:root {
    --blue: #006EFF;
    --blue-dark: #0058cc;
    --blue-deep: #0047b3;
    --blue-soft: #e8f3ff;
    --blue-mid: #b3d4ff;
    --white: #FFFFFF;
    --text: #0047b3;
    --muted: #3d7ad1;
    --border: #cfe3ff;
    --bg: #f4f8ff;
    --shadow: 0 8px 24px rgba(0, 110, 255, 0.12);
    --radius: 12px;
    --sidebar: 248px;
    --font: "Source Sans 3", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
    font-family: var(--font);
    color: var(--text);
    background: var(--white);
}

a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); }

.ih-wrap { min-height: 100vh; background: var(--white); }
.ih-nav {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 7%; background: var(--white);
    border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--blue); font-weight: 700; font-size: 1.12rem; letter-spacing: -.01em; }
.brand-mark {
    width: 38px; height: 38px; border-radius: 12px;
    background: var(--blue);
    color: var(--white); display: grid; place-items: center;
}
.brand-mark svg { display: block; }
.brand-mark .logo-cut { fill: #006EFF; }
.sidebar .brand-mark .logo-cut { fill: #FFFFFF; }
.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a { color: var(--blue); font-weight: 600; }
.nav-links a.btn,
.nav-links a.btn-primary,
a.btn-primary,
.btn-primary {
    color: #FFFFFF !important;
}

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    border: 0; border-radius: 999px; padding: 10px 18px; font-weight: 600;
    cursor: pointer; font-family: inherit; letter-spacing: .01em;
}
.btn-primary { background: var(--blue); color: var(--white); }
.btn-primary:hover { background: var(--blue-dark); color: #FFFFFF !important; }
.btn-outline { background: var(--white); color: var(--blue); border: 1px solid var(--blue); }
.btn-outline:hover { background: var(--blue-soft); color: var(--blue-dark); }
.btn-ghost { background: transparent; color: var(--blue); }
.btn-danger { background: var(--white); color: var(--blue); border: 1px solid var(--blue); }
.btn-sm { padding: 6px 11px; font-size: .85rem; }
.btn-block { width: 100%; }

.hero {
    display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center;
    padding: 72px 7% 56px; background: var(--white);
}
.hero h1 { font-size: clamp(2rem, 3.6vw, 3.1rem); line-height: 1.2; color: var(--blue); margin: 0 0 16px; font-weight: 700; }
.hero p.lead { font-size: 1.08rem; color: var(--muted); max-width: 540px; line-height: 1.6; }
.hero-card {
    background: var(--white); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); padding: 28px;
}
.feature-grid, .stat-grid, .cards-4 { display: grid; gap: 16px; }
.feature-grid { grid-template-columns: repeat(3, 1fr); padding: 12px 7% 72px; }
.card, .panel {
    background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: none;
}
.card { padding: 22px; }
.card h3 { margin-top: 0; color: var(--blue); font-weight: 700; }
.muted { color: var(--muted); }
.section-title { padding: 0 7%; color: var(--blue); font-weight: 700; }

.app-shell { display: grid; grid-template-columns: var(--sidebar) 1fr; min-height: 100vh; background: var(--bg); }
.sidebar {
    background: var(--blue); color: var(--white); padding: 22px 14px; position: sticky; top: 0; height: 100vh;
}
.sidebar .brand { color: var(--white); margin-bottom: 28px; }
.sidebar .brand-mark { background: var(--white); color: var(--blue); }
.sidebar a {
    display: flex; align-items: center; gap: 10px; color: var(--white); padding: 10px 14px; border-radius: 999px; font-weight: 600;
}
.sidebar a.active, .sidebar a:hover { background: var(--white); color: var(--blue); }
.sidebar-footer { margin-top: auto; }
.sidebar nav { display: flex; flex-direction: column; gap: 2px; height: calc(100% - 80px); }
.sidebar .btn-ghost { color: var(--white); }
.sidebar .btn-ghost:hover { color: var(--blue); background: var(--white); }
.content { padding: 28px; }
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 22px; gap: 16px; }
.page-header h1 { margin: 0; color: var(--blue); font-size: 1.5rem; font-weight: 700; }

.cards-4 { grid-template-columns: repeat(4, 1fr); margin-bottom: 22px; }
.stat-card { padding: 18px 20px; background: var(--white); }
.stat-card span { color: var(--muted); font-size: .78rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
.stat-card strong { display: block; font-size: 1.75rem; color: var(--blue); margin-top: 6px; }

.table-wrap { overflow: auto; }
table.data { width: 100%; border-collapse: collapse; }
table.data th, table.data td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); }
table.data th { font-size: .75rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.badge {
    display: inline-flex; align-items: center; border-radius: 999px; padding: 3px 10px; font-size: .74rem; font-weight: 700;
    background: var(--blue-soft); color: var(--blue);
}
.badge-scheduled { background: var(--blue-soft); color: var(--blue); }
.badge-waiting { background: var(--white); color: var(--blue); border: 1px solid var(--blue); }
.badge-ongoing { background: var(--blue); color: var(--white); }
.badge-completed { background: var(--blue-mid); color: var(--blue-dark); }
.badge-cancelled, .badge-expired { background: var(--white); color: var(--blue); border: 1px solid var(--blue-mid); }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-grid .full { grid-column: 1 / -1; }
label { display: block; font-weight: 700; margin-bottom: 6px; color: var(--blue); }
input, select {
    width: 100%; border: 1px solid var(--border); border-radius: 999px; padding: 10px 16px; font: inherit; background: var(--white); color: var(--blue-dark);
}
textarea {
    width: 100%; border: 1px solid var(--border); border-radius: 24px; padding: 12px 16px; font: inherit; background: var(--white); color: var(--blue-dark); min-height: 120px;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--blue-mid); border-color: var(--blue); }
.help { font-size: .85rem; color: var(--muted); margin-top: 6px; }
.alert {
    border-radius: 6px; padding: 12px 14px; margin-bottom: 16px; border: 1px solid var(--border); background: var(--white); color: var(--blue);
}
.alert-success { background: var(--blue-soft); border-color: var(--blue-mid); color: var(--blue-dark); }
.alert-error { background: var(--white); border-color: var(--blue); color: var(--blue); }
.auth-card { max-width: 440px; margin: 64px auto; padding: 32px; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.calendar { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; }
.cal-day { min-height: 110px; background: var(--white); border: 1px solid var(--border); border-radius: 8px; padding: 8px; }
.cal-day strong { color: var(--blue); }
.event { display: block; font-size: .75rem; background: var(--blue-soft); color: var(--blue); border-radius: 4px; padding: 4px 6px; margin-top: 6px; }

.waiting-layout { max-width: 980px; margin: 32px auto; display: grid; grid-template-columns: 1.1fr .9fr; gap: 20px; }
.preview-box { background: var(--blue); border-radius: 10px; min-height: 280px; position: relative; overflow: hidden; }
.preview-box video { width: 100%; height: 100%; object-fit: cover; }
.device-row { display: flex; gap: 10px; margin-top: 12px; }
.room-shell { height: 100vh; display: grid; grid-template-rows: auto 1fr auto; background: var(--blue); color: var(--white); position: relative; }
.room-top { display: flex; justify-content: space-between; align-items: center; padding: 12px 18px; background: var(--blue-dark); }
.room-body { min-height: 0; height: 100%; display: flex; }
.room-stage { position: relative; flex: 1; min-width: 280px; min-height: 0; }
.video-grid {
    position: relative; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
    background: #0b1526; overflow: hidden;
}
.video-tile {
    position: relative; overflow: hidden; background: #111d33; display: flex; align-items: center; justify-content: center;
}
.remote-tile {
    width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
}
.remote-tile video {
    width: 100%; height: 100%; object-fit: contain; background: #000;
}
.remote-tile.has-video #remote-placeholder { display: none; }
.remote-tile.has-video video { display: block; }
.video-tile-avatar {
    font-size: 5rem; opacity: 0.35; user-select: none;
}
.local-tile {
    position: absolute; right: 20px; bottom: 20px; width: 220px; height: 140px; border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5); border: 2px solid rgba(255,255,255,0.25); z-index: 10;
    background: #182234; overflow: hidden;
}
.local-tile video {
    width: 100%; height: 100%; object-fit: cover; transform: scaleX(-1);
}
.video-tile-badge {
    position: absolute; bottom: 8px; left: 8px; background: rgba(0,0,0,0.65);
    color: #fff; padding: 3px 8px; border-radius: 6px; font-size: 0.75rem; font-weight: 600;
    pointer-events: none; z-index: 5;
}
.chat-panel {
    position: absolute; right: 0; top: 0; bottom: 0; width: 320px; background: #ffffff; color: #1e293b;
    box-shadow: -4px 0 20px rgba(0,0,0,0.25); z-index: 25; display: flex; flex-direction: column;
    transform: translateX(100%); transition: transform 0.2s ease;
}
.chat-panel.open {
    transform: translateX(0);
}
.chat-head {
    display: flex; align-items: center; justify-content: space-between; padding: 12px 16px;
    border-bottom: 1px solid #e2e8f0; background: #f8fafc;
}
.chat-messages {
    flex: 1; overflow-y: auto; padding: 12px 16px; display: flex; flex-direction: column; gap: 8px;
}
.chat-bubble {
    max-width: 80%; padding: 8px 12px; border-radius: 10px; font-size: 0.85rem; line-height: 1.35;
}
.chat-bubble.mine {
    align-self: flex-end; background: #2563eb; color: #ffffff;
}
.chat-bubble.theirs {
    align-self: flex-start; background: #f1f5f9; color: #0f172a;
}
.chat-bubble .sender-name {
    font-size: 0.7rem; opacity: 0.8; font-weight: 700; margin-bottom: 2px;
}
.chat-input-bar {
    display: flex; gap: 8px; padding: 10px 12px; border-top: 1px solid #e2e8f0; background: #ffffff;
}
.chat-input-bar input {
    flex: 1; border: 1px solid #cbd5e1; border-radius: 8px; padding: 8px 12px; font-size: 0.85rem;
}
.btn-control-active {
    background: #ef4444 !important; color: #ffffff !important; border-color: #ef4444 !important;
}
.coding-pane {
    width: 46%; min-width: 340px; max-width: 720px; background: var(--white); color: var(--blue);
    display: flex; flex-direction: column; min-height: 0; border-left: 1px solid rgba(255,255,255,.3);
}
.coding-pane.collapsed, .coding-collapsed .coding-pane { display: none !important; width: 0; min-width: 0; }
.room-shell.coding-collapsed .room-stage { flex: 1 1 100%; width: 100%; }
.coding-head { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--border); }
.coding-head strong { margin-right: auto; }
.coding-label { font-size: .75rem; font-weight: 700; padding: 8px 12px 0; }
.coding-pane textarea {
    margin: 6px 12px; width: calc(100% - 24px); border: 1px solid var(--border); border-radius: 16px;
    color: var(--blue); background: var(--white);
}
#coding-editor { flex: 1; min-height: 180px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; }
.coding-toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 0 12px 6px; }
.coding-toolbar select { width: auto; min-width: 140px; }
.coding-lock { display: flex; gap: 6px; align-items: center; font-weight: 700; font-size: .85rem; }
.coding-sandbox { height: 110px; margin: 0 12px 8px; border: 1px solid var(--border); border-radius: 12px; background: var(--white); }
.coding-events { margin: 0 12px 8px; max-height: 90px; overflow: auto; font-size: 11px; color: var(--blue); background: var(--blue-soft); border-radius: 10px; padding: 8px; }
.coding-note { font-size: .72rem; line-height: 1.4; margin: 0 12px 12px; color: var(--muted); }
@media (max-width: 980px) {
    .room-body.has-coding { flex-direction: column; }
    .coding-pane { width: 100%; max-width: none; min-width: 0; height: 48%; border-left: 0; border-top: 1px solid var(--border); }
}
.room-controls { display: flex; justify-content: center; gap: 10px; padding: 14px; background: var(--blue-dark); }
.notes-panel {
    position: fixed; right: 0; top: 0; width: 360px; height: 100%; background: var(--white); color: var(--text);
    transform: translateX(100%); transition: .25s ease; z-index: 30; padding: 18px; overflow: auto; border-left: 1px solid var(--border);
}
.notes-panel.open { transform: none; }
.consent-modal {
    position: fixed; inset: 0; background: rgba(0, 110, 255, .45); display: none; place-items: center; z-index: 40; padding: 20px;
}
.consent-modal.open { display: grid; }

input[type=checkbox], input[type=radio] {
    width: auto; height: auto; border-radius: 4px; padding: 0; accent-color: var(--blue);
}

.eyebrow { font-weight: 700; letter-spacing: .12em; text-transform: uppercase; font-size: .75rem; color: var(--muted); margin: 0 0 12px; }
.hero { padding: 80px 7% 64px; }
.hero h1 { font-size: clamp(2.3rem, 4.2vw, 3.5rem); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.meet-mock { background: var(--blue); border-radius: 18px; overflow: hidden; color: var(--white); box-shadow: var(--shadow); }
.meet-bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; background: rgba(255,255,255,.12); font-size: .85rem; }
.meet-bar em { margin-left: auto; font-style: normal; opacity: .85; }
.meet-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--white); opacity: .7; }
.meet-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; padding: 14px; min-height: 220px; }
.meet-tile { background: rgba(255,255,255,.16); border-radius: 14px; display: grid; place-items: center; font-weight: 700; }
.meet-tile.alt { background: rgba(255,255,255,.28); }
.meet-controls { display: flex; justify-content: center; gap: 10px; padding: 12px 16px 16px; }
.meet-controls span { background: var(--white); color: var(--blue); border-radius: 999px; padding: 6px 12px; font-size: .8rem; font-weight: 700; }
.trust-bar { background: var(--blue-soft); padding: 28px 7%; text-align: center; }
.trust-bar p { font-weight: 700; color: var(--blue); margin: 0 0 12px; }
.trust-items { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.trust-items span { background: var(--white); color: var(--blue); border-radius: 999px; padding: 8px 14px; font-weight: 600; font-size: .88rem; }
.steps-wrap { padding: 56px 7%; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.step-num { display: inline-block; color: var(--blue); font-weight: 700; margin-bottom: 8px; }
.cta-band { margin: 12px 7% 64px; padding: 36px; border-radius: 20px; background: var(--blue); color: var(--white); display: flex; justify-content: space-between; gap: 24px; align-items: center; flex-wrap: wrap; }
.cta-band h2 { margin: 0 0 8px; color: var(--white); }
.cta-band p { margin: 0; color: var(--white); opacity: .92; }
.cta-band .btn-outline { border-color: var(--white); color: var(--white); background: transparent; }
.cta-band .btn-primary { background: var(--white); color: var(--blue) !important; }
.site-footer { background: var(--blue); color: var(--white); padding: 48px 7% 24px; margin-top: 24px; }
.site-footer .brand, .site-footer a, .site-footer .muted { color: var(--white); }
.site-footer .brand-mark { background: var(--white); color: var(--blue); }
.site-footer .brand-mark .logo-cut { fill: #FFFFFF; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; }
.footer-grid h4 { margin: 0 0 12px; }
.footer-grid a { display: block; margin: 8px 0; font-weight: 600; opacity: .92; }
.footer-bottom { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 32px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.25); font-size: .9rem; }
.legal-page { max-width: 820px; margin: 48px auto 72px; padding: 0 24px; }
.legal-page h1 { color: var(--blue); font-size: 2.2rem; }
.legal-page h2 { color: var(--blue); margin-top: 28px; }
.legal-page p { line-height: 1.65; }
.app-topbar { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin: -8px 0 20px; font-size: .9rem; }
.app-topbar a { margin-left: 14px; font-weight: 600; }
.auth-card h1 { margin-top: 0; color: var(--blue); }
.terms-row label { display: flex; gap: 10px; align-items: flex-start; font-weight: 600; }
.qr-fairness { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border); }
.qr-fairness img { display: block; margin: 12px 0; border-radius: 12px; background: var(--white); }
.qr-overlay, .integrity-overlay {
    position: absolute; z-index: 5; background: var(--white); color: var(--blue); border-radius: 12px; padding: 10px; box-shadow: var(--shadow);
}
.qr-overlay { right: 16px; top: 58px; text-align: center; font-size: .75rem; font-weight: 700; }
.qr-overlay img { display: block; margin-top: 6px; }
.integrity-overlay { left: 16px; top: 58px; max-width: 280px; font-size: .85rem; white-space: pre-line; }
.proctor-cam {
    position: absolute; width: 160px; height: 120px; left: -9999px; opacity: 0; pointer-events: none;
}
.lock-body, .lock-screen { min-height: 100vh; background: var(--blue); }
.lock-screen { display: grid; place-items: center; padding: 20px; }
.lock-card { max-width: 420px; width: 100%; }
.lock-state { font-size: 1.4rem; font-weight: 800; color: var(--blue); letter-spacing: .08em; }

@media (max-width: 992px) {
    .hero, .feature-grid, .cards-4, .waiting-layout, .form-grid, .app-shell, .steps, .footer-grid, .meet-grid { grid-template-columns: 1fr; }
    .sidebar { position: relative; height: auto; }
    .sidebar nav { height: auto; }
    .hero { padding-top: 36px; }
    .nav-links { flex-wrap: wrap; justify-content: flex-end; }
}