:root {
  --bg: #0f172a;
  --bg-soft: #111827;
  --card: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.14);
  --text: #f8fafc;
  --muted: #cbd5e1;
  --accent: #38bdf8;
  --accent-2: #22c55e;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.2), transparent 28%),
    radial-gradient(circle at right center, rgba(34, 197, 94, 0.16), transparent 24%),
    linear-gradient(180deg, #0f172a 0%, #111827 100%);
  color: var(--text);
}

a {
  color: inherit;
  text-decoration: none;
}

.hero,
.section,
.footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: center;
  padding: 48px 0;
}

.badge {
  display: inline-block;
  margin: 0 0 16px;
  padding: 8px 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  color: var(--accent);
  background: rgba(56, 189, 248, 0.08);
}

.hero h1,
.section h2,
.cta h2 {
  margin: 0;
  line-height: 1.1;
}

.hero h1 {
  font-size: clamp(3rem, 7vw, 5.8rem);
}

.hero__text,
.card p,
.step p,
.footer p {
  color: var(--muted);
  line-height: 1.8;
}

.hero__text {
  max-width: 640px;
  font-size: 1.05rem;
  margin: 20px 0 32px;
}

.hero__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 132px;
  padding: 14px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #052e16;
  font-weight: 700;
}

.btn--ghost {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.04);
}

.hero__panel {
  display: grid;
  gap: 16px;
}

.stat,
.card,
.step,
.cta {
  background: var(--card);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(18px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.stat {
  padding: 28px;
  border-radius: 24px;
}

.stat span {
  display: block;
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
}

.stat p {
  margin: 8px 0 0;
  color: var(--text);
}

.section {
  padding: 56px 0;
}

.section__title p,
.cta p {
  margin: 0 0 10px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.section__title h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 28px;
}

.teacher {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  align-items: center;
  margin-top: 28px;
  padding: 28px;
  border-radius: 28px;
  background: var(--card);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(18px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.teacher__photo {
  width: 100%;
  height: 100%;
  max-height: 320px;
  object-fit: cover;
  border-radius: 24px;
  display: block;
}

.teacher__content h3 {
  margin: 0 0 12px;
  font-size: 1.6rem;
}

.teacher__content ul {
  margin: 18px 0 0;
  padding-left: 18px;
  color: var(--text);
  line-height: 1.8;
}

.card {
  padding: 24px;
  border-radius: 24px;
}

.card__icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  font-weight: 800;
}

.card h3,
.step h3 {
  margin: 18px 0 10px;
  font-size: 1.35rem;
}

.card ul {
  margin: 18px 0 0;
  padding-left: 18px;
  color: var(--text);
  line-height: 1.8;
}

.section--soft {
  padding-top: 12px;
}

.timeline {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 20px;
  align-items: start;
  padding: 22px 24px;
  border-radius: 24px;
}

.step span {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border-radius: 20px;
  background: rgba(34, 197, 94, 0.16);
  color: #86efac;
  font-size: 1.4rem;
  font-weight: 800;
}

.cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px;
  border-radius: 28px;
}

.booking-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
  padding: 28px;
  border-radius: 28px;
  background: var(--card);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(18px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.field {
  display: grid;
  gap: 10px;
}

.field--full {
  grid-column: 1 / -1;
}

.field label {
  font-weight: 700;
  color: var(--text);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(15, 23, 42, 0.6);
  color: var(--text);
  font: inherit;
  outline: none;
}

.field input::placeholder,
.field textarea::placeholder {
  color: rgba(203, 213, 225, 0.7);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: rgba(56, 189, 248, 0.8);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.12);
}

.field textarea {
  resize: vertical;
  min-height: 140px;
}

.footer {
  padding: 28px 0 40px;
  text-align: center;
}

.footer p {
  margin: 4px 0;
}

@media (max-width: 900px) {
  .hero,
  .grid,
  .cta,
  .booking-form {
    grid-template-columns: 1fr;
  }

  .teacher {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 28px;
  }
}

@media (max-width: 640px) {
  .hero,
  .section,
  .footer {
    width: min(1120px, calc(100% - 24px));
  }

  .hero h1 {
    font-size: clamp(2.5rem, 14vw, 4rem);
  }

  .step {
    grid-template-columns: 1fr;
  }

  .teacher__photo {
    max-height: 240px;
  }
}