/* ==========================================================================
   草莓牛奶邮局 (Strawberry Milk Post Office) · FlyBit 品牌设计系统
   Palette:
   - 奶粉背景: #FFF3F5
   - 草莓粉: #F1BDCB
   - 淡紫: #DED3EE
   - 奶油黄: #F8E8B6
   - 正文: #51434E
   - 深草莓莓果色 (对比度强调): #A84860 / #883247
   - 纯净信纸白: #FFFFFF
   - 虚线与印戳淡紫: #C4B5DC
   ========================================================================== */

:root {
  --bg-milky: #FFF3F5;
  --strawberry-pink: #F1BDCB;
  --strawberry-light: #FDEEF2;
  --strawberry-deep: #A84860;
  --strawberry-dark: #7B2F42;
  --lavender: #DED3EE;
  --lavender-light: #F4F0FA;
  --lavender-dark: #6C548F;
  --cream-yellow: #F8E8B6;
  --cream-light: #FFF9E6;
  --cream-dark: #8E7A3A;
  --text-main: #51434E;
  --text-muted: #7E6C7A;
  --text-light: #9F8D9B;
  --white: #FFFFFF;
  --stamp-border: #E8CCD5;
  --shadow-soft: 0 8px 24px rgba(168, 72, 96, 0.08);
  --shadow-hover: 0 14px 32px rgba(168, 72, 96, 0.14);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-stamp: 4px;
  --font-heading: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", Consolas, "Courier New", monospace;
  --transition: all 0.25s ease-in-out;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-milky);
  color: var(--text-main);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  line-height: 1.68;
  color: var(--text-main);
  background-color: var(--bg-milky);
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(241, 189, 203, 0.25) 0%, transparent 20%),
    radial-gradient(circle at 90% 80%, rgba(222, 211, 238, 0.3) 0%, transparent 25%),
    radial-gradient(circle at 50% 50%, rgba(248, 232, 182, 0.2) 0%, transparent 30%);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 编号与等宽技术参数 */
.font-mono,
.rate-code,
.stamp-no,
.postal-id,
code, kbd {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* 标题规范：加粗、字距略紧 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--strawberry-dark);
  line-height: 1.3;
}

a {
  color: var(--strawberry-deep);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--strawberry-dark);
}

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

/* 容器与版心 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ==========================================================================
   特色视觉元素：邮票齿孔、信封折角、邮戳、弧形投递线
   ========================================================================== */

/* 1. 邮票边框与齿孔 */
.stamp-card {
  position: relative;
  background: var(--white);
  border: 2px dashed var(--stamp-border);
  border-radius: var(--radius-sm);
  padding: 24px;
  box-shadow: var(--shadow-soft);
  transition: var(--transition);
}

.stamp-card::before,
.stamp-card::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  background-color: var(--bg-milky);
  border-radius: 50%;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
}

.stamp-card::before { left: -9px; }
.stamp-card::after { right: -9px; }

/* 2. 信封折角样式 */
.envelope-folded {
  position: relative;
  background: var(--white);
  border-radius: var(--radius-md);
  border: 1px solid rgba(241, 189, 203, 0.4);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.envelope-folded::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 42px 42px 0;
  border-color: transparent var(--strawberry-pink) transparent transparent;
  filter: drop-shadow(-2px 2px 2px rgba(168, 72, 96, 0.15));
}

/* 3. 复古双环邮戳 */
.postmark-badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 96px;
  height: 96px;
  border: 2.5px solid var(--strawberry-deep);
  border-radius: 50%;
  padding: 4px;
  text-align: center;
  position: relative;
  color: var(--strawberry-deep);
  user-select: none;
  transform: rotate(-8deg);
  background: rgba(255, 255, 255, 0.65);
  box-shadow: 0 0 0 3px rgba(241, 189, 203, 0.4);
}

.postmark-badge::before {
  content: "";
  position: absolute;
  inset: 3px;
  border: 1px dashed var(--strawberry-deep);
  border-radius: 50%;
}

.postmark-badge .pm-city {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  z-index: 1;
}

.postmark-badge .pm-date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  border-top: 1px solid var(--strawberry-deep);
  border-bottom: 1px solid var(--strawberry-deep);
  padding: 1px 0;
  margin: 2px 0;
  width: 80%;
  z-index: 1;
}

.postmark-badge .pm-status {
  font-size: 0.65rem;
  font-weight: 700;
  z-index: 1;
}

/* 邮戳波浪线 */
.postmark-waves {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  vertical-align: middle;
  margin-left: 6px;
}

.postmark-waves span {
  display: block;
  width: 32px;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--strawberry-deep) 0, var(--strawberry-deep) 4px, transparent 4px, transparent 8px);
}

/* ==========================================================================
   Header & 信封标签导航 (Envelope Tab Navigation)
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 243, 245, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--strawberry-pink);
  padding: 10px 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-stamp {
  width: 44px;
  height: 44px;
  background: var(--strawberry-pink);
  border: 2px dashed var(--strawberry-deep);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--strawberry-dark);
  box-shadow: 0 2px 8px rgba(168, 72, 96, 0.15);
  flex-shrink: 0;
}

.logo-stamp svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}

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

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--strawberry-dark);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.brand-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* 信封标签导航 */
.envelope-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  flex-wrap: nowrap;
}

.nav-tab-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  white-space: nowrap; /* 核心修复：坚决杜绝换行坍塌成单字 */
  padding: 6px 10px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--stamp-border);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  transition: var(--transition);
}

.nav-tab-link::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 3px;
  background: var(--strawberry-pink);
  border-radius: 2px;
  opacity: 0;
  transition: var(--transition);
}

.nav-tab-link:hover,
.nav-tab-link.active {
  background: var(--white);
  color: var(--strawberry-dark);
  transform: translateY(-2px);
  box-shadow: 0 -4px 10px rgba(168, 72, 96, 0.08);
  border-color: var(--strawberry-pink);
}

.nav-tab-link:hover::before,
.nav-tab-link.active::before {
  opacity: 1;
}

.header-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap; /* 核心修复：防止商推按钮被挤压换行 */
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 700;
  flex-shrink: 0;
  color: var(--white);
  background: linear-gradient(135deg, var(--strawberry-deep) 0%, var(--strawberry-dark) 100%);
  border: 1px solid var(--strawberry-dark);
  border-radius: 22px;
  box-shadow: 0 4px 12px rgba(168, 72, 96, 0.25);
  cursor: pointer;
  transition: var(--transition);
}

.header-cta-btn:hover {
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(168, 72, 96, 0.35);
}

/* 移动端汉堡按钮 */
.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--strawberry-pink);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  color: var(--strawberry-dark);
}

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

/* ==========================================================================
   Hero 首屏 & 互动邮局柜台 (Post Office Counter)
   ========================================================================== */

.hero-section {
  padding: 48px 0 36px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--cream-yellow);
  color: var(--cream-dark);
  border: 1px dashed var(--cream-dark);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--strawberry-dark);
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

.hero-title .highlight {
  position: relative;
  display: inline-block;
  color: var(--strawberry-deep);
}

.hero-title .highlight::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 4px;
  width: 100%;
  height: 10px;
  background: var(--strawberry-pink);
  opacity: 0.45;
  border-radius: 4px;
  z-index: -1;
}

.hero-intro {
  max-width: 760px;
  margin: 0 auto 36px;
  font-size: 1.12rem;
  color: var(--text-main);
  line-height: 1.75;
}

/* 互动邮局柜台 (横跨内容宽度) */
.postal-counter {
  background: var(--white);
  border: 3px solid var(--strawberry-pink);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: 0 16px 40px rgba(168, 72, 96, 0.12);
  position: relative;
  text-align: left;
}

.postal-counter::before {
  content: "POSTAL DESK NO.01 · 草莓牛奶专线窗口";
  position: absolute;
  top: -14px;
  left: 28px;
  background: var(--strawberry-deep);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 14px;
  border-radius: 12px;
  letter-spacing: 0.05em;
}

.counter-grid {
  display: grid;
  grid-template-columns: 1.4fr 1.6fr;
  gap: 28px;
  align-items: center;
}

.counter-weighing {
  background: var(--strawberry-light);
  border: 1px dashed var(--strawberry-pink);
  border-radius: var(--radius-md);
  padding: 22px;
}

.weighing-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.weighing-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--strawberry-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}

.weighing-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.slider-group label {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}

.slider-group input[type="range"] {
  width: 100%;
  accent-color: var(--strawberry-deep);
  height: 6px;
  background: var(--white);
  border-radius: 4px;
  cursor: pointer;
}

.stamp-result-box {
  margin-top: 14px;
  padding: 12px 16px;
  background: var(--white);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--strawberry-deep);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stamp-result-text .plan-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--strawberry-dark);
}

.stamp-result-text .plan-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.stamp-result-price {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--strawberry-deep);
}

/* 柜台右侧：投递看板与快速口 */
.counter-dispatch {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.dispatch-status-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.status-mini-card {
  background: var(--lavender-light);
  border: 1px solid var(--lavender);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
}

.status-mini-card .val {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--lavender-dark);
}

.status-mini-card .lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.counter-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--cream-light);
  border: 1px solid var(--cream-yellow);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.counter-bell-btn {
  background: var(--cream-yellow);
  border: 2px solid var(--cream-dark);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(142, 122, 58, 0.2);
  transition: transform 0.15s ease;
  flex-shrink: 0;
}

.counter-bell-btn:active {
  transform: scale(0.92);
}

.counter-bell-btn svg {
  width: 24px;
  height: 24px;
  fill: var(--cream-dark);
}

.counter-action-text {
  flex-grow: 1;
}

.counter-action-text h4 {
  font-size: 0.96rem;
  color: var(--cream-dark);
  margin-bottom: 2px;
}

.counter-action-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.counter-cta-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: var(--strawberry-deep);
  color: var(--white);
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: 20px;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(168, 72, 96, 0.25);
}

.counter-cta-link:hover {
  background: var(--strawberry-dark);
  color: var(--white);
  transform: translateY(-2px);
}

/* ==========================================================================
   Section 通用标题
   ========================================================================== */

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  background: var(--lavender-light);
  border: 1px solid var(--lavender);
  border-radius: 16px;
  color: var(--lavender-dark);
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--strawberry-dark);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   产品优势：三封展开的信件 (Three Unfolded Letters)
   ========================================================================== */

.section-advantages {
  padding: 72px 0;
}

.letters-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.unfolded-letter {
  position: relative;
  background: var(--white);
  border-radius: var(--radius-md);
  border: 2px solid var(--strawberry-pink);
  padding: 36px 26px 28px;
  box-shadow: var(--shadow-soft);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.unfolded-letter:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--strawberry-deep);
}

/* 信件顶部的三角折盖展开效果 */
.unfolded-letter::before {
  content: "";
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 28px solid transparent;
  border-right: 28px solid transparent;
  border-bottom: 16px solid var(--strawberry-pink);
}

.letter-stamp-corner {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 48px;
  height: 58px;
  background: var(--lavender-light);
  border: 2px dashed var(--lavender-dark);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  color: var(--lavender-dark);
  font-weight: 700;
  text-align: center;
  padding: 2px;
}

.letter-stamp-corner svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
  margin-bottom: 2px;
}

.letter-no {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--strawberry-deep);
  margin-bottom: 10px;
  display: inline-block;
  background: var(--strawberry-light);
  padding: 2px 8px;
  border-radius: 4px;
}

.letter-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--strawberry-dark);
  margin-bottom: 14px;
  line-height: 1.3;
}

.letter-body {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: 20px;
}

.letter-footer-meta {
  padding-top: 14px;
  border-top: 1px dashed var(--stamp-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.letter-signature {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--strawberry-dark);
}

/* ==========================================================================
   节点覆盖：邮政路线图 (Postal Route Map)
   ========================================================================== */

.section-network {
  padding: 72px 0;
  background: rgba(255, 255, 255, 0.4);
}

.postal-map-container {
  background: var(--white);
  border: 2px solid var(--stamp-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
}

/* 弧形投递路线 SVG 装饰 */
.route-svg-canvas {
  width: 100%;
  height: 180px;
  margin-bottom: 24px;
}

.route-nodes-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
}

.route-nodes-table th,
.route-nodes-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--bg-milky);
  font-size: 0.92rem;
}

.route-nodes-table th {
  background: var(--lavender-light);
  color: var(--lavender-dark);
  font-weight: 700;
}

.route-nodes-table tr:hover td {
  background: var(--strawberry-light);
}

.badge-status-online {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #2F7B4C;
  font-weight: 600;
  font-size: 0.85rem;
}

.badge-status-online::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2ECC71;
  box-shadow: 0 0 6px rgba(46, 204, 113, 0.6);
}

.node-flag {
  font-size: 1.2rem;
  margin-right: 6px;
  vertical-align: middle;
}

/* ==========================================================================
   AI 与流媒体：工作邮袋与娱乐邮袋 (Work & Entertainment Mailbags)
   ========================================================================== */

.section-mailbags {
  padding: 72px 0;
}

.mailbags-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.mailbag-card {
  position: relative;
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.mailbag-work {
  background: linear-gradient(180deg, #FFFFFF 0%, var(--lavender-light) 100%);
  border: 2px solid var(--lavender);
}

.mailbag-entertainment {
  background: linear-gradient(180deg, #FFFFFF 0%, var(--strawberry-light) 100%);
  border: 2px solid var(--strawberry-pink);
}

.mailbag-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}

.mailbag-icon-badge {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.mailbag-work .mailbag-icon-badge {
  background: var(--lavender);
  color: var(--lavender-dark);
}

.mailbag-entertainment .mailbag-icon-badge {
  background: var(--strawberry-pink);
  color: var(--strawberry-dark);
}

.mailbag-icon-badge svg {
  width: 32px;
  height: 32px;
  fill: currentColor;
}

.mailbag-title {
  font-size: 1.45rem;
  font-weight: 800;
}

.mailbag-badge-tag {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 12px;
  display: inline-block;
  margin-top: 4px;
}

.mailbag-work .mailbag-badge-tag {
  background: var(--lavender-dark);
  color: var(--white);
}

.mailbag-entertainment .mailbag-badge-tag {
  background: var(--strawberry-deep);
  color: var(--white);
}

.mailbag-items {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mailbag-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: rgba(255, 255, 255, 0.85);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--stamp-border);
}

.item-bullet {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--strawberry-deep);
}

.item-content h4 {
  font-size: 0.98rem;
  margin-bottom: 3px;
  color: var(--text-main);
}

.item-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   五档套餐：纵向邮资表 (Vertical Postal Tariff Table)
   ========================================================================== */

.section-pricing {
  padding: 72px 0;
  background: rgba(255, 255, 255, 0.45);
}

.tariff-board {
  background: var(--white);
  border: 3px solid var(--strawberry-pink);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-hover);
  position: relative;
}

.tariff-board-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px dashed var(--stamp-border);
  padding-bottom: 18px;
  margin-bottom: 24px;
}

.tariff-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--strawberry-dark);
}

.tariff-stamp-seal {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--strawberry-deep);
  border: 1px solid var(--strawberry-pink);
  padding: 4px 12px;
  border-radius: 4px;
  background: var(--strawberry-light);
}

.tariff-cards-vertical {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.tariff-row {
  position: relative;
  background: var(--bg-milky);
  border: 1.5px solid var(--stamp-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
}

.tariff-row:hover {
  background: var(--white);
  border-color: var(--strawberry-pink);
  box-shadow: 0 6px 18px rgba(168, 72, 96, 0.1);
  transform: translateX(4px);
}

/* 推荐套餐特殊突出与加盖邮戳 */
.tariff-row.recommended {
  background: linear-gradient(90deg, #FFFFFF 0%, var(--strawberry-light) 100%);
  border: 2px solid var(--strawberry-deep);
  box-shadow: 0 8px 24px rgba(168, 72, 96, 0.16);
}

.tariff-name-wrap {
  display: flex;
  align-items: center;
  gap: 14px;
}

.tariff-row.recommended .postmark-badge {
  position: static;
  width: 76px;
  height: 76px;
  transform: rotate(-7deg);
  flex-shrink: 0;
  box-shadow: 0 0 0 2px rgba(241, 189, 203, 0.4);
}

.recommend-pill {
  font-size: 0.72rem;
  background: var(--strawberry-deep);
  color: #fff;
  padding: 2px 7px;
  border-radius: 4px;
  margin-left: 6px;
  vertical-align: middle;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tariff-col-name h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--strawberry-dark);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tariff-col-name p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.tariff-col-traffic {
  font-family: var(--font-mono);
}

.tariff-col-traffic .traffic-amount {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--strawberry-dark);
}

.tariff-col-traffic .traffic-cycle {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: block;
}

.tariff-col-specs {
  font-size: 0.85rem;
  color: var(--text-main);
  line-height: 1.5;
}

.tariff-col-price {
  font-family: var(--font-mono);
  text-align: right;
}

.tariff-col-price .price-val {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--strawberry-deep);
}

.tariff-col-price .price-unit {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.tariff-col-action {
  text-align: right;
}

.tariff-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 0.92rem;
  font-weight: 700;
  background: var(--strawberry-pink);
  color: var(--strawberry-dark);
  border: 1px solid var(--strawberry-deep);
  transition: var(--transition);
}

.tariff-btn:hover {
  background: var(--strawberry-deep);
  color: var(--white);
  box-shadow: 0 4px 12px rgba(168, 72, 96, 0.25);
}

.tariff-row.recommended .tariff-btn {
  background: var(--strawberry-deep);
  color: var(--white);
  border-color: var(--strawberry-dark);
}

.tariff-row.recommended .tariff-btn:hover {
  background: var(--strawberry-dark);
}

/* ==========================================================================
   杂志式两列文章排版 (Magazine 2-Column Articles Layout)
   ========================================================================== */

.section-articles {
  padding: 72px 0;
}

.magazine-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

/* 第一篇文章加大跨两列 */
.article-card-featured {
  grid-column: 1 / -1;
  background: var(--white);
  border: 2px solid var(--strawberry-pink);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-soft);
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 32px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.article-card-featured::before {
  content: "FEATURED · 邮局特刊";
  position: absolute;
  top: 16px;
  left: 20px;
  background: var(--cream-yellow);
  color: var(--cream-dark);
  border: 1px solid var(--cream-dark);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 4px;
}

.featured-cover-box {
  background: linear-gradient(135deg, var(--strawberry-light) 0%, var(--lavender-light) 100%);
  border: 2px dashed var(--stamp-border);
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
  position: relative;
}

.featured-cover-box .cover-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 16px;
  color: var(--strawberry-deep);
}

.featured-content .art-category {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--strawberry-deep);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  display: inline-block;
}

.featured-content .art-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--strawberry-dark);
  line-height: 1.35;
  margin-bottom: 14px;
}

.featured-content .art-title a:hover {
  color: var(--strawberry-deep);
}

.featured-content .art-excerpt {
  font-size: 0.96rem;
  color: var(--text-main);
  line-height: 1.7;
  margin-bottom: 20px;
}

.art-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 普通杂志单篇 */
.article-card {
  background: var(--white);
  border: 1px solid var(--stamp-border);
  border-radius: var(--radius-md);
  padding: 26px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--strawberry-pink);
  box-shadow: var(--shadow-hover);
}

.article-card .art-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.article-card .art-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--strawberry-deep);
  background: var(--strawberry-light);
  padding: 3px 8px;
  border-radius: 4px;
}

.article-card .art-readtime {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.article-card .art-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--strawberry-dark);
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-card .art-title a {
  color: inherit;
}

.article-card .art-title a:hover {
  color: var(--strawberry-deep);
}

.article-card .art-excerpt {
  font-size: 0.9rem;
  color: var(--text-main);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-card .art-footer {
  border-top: 1px dashed var(--bg-milky);
  padding-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
}

.read-more-link {
  font-weight: 700;
  color: var(--strawberry-deep);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.read-more-link:hover {
  color: var(--strawberry-dark);
  transform: translateX(3px);
}

/* ==========================================================================
   评价：明信片设计 (Postcard Reviews)
   ========================================================================== */

.section-reviews {
  padding: 72px 0;
  background: rgba(255, 255, 255, 0.4);
}

.postcards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.postcard-card {
  background: #FFFDF9;
  border: 1px solid #E6D8D0;
  border-radius: var(--radius-sm);
  padding: 24px;
  box-shadow: var(--shadow-soft);
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

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

.postcard-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 18px;
  border-bottom: 1px dashed #E6D8D0;
  padding-bottom: 14px;
}

.postcard-sender {
  font-size: 0.85rem;
}

.postcard-sender .sender-name {
  font-weight: 700;
  color: var(--strawberry-dark);
  display: block;
}

.postcard-sender .sender-tag {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.postcard-stamp {
  width: 44px;
  height: 52px;
  background: var(--strawberry-light);
  border: 1.5px dashed var(--strawberry-deep);
  border-radius: 3px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  color: var(--strawberry-dark);
  font-weight: 700;
  transform: rotate(4deg);
}

.postcard-stamp svg {
  width: 20px;
  height: 20px;
  fill: var(--strawberry-deep);
  margin-bottom: 2px;
}

.postcard-message {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-main);
  flex-grow: 1;
  margin-bottom: 16px;
  font-style: italic;
  position: relative;
}

.postcard-message::before {
  content: "“";
  font-family: Georgia, serif;
  font-size: 2rem;
  color: var(--strawberry-pink);
  position: absolute;
  left: -12px;
  top: -14px;
  opacity: 0.6;
}

.postcard-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  padding-top: 10px;
}

.postcard-badge-demo {
  background: var(--cream-yellow);
  color: var(--cream-dark);
  padding: 1px 6px;
  border-radius: 3px;
  font-weight: 600;
}

/* ==========================================================================
   FAQ：逐封打开的信封 (Opening Envelope Accordions)
   ========================================================================== */

.section-faq {
  padding: 72px 0;
}

.faq-envelope-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.faq-envelope {
  background: var(--white);
  border: 2px solid var(--stamp-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition: var(--transition);
}

.faq-envelope:hover {
  border-color: var(--strawberry-pink);
}

.faq-envelope.open {
  border-color: var(--strawberry-deep);
  box-shadow: var(--shadow-hover);
}

.faq-envelope-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  gap: 16px;
  color: var(--strawberry-dark);
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
}

.faq-envelope-btn .envelope-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  fill: var(--strawberry-deep);
  transition: transform 0.3s ease;
}

.faq-envelope.open .faq-envelope-btn .envelope-icon {
  transform: rotate(180deg);
}

.faq-letter-paper {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  background: var(--strawberry-light);
  border-top: 1px dashed transparent;
  padding: 0 24px;
}

.faq-envelope.open .faq-letter-paper {
  max-height: 600px;
  padding: 20px 24px 24px;
  border-top-color: var(--stamp-border);
}

.faq-letter-paper p {
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--text-main);
  margin-bottom: 10px;
}

.faq-letter-paper p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Footer 邮政总局页脚
   ========================================================================== */

.site-footer {
  background: var(--white);
  border-top: 3px dashed var(--strawberry-pink);
  padding: 60px 0 30px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 36px;
  margin-bottom: 48px;
}

.footer-brand-col .brand-title {
  font-size: 1.35rem;
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 18px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--strawberry-dark);
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
}

.footer-col-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 24px;
  height: 2px;
  background: var(--strawberry-deep);
}

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

.footer-nav-list a {
  color: var(--text-main);
  font-size: 0.88rem;
  transition: var(--transition);
}

.footer-nav-list a:hover {
  color: var(--strawberry-deep);
  transform: translateX(3px);
}

.footer-bottom-bar {
  border-top: 1px solid var(--stamp-border);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-partner-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-partner-links a {
  color: var(--text-muted);
}

.footer-partner-links a:hover {
  color: var(--strawberry-deep);
}

/* ==========================================================================
   单篇独立文章模板专用样式 (Article Detail Page Specifics)
   ========================================================================== */

.article-hero {
  padding: 40px 0 28px;
  background: linear-gradient(180deg, rgba(241, 189, 203, 0.25) 0%, transparent 100%);
  border-bottom: 1px dashed var(--stamp-border);
  margin-bottom: 40px;
}

.article-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.article-breadcrumbs a {
  color: var(--text-muted);
}

.article-breadcrumbs a:hover {
  color: var(--strawberry-deep);
}

.article-page-title {
  font-size: 2.35rem;
  line-height: 1.3;
  color: var(--strawberry-dark);
  margin-bottom: 16px;
}

.article-post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-container-layout {
  display: grid;
  grid-template-columns: 2.8fr 1.2fr;
  gap: 40px;
  align-items: flex-start;
}

.article-body-content {
  background: var(--white);
  border: 1px solid var(--stamp-border);
  border-radius: var(--radius-md);
  padding: 40px;
  box-shadow: var(--shadow-soft);
  font-size: 1.02rem;
  line-height: 1.85;
}

.article-body-content h2 {
  font-size: 1.6rem;
  color: var(--strawberry-dark);
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--strawberry-light);
}

.article-body-content h3 {
  font-size: 1.3rem;
  color: var(--strawberry-deep);
  margin: 24px 0 12px;
}

.article-body-content p {
  margin-bottom: 20px;
}

.article-body-content ul,
.article-body-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body-content li {
  margin-bottom: 8px;
}

.article-callout {
  background: var(--strawberry-light);
  border-left: 4px solid var(--strawberry-deep);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 18px 22px;
  margin: 24px 0;
}

.article-callout h4 {
  font-size: 1rem;
  color: var(--strawberry-dark);
  margin-bottom: 6px;
}

.article-callout p {
  margin-bottom: 0;
  font-size: 0.92rem;
}

.article-sidebar {
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  background: var(--white);
  border: 1px solid var(--stamp-border);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow-soft);
}

.sidebar-widget h4 {
  font-size: 1.05rem;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--stamp-border);
}

/* ==========================================================================
   响应式断点 (375px - 1440px)
   ========================================================================== */

/* 1120px 以下：信封导航折叠为移动端汉堡抽屉，防止9个标签横向挤压变形 */
@media (max-width: 1120px) {
  .envelope-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--white);
    flex-direction: column;
    padding: 16px 20px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
    border-bottom: 2px solid var(--strawberry-pink);
    gap: 8px;
  }
  .envelope-nav.open {
    display: flex;
  }
  .nav-tab-link {
    width: 100%;
    border-radius: 6px;
    border-bottom: 1px solid var(--stamp-border);
    padding: 10px 14px;
  }
  .mobile-menu-toggle {
    display: block;
  }
}

@media (max-width: 1024px) {
  .counter-grid {
    grid-template-columns: 1fr;
  }
  .letters-grid {
    grid-template-columns: 1fr;
  }
  .mailbags-wrapper {
    grid-template-columns: 1fr;
  }
  .magazine-grid {
    grid-template-columns: 1fr;
  }
  .article-card-featured {
    grid-template-columns: 1fr;
  }
  .postcards-grid {
    grid-template-columns: 1fr;
  }
  .tariff-row {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .tariff-col-name {
    grid-column: 1 / -1;
  }
  .tariff-row.recommended .postmark-badge {
    position: static;
    transform: rotate(-5deg);
    margin: 0;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .article-container-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }
  .hero-intro {
    font-size: 0.98rem;
  }
  .tariff-row {
    grid-template-columns: 1fr;
    text-align: left;
  }
  .tariff-col-name {
    grid-column: auto;
  }
  .tariff-col-price,
  .tariff-col-action {
    text-align: left;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .dispatch-status-cards {
    grid-template-columns: 1fr;
  }
  .footer-bottom-bar {
    flex-direction: column;
    text-align: center;
  }
  .footer-partner-links {
    flex-direction: column;
    gap: 8px;
  }
  .article-body-content {
    padding: 24px 18px;
  }
  .article-page-title {
    font-size: 1.7rem;
  }
}