/* ═══════════════════════════════════════════
   IoT Attend — Luxury Industrial Theme
   Aesthetic: Bloomberg Terminal × Automotive HUD
   ═══════════════════════════════════════════ */

:root {
    /* Core Palette — Deep navy with electric cyan */
    --bg-base: #0a0e17;
    --bg-raised: #0f1520;
    --bg-surface: #141c2b;
    --bg-surface-hover: #1a2436;
    --border: rgba(0, 240, 255, 0.10);
    --border-strong: rgba(0, 240, 255, 0.22);
    --border-focus: rgba(0, 240, 255, 0.45);

    /* Typography — High visibility palette */
    --text: #edf0f7;
    --text-secondary: #a3b1c6;
    --text-muted: #7a8ba5;
    --text-dim: #546580;

    /* Accents */
    --cyan: #00f0ff;
    --cyan-dim: rgba(0, 240, 255, 0.12);
    --cyan-glow: rgba(0, 240, 255, 0.06);
    --amber: #ffb800;
    --amber-dim: rgba(255, 184, 0, 0.12);
    --green: #00e676;
    --green-dim: rgba(0, 230, 118, 0.12);
    --red: #ff3d57;
    --red-dim: rgba(255, 61, 87, 0.12);
    --blue: #3d8bfd;
    --blue-dim: rgba(61, 139, 253, 0.12);

    /* Semantic */
    --success: var(--green);
    --success-bg: var(--green-dim);
    --warning: var(--amber);
    --warning-bg: var(--amber-dim);
    --danger: var(--red);
    --danger-bg: var(--red-dim);
    --info: var(--blue);
    --info-bg: var(--blue-dim);

    /* Geometry */
    --radius: 8px;
    --radius-sm: 5px;
    --radius-xs: 3px;
    --sidebar-w: 240px;

    /* Motion */
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
    --transition: 0.2s var(--ease);
    --transition-slow: 0.5s var(--ease);

    /* Shadows */
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.08);
}

/* RESET */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'DM Sans', -apple-system, sans-serif;
    background: var(--bg-base);
    color: var(--text);
    line-height: 1.6;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
input, select, button, textarea { font-family: inherit; outline: none; }

/* AMBIENT BACKGROUND */
.ambient-bg {
    position: fixed; inset: 0; z-index: 0; pointer-events: none;
    background:
        radial-gradient(ellipse 80% 60% at 10% 90%, rgba(0, 240, 255, 0.03) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 90% 10%, rgba(255, 184, 0, 0.02) 0%, transparent 60%),
        var(--bg-base);
}
.grid-overlay {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(0, 240, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 80%);
}
.glow-orb {
    position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.4;
    animation: drift 20s ease-in-out infinite alternate;
}
.orb-1 { width: 300px; height: 300px; background: rgba(0, 240, 255, 0.04); top: 10%; left: 5%; }
.orb-2 { width: 250px; height: 250px; background: rgba(255, 184, 0, 0.03); bottom: 10%; right: 10%; animation-delay: -10s; }
@keyframes drift { 0% { transform: translate(0, 0); } 100% { transform: translate(30px, -20px); } }

/* APP LAYOUT */
.app { display: flex; height: 100vh; width: 100vw; position: relative; z-index: 1; }

/* ═══════════ SIDEBAR ═══════════ */
.sidebar {
    width: var(--sidebar-w); background: var(--bg-raised);
    border-right: 1px solid var(--border);
    display: flex; flex-direction: column; flex-shrink: 0; z-index: 100;
    transition: transform 0.3s var(--ease);
}
.sidebar-header {
    padding: 22px 18px 18px;
    border-bottom: 1px solid var(--border);
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark { width: 34px; height: 34px; flex-shrink: 0; }
.logo-mark svg { width: 100%; height: 100%; }
.logo-type { display: flex; flex-direction: column; }
.logo-name { font-family: 'Outfit', sans-serif; font-size: 19px; font-weight: 800; letter-spacing: -0.5px; }
.logo-name .cyan { color: var(--cyan); }
.logo-version {
    font-family: 'JetBrains Mono', monospace; font-size: 9px; font-weight: 500;
    color: var(--text-muted); letter-spacing: 2px; text-transform: uppercase; margin-top: -2px;
}

.sidebar-nav { flex: 1; padding: 12px 10px; display: flex; flex-direction: column; gap: 1px; overflow-y: auto; }
.nav-section-label {
    font-family: 'JetBrains Mono', monospace; font-size: 9px; font-weight: 600;
    color: var(--text-dim); letter-spacing: 2.5px; padding: 16px 12px 6px;
    text-transform: uppercase;
}
.nav-item {
    display: flex; align-items: center; gap: 10px;
    padding: 9px 12px; border-radius: var(--radius-sm);
    font-size: 13px; font-weight: 500; color: var(--text-muted);
    transition: all var(--transition); cursor: pointer; position: relative;
}
.nav-item i { width: 17px; height: 17px; flex-shrink: 0; }
.nav-item:hover { background: var(--bg-surface-hover); color: var(--text-secondary); }
.nav-item.active { background: var(--cyan-dim); color: var(--cyan); font-weight: 600; }
.nav-indicator {
    position: absolute; left: 0; top: 50%; transform: translateY(-50%);
    width: 3px; height: 16px; background: var(--cyan); border-radius: 0 3px 3px 0;
    opacity: 0; transition: opacity var(--transition);
}
.nav-item.active .nav-indicator { opacity: 1; }

.sidebar-footer {
    padding: 12px 18px 16px;
    border-top: 1px solid var(--border);
    display: flex; flex-direction: column; gap: 5px;
}
.system-status, .ws-status {
    display: flex; align-items: center; gap: 7px;
    font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-muted);
    letter-spacing: 0.3px;
}
.status-ring {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--green); box-shadow: 0 0 8px rgba(0, 230, 118, 0.5);
    animation: pulse-ring 2.5s ease-in-out infinite;
}
@keyframes pulse-ring {
    0%, 100% { box-shadow: 0 0 4px rgba(0, 230, 118, 0.3); }
    50% { box-shadow: 0 0 12px rgba(0, 230, 118, 0.6); }
}
.pulse-dot { /* compat alias */
    width: 8px; height: 8px; border-radius: 50%; background: var(--green);
    animation: pulse-ring 2.5s ease-in-out infinite;
}
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.7); z-index: 99; }

/* ═══════════ MAIN ═══════════ */
.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-width: 0; }

/* ═══════════ TOPBAR ═══════════ */
.topbar {
    display: flex; justify-content: space-between; align-items: center;
    padding: 14px 24px; border-bottom: 1px solid var(--border); flex-shrink: 0; gap: 16px;
    background: rgba(15, 21, 32, 0.6); backdrop-filter: blur(12px);
}
.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar-title-group h1 {
    font-family: 'Outfit', sans-serif; font-size: 20px; font-weight: 700;
    letter-spacing: -0.3px;
}
.subtitle {
    font-family: 'JetBrains Mono', monospace; font-size: 10.5px;
    color: var(--text-muted); letter-spacing: 0.5px; margin-top: 1px;
}
.topbar-right { display: flex; align-items: center; gap: 10px; }
.hamburger { display: none; background: none; border: none; color: var(--text); cursor: pointer; padding: 4px; }
.topbar-chip {
    display: flex; align-items: center; gap: 6px;
    font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 500;
    color: var(--text-muted); background: var(--bg-surface);
    padding: 5px 12px; border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}
.live-chip { border-color: var(--border-strong); color: var(--cyan); }
.live-dot {
    width: 6px; height: 6px; background: var(--green); border-radius: 50%;
    box-shadow: 0 0 6px rgba(0, 230, 118, 0.5);
    animation: pulse-ring 2.5s ease-in-out infinite;
}
.today-info { /* compat */ }
.session-badge { /* compat alias */
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--bg-surface); border: 1px solid var(--border-strong);
    padding: 5px 12px; border-radius: var(--radius-sm);
    font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 600; color: var(--cyan);
}

/* Date Picker Group */
.date-picker-group {
    display: flex; align-items: center; gap: 2px;
}
.date-nav-btn {
    cursor: pointer; padding: 5px 6px !important; gap: 0 !important;
    transition: all var(--transition);
}
.date-nav-btn:hover { background: var(--bg-surface-hover); color: var(--cyan); border-color: var(--border-strong); }
.date-chip {
    cursor: pointer; position: relative; min-width: 120px; justify-content: center;
}
.date-input {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    opacity: 0; cursor: pointer; border: none; background: none;
    font-family: inherit; z-index: 2;
}
.date-input::-webkit-calendar-picker-indicator { opacity: 0; width: 100%; height: 100%; position: absolute; cursor: pointer; }
.date-today-btn {
    cursor: pointer; font-size: 10px !important; gap: 3px !important;
    color: var(--cyan) !important; border-color: var(--cyan-dim) !important;
    background: var(--cyan-glow) !important;
    transition: all var(--transition);
}
.date-today-btn:hover { background: var(--cyan-dim) !important; }

/* Dropout Prediction Card */
#dropout-prediction-card .card-header {
    display: flex; justify-content: space-between; align-items: center;
}

/* ═══════════ PAGE SYSTEM ═══════════ */
.page {
    display: none; padding: 20px 24px; overflow-y: auto; flex: 1;
    animation: pageFade 0.4s var(--ease);
}
.page.active { display: block; }
@keyframes pageFade {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ═══════════ METRIC CARDS ═══════════ */
.metrics-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 16px; }
.metric-card {
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius); display: flex; align-items: center; gap: 14px;
    padding: 16px 18px; position: relative; overflow: hidden;
    transition: all var(--transition);
}
.metric-card:hover { border-color: var(--border-strong); box-shadow: var(--glow-cyan); transform: translateY(-1px); }
.mc-icon-bar {
    position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
}
.mc-icon-bar.blue { background: var(--blue); }
.mc-icon-bar.green { background: var(--green); }
.mc-icon-bar.amber { background: var(--amber); }
.mc-icon-bar.red { background: var(--red); }
.mc-body { flex: 1; padding-left: 8px; }
.mc-label {
    font-family: 'JetBrains Mono', monospace; font-size: 9.5px; font-weight: 600;
    color: var(--text-muted); text-transform: uppercase; letter-spacing: 1.5px;
}
.mc-value {
    font-family: 'JetBrains Mono', monospace; font-size: 30px; font-weight: 800;
    letter-spacing: -1px; margin-top: 2px; line-height: 1.1;
}
.mc-icon-wrap {
    width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
    color: var(--text-dim);
}
.mc-icon-wrap i { width: 20px; height: 20px; }
/* compat: old icon classes */
.mc-icon { display: none; }

/* ═══════════ CARDS ═══════════ */
.card {
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius); overflow: hidden;
}
.card-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 12px 16px; border-bottom: 1px solid var(--border);
}
.card-header h3 {
    font-family: 'Outfit', sans-serif; font-size: 13px; font-weight: 600;
    display: flex; align-items: center; gap: 7px; color: var(--text-secondary);
}
.badge-small {
    font-family: 'JetBrains Mono', monospace; padding: 2px 8px; border-radius: var(--radius-xs);
    font-size: 9px; font-weight: 700; background: var(--cyan-dim); color: var(--cyan);
    text-transform: uppercase; letter-spacing: 1px;
}
.live-badge {
    display: inline-flex; align-items: center; gap: 5px;
    background: var(--green-dim); color: var(--green);
}

/* ═══════════ CHARTS ═══════════ */
.charts-row { display: grid; grid-template-columns: 2fr 1fr; gap: 12px; margin-bottom: 16px; }
.chart-card, .chart-card-sm { min-height: 270px; }
.chart-container { padding: 14px; height: 230px; }
.chart-container-sm { padding: 14px; height: 210px; }
.chart-toggle { display: flex; gap: 3px; }
.toggle-btn {
    font-family: 'JetBrains Mono', monospace; padding: 3px 9px; border-radius: var(--radius-xs);
    font-size: 10px; font-weight: 700; border: 1px solid var(--border);
    background: none; color: var(--text-muted); cursor: pointer; transition: all var(--transition);
    letter-spacing: 0.5px;
}
.toggle-btn.active, .toggle-btn:hover {
    background: var(--cyan-dim); color: var(--cyan); border-color: var(--border-strong);
}

/* ═══════════ DASHBOARD BOTTOM ═══════════ */
.dashboard-bottom { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Schedule List */
.schedule-list { padding: 6px; max-height: 300px; overflow-y: auto; }
.schedule-item {
    display: flex; align-items: center; gap: 10px;
    padding: 9px 10px; border-radius: var(--radius-sm);
    transition: background var(--transition); border-left: 2px solid transparent;
}
.schedule-item:hover { background: var(--bg-surface-hover); }
.schedule-item.current {
    background: var(--cyan-dim); border-left-color: var(--cyan);
    box-shadow: inset 0 0 20px rgba(0, 240, 255, 0.03);
}
.schedule-time {
    font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 600;
    color: var(--text-muted); min-width: 88px;
}
.schedule-subject { font-size: 13px; font-weight: 600; flex: 1; color: var(--text); }
.schedule-room { font-family: 'JetBrains Mono', monospace; font-size: 10.5px; color: var(--text-muted); }
.schedule-status-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
.schedule-status-dot.active { background: var(--green); box-shadow: 0 0 6px rgba(0,230,118,0.4); animation: pulse-ring 2.5s infinite; }
.schedule-status-dot.upcoming { background: var(--amber); }
.schedule-status-dot.done { background: var(--text-dim); }

/* Scan Feed */
.scan-feed { padding: 6px; max-height: 300px; overflow-y: auto; display: flex; flex-direction: column; gap: 3px; }
.scan-item {
    display: flex; align-items: center; gap: 8px;
    padding: 8px 10px; border-radius: var(--radius-sm);
    animation: scanSlide 0.3s var(--ease); font-size: 12px;
    border-left: 2px solid var(--text-muted);
}
.scan-item:hover { background: var(--bg-surface-hover); }
@keyframes scanSlide { from { opacity: 0; transform: translateX(-8px); } to { opacity: 1; transform: translateX(0); } }
.scan-avatar { width: 24px; height: 24px; border-radius: 50%; flex-shrink: 0; object-fit: cover; border: 1px solid var(--border); }
.scan-time { font-family: 'JetBrains Mono', monospace; color: var(--text-muted); font-weight: 500; min-width: 55px; font-size: 10.5px; }
.scan-name { font-weight: 600; flex: 1; }
.scan-subject { color: var(--cyan); font-weight: 500; font-size: 11px; }

/* ═══════════ TABLE ═══════════ */
.table-wrap { overflow-x: auto; max-height: calc(100vh - 260px); overflow-y: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 9px 14px; text-align: left; font-size: 12px; border-bottom: 1px solid var(--border); }
th {
    font-family: 'JetBrains Mono', monospace; font-weight: 700; color: var(--text-muted);
    font-size: 10px; text-transform: uppercase; letter-spacing: 1.5px;
    position: sticky; top: 0; background: var(--bg-surface); z-index: 1;
}
td { color: var(--text-secondary); }
tr:hover td { background: var(--bg-surface-hover); }

/* ═══════════ BADGES ═══════════ */
.badge {
    display: inline-block; padding: 2px 8px; border-radius: var(--radius-xs);
    font-family: 'JetBrains Mono', monospace; font-size: 9.5px; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.5px;
}
.badge.present, .badge.valid { background: var(--green-dim); color: var(--green); }
.badge.late { background: var(--amber-dim); color: var(--amber); }
.badge.absent, .badge.invalid { background: var(--red-dim); color: var(--red); }
.badge.duplicate { background: var(--amber-dim); color: var(--amber); }
.badge.unregistered { background: rgba(168,85,247,0.1); color: #a78bfa; }
.badge.info { background: var(--blue-dim); color: var(--blue); }

.empty-state, .empty-state-sm {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    color: var(--text-dim); font-size: 12px; gap: 6px;
    font-family: 'JetBrains Mono', monospace; letter-spacing: 0.3px;
}
.empty-state { padding: 40px 20px; }
.empty-state-sm { padding: 20px 14px; }

/* ═══════════ TOOLBAR ═══════════ */
.page-toolbar { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.search-box {
    display: flex; align-items: center; gap: 8px;
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 7px 12px; flex: 1; max-width: 320px;
    transition: border-color var(--transition);
}
.search-box:focus-within { border-color: var(--cyan); box-shadow: 0 0 0 2px var(--cyan-dim); }
.search-box input { background: none; border: none; color: var(--text); font-size: 12.5px; width: 100%; }
.search-box input::placeholder { color: var(--text-dim); }
.search-box i { color: var(--text-muted); }
.filter-select {
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 7px 12px; color: var(--text-secondary);
    font-size: 12px; cursor: pointer; transition: border-color var(--transition);
}
.filter-select:focus { border-color: var(--cyan); }
.date-range { display: flex; align-items: center; gap: 7px; }
.date-range label {
    font-family: 'JetBrains Mono', monospace; font-size: 9.5px; color: var(--text-dim);
    font-weight: 600; text-transform: uppercase; letter-spacing: 1px;
}
.date-range input {
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 6px 10px; color: var(--text-secondary); font-size: 11.5px;
}
.btn-outline {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 7px 12px; background: none; border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm); color: var(--cyan);
    font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 600;
    cursor: pointer; transition: all var(--transition); letter-spacing: 0.3px;
}
.btn-outline:hover { background: var(--cyan-dim); border-color: var(--cyan); }
/* compat */
.btn-secondary { 
    display: inline-flex; align-items: center; gap: 5px;
    padding: 7px 12px; background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius-sm); color: var(--text-secondary);
    font-size: 11px; font-weight: 600; cursor: pointer; transition: all var(--transition);
}
.btn-secondary:hover { border-color: var(--cyan); color: var(--cyan); }

/* ═══════════ STUDENTS GRID ═══════════ */
.students-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 12px; }
.student-card {
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 16px; cursor: pointer;
    transition: all var(--transition); position: relative;
}
.student-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, var(--cyan), transparent); opacity: 0;
    transition: opacity var(--transition); border-radius: var(--radius) var(--radius) 0 0;
}
.student-card:hover { border-color: var(--border-strong); transform: translateY(-2px); box-shadow: var(--glow-cyan); }
.student-card:hover::before { opacity: 1; }
.student-card.at-risk { border-color: rgba(255,61,87,0.2); }
.student-card.at-risk::before { background: linear-gradient(90deg, var(--red), transparent); opacity: 0.6; }
.student-top { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.student-avatar {
    width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-family: 'JetBrains Mono', monospace; font-size: 14px; font-weight: 700; color: #fff; flex-shrink: 0;
    overflow: hidden; border: 2px solid var(--border-strong);
}
.student-avatar img {
    width: 100%; height: 100%; object-fit: cover; border-radius: 50%;
}
.student-info h4 { font-family: 'Outfit', sans-serif; font-size: 14px; font-weight: 600; color: var(--text); }
.student-info p { font-size: 11px; color: var(--text-muted); display: flex; align-items: center; gap: 4px; }
.student-info .uid-mono { font-family: 'JetBrains Mono', monospace; font-size: 10.5px; color: var(--text-muted); }
.student-stats { display: flex; gap: 14px; }
.student-stat { text-align: center; }
.student-stat .val { font-family: 'JetBrains Mono', monospace; font-size: 15px; font-weight: 800; }
.student-stat .lbl {
    font-family: 'JetBrains Mono', monospace; font-size: 9px; color: var(--text-dim);
    text-transform: uppercase; letter-spacing: 1px;
}

/* ═══════════ FORMS ═══════════ */
.sim-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.sim-desc { padding: 10px 16px 0; font-size: 11.5px; color: var(--text-muted); line-height: 1.6; }
.sim-form { padding: 12px 16px 16px; display: flex; flex-direction: column; gap: 7px; }
.sim-form label {
    font-family: 'JetBrains Mono', monospace; font-size: 10px; font-weight: 700;
    color: var(--text-muted); text-transform: uppercase; letter-spacing: 1.2px; margin-top: 2px;
}
.form-input {
    background: var(--bg-base); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 8px 12px; color: var(--text);
    font-size: 12.5px; transition: all var(--transition);
}
.form-input:focus { border-color: var(--cyan); box-shadow: 0 0 0 2px var(--cyan-dim); }
.form-input[readonly] { background: var(--bg-surface-hover); color: var(--text-muted); cursor: not-allowed; }
.mono-input { font-family: 'JetBrains Mono', monospace; letter-spacing: 1.5px; font-weight: 600; }
.btn-primary {
    display: inline-flex; align-items: center; justify-content: center; gap: 7px;
    padding: 8px 16px; background: var(--cyan); color: var(--bg-base);
    border: none; border-radius: var(--radius-sm);
    font-family: 'JetBrains Mono', monospace; font-size: 11.5px; font-weight: 700;
    cursor: pointer; transition: all var(--transition); margin-top: 4px;
    letter-spacing: 0.5px; text-transform: uppercase;
}
.btn-primary:hover { filter: brightness(1.15); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,240,255,0.2); }
.btn-primary:active { transform: translateY(0); }
.btn-green { background: var(--green); }
.btn-green:hover { box-shadow: 0 4px 16px rgba(0,230,118,0.2); }
.btn-amber { background: var(--amber); color: #1a1a1a; }
.btn-amber:hover { box-shadow: 0 4px 16px rgba(255,184,0,0.2); }
.sim-result { padding: 4px 0; font-family: 'JetBrains Mono', monospace; font-size: 11px; min-height: 18px; }
.sim-result.success { color: var(--green); }
.sim-result.error { color: var(--red); }
.enrollment-form .enrollment-row { display: grid; grid-template-columns: 1fr 1fr auto; gap: 10px; align-items: end; }
.enrollment-list { padding: 10px 16px; max-height: 200px; overflow-y: auto; }

/* ═══════════ SCHEDULE PAGE ═══════════ */
.schedule-layout { display: grid; grid-template-columns: 2fr 1fr; gap: 14px; }
.timetable-card { min-height: 400px; }
.timetable-grid { padding: 14px; overflow-x: auto; }
.tt-table { width: 100%; border-collapse: collapse; font-size: 11px; table-layout: fixed; }
.tt-table th {
    font-family: 'JetBrains Mono', monospace; padding: 10px 5px; text-align: center;
    font-weight: 700; color: var(--text-muted); font-size: 10px; text-transform: uppercase;
    letter-spacing: 1.5px; border-bottom: 1px solid var(--border); position: relative;
}
.tt-time-col { width: 80px !important; }
.tt-today-col {
    color: var(--cyan) !important;
    background: var(--cyan-glow);
}
.tt-today-dot {
    display: inline-block; width: 5px; height: 5px; border-radius: 50%;
    background: var(--cyan); margin-left: 3px; vertical-align: middle;
    box-shadow: 0 0 6px rgba(0,240,255,0.5);
    animation: pulse-ring 2s infinite;
}
.tt-day-count {
    display: inline-flex; align-items: center; justify-content: center;
    background: var(--cyan-dim); color: var(--cyan); border-radius: 50%;
    width: 16px; height: 16px; font-size: 8px; font-weight: 800;
    margin-left: 4px; vertical-align: middle;
}
.tt-table td {
    padding: 4px; text-align: center; border-bottom: 1px solid var(--border);
    vertical-align: top; height: 62px; transition: background var(--transition);
}
.tt-time-label {
    font-family: 'JetBrains Mono', monospace !important;
    font-size: 10.5px !important; color: var(--text-muted) !important;
    font-weight: 700 !important; white-space: nowrap;
}
.tt-today-cell {
    background: rgba(0, 240, 255, 0.02) !important;
    border-left: 1px solid rgba(0, 240, 255, 0.06);
    border-right: 1px solid rgba(0, 240, 255, 0.06);
}

/* Slots — color set dynamically via JS */
.tt-slot {
    border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
    padding: 6px 8px; cursor: pointer; transition: all 0.2s var(--ease);
    position: relative; min-height: 48px;
}
.tt-slot:hover {
    transform: scale(1.05); z-index: 2;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    filter: brightness(1.15);
}
.tt-slot:active { transform: scale(0.98); }
.tt-slot .tt-subj { font-family: 'JetBrains Mono', monospace; font-weight: 800; font-size: 11px; }
.tt-slot .tt-time { font-size: 9px; color: var(--text-muted); margin-top: 1px; }
.tt-slot .tt-room { font-size: 9px; color: var(--text-muted); }

/* Active slot (currently in progress) */
.tt-slot-active {
    animation: slotGlow 2s ease-in-out infinite alternate;
    box-shadow: 0 0 12px rgba(0, 240, 255, 0.15);
}
@keyframes slotGlow {
    0% { box-shadow: 0 0 8px rgba(0, 240, 255, 0.1); }
    100% { box-shadow: 0 0 20px rgba(0, 240, 255, 0.25); }
}
.tt-live-badge {
    position: absolute; top: 2px; right: 3px;
    font-family: 'JetBrains Mono', monospace; font-size: 7px; font-weight: 800;
    color: var(--green); background: var(--green-dim);
    padding: 1px 4px; border-radius: 2px; letter-spacing: 0.5px;
    animation: pulse-ring 2s infinite;
}

/* Empty cell — click-to-add */
.tt-empty-cell { cursor: pointer; position: relative; }
.tt-empty-cell:hover { background: var(--cyan-glow) !important; }
.tt-add-hint {
    display: none; font-family: 'JetBrains Mono', monospace;
    font-size: 18px; font-weight: 300; color: var(--text-dim);
    position: absolute; inset: 0; display: flex; align-items: center;
    justify-content: center; opacity: 0; transition: opacity var(--transition);
}
.tt-empty-cell:hover .tt-add-hint { opacity: 1; color: var(--cyan); }

/* Sidebar lists */
.schedule-sidebar { display: flex; flex-direction: column; gap: 12px; }
.schedule-sidebar .card { transition: box-shadow 0.5s ease, border-color 0.5s ease; }
.subject-list, .holiday-list { padding: 6px 16px 12px; display: flex; flex-direction: column; gap: 3px; max-height: 170px; overflow-y: auto; }
.subject-item, .holiday-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 6px 10px; border-radius: var(--radius-xs); font-size: 12px;
    transition: background var(--transition);
}
.subject-item:hover, .holiday-item:hover { background: var(--bg-surface-hover); }
.del-btn { background: none; border: none; color: var(--red); cursor: pointer; opacity: 0.4; transition: opacity var(--transition); padding: 2px; }
.del-btn:hover { opacity: 1; }

/* ═══════════ ANALYTICS ═══════════ */
.analytics-sections { display: flex; flex-direction: column; gap: 20px; }
.analytics-sections .insights-summary { margin-bottom: 0; }
.analytics-sections .charts-row { margin-bottom: 0; }
.insights-summary { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 16px; }
.insight-stat {
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 18px; text-align: center;
}
.insight-stat h2 {
    font-family: 'JetBrains Mono', monospace; font-size: 28px; font-weight: 800; letter-spacing: -1px;
}
.insight-stat p {
    font-family: 'JetBrains Mono', monospace; font-size: 9.5px; color: var(--text-dim);
    margin-top: 3px; text-transform: uppercase; letter-spacing: 1.5px; font-weight: 600;
}
.insight-stat.accent { border-color: var(--border-strong); background: linear-gradient(135deg, var(--cyan-dim), var(--bg-surface)); }
.insight-stat.accent h2 { color: var(--cyan); text-shadow: 0 0 20px rgba(0,240,255,0.2); }

/* ═══════════ SETTINGS ═══════════ */
.settings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.settings-group { padding: 12px 16px 16px; display: flex; flex-direction: column; gap: 7px; }
.settings-group label {
    font-family: 'JetBrains Mono', monospace; font-size: 10px; font-weight: 700;
    color: var(--text-muted); text-transform: uppercase; letter-spacing: 1.2px; margin-top: 3px;
}
.arch-flow { display: flex; align-items: center; justify-content: center; gap: 8px; padding: 18px; flex-wrap: wrap; }
.arch-node {
    font-family: 'JetBrains Mono', monospace; padding: 8px 14px; border-radius: var(--radius-sm);
    font-size: 10.5px; font-weight: 700; border: 1px solid var(--border); letter-spacing: 0.3px;
}
.arch-node.edge { background: var(--amber-dim); color: var(--amber); border-color: rgba(255,184,0,0.3); }
.arch-node.api { background: var(--blue-dim); color: var(--blue); border-color: rgba(61,139,253,0.3); }
.arch-node.db { background: var(--green-dim); color: var(--green); border-color: rgba(0,230,118,0.3); }
.arch-node.dash { background: var(--cyan-dim); color: var(--cyan); border-color: rgba(0,240,255,0.3); }
.arch-node.ml { background: var(--red-dim); color: var(--red); border-color: rgba(255,61,87,0.3); }
.arch-arrow { font-family: 'JetBrains Mono', monospace; color: var(--text-muted); font-size: 16px; }
.about-content { padding: 14px 16px; font-size: 13px; line-height: 1.7; color: var(--text-secondary); }
.about-content strong { color: var(--text); }
.tech-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 10px; }
.tag {
    font-family: 'JetBrains Mono', monospace; padding: 3px 8px; border-radius: var(--radius-xs);
    font-size: 9px; font-weight: 700; background: var(--cyan-dim); color: var(--cyan);
    text-transform: uppercase; letter-spacing: 1px; border: 1px solid var(--border);
}

/* ═══════════ TOAST ═══════════ */
.toast-container { position: fixed; top: 16px; right: 16px; z-index: 9999; display: flex; flex-direction: column; gap: 6px; pointer-events: none; }
.toast {
    padding: 10px 16px; border-radius: var(--radius-sm); font-size: 12px; font-weight: 500;
    display: flex; align-items: center; gap: 8px; animation: toastIn 0.3s var(--ease);
    pointer-events: auto; border: 1px solid var(--border); min-width: 260px;
    font-family: 'DM Sans', sans-serif; backdrop-filter: blur(12px);
}
.toast.success { background: rgba(0,230,118,0.1); color: var(--green); border-color: rgba(0,230,118,0.2); }
.toast.error { background: rgba(255,61,87,0.1); color: var(--red); border-color: rgba(255,61,87,0.2); }
.toast.info { background: rgba(0,240,255,0.08); color: var(--cyan); border-color: rgba(0,240,255,0.15); }
.toast.out { animation: toastOut 0.3s var(--ease) forwards; }
@keyframes toastIn { from { opacity: 0; transform: translateX(30px); } to { opacity: 1; transform: translateX(0); } }
@keyframes toastOut { from { opacity: 1; transform: translateX(0); } to { opacity: 0; transform: translateX(30px); } }

/* ═══════════ MODAL ═══════════ */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.75); z-index: 1000;
    display: none; align-items: center; justify-content: center; backdrop-filter: blur(6px);
}
.modal-overlay.active { display: flex; }
.modal-content {
    background: var(--bg-raised); border: 1px solid var(--border-strong);
    border-radius: var(--radius); width: 90%; max-width: 580px; max-height: 80vh;
    overflow: hidden; animation: modalIn 0.3s var(--ease); box-shadow: var(--shadow-lg);
}
@keyframes modalIn { from { opacity: 0; transform: scale(0.96) translateY(8px); } to { opacity: 1; transform: scale(1) translateY(0); } }
.modal-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 14px 18px; border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-family: 'Outfit', sans-serif; font-size: 15px; font-weight: 700; }
.modal-close {
    background: none; border: none; color: var(--text-muted); cursor: pointer;
    padding: 4px; border-radius: var(--radius-xs); transition: all var(--transition);
}
.modal-close:hover { color: var(--text); background: var(--bg-surface-hover); }
.modal-body { padding: 18px; overflow-y: auto; max-height: 60vh; }

/* ═══════════ SCROLLBAR ═══════════ */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

/* ═══════════ RESPONSIVE ═══════════ */
@media (max-width: 1200px) {
    .metrics-row { grid-template-columns: repeat(2, 1fr); }
    .charts-row { grid-template-columns: 1fr; }
    .schedule-layout { grid-template-columns: 1fr; }
    .insights-summary { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .sidebar { position: fixed; left: 0; top: 0; height: 100%; transform: translateX(-100%); z-index: 100; }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay.active { display: block; }
    .hamburger { display: flex; }
    .page { padding: 14px; }
    .topbar { padding: 10px 14px; }
    .sim-grid { grid-template-columns: 1fr; }
    .sim-grid .card[style*="span 2"] { grid-column: span 1; }
    .settings-grid { grid-template-columns: 1fr; }
    .dashboard-bottom { grid-template-columns: 1fr; }
    .enrollment-form .enrollment-row { grid-template-columns: 1fr; }
    .topbar-right { display: none; }
}
@media (max-width: 480px) {
    .metrics-row { grid-template-columns: 1fr; }
    .students-grid { grid-template-columns: 1fr; }
    .page-toolbar { flex-direction: column; align-items: stretch; }
    .search-box { max-width: 100%; }
}