/* ==========================================================================
   SSONE (ssone.lol)
   STYLE ㊿ — WATERCOLOR STORYBOOK DESIGN SYSTEM
   Visual Personality: 温柔、手工、治愈、有温度
   ========================================================================== */

:root {
  /* Color System */
  --c-paper: #FFF8E8;
  --c-paper-sheet: #FFFDF7;
  --c-paper-note: #FEF9ED;
  --c-paper-dark: #F5ECD7;
  --c-ink: #2C2A29;
  --c-ink-soft: #4A4643;
  --c-pencil: #78726D;
  --c-pencil-light: #A39C95;

  /* Watercolor Accent Palette */
  --c-sky: #7DB9DE;
  --c-sky-soft: #E5F1F8;
  --c-sky-deep: #4A90E2;
  --c-pink: #F5CAD6;
  --c-pink-soft: #FDF0F3;
  --c-sage: #8FBC94;
  --c-sage-soft: #EDF6EE;
  --c-yellow: #F9E79F;
  --c-yellow-soft: #FEF9E7;
  --c-lavender: #C5B4E3;
  --c-lavender-soft: #F3EFFB;
  --c-terracotta: #C8644A;
  --c-terracotta-soft: #F9ECE8;
  --c-terracotta-hover: #B34E35;

  /* Sketch Border Radius & Borders */
  --sketch-border: 1.5px solid #2C2A29;
  --sketch-border-subtle: 1.5px solid rgba(44, 42, 41, 0.2);
  --sketch-border-dashed: 2px dashed rgba(44, 42, 41, 0.35);
  
  --radius-hand-1: 255px 15px 225px 15px / 15px 225px 15px 255px;
  --radius-hand-2: 20px 255px 15px 245px / 245px 15px 255px 20px;
  --radius-hand-3: 15px 225px 20px 255px / 255px 20px 245px 15px;
  --radius-stamp: 8px;
  --radius-pill: 999px;

  /* Paper Shadows */
  --shadow-paper-sm: 2px 3px 0px rgba(44, 42, 41, 0.12);
  --shadow-paper-md: 3px 5px 0px rgba(44, 42, 41, 0.16);
  --shadow-paper-lg: 5px 8px 0px rgba(44, 42, 41, 0.18);
  --shadow-paper-lift: 6px 12px 16px rgba(44, 42, 41, 0.08), 2px 4px 0px rgba(44, 42, 41, 0.12);

  --font-storybook: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --container-max: 1140px;
  --transition-hand: 0.22s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Reset & Paper Canvas Background */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-storybook);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-ink);
  background-color: var(--c-paper);
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(200, 100, 74, 0.03) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(125, 185, 222, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(249, 231, 159, 0.03) 0%, transparent 50%);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

main {
  flex: 1;
}

a {
  color: var(--c-terracotta);
  text-decoration: none;
  transition: all var(--transition-hand);
}

a:hover {
  color: var(--c-terracotta-hover);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Handcrafted Chapter Number & Section Headers */
.chapter-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-terracotta);
  background: var(--c-paper-note);
  border: 1.5px solid var(--c-terracotta);
  border-radius: var(--radius-hand-1);
  padding: 0.3rem 0.9rem;
  margin-bottom: 1rem;
  box-shadow: 2px 2px 0px rgba(200, 100, 74, 0.2);
}

.chapter-number-circle {
  width: 18px;
  height: 18px;
  background-color: var(--c-terracotta);
  color: #fff;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
}

.section-head-storybook {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem auto;
}

.section-title-storybook {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--c-ink);
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin-bottom: 0.85rem;
  position: relative;
  display: inline-block;
}

.section-subtitle-storybook {
  font-size: 1.08rem;
  color: var(--c-ink-soft);
  line-height: 1.7;
}

/* Hand-drawn SVG Divider Lines */
.hand-divider {
  width: 100%;
  height: 24px;
  margin: 2.5rem 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hand-divider svg {
  width: 100%;
  max-width: 800px;
  height: 24px;
  stroke: rgba(44, 42, 41, 0.25);
  stroke-width: 1.5;
  fill: none;
}

/* Handcrafted CTA Buttons */
.btn-storybook {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-size: 1.05rem;
  font-weight: 700;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-hand-1);
  border: 2px solid var(--c-ink);
  background-color: var(--c-yellow);
  color: var(--c-ink);
  box-shadow: var(--shadow-paper-md);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-hand);
}

.btn-storybook:hover {
  background-color: #F7DC6F;
  transform: translateY(-2px) rotate(-0.5deg);
  box-shadow: var(--shadow-paper-lg);
  border-color: var(--c-ink);
  color: var(--c-ink);
}

.btn-storybook:active {
  transform: translateY(2px);
  box-shadow: var(--shadow-paper-sm);
}

.btn-storybook-primary {
  background-color: var(--c-terracotta);
  color: #ffffff;
  border-color: var(--c-ink);
  box-shadow: 3px 4px 0px var(--c-ink);
}

.btn-storybook-primary:hover {
  background-color: var(--c-terracotta-hover);
  color: #ffffff;
  transform: translateY(-2px) rotate(0.5deg);
  box-shadow: 4px 6px 0px var(--c-ink);
}

.btn-storybook-primary:active {
  transform: translateY(2px);
  box-shadow: 1px 2px 0px var(--c-ink);
}

.btn-storybook-outline {
  background-color: var(--c-paper-sheet);
  color: var(--c-ink);
  border: 2px solid var(--c-ink);
  box-shadow: var(--shadow-paper-sm);
}

.btn-storybook-outline:hover {
  background-color: var(--c-paper-note);
  transform: translateY(-2px);
  box-shadow: var(--shadow-paper-md);
  color: var(--c-terracotta);
}

.btn-block {
  width: 100%;
}

/* Washi Tape Accent */
.tape-strip {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%) rotate(-1.5deg);
  width: 90px;
  height: 24px;
  background-color: rgba(249, 231, 159, 0.75);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
  border-left: 2px dashed rgba(44, 42, 41, 0.15);
  border-right: 2px dashed rgba(44, 42, 41, 0.15);
  pointer-events: none;
  z-index: 2;
}

/* Storybook Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 248, 232, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--c-ink);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo-storybook {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--c-ink);
}

.brand-logo-storybook:hover {
  color: var(--c-terracotta);
}

.logo-badge-cat {
  width: 42px;
  height: 42px;
  background-color: var(--c-yellow);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-1);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 2px 2px 0px var(--c-ink);
  transform: rotate(-3deg);
  transition: transform var(--transition-hand);
}

.brand-logo-storybook:hover .logo-badge-cat {
  transform: rotate(4deg) scale(1.05);
}

/* Navigation like Table of Contents */
.nav-toc {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-toc a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-ink-soft);
  position: relative;
  padding: 0.3rem 0.2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-toc-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-terracotta);
  background-color: var(--c-paper-dark);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  border: 1px solid rgba(44, 42, 41, 0.2);
}

.nav-toc a:hover,
.nav-toc a.active {
  color: var(--c-ink);
}

.nav-toc a.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 8px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 20' preserveAspectRatio='none'%3E%3Cpath d='M0 10 Q 25 18 50 10 T 100 10' stroke='%23C8644A' stroke-width='3' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

.menu-toggle-btn {
  display: none;
  background: var(--c-paper-sheet);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-1);
  padding: 0.5rem;
  cursor: pointer;
  box-shadow: 2px 2px 0px var(--c-ink);
}

.mobile-menu-drawer {
  display: none;
  background-color: var(--c-paper);
  border-bottom: 2px solid var(--c-ink);
  padding: 1.5rem;
}

.mobile-menu-drawer.is-open {
  display: block;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ==========================================================================
   Hero: 大型手绘场景绘本开篇
   ========================================================================== */
.hero-storybook {
  padding: 4.5rem 0 3.5rem 0;
  position: relative;
}

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

.hero-chapter-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--c-terracotta);
  background-color: var(--c-paper-note);
  border: 1.5px solid var(--c-ink);
  border-radius: var(--radius-hand-2);
  padding: 0.35rem 0.95rem;
  box-shadow: 2px 3px 0px rgba(44, 42, 41, 0.15);
  margin-bottom: 1.25rem;
}

.hero-title-storybook {
  font-size: 2.85rem;
  font-weight: 900;
  line-height: 1.2;
  color: var(--c-ink);
  letter-spacing: -0.02em;
  margin-bottom: 1.2rem;
}

.hero-subtitle-storybook {
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--c-ink-soft);
  margin-bottom: 2.2rem;
}

.hero-cta-wrap {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.handwritten-annotation {
  font-size: 0.9rem;
  font-style: italic;
  color: var(--c-pencil);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.annotation-arrow {
  color: var(--c-terracotta);
  font-size: 1.1rem;
}

/* Hero 手绘明信片与实时网络手账 */
.hero-journal-card {
  background-color: var(--c-paper-sheet);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-1);
  padding: 2rem 1.8rem;
  box-shadow: var(--shadow-paper-lg);
  position: relative;
  transform: rotate(1deg);
  transition: transform var(--transition-hand);
}

.hero-journal-card:hover {
  transform: rotate(0deg) translateY(-3px);
}

.journal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1.5px dashed var(--c-ink);
}

.journal-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--c-ink);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.postage-stamp-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-terracotta);
  background-color: var(--c-terracotta-soft);
  border: 1.5px dashed var(--c-terracotta);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-stamp);
  transform: rotate(-2deg);
}

.journal-node-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.journal-node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.95rem;
  background-color: var(--c-paper-note);
  border: 1.5px solid var(--c-ink);
  border-radius: var(--radius-hand-2);
  font-size: 0.9rem;
}

.node-region-box {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
}

.node-flag-stamp {
  font-size: 0.75rem;
  padding: 0.15rem 0.4rem;
  background-color: var(--c-paper-dark);
  border: 1px solid var(--c-ink);
  border-radius: 4px;
}

.node-latency-ink {
  font-size: 0.85rem;
  font-weight: 700;
  color: #2E7D32;
  background-color: var(--c-sage-soft);
  border: 1px solid #81C784;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-pill);
}

/* ==========================================================================
   Section 01: 发现 · 服务生态卡片 (Botanical Field Notes)
   ========================================================================== */
.ecosystem-grid-storybook {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.field-note-card {
  background-color: var(--c-paper-sheet);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-2);
  padding: 1.75rem 1.4rem;
  box-shadow: var(--shadow-paper-sm);
  position: relative;
  transition: all var(--transition-hand);
}

.field-note-card:nth-child(even) {
  border-radius: var(--radius-hand-3);
  transform: rotate(0.8deg);
}

.field-note-card:nth-child(odd) {
  transform: rotate(-0.8deg);
}

.field-note-card:hover {
  transform: translateY(-4px) rotate(0deg);
  box-shadow: var(--shadow-paper-md);
  border-color: var(--c-ink);
}

.field-note-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-hand-1);
  border: 1.5px solid var(--c-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.15rem;
  box-shadow: 2px 2px 0px rgba(44, 42, 41, 0.1);
}

.bg-sky { background-color: var(--c-sky-soft); color: var(--c-sky-deep); }
.bg-pink { background-color: var(--c-pink-soft); color: #C2185B; }
.bg-sage { background-color: var(--c-sage-soft); color: #2E7D32; }
.bg-lavender { background-color: var(--c-lavender-soft); color: #6A1B9A; }

.field-note-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--c-ink);
  margin-bottom: 0.5rem;
}

.field-note-desc {
  font-size: 0.9rem;
  color: var(--c-ink-soft);
  line-height: 1.6;
}

/* ==========================================================================
   Section 02: 探秘 · 4 大核心特性 (Paper Notes with Tape)
   ========================================================================== */
.features-grid-storybook {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.2rem;
}

.paper-note-card {
  background-color: var(--c-paper-sheet);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-1);
  padding: 2.5rem 2rem 2rem 2rem;
  box-shadow: var(--shadow-paper-md);
  position: relative;
  transition: all var(--transition-hand);
}

.paper-note-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-paper-lg);
}

.paper-note-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.paper-note-icon-box {
  width: 44px;
  height: 44px;
  border: 2px solid var(--c-ink);
  border-radius: 50%;
  background-color: var(--c-yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 2px 2px 0px var(--c-ink);
}

.paper-note-header h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--c-ink);
}

.paper-note-card p {
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--c-ink-soft);
}

/* ==========================================================================
   Section 03: 场景 · 4 张日常旅程明信片 (Travel Postcards)
   ========================================================================== */
.scenarios-grid-storybook {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.travel-postcard {
  background-color: var(--c-paper-note);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-2);
  padding: 2rem;
  box-shadow: var(--shadow-paper-md);
  position: relative;
  transition: all var(--transition-hand);
}

.travel-postcard:hover {
  transform: translateY(-4px) rotate(0.5deg);
  box-shadow: var(--shadow-paper-lg);
}

.postcard-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1.5px dashed rgba(44, 42, 41, 0.3);
}

.postcard-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--c-ink);
}

.postcard-stamp {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--c-ink);
  background-color: var(--c-yellow);
  border: 1.5px solid var(--c-ink);
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  box-shadow: 1px 1px 0px var(--c-ink);
  transform: rotate(2deg);
}

.postcard-body {
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--c-ink-soft);
}

/* ==========================================================================
   Section 04: 匠心 · 3 维网络架构解析 (Notebook Pages)
   ========================================================================== */
.benefits-grid-storybook {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

.notebook-page-card {
  background-color: var(--c-paper-sheet);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-1);
  padding: 2rem 1.6rem;
  box-shadow: var(--shadow-paper-sm);
  position: relative;
  transition: all var(--transition-hand);
}

.notebook-page-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-paper-md);
}

.notebook-index-stamp {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--c-terracotta);
  background-color: var(--c-terracotta-soft);
  border: 1.5px solid var(--c-terracotta);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  margin-bottom: 0.85rem;
}

.notebook-page-card h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--c-ink);
  margin-bottom: 0.6rem;
}

.notebook-page-card p {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--c-ink-soft);
}

/* ==========================================================================
   Section 05: 约定 · 3 张旅行明信片方案 (Pricing Postcards)
   ========================================================================== */
.pricing-grid-storybook {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.pricing-postcard {
  background-color: var(--c-paper-sheet);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-2);
  padding: 2.5rem 1.8rem;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-paper-md);
  transition: all var(--transition-hand);
}

.pricing-postcard:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-paper-lg);
}

.pricing-postcard.featured {
  background-color: #FFFDF5;
  border-width: 2.5px;
  border-color: var(--c-ink);
  box-shadow: 5px 8px 0px var(--c-terracotta);
  transform: translateY(-6px);
}

.pricing-postcard.featured:hover {
  transform: translateY(-8px);
}

.most-loved-stamp {
  position: absolute;
  top: -14px;
  right: 18px;
  background-color: var(--c-terracotta);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-hand-1);
  border: 1.5px solid var(--c-ink);
  box-shadow: 2px 2px 0px var(--c-ink);
  transform: rotate(4deg);
}

.plan-title-storybook {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--c-ink);
  margin-bottom: 0.4rem;
}

.plan-audience-storybook {
  font-size: 0.86rem;
  color: var(--c-pencil);
  min-height: 42px;
  margin-bottom: 1.25rem;
}

.plan-price-storybook {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1.5px dashed var(--c-ink);
}

.currency-mark {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--c-ink);
}

.price-num-storybook {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--c-ink);
  line-height: 1;
}

.price-unit-storybook {
  font-size: 0.88rem;
  color: var(--c-pencil);
}

.plan-features-storybook {
  list-style: none;
  padding: 0;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  flex: 1;
}

.plan-features-storybook li {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.92rem;
  color: var(--c-ink);
}

.ink-check-mark {
  font-weight: 900;
  color: var(--c-terracotta);
}

/* ==========================================================================
   Section 06: 解惑 · 6 问常见问题手账 (FAQ Accordion)
   ========================================================================== */
.faq-wrap-storybook {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.faq-item-storybook {
  background-color: var(--c-paper-sheet);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-1);
  box-shadow: var(--shadow-paper-sm);
  overflow: hidden;
  transition: all var(--transition-hand);
}

.faq-item-storybook:hover {
  box-shadow: var(--shadow-paper-md);
}

.faq-btn-storybook {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.6rem;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--c-ink);
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  gap: 1rem;
}

.faq-arrow-icon {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-hand);
  color: var(--c-terracotta);
  flex-shrink: 0;
}

.faq-item-storybook.is-open .faq-arrow-icon {
  transform: rotate(180deg);
}

.faq-content-storybook {
  display: none;
  padding: 0 1.6rem 1.4rem 1.6rem;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--c-ink-soft);
  border-top: 1px dashed rgba(44, 42, 41, 0.2);
  margin-top: 0.2rem;
  padding-top: 0.85rem;
}

.faq-item-storybook.is-open .faq-content-storybook {
  display: block;
}

/* ==========================================================================
   Final CTA: 绘本结尾 · THE STORY STARTS HERE
   ========================================================================== */
.final-cover-section {
  padding: 5rem 0;
}

.final-book-cover {
  background-color: var(--c-paper-sheet);
  border: 2.5px solid var(--c-ink);
  border-radius: var(--radius-hand-1);
  padding: 4rem 2rem;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
  box-shadow: 6px 10px 0px var(--c-ink);
  position: relative;
}

.final-book-chapter {
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--c-terracotta);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.final-book-title {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--c-ink);
  line-height: 1.3;
  margin-bottom: 1rem;
}

.final-book-desc {
  font-size: 1.12rem;
  color: var(--c-ink-soft);
  max-width: 580px;
  margin: 0 auto 2.2rem auto;
  line-height: 1.7;
}

/* ==========================================================================
   Footer: 手账封底与出版信息
   ========================================================================== */
.site-footer-storybook {
  background-color: var(--c-paper-dark);
  border-top: 2px solid var(--c-ink);
  padding: 4rem 0 2rem 0;
  font-size: 0.9rem;
  color: var(--c-ink-soft);
}

.footer-grid-storybook {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-brand-box h4 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--c-ink);
  margin-bottom: 0.85rem;
}

.footer-brand-box p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--c-ink-soft);
}

.footer-col-storybook h4 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--c-ink);
  margin-bottom: 1rem;
  border-bottom: 1.5px dashed var(--c-ink);
  padding-bottom: 0.4rem;
}

.footer-col-storybook ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-col-storybook a {
  color: var(--c-ink-soft);
}

.footer-col-storybook a:hover {
  color: var(--c-terracotta);
}

.footer-disclaimer-box {
  padding: 1.25rem;
  background-color: var(--c-paper-note);
  border: 1.5px dashed var(--c-ink);
  border-radius: var(--radius-hand-2);
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--c-pencil);
  margin-bottom: 1.75rem;
}

.footer-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
}

/* ==========================================================================
   Mobile Sticky CTA
   ========================================================================== */
.mobile-sticky-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 40;
  background-color: rgba(255, 248, 232, 0.96);
  backdrop-filter: blur(8px);
  border-top: 2px solid var(--c-ink);
  padding: 0.75rem 1.25rem;
  box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.08);
}

/* ==========================================================================
   Article & Documentation Page Styles
   ========================================================================== */
.page-header-storybook {
  padding: 3.5rem 0 2rem 0;
  background-color: var(--c-paper-sheet);
  border-bottom: 2px solid var(--c-ink);
  margin-bottom: 2.5rem;
}

.breadcrumb-storybook {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--c-pencil);
  margin-bottom: 1rem;
}

.breadcrumb-storybook a {
  color: var(--c-pencil);
}

.breadcrumb-storybook a:hover {
  color: var(--c-terracotta);
}

.article-layout-grid {
  display: grid;
  grid-template-columns: 1fr 310px;
  gap: 2.5rem;
  padding-bottom: 4rem;
}

.article-paper-body {
  background-color: var(--c-paper-sheet);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-1);
  padding: 2.75rem;
  box-shadow: var(--shadow-paper-md);
}

.article-lead-note {
  background-color: var(--c-yellow-soft);
  border: 1.5px solid var(--c-ink);
  border-radius: var(--radius-hand-2);
  padding: 1.35rem 1.6rem;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--c-ink);
  margin-bottom: 2.2rem;
  box-shadow: 2px 2px 0px rgba(44, 42, 41, 0.1);
}

.article-prose h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--c-ink);
  margin: 2.4rem 0 1rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1.5px dashed var(--c-ink);
}

.article-prose h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--c-ink);
  margin: 1.8rem 0 0.85rem 0;
}

.article-prose p {
  margin-bottom: 1.25rem;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

.article-prose ul, .article-prose ol {
  margin-bottom: 1.35rem;
  padding-left: 1.5rem;
}

.article-prose li {
  margin-bottom: 0.5rem;
  line-height: 1.75;
  color: var(--c-ink-soft);
}

.article-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.8rem 0;
  background-color: var(--c-paper-note);
  border: 2px solid var(--c-ink);
  border-radius: 8px;
}

.article-prose th, .article-prose td {
  padding: 0.85rem 1.1rem;
  border: 1px solid var(--c-ink);
  text-align: left;
}

.article-prose th {
  background-color: var(--c-paper-dark);
  font-weight: 800;
  color: var(--c-ink);
}

.article-callout-storybook {
  background-color: var(--c-paper-note);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-2);
  padding: 1.35rem 1.5rem;
  margin: 1.8rem 0;
  box-shadow: 2px 3px 0px rgba(44, 42, 41, 0.1);
}

.article-sidebar-widget {
  background-color: var(--c-paper-sheet);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand-2);
  padding: 1.6rem;
  box-shadow: var(--shadow-paper-sm);
  margin-bottom: 1.8rem;
}

.article-sidebar-widget h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--c-ink);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1.5px dashed var(--c-ink);
}

.article-sidebar-widget ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.article-sidebar-widget a {
  font-size: 0.92rem;
  color: var(--c-ink-soft);
}

.article-sidebar-widget a:hover {
  color: var(--c-terracotta);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 992px) {
  .hero-grid-storybook {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

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

  .pricing-grid-storybook {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }

  .benefits-grid-storybook {
    grid-template-columns: 1fr;
  }

  .article-layout-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid-storybook {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-toc,
  .header-actions .btn-storybook {
    display: none;
  }

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

  .hero-title-storybook {
    font-size: 2.15rem;
  }

  .ecosystem-grid-storybook {
    grid-template-columns: 1fr;
  }

  .article-paper-body {
    padding: 1.5rem 1.25rem;
  }

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

  .mobile-sticky-cta {
    display: block;
  }

  body {
    padding-bottom: 68px;
  }
}


/* --- 流媒体与 AI 生态手账徽章 --- */
.ecosystem-service-row {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.service-support-card {
  background: var(--c-paper);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius-hand);
  padding: 1.5rem;
  box-shadow: var(--shadow-paper);
  position: relative;
}
.service-badge-stamp {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  background: var(--c-butter);
  border: 1.5px solid var(--c-ink);
  border-radius: var(--radius-hand);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--c-ink);
  box-shadow: 1px 1px 0 var(--c-ink);
  margin-right: 0.35rem;
  margin-bottom: 0.35rem;
}
@media (max-width: 768px) {
  .ecosystem-service-row {
    grid-template-columns: 1fr;
  }
}