/* ==================================================
   网际快车云 (WangJiKuaiCloud) - 编组穿梭系统 样式表
   ================================================== */

:root {
  --bg: #F7F6F2;
  --surface: #FFFFFF;
  --text: #202A33;
  --body: #5C6670;
  --muted: #87919A;
  --navy-deep: #19364C;
  --navy: #2E526A;
  --steel: #5E7483;
  --steel-light: #788995;
  --signal: #A94A3A;
  --signal-deep: #82382D;
  --signal-soft: #F4E7E3;
  --brass: #B49358;
  --brass-deep: #907344;
  --brass-soft: #F3ECDD;
  --light-grey: #EFF0ED;
  --border: #D9DDDC;
  --border-deep: #C7CDCC;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --max-width: 1200px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  -webkit-text-size-adjust: 100%;
}

body {
  line-height: 1.8;
  background-color: var(--bg);
  color: var(--body);
  overflow-x: hidden;
}

a {
  color: var(--navy);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

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

:focus-visible {
  outline: 2px solid var(--navy-deep);
  outline-offset: 3px;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }

p {
  margin-bottom: 1.25rem;
}

p:last-child {
  margin-bottom: 0;
}

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

/* Header */
.site-header {
  height: 72px;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

/* Brand Logo - WJKC Segmented Shuttle Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.logo-svg {
  width: 36px;
  height: 28px;
}

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

.brand-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--navy-deep);
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 500;
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 1.2rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  padding: 0.4rem 0;
  position: relative;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--navy-deep);
}

.nav-link.active {
  color: var(--navy-deep);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 16px;
  height: 2px;
  background-color: var(--signal);
}

/* Header CTA button */
.btn-cta-header {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  background-color: var(--navy-deep);
  color: var(--surface);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 4px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.btn-cta-header:hover {
  background-color: var(--navy);
  color: var(--surface);
  transform: translateY(-1px);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 4px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--navy-deep);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(32, 42, 51, 0.5);
  z-index: 999;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background-color: var(--surface);
  border-bottom: 2px solid var(--navy-deep);
  padding: 1.5rem;
  z-index: 1000;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
  max-height: calc(100vh - 72px);
  overflow-y: auto;
}

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

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mobile-nav-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  display: block;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--light-grey);
}

.mobile-cta-wrap {
  margin-top: 1.5rem;
}

.mobile-cta-btn {
  display: block;
  text-align: center;
  padding: 0.8rem;
  background-color: var(--navy-deep);
  color: #FFF;
  font-weight: 700;
  border-radius: 4px;
}

/* ==================================================
   编组穿梭系统 UI Core Components
   ================================================== */

.section-padding {
  padding-top: 4.5rem;
  padding-bottom: 4.5rem;
  border-bottom: 1px solid var(--border);
}

.section-header-block {
  margin-bottom: 2.5rem;
  position: relative;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--signal);
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.section-title {
  color: var(--navy-deep);
  margin-bottom: 0.75rem;
}

.section-lead {
  font-size: 1.1rem;
  color: var(--body);
  max-width: 820px;
  line-height: 1.8;
}

/* Hero Section: 多段编组 Hero */
.hero-section {
  padding-top: 3.5rem;
  padding-bottom: 4.5rem;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  min-height: 680px;
}

.hero-meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--steel-light);
  margin-bottom: 1rem;
  padding-bottom: 0.25rem;
  border-bottom: 2px solid var(--brass);
}

.hero-main-title {
  margin-bottom: 1rem;
  color: var(--navy-deep);
}

.hero-subhead {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--signal);
  margin-bottom: 1.25rem;
}

.hero-description {
  font-size: 1.125rem;
  line-height: 1.85;
  color: var(--body);
  max-width: 880px;
  margin-bottom: 2rem;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 3.5rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  background-color: var(--navy-deep);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 1.05rem;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background-color: var(--navy);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  background-color: var(--surface);
  color: var(--navy-deep);
  font-weight: 700;
  font-size: 1rem;
  border: 1px solid var(--border-deep);
  border-radius: 4px;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  border-color: var(--navy-deep);
  background-color: var(--light-grey);
}

.link-text-cta {
  font-weight: 700;
  color: var(--navy);
  font-size: 0.98rem;
  padding: 0.5rem 0.2rem;
}

.link-text-cta:hover {
  color: var(--signal);
  text-decoration: underline;
}

/* Staggered Horizontal Grouping Rows in Hero (多段编组) */
.hero-shuttle-group {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  width: 100%;
}

.shuttle-block {
  padding: 1.25rem 1.75rem;
  border-top: 1px solid var(--border-deep);
  border-bottom: 1px solid var(--border-deep);
  transition: transform 0.2s ease;
}

.shuttle-block:hover {
  transform: translateX(4px);
}

.shuttle-block-ai {
  width: 86%;
  margin-left: 0;
  background-color: rgba(94, 116, 131, 0.08); /* 浅钢蓝灰 */
  border-left: 4px solid var(--steel);
}

.shuttle-block-video {
  width: 68%;
  margin-left: 14%;
  background-color: var(--signal-soft); /* 浅信号红 */
  border-left: 4px solid var(--signal);
}

.shuttle-block-daily {
  width: 52%;
  margin-left: 4%;
  background-color: var(--surface); /* 白 */
  border-left: 4px solid var(--border-deep);
}

.shuttle-block-work {
  width: 78%;
  margin-left: 22%;
  background-color: var(--brass-soft); /* 浅黄铜 */
  border-left: 4px solid var(--brass);
}

.shuttle-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.shuttle-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--navy-deep);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.shuttle-tags {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: 0.02em;
}

.shuttle-desc {
  font-size: 0.95rem;
  color: var(--body);
  margin: 0;
}

/* Section 01: AI与开发编组 */
.ai-section-group {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.ai-main-group {
  background-color: var(--surface);
  border-top: 2px solid var(--navy-deep);
  border-bottom: 1px solid var(--border);
  padding: 2rem;
}

.ai-segment-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.ai-segment-item {
  padding-top: 1rem;
  border-top: 1px solid var(--light-grey);
}

.ai-segment-item:first-child {
  border-top: none;
  padding-top: 0;
}

.ai-tool-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy-deep);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.ai-tool-name .badge {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  background-color: var(--light-grey);
  color: var(--navy);
  font-weight: 600;
  border-radius: 2px;
}

/* Section 02: 视频与流媒体宽屏编组带 */
.video-strip-group {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.video-strip {
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--border-deep);
  border-bottom: 1px solid var(--border-deep);
  background-color: var(--surface);
}

.video-strip-yt {
  width: 96%;
  margin-left: 0;
  border-left: 4px solid var(--signal);
}

.video-strip-nf {
  width: 88%;
  margin-left: 6%;
  background-color: rgba(244, 231, 227, 0.5);
  border-left: 4px solid var(--navy);
}

.video-strip-sp {
  width: 80%;
  margin-left: 12%;
  background-color: var(--bg);
  border-left: 4px solid var(--brass);
}

/* Section 03: 日常使用 Section */
.daily-shuttle-box {
  width: 65%;
  background-color: var(--surface);
  border-top: 2px solid var(--steel);
  border-bottom: 1px solid var(--border);
  padding: 2rem;
  margin-left: 5%;
}

/* Section 04: 办公长编组 */
.work-long-group {
  width: 92%;
  margin-left: 3%;
  background-color: var(--surface);
  border-top: 3px solid var(--navy-deep);
  border-bottom: 1px solid var(--border);
  padding: 2.2rem;
  position: relative;
}

.device-index-markers {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--light-grey);
}

.device-marker {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--navy);
  padding: 0.2rem 0.6rem;
  background-color: var(--light-grey);
  border-radius: 3px;
}

/* Section 05: 场景→流量编组 */
.data-plan-group {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.data-plan-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.8rem;
  background-color: var(--surface);
  border-top: 1px solid var(--border-deep);
  border-bottom: 1px solid var(--border-deep);
}

.data-plan-item:nth-child(1) { width: 60%; margin-left: 0; }
.data-plan-item:nth-child(2) { width: 75%; margin-left: 8%; }
.data-plan-item:nth-child(3) { width: 90%; margin-left: 2%; }
.data-plan-item:nth-child(4) { width: 82%; margin-left: 12%; }

.data-plan-scenario {
  font-weight: 700;
  color: var(--navy-deep);
  font-size: 1.05rem;
}

.data-plan-line {
  flex-grow: 1;
  height: 1px;
  background-color: var(--border-deep);
  margin: 0 1.5rem;
  aria-hidden: true;
}

.data-plan-value {
  font-weight: 800;
  color: var(--signal);
  font-size: 1.15rem;
  white-space: nowrap;
}

/* Section 06: 地区编组目录 */
.region-dir-group {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.region-dir-item {
  padding: 1.4rem 1.8rem;
  background-color: var(--surface);
  border-left: 4px solid var(--steel);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.region-dir-item:nth-child(1) { width: 88%; margin-left: 0; }
.region-dir-item:nth-child(2) { width: 72%; margin-left: 10%; border-left-color: var(--navy); }
.region-dir-item:nth-child(3) { width: 80%; margin-left: 4%; border-left-color: var(--brass); }
.region-dir-item:nth-child(4) { width: 94%; margin-left: 2%; border-left-color: var(--signal); }

.region-name {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--navy-deep);
  margin-bottom: 0.4rem;
}

/* Section 07: 线路 HTML Table */
.line-table-wrapper {
  width: 100%;
  overflow-x: auto;
  margin-top: 1.5rem;
  background-color: var(--surface);
  border-top: 2px solid var(--navy-deep);
  border-bottom: 1px solid var(--border);
}

.line-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.line-table th, .line-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.line-table th {
  background-color: var(--light-grey);
  color: var(--navy-deep);
  font-weight: 700;
  white-space: nowrap;
}

.line-table tr:hover {
  background-color: rgba(247, 246, 242, 0.6);
}

.line-table td.type-cell {
  font-weight: 800;
  color: var(--navy-deep);
  white-space: nowrap;
}

/* Section 08: 编组价带 (Staggered Price Bars) */
.price-shuttle-group {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}

.price-bar {
  padding: 1.75rem 2.2rem;
  border-top: 1px solid var(--border-deep);
  border-bottom: 1px solid var(--border-deep);
  background-color: var(--surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  transition: transform 0.2s ease;
}

.price-bar:hover {
  transform: translateY(-2px);
}

.price-bar-light { width: 55%; margin-left: 0; }
.price-bar-daily { width: 68%; margin-left: 22%; }
.price-bar-heavy { width: 76%; margin-left: 0; }
.price-bar-yearly { width: 58%; margin-left: 32%; }

/* 主力方案 (Featured Main Plan) */
.price-bar-main {
  width: 90%;
  margin-left: 5%;
  background-color: var(--brass-soft); /* #F3ECDD */
  border-top: 3px solid var(--navy-deep);
  border-bottom: 2px solid var(--brass);
  position: relative;
}

.price-plan-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--navy-deep);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.price-plan-badge {
  font-size: 0.78rem;
  padding: 0.2rem 0.6rem;
  background-color: var(--signal);
  color: #FFF;
  font-weight: 700;
  border-radius: 2px;
}

.price-plan-data {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--steel);
  margin-top: 0.2rem;
}

.price-plan-fit {
  font-size: 0.9rem;
  color: var(--body);
  margin-top: 0.3rem;
}

.price-plan-cost {
  text-align: right;
  white-space: nowrap;
}

.price-amount {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--navy-deep);
  line-height: 1;
}

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

.btn-price-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.3rem;
  background-color: var(--navy-deep);
  color: #FFF;
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: 3px;
  margin-top: 0.6rem;
}

.btn-price-cta:hover {
  background-color: var(--navy);
  color: #FFF;
}

/* Section 09: 场景型深度评测 */
.review-shuttle-box {
  background-color: var(--surface);
  border-top: 3px solid var(--signal);
  border-bottom: 1px solid var(--border);
  padding: 2.5rem;
}

.review-summary-strips {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.5rem 0;
}

.review-strip {
  padding: 1rem 1.25rem;
  background-color: var(--bg);
  border-left: 3px solid var(--navy-deep);
  font-size: 0.95rem;
}

/* Section 10: 设备短编组 */
.device-short-group {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.device-short-item {
  padding: 1.25rem 1.6rem;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.device-short-item:nth-child(1) { width: 85%; margin-left: 0; border-left: 3px solid var(--navy); }
.device-short-item:nth-child(2) { width: 70%; margin-left: 12%; border-left: 3px solid var(--steel); }
.device-short-item:nth-child(3) { width: 78%; margin-left: 4%; border-left: 3px solid var(--brass); }
.device-short-item:nth-child(4) { width: 92%; margin-left: 2%; border-left: 3px solid var(--signal); }

/* Section 11: 问题短编组 */
.trouble-short-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.trouble-short-item {
  padding: 1.2rem 1.5rem;
  background-color: var(--surface);
  border-left: 3px solid var(--signal);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* Section 12: 场景文章中心 */
.article-center-wrap {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.featured-article-card {
  background-color: var(--surface);
  border-top: 3px solid var(--navy-deep);
  border-bottom: 1px solid var(--border);
  padding: 2rem;
}

.article-group-block {
  margin-bottom: 1.5rem;
}

.article-group-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--navy-deep);
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--brass);
}

.article-horizontal-list {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.article-horizontal-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.8rem 1.2rem;
  background-color: var(--surface);
  border-bottom: 1px solid var(--light-grey);
}

.article-item-title {
  font-weight: 700;
  color: var(--text);
  font-size: 1rem;
}

.article-item-title:hover {
  color: var(--signal);
}

.article-meta-info {
  font-size: 0.82rem;
  color: var(--muted);
  display: flex;
  gap: 1rem;
}

/* Section 13: 场景型 FAQ */
.faq-shuttle-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.faq-item {
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.faq-button {
  width: 100%;
  text-align: left;
  padding: 1.2rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy-deep);
  background: none;
}

.faq-button:hover {
  background-color: var(--bg);
}

.faq-category-badge {
  font-size: 0.78rem;
  padding: 0.15rem 0.5rem;
  background-color: var(--light-grey);
  color: var(--navy);
  font-weight: 600;
  border-radius: 2px;
  margin-right: 0.8rem;
}

.faq-icon {
  font-size: 1.2rem;
  font-weight: 400;
  transition: transform 0.2s ease;
}

.faq-item.is-open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 1.5rem 1.25rem 1.5rem;
  font-size: 0.98rem;
  color: var(--body);
  border-top: 1px dashed var(--light-grey);
  padding-top: 1rem;
}

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

/* Deep Navy Blue Footer (深海军蓝场景目录Footer) */
.site-footer {
  background-color: var(--navy-deep);
  color: #F8F8F5;
  padding-top: 3.5rem;
  padding-bottom: 2rem;
  font-size: 0.92rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

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

.footer-brand-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: #FFFFFF;
}

.footer-brand-desc {
  color: #C8D0D4;
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 1.2rem;
  position: relative;
  padding-bottom: 0.4rem;
}

.footer-col-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: var(--brass);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-link {
  color: #C8D0D4;
}

.footer-link:hover {
  color: #FFFFFF;
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(200, 208, 212, 0.2);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
  color: #87919A;
}

.friend-links {
  display: flex;
  gap: 1.2rem;
}

.friend-link {
  color: #C8D0D4;
}

.friend-link:hover {
  color: #FFFFFF;
}

/* ==================================================
   Article Page Layout Styles (文章页)
   ================================================== */

.article-page-wrap {
  padding-top: 3rem;
  padding-bottom: 5rem;
}

.breadcrumb-nav {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

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

.breadcrumb-nav span {
  margin: 0 0.4rem;
  color: var(--border-deep);
}

.article-header {
  margin-bottom: 2.5rem;
}

.article-title-h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  color: var(--navy-deep);
  margin-bottom: 1rem;
}

.article-meta-header {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  font-size: 0.88rem;
  color: var(--muted);
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

/* Quick Conclusion Box (快速结论) */
.quick-conclusion-box {
  background-color: var(--light-grey); /* #EFF0ED */
  border-left: 4px solid var(--navy-deep);
  border-top: 3px solid var(--signal);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
}

.quick-conclusion-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--navy-deep);
  margin-bottom: 0.6rem;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 3rem;
}

.article-main-content {
  background-color: var(--surface);
  padding: 2.5rem;
  border-top: 2px solid var(--navy-deep);
  border-bottom: 1px solid var(--border);
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-main-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--light-grey);
  color: var(--navy-deep);
}

.article-main-content h3 {
  margin-top: 1.8rem;
  margin-bottom: 0.8rem;
  color: var(--navy);
}

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

.article-main-content li {
  margin-bottom: 0.5rem;
}

.article-sidebar {
  position: sticky;
  top: 90px;
  height: fit-content;
}

.toc-box {
  background-color: var(--surface);
  padding: 1.5rem;
  border-top: 2px solid var(--navy-deep);
  border-bottom: 1px solid var(--border);
}

.toc-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--navy-deep);
  margin-bottom: 1rem;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.88rem;
}

.toc-link {
  color: var(--body);
}

.toc-link:hover {
  color: var(--signal);
}

/* Category Page Layout */
.category-hero-box {
  background-color: var(--surface);
  border-top: 3px solid var(--navy-deep);
  border-bottom: 1px solid var(--border);
  padding: 2.5rem;
  margin-bottom: 3rem;
}

/* ==================================================
   Responsive Media Queries (375, 390, 430, 768, 1024, 1440)
   ================================================== */

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .main-nav, .header-cta-desktop {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }

  /* Responsive shuttle blocks conversion to full-width single column */
  .shuttle-block-ai,
  .shuttle-block-video,
  .shuttle-block-daily,
  .shuttle-block-work,
  .video-strip-yt,
  .video-strip-nf,
  .video-strip-sp,
  .daily-shuttle-box,
  .work-long-group,
  .data-plan-item,
  .region-dir-item,
  .price-bar,
  .device-short-item {
    width: 100% !important;
    margin-left: 0 !important;
  }

  .price-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .price-plan-cost {
    text-align: left;
  }

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

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .article-main-content {
    padding: 1.5rem;
  }
}

/* prefers-reduced-motion support */
@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;
  }
}