/* ==========================================================================
   elinkBook (易閱書) - 官方專屬 SPA 網站樣式表
   風格靈感：東方古籍、竹韻青綠、樓閣暖金、E-Ink 電子紙質
   ========================================================================== */

:root {
  /* 主色系：竹韻青綠與墨綠 */
  --color-primary: #2d5a43;
  --color-primary-light: #417a5d;
  --color-primary-dark: #1b3829;
  --color-primary-soft: rgba(45, 90, 67, 0.08);

  /* 輔助色系：古閣流光暖金與琥珀 */
  --color-gold: #d4a017;
  --color-gold-light: #f5d061;
  --color-gold-dark: #9e750e;
  --color-gold-glow: rgba(245, 208, 97, 0.35);

  /* 背景與紙質基調 */
  --bg-parchment: #fbf9f4;
  --bg-parchment-warm: #f3ede2;
  --bg-card: #ffffff;
  --bg-card-alt: #f8f6f0;
  --border-color: #e5dec9;
  --border-color-light: #efebe0;

  /* 文字與墨色 */
  --text-main: #232724;
  --text-secondary: #57605a;
  --text-muted: #858f88;
  --text-gold: #9e750e;

  /* E-Ink 特殊模式變數 */
  --eink-border: #111111;
  --eink-bg: #ffffff;
  --eink-text: #000000;

  /* 字體族群 */
  --font-serif: "Noto Serif TC", "Songti TC", "Source Han Serif TC", "PMingLiU", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-kai: "Kaiti TC", "STKaiti", "DFKai-SB", "BiauKai", "Noto Serif TC", serif;

  /* 圓角與陰影 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(35, 39, 36, 0.05);
  --shadow-md: 0 8px 24px rgba(45, 90, 67, 0.08);
  --shadow-lg: 0 16px 36px rgba(45, 90, 67, 0.12);
  --shadow-glow: 0 0 30px rgba(245, 208, 97, 0.25);
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 深色模式 / 墨夜模式 */
[data-theme="dark"] {
  --color-primary: #529672;
  --color-primary-light: #73b894;
  --color-primary-dark: #1b3829;
  --color-primary-soft: rgba(82, 150, 114, 0.15);

  --color-gold: #f5d061;
  --color-gold-light: #ffe89e;
  --color-gold-dark: #d4a017;
  --color-gold-glow: rgba(245, 208, 97, 0.2);

  --bg-parchment: #131715;
  --bg-parchment-warm: #1a201c;
  --bg-card: #1c221e;
  --bg-card-alt: #232b26;
  --border-color: #2e3b33;
  --border-color-light: #243029;

  --text-main: #e8eee9;
  --text-secondary: #a3b2a7;
  --text-muted: #6f7f74;
  --text-gold: #f5d061;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.6);
}

/* ==========================================================================
   全域基礎重設與排版
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-parchment);
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  background-image: 
    radial-gradient(var(--border-color-light) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(251, 249, 244, 0.8), rgba(243, 237, 226, 0.9));
  background-size: 28px 28px, 100% 100%;
  background-attachment: fixed;
}

[data-theme="dark"] body {
  background-image: 
    radial-gradient(var(--border-color-light) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(19, 23, 21, 0.95), rgba(26, 32, 28, 0.95));
}

h1, h2, h3, h4, .brand-font, .serif-heading {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-gold);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-narrow {
  max-width: 880px;
}

/* ==========================================================================
   頂部導覽列 (Navbar)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 249, 244, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

[data-theme="dark"] .site-header {
  background: rgba(19, 23, 21, 0.92);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(45, 90, 67, 0.18);
  border: 2px solid var(--color-gold-light);
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.brand-logo:hover .brand-icon {
  transform: rotate(-3deg) scale(1.05);
}

.brand-titles {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--color-primary-dark);
  display: flex;
  align-items: center;
  gap: 6px;
}

[data-theme="dark"] .brand-name {
  color: var(--text-main);
}

.brand-badge {
  font-size: 0.72rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  color: #fff;
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.brand-tagline {
  font-size: 0.76rem;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.8rem;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 2px;
  transition: color var(--transition-fast);
  cursor: pointer;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2.5px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-theme-toggle {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-theme-toggle:hover {
  color: var(--color-gold);
  border-color: var(--color-gold);
  transform: rotate(15deg);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 9px 20px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(45, 90, 67, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.15);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(45, 90, 67, 0.35);
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
}

.btn-gold {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  box-shadow: 0 4px 14px var(--color-gold-glow);
}

.btn-gold:hover {
  background: linear-gradient(135deg, var(--color-gold-light), var(--color-gold));
  box-shadow: 0 6px 20px var(--color-gold-glow);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 9px 18px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.84rem;
}

.nav-toggle-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   Hero 英雄主視覺區塊
   ========================================================================== */
.hero-section {
  padding: 4rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.hero-badge-wrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  width: fit-content;
  box-shadow: var(--shadow-sm);
}

.hero-badge-icon {
  color: var(--color-gold);
  font-size: 0.95rem;
}

.hero-badge-text {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: 2.85rem;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.hero-title .highlight-oriental {
  background: linear-gradient(135deg, var(--color-primary), var(--color-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.12rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.highlight-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.highlight-num {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.highlight-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Hero 右側：互動式電子墨水 / 直排閱讀展示模擬器
   ========================================================================== */
.reader-mockup-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
}

.reader-mockup-header {
  padding: 12px 18px;
  background: var(--bg-card-alt);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mockup-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-color);
}
.mockup-dot.dot-active {
  background: var(--color-gold);
}

.mockup-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
}

.demo-chip-btn {
  font-size: 0.76rem;
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.demo-chip-btn.active, .demo-chip-btn:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* 模擬書頁畫面 */
.reader-page-view {
  padding: 2rem 1.75rem;
  min-height: 420px;
  max-height: 460px;
  overflow-y: auto;
  position: relative;
  background-color: #faf6ee;
  color: #2b2b2b;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

/* 紙質風格主題 */
.reader-page-view.theme-parchment {
  background-color: #f7f1e5;
  color: #2b261f;
}
.reader-page-view.theme-eink {
  background-color: #ffffff;
  color: #000000;
  filter: contrast(110%);
}
.reader-page-view.theme-dark {
  background-color: #1a1e1b;
  color: #d1dcd4;
}

/* 直排排版核心 (Vertical Writing Mode) */
.reader-page-view.mode-vertical {
  writing-mode: vertical-rl;
  -webkit-writing-mode: vertical-rl;
  text-orientation: mixed;
  line-height: 2.1;
  letter-spacing: 2px;
  font-family: var(--font-kai);
  overflow-x: auto;
  overflow-y: hidden;
  height: 420px;
}

.reader-page-view.mode-horizontal {
  writing-mode: horizontal-tb;
  -webkit-writing-mode: horizontal-tb;
  line-height: 1.9;
  letter-spacing: 0.5px;
  font-family: var(--font-serif);
}

.reader-sample-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-primary-dark);
}
.reader-page-view.theme-dark .reader-sample-title {
  color: var(--color-gold-light);
}

.reader-sample-text {
  font-size: 1.05rem;
}

.reader-sample-text p {
  margin-bottom: 1.2rem;
  text-indent: 2em;
}

.reader-page-view.mode-vertical .reader-sample-text p {
  margin-bottom: 0;
  margin-left: 1.6rem;
}

.reader-mockup-footer {
  padding: 10px 18px;
  background: var(--bg-card-alt);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   區塊標題共用元件
   ========================================================================== */
.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
  position: relative;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-gold-dark);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 0.6rem;
}

[data-theme="dark"] .section-tag {
  color: var(--color-gold-light);
}

.section-title {
  font-size: 2.25rem;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto;
}

/* ==========================================================================
   特色卡片網格 (Features Section)
   ========================================================================== */
.features-section {
  padding: 5rem 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.2rem 1.8rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 1.4rem;
  transition: all var(--transition-fast);
}

.feature-card:hover .feature-icon-box {
  background: var(--color-primary);
  color: #ffffff;
  transform: scale(1.05);
}

.feature-card-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.feature-card-desc {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border-color);
}

.feature-tag-item {
  font-size: 0.75rem;
  padding: 2px 8px;
  background: var(--bg-card-alt);
  color: var(--text-muted);
  border-radius: 4px;
}

/* ==========================================================================
   格式支援與規格 (Formats & Specs Section)
   ========================================================================== */
.specs-section {
  padding: 5rem 0;
  background: var(--bg-card-alt);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.formats-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.format-badge-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.format-badge-card:hover {
  border-color: var(--color-gold);
  transform: translateY(-3px);
}

.format-name {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}
[data-theme="dark"] .format-name {
  color: var(--color-gold-light);
}

.format-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.specs-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.spec-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.spec-box-title {
  font-size: 1.2rem;
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-primary);
}

.spec-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.spec-list li {
  font-size: 0.94rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.spec-list li svg {
  color: var(--color-gold-dark);
  flex-shrink: 0;
  margin-top: 3px;
}

/* ==========================================================================
   SPA 視圖頁籤切換控制 (SPA Views System)
   ========================================================================== */
.spa-view {
  display: none;
  animation: fadeIn 0.35s ease forwards;
}

.spa-view.active-view {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   法律文件專區：隱私權政策與服務條款 (Legal Pages)
   ========================================================================== */
.legal-container {
  padding: 3.5rem 0 5rem;
}

.legal-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid var(--border-color);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.legal-title-wrap h1 {
  font-size: 2.2rem;
  color: var(--color-primary-dark);
  margin-bottom: 0.4rem;
}
[data-theme="dark"] .legal-title-wrap h1 {
  color: var(--color-gold-light);
}

.legal-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.legal-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.legal-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.8rem 3rem;
  box-shadow: var(--shadow-sm);
  line-height: 1.9;
}

.legal-article-card h2 {
  font-size: 1.35rem;
  color: var(--color-primary);
  margin: 2.2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.legal-article-card h2:first-child {
  margin-top: 0;
}

.legal-article-card h3 {
  font-size: 1.12rem;
  color: var(--text-main);
  margin: 1.4rem 0 0.6rem;
}

.legal-article-card p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 1.2rem;
}

.legal-article-card ul, .legal-article-card ol {
  margin: 0.8rem 0 1.4rem 1.8rem;
  color: var(--text-secondary);
}

.legal-article-card li {
  margin-bottom: 0.5rem;
}

.legal-badge-pill {
  display: inline-block;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-right: 6px;
}

.legal-highlight-box {
  background: var(--bg-card-alt);
  border-left: 4px solid var(--color-gold);
  padding: 1.2rem 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.6rem 0;
  font-size: 0.95rem;
}

/* ==========================================================================
   下載 / 取得 App 區塊 (Download Section)
   ========================================================================== */
.download-section {
  padding: 5rem 0;
  position: relative;
}

.download-banner {
  background: linear-gradient(135deg, var(--color-primary-dark), #14281e);
  border-radius: var(--radius-lg);
  padding: 3.5rem 3rem;
  color: #ffffff;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
  border: 1px solid rgba(245, 208, 97, 0.3);
}

.download-banner::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, var(--color-gold-glow), transparent 70%);
  pointer-events: none;
}

.download-title {
  font-size: 2.2rem;
  color: #ffffff;
  margin-bottom: 1rem;
}

.download-desc {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 1.8rem;
  line-height: 1.8;
}

.download-btn-group {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.btn-download-app {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: #ffffff;
  color: var(--color-primary-dark) !important;
  font-weight: 700;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.2);
  transition: all var(--transition-fast);
}

.btn-download-app:hover {
  transform: translateY(-3px);
  background: var(--color-gold-light);
  color: #111111 !important;
}

.app-meta-box {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  backdrop-filter: blur(8px);
}

.app-meta-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.88rem;
}
.app-meta-row:last-child {
  border-bottom: none;
}
.app-meta-label {
  color: rgba(255, 255, 255, 0.65);
}
.app-meta-val {
  font-weight: 600;
  color: #ffffff;
}

/* ==========================================================================
   頁尾 (Footer)
   ========================================================================== */
.site-footer {
  background: var(--bg-card-alt);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2.5rem;
  margin-top: 3rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 320px;
}

.footer-col-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1.2rem;
  letter-spacing: 0.5px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.84rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copyright a {
  color: var(--text-secondary);
  font-weight: 600;
}

/* ==========================================================================
   手機與平板響應式設計 (Responsive Styles)
   ========================================================================== */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .formats-row {
    grid-template-columns: repeat(3, 1fr);
  }

  .specs-detail-grid {
    grid-template-columns: 1fr;
  }

  .download-banner {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.2rem;
    box-shadow: var(--shadow-md);
  }

  .nav-links.nav-open {
    display: flex;
  }

  .nav-toggle-btn {
    display: block;
  }

  .hero-title {
    font-size: 2.2rem;
  }

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

  .formats-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .legal-article-card {
    padding: 1.8rem 1.4rem;
  }

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

/* 列印模式最佳化（法規與條款方便列印或存為 PDF） */
@media print {
  .site-header, .site-footer, .hero-section, .features-section, .specs-section, .download-section, .nav-actions, .legal-actions {
    display: none !important;
  }
  .legal-container, .legal-article-card {
    padding: 0 !important;
    border: none !important;
    box-shadow: none !important;
    background: #fff !important;
    color: #000 !important;
  }
}