/* ==========================================================================
   SSRDOG 网络服务 - 原创陶瓷拼贴美学设计系统
   Palette:
   - Chalk: #F8F5EF (主背景 / 柔白瓷胎)
   - Ceramic Blue: #285B8A (主品牌 / 霁蓝釉)
   - Jade: #6B9A89 (辅助绿 / 龙泉青瓷)
   - Terracotta: #C77D63 (高亮赭 / 温润陶土)
   ========================================================================== */

:root {
  --color-chalk: #F8F5EF;
  --color-chalk-soft: #F1EDE4;
  --color-chalk-pure: #FAF8F5;
  --color-ceramic-blue: #285B8A;
  --color-ceramic-blue-hover: #1F4970;
  --color-ceramic-blue-light: #EBF2F8;
  --color-ceramic-blue-tint: rgba(40, 91, 138, 0.08);
  --color-jade: #6B9A89;
  --color-jade-dark: #4F7668;
  --color-jade-light: #EEF5F2;
  --color-terracotta: #C77D63;
  --color-terracotta-dark: #A96249;
  --color-terracotta-light: #FBF2EF;
  --color-ink: #22292F;
  --color-ink-light: #525C65;
  --color-ink-muted: #7A8692;
  --color-border: #E3DCD1;
  --color-border-dark: #D4CBBD;
  --color-white: #FFFFFF;
  --color-shadow: rgba(40, 91, 138, 0.08);
  --color-shadow-hover: rgba(40, 91, 138, 0.16);

  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, "Courier New", monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-tile: 12px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* 基础重置与排版规范 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-chalk);
  color: var(--color-ink);
  line-height: 1.7;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 100% 0%, rgba(107, 154, 137, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 0% 50%, rgba(199, 125, 99, 0.04) 0%, transparent 40%),
    linear-gradient(rgba(227, 220, 209, 0.25) 1px, transparent 1px),
    linear-gradient(90deg, rgba(227, 220, 209, 0.25) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
}

/* 标题系统 - 中文衬线体 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-ceramic-blue);
  line-height: 1.35;
  letter-spacing: 0.02em;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.85rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-ceramic-blue);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

/* 无障碍可见焦点 */
:focus-visible {
  outline: 3px solid var(--color-ceramic-blue);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-ceramic-blue);
  color: var(--color-chalk-pure);
  box-shadow: 0 4px 12px rgba(40, 91, 138, 0.2);
  border-color: #204b73;
}

.btn-primary:hover {
  background-color: var(--color-ceramic-blue-hover);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(40, 91, 138, 0.28);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-ceramic-blue);
  border: 1px solid var(--color-border-dark);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.btn-secondary:hover {
  background-color: var(--color-chalk-soft);
  border-color: var(--color-ceramic-blue);
  color: var(--color-ceramic-blue-hover);
  transform: translateY(-2px);
}

.btn-terracotta {
  background-color: var(--color-terracotta);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(199, 125, 99, 0.25);
}

.btn-terracotta:hover {
  background-color: var(--color-terracotta-dark);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
}

/* 陶瓷瓷片徽标 & 标签 */
.tile-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  border: 1px solid currentColor;
}

.badge-blue {
  background-color: var(--color-ceramic-blue-light);
  color: var(--color-ceramic-blue);
  border-color: rgba(40, 91, 138, 0.3);
}

.badge-jade {
  background-color: var(--color-jade-light);
  color: var(--color-jade-dark);
  border-color: rgba(107, 154, 137, 0.3);
}

.badge-terracotta {
  background-color: var(--color-terracotta-light);
  color: var(--color-terracotta-dark);
  border-color: rgba(199, 125, 99, 0.3);
}

/* 陶瓷卡片公共修饰器 */
.ceramic-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-tile);
  box-shadow: 0 4px 16px var(--color-shadow);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.ceramic-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-ceramic-blue), var(--color-jade), var(--color-terracotta));
  opacity: 0.8;
}

.ceramic-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px var(--color-shadow-hover);
  border-color: var(--color-ceramic-blue);
}

/* 导航栏 Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(248, 245, 239, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.logo-tile {
  width: 36px;
  height: 36px;
  background-color: var(--color-ceramic-blue);
  border: 2px solid var(--color-chalk);
  box-shadow: 0 2px 6px rgba(40, 91, 138, 0.25);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.logo-tile::after {
  content: "";
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-jade);
  transform: rotate(45deg);
}

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

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-ceramic-blue);
  line-height: 1.1;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--color-ink-muted);
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-ink);
  padding: 0.4rem 0.2rem;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-ceramic-blue);
  transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* 汉堡移动端菜单触发器 */
.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-ceramic-blue);
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
}

/* Hero 英雄区 */
.hero-section {
  padding: 4rem 0 3.5rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  width: fit-content;
}

.hero-title {
  font-size: 2.75rem;
  line-height: 1.2;
  color: var(--color-ceramic-blue);
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--color-ink-light);
  line-height: 1.8;
  margin-bottom: 0.5rem;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

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

.metric-item {
  display: flex;
  flex-direction: column;
}

.metric-value {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-ceramic-blue);
}

.metric-label {
  font-size: 0.8rem;
  color: var(--color-ink-muted);
}

/* Hero 右侧：六片陶瓷拼贴交互演示区 (6-Tile Game Arrangement) */
.hero-tiles-box {
  background-color: var(--color-chalk-pure);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: 0 12px 32px rgba(40, 91, 138, 0.08);
  position: relative;
}

.hero-tiles-box::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px dashed var(--color-border);
  border-radius: calc(var(--radius-lg) - 4px);
  pointer-events: none;
}

.tiles-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  position: relative;
  z-index: 2;
}

.tiles-title {
  font-size: 1.15rem;
  font-family: var(--font-serif);
  color: var(--color-ceramic-blue);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tiles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  position: relative;
  z-index: 2;
}

/* 瓷片卡片组件 */
.tile-button {
  aspect-ratio: 1 / 1;
  background-color: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-tile);
  cursor: pointer;
  position: relative;
  padding: 0;
  perspective: 600px;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.04);
}

.tile-button:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: var(--color-ceramic-blue);
  box-shadow: 0 6px 14px rgba(40, 91, 138, 0.15);
}

.tile-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

.tile-button.is-flipped .tile-inner,
.tile-button.is-matched .tile-inner {
  transform: rotateY(180deg);
}

.tile-front, .tile-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: calc(var(--radius-tile) - 2px);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* 瓷片背面（默认未翻开：陶艺釉印） */
.tile-front {
  background-color: var(--color-chalk-soft);
  background-image: 
    radial-gradient(circle at center, rgba(40, 91, 138, 0.06) 0%, transparent 60%),
    repeating-linear-gradient(45deg, rgba(227, 220, 209, 0.3) 0, rgba(227, 220, 209, 0.3) 2px, transparent 2px, transparent 8px);
  border: 1px solid var(--color-border-dark);
}

.tile-seal {
  width: 38px;
  height: 38px;
  border: 1.5px solid var(--color-ceramic-blue);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-ceramic-blue);
  background-color: var(--color-white);
  box-shadow: inset 0 0 4px rgba(40, 91, 138, 0.1);
}

/* 瓷片正面（翻开展示原创抽象几何纹样） */
.tile-back {
  transform: rotateY(180deg);
  background-color: var(--color-white);
  border: 2px solid currentColor;
}

.tile-pattern-svg {
  width: 100%;
  height: 100%;
}

.tile-button.is-matched {
  border-color: var(--color-jade);
  box-shadow: 0 0 0 3px rgba(107, 154, 137, 0.25);
  cursor: default;
}

.tiles-controls {
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  position: relative;
  z-index: 2;
}

.tiles-status {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-ink-light);
}

.tiles-notice {
  margin-top: 0.75rem;
  font-size: 0.76rem;
  color: var(--color-ink-muted);
  line-height: 1.5;
  background-color: rgba(227, 220, 209, 0.25);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-jade);
  position: relative;
  z-index: 2;
}

/* 节段通用标题 */
.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 3rem;
}

.section-header .tile-badge {
  margin-bottom: 0.75rem;
}

.section-title {
  margin-bottom: 0.75rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-ink-light);
  line-height: 1.7;
}

/* 核心产品优势（三条编辑式横幅 - Editorial Bands） */
.features-section {
  padding: 5rem 0;
  background-color: var(--color-chalk-soft);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.editorial-bands {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.editorial-band {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-tile);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  display: grid;
  grid-template-columns: 80px 1fr 1fr;
  align-items: center;
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.editorial-band:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--color-shadow);
}

.band-index {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  border-right: 1px solid var(--color-border);
  background-color: var(--color-chalk-pure);
}

.band-blue .band-index { color: var(--color-ceramic-blue); }
.band-jade .band-index { color: var(--color-jade-dark); }
.band-terracotta .band-index { color: var(--color-terracotta); }

.band-content {
  padding: 2rem;
}

.band-title {
  font-size: 1.35rem;
  margin-bottom: 0.6rem;
}

.band-desc {
  font-size: 0.95rem;
  color: var(--color-ink-light);
  line-height: 1.7;
  margin-bottom: 0;
}

.band-illustration {
  padding: 2rem;
  background-color: var(--color-chalk-pure);
  border-left: 1px solid var(--color-border);
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.spec-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.spec-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--color-ink-light);
}

.spec-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* 节点网络与图解路线 (Illustrated Route) */
.network-section {
  padding: 5rem 0;
  position: relative;
}

.route-container {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: 0 6px 20px var(--color-shadow);
  margin-bottom: 3rem;
}

.route-header {
  text-align: center;
  margin-bottom: 2rem;
}

.route-pipeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  position: relative;
  align-items: center;
}

.route-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 2;
}

.route-node-icon {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-tile);
  background-color: var(--color-chalk-pure);
  border: 2px solid var(--color-ceramic-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
  box-shadow: 0 4px 10px rgba(40, 91, 138, 0.12);
  color: var(--color-ceramic-blue);
}

.step-special .route-node-icon {
  border-color: var(--color-terracotta);
  color: var(--color-terracotta);
}

.step-jade .route-node-icon {
  border-color: var(--color-jade);
  color: var(--color-jade);
}

.route-step-name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  color: var(--color-ceramic-blue);
}

.route-step-detail {
  font-size: 0.8rem;
  color: var(--color-ink-muted);
  line-height: 1.5;
}

/* 连接管线示意 */
.route-step:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -0.75rem;
  top: 1.5rem;
  font-size: 1.5rem;
  color: var(--color-border-dark);
  font-weight: bold;
}

/* 节点矩阵表 */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.node-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: all var(--transition-fast);
}

.node-card:hover {
  border-color: var(--color-ceramic-blue);
  box-shadow: 0 4px 12px var(--color-shadow);
}

.node-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-region {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-family: var(--font-serif);
  font-size: 1.05rem;
}

.node-flag {
  font-size: 1.25rem;
}

.node-meta {
  font-size: 0.82rem;
  color: var(--color-ink-light);
  line-height: 1.6;
}

.node-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.node-tag {
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  background-color: var(--color-chalk-soft);
  border-radius: 3px;
  color: var(--color-ink-light);
}

/* AI与流媒体分屏阅读面板 (AI & Streaming Split Panels) */
.split-panels-section {
  padding: 5rem 0;
  background-color: var(--color-chalk-soft);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.split-panels-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.split-panel {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.04);
}

.panel-ai {
  border-top: 4px solid var(--color-ceramic-blue);
}

.panel-streaming {
  border-top: 4px solid var(--color-terracotta);
}

.panel-header {
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.panel-apps-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.app-pill {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 0.85rem;
  background-color: var(--color-chalk-pure);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
}

.app-icon-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-ceramic-blue);
}

.panel-streaming .app-icon-dot {
  background-color: var(--color-terracotta);
}

.panel-section-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.panel-advice-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.panel-advice-item {
  font-size: 0.88rem;
  color: var(--color-ink-light);
  line-height: 1.6;
  padding-left: 1.25rem;
  position: relative;
}

.panel-advice-item::before {
  content: "•";
  position: absolute;
  left: 0;
  top: 0;
  font-size: 1.2rem;
  color: var(--color-ceramic-blue);
}

.panel-streaming .panel-advice-item::before {
  color: var(--color-terracotta);
}

/* 套餐价格表 (Pricing Table) */
.pricing-section {
  padding: 5rem 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px var(--color-shadow);
}

/* 推荐套餐高亮列 */
.pricing-card.is-featured {
  border: 2px solid var(--color-ceramic-blue);
  box-shadow: 0 10px 28px rgba(40, 91, 138, 0.18);
  background: linear-gradient(180deg, #FFFFFF 0%, #F5F9FC 100%);
  transform: scale(1.03);
  z-index: 2;
}

.featured-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-ceramic-blue);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 1rem;
  border-radius: 12px;
  box-shadow: 0 2px 6px rgba(40, 91, 138, 0.3);
  white-space: nowrap;
}

.plan-header {
  margin-bottom: 1.25rem;
  text-align: center;
}

.plan-name {
  font-size: 1.35rem;
  margin-bottom: 0.35rem;
}

.plan-desc {
  font-size: 0.82rem;
  color: var(--color-ink-muted);
}

.plan-price-box {
  margin: 1rem 0 1.5rem;
  text-align: center;
  padding: 1rem 0;
  border-top: 1px dashed var(--color-border);
  border-bottom: 1px dashed var(--color-border);
}

.plan-price {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-ceramic-blue);
}

.plan-period {
  font-size: 0.85rem;
  color: var(--color-ink-muted);
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1.75rem;
  flex-grow: 1;
}

.plan-feature-item {
  font-size: 0.88rem;
  color: var(--color-ink-light);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.plan-feature-icon {
  width: 16px;
  height: 16px;
  color: var(--color-jade-dark);
  flex-shrink: 0;
}

.pricing-disclaimer {
  margin-top: 2.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-ink-muted);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  padding: 0.85rem 1.25rem;
  background-color: var(--color-chalk-soft);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

/* 博客文章九宫格 (9 Article Cards immediately after pricing) */
.articles-section {
  padding: 5rem 0;
  background-color: var(--color-chalk-soft);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* 桌面 3x3 */
  gap: 1.75rem;
}

.article-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-tile);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px var(--color-shadow);
  border-color: var(--color-ceramic-blue);
}

.article-card-media {
  height: 120px;
  background-color: var(--color-chalk-pure);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.article-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.78rem;
  color: var(--color-ink-muted);
  margin-bottom: 0.65rem;
}

.article-title {
  font-size: 1.18rem;
  margin-bottom: 0.65rem;
  line-height: 1.4;
}

.article-title a {
  color: var(--color-ceramic-blue);
}

.article-title a:hover {
  color: var(--color-terracotta);
}

.article-excerpt {
  font-size: 0.88rem;
  color: var(--color-ink-light);
  line-height: 1.65;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  border-top: 1px dashed var(--color-border);
  font-size: 0.85rem;
  font-weight: 600;
}

/* 场景体验反馈与评价 (Testimonials - Labeled illustrative) */
.testimonials-section {
  padding: 5rem 0;
}

.testimonials-label-note {
  display: block;
  font-size: 0.82rem;
  color: var(--color-ink-muted);
  margin-top: 0.5rem;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.testimonial-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-tile);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
}

.testimonial-quote {
  font-size: 0.92rem;
  color: var(--color-ink-light);
  line-height: 1.7;
  flex-grow: 1;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--color-border);
}

.author-tile-avatar {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.95rem;
}

.avatar-blue { background-color: var(--color-ceramic-blue-light); color: var(--color-ceramic-blue); }
.avatar-jade { background-color: var(--color-jade-light); color: var(--color-jade-dark); }
.avatar-terra { background-color: var(--color-terracotta-light); color: var(--color-terracotta); }

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-ink);
}

.author-role {
  font-size: 0.76rem;
  color: var(--color-ink-muted);
}

/* 折叠手风琴 FAQ (Accordion FAQ) */
.faq-section {
  padding: 5rem 0;
  background-color: var(--color-chalk-soft);
  border-top: 1px solid var(--color-border);
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--color-ceramic-blue);
  box-shadow: 0 4px 12px var(--color-shadow);
}

.faq-question {
  padding: 1.25rem 1.5rem;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-ceramic-blue);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
  color: var(--color-ink-muted);
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
  color: var(--color-ceramic-blue);
}

.faq-answer {
  padding: 0 1.5rem 1.5rem;
  font-size: 0.95rem;
  color: var(--color-ink-light);
  line-height: 1.75;
  border-top: 1px dashed var(--color-border-light);
  padding-top: 1rem;
}

/* 紧凑页脚 Footer */
.site-footer {
  background-color: var(--color-white);
  border-top: 2px solid var(--color-border);
  padding: 4rem 0 2rem;
  color: var(--color-ink-light);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

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

.footer-heading {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ceramic-blue);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--color-ink-light);
}

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

.footer-recommendations {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.rec-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.84rem;
  padding: 0.4rem 0.65rem;
  background-color: var(--color-chalk-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-ceramic-blue);
  font-weight: 500;
}

.rec-link-badge:hover {
  background-color: var(--color-ceramic-blue-light);
  border-color: var(--color-ceramic-blue);
  color: var(--color-ceramic-blue);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-ink-muted);
}

/* ==========================================================================
   独立文章页面与子页面专属样式
   ========================================================================== */
.page-header {
  padding: 3rem 0 2rem;
  background-color: var(--color-chalk-soft);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  margin-bottom: 1rem;
}

.breadcrumb-nav a {
  color: var(--color-ink-light);
}

.breadcrumb-nav a:hover {
  color: var(--color-ceramic-blue);
}

.breadcrumb-separator {
  color: var(--color-border-dark);
}

.article-content-layout {
  padding: 3.5rem 0 5rem;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
}

.article-prose {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--color-ink);
}

.article-prose h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.article-prose h3 {
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

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

.article-prose li {
  margin-bottom: 0.4rem;
}

.article-prose blockquote {
  border-left: 4px solid var(--color-ceramic-blue);
  background-color: var(--color-chalk-soft);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--color-ink-light);
}

.article-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}

.article-prose th, .article-prose td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

.article-prose th {
  background-color: var(--color-chalk-soft);
  color: var(--color-ceramic-blue);
  font-family: var(--font-serif);
}

.article-prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background-color: var(--color-chalk-soft);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

.article-cta-box {
  margin: 3rem 0;
  background-color: var(--color-chalk-pure);
  border: 2px solid var(--color-ceramic-blue);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  box-shadow: 0 8px 24px var(--color-shadow);
}

.related-articles-box {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 2px solid var(--color-border);
}

.related-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.related-link-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.related-link-card:hover {
  border-color: var(--color-ceramic-blue);
  transform: translateY(-2px);
}

/* ==========================================================================
   响应式断点优化 (375px, 390px, 430px, 768px, 1024px, 1440px)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .editorial-band {
    grid-template-columns: 60px 1fr;
  }
  
  .band-illustration {
    grid-column: 1 / -1;
    border-left: none;
    border-top: 1px solid var(--color-border);
  }

  .route-pipeline {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .route-step:not(:last-child)::after {
    content: "↓";
    right: auto;
    bottom: -1rem;
    top: auto;
  }

  .split-panels-grid {
    grid-template-columns: 1fr;
  }

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

  .pricing-card.is-featured {
    transform: none;
  }

  .articles-grid {
    grid-template-columns: repeat(2, 1fr); /* 平板 2 列 */
  }

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

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-chalk-pure);
    flex-direction: column;
    padding: 1.5rem;
    border-bottom: 2px solid var(--color-border);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
    gap: 1rem;
    align-items: flex-start;
  }

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

  .hero-title {
    font-size: 2.1rem;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

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

  .articles-grid {
    grid-template-columns: 1fr; /* 移动端 1 列 */
  }

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

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

@media (max-width: 430px) {
  .hero-title {
    font-size: 1.85rem;
  }

  .hero-ctas {
    flex-direction: column;
    width: 100%;
  }

  .hero-ctas .btn {
    width: 100%;
  }

  .tiles-grid {
    gap: 0.5rem;
  }

  .editorial-band {
    grid-template-columns: 1fr;
  }

  .band-index {
    height: 48px;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .panel-apps-grid {
    grid-template-columns: 1fr;
  }
}

/* 动效减弱偏好支持 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}