:root {
  --bg: #f4f8fc;
  --bg-soft: #eef4fa;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: rgba(255, 255, 255, 0.96);
  --line: rgba(38, 82, 126, 0.10);
  --line-strong: rgba(38, 82, 126, 0.18);
  --text: #17324d;
  --text-soft: #58718a;
  --primary: #2e74b5;
  --primary-deep: #1f5f98;
  --accent: #78a9d4;
  --soft-blue: #e7f0f8;
  --soft-gold: #f5f0e6;
  --danger: #d95c5c;
  --success: #2c8a68;
  --shadow: 0 18px 48px rgba(26, 58, 93, 0.08);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --max-width: 1200px;
  --header-h: 82px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body {
  margin: 0;
  color: var(--text);
  font-family: "Inter", "Noto Sans TC", sans-serif;
  background: linear-gradient(180deg, #f7fbff 0%, #f2f7fb 50%, #eef4f9 100%);
  line-height: 1.68;
  overflow-x: hidden;
}
body.menu-open { overflow: hidden; }
a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; }
.container { width: min(calc(100% - 32px), var(--max-width)); margin: 0 auto; }
.section { padding: 44px 0; }

.bg-orb {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: -3;
  filter: blur(10px);
}
.orb-1 {
  width: 420px;
  height: 420px;
  top: -90px;
  left: -80px;
  background: radial-gradient(circle, rgba(120, 169, 212, 0.22), transparent 70%);
}
.orb-2 {
  width: 460px;
  height: 460px;
  right: -120px;
  top: 160px;
  background: radial-gradient(circle, rgba(194, 214, 234, 0.34), transparent 70%);
}
.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -4;
  background-image:
    linear-gradient(rgba(46, 116, 181, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 116, 181, 0.035) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(circle at center, black 28%, transparent 82%);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(14px);
  background: rgba(247, 251, 255, 0.84);
  border-bottom: 1px solid rgba(38, 82, 126, 0.08);
}
.header-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand { display: inline-flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), #7ea9cf);
  box-shadow: 0 10px 24px rgba(46, 116, 181, 0.15);
  position: relative;
}
.brand-mark::before {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: 12px;
  background: linear-gradient(160deg, rgba(255,255,255,0.55), transparent 45%);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 20px; font-weight: 800; letter-spacing: 0.02em; }
.brand-text small { color: var(--text-soft); font-size: 14px; letter-spacing: 0.12em; text-transform: uppercase; }

.desktop-nav { display: flex; align-items: center; gap: 22px; }
.desktop-nav a {
  color: var(--text-soft);
  font-size: 14px;
  transition: 0.2s ease;
}
.desktop-nav a:hover,
.desktop-nav a.active { color: var(--primary-deep); }
.header-actions { display: flex; align-items: center; gap: 10px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 700;
  transition: 0.22s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  box-shadow: 0 12px 24px rgba(46, 116, 181, 0.16);
}
.btn-secondary {
  color: var(--primary-deep);
  background: rgba(255,255,255,0.76);
  border-color: rgba(46, 116, 181, 0.14);
}

.menu-toggle {
  width: 46px;
  height: 46px;
  display: none;
  border: 1px solid rgba(38, 82, 126, 0.12);
  border-radius: 14px;
  background: rgba(255,255,255,0.9);
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.menu-toggle span {
  width: 18px;
  height: 2px;
  background: var(--primary-deep);
  border-radius: 999px;
  display: block;
}
.mobile-panel {
  display: none;
  padding: 0 16px 16px;
  gap: 10px;
  flex-direction: column;
  background: rgba(247, 251, 255, 0.98);
  border-top: 1px solid rgba(38, 82, 126, 0.08);
}
.mobile-panel a {
  display: block;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(38, 82, 126, 0.08);
  color: var(--text);
}
.mobile-panel.show { display: flex; }

.hero { padding-top: 36px; }
.hero-layout {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 26px;
  align-items: stretch;
}
.hero-copy,
.hero-side { min-width: 0; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  border-radius: 999px;
  background: var(--soft-blue);
  color: var(--primary-deep);
  border: 1px solid rgba(46, 116, 181, 0.10);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 18px;
}
.hero-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(36px, 5vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.04em;
}
.hero-copy h1 span {
  color: var(--primary-deep);
}
.hero-desc {
  margin: 0 0 24px;
  color: var(--text-soft);
  font-size: 16px;
  max-width: 660px;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}
.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.meta-card,
.panel-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}
.meta-card {
  padding: 18px;
}
.meta-label {
  display: block;
  color: var(--text-soft);
  font-size: 12px;
  margin-bottom: 6px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.meta-card strong { font-size: 15px; }

.hero-side {
  display: grid;
  gap: 14px;
}
.overview-card,
.stats-card {
  padding: 22px;
}
.card-kicker {
  color: var(--primary-deep);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.overview-card h3,
.stats-card h3 { margin: 0 0 10px; font-size: 24px; }
.overview-card p,
.stats-card p { margin: 0; color: var(--text-soft); }
.keypoints-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.mini-card {
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255,255,255,0.86);
  border: 1px solid rgba(46, 116, 181, 0.10);
  color: var(--primary-deep);
  font-weight: 700;
  text-align: center;
  box-shadow: 0 10px 24px rgba(26, 58, 93, 0.05);
}
.stats-card {
  display: grid;
  gap: 14px;
}
.stats-item {
  padding-top: 4px;
}
.stats-item span {
  display: block;
  color: var(--text-soft);
  font-size: 13px;
  margin-bottom: 4px;
}
.stats-item strong { font-size: 18px; }

.section-head {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 24px;
  align-items: end;
  margin-bottom: 24px;
}
.section-kicker {
  display: inline-block;
  color: var(--primary-deep);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.section-head h2 {
  margin: 0;
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.03em;
}
.section-head p {
  margin: 0;
  color: var(--text-soft);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.feature-card,
.audience-card,
.note-item,
.contact-card,
.form-card,
.class-card {
  padding: 24px;
}
.feature-icon {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  background: var(--soft-blue);
  color: var(--primary-deep);
  font-size: 14px;
  font-weight: 800;
}
.feature-card h3,
.audience-card h3,
.class-card h3,
.note-item h3,
.contact-card h2,
.form-head h2 {
  margin: 0 0 10px;
}
.feature-card p,
.audience-card p,
.note-item p,
.contact-lead,
.form-head p {
  margin: 0;
  color: var(--text-soft);
}

.schedule-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.class-badge {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--soft-gold);
  color: #8a6a2c;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}
.class-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.class-card li {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(38, 82, 126, 0.08);
}
.class-card li:last-child { border-bottom: 0; }
.class-card li span {
  color: var(--text-soft);
  font-size: 14px;
}
.class-card li strong {
  font-size: 15px;
  line-height: 1.6;
}

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

.notes-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.media-card {
  overflow: hidden;
}
.media-frame {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #edf4fa;
  border-bottom: 1px solid rgba(38, 82, 126, 0.08);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-body {
  padding: 20px 22px 22px;
}
.media-kicker {
  display: inline-block;
  color: var(--primary-deep);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.media-body h3 {
  margin: 0 0 10px;
}
.media-body p {
  margin: 0;
  color: var(--text-soft);
}

.register-layout {
  display: grid;
  grid-template-columns: 0.6fr 1.4fr;
  gap: 22px;
  align-items: start;
}
.contact-lead { margin-bottom: 20px; }
.contact-list {
  display: grid;
  gap: 12px;
  margin-bottom: 20px;
}
.contact-item {
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(245, 249, 253, 0.95);
  border: 1px solid rgba(38, 82, 126, 0.08);
}
.contact-item span {
  display: block;
  color: var(--text-soft);
  font-size: 12px;
  margin-bottom: 4px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.contact-item strong { font-size: 16px; }
.inline-link {
  color: var(--primary-deep);
  font-weight: 700;
}
.form-head { margin-bottom: 20px; }
form { display: grid; gap: 18px; }
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.field label {
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}
.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid rgba(38, 82, 126, 0.12);
  background: rgba(255,255,255,0.96);
  color: var(--text);
  border-radius: 14px;
  min-height: 52px;
  padding: 0 16px;
  outline: none;
  transition: 0.2s ease;
}
.field textarea {
  padding: 14px 16px;
  min-height: 120px;
  resize: vertical;
}
.field select { appearance: none; }
.field input::placeholder,
.field textarea::placeholder { color: #8aa0b5; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: rgba(46, 116, 181, 0.42);
  box-shadow: 0 0 0 4px rgba(46, 116, 181, 0.10);
}

.choice-grid { display: grid; gap: 14px; }
.choice-grid.two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.choice-card { position: relative; }
.choice-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.choice-card label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 100%;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(38, 82, 126, 0.10);
  cursor: pointer;
  transition: 0.22s ease;
}
.choice-card label strong { font-size: 16px; }
.choice-card label span {
  color: var(--text-soft);
  font-size: 13px;
}
.choice-card input:checked + label {
  border-color: rgba(46, 116, 181, 0.28);
  background: #f4f9fe;
  box-shadow: 0 12px 26px rgba(46, 116, 181, 0.08);
}

.agree-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  border-radius: 16px;
  background: #f7fafc;
  border: 1px solid rgba(39, 91, 139, 0.08);
}

.agree-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.agree-head input {
  margin-top: 4px;
  accent-color: var(--primary);
  transform: scale(1.1);
  flex-shrink: 0;
}

.agree-label {
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.7;
  cursor: pointer;
}

.agree-toggle {
  align-self: flex-start;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(39, 91, 139, 0.12);
  background: #ffffff;
  color: var(--primary-deep);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: 0.2s ease;
}

.agree-toggle:hover {
  background: var(--soft-blue);
  transform: translateY(-1px);
}

.agree-toggle::after {
  content: "＋";
  margin-left: 8px;
  font-weight: 800;
}

.agree-toggle.is-open::after {
  content: "－";
}

.agree-content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  padding: 0 2px;
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.8;
  background: rgba(255, 255, 255, 0.72);
  border-radius: 14px;
  transition:
    max-height 0.35s ease,
    opacity 0.25s ease,
    padding 0.25s ease;
}

.agree-content.open {
  max-height: 1200px;
  opacity: 1;
  padding: 14px 16px;
  border: 1px solid rgba(39, 91, 139, 0.08);
}

.agree-content ol {
  margin: 12px 0 0;
  padding-left: 20px;
}

.agree-content li + li {
  margin-top: 10px;
}

.form-actions {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
}
.form-actions p {
  margin: 0;
  color: var(--text-soft);
  font-size: 13px;
}

.field.error input,
.field.error select,
.field.error textarea {
  border-color: rgba(217, 92, 92, 0.42);
  box-shadow: 0 0 0 4px rgba(217, 92, 92, 0.08);
}
.error-text {
  display: none;
  color: var(--danger);
  font-size: 13px;
}
.field.error .error-text { display: block; }

.toast {
  position: fixed;
  right: 20px;
  bottom: 92px;
  z-index: 1200;
  max-width: 420px;
  min-width: 280px;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.98);
  color: var(--text);
  border: 1px solid rgba(38, 82, 126, 0.12);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(22px);
  pointer-events: none;
  transition: 0.26s ease;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.success { border-color: rgba(44, 138, 104, 0.26); }
.toast.error { border-color: rgba(217, 92, 92, 0.26); }

.mobile-floating-cta {
  display: none;
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 1100;
  padding-bottom: env(safe-area-inset-bottom);
}
.mobile-floating-cta .btn {
  width: 100%;
  min-height: 54px;
  border-radius: 18px;
}

.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.68s ease, transform 0.68s ease;
}
.reveal.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1100px) {
  .hero-layout,
  .register-layout,
  .section-head,
  .schedule-grid,
  .media-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .audience-grid { grid-template-columns: 1fr; }
  .notes-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section-head { gap: 10px; }
}

@media (max-width: 820px) {
  .desktop-nav,
  .desktop-only { display: none; }
  .menu-toggle { display: inline-flex; }
  .hero-copy h1 { font-size: 38px; }
  .hero-meta,
  .form-grid,
  .choice-grid.two-col,
  .keypoints-grid,
  .feature-grid,
  .notes-grid { grid-template-columns: 1fr; }
  .contact-card,
  .form-card,
  .feature-card,
  .audience-card,
  .class-card,
  .note-item,
  .overview-card,
  .stats-card { padding: 22px; }
  .mobile-floating-cta { display: block; }
  .toast {
    right: 12px;
    left: 12px;
    bottom: 84px;
    max-width: none;
    min-width: 0;
  }
  body { padding-bottom: 76px; }
}

@media (max-width: 560px) {
  .container { width: min(calc(100% - 24px), var(--max-width)); }
  .header-inner { min-height: 74px; }
  /*.brand-text strong { font-size: 14px; }*/
  .hero { padding-top: 24px; }
  .section { padding: 34px 0; }
  .hero-badge { font-size: 12px; }
  .hero-copy h1 { font-size: 32px; }
  .hero-desc { font-size: 15px; }
  .section-head h2 { font-size: 30px; }
  .class-card li { grid-template-columns: 1fr; gap: 6px; }
}