/* ==========================================================================
   一元机场 (1yuanjichang.fun) 核心样式表
   设计规范：STYLE 63 — WILD WEST FRONTIER (西部拓荒海报与旧地图视觉系统)
   配色系统：
     - Dusty Sand (荒漠沙): #D8C09A
     - Parchment (羊皮纸): #F2E4C8
     - Light Parchment (浅奶油纸): #FAF3E3
     - Saddle Brown (马鞍棕): #70472E
     - Dark Walnut (深胡桃木): #33251D
     - Rust Red (铁锈红印章): #A7432E
     - Sage (鼠尾草绿): #788066
   ========================================================================== */

:root {
  --dusty-sand: #D8C09A;
  --parchment: #F2E4C8;
  --parchment-light: #FAF3E3;
  --saddle-brown: #70472E;
  --dark-walnut: #33251D;
  --rust-red: #A7432E;
  --rust-red-dark: #8B3522;
  --sage: #788066;

  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-slab: Georgia, "Songti SC", "STSong", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;

  --container-width: 1140px;
  --header-height: 74px;
}

*, *::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(--parchment);
  background-image: 
    radial-gradient(rgba(112, 71, 46, 0.06) 1px, transparent 0),
    linear-gradient(180deg, rgba(216, 192, 154, 0.28) 0%, rgba(242, 228, 200, 0.9) 100%);
  background-size: 24px 24px, 100% 100%;
  color: var(--dark-walnut);
  line-height: 1.68;
  overflow-x: hidden;
}

/* 基础版心 */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 链接与手绘下划线效果 (Hand-drawn Underline) */
a {
  color: var(--rust-red);
  text-decoration: none;
  font-weight: 600;
  background-image: linear-gradient(var(--rust-red), var(--rust-red));
  background-position: 0% 100%;
  background-repeat: no-repeat;
  background-size: 0% 2px;
  transition: background-size 0.22s ease, color 0.18s ease;
}

a:hover {
  color: var(--dark-walnut);
  background-size: 100% 2px;
}

img, svg {
  vertical-align: middle;
  max-width: 100%;
  height: auto;
}

/* 西部衬线与海报大标题层级 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-slab);
  color: var(--dark-walnut);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

p {
  margin-bottom: 1.15rem;
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.4rem;
}

li {
  margin-bottom: 0.45rem;
}

/* ==========================================================================
   按钮规范：CTA STATIC / HOVER / STAMP PRESS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 26px;
  font-family: var(--font-slab);
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  border-radius: 2px;
  border: 2px solid var(--dark-walnut);
  cursor: pointer;
  background-image: none !important;
  text-decoration: none !important;
  position: relative;
  transition: transform 0.16s cubic-bezier(0.2, 0.8, 0.2, 1), background-color 0.16s ease, box-shadow 0.16s ease, color 0.16s ease;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 3px dashed var(--rust-red);
  outline-offset: 3px;
}

/* 主 CTA：Rust Red 背景 + Cream 文字 + 粗边框 + 纸张硬阴影 */
.btn-primary {
  background-color: var(--rust-red);
  color: var(--parchment-light) !important;
  box-shadow: 4px 4px 0px var(--dark-walnut);
}

/* Hover：向右移动 3px + 右下方硬阴影 + 背景切换为 Dark Walnut */
.btn-primary:hover {
  transform: translateX(3px);
  background-color: var(--dark-walnut);
  color: var(--parchment-light) !important;
  box-shadow: 6px 6px 0px var(--saddle-brown);
}

/* Click / Active：Stamp Press 压印效果 */
.btn-primary:active {
  transform: translate(4px, 4px) scale(0.98);
  box-shadow: 1px 1px 0px var(--dark-walnut);
}

/* 次要按钮：羊皮纸边框款 */
.btn-outline {
  background-color: var(--parchment-light);
  color: var(--dark-walnut) !important;
  border: 2px solid var(--saddle-brown);
  box-shadow: 3px 3px 0px var(--dusty-sand);
}

.btn-outline:hover {
  transform: translateX(3px);
  background-color: var(--dark-walnut);
  color: var(--parchment-light) !important;
  border-color: var(--dark-walnut);
  box-shadow: 5px 5px 0px var(--saddle-brown);
}

.btn-outline:active {
  transform: translate(3px, 3px) scale(0.98);
  box-shadow: 1px 1px 0px var(--dark-walnut);
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   导航头部 HEADER (旧西部驿站招牌与 Rust Red 印章)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(242, 228, 200, 0.96);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-bottom: 3px double var(--dark-walnut);
  height: var(--header-height);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-slab);
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--dark-walnut) !important;
  background-image: none !important;
  letter-spacing: 0.03em;
}

.brand-logo svg {
  width: 36px;
  height: 36px;
  transition: transform 0.25s ease;
}

.brand-logo:hover svg {
  transform: rotate(-8deg) scale(1.05);
}

.site-nav {
  display: none;
}

.nav-list {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 22px;
  margin-bottom: 0;
  padding-left: 0;
}

.nav-link {
  font-family: var(--font-slab);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--dark-walnut);
  padding: 4px 10px;
  border: 1.5px solid transparent;
  background-image: none !important;
  transition: all 0.18s ease;
}

.nav-link:hover {
  color: var(--rust-red);
  border-bottom-color: var(--rust-red);
}

/* Active 使用小型 Rust Red 印章 */
.nav-link.active {
  background-color: var(--rust-red);
  color: var(--parchment-light) !important;
  border: 1.5px solid var(--dark-walnut);
  box-shadow: 2px 2px 0px var(--dark-walnut);
  transform: rotate(-1.5deg);
}

.header-cta {
  display: none;
}

/* 移动端汉堡按钮 */
.mobile-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 44px;
  height: 44px;
  padding: 12px 10px;
  background: var(--parchment-light);
  border: 2px solid var(--dark-walnut);
  box-shadow: 2px 2px 0px var(--dark-walnut);
  cursor: pointer;
}

.mobile-toggle span {
  display: block;
  height: 2.5px;
  width: 100%;
  background-color: var(--dark-walnut);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.mobile-toggle.is-active span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.mobile-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.is-active span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* 移动端导航展开 */
.site-nav.nav-open {
  display: block;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--parchment-light);
  border-bottom: 3px solid var(--dark-walnut);
  padding: 20px;
  box-shadow: 0 12px 0px rgba(51, 37, 29, 0.18);
}

.site-nav.nav-open .nav-list {
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.site-nav.nav-open .nav-link {
  font-size: 1.05rem;
  display: block;
  width: 100%;
  padding: 8px 12px;
}

/* ==========================================================================
   首屏 HERO 模块：荒漠、山脉、旧地图与复古通告海报
   ========================================================================== */
.hero-section {
  padding: 44px 0 56px;
  background-color: var(--parchment);
  border-bottom: 3px double var(--saddle-brown);
  position: relative;
  overflow: hidden;
}

.hero-poster-frame {
  background-color: var(--parchment-light);
  border: 3px solid var(--dark-walnut);
  outline: 1.5px solid var(--saddle-brown);
  outline-offset: -8px;
  padding: 36px 24px;
  box-shadow: 8px 8px 0px var(--dusty-sand);
  position: relative;
}

/* 打字机风格元数据标签 */
.frontier-meta-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--dark-walnut);
  padding-bottom: 12px;
  margin-bottom: 28px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--saddle-brown);
}

.stamp-badge {
  display: inline-block;
  background-color: var(--rust-red);
  color: var(--parchment-light);
  border: 1.5px solid var(--dark-walnut);
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  box-shadow: 2px 2px 0px var(--dark-walnut);
  transition: transform 0.2s ease;
}

.stamp-badge:hover {
  transform: rotate(-4deg) scale(1.05);
}

.hero-wrapper {
  max-width: 840px;
  margin: 0 auto;
  text-align: center;
}

.hero-title {
  font-size: 2.25rem;
  line-height: 1.22;
  margin-bottom: 18px;
  color: var(--dark-walnut);
  text-shadow: 2px 2px 0px var(--dusty-sand);
}

.hero-subtitle {
  font-size: 1.08rem;
  color: var(--saddle-brown);
  font-weight: 500;
  line-height: 1.65;
  margin-bottom: 28px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
  justify-content: center;
  align-items: center;
  margin-bottom: 32px;
}

/* 旧地图与荒漠山脉路线视觉区 */
.frontier-map-panel {
  background-color: var(--parchment);
  border: 2px solid var(--saddle-brown);
  padding: 18px;
  margin: 0 auto 28px;
  max-width: 760px;
  position: relative;
}

.frontier-map-svg {
  width: 100%;
  height: auto;
  display: block;
}

.map-route-line {
  stroke-dasharray: 8 6;
  animation: routePulse 12s linear infinite;
}

@keyframes routePulse {
  from {
    stroke-dashoffset: 140;
  }
  to {
    stroke-dashoffset: 0;
  }
}

.compass-rose {
  transform-origin: center;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.frontier-map-panel:hover .compass-rose {
  transform: rotate(45deg);
}

.map-waypoints {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--saddle-brown);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--dark-walnut);
}

.waypoint-node {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.waypoint-dot {
  width: 8px;
  height: 8px;
  background-color: var(--rust-red);
  border: 1.5px solid var(--dark-walnut);
  display: inline-block;
}

.hero-meta-trust {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 18px;
  padding-top: 18px;
  border-top: 2px dashed var(--saddle-brown);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--dark-walnut);
}

.trust-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.trust-item svg {
  width: 18px;
  height: 18px;
  color: var(--rust-red);
}

/* ==========================================================================
   模块通用样式：大编号 (Large Section Numbers) 与装饰绳索分隔线
   ========================================================================== */
.content-section {
  padding: 60px 0;
  border-bottom: 2px solid var(--saddle-brown);
}

.content-section.bg-alt {
  background-color: rgba(216, 192, 154, 0.35);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 44px;
  position: relative;
}

.section-num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-slab);
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--parchment-light);
  background-color: var(--dark-walnut);
  border: 2px solid var(--saddle-brown);
  padding: 2px 14px;
  margin-bottom: 12px;
  box-shadow: 3px 3px 0px var(--rust-red);
}

.section-title {
  font-size: 1.9rem;
  margin-bottom: 12px;
  color: var(--dark-walnut);
}

.section-intro {
  font-size: 1rem;
  color: var(--saddle-brown);
  font-weight: 500;
  margin-bottom: 14px;
}

.frontier-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 12px auto 0;
  max-width: 240px;
}

.frontier-divider::before,
.frontier-divider::after {
  content: "";
  flex: 1;
  height: 2px;
  background-color: var(--saddle-brown);
}

.frontier-divider-diamond {
  width: 8px;
  height: 8px;
  background-color: var(--rust-red);
  transform: rotate(45deg);
}

/* ==========================================================================
   CARDS：Frontier Notice 拓荒布告栏卡片（禁止玻璃/现代悬浮卡）
   ========================================================================== */
.platforms-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.platform-card,
.feature-item,
.scenario-card,
.article-card {
  background-color: var(--parchment-light);
  border: 2px solid var(--dark-walnut);
  outline: 1px dashed var(--saddle-brown);
  outline-offset: -6px;
  padding: 26px 22px;
  box-shadow: 5px 5px 0px var(--dusty-sand);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  position: relative;
}

/* Hover Card -> Paper Lift */
.platform-card:hover,
.feature-item:hover,
.scenario-card:hover,
.article-card:hover {
  transform: translateY(-3px);
  box-shadow: 7px 7px 0px var(--saddle-brown);
}

.card-num {
  font-family: var(--font-slab);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--rust-red);
  line-height: 1;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1.5px solid var(--dusty-sand);
  padding-bottom: 8px;
}

.platform-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-slab);
  font-weight: 800;
  color: var(--dark-walnut);
  font-size: 1.18rem;
  margin-bottom: 8px;
}

.platform-header svg {
  width: 24px;
  height: 24px;
  color: var(--rust-red);
  flex-shrink: 0;
}

.platform-desc {
  font-size: 0.94rem;
  color: var(--dark-walnut);
  margin-bottom: 12px;
}

.platform-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--saddle-brown);
}

.platform-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 2px 8px;
  background-color: var(--parchment);
  color: var(--dark-walnut);
  border: 1px solid var(--saddle-brown);
}

/* 特性卡 FEATURES */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.feature-icon-box {
  width: 46px;
  height: 46px;
  background-color: var(--parchment);
  border: 2px solid var(--dark-walnut);
  box-shadow: 3px 3px 0px var(--rust-red);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--dark-walnut);
}

.feature-icon-box svg {
  width: 24px;
  height: 24px;
}

.feature-title {
  font-size: 1.22rem;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1.5px solid var(--dusty-sand);
}

.feature-text {
  font-size: 0.94rem;
  color: var(--dark-walnut);
  margin-bottom: 0;
}

/* 优势与对比 BENEFITS */
.benefits-box {
  background-color: var(--parchment-light);
  border: 3px solid var(--dark-walnut);
  box-shadow: 6px 6px 0px var(--saddle-brown);
  padding: 24px;
}

.benefits-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 520px;
}

.comparison-table th, .comparison-table td {
  padding: 14px 16px;
  border: 1.5px solid var(--saddle-brown);
  font-size: 0.95rem;
}

.comparison-table th {
  font-family: var(--font-slab);
  background-color: var(--dark-walnut);
  color: var(--parchment-light);
  font-weight: 800;
}

.comparison-table .highlight-col {
  color: var(--dark-walnut);
  font-weight: 700;
  background-color: rgba(167, 67, 46, 0.1);
}

.comparison-table th.highlight-col {
  background-color: var(--rust-red);
  color: var(--parchment-light);
}

/* ==========================================================================
   定价卡 PRICING：拓荒装备等级 (探路者 / 先锋官 / 传奇领航)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--parchment-light);
  border: 2px solid var(--dark-walnut);
  outline: 1px solid var(--saddle-brown);
  outline-offset: -6px;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: 5px 5px 0px var(--dusty-sand);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 7px 7px 0px var(--saddle-brown);
}

.pricing-card.is-featured {
  border: 3px solid var(--dark-walnut);
  background-color: #FFFDF7;
  box-shadow: 8px 8px 0px var(--rust-red);
}

/* 角落印章轻微旋转 (Stamp Badge) */
.featured-ribbon {
  position: absolute;
  top: -14px;
  right: 18px;
  background-color: var(--rust-red);
  color: var(--parchment-light);
  font-family: var(--font-slab);
  font-size: 0.82rem;
  font-weight: 900;
  padding: 4px 12px;
  border: 2px solid var(--dark-walnut);
  box-shadow: 3px 3px 0px var(--dark-walnut);
  transform: rotate(3deg);
  transition: transform 0.2s ease;
}

.pricing-card.is-featured:hover .featured-ribbon {
  transform: rotate(-3deg) scale(1.06);
}

.tier-badge-sub {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--rust-red);
  margin-bottom: 4px;
  display: block;
}

.tier-name {
  font-size: 1.4rem;
  margin-bottom: 6px;
}

.tier-audience {
  font-size: 0.88rem;
  color: var(--saddle-brown);
  margin-bottom: 16px;
}

.tier-price-box {
  display: flex;
  align-items: baseline;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px dashed var(--saddle-brown);
}

.price-currency {
  font-family: var(--font-slab);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--dark-walnut);
}

.price-num {
  font-family: var(--font-slab);
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--rust-red);
  line-height: 1;
}

.price-period {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--saddle-brown);
  margin-left: 6px;
}

.tier-features {
  list-style: none;
  padding-left: 0;
  margin-bottom: 26px;
  flex-grow: 1;
}

.tier-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.94rem;
  margin-bottom: 11px;
  color: var(--dark-walnut);
}

.tier-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--rust-red);
  flex-shrink: 0;
  margin-top: 3px;
}

/* ==========================================================================
   使用场景卡 SCENARIOS
   ========================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.scenario-title {
  font-size: 1.22rem;
  margin-bottom: 8px;
}

.scenario-device {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--parchment-light);
  background-color: var(--saddle-brown);
  border: 1px solid var(--dark-walnut);
  display: inline-block;
  padding: 2px 10px;
  margin-bottom: 14px;
}

.scenario-desc {
  font-size: 0.94rem;
  color: var(--dark-walnut);
  margin-bottom: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--saddle-brown);
}

/* ==========================================================================
   常见问题 FAQ 手风琴
   ========================================================================== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background-color: var(--parchment-light);
  border: 2px solid var(--dark-walnut);
  box-shadow: 4px 4px 0px var(--dusty-sand);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 18px 22px;
  background: transparent;
  border: none;
  font-family: var(--font-slab);
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--dark-walnut);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-question:focus-visible {
  outline: 2px dashed var(--rust-red);
  outline-offset: -2px;
}

.faq-icon {
  width: 22px;
  height: 22px;
  color: var(--rust-red);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease-out;
  padding: 0 22px;
}

.faq-item.is-open .faq-answer {
  padding-bottom: 18px;
  border-top: 1px dashed var(--saddle-brown);
  padding-top: 14px;
}

.faq-answer p {
  margin-bottom: 0;
  font-size: 0.96rem;
  color: var(--dark-walnut);
  line-height: 1.68;
}

/* ==========================================================================
   倒数第二模块 FINAL CTA：海报号召
   ========================================================================== */
.final-cta-section {
  padding: 64px 0;
  background-color: var(--parchment);
  border-bottom: 3px double var(--dark-walnut);
  text-align: center;
}

.final-cta-box {
  max-width: 720px;
  margin: 0 auto;
  background-color: var(--parchment-light);
  border: 3px solid var(--dark-walnut);
  outline: 1.5px dashed var(--saddle-brown);
  outline-offset: -8px;
  padding: 40px 28px;
  box-shadow: 8px 8px 0px var(--saddle-brown);
}

.final-cta-title {
  font-size: 2rem;
  margin-bottom: 14px;
}

.final-cta-desc {
  font-size: 1.06rem;
  color: var(--saddle-brown);
  margin-bottom: 26px;
}

/* ==========================================================================
   页脚 FOOTER
   ========================================================================== */
.site-footer {
  background-color: var(--dark-walnut);
  color: var(--parchment);
  padding: 44px 0 28px;
  font-size: 0.9rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 22px;
  margin-bottom: 20px;
  padding-left: 0;
  list-style: none;
}

.footer-nav a {
  color: var(--parchment-light);
  background-image: linear-gradient(var(--dusty-sand), var(--dusty-sand));
}

.footer-nav a:hover {
  color: var(--dusty-sand);
}

.footer-affiliate-note {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 16px;
  font-size: 0.84rem;
  color: var(--dusty-sand);
}

.footer-copyright {
  text-align: center;
  border-top: 1px dashed var(--saddle-brown);
  padding-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--dusty-sand);
}

/* 移动端吸底 CTA */
.sticky-cta-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 99;
  background-color: var(--parchment-light);
  border-top: 3px solid var(--dark-walnut);
  padding: 10px 16px;
  box-shadow: 0 -4px 12px rgba(51, 37, 29, 0.25);
}

.sticky-cta-bar.is-visible {
  display: block;
}

/* ==========================================================================
   指南页 TUTORIALS & 文章正文页面 ARTICLE
   ========================================================================== */
.page-header {
  padding: 40px 0 32px;
  background-color: var(--parchment-light);
  border-bottom: 3px double var(--dark-walnut);
  margin-bottom: 36px;
}

.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--saddle-brown);
  margin-bottom: 14px;
}

.breadcrumbs a {
  color: var(--rust-red);
}

.article-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 52px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--saddle-brown);
  margin-bottom: 10px;
}

.article-card-title {
  font-size: 1.25rem;
  margin-bottom: 10px;
  line-height: 1.4;
}

.article-card-title a {
  color: var(--dark-walnut);
}

.article-card-title a:hover {
  color: var(--rust-red);
}

.article-summary {
  font-size: 0.94rem;
  color: var(--dark-walnut);
  margin-bottom: 16px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1.5px dashed var(--saddle-brown);
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding: 24px 0 60px;
}

.article-main,
.legal-main {
  background-color: var(--parchment-light);
  border: 3px solid var(--dark-walnut);
  outline: 1px dashed var(--saddle-brown);
  outline-offset: -8px;
  padding: 32px 24px;
  box-shadow: 6px 6px 0px var(--dusty-sand);
}

.article-header,
.legal-header {
  border-bottom: 2px solid var(--dark-walnut);
  padding-bottom: 22px;
  margin-bottom: 28px;
}

.article-h1,
.legal-title {
  font-size: 1.85rem;
  margin-bottom: 14px;
  line-height: 1.32;
}

.article-info-bar,
.legal-updated {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--saddle-brown);
}

.article-lead {
  font-size: 1.04rem;
  color: var(--dark-walnut);
  background-color: var(--parchment);
  border: 1.5px solid var(--saddle-brown);
  border-left: 5px solid var(--rust-red);
  padding: 16px 20px;
  margin-bottom: 28px;
}

.article-body h2,
.legal-content h2 {
  font-size: 1.42rem;
  margin-top: 36px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 2px dashed var(--saddle-brown);
}

.article-body h3 {
  font-size: 1.18rem;
  margin-top: 24px;
  margin-bottom: 10px;
}

.article-callout {
  background-color: var(--parchment);
  border: 2px solid var(--dark-walnut);
  box-shadow: 4px 4px 0px var(--rust-red);
  padding: 18px 20px;
  margin: 24px 0;
}

.article-callout-title {
  font-family: var(--font-slab);
  font-weight: 800;
  color: var(--rust-red);
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.article-cta-box {
  background-color: var(--parchment);
  border: 2px solid var(--dark-walnut);
  padding: 28px 24px;
  margin: 36px 0;
  text-align: center;
  box-shadow: 5px 5px 0px var(--saddle-brown);
}

.article-cta-title {
  font-size: 1.3rem;
  margin-bottom: 10px;
}

.article-cta-desc {
  font-size: 0.96rem;
  color: var(--saddle-brown);
  margin-bottom: 18px;
}

.related-articles {
  margin-top: 36px;
  border-top: 2px solid var(--dark-walnut);
  padding-top: 24px;
}

.related-title {
  font-size: 1.2rem;
  margin-bottom: 14px;
}

.related-list {
  list-style: square;
  padding-left: 20px;
}

/* ==========================================================================
   响应式 BREAKPOINTS (移动端纹理降低、文字清晰易读)
   ========================================================================== */
@media (max-width: 767px) {
  body {
    background-image: none;
  }
  .hero-poster-frame {
    padding: 24px 16px;
    box-shadow: 4px 4px 0px var(--dusty-sand);
  }
  .featured-ribbon {
    transform: none;
  }
}

@media (min-width: 640px) {
  .hero-cta-group {
    flex-direction: row;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .scenarios-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 768px) {
  .site-nav {
    display: block;
  }
  .header-cta {
    display: inline-flex;
  }
  .mobile-toggle {
    display: none;
  }
  .hero-title {
    font-size: 2.95rem;
  }
  .hero-subtitle {
    font-size: 1.16rem;
  }
  .platforms-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-main,
  .legal-main {
    padding: 44px 40px;
  }
  .sticky-cta-bar {
    display: none !important;
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .article-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 无障碍减少动画支持 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}