/* --------------------------------------------------
   自由航线机场 - 第2套：航行清单系统 (Checklist System)
   CSS Dynamic & Static Stylesheet
   -------------------------------------------------- */

:root {
  --bg: #F5F0E6;
  --paper: #FFFCF6;
  --surface: #FFFFFF;
  --text: #25231F;
  --body-text: #625D54;
  --muted: #8C8579;
  --dark-olive: #34352F;
  --olive: #68705A;
  --deep-olive: #515845;
  --light-olive: #EAECE3;
  --brick: #9C584A;
  --dark-brick: #784238;
  --light-brick: #F1E2DE;
  --brass: #A28358;
  --dark-brass: #866A46;
  --light-brass: #F2E9DB;
  --paper-gray: #EEE8DD;
  --border: #D9D0C2;
  --dark-border: #C7BAA9;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --font-mono: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;

  --container-width: 1200px;
  --article-width: 800px;
  --header-height: 72px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  background-color: var(--bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

/* Accessibility & Focus */
:focus-visible {
  outline: 2px solid var(--brick);
  outline-offset: 3px;
}

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

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

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

/* Typography Standards */
h1, h2, h3, h4, h5, h6 {
  color: var(--text);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(32px, 5vw, 54px);
  margin-bottom: 20px;
}

h2 {
  font-size: clamp(24px, 3.5vw, 34px);
  margin-bottom: 16px;
}

h3 {
  font-size: clamp(18px, 2.5vw, 24px);
  margin-bottom: 12px;
}

p {
  margin-bottom: 16px;
  color: var(--body-text);
}

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

.mono-num {
  font-family: var(--font-mono);
  font-weight: 700;
}

/* Structural Layout */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.article-container {
  width: 100%;
  max-width: var(--article-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

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

.brand-logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--dark-olive);
  border-radius: 4px;
  padding: 6px;
}

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

.brand-name {
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
}

.brand-sub {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.05em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--body-text);
  padding: 6px 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--deep-olive);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--brass);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
  background-color: var(--deep-olive);
  border-radius: 4px;
  border: 1px solid var(--dark-olive);
  transition: var(--transition);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.header-cta:hover {
  background-color: var(--brick);
  border-color: var(--dark-brick);
  color: var(--paper);
}

/* Mobile Header Controls */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text);
}

.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg);
  border-top: 1px solid var(--border);
  padding: 24px;
  overflow-y: auto;
  z-index: 99;
}

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

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  list-style: none;
}

.mobile-nav-link {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  display: block;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
}

/* Common Section Styling */
.section {
  padding: 72px 0;
  border-bottom: 1px solid var(--border);
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--brass);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.section-header {
  margin-bottom: 40px;
}

.section-num-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.sec-num {
  font-size: 24px;
  font-weight: 800;
  color: var(--brass);
  font-family: var(--font-mono);
}

.lead-text {
  font-size: 18px;
  line-height: 1.8;
  color: var(--body-text);
  max-width: 860px;
}

/* Checklist Styling Elements */
.checklist-card {
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 32px;
  margin-bottom: 24px;
  box-shadow: 0 2px 8px rgba(37, 35, 31, 0.03);
}

.checklist-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.checklist-num {
  font-size: 22px;
  font-weight: 800;
  color: var(--olive);
  font-family: var(--font-mono);
  background-color: var(--light-olive);
  padding: 4px 12px;
  border-radius: 4px;
}

.checklist-title {
  font-size: 22px;
  color: var(--text);
  font-weight: 700;
}

/* Hero Section Specifics */
.hero-section {
  padding: 60px 0 72px 0;
  background-color: var(--bg);
}

.hero-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--light-brass);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  font-weight: 700;
  color: var(--dark-brass);
  margin-bottom: 20px;
}

.hero-content {
  margin-bottom: 48px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 28px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
  background-color: var(--brick);
  border-radius: 4px;
  border: 1px solid var(--dark-brick);
  transition: var(--transition);
}

.btn-primary:hover {
  background-color: var(--dark-brick);
  color: var(--paper);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  background-color: var(--paper);
  border-radius: 4px;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.btn-secondary:hover {
  background-color: var(--paper-gray);
  border-color: var(--dark-border);
}

/* Hero Checklist Overview (Large Directory Layout) */
.hero-checklist-container {
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 36px;
  box-shadow: 0 4px 16px rgba(37, 35, 31, 0.04);
}

.hero-checklist-title-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 24px;
}

.hero-checklist-main-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--dark-olive);
  display: flex;
  align-items: center;
  gap: 10px;
}

.hero-checklist-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px 32px;
}

.hero-checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: var(--transition);
}

.hero-checklist-item:hover {
  border-color: var(--brass);
  background-color: var(--paper);
}

.hero-checklist-item.full-width {
  grid-column: 1 / -1;
}

.item-num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 800;
  color: var(--brick);
  line-height: 1.2;
}

.item-body {
  flex: 1;
}

.item-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.item-desc {
  font-size: 14px;
  color: var(--body-text);
  line-height: 1.6;
}

/* Device Section Styling */
.device-checklist-table {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.device-row {
  display: grid;
  grid-template-columns: 180px 1fr 1fr;
  gap: 24px;
  padding: 24px;
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 4px;
  border-left: 4px solid var(--olive);
}

.device-col-name {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.device-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--dark-olive);
}

.device-sub {
  font-size: 13px;
  color: var(--muted);
}

.device-col-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--brass);
  margin-bottom: 6px;
  text-transform: uppercase;
}

.device-col-content {
  font-size: 15px;
  color: var(--body-text);
  line-height: 1.7;
}

/* Client Section Styling */
.client-group-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.client-block {
  background-color: var(--paper);
  border: 1px solid var(--border);
  padding: 28px;
  border-radius: 4px;
}

.client-block-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark-olive);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.client-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.client-list-item {
  font-size: 15px;
  line-height: 1.6;
  padding-left: 16px;
  position: relative;
}

.client-list-item::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--brass);
}

/* Relationship Section Styling */
.relationship-box {
  background-color: var(--paper);
  border: 1px solid var(--border);
  padding: 32px;
  border-radius: 6px;
}

.bracket-flow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding: 24px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: 24px;
}

.flow-node {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  padding: 8px 16px;
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.flow-relation {
  font-size: 14px;
  font-weight: 700;
  color: var(--brick);
  font-family: var(--font-mono);
}

/* Node Section Styling */
.node-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.node-card {
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 24px;
  border-top: 3px solid var(--brass);
}

.node-region-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.node-scene {
  font-size: 14px;
  font-weight: 600;
  color: var(--olive);
  margin-bottom: 12px;
}

.node-desc {
  font-size: 15px;
  color: var(--body-text);
  line-height: 1.7;
}

.node-sequence-box {
  margin-top: 32px;
  padding: 24px;
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.seq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  list-style: none;
}

.seq-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 15px;
}

.seq-idx {
  font-family: var(--font-mono);
  font-weight: 800;
  color: var(--brick);
}

/* Use Case Section Styling */
.usecase-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.usecase-row {
  display: grid;
  grid-template-columns: 80px 200px 1fr;
  gap: 24px;
  padding: 28px;
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.usecase-code {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 800;
  color: var(--brass);
}

.usecase-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}

.usecase-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Common Problems Section Styling */
.problems-table {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.problem-row {
  display: grid;
  grid-template-columns: 280px 1fr 1fr;
  gap: 24px;
  padding: 20px 24px;
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 4px;
  align-items: center;
}

.prob-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.prob-cause {
  font-size: 14px;
  color: var(--body-text);
}

.prob-action {
  font-size: 14px;
  color: var(--olive);
  font-weight: 600;
}

/* System Settings Section Styling */
.sys-setting-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sys-setting-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 28px;
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.sys-setting-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--dark-olive);
}

.sys-setting-desc {
  font-size: 15px;
  color: var(--body-text);
  line-height: 1.7;
}

/* Traffic Planning Section Styling */
.traffic-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.traffic-card {
  background-color: var(--paper);
  border: 1px solid var(--border);
  padding: 24px;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.traffic-amount {
  font-size: 28px;
  font-weight: 800;
  color: var(--brick);
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

.traffic-fit {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

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

/* Pricing Section Styling (航行清单价目) */
.pricing-disclaimer {
  padding: 12px 18px;
  background-color: var(--light-brass);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  color: var(--dark-brass);
  margin-bottom: 24px;
  font-weight: 600;
}

.pricing-checklist {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pricing-row {
  display: grid;
  grid-template-columns: 60px 160px 1fr 140px 160px 160px;
  gap: 20px;
  align-items: center;
  padding: 24px;
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: var(--transition);
}

.pricing-row.highlight {
  background-color: var(--light-olive);
  border-left: 4px solid var(--olive);
}

.pricing-num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 800;
  color: var(--muted);
}

.pricing-plan-name {
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  display: flex;
  flex-direction: column;
}

.pricing-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--paper);
  background-color: var(--brick);
  padding: 2px 6px;
  border-radius: 2px;
  margin-top: 4px;
  width: fit-content;
}

.pricing-target {
  font-size: 14px;
  color: var(--body-text);
}

.pricing-data {
  font-size: 16px;
  font-weight: 700;
  color: var(--dark-olive);
  font-family: var(--font-mono);
}

.pricing-price {
  font-size: 28px;
  font-weight: 800;
  color: var(--brick);
  font-family: var(--font-mono);
}

.pricing-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
  background-color: var(--deep-olive);
  border-radius: 4px;
  transition: var(--transition);
}

.pricing-cta-btn:hover {
  background-color: var(--brick);
  color: var(--paper);
}

/* Review Section Styling */
.review-summary-card {
  background-color: var(--paper);
  border: 1px solid var(--border);
  padding: 36px;
  border-radius: 6px;
}

.review-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--brick);
  background-color: var(--light-brick);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 16px;
}

.review-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 28px 0;
}

.review-summary-item {
  padding: 16px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.review-summary-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

/* Tutorials / Article Index Styling */
.tutorial-phase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

.phase-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark-olive);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tutorial-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tutorial-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tutorial-link {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.tutorial-link:hover {
  color: var(--brick);
}

.tutorial-sub {
  font-size: 13px;
  color: var(--muted);
}

/* FAQ Accordion Styling */
.faq-group {
  margin-bottom: 32px;
}

.faq-group-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--dark-olive);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-button {
  width: 100%;
  text-align: left;
  padding: 18px 24px;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  gap: 16px;
}

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

.faq-icon {
  font-size: 20px;
  font-weight: 400;
  color: var(--brass);
  transition: transform 0.25s ease;
}

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

.faq-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background-color: var(--paper);
}

.faq-panel-content {
  padding: 0 24px 20px 24px;
  font-size: 15px;
  color: var(--body-text);
  line-height: 1.8;
  border-top: 1px dashed var(--border);
  margin-top: 4px;
  padding-top: 16px;
}

/* Article Page Layout & Content */
.article-header {
  padding: 48px 0 32px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 16px;
}

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

.breadcrumb a:hover {
  color: var(--brick);
}

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

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--muted);
  margin-top: 16px;
  flex-wrap: wrap;
}

.quick-conclusion {
  background-color: var(--light-brick);
  border-left: 4px solid var(--brick);
  padding: 24px;
  border-radius: 4px;
  margin-bottom: 40px;
}

.quick-conclusion-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--dark-brick);
  margin-bottom: 8px;
}

.article-content h2 {
  margin-top: 40px;
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.article-content h3 {
  margin-top: 28px;
  margin-bottom: 14px;
}

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

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

.article-content blockquote {
  background-color: var(--paper);
  border-left: 4px solid var(--brass);
  padding: 16px 20px;
  margin-bottom: 24px;
  font-style: italic;
}

.related-reads {
  margin-top: 56px;
  padding: 32px;
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.related-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark-olive);
  margin-bottom: 16px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

/* Category Page Specifics */
.category-hero {
  padding: 48px 0;
  background-color: var(--paper);
  border-bottom: 1px solid var(--border);
}

.category-badge {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 14px;
  color: var(--brass);
  margin-bottom: 8px;
}

/* Footer (深橄榄新手准备型 Footer) */
.site-footer {
  background-color: var(--deep-olive);
  color: #FFFDF7;
  padding: 60px 0 32px 0;
  margin-top: auto;
  border-top: 1px solid var(--dark-olive);
}

.footer-grid {
  display: grid;
  grid-template-columns: 280px repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-logo-title {
  font-size: 20px;
  font-weight: 800;
  color: #FFFDF7;
}

.footer-sub {
  font-size: 13px;
  color: #D9DDCF;
}

.footer-col-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--brass);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

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

.footer-nav-link {
  font-size: 14px;
  color: #D9DDCF;
}

.footer-nav-link:hover {
  color: #FFFDF7;
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(217, 221, 207, 0.2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 13px;
  color: #D9DDCF;
}

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

.friend-link {
  color: #D9DDCF;
}

.friend-link:hover {
  color: #FFFDF7;
}

/* Motion Preferences */
@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;
  }
}

/* Responsive Breakpoints */

/* 1024px Desktop/Tablet */
@media (max-width: 1024px) {
  .pricing-row {
    grid-template-columns: 40px 140px 1fr 120px 120px;
  }
  .client-group-grid {
    grid-template-columns: 1fr;
  }
  .traffic-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* 768px Tablet & Below */
@media (max-width: 768px) {
  .main-nav, .header-cta {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-checklist-grid {
    grid-template-columns: 1fr;
  }
  .device-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .node-grid {
    grid-template-columns: 1fr;
  }
  .usecase-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .problem-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .sys-setting-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .pricing-row {
    grid-template-columns: 1fr;
    gap: 12px;
    border-left: 4px solid var(--brass);
  }
  .pricing-num {
    display: none;
  }
  .tutorial-phase-grid {
    grid-template-columns: 1fr;
  }
  .review-summary-grid {
    grid-template-columns: 1fr;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .bracket-flow {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* 430px / 390px / 375px Mobile Screen Enhancements */
@media (max-width: 480px) {
  .container, .article-container {
    padding: 0 16px;
  }
  .section {
    padding: 48px 0;
  }
  .hero-section {
    padding: 36px 0 48px 0;
  }
  .hero-checklist-container {
    padding: 20px 16px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
  .traffic-grid {
    grid-template-columns: 1fr;
  }
}