/* ============================================
   CSS 變數（Token）
   ============================================ */
:root {
  /* Colors */
  --color-ocean: #5B9BAF;
  --color-ocean-light: rgba(91, 155, 175, 0.12);
  --color-sand: #C9B99A;
  --color-cream: #F8F5F0;
  --color-dark: #3D3530;
  --color-sage: #A8C5B5;
  --color-muted: #8A7E76;
  --color-border: #EDE8E2;
  --color-bg-alt: #FAF8F5;

  /* Typography */
  --font-brand: 'DM Serif Display', serif;
  --font-display: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Noto Sans TC', sans-serif;

  /* Shadows */
  --shadow-soft:     0 2px 8px  rgba(61, 53, 48, 0.06);
  --shadow-medium:   0 4px 16px rgba(61, 53, 48, 0.08);
  --shadow-card:     0 4px 24px rgba(61, 53, 48, 0.10);
  --shadow-strong:   0 8px 32px rgba(61, 53, 48, 0.12);
  --shadow-elevated: 0 16px 48px rgba(61, 53, 48, 0.16);

  /* Radius */
  --radius-sm:   8px;
  --radius-md:   16px;
  --radius-lg:   24px;
  --radius-xl:   32px;
  --radius-pill: 100px;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--color-cream);
  color: var(--color-dark);
  font-family: var(--font-body);
  font-size: 20px;
  font-weight: 300;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

/* ============================================
   Layout
   ============================================ */
main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 64px 100px;
}

.section {
  padding: 80px 0 72px;
  border-bottom: 1px solid var(--color-border);
}
.section:last-child { border-bottom: none; }

/* ============================================
   Typography Utilities
   ============================================ */
.section-label {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ocean);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: clamp(28px, 3.5vw, 40px);
  color: var(--color-dark);
  margin-bottom: 36px;
}

/* ============================================
   Navigation
   ============================================ */
#main-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 60px;
  padding: 0 64px;
  background: rgba(248, 245, 240, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(237, 232, 226, 0.8);
}

.nav-brand {
  font-family: var(--font-brand);
  font-size: 20px;
  color: var(--color-dark);
  flex-shrink: 0;
}

.nav-links {
  margin-left: auto;
  display: flex;
  gap: 2px;
}

.nav-link {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 400;
  color: #9A8E86;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--color-dark);
  background: rgba(61, 53, 48, 0.05);
}

.nav-link.active {
  color: var(--color-ocean);
  background: var(--color-ocean-light);
  font-weight: 500;
}

/* ============================================
   Hero / 品牌宣言
   ============================================ */
.section--hero {
  padding-top: 96px;
  padding-bottom: 80px;
}

.hero-title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 52px;
  line-height: 1.2;
  color: var(--color-dark);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.hero-desc {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 20px;
  color: var(--color-muted);
  line-height: 1.9;
}

/* ============================================
   色彩系統
   ============================================ */
.color-grid {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.color-swatch {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 155px;
}

.swatch-block {
  height: 100px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.swatch--ocean  { background: var(--color-ocean); }
.swatch--sand   { background: var(--color-sand); }
.swatch--cream  { background: var(--color-cream); border: 1px solid var(--color-border); }
.swatch--dark   { background: var(--color-dark); }
.swatch--sage   { background: var(--color-sage); }

.swatch-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.swatch-name {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 17px;
  color: var(--color-dark);
}

.swatch-hex {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--color-ocean);
  letter-spacing: 0.04em;
}

.swatch-role {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ============================================
   字型系統
   ============================================ */
.type-stack {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.type-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}
.type-row:last-child { border-bottom: none; padding-bottom: 0; }

.type-meta {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.type-brand      { font-family: var(--font-brand); font-size: 36px; color: var(--color-dark); }
.type-display    { font-family: var(--font-display); font-size: 28px; font-weight: 600; color: var(--color-dark); }
.type-heading-zh { font-family: var(--font-body); font-size: 36px; font-weight: 700; color: var(--color-dark); line-height: 1.3; }
.type-subheading-zh { font-family: var(--font-body); font-size: 20px; font-weight: 400; color: var(--color-dark); }
.type-body-zh    { font-family: var(--font-body); font-size: 20px; font-weight: 300; color: var(--color-muted); line-height: 1.9; max-width: 480px; }

/* ============================================
   陰影與圓角
   ============================================ */
.shadow-grid {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.shadow-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 28px 24px;
  width: 130px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.shadow--soft     { box-shadow: var(--shadow-soft); }
.shadow--medium   { box-shadow: var(--shadow-medium); }
.shadow--card     { box-shadow: var(--shadow-card); }
.shadow--strong   { box-shadow: var(--shadow-strong); }
.shadow--elevated { box-shadow: var(--shadow-elevated); }

.shadow-label {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 500;
  color: var(--color-dark);
}
.shadow-value {
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--color-ocean);
  letter-spacing: 0.02em;
}

.subsection-title {
  font-family: var(--font-body);
  font-size: 22px;
  font-weight: 500;
  color: var(--color-dark);
  margin-bottom: 20px;
}

.radius-grid {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  align-items: flex-end;
}
.radius-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.radius-block {
  width: 72px;
  height: 72px;
  background: var(--color-ocean-light);
  border: 1.5px solid var(--color-ocean);
}
.radius-label {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--color-dark);
  font-weight: 500;
}
.radius-var {
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--color-ocean);
}

/* ============================================
   按鈕與元件
   ============================================ */
.btn-showcase { margin-bottom: 12px; }

.btn-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.btn {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 400;
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}
.btn:hover { opacity: 0.85; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--outline {
  background: transparent;
  border: 1.5px solid var(--color-ocean);
  color: var(--color-ocean);
}
.btn--primary {
  background: var(--color-ocean);
  color: white;
}
.btn--sand {
  background: var(--color-sand);
  color: white;
}

.btn-labels {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.btn-desc {
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--color-muted);
  width: 120px;
  text-align: center;
}

.card-showcase {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 240px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover {
  box-shadow: var(--shadow-elevated);
  transform: translateY(-3px);
}

.card--glass {
  background: rgba(248, 245, 240, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(237, 232, 226, 0.8);
  box-shadow: var(--shadow-medium);
}

.card-icon {
  font-size: 28px;
  width: 48px;
  height: 48px;
  background: var(--color-ocean-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}
.card-title {
  font-family: var(--font-body);
  font-size: 19px;
  font-weight: 500;
  color: var(--color-dark);
  margin-bottom: 8px;
}
.card-text {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 300;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ============================================
   視覺模式
   ============================================ */
.pattern-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.pattern-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: white;
}

.pattern-demo {
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pattern-demo-text {
  font-family: var(--font-body);
  font-size: 15px;
  color: white;
  letter-spacing: 0.08em;
}

.pattern--wave-bg {
  background-color: var(--color-ocean);
  position: relative;
  overflow: hidden;
}
.pattern--wave-bg::before {
  content: '';
  position: absolute;
  bottom: -10px;
  left: -10%;
  width: 120%;
  height: 60px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 60'%3E%3Cpath d='M0,30 C200,60 400,0 600,30 C800,60 1000,0 1200,30 L1200,60 L0,60 Z' fill='rgba(248,245,240,0.25)'/%3E%3C/svg%3E") no-repeat center/cover;
}
.pattern--wave-bg::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: -10%;
  width: 120%;
  height: 48px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 48'%3E%3Cpath d='M0,24 C300,48 600,0 900,24 C1050,36 1150,12 1200,24 L1200,48 L0,48 Z' fill='rgba(248,245,240,0.15)'/%3E%3C/svg%3E") no-repeat center/cover;
}

.pattern--glass-nav {
  background: linear-gradient(135deg, var(--color-ocean-light), var(--color-cream));
}
.pattern-nav-mock {
  background: rgba(248, 245, 240, 0.88);
  backdrop-filter: blur(12px);
  border-radius: 8px;
  padding: 8px 16px;
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--color-dark);
  box-shadow: var(--shadow-soft);
}

.pattern--card-hover {
  background: var(--color-bg-alt);
}
.pattern-card-mock {
  background: white;
  border-radius: var(--radius-md);
  padding: 16px 24px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-dark);
  box-shadow: var(--shadow-elevated);
  transform: translateY(-4px);
}

.pattern--pill-btn {
  background: var(--color-bg-alt);
}

.pattern-info {
  padding: 16px 20px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.pattern-name {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 500;
  color: var(--color-dark);
}
.pattern-desc {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 300;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ============================================
   品牌素材
   ============================================ */
.assets-placeholder {
  display: flex;
  gap: 40px;
  align-items: center;
  flex-wrap: wrap;
}

.assets-wave-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 40px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  flex-shrink: 0;
}

.wave-logo-svg { width: 160px; height: 64px; }

.wave-logo-text {
  font-family: var(--font-brand);
  font-size: 22px;
  color: var(--color-dark);
}

.assets-info {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.assets-status {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
  color: var(--color-sand);
}

.assets-desc {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 300;
  color: var(--color-muted);
  line-height: 1.7;
}

.assets-desc strong { font-weight: 500; color: var(--color-dark); }
.assets-desc code {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--color-ocean);
  background: var(--color-ocean-light);
  padding: 1px 6px;
  border-radius: 4px;
}

/* ============================================
   CSS 變數 Quick Start
   ============================================ */
.quickstart-desc {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 300;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}
.quickstart-desc code,
.quickstart-font-tip code {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--color-ocean);
  background: var(--color-ocean-light);
  padding: 1px 6px;
  border-radius: 4px;
}

.code-block-wrapper {
  position: relative;
  margin-bottom: 28px;
}

.code-block {
  background: #2A2420;
  color: #E8DDD5;
  border-radius: var(--radius-md);
  padding: 24px 28px;
  font-family: 'Courier New', 'Menlo', monospace;
  font-size: 14px;
  line-height: 1.8;
  overflow-x: auto;
  white-space: pre;
}

.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-ocean);
  background: rgba(91, 155, 175, 0.15);
  border: none;
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  cursor: pointer;
  transition: background 0.15s;
}
.copy-btn:hover { background: rgba(91, 155, 175, 0.25); }
.copy-btn.copied { color: var(--color-sage); }

.quickstart-font-tip {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 300;
  color: var(--color-muted);
  margin-bottom: 12px;
}