/* ==========================================================================
   FlyingBirds飞鸟云 网络加速服务 / 官方推广站 - 核心设计规范
   Underwater Exploration Theme:
   Deep Ocean: #062C3C | Seafoam: #77E0C5 | Pearl: #F4FAF8 | Coral: #FF856D
   ========================================================================== */

:root {
  --color-deep-ocean: #062C3C;
  --color-abyss: #031720;
  --color-trench: #020F16;
  --color-mid-ocean: #0B425B;
  --color-shallow-ocean: #105574;
  --color-seafoam: #77E0C5;
  --color-seafoam-dark: #37B899;
  --color-seafoam-light: #A8F1DF;
  --color-pearl: #F4FAF8;
  --color-pearl-muted: #D5E7E2;
  --color-pearl-dark: #A9C2BA;
  --color-coral: #FF856D;
  --color-coral-dark: #E6684E;
  --color-coral-light: #FFA694;
  --color-surface-trans: rgba(6, 44, 60, 0.75);
  --color-card-bg: rgba(11, 66, 91, 0.45);
  --color-border: rgba(119, 224, 197, 0.22);
  --color-border-glow: rgba(119, 224, 197, 0.5);

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

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-xl: 22px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(3, 23, 32, 0.4);
  --shadow-md: 0 6px 20px rgba(3, 23, 32, 0.55);
  --shadow-glow: 0 0 24px rgba(119, 224, 197, 0.25);
  --shadow-coral: 0 0 20px rgba(255, 133, 109, 0.35);

  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s ease;
  --transition-slow: 0.45s cubic-bezier(0.16, 1, 0.3, 1);

  --container-max: 1240px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-deep-ocean);
  color: var(--color-pearl);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Ambient Deep-sea Particle Overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background-image: 
    radial-gradient(circle at 15% 30%, rgba(119, 224, 197, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 85% 70%, rgba(255, 133, 109, 0.04) 0%, transparent 45%),
    radial-gradient(circle at 50% 90%, rgba(6, 44, 60, 0.8) 0%, transparent 60%);
  z-index: -1;
}

/* Accessible Focus States */
:focus-visible {
  outline: 2px solid var(--color-seafoam);
  outline-offset: 3px;
}

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

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

ul, ol {
  list-style: none;
}

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

.depth-mono-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-seafoam);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.depth-mono-label::before {
  content: "//";
  color: var(--color-coral);
  font-weight: 700;
}

.section-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 48px auto;
}
.section-title {
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-pearl);
  margin-bottom: 14px;
  line-height: 1.25;
}
.section-desc {
  font-size: 1.05rem;
  color: var(--color-pearl-muted);
  line-height: 1.7;
}

/* Buttons & Commercial CTAs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-coral {
  background-color: var(--color-coral);
  color: #031720;
  box-shadow: 0 4px 14px rgba(255, 133, 109, 0.35);
}
.btn-coral:hover {
  background-color: var(--color-coral-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 133, 109, 0.5);
}
.btn-coral:active {
  transform: translateY(0);
}

.btn-seafoam {
  background-color: var(--color-seafoam);
  color: #031720;
  box-shadow: 0 4px 14px rgba(119, 224, 197, 0.3);
}
.btn-seafoam:hover {
  background-color: var(--color-seafoam-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(119, 224, 197, 0.45);
}

.btn-outline-seafoam {
  background-color: transparent;
  color: var(--color-seafoam);
  border-color: var(--color-seafoam);
}
.btn-outline-seafoam:hover {
  background-color: rgba(119, 224, 197, 0.12);
  transform: translateY(-2px);
}

.btn-outline-pearl {
  background-color: transparent;
  color: var(--color-pearl);
  border-color: rgba(244, 250, 248, 0.4);
}
.btn-outline-pearl:hover {
  border-color: var(--color-pearl);
  background-color: rgba(244, 250, 248, 0.08);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.88rem;
}
.btn-lg {
  padding: 15px 32px;
  font-size: 1.1rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(6, 44, 60, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-fast);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-pearl);
  letter-spacing: -0.02em;
}
.brand-logo svg {
  width: 36px;
  height: 36px;
  min-width: 36px;
  max-width: 36px;
  flex-shrink: 0;
  display: block;
}
.brand-logo-text {
  display: flex;
  flex-direction: column;
}
.brand-name {
  color: var(--color-seafoam);
  line-height: 1.1;
  font-size: 1.3rem;
}
.brand-tag {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  color: var(--color-coral);
  letter-spacing: 0.08em;
}

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

.nav-link {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--color-pearl-muted);
  position: relative;
  padding: 6px 0;
}
.nav-link:hover, .nav-link.active {
  color: var(--color-seafoam);
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--color-seafoam);
  transition: width var(--transition-fast);
}
.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Mobile Hamburger Toggle */
.hamburger-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  color: var(--color-pearl);
}
.hamburger-btn svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-seafoam);
}

/* ==========================================================================
   Hero Section - Underwater Cross-Section
   ========================================================================== */
.hero-section {
  position: relative;
  padding-top: 48px;
  padding-bottom: 70px;
  overflow: hidden;
  background: linear-gradient(180deg, #09374C 0%, #062C3C 45%, #031720 100%);
  border-bottom: 1px solid var(--color-border);
}

/* Waterline Divider Animation */
.waterline-banner {
  position: relative;
  width: 100%;
  height: 38px;
  margin: 32px 0 20px 0;
  overflow: hidden;
}
.waterline-svg {
  width: 100%;
  height: 38px;
}

.hero-surface-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.hero-waterline-status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  background-color: rgba(11, 66, 91, 0.6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  margin-bottom: 22px;
}
.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-seafoam);
  box-shadow: 0 0 8px var(--color-seafoam);
  animation: pulse 2s infinite;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.hero-title .highlight-seafoam {
  color: var(--color-seafoam);
  text-shadow: 0 0 30px rgba(119, 224, 197, 0.35);
}
.hero-title .highlight-coral {
  color: var(--color-coral);
}

.hero-desc {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--color-pearl-muted);
  max-width: 720px;
  margin: 0 auto 32px auto;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}

.hero-sub-notice {
  font-size: 0.86rem;
  color: var(--color-pearl-dark);
}
.hero-sub-notice span {
  color: var(--color-seafoam);
}

/* Submarine Showcase Below Waterline */
.hero-underwater-visual {
  position: relative;
  margin-top: 24px;
  padding: 30px 20px;
  border-radius: var(--radius-xl);
  background: radial-gradient(ellipse at 50% 40%, rgba(11, 66, 91, 0.4) 0%, rgba(3, 23, 32, 0.8) 85%);
  border: 1px solid var(--color-border);
  box-shadow: inset 0 0 60px rgba(6, 44, 60, 0.9);
}

.submarine-svg-wrapper {
  max-width: 820px;
  margin: 0 auto;
  position: relative;
}

.submarine-metric-badges {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.submarine-badge {
  background: rgba(6, 44, 60, 0.65);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.submarine-badge svg {
  width: 28px;
  height: 28px;
  stroke: var(--color-seafoam);
  flex-shrink: 0;
}
.badge-meta {
  display: flex;
  flex-direction: column;
}
.badge-title {
  font-size: 0.76rem;
  font-family: var(--font-mono);
  color: var(--color-coral);
  letter-spacing: 0.06em;
}
.badge-value {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--color-pearl);
}

/* ==========================================================================
   Section 1: Advantages - Research Notes Layout (Field Journal Style)
   ========================================================================== */
.section-advantages {
  padding: 90px 0;
  background-color: var(--color-deep-ocean);
  position: relative;
}

.research-notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.research-note-card {
  background-color: rgba(11, 66, 91, 0.35);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-seafoam);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
}
.research-note-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-seafoam);
  background-color: rgba(11, 66, 91, 0.55);
}
.research-note-card.priority-high {
  border-left-color: var(--color-coral);
}

.note-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(119, 224, 197, 0.2);
}
.note-id {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-coral);
  font-weight: 700;
}
.note-stamp {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-seafoam);
  background: rgba(119, 224, 197, 0.1);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.note-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-pearl);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.note-title svg {
  width: 22px;
  height: 22px;
  stroke: var(--color-seafoam);
}

.note-body {
  font-size: 0.95rem;
  color: var(--color-pearl-muted);
  line-height: 1.68;
  margin-bottom: 18px;
  flex-grow: 1;
}

.note-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}
.note-tag {
  font-size: 0.74rem;
  font-family: var(--font-mono);
  color: var(--color-pearl-muted);
  background-color: rgba(6, 44, 60, 0.8);
  border: 1px solid rgba(119, 224, 197, 0.15);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Section 2: Network Destinations - Underwater Route Diagram
   ========================================================================== */
.section-network {
  padding: 90px 0;
  background: linear-gradient(180deg, var(--color-deep-ocean) 0%, var(--color-abyss) 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.route-diagram-container {
  background: rgba(6, 44, 60, 0.6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  position: relative;
  margin-bottom: 40px;
}

.route-map-visual {
  width: 100%;
  border-radius: var(--radius-md);
  margin-bottom: 30px;
  overflow: hidden;
  background-color: #03141C;
  border: 1px solid rgba(119, 224, 197, 0.15);
}

.route-nodes-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.route-node-item {
  background: rgba(11, 66, 91, 0.35);
  border: 1px solid rgba(119, 224, 197, 0.15);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all var(--transition-fast);
}
.route-node-item:hover {
  border-color: var(--color-seafoam);
  background: rgba(11, 66, 91, 0.6);
  transform: translateY(-2px);
}

.node-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.node-flag-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-pearl);
}
.node-line-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: rgba(255, 133, 109, 0.15);
  color: var(--color-coral);
  border: 1px solid rgba(255, 133, 109, 0.3);
}
.node-line-badge.seafoam {
  background: rgba(119, 224, 197, 0.15);
  color: var(--color-seafoam);
  border-color: rgba(119, 224, 197, 0.3);
}

.node-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--color-pearl-dark);
  font-family: var(--font-mono);
}
.node-latency {
  color: var(--color-seafoam);
  font-weight: 600;
}
.node-status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-seafoam);
  margin-right: 4px;
}

/* ==========================================================================
   Section 3: AI & Streaming - Split Editorial Panels
   ========================================================================== */
.section-editorial {
  padding: 90px 0;
  background-color: var(--color-deep-ocean);
  position: relative;
}

.split-editorial-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 900px) {
  .split-editorial-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

.editorial-panel {
  background: rgba(6, 44, 60, 0.7);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

.editorial-header {
  padding: 30px 30px 20px 30px;
  background: linear-gradient(180deg, rgba(11, 66, 91, 0.5) 0%, transparent 100%);
  border-bottom: 1px solid rgba(119, 224, 197, 0.12);
}

.editorial-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}
.editorial-badge.coral {
  color: var(--color-coral);
  background: rgba(255, 133, 109, 0.15);
  border: 1px solid rgba(255, 133, 109, 0.3);
}
.editorial-badge.seafoam {
  color: var(--color-seafoam);
  background: rgba(119, 224, 197, 0.15);
  border: 1px solid rgba(119, 224, 197, 0.3);
}

.editorial-title {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--color-pearl);
  margin-bottom: 10px;
  line-height: 1.3;
}
.editorial-lead {
  font-size: 0.96rem;
  color: var(--color-pearl-muted);
  line-height: 1.65;
}

.editorial-scenarios {
  padding: 24px 30px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  flex-grow: 1;
}

.scenario-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(119, 224, 197, 0.08);
}
.scenario-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.scenario-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: rgba(11, 66, 91, 0.8);
  border: 1px solid rgba(119, 224, 197, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-seafoam);
  font-weight: 700;
  font-size: 0.82rem;
}
.scenario-icon.coral-accent {
  color: var(--color-coral);
  border-color: rgba(255, 133, 109, 0.3);
}

.scenario-content h4 {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--color-pearl);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.scenario-tag-pill {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  background: rgba(119, 224, 197, 0.12);
  color: var(--color-seafoam);
}
.scenario-content p {
  font-size: 0.88rem;
  color: var(--color-pearl-muted);
  line-height: 1.6;
}

.editorial-footer {
  padding: 18px 30px 24px 30px;
  background-color: rgba(3, 23, 32, 0.4);
  border-top: 1px solid rgba(119, 224, 197, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.editorial-footer-text {
  font-size: 0.84rem;
  color: var(--color-pearl-dark);
}

/* ==========================================================================
   Section 4: Pricing - Clean Comparison Table
   ========================================================================== */
.section-pricing {
  padding: 90px 0;
  background: linear-gradient(180deg, var(--color-deep-ocean) 0%, var(--color-abyss) 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.pricing-notice-box {
  background: rgba(11, 66, 91, 0.3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  max-width: 820px;
  margin: -24px auto 36px auto;
  font-size: 0.86rem;
  color: var(--color-pearl-muted);
  display: flex;
  align-items: center;
  gap: 12px;
}
.pricing-notice-box svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-coral);
  flex-shrink: 0;
}

.table-responsive-container {
  overflow-x: auto;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background-color: rgba(6, 44, 60, 0.7);
  box-shadow: var(--shadow-md);
  margin-bottom: 30px;
}

.pricing-cycle-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 24px;
}
.cycle-tab-btn {
  background: rgba(11, 66, 91, 0.5);
  border: 1px solid var(--color-border);
  color: var(--color-pearl-muted);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}
.cycle-tab-btn:hover {
  color: var(--color-seafoam);
  border-color: var(--color-seafoam);
}
.cycle-tab-btn.active {
  background: var(--color-coral);
  color: #031720;
  border-color: var(--color-coral);
  box-shadow: 0 2px 10px rgba(255, 133, 109, 0.4);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 980px;
  text-align: left;
}

.pricing-table th, .pricing-table td {
  padding: 16px 14px;
  border-bottom: 1px solid rgba(119, 224, 197, 0.1);
  vertical-align: middle;
}

.pricing-table th {
  background-color: rgba(11, 66, 91, 0.85);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--color-seafoam);
  text-transform: uppercase;
}
.pricing-table th.th-annual {
  color: var(--color-coral);
}

.pricing-table tbody tr {
  transition: background-color var(--transition-fast);
}
.pricing-table tbody tr:hover {
  background-color: rgba(119, 224, 197, 0.04);
}

.pricing-table tr.highlight-plan {
  background-color: rgba(119, 224, 197, 0.08);
  border-left: 4px solid var(--color-coral);
}
.pricing-table tr.highlight-plan:hover {
  background-color: rgba(119, 224, 197, 0.12);
}

.plan-name-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.plan-main-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-pearl);
  font-family: var(--font-sans);
}
.plan-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--color-coral);
  background: rgba(255, 133, 109, 0.15);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  width: fit-content;
  border: 1px solid rgba(255, 133, 109, 0.3);
  letter-spacing: normal;
}

.price-col {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-pearl);
  white-space: nowrap;
}
.price-col.annual-col {
  color: var(--color-coral);
  font-weight: 800;
}
.price-col .price-sub {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--color-seafoam);
  display: block;
}

.plan-feature-tag {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--color-seafoam);
  background: rgba(119, 224, 197, 0.1);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
}

/* ==========================================================================
   Section: Submarine 3-Lane Mini-Game (Optional & Clearly Labeled Demo)
   ========================================================================== */
.section-game {
  padding: 80px 0;
  background-color: var(--color-deep-ocean);
  position: relative;
  border-bottom: 1px solid var(--color-border);
}

.game-card-wrapper {
  background: radial-gradient(ellipse at 50% 50%, rgba(11, 66, 91, 0.6) 0%, rgba(3, 23, 32, 0.9) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  max-width: 860px;
  margin: 0 auto;
}

.game-disclaimer-banner {
  background: rgba(255, 133, 109, 0.12);
  border: 1px solid rgba(255, 133, 109, 0.35);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  margin-bottom: 20px;
  font-size: 0.84rem;
  color: var(--color-pearl);
  display: flex;
  align-items: center;
  gap: 10px;
}
.game-disclaimer-banner strong {
  color: var(--color-coral);
}

.game-status-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(119, 224, 197, 0.15);
}

.game-scores-group {
  display: flex;
  gap: 16px;
  font-family: var(--font-mono);
}
.score-badge {
  background: rgba(6, 44, 60, 0.8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  font-size: 0.86rem;
}
.score-badge .score-label {
  color: var(--color-coral);
  margin-right: 6px;
}
.score-badge .score-val {
  color: var(--color-seafoam);
  font-weight: 700;
}

.game-controls-actions {
  display: flex;
  gap: 8px;
}

.game-canvas-container {
  position: relative;
  width: 100%;
  height: 280px;
  background-color: #03141C;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.7);
}

#submarineGameCanvas {
  display: block;
  width: 100%;
  height: 100%;
}

.game-touch-controls {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 18px;
}
.game-touch-btn {
  background: rgba(11, 66, 91, 0.8);
  border: 1px solid var(--color-seafoam);
  color: var(--color-pearl);
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  transition: all var(--transition-fast);
}
.game-touch-btn:hover, .game-touch-btn:active {
  background: var(--color-seafoam);
  color: #031720;
}

.game-hint-text {
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-pearl-dark);
  font-family: var(--font-mono);
  margin-top: 12px;
}

/* ==========================================================================
   Section 5: Nine Illustrated Articles (3x3 Desktop, 2 Tab, 1 Mob)
   ========================================================================== */
.section-articles {
  padding: 90px 0;
  background-color: var(--color-deep-ocean);
  position: relative;
}

.articles-grid-9 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

@media (min-width: 680px) {
  .articles-grid-9 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .articles-grid-9 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.article-card-item {
  background: rgba(11, 66, 91, 0.35);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
}
.article-card-item:hover {
  transform: translateY(-5px);
  border-color: var(--color-seafoam);
  box-shadow: 0 10px 24px rgba(3, 23, 32, 0.6), 0 0 16px rgba(119, 224, 197, 0.15);
}

.article-visual-header {
  height: 130px;
  background: linear-gradient(135deg, rgba(16, 85, 116, 0.6) 0%, rgba(3, 23, 32, 0.8) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid rgba(119, 224, 197, 0.12);
  position: relative;
  overflow: hidden;
}
.article-visual-header svg {
  width: 60px;
  height: 60px;
  stroke: var(--color-seafoam);
  transition: transform var(--transition-normal);
}
.article-card-item:hover .article-visual-header svg {
  transform: scale(1.1);
  stroke: var(--color-coral);
}
.article-badge-category {
  position: absolute;
  top: 10px;
  left: 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: rgba(6, 44, 60, 0.85);
  color: var(--color-coral);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 133, 109, 0.3);
}

.article-card-content {
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  color: var(--color-pearl-dark);
  font-family: var(--font-mono);
  margin-bottom: 10px;
}

.article-title-link {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-pearl);
  line-height: 1.4;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-card-item:hover .article-title-link {
  color: var(--color-seafoam);
}

.article-card-excerpt {
  font-size: 0.9rem;
  color: var(--color-pearl-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid rgba(119, 224, 197, 0.08);
  margin-top: auto;
}
.read-more-link {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--color-seafoam);
  display: flex;
  align-items: center;
  gap: 4px;
}
.read-more-link:hover {
  color: var(--color-coral);
}

/* ==========================================================================
   Section 6: Testimonials / User Scenarios (Illustrative Reference)
   ========================================================================== */
.section-testimonials {
  padding: 90px 0;
  background: linear-gradient(180deg, var(--color-deep-ocean) 0%, var(--color-abyss) 100%);
  border-top: 1px solid var(--color-border);
  position: relative;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 20px;
}

.testimonial-card {
  background: rgba(11, 66, 91, 0.35);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
}
.testimonial-card-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--color-seafoam);
  background: rgba(119, 224, 197, 0.1);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  width: fit-content;
  margin-bottom: 12px;
}
.testimonial-quote {
  font-size: 0.94rem;
  color: var(--color-pearl-muted);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid rgba(119, 224, 197, 0.1);
}
.author-avatar-depth {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(119, 224, 197, 0.15);
  border: 1px solid var(--color-seafoam);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-seafoam);
  font-size: 0.85rem;
}
.author-info {
  display: flex;
  flex-direction: column;
}
.author-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-pearl);
}
.author-role {
  font-size: 0.78rem;
  color: var(--color-pearl-dark);
}

/* ==========================================================================
   Section 7: Accordion FAQ
   ========================================================================== */
.section-faq {
  padding: 90px 0;
  background-color: var(--color-deep-ocean);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.faq-accordion-container {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: rgba(11, 66, 91, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}
.faq-item:hover {
  border-color: rgba(119, 224, 197, 0.4);
}
.faq-item.active {
  border-color: var(--color-seafoam);
}

.faq-question-btn {
  width: 100%;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  border: none;
  color: var(--color-pearl);
  font-size: 1.05rem;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  gap: 16px;
  transition: color var(--transition-fast);
}
.faq-question-btn:hover {
  color: var(--color-seafoam);
}

.faq-icon-cross {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  position: relative;
  transition: transform var(--transition-normal);
  color: var(--color-seafoam);
}
.faq-item.active .faq-icon-cross {
  transform: rotate(45deg);
  color: var(--color-coral);
}

.faq-answer-pane {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-normal);
  padding: 0 22px;
}
.faq-item.active .faq-answer-pane {
  padding: 0 22px 20px 22px;
}

.faq-answer-content {
  font-size: 0.95rem;
  color: var(--color-pearl-muted);
  line-height: 1.7;
}
.faq-answer-content p {
  margin-bottom: 10px;
}
.faq-answer-content p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Section: Global Commercial Floating CTA Banner
   ========================================================================== */
.section-cta-banner {
  padding: 60px 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(16, 85, 116, 0.7) 0%, rgba(3, 23, 32, 0.95) 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}
.cta-banner-box {
  max-width: 780px;
  margin: 0 auto;
}
.cta-banner-title {
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  font-weight: 800;
  color: var(--color-pearl);
  margin-bottom: 14px;
}
.cta-banner-desc {
  font-size: 1.05rem;
  color: var(--color-pearl-muted);
  margin-bottom: 28px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-abyss);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px 0;
  margin-top: auto;
  font-size: 0.9rem;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 36px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-pearl);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-col h4::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-seafoam);
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links-list a {
  color: var(--color-pearl-muted);
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: inline-block;
}
.footer-links-list a:hover {
  color: var(--color-seafoam);
  transform: translateX(4px);
}

/* Partner Recommendations Section */
.footer-recommendations {
  background: rgba(6, 44, 60, 0.4);
  border: 1px solid rgba(119, 224, 197, 0.12);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 30px;
}
.footer-rec-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-coral);
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}
.footer-rec-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-rec-link {
  color: var(--color-pearl-muted);
  font-size: 0.88rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.footer-rec-link:hover {
  color: var(--color-seafoam);
  text-decoration: underline;
}

.footer-bottom-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid rgba(119, 224, 197, 0.08);
  font-size: 0.82rem;
  color: var(--color-pearl-dark);
}
.footer-legal-links {
  display: flex;
  gap: 16px;
}

/* ==========================================================================
   Article Pages Template & Substantive Inner Pages
   ========================================================================== */
.article-page-header {
  padding: 60px 0 40px 0;
  background: linear-gradient(180deg, #09374C 0%, #062C3C 100%);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--color-pearl-dark);
  margin-bottom: 20px;
}
.breadcrumb-nav a {
  color: var(--color-seafoam);
}
.breadcrumb-nav a:hover {
  text-decoration: underline;
}
.breadcrumb-sep {
  color: var(--color-pearl-dark);
  opacity: 0.6;
}

.article-main-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--color-pearl);
  line-height: 1.25;
  margin-bottom: 18px;
}

.article-post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  font-size: 0.86rem;
  font-family: var(--font-mono);
  color: var(--color-pearl-dark);
}
.article-post-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-layout-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding: 60px 0;
}

@media (min-width: 980px) {
  .article-layout-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
  }
}

.article-body-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-pearl-muted);
}

.article-body-content h2 {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--color-pearl);
  margin: 42px 0 16px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(119, 224, 197, 0.2);
  display: flex;
  align-items: center;
  gap: 10px;
}
.article-body-content h2::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 24px;
  background-color: var(--color-coral);
  border-radius: var(--radius-sm);
}

.article-body-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-seafoam);
  margin: 28px 0 12px 0;
}

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

.article-body-content ul, .article-body-content ol {
  margin-bottom: 22px;
  padding-left: 24px;
}
.article-body-content ul {
  list-style: disc;
}
.article-body-content ol {
  list-style: decimal;
}
.article-body-content li {
  margin-bottom: 8px;
}

.article-callout-box {
  background: rgba(11, 66, 91, 0.45);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-seafoam);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin: 28px 0;
}
.article-callout-box.coral {
  border-left-color: var(--color-coral);
  background: rgba(255, 133, 109, 0.08);
}
.callout-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-pearl);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-inline-cta {
  background: radial-gradient(ellipse at center, rgba(16, 85, 116, 0.8) 0%, rgba(6, 44, 60, 0.95) 100%);
  border: 1px solid var(--color-seafoam);
  border-radius: var(--radius-lg);
  padding: 30px;
  text-align: center;
  margin: 40px 0;
  box-shadow: 0 8px 30px rgba(3, 23, 32, 0.5);
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  background: rgba(11, 66, 91, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 22px;
}
.sidebar-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-pearl);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(119, 224, 197, 0.15);
}

.related-articles-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.related-article-link {
  font-size: 0.92rem;
  color: var(--color-pearl-muted);
  line-height: 1.45;
  display: block;
}
.related-article-link:hover {
  color: var(--color-seafoam);
}

/* ==========================================================================
   Responsive Breakpoints & Mobile Nav
   ========================================================================== */
@media (max-width: 900px) {
  .hamburger-btn {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 74px;
    left: 0;
    width: 100%;
    height: calc(100vh - 74px);
    background-color: rgba(3, 23, 32, 0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: flex-start;
    padding: 30px 24px;
    gap: 20px;
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    overflow-y: auto;
    border-top: 1px solid var(--color-border);
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-link {
    font-size: 1.15rem;
    width: 100%;
    padding: 10px 0;
    border-bottom: 1px solid rgba(119, 224, 197, 0.08);
  }

  .nav-actions {
    display: none;
  }

  .nav-actions.mobile-only {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin-top: 16px;
  }
}

/* Reduced Motion Mode */
@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;
  }
}

/* Keyframes */
@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}