:root {
  --bg: #f6f1e8;
  --card: #fffaf2;
  --text: #2e261f;
  --muted: #6f6256;
  --accent: #c65f3c;
  --accent-dark: #a8492c;
  --line: rgba(46, 38, 31, 0.1);
  --shadow: 0 18px 45px rgba(72, 46, 28, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(198, 95, 60, 0.16), transparent 28%),
    radial-gradient(circle at top right, rgba(224, 186, 118, 0.2), transparent 25%),
    var(--bg);
}

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

.hero {
  padding: 24px;
}

.topbar,
.hero-content,
.section,
.footer {
  max-width: 1100px;
  margin: 0 auto;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 8px 0 24px;
}

.logo {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.nav-link {
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--line);
}

.hero-content {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 24px;
  align-items: center;
  padding: 28px 0 44px;
}

.hero-text h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4.6rem);
  line-height: 1.08;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-dark);
  font-weight: 700;
}

.lead {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.9;
  max-width: 56ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 132px;
  padding: 14px 20px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 10px 24px rgba(198, 95, 60, 0.28);
}

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

.secondary {
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid var(--line);
}

.hero-card,
.feature-card,
.timeline-item,
.info-card,
.level-panel,
.cta-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 28px;
}

.hero-card h2 {
  margin-top: 0;
}

.hero-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 2;
}

.section {
  padding: 28px 24px 12px;
}

.section.alt {
  padding-top: 46px;
}

.section-title p {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-weight: 700;
}

.section-title h2 {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

.feature-grid,
.info-grid,
.teacher-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.teacher-photo {
  margin-top: 22px;
  display: flex;
  justify-content: center;
}

.teacher-photo img {
  width: min(100%, 260px);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center;
  border-radius: 28px;
  border: 6px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.signup-form {
  margin-top: 22px;
  padding: 28px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

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

.field span {
  font-weight: 700;
}

.field input,
.field select {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.75);
  color: var(--text);
  font: inherit;
  outline: none;
}

.field input:focus,
.field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(198, 95, 60, 0.14);
}

.form-note {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 18px;
}

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

.feature-card h3,
.info-card h3,
.timeline-item h3,
.level-panel h3 {
  margin-top: 0;
}

.feature-card p,
.info-card p,
.teacher-card p,
.timeline-item p,
.level-panel p,
.cta-box p {
  color: var(--muted);
  line-height: 1.8;
}

.teacher-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.9;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.timeline-item {
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.step {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(198, 95, 60, 0.12);
  color: var(--accent-dark);
  font-weight: 700;
  font-size: 0.92rem;
}

.level-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 16px;
}

.level-button {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  color: var(--text);
  padding: 12px 18px;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

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

.level-button.active {
  background: var(--accent);
  color: white;
}

.level-panel {
  padding: 28px;
}

.cta-box {
  margin-top: 22px;
  padding: 28px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.contact-qr {
  width: 100%;
  display: grid;
  justify-items: center;
  gap: 10px;
  padding-top: 10px;
}

.contact-qr img {
  width: min(100%, 220px);
  border-radius: 18px;
  border: 6px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
  background: white;
}

.contact-qr p {
  margin: 0;
  color: var(--muted);
  text-align: center;
}

.footer {
  padding: 34px 24px 48px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

@media (max-width: 900px) {
  .hero-content,
  .feature-grid,
  .timeline,
  .info-grid,
  .teacher-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .teacher-photo img {
    width: min(100%, 220px);
  }

  .topbar,
  .footer,
  .cta-box,
  .form-note {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-qr {
    justify-items: flex-start;
  }

  .contact-qr img {
    width: min(100%, 200px);
  }
}

@media (max-width: 600px) {
  .hero,
  .section {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-content {
    padding-top: 10px;
  }

  .button,
  .level-button {
    width: 100%;
  }
}