/* OneLight机场 - 单光窗编辑系统 全局样式 */
:root {
  --bg: #F7F7F4;
  --surface: #FFFFFF;
  --light-window: #FFFDF5;
  --light-warm-grey: #F0EFEA;
  --text: #25282B;
  --body-text: #60656A;
  --muted: #8A9094;
  --graphite: #353A3E;
  --graphite-dark: #292D30;
  --mist-blue: #697A86;
  --mist-blue-dark: #52636E;
  --mist-blue-light: #E9EEF1;
  --gold: #B99A55;
  --gold-dark: #92773F;
  --gold-light: #F5EEDC;
  --cold-grey: #E6E8E8;
  --border: #D7DADB;
  --border-light: #EBE7DA;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg);
  overflow-x: hidden;
}

a {
  color: var(--graphite-dark);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
}

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

.header-container {
  max-width: 1280px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  user-select: none;
}

.logo-bar {
  width: 7px;
  height: 26px;
  background-color: var(--gold);
  border-radius: 1px;
  display: inline-block;
  flex-shrink: 0;
}

.logo-text {
  font-size: 22px;
  letter-spacing: -0.02em;
  display: inline-flex;
}

.logo-one {
  color: var(--graphite-dark);
  font-weight: 700;
}

.logo-light {
  color: var(--mist-blue);
  font-weight: 600;
}

.logo-sub {
  font-size: 13px;
  color: var(--muted);
  font-weight: 400;
  margin-left: 4px;
  padding-left: 8px;
  border-left: 1px solid var(--border);
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 14px;
  color: var(--body-text);
  font-weight: 500;
  position: relative;
  padding: 6px 0 6px 12px;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--graphite-dark);
}

.nav-link.active {
  color: var(--graphite-dark);
  font-weight: 600;
}

.nav-link.active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 14px;
  background-color: var(--gold);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--graphite-dark);
  color: #FFFFFF !important;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 4px;
  border: 1px solid var(--graphite-dark);
  transition: all 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary:hover {
  background-color: var(--graphite);
  border-color: var(--graphite);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: transparent;
  color: var(--graphite-dark);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 4px;
  border: 1px solid var(--border);
  transition: all 0.2s ease;
  cursor: pointer;
}

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

.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--mist-blue-dark);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 0;
  border-bottom: 1px solid var(--mist-blue);
  transition: all 0.2s ease;
}

.btn-link:hover {
  color: var(--graphite-dark);
  border-bottom-color: var(--graphite-dark);
}

.btn-gold {
  background-color: var(--gold);
  border-color: var(--gold);
  color: #FFFFFF !important;
}

.btn-gold:hover {
  background-color: var(--gold-dark);
  border-color: var(--gold-dark);
}

.btn-block {
  width: 100%;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.hamburger-line {
  width: 22px;
  height: 2px;
  background-color: var(--graphite-dark);
  transition: all 0.2s ease;
}

.mobile-menu {
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 20px 24px 28px 24px;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mobile-nav-link {
  font-size: 16px;
  color: var(--body-text);
  padding: 8px 0;
  border-bottom: 1px solid var(--border-light);
}

.mobile-cta-wrap {
  margin-top: 16px;
}

/* Hero Section */
.hero-section {
  padding: 70px 0 60px 0;
  position: relative;
  overflow: hidden;
  background-color: var(--bg);
}

.hero-editorial-layout {
  position: relative;
  min-height: 540px;
}

.hero-brand-backdrop {
  font-size: 110px;
  font-weight: 800;
  color: rgba(37, 40, 43, 0.03);
  letter-spacing: -0.04em;
  position: absolute;
  top: -30px;
  left: -10px;
  user-select: none;
  pointer-events: none;
  line-height: 1;
}

.hero-light-window {
  background-color: var(--light-window);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  border-radius: 4px;
  padding: 48px 52px;
  width: 72%;
  margin-left: auto;
  position: relative;
  z-index: 2;
  min-height: 380px;
}

.hero-content-overlay {
  position: relative;
  z-index: 3;
  margin-top: -360px;
  max-width: 900px;
}

.hero-tagline {
  font-size: 15px;
  font-weight: 600;
  color: var(--gold-dark);
  letter-spacing: 0.04em;
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
}

.hero-h1 {
  font-size: 46px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--graphite-dark);
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  max-width: 820px;
}

.hero-desc {
  font-size: 17px;
  color: var(--body-text);
  line-height: 1.8;
  max-width: 680px;
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

/* Hero Usage Index */
.hero-usage-index {
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.usage-index-item {
  padding: 12px 16px;
  background-color: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 4px;
}

.usage-index-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.usage-index-title::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--gold);
  border-radius: 50%;
}

.usage-index-desc {
  font-size: 13px;
  color: var(--muted);
}

/* Section Shared Layouts */
.section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.section-header {
  margin-bottom: 48px;
}

.section-num {
  font-size: 14px;
  font-weight: 700;
  color: var(--gold-dark);
  letter-spacing: 0.05em;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--graphite-dark);
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-direct-answer {
  background-color: var(--light-window);
  border-left: 3px solid var(--gold);
  padding: 18px 24px;
  font-size: 16px;
  color: var(--body-text);
  line-height: 1.8;
  border-radius: 0 4px 4px 0;
  max-width: 960px;
}

/* Light Window Editorial Box */
.light-window-box {
  background-color: var(--light-window);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 40px;
  position: relative;
}

/* Section 01: Usage Levels Grid */
.usage-window-wrapper {
  position: relative;
  margin-top: 36px;
}

.usage-levels-layout {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.usage-level-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 28px;
  position: relative;
  transition: border-color 0.2s ease;
}

.usage-level-card:hover {
  border-color: var(--gold);
}

.usage-level-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.usage-level-tag {
  font-size: 18px;
  font-weight: 700;
  color: var(--graphite-dark);
}

.usage-level-icon {
  font-size: 12px;
  font-weight: 600;
  padding: 3px 8px;
  background-color: var(--light-warm-grey);
  color: var(--mist-blue-dark);
  border-radius: 2px;
}

.usage-level-body p {
  font-size: 14px;
  color: var(--body-text);
  line-height: 1.7;
  margin-bottom: 12px;
}

.usage-level-features {
  list-style: none;
  font-size: 13px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.usage-level-features li {
  background-color: var(--bg);
  padding: 4px 10px;
  border-radius: 2px;
  border: 1px solid var(--border-light);
}

/* Section 02: Data Tiers */
.data-tiers-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 36px;
}

.data-tier-strip {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--mist-blue);
  padding: 24px 30px;
  border-radius: 0 4px 4px 0;
  display: grid;
  grid-template-columns: 140px 1fr auto;
  align-items: center;
  gap: 24px;
}

.data-tier-strip.highlight {
  border-left-color: var(--gold);
  background-color: var(--light-window);
}

.data-tier-gb {
  font-size: 36px;
  font-weight: 800;
  color: var(--graphite-dark);
  line-height: 1;
}

.data-tier-info h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 6px;
}

.data-tier-info p {
  font-size: 14px;
  color: var(--body-text);
  line-height: 1.6;
}

.data-tier-tag {
  font-size: 13px;
  font-weight: 600;
  color: var(--mist-blue-dark);
  background-color: var(--mist-blue-light);
  padding: 6px 14px;
  border-radius: 2px;
  white-space: nowrap;
}

/* Section 03: Devices Window */
.devices-window {
  background-color: var(--light-window);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 40px;
  margin-top: 36px;
}

.devices-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.device-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 24px 20px;
}

.device-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 8px;
}

.device-desc {
  font-size: 13px;
  color: var(--body-text);
  line-height: 1.6;
}

/* Section 04: AI & Streaming */
.platforms-light-window {
  background-color: var(--light-window);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 44px;
  margin-top: 36px;
}

.platform-block {
  margin-bottom: 32px;
}

.platform-block-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.platform-block-title::before {
  content: "";
  width: 4px;
  height: 16px;
  background-color: var(--gold);
  display: inline-block;
}

.platform-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.platform-tag {
  background-color: var(--surface);
  border: 1px solid var(--border);
  font-size: 13px;
  font-weight: 600;
  color: var(--graphite-dark);
  padding: 6px 14px;
  border-radius: 3px;
}

.shared-conditions-box {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 24px;
  border-radius: 4px;
  margin-top: 24px;
}

.shared-conditions-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 10px;
}

.shared-conditions-list {
  font-size: 14px;
  color: var(--body-text);
  line-height: 1.8;
}

/* Section 05: Region Blocks */
.regions-layout {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 36px;
}

.region-box {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 28px;
}

.region-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.region-name::before {
  content: "";
  width: 6px;
  height: 6px;
  background-color: var(--gold);
  border-radius: 50%;
}

.region-desc {
  font-size: 14px;
  color: var(--body-text);
  line-height: 1.75;
}

/* Section 06: Lines Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin-top: 36px;
}

.lines-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 14px;
}

.lines-table th {
  background-color: var(--graphite-dark);
  color: #FFFFFF;
  font-weight: 600;
  text-align: left;
  padding: 16px 20px;
  border-bottom: 2px solid var(--graphite);
}

.lines-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
  color: var(--body-text);
  line-height: 1.6;
}

.lines-table tr:nth-child(even) td {
  background-color: var(--light-window);
}

.lines-table tr:last-child td {
  border-bottom: none;
}

/* Section 07: Pricing Light Window Layout */
.pricing-window-layout {
  position: relative;
  margin-top: 40px;
}

.pricing-featured-window {
  background-color: var(--light-window);
  border: 2px solid var(--gold);
  border-radius: 6px;
  padding: 44px;
  max-width: 520px;
  margin: 0 auto;
  position: relative;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.pricing-featured-badge {
  position: absolute;
  top: -14px;
  left: 36px;
  background-color: var(--gold);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 2px;
  letter-spacing: 0.05em;
}

.pricing-plan-name {
  font-size: 24px;
  font-weight: 800;
  color: var(--graphite-dark);
  margin-bottom: 8px;
}

.pricing-plan-price {
  font-size: 42px;
  font-weight: 800;
  color: var(--graphite-dark);
  margin-bottom: 6px;
  line-height: 1;
}

.pricing-plan-price span {
  font-size: 16px;
  font-weight: 400;
  color: var(--muted);
}

.pricing-plan-data {
  font-size: 18px;
  font-weight: 700;
  color: var(--gold-dark);
  margin-bottom: 20px;
}

.pricing-plan-desc {
  font-size: 14px;
  color: var(--body-text);
  line-height: 1.7;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.pricing-outer-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 36px;
}

.pricing-outer-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.pricing-outer-info h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 4px;
}

.pricing-outer-info p {
  font-size: 13px;
  color: var(--muted);
}

.pricing-outer-price {
  font-size: 24px;
  font-weight: 700;
  color: var(--graphite-dark);
  white-space: nowrap;
}

/* Section 08: Review Box */
.review-light-window {
  background-color: var(--light-window);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 48px;
  margin-top: 36px;
}

.review-summary-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 16px;
}

.review-summary-text {
  font-size: 16px;
  color: var(--body-text);
  line-height: 1.8;
  margin-bottom: 28px;
}

.review-entry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.review-entry-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--graphite-dark);
  text-align: center;
}

/* Section 09: Clients */
.clients-layout {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 36px;
}

.client-box {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 30px;
}

.client-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.client-os {
  font-size: 20px;
  font-weight: 700;
  color: var(--graphite-dark);
}

.client-app {
  font-size: 13px;
  font-weight: 600;
  color: var(--mist-blue-dark);
  background-color: var(--mist-blue-light);
  padding: 4px 10px;
  border-radius: 2px;
}

.client-desc {
  font-size: 14px;
  color: var(--body-text);
  line-height: 1.7;
}

/* Section 10: Maintenance Checklist */
.maintenance-window {
  background-color: var(--light-window);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 40px;
  margin-top: 36px;
}

.maintenance-center-note {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--gold);
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 32px;
  border-radius: 0 4px 4px 0;
}

.maintenance-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.maintenance-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 20px 16px;
}

.maintenance-item-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--gold-dark);
  margin-bottom: 6px;
}

.maintenance-item-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 8px;
}

.maintenance-item-desc {
  font-size: 13px;
  color: var(--body-text);
  line-height: 1.6;
}

/* Section 11: Articles Editorial Directory */
.articles-directory {
  display: flex;
  flex-direction: column;
  gap: 32px;
  margin-top: 36px;
}

.article-category-group {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 32px;
}

.article-group-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-group-title::before {
  content: "";
  width: 4px;
  height: 16px;
  background-color: var(--gold);
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-list-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}

.article-list-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.article-item-left {
  max-width: 800px;
}

.article-item-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 6px;
  display: block;
}

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

.article-item-excerpt {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.article-item-meta {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

/* Section 12: FAQ Light Window Accordion */
.faq-window-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 36px;
}

.faq-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.faq-button {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background-color: var(--surface);
  border: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--graphite-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

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

.faq-icon {
  font-size: 18px;
  font-weight: 400;
  color: var(--gold-dark);
  transition: transform 0.2s ease;
}

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

.faq-answer {
  padding: 0 24px 24px 24px;
  font-size: 15px;
  color: var(--body-text);
  line-height: 1.8;
  background-color: var(--light-window);
  border-top: 1px solid var(--border-light);
}

/* Article Page Specifics */
.article-page-main {
  padding: 60px 0 90px 0;
  background-color: var(--bg);
}

.breadcrumb-nav {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.breadcrumb-nav a:hover {
  color: var(--gold-dark);
}

.article-hero-window {
  background-color: var(--light-window);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--gold);
  border-radius: 0 4px 4px 0;
  padding: 40px;
  margin-bottom: 40px;
}

.article-category-tag {
  font-size: 13px;
  font-weight: 700;
  color: var(--gold-dark);
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  display: inline-block;
}

.article-h1 {
  font-size: 38px;
  font-weight: 700;
  color: var(--graphite-dark);
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
  color: var(--muted);
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

.article-content-wrapper {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 48px;
}

.article-body {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 48px 52px;
  max-width: 820px;
}

.quick-conclusion-box {
  background-color: var(--light-window);
  border-left: 3px solid var(--gold);
  padding: 24px;
  border-radius: 0 4px 4px 0;
  margin-bottom: 36px;
}

.quick-conclusion-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 8px;
}

.quick-conclusion-text {
  font-size: 15px;
  color: var(--body-text);
  line-height: 1.8;
}

.article-body h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin: 40px 0 18px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
  line-height: 1.35;
}

.article-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin: 28px 0 14px 0;
}

.article-body p {
  font-size: 16px;
  color: var(--body-text);
  line-height: 1.85;
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 0 0 24px 24px;
  color: var(--body-text);
  line-height: 1.8;
}

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

.article-interlinks-box {
  background-color: var(--light-window);
  border: 1px solid var(--border-light);
  padding: 28px;
  border-radius: 4px;
  margin-top: 48px;
}

.article-sidebar {
  position: sticky;
  top: 100px;
  height: fit-content;
}

.sidebar-toc {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 24px;
}

.sidebar-toc-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--graphite-dark);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.sidebar-toc-list {
  list-style: none;
  font-size: 13px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-toc-list a {
  color: var(--body-text);
  line-height: 1.4;
  display: block;
}

.sidebar-toc-list a:hover {
  color: var(--gold-dark);
}

/* Category Page */
.category-hero-window {
  background-color: var(--light-window);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 44px;
  margin-bottom: 40px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 36px;
  align-items: center;
}

.category-hero-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--graphite-dark);
}

.category-hero-desc {
  font-size: 15px;
  color: var(--body-text);
  line-height: 1.8;
}

/* Footer */
.site-footer {
  background-color: var(--graphite);
  color: #F8F8F5;
  padding: 60px 0 30px 0;
  margin-top: auto;
  border-top: 1px solid var(--graphite-dark);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 36px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  font-size: 13px;
  color: #C7CCCE;
  margin: 16px 0 20px 0;
  line-height: 1.6;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

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

.footer-links a {
  font-size: 13px;
  color: #C7CCCE;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-friends {
  padding: 20px 0;
  border-top: 1px solid #454B50;
  border-bottom: 1px solid #454B50;
  font-size: 13px;
  color: #C7CCCE;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-friends a {
  color: #F8F8F5;
}

.footer-friends a:hover {
  color: var(--gold-light);
}

.friend-sep {
  color: #60656A;
}

.footer-bottom {
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: #8A9094;
}

/* Responsive Rules */
@media (max-width: 1024px) {
  .hero-light-window { width: 100%; min-height: auto; }
  .hero-content-overlay { margin-top: 0; }
  .hero-h1 { font-size: 36px; }
  .hero-usage-index { grid-template-columns: repeat(2, 1fr); }
  .pricing-outer-grid { grid-template-columns: 1fr; }
  .review-entry-grid { grid-template-columns: repeat(2, 1fr); }
  .maintenance-grid { grid-template-columns: repeat(2, 1fr); }
  .article-content-wrapper { grid-template-columns: 1fr; }
  .article-sidebar { display: none; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .desktop-nav { display: none; }
  .mobile-menu-btn { display: flex; }
  .usage-levels-layout { grid-template-columns: 1fr; }
  .devices-grid { grid-template-columns: repeat(2, 1fr); }
  .regions-layout { grid-template-columns: 1fr; }
  .clients-layout { grid-template-columns: 1fr; }
  .category-hero-window { grid-template-columns: 1fr; gap: 16px; }
  .section-title { font-size: 26px; }
  .article-h1 { font-size: 28px; }
  .article-body { padding: 28px 24px; }
  .data-tier-strip { grid-template-columns: 1fr; text-align: left; }
}

@media (max-width: 480px) {
  .hero-h1 { font-size: 28px; }
  .hero-usage-index { grid-template-columns: 1fr; }
  .devices-grid { grid-template-columns: 1fr; }
  .review-entry-grid { grid-template-columns: 1fr; }
  .maintenance-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

@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;
  }
}