:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --surface-2: #222222;
  --text: #ffffff;
  --muted: #bbbbbb;
  --primary: #ffffff;
  --primary-dark: #e6e6e6;
  --accent: #2a2a2a;
  --border: #2f2f2f;
  --success: #3ddc97;
  --danger: #ff5c5c;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  --radius: 20px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, #0a0a0a 0%, #121212 45%, #0a0a0a 100%);
  color: var(--text);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea, select { font: inherit; }

.container {
  width: 100%;
  padding: 0 32px;
  margin: 0;
}

.image-break {
  width: 100%;
  height: 400px;
  overflow: hidden;
}

.image-break img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.7;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(15, 15, 15, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  gap: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: linear-gradient(135deg, #000000, #333333);
  color: white;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow);
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  font-weight: 600;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary-dark);
}

.btn {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, opacity 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--primary);
  color: #111111;
}

.btn-primary:hover { background: var(--primary-dark); }

.btn-secondary {
  background: #1a1a1a;
  color: #ffffff;
  border: 1px solid var(--border);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.hero {
  padding: 68px 0 34px;
}

.page-hero {
  padding-bottom: 10px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: stretch;
}

.hero-card,
.panel,
.teacher-card,
.info-card,
.dashboard-card,
.form-card {
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
}

.section-soft {
  padding: 60px 0;
}

.section-divider {
  border-top: 1px solid rgba(255,255,255,0.06);
}

.hero-card {
  padding: 34px;
  background:
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.05), transparent 28%),
    linear-gradient(180deg, #1a1a1a 0%, #111111 100%);
}

.narrow-card {
  max-width: 900px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: #1a1a1a;
  border: 1px solid var(--border);
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 700;
}

h1, h2, h3, h4 {
  margin: 0 0 14px;
  line-height: 1.1;
}

h1 {
  font-size: clamp(2.25rem, 4vw, 4.2rem);
  letter-spacing: -0.04em;
}

h2 {
  font-size: clamp(1.7rem, 2.6vw, 2.6rem);
  letter-spacing: -0.03em;
}

p {
  color: var(--muted);
  line-height: 1.7;
  margin: 0 0 16px;
}

.lead {
  font-size: 1.08rem;
  max-width: 65ch;
}

.hero-actions,
.row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.hero-actions { margin-top: 22px; }

.hero-side {
  padding: 28px;
  display: grid;
  gap: 16px;
}

.stat {
  padding: 18px;
  border-radius: 18px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.stat strong {
  display: block;
  font-size: 1.9rem;
  color: var(--primary-dark);
  margin-bottom: 6px;
}

section { padding: 32px 0; }

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.info-card,
.teacher-card,
.form-card,
.dashboard-card { padding: 24px; }

.teacher-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.teacher-card .teacher-tag,
.pill {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 8px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--primary-dark);
  border: 1px solid var(--border);
  padding: 7px 12px;
  font-size: 0.9rem;
  font-weight: 700;
}

.teacher-card .card-actions {
  margin-top: auto;
  padding-top: 6px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.teacher-profile-card {
  padding: 28px;
}

.teacher-hero {
  display: flex;
  align-items: flex-start;
  gap: 32px;
}

.teacher-hero > div:last-child {
  max-width: 800px;
}

.teacher-photo {
  display: inline-block;
  border-radius: 24px;
  overflow: hidden;
  background: none;
  border: none;
}

.teacher-photo img {
  width: auto;
  height: auto;
  max-width: 100%;
  border-radius: 24px;
  display: block;
}

.teacher-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 8px 0 16px;
}

.teacher-detail-box {
  margin-top: 16px;
  padding: 18px;
  border-radius: 18px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.enrolment-wrap {
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  gap: 22px;
  align-items: start;
}

.status-banner {
  padding: 14px 16px;
  border-radius: 16px;
  font-weight: 700;
  margin-bottom: 16px;
}

.status-open {
  background: rgba(61, 220, 151, 0.1);
  color: var(--success);
  border: 1px solid rgba(61, 220, 151, 0.22);
}

.status-closed {
  background: rgba(255, 92, 92, 0.08);
  color: var(--danger);
  border: 1px solid rgba(255, 92, 92, 0.18);
}

.embed-shell {
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: #111;
  min-height: 720px;
}

iframe {
  width: 100%;
  min-height: 720px;
  border: 0;
  display: block;
  background: #fff;
}

.notice {
  padding: 14px 16px;
  border-radius: 16px;
  background: #1a1a1a;
  border: 1px solid var(--border);
  color: #dddddd;
  font-weight: 600;
  margin-bottom: 16px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

label {
  display: block;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.field,
textarea,
select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #111111;
  color: var(--text);
  outline: none;
}

textarea {
  resize: vertical;
  min-height: 120px;
}

.small {
  font-size: 0.92rem;
  color: var(--muted);
}

.space-top { margin-top: 14px; }

.admin-shell {
  display: block;
  padding-bottom: 56px;
}

.static-admin-page {
  min-height: calc(100vh - 100px);
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 18px;
  align-items: start;
}

.dashboard-card h3,
.dashboard-card h4 { margin-bottom: 10px; }

.list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.list-item {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #1a1a1a;
}

.list-item strong {
  display: block;
  margin-bottom: 4px;
}

.hidden { display: none !important; }

.footer {
  padding: 30px 0 50px;
  color: var(--muted);
}

.footer-card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #1a1a1a 0%, #111111 100%);
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.empty-state {
  padding: 22px;
  border-radius: 18px;
  border: 1px dashed var(--border);
  background: #151515;
  color: var(--muted);
  text-align: center;
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
}

@media (max-width: 980px) {
  .hero-grid,
  .grid-3,
  .grid-2,
  .teacher-hero,
  .enrolment-wrap,
  .dashboard-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    padding: 14px 0;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
  }

  .hero-card,
  .hero-side {
    padding: 24px;
  }
}

@media (max-width: 640px) {
  .form-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 12px; }
  .hero { padding-top: 44px; }
}