: 1.5px solid #f59e0b !important;
    font-weight: 700 !important;
}

.pill-count {
    background: #e2e8f0;
    color: #334155;
    padding: 1px 7px;
    border-radius: var(--radius-full);
    font-size: 10px;
    font-weight: 700;
}

/* ═══════════════════════════════════════════════════
   DROPDOWN MENU
   ═══════════════════════════════════════════════════ */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle::after {
    content: " ▾";
    font-size: 10px;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 240px;
    z-index: 999;
    overflow: hidden;
    animation: dropdownFade 0.15s ease;
}

.dropdown-menu.open {
    display: block;
}

@keyframes dropdownFade {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.dropdown-item {
    display: block;
    padding: 10px 16px;
    font-size: 13px;
    color: #334155;
    text-decoration: none;
    transition: background 0.12s;
    border-bottom: 1px solid #f1f5f9;
}

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

.dropdown-item:hover {
    background: #f8fafc;
    color: var(--primary);
}

/* ═══════════════════════════════════════════════════
   TAB NAVIGATION
   ═══════════════════════════════════════════════════ */
.tab-nav {
    display: flex;
    gap: 0;
    background: #ffffff;
    border-bottom: 2px solid var(--border);
    padding: 0 24px;
    overflow-x: auto;
    scrollbar-width: thin;
}

.tab-nav::-webkit-scrollbar { height: 3px; }
.tab-nav::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }

.tab-btn {
    padding: 12px 18px;
    border: none;
    background: none;
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    color: var(--on-surface-variant);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--on-background);
    background: rgba(79, 70, 229, 0.04);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* ═══════════════════════════════════════════════════
   TAB CONTENT
   ═══════════════════════════════════════════════════ */
.tab-content {
    display: none;
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

.tab-content.active {
    display: block;
}

/* ═══════════════════════════════════════════════════
   PAGE & SECTION TITLES
   ═══════════════════════════════════════════════════ */
.page-title {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.page-title h2 {
    font-size: 22px;
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 4px;
    letter-spacing: -0.01em;
}

.page-title p {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0;
}

.section-title {
    font-size: 16px;
    font-weight: 700;
    color: #1e293b;
    margin: 20px 0 14px;
}

.section-sub {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 28px 0;
}

/* ═══════════════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════════════ */
.btn {
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    padding: 9px 18px;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary {
    background: var(--primary);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.btn-secondary {
    background: #f1f5f9;
    color: #475569;
    border: 1px solid #cbd5e1;
}

.btn-secondary:hover {
    background: #e2e8f0;
    border-color: #94a3b8;
}

.btn-danger {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fca5a5;
}

.btn-danger:hover {
    background: #fee2e2;
    border-color: #ef4444;
}

.btn-text {
    background: none;
    border: none;
    color: var(--primary);
    font-family: inherit;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: all 0.15s;
}

.btn-text:hover {
    background: rgba(79, 70, 229, 0.06);
    text-decoration: underline;
}

.btn-icon {
    font-size: 18px;
    padding: 6px 10px;
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s ease;
}

.btn-icon:hover { background: #f1f5f9; }

.btn-copy {
    font-family: inherit;
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    background: #eff6ff;
    color: #2563eb;
    border: 1px solid #bfdbfe;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-copy:hover { background: #dbeafe; }

.btn-free-pc {
    margin-top: 8px;
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 600;
    color: #dc2626;
    background: #ffffff;
    border: 1px solid #fca5a5;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-free-pc:hover {
    background: #fef2f2;
    border-color: #ef4444;
}

/* ═══════════════════════════════════════════════════
   FORM ELEMENTS
   ═══════════════════════════════════════════════════ */
.form-group {
    margin-bottom: 12px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #334155;
    margin-bottom: 6px;
}

.sub-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
    display: block;
}

.form-select, .form-input {
    font-family: inherit;
    font-size: 14px;
    padding: 10px 14px;
    border: 1px solid #cbd5e1;
    border-radius: var(--radius-lg);
    background: var(--surface);
    color: var(--on-background);
    outline: none;
    width: 100%;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-select:focus, .form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.08);
}

.form-select { min-width: 140px; }

.form-row {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.toggle-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 500;
    color: #334155;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}

/* ═══════════════════════════════════════════════════
   METRICS ROW
   ═══════════════════════════════════════════════════ */
.metrics-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin-bottom: 24px;
}

.metric-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s, box-shadow 0.15s;
}

.metric-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.metric-value {
    font-size: 36px;
    font-weight: 800;
    color: #1e293b;
    line-height: 1.1;
}

.metric-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: 6px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.metric-green .metric-value { color: #16a34a; }
.metric-red .metric-value { color: #dc2626; }

/* ═══════════════════════════════════════════════════
   PC GRID & CARDS
   ═══════════════════════════════════════════════════ */
.pc-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
    margin-bottom: 24px;
}

.pc-card {
    border-radius: var(--radius-xl);
    padding: 16px;
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    cursor: pointer;
    border: 2px solid var(--border);
}

.pc-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.pc-card-free, .pc-free {
    background-color: var(--success-bg);
    border-color: var(--success);
}

.pc-card-occupied, .pc-occupied {
    background-color: var(--error-bg);
    border-color: var(--error);
}

.pc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.pc-name {
    font-size: 20px;
    font-weight: 800;
    color: var(--on-background);
    letter-spacing: -0.02em;
}

.pc-status-pill {
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: var(--radius-full);
}

.pill-free {
    background: var(--success);
    color: #fff;
}

.pill-occupied {
    background: var(--error);
    color: #fff;
}

.pc-body {
    min-height: 50px;
}

.pc-user {
    font-size: 12px;
    margin: 0;
}

.pc-card .pc-title {
    font-size: 48px;
    font-weight: 800;
    color: var(--on-background);
    margin-bottom: 6px;
    letter-spacing: -0.02em;
}

.status-badge {
    display: inline-block;
    font-weight: 700;
    font-size: 12px;
    padding: 3px 12px;
    border-radius: var(--radius-full);
    color: #ffffff;
}

.badge-free { background-color: var(--success); }
.badge-occupied { background-color: var(--error); }

.pc-meta {
    font-size: 13px;
    color: #4b5563;
    margin-top: 8px;
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════
   WORKSTATION ALLOTMENT PANEL
   ═══════════════════════════════════════════════════ */
.allotment-panel {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.allotment-form-card, .enroll-form-box {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: var(--shadow-sm);
}

.range-box {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-top: 12px;
}

.range-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.quick-preset-row {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed #cbd5e1;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.preset-label {
    font-size: 12px;
    font-weight: 600;
    color: #475569;
}

.duration-chips {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.chip-btn {
    padding: 5px 12px;
    font-size: 12px;
    font-weight: 600;
    background: #ffffff;
    color: #475569;
    border: 1px solid #cbd5e1;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit;
}

.chip-btn:hover {
    background: #f1f5f9;
    border-color: #94a3b8;
}

.chip-btn.active {
    background: var(--primary-container);
    color: #ffffff;
    border-color: var(--primary-container);
}

.preview-banner {
    background: #e0e7ff;
    color: #3730a3;
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 500;
}

/* ═══════════════════════════════════════════════════
   MESSAGE TEMPLATES
   ═══════════════════════════════════════════════════ */
.template-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.msg-template {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.msg-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    background: #f8fafc;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

.msg-body {
    padding: 14px 16px;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 12px;
    line-height: 1.6;
    color: #334155;
    white-space: pre-wrap;
    margin: 0;
    background: #ffffff;
}

/* ═══════════════════════════════════════════════════
   FILTER BAR (ATTENDANCE)
   ═══════════════════════════════════════════════════ */
.filter-bar {
    display: flex;
    gap: 14px;
    align-items: flex-end;
    flex-wrap: wrap;
    margin-bottom: 20px;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px 20px;
    box-shadow: var(--shadow-sm);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.filter-group label {
    font-size: 12px;
    font-weight: 600;
    color: #475569;
}

.filter-actions {
    display: flex;
    gap: 8px;
    flex-direction: row;
    align-items: flex-end;
}

/* ═══════════════════════════════════════════════════
   DATA TABLE
   ═══════════════════════════════════════════════════ */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    font-size: 14px;
    box-shadow: var(--shadow-sm);
}

.data-table thead {
    background: #f8fafc;
}

.data-table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 700;
    color: #475569;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border);
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-light);
    color: #334155;
    font-size: 13px;
}

.data-table tbody tr:hover { background: #f8fafc; }
.data-table tbody tr:last-child td { border-bottom: none; }

#attendance-status, #faces-status {
    margin-bottom: 16px;
    font-size: 14px;
    font-weight: 600;
}

/* ═══════════════════════════════════════════════════
   MANUAL ENTRY CARD
   ═══════════════════════════════════════════════════ */
.manual-entry-card {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 20px;
}

/* ═══════════════════════════════════════════════════
   UNKNOWN FACES GRID & CARDS
   ═══════════════════════════════════════════════════ */
.faces-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.face-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s ease, box-shadow 0.15s;
}

.face-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.face-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    display: block;
}

.face-card .face-info {
    padding: 10px 12px;
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Unknown Cards (newer layout) */
.unknown-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s, box-shadow 0.15s;
}

.unknown-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.unknown-img-wrap {
    cursor: pointer;
    overflow: hidden;
    background: #1e293b;
}

.unknown-img-wrap img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
    display: block;
    transition: transform 0.2s;
}

.unknown-img-wrap:hover img {
    transform: scale(1.05);
}

.unknown-meta {
    padding: 10px 12px;
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.5;
    border-top: 1px solid var(--border-light);
}

/* ═══════════════════════════════════════════════════
   MODALS
   ═══════════════════════════════════════════════════ */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

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

.modal-card {
    background: #ffffff;
    border-radius: 18px;
    padding: 28px;
    max-width: 480px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    animation: modalSlideIn 0.2s ease;
}

@keyframes modalSlideIn {
    from { opacity: 0; transform: translateY(-10px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 17px;
    font-weight: 700;
    color: #0f172a;
}

.modal-close-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: #f8fafc;
    color: #64748b;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    font-family: inherit;
}

.modal-close-btn:hover {
    background: #fef2f2;
    color: #dc2626;
    border-color: #fca5a5;
}

.modal-lightbox {
    max-width: 600px;
}

.modal-card h2 {
    font-size: 20px;
    margin-bottom: 8px;
}

.modal-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.modal-card input {
    width: 100%;
    padding: 12px 14px;
    font-size: 14px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    margin-bottom: 14px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.modal-card input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.08);
}

.modal-actions {
    display: flex;
    gap: 10px;
}

/* ═══════════════════════════════════════════════════
   LIVE GATE CAMERA & SURVEILLANCE
   ═══════════════════════════════════════════════════ */
.gate-monitor-layout {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 20px;
    margin-top: 15px;
}

.video-stream-card {
    background: #0f172a;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 2px solid #1e293b;
    display: flex;
    flex-direction: column;
}

.stream-header-bar {
    background: #1e293b;
    color: #f8fafc;
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #334155;
}

.stream-rec-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.05em;
}

.rec-dot {
    width: 10px;
    height: 10px;
    background: #ef4444;
    border-radius: 50%;
    display: inline-block;
    animation: pulseRec 1.5s infinite;
}

@keyframes pulseRec {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.3; transform: scale(0.8); }
}

.stream-clock {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
}

.stream-viewport {
    position: relative;
    background: #020617;
    min-height: 380px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.stream-viewport img {
    width: 100%;
    height: auto;
    max-height: 460px;
    object-fit: contain;
    display: block;
}

.stream-fallback {
    text-align: center;
    color: var(--text-muted);
    padding: 40px 20px;
}

.stream-fallback .fallback-icon {
    font-size: 48px;
    margin-bottom: 10px;
}

.stream-footer-bar {
    background: #1e293b;
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px;
    color: #cbd5e1;
    border-top: 1px solid #334155;
}

.stream-legend {
    display: flex;
    gap: 14px;
    align-items: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.legend-box {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 2px;
    margin-right: 4px;
}

.legend-green { background: #10b981; }
.legend-red { background: #ef4444; }

.kiosk-quick-msg {
    font-weight: 700;
    color: #38bdf8;
}

/* Gate Sidebar */
.gate-sidebar {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.security-card, .recent-intruders-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 16px;
    box-shadow: var(--shadow-sm);
}

.security-card h3 {
    margin: 0 0 12px 0;
    font-size: 14px;
    color: #0f172a;
    font-weight: 700;
}

.stat-badge-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.sec-stat-item {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px;
    text-align: center;
}

.sec-stat-val {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: #0f172a;
    line-height: 1.2;
}

.sec-stat-lbl {
    font-size: 10px;
    color: var(--text-secondary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 4px;
    display: block;
}

.sec-stat-item.sec-alert {
    background: #fef2f2;
    border-color: #fecaca;
}

.sec-stat-item.sec-alert .sec-stat-val { color: #dc2626; }

.intruder-thumb-strip {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 290px;
    overflow-y: auto;
}

.intruder-strip-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s;
}

.intruder-strip-item:hover { background: var(--border-light); }

.intruder-strip-item img {
    width: 48px;
    height: 48px;
    border-radius: 6px;
    object-fit: cover;
    border: 1.5px solid #ef4444;
}

/* ═══════════════════════════════════════════════════
   CATEGORY FILTER CHIPS & ROLE BADGES
   ═══════════════════════════════════════════════════ */
.category-filter-chips, .role-selector-chips {
    display: flex;
    gap: 8px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.cat-chip-btn, .role-chip-btn {
    padding: 7px 14px;
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    background: #ffffff;
    color: var(--text-secondary);
    border: 1px solid #cbd5e1;
    cursor: pointer;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: inherit;
}

.cat-chip-btn:hover, .role-chip-btn:hover {
    background: #f1f5f9;
    border-color: #94a3b8;
}

.cat-chip-btn.active, .role-chip-btn.active {
    background: var(--primary-container);
    color: #ffffff;
    border-color: var(--primary-container);
}

.cat-pill {
    padding: 1px 7px;
    font-size: 10px;
    border-radius: var(--radius-full);
    background: rgba(0, 0, 0, 0.08);
    font-weight: 700;
}

.cat-chip-btn.active .cat-pill {
    background: rgba(255, 255, 255, 0.25);
}

.role-badge {
    display: inline-block;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-role-student { background: #e0e7ff; color: #3730a3; }
.badge-role-faculty { background: #fef3c7; color: #92400e; }
.badge-role-guest { background: #d1fae5; color: #065f46; }

/* ═══════════════════════════════════════════════════
   ADMIN CARDS
   ═══════════════════════════════════════════════════ */
.admin-action-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 20px;
}

.admin-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: var(--shadow-sm);
}

.admin-card h3 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 8px;
}

.admin-card p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ═══════════════════════════════════════════════════
   WEEKLY TIMETABLE SCHEDULER
   ═══════════════════════════════════════════════════ */
.tt-booking-bar {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 18px 20px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}

.tt-booking-bar-inner {
    display: flex;
    gap: 14px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.tt-summary-bar {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--border-light);
    font-size: 12px;
    color: var(--text-secondary);
}

.tt-grid-wrapper {
    overflow-x: auto;
    border-radius: 14px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    background: #ffffff;
}

.tt-grid {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    min-width: 700px;
}

.tt-grid th {
    padding: 12px 14px;
    background: #f8fafc;
    font-weight: 700;
    font-size: 12px;
    color: #475569;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    border-bottom: 2px solid var(--border);
    text-align: center;
    position: sticky;
    top: 0;
}

.tt-corner-cell {
    background: #f1f5f9 !important;
    font-weight: 700 !important;
    text-align: left !important;
    min-width: 140px;
}

.tt-grid td {
    padding: 8px 10px;
    border: 1px solid var(--border-light);
    text-align: center;
    vertical-align: middle;
    transition: background 0.12s;
}

.tt-grid tbody tr:hover {
    background: rgba(79, 70, 229, 0.02);
}

.tt-slot-label {
    font-weight: 700;
    font-size: 12px;
    color: #0f172a;
    background: #f8fafc;
    text-align: left !important;
    padding-left: 14px !important;
    white-space: nowrap;
    min-width: 140px;
}

.tt-slot-label .slot-time {
    display: block;
    font-size: 10px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* Timetable Cell States */
.tt-cell-available {
    background: #f0fdf4;
    cursor: pointer;
    color: var(--success);
    font-weight: 600;
    font-size: 12px;
    border-radius: 4px;
}

.tt-cell-available:hover {
    background: #dcfce7;
    box-shadow: inset 0 0 0 2px #86efac;
}

.tt-cell-mine {
    background: #e0e7ff;
    color: var(--primary);
    font-weight: 700;
    font-size: 11px;
    border-radius: 4px;
}

.tt-cell-others {
    background: #fef3c7;
    color: #92400e;
    font-weight: 600;
    font-size: 11px;
    border-radius: 4px;
}

/* Timetable Legend */
.tt-legend {
    display: flex;
    gap: 20px;
    margin-top: 16px;
    padding: 12px 16px;
    background: #f8fafc;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.tt-legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: #475569;
    font-weight: 500;
}

.tt-legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 4px;
    display: inline-block;
}

.tt-dot-available { background: #86efac; border: 1px solid #22c55e; }
.tt-dot-mine { background: #a5b4fc; border: 1px solid var(--primary); }
.tt-dot-others { background: #fde68a; border: 1px solid #f59e0b; }

/* Timetable My Bookings */
.tt-my-bookings {
    margin-top: 20px;
}

.tt-bookings-chips {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 10px;
}

.tt-booking-chip {
    background: #e0e7ff;
    color: var(--primary);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ═══════════════════════════════════════════════════
   INFO / WARNING BOXES
   ═══════════════════════════════════════════════════ */
.info-box {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 10px;
    padding: 14px 18px;
    font-size: 13px;
    color: #1e40af;
}

.warning-box {
    background: #fffbeb;
    border: 1px solid #fde68a;
    border-radius: 10px;
    padding: 14px 18px;
    font-size: 13px;
    color: #92400e;
}

.success-box {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: 10px;
    padding: 14px 18px;
    font-size: 13px;
    color: #166534;
}

.msg-success { color: #16a34a; }
.msg-error { color: #dc2626; }

/* ═══════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════ */
.app-footer {
    text-align: center;
    padding: 20px;
    font-size: 12px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    margin-top: 40px;
}

/* ═══════════════════════════════════════════════════
   LOADING SPINNER
   ═══════════════════════════════════════════════════ */
.spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ═══════════════════════════════════════════════════
   OFFLINE / UNUPDATED CORNER BADGE
   ═══════════════════════════════════════════════════ */
.corner-unupdated-badge {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: #fffbeb;
    color: #92400e;
    border: 1.5px solid #fcd34d;
    box-shadow: 0 10px 25px rgba(217, 119, 6, 0.25);
    border-radius: var(--radius-full);
    padding: 9px 18px;
    font-size: 12px;
    font-weight: 700;
    display: none;
    align-items: center;
    gap: 8px;
    z-index: 99999;
    backdrop-filter: blur(8px);
    animation: pulseWarning 2s infinite ease-in-out;
}

@keyframes pulseWarning {
    0%, 100% { box-shadow: 0 4px 14px rgba(217, 119, 6, 0.2); transform: scale(1); }
    50% { box-shadow: 0 8px 24px rgba(217, 119, 6, 0.38); transform: scale(1.03); }
}

#connection-status {
    margin-top: 12px;
    font-size: 14px;
    font-weight: 600;
}

/* ═══════════════════════════════════════════════════
   RESPONSIVE BREAKPOINTS
   ═══════════════════════════════════════════════════ */
@media (max-width: 900px) {
    .top-header {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
    .pc-grid { grid-template-columns: repeat(3, 1fr); }
    .faces-grid { grid-template-columns: repeat(3, 1fr); }
    .gate-monitor-layout { grid-template-columns: 1fr; }
    .range-grid { grid-template-columns: 1fr 1fr; }
    .admin-action-cards { grid-template-columns: 1fr; }
    .template-grid { grid-template-columns: 1fr; }
    .tt-booking-bar-inner { flex-direction: column; align-items: stretch; }
}

@media (max-width: 600px) {
    .pc-grid { grid-template-columns: repeat(2, 1fr); }
    .faces-grid { grid-template-columns: repeat(2, 1fr); }
    .metrics-row { grid-template-columns: 1fr; }
    .filter-bar { flex-direction: column; align-items: stretch; }
    .tab-btn { font-size: 12px; padding: 10px 12px; }
    .page-title { flex-direction: column; }
    .page-title h2 { font-size: 18px; }
    .range-grid { grid-template-columns: 1fr; }
    .tt-legend { flex-direction: column; gap: 10px; }
}