:root {
  --navy: #0b1730;
  --navy-2: #132546;
  --teal: #14b8a6;
  --teal-dark: #0d8f83;
  --orange: #f97316;
  --orange-soft: #fff0e7;
  --bg: #f4f7f8;
  --card: #ffffff;
  --ink: #0d1b2e;
  --muted: #64748b;
  --line: #dbe4ea;
  --success: #138a5b;
  --danger: #c73838;
  --shadow: 0 14px 38px rgba(11, 23, 48, .08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body { margin: 0; color: var(--ink); background: var(--bg); min-height: 100vh; }
button, input, select, textarea { font: inherit; }
button, select { cursor: pointer; }
a { color: inherit; }

.auth-shell {
  min-height: 100vh; padding: 76px 20px 48px; display: grid; place-items: center;
  background:
    radial-gradient(circle at 18% 18%, rgba(20,184,166,.15), transparent 28%),
    radial-gradient(circle at 83% 78%, rgba(249,115,22,.12), transparent 25%),
    linear-gradient(145deg, #f7fbfb 0%, #eef3f6 100%);
}
.auth-card {
  width: min(520px, 100%); padding: clamp(26px, 6vw, 46px); border: 1px solid rgba(219,228,234,.95);
  border-radius: 30px; background: rgba(255,255,255,.96); box-shadow: 0 28px 80px rgba(11,23,48,.13);
}
.auth-brand { width: max-content; max-width: 100%; padding: 0 0 32px; }
.auth-copy h1 { margin: 6px 0 12px; color: var(--navy); font-size: clamp(30px, 6vw, 43px); line-height: 1.08; letter-spacing: -.04em; }
.auth-copy p { margin: 0 0 26px; color: var(--muted); line-height: 1.65; }
.login-form { display: grid; gap: 14px; }
.login-button, .demo-button { width: 100%; min-height: 50px; }
.form-message { margin: 0; padding: 12px 14px; border-radius: 12px; background: #e8f8f5; color: var(--teal-dark); font-size: 14px; line-height: 1.5; }
.form-message.error { background: #fff0f0; color: var(--danger); }
.auth-divider { display: flex; align-items: center; gap: 12px; margin: 24px 0 16px; color: var(--muted); font-size: 11px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.auth-divider::before, .auth-divider::after { content: ""; height: 1px; flex: 1; background: var(--line); }
.privacy-hint { margin: 18px 0 0; color: var(--muted); font-size: 12px; text-align: center; line-height: 1.5; }
.legal-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 12px; color: var(--muted); font-size: 12px; }
.legal-links button, .sidebar-legal button { border: 0; padding: 0; background: transparent; color: var(--teal-dark); text-decoration: underline; }
.legal-links a { color: var(--teal-dark); }

.prototype-bar {
  position: fixed; inset: 0 0 auto 0; height: 30px; z-index: 30;
  display: grid; place-items: center; background: var(--orange); color: #fff;
  font-size: 12px; font-weight: 800; letter-spacing: .08em;
}
.app-shell { display: grid; grid-template-columns: 270px minmax(0, 1fr); min-height: 100vh; padding-top: 30px; }
.sidebar {
  position: sticky; top: 30px; height: calc(100vh - 30px); padding: 28px 20px;
  background: #fff; border-right: 1px solid var(--line); display: flex; flex-direction: column; overflow-y: auto;
}
.brand { text-decoration: none; display: block; padding: 0 8px 24px; }
.wordmark { display: block; font-weight: 500; font-size: 43px; letter-spacing: -.055em; line-height: 1; color: var(--navy); }
.brand small { display: block; margin-top: 9px; font-size: 9px; font-weight: 800; letter-spacing: .13em; color: var(--navy); }
.v-mark { position: relative; display: inline-block; width: 35px; height: 40px; margin: 0 -2px; vertical-align: -3px; }
.v-mark i, .v-mark b { position: absolute; top: 0; width: 9px; height: 43px; border-radius: 2px; }
.v-mark i { left: 9px; background: var(--teal); transform: rotate(-25deg); transform-origin: top; }
.v-mark b { right: 9px; background: var(--orange); transform: rotate(25deg); transform-origin: top; }
.role-card { margin: 0 0 22px; padding: 15px; border-radius: 16px; background: var(--bg); }
.eyebrow { display: block; margin-bottom: 6px; color: var(--muted); font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.role-card select { width: 100%; border: 1px solid var(--line); border-radius: 11px; padding: 10px; background: #fff; color: var(--ink); font-weight: 700; }
nav { display: grid; gap: 7px; }
.nav-item { border: 0; background: transparent; border-radius: 12px; padding: 12px 14px; text-align: left; color: var(--muted); font-weight: 750; display: flex; align-items: center; gap: 11px; }
.nav-item:hover, .nav-item.active { background: #e9f8f6; color: var(--teal-dark); }
.nav-icon { width: 22px; text-align: center; font-size: 17px; }
.install-button { margin-top: auto; border: 0; border-radius: 12px; padding: 12px; background: var(--teal); color: #fff; font-weight: 800; }
.logout-button { margin-top: 12px; border: 1px solid var(--line); border-radius: 12px; padding: 11px; background: #fff; color: var(--navy); font-weight: 800; }
.account-badge { width: 100%; border: 1px solid var(--line); border-radius: 11px; padding: 10px; background: #fff; color: var(--ink); font-weight: 750; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.contact-mini { margin-top: 18px; padding: 15px 10px 0; border-top: 1px solid var(--line); display: grid; gap: 3px; color: var(--muted); font-size: 12px; }
.contact-mini strong { color: var(--navy); }
.contact-mini a { color: var(--teal-dark); font-weight: 800; text-decoration: none; margin-top: 4px; }
.sidebar-legal { display: flex; gap: 10px; margin-top: 9px; }

.main { min-width: 0; }
.topbar { display: flex; align-items: center; gap: 18px; justify-content: space-between; padding: 38px 44px 22px; }
.topbar > div { flex: 1; }
.topbar h1 { margin: 0; font-size: clamp(25px, 3vw, 38px); color: var(--navy); letter-spacing: -.03em; }
.avatar { width: 48px; height: 48px; border: 0; border-radius: 50%; background: var(--navy); color: #fff; font-weight: 800; }
.menu-button { display: none; border: 0; background: transparent; font-size: 24px; }
.content { padding: 0 44px 56px; max-width: 1480px; margin: 0 auto; }

.hero-card { position: relative; overflow: hidden; display: grid; grid-template-columns: 1.35fr .65fr; gap: 24px; border-radius: 28px; padding: 30px; color: #fff; background: var(--navy); box-shadow: var(--shadow); }
.hero-card::after { content: ""; position: absolute; width: 340px; height: 340px; right: -130px; top: -120px; border-radius: 50%; background: var(--teal); opacity: .27; }
.hero-card .eyebrow { color: #a7e9e2; }
.hero-card h2 { margin: 4px 0 8px; font-size: clamp(26px, 3vw, 42px); }
.hero-card p { margin: 0; color: #d9e3ef; }
.hero-date { align-self: center; justify-self: end; min-width: 180px; padding: 20px; border-radius: 18px; background: rgba(255,255,255,.09); backdrop-filter: blur(4px); }
.hero-date strong { display: block; font-size: 20px; }
.hero-date span { color: #d9e3ef; }

.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin: 20px 0; }
.stat { padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: var(--shadow); }
.stat .label { color: var(--muted); font-size: 13px; font-weight: 700; }
.stat strong { display: block; margin-top: 8px; font-size: 26px; color: var(--navy); }
.stat .accent { color: var(--teal-dark); }
.grid-2 { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr); gap: 20px; }
.card { padding: 24px; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: var(--shadow); }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 18px; }
.card h2, .card h3 { margin: 0; color: var(--navy); }
.card h2 { font-size: 22px; }
.card h3 { font-size: 18px; }
.muted { color: var(--muted); }
.button { border: 0; border-radius: 12px; padding: 11px 15px; background: var(--teal); color: #fff; font-weight: 800; }
.button:hover { background: var(--teal-dark); }
.button.secondary { border: 1px solid var(--line); background: #fff; color: var(--navy); }
.button.orange { background: var(--orange); }
.button.danger { background: #fff0f0; color: var(--danger); }
.button.small { padding: 8px 11px; font-size: 13px; }
.button:disabled { opacity: .48; cursor: not-allowed; }

.timeline { display: grid; gap: 12px; }
.lesson { display: grid; grid-template-columns: 92px minmax(0, 1fr) auto; gap: 16px; align-items: center; padding: 15px; border-radius: 16px; background: var(--bg); border-left: 5px solid var(--teal); }
.lesson.cancelled { opacity: .65; border-left-color: var(--muted); }
.lesson-time { font-weight: 850; color: var(--navy); }
.lesson strong { display: block; }
.lesson small { display: block; margin-top: 4px; color: var(--muted); }
.tag { display: inline-flex; align-items: center; border-radius: 999px; padding: 6px 10px; background: #e8f8f5; color: var(--teal-dark); font-size: 12px; font-weight: 850; }
.tag.orange { background: var(--orange-soft); color: #bd4f09; }
.tag.navy { background: #edf1f6; color: var(--navy); }

.exam-list { display: grid; gap: 12px; }
.exam { display: grid; grid-template-columns: 62px minmax(0, 1fr) auto; gap: 14px; align-items: center; padding: 14px; border-radius: 16px; border: 1px solid var(--line); }
.date-tile { display: grid; place-items: center; width: 58px; height: 58px; border-radius: 14px; color: #fff; background: var(--orange); }
.date-tile strong { font-size: 21px; line-height: 1; }
.date-tile small { font-size: 11px; font-weight: 800; }
.exam h3 { margin-bottom: 4px; }
.exam-actions { display: flex; gap: 7px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 14px 12px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; }
td strong { color: var(--navy); }
.empty { padding: 35px 15px; text-align: center; color: var(--muted); }
.empty-state { padding: clamp(30px, 6vw, 64px) 22px; text-align: center; }
.empty-state .empty-icon { width: 68px; height: 68px; margin: 0 auto 18px; display: grid; place-items: center; border-radius: 22px; background: #e8f8f5; color: var(--teal-dark); font-size: 30px; }
.empty-state h2 { margin: 0 0 10px; color: var(--navy); }
.empty-state p { max-width: 560px; margin: 0 auto; color: var(--muted); line-height: 1.6; }
.loading-panel { min-height: 300px; display: grid; place-items: center; color: var(--muted); font-weight: 750; }
.loading-panel::before { content: ""; width: 28px; height: 28px; margin-right: 12px; border: 3px solid var(--line); border-top-color: var(--teal); border-radius: 50%; animation: spin .75s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.student-switcher { display: flex; gap: 9px; margin-bottom: 20px; overflow-x: auto; }
.student-chip { border: 1px solid var(--line); border-radius: 999px; padding: 9px 13px; background: #fff; color: var(--muted); font-weight: 800; white-space: nowrap; }
.student-chip.active { color: #fff; background: var(--navy); border-color: var(--navy); }
.progress-bar { height: 10px; background: #e6edf1; border-radius: 99px; overflow: hidden; }
.progress-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--teal), var(--orange)); border-radius: inherit; }
.note { border-left: 4px solid var(--orange); padding: 13px 15px; border-radius: 0 12px 12px 0; background: var(--orange-soft); }
.reminder-intro { margin: -4px 0 18px; line-height: 1.55; }
.reminder-list { display: grid; gap: 12px; }
.reminder-card { display: grid; grid-template-columns: 46px minmax(0, 1fr); gap: 14px; align-items: start; padding: 16px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.reminder-card.teal { border-left: 5px solid var(--teal); }
.reminder-card.orange { border-left: 5px solid var(--orange); }
.reminder-icon { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 13px; background: var(--bg); color: var(--navy); font-size: 20px; font-weight: 850; }
.reminder-card h3 { margin: 0 0 5px; }
.reminder-card p { margin: 0 0 5px; color: var(--muted); }
.reminder-card small { color: var(--navy); font-weight: 750; }
.legal-copy { color: var(--ink); line-height: 1.65; }
.legal-copy p { margin: 0 0 16px; }
.legal-copy a { color: var(--teal-dark); }
.legal-copy.compact { padding: 14px 16px; border-radius: 14px; background: var(--bg); }

.modal-backdrop { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 20px; background: rgba(11,23,48,.62); }
.modal { position: relative; width: min(560px, 100%); max-height: 90vh; overflow: auto; border-radius: 24px; padding: 28px; background: #fff; box-shadow: 0 30px 80px rgba(0,0,0,.25); }
.modal-close { position: absolute; right: 18px; top: 14px; border: 0; background: transparent; font-size: 28px; color: var(--muted); }
.modal h2 { margin: 0 42px 20px 0; color: var(--navy); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.field { display: grid; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 13px; font-weight: 800; color: var(--navy); }
.field input, .field select, .field textarea { width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 12px; background: #fff; color: var(--ink); }
.field textarea { min-height: 90px; resize: vertical; }
.form-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }
.toast { position: fixed; z-index: 70; right: 24px; bottom: 24px; max-width: 360px; padding: 14px 18px; border-radius: 14px; background: var(--navy); color: #fff; box-shadow: var(--shadow); }
.hidden { display: none !important; }

.admin-card { overflow: hidden; }
.admin-heading { align-items: flex-end; }
.admin-hint { margin: -2px 0 18px; padding: 14px 16px; border: 1px solid #bfe8e3; border-radius: 14px; background: #f0fbf9; color: var(--teal-dark); line-height: 1.5; }
.admin-actions { display: flex; gap: 7px; }
.muted-row { opacity: .62; background: #f8fafc; }
.status-pill { display: inline-flex; align-items: center; gap: 6px; border-radius: 999px; padding: 6px 10px; background: #e8f8f5; color: var(--success); font-size: 12px; font-weight: 850; }
.status-pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.status-pill.inactive { background: #f1f4f6; color: var(--muted); }
.modal.wide { width: min(780px, 100%); }
.assignment-section { margin-bottom: 24px; }
.assignment-section h3 { margin: 0 0 12px; color: var(--navy); }
.section-title { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.section-title h3 { margin: 0; }
.checkbox-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 4px; }
.checkbox-card { display: flex; align-items: flex-start; gap: 10px; padding: 13px; border: 1px solid var(--line); border-radius: 13px; background: #fff; cursor: pointer; }
.checkbox-card:has(input:checked) { border-color: var(--teal); background: #f0fbf9; }
.checkbox-card input { margin-top: 3px; accent-color: var(--teal-dark); }
.checkbox-card strong, .checkbox-card small { display: block; }
.checkbox-card small { margin-top: 3px; color: var(--muted); line-height: 1.35; }
.toggle-field { display: flex; grid-template-columns: auto 1fr; align-items: center; justify-content: start; gap: 10px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; }
.toggle-field input { width: auto; accent-color: var(--teal-dark); }
.field-help { margin: 7px 0 0; color: var(--muted); font-size: 12px; line-height: 1.5; }
.access-summary { display: flex; gap: 4px; padding: 14px 16px; border-radius: 13px; background: var(--bg); }
.access-summary strong, .access-summary span { display: block; }
.access-summary span { color: var(--muted); font-size: 13px; }
.danger-zone { display: flex; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 18px; padding: 16px; border: 1px solid #f1c7c7; border-radius: 14px; background: #fff8f8; }
.danger-zone strong, .danger-zone span { display: block; }
.danger-zone strong { color: var(--danger); }
.danger-zone span { margin-top: 4px; color: var(--muted); font-size: 13px; line-height: 1.45; }
.danger-zone .button { white-space: nowrap; }
.admin-quick-actions { display: grid; gap: 10px; }
.quick-action { display: grid; gap: 3px; width: 100%; padding: 15px 16px; border: 1px solid var(--line); border-radius: 14px; background: #fff; color: var(--navy); text-align: left; }
.quick-action:hover { border-color: var(--teal); background: #f0fbf9; }
.quick-action span { color: var(--muted); font-size: 13px; }
.export-filters { display: grid; grid-template-columns: minmax(220px, 1.4fr) 1fr 1fr auto; gap: 12px; align-items: end; margin-bottom: 18px; padding: 16px; border-radius: 16px; background: var(--bg); }
.export-filters .button { min-height: 45px; }
.export-summary { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-bottom: 18px; }
.summary-card { padding: 16px; border: 1px solid var(--line); border-radius: 15px; background: #fff; }
.summary-card span { display: block; color: var(--muted); font-size: 12px; font-weight: 750; }
.summary-card strong { display: block; margin-top: 7px; color: var(--navy); font-size: 24px; }
.button-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 4px 0 8px; }
.export-preview { margin-top: 20px; border-top: 1px solid var(--line); }
.compact-table th, .compact-table td { padding: 12px 10px; }
.month-picker { display: flex; align-items: end; gap: 10px; }
.month-picker label { display: grid; gap: 6px; color: var(--muted); font-size: 12px; font-weight: 800; }
.month-picker input { min-height: 43px; border: 1px solid var(--line); border-radius: 12px; padding: 9px 11px; background: #fff; }

@media (max-width: 1050px) {
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-2 { grid-template-columns: 1fr; }
  .export-filters { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .export-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .prototype-bar { font-size: 10px; text-align: center; padding: 0 8px; }
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: fixed; z-index: 40; top: 30px; left: 0; width: 285px; transform: translateX(-105%); transition: .25s ease; box-shadow: var(--shadow); }
  .sidebar.open { transform: translateX(0); }
  .menu-button { display: inline-block; }
  .topbar { padding: 26px 18px 18px; }
  .content { padding: 0 18px 40px; }
  .hero-card { grid-template-columns: 1fr; padding: 24px; }
  .hero-date { justify-self: stretch; }
  .stats { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat { padding: 16px; }
  .lesson { grid-template-columns: 72px minmax(0, 1fr); }
  .lesson > :last-child { grid-column: 2; justify-self: start; }
  .exam { grid-template-columns: 58px minmax(0, 1fr); }
  .exam-actions { grid-column: 2; }
  .form-grid { grid-template-columns: 1fr; }
  .field.full { grid-column: auto; }
  .admin-heading { align-items: flex-start; flex-direction: column; }
  .admin-heading .button { width: 100%; }
  .checkbox-grid, .export-filters, .export-summary { grid-template-columns: 1fr; }
  .admin-actions { flex-direction: column; }
  .danger-zone { grid-template-columns: 1fr; }
  .danger-zone .button { width: 100%; }
  .month-picker { width: 100%; display: grid; grid-template-columns: 1fr auto; }
  .month-picker label { grid-column: 1; }
  .month-picker .button { grid-column: 2; grid-row: 1 / span 2; align-self: end; width: auto; }
}