/* ==========================================================================
   BOOSTNET FIBERLINE COMMAND DESIGN SYSTEM
   Theme: FIBERLINE COMMAND - IEPL Private Line & Precision Network
   ========================================================================== */

:root {
  --bg-main: #07111F;
  --bg-secondary: #0D1D32;
  --bg-surface: #11243D;
  --bg-surface-2: #162B46;
  --text-main: #FFFFFF;
  --text-body: #C5D0DE;
  --text-secondary: #8FA4BC;
  --fiber-blue: #4D8DFF;
  --transit-cyan: #45D7C5;
  --signal-green: #62D9A7;
  --border-color: rgba(143, 164, 188, 0.18);
  --border-active: rgba(77, 141, 255, 0.4);
  --glow-blue: rgba(77, 141, 255, 0.15);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  --container-max: 1200px;
  --content-max: 820px;
  --header-height: 68px;
}

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

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

body {
  background-color: var(--bg-main);
  color: var(--text-body);
  font-family: var(--font-sans);
  line-height: 1.7;
  font-weight: 400;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(77, 141, 255, 0.08) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg-main) 0%, var(--bg-secondary) 50%, var(--bg-main) 100%);
  background-attachment: fixed;
}

/* Typography Base */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

p {
  margin-bottom: 1.25rem;
}

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

a:hover {
  color: var(--transit-cyan);
}

code, pre {
  font-family: var(--font-mono);
}

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

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

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

/* ==========================================================================
   HEADER: FIBER COMMAND BAR
   ========================================================================== */
.command-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: rgba(7, 17, 31, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(77, 141, 255, 0.25);
  display: flex;
  align-items: center;
}

.command-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-indicator {
  width: 10px;
  height: 10px;
  background-color: var(--transit-cyan);
  box-shadow: 0 0 8px var(--transit-cyan);
  border-radius: 2px;
}

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

.brand-title {
  color: var(--text-main);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
  line-height: 1.1;
}

.brand-subtitle {
  color: var(--fiber-blue);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  font-family: var(--font-sans);
}

.nav-routes {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  list-style: none;
}

.nav-link {
  color: var(--text-body);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  font-family: var(--font-sans);
  position: relative;
  padding: 0.25rem 0;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--transit-cyan);
  transition: width 0.2s ease;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.network-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--secondary);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.network-badge::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--signal-green);
  border-radius: 50%;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--fiber-blue), #2b6de5);
  color: #FFFFFF !important;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.55rem 1.25rem;
  border-radius: 3px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-cta:hover {
  background: linear-gradient(135deg, #3d7ee8, var(--fiber-blue));
  box-shadow: 0 0 15px rgba(77, 141, 255, 0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: rgba(17, 36, 61, 0.8);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.55rem 1.2rem;
  border-radius: 3px;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background-color: var(--bg-surface-2);
  border-color: var(--fiber-blue);
  color: var(--transit-cyan);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.4rem 0.75rem;
  border-radius: 3px;
  cursor: pointer;
}

/* Mobile Nav Drawer */
.mobile-nav-panel {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(7, 17, 31, 0.98);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
  overflow-y: auto;
  z-index: 999;
}

.mobile-nav-panel.open {
  display: block;
}

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

.mobile-nav-link {
  display: block;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border-color);
}

.mobile-nav-link:hover {
  color: var(--transit-cyan);
  padding-left: 0.5rem;
}

/* ==========================================================================
   HERO: FIBER CONVERGENCE HERO
   ========================================================================== */
.hero-convergence {
  padding-top: 3rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.hero-meta-tag {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fiber-blue);
  letter-spacing: 0.15em;
  margin-bottom: 0.5rem;
}

.hero-meta-tag::before {
  content: "";
  width: 24px;
  height: 1px;
  background-color: var(--fiber-blue);
}

.hero-protocol-bar {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--transit-cyan);
  letter-spacing: 0.18em;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

.hero-heading {
  margin-bottom: 1rem;
}

.hero-brand-name {
  display: block;
  font-size: clamp(2.25rem, 5vw, 3.8rem);
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.hero-main-slogan {
  display: block;
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  font-weight: 600;
  color: var(--fiber-blue);
  line-height: 1.15;
  margin-top: 0.25rem;
}

.hero-subheading {
  font-size: clamp(1.1rem, 2vw, 1.45rem);
  color: var(--transit-cyan);
  font-weight: 500;
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

.hero-summary-copy {
  max-width: 760px;
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.hero-actions-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.75rem;
}

/* Three-Network Convergence SVG Diagram */
.convergence-diagram-wrapper {
  background-color: rgba(13, 29, 50, 0.7);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}

.diagram-header-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.6rem;
  margin-bottom: 1rem;
}

.convergence-svg {
  width: 100%;
  height: auto;
  max-height: 240px;
  display: block;
}

/* ==========================================================================
   SECTIONS & TECHNICAL LABELS
   ========================================================================== */
.section-block {
  padding-top: 4.5rem;
  padding-bottom: 4.5rem;
  border-bottom: 1px solid var(--border-color);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fiber-blue);
  letter-spacing: 0.15em;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.section-label::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--transit-cyan);
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  margin-bottom: 1.25rem;
  color: var(--text-main);
}

.section-lead {
  font-size: 1.05rem;
  color: var(--text-body);
  max-width: 840px;
  line-height: 1.8;
  margin-bottom: 2rem;
}

/* 01 Three-Network Layout */
.three-network-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.operator-node {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1.25rem;
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.operator-node:hover {
  border-color: var(--fiber-blue);
  transform: translateY(-2px);
}

.operator-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--transit-cyan);
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
}

.operator-name {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.operator-desc {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 0;
}

.flow-convergence-box {
  background-color: rgba(17, 36, 61, 0.5);
  border: 1px solid rgba(77, 141, 255, 0.3);
  border-radius: 4px;
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.core-badge {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-main);
  background: var(--bg-secondary);
  border: 1px solid var(--fiber-blue);
  padding: 0.4rem 0.8rem;
  border-radius: 3px;
}

/* 02 Line Architecture */
.architecture-path {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin: 2rem 0;
  padding: 1.5rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow-x: auto;
}

.arch-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-width: 140px;
}

.arch-step-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--fiber-blue);
  margin-bottom: 0.25rem;
}

.arch-step-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

.arch-step-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.arch-arrow {
  color: var(--transit-cyan);
  font-size: 1.25rem;
  font-weight: 300;
}

.warning-callout {
  background-color: rgba(13, 29, 50, 0.85);
  border-left: 3px solid var(--transit-cyan);
  padding: 1.25rem;
  border-radius: 0 4px 4px 0;
  margin: 1.5rem 0;
}

.warning-callout-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--transit-cyan);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.warning-callout p {
  font-size: 0.9rem;
  margin-bottom: 0;
  color: var(--text-body);
}

/* 03 AnyTLS Protocol Path */
.protocol-path-container {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.protocol-strip {
  display: flex;
  align-items: center;
  justify-content: space-around;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.proto-node {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  color: var(--text-main);
}

.proto-node.active-proto {
  border-color: var(--transit-cyan);
  box-shadow: 0 0 10px rgba(69, 215, 197, 0.2);
}

/* 04 Long-Term Observation */
.observation-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.obs-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1.5rem;
  position: relative;
}

.obs-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fiber-blue);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.obs-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.obs-body {
  font-size: 0.9rem;
  color: var(--text-body);
  line-height: 1.65;
  margin-bottom: 0;
}

/* 05 Client Comparison */
.client-compare-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.client-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1.75rem;
}

.client-box.recommended {
  border-color: var(--transit-cyan);
  background: linear-gradient(180deg, rgba(69, 215, 197, 0.05) 0%, var(--bg-surface) 100%);
}

.client-badge-status {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  margin-bottom: 0.75rem;
}

.status-rec {
  background-color: rgba(69, 215, 197, 0.15);
  color: var(--transit-cyan);
  border: 1px solid var(--transit-cyan);
}

.status-var {
  background-color: rgba(143, 164, 188, 0.15);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.client-title {
  font-size: 1.15rem;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

/* 06 AI / Streaming Fiber Lines */
.parallel-fiber-system {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin: 2rem 0;
}

.fiber-line-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.fiber-line-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.fiber-line-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fiber-blue);
  letter-spacing: 0.1em;
}

.fiber-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-body);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.6rem;
  border-radius: 2px;
}

/* 07 FIBERLINE PRICING DECK - 4-Tier System */
.pricing-decision-guide {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.6rem 0.8rem;
  background-color: rgba(17, 36, 61, 0.5);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.65rem 1.25rem;
  margin: 1.5rem 0 1.25rem 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.decision-guide-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.decision-guide-tag {
  color: var(--text-secondary);
}

.decision-guide-arrow {
  color: var(--transit-cyan);
  font-size: 0.75rem;
}

.decision-guide-target {
  color: var(--text-main);
  font-weight: 500;
}

.decision-guide-target.highlight {
  color: var(--transit-cyan);
  font-weight: 600;
}

.decision-guide-divider {
  color: rgba(143, 164, 188, 0.3);
  margin: 0 0.2rem;
}

/* Fiber Plan Line (Desktop Connecting Topology) */
.fiber-plan-line-strip {
  position: relative;
  margin: 1.5rem 0 2rem 0;
  display: block;
}

.fiber-line-track {
  position: absolute;
  top: 9px;
  left: 6%;
  right: 6%;
  height: 2px;
  background: linear-gradient(90deg, 
    rgba(77, 141, 255, 0.2) 0%, 
    rgba(77, 141, 255, 0.35) 40%, 
    var(--transit-cyan) 65%, 
    rgba(77, 141, 255, 0.2) 100%
  );
  z-index: 1;
}

.fiber-line-points {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  z-index: 2;
  text-align: center;
}

.fiber-line-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.node-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--bg-surface);
  border: 2px solid var(--border-color);
  box-shadow: 0 0 0 3px var(--bg-main);
  transition: all 0.3s ease;
}

.node-dot.glow {
  background-color: var(--transit-cyan);
  border-color: #FFFFFF;
  box-shadow: 0 0 0 3px var(--bg-main), 0 0 12px rgba(69, 215, 197, 0.8);
}

.node-id {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
}

.node-name {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-body);
}

.fiber-line-node.active-rec .node-id {
  color: var(--transit-cyan);
  font-weight: 600;
}

.fiber-line-node.active-rec .node-name {
  color: #FFFFFF;
  font-weight: 600;
}

/* Pricing Deck Grid */
.pricing-deck-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  align-items: stretch;
  margin-bottom: 1.75rem;
}

/* Base Plan Card */
.plan-deck-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.plan-deck-card:hover {
  border-color: rgba(77, 141, 255, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(7, 17, 31, 0.6);
}

.plan-card-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
}

.plan-node-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.plan-card-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

/* Price Wrap */
.plan-price-wrap {
  margin-bottom: 1rem;
  min-height: 72px;
}

.plan-price-row {
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
  line-height: 1;
  margin-bottom: 0.4rem;
}

.plan-currency {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-main);
}

.plan-amount {
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--text-main);
  font-family: var(--font-mono);
  line-height: 1;
  letter-spacing: -0.03em;
}

.plan-cycle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  margin-left: 0.2rem;
}

.plan-sub-price {
  font-size: 0.8rem;
  color: var(--transit-cyan);
  font-family: var(--font-mono);
  font-weight: 500;
}

/* Traffic Wrap */
.plan-traffic-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  background-color: rgba(13, 29, 50, 0.85);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.45rem 0.75rem;
  margin-bottom: 1.25rem;
}

.plan-traffic-val {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1;
}

.plan-traffic-unit {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* Scene List */
.plan-scene-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.plan-scene-list li {
  font-size: 0.85rem;
  color: var(--text-body);
  display: flex;
  align-items: flex-start;
  gap: 0.45rem;
  line-height: 1.45;
}

.plan-scene-list li::before {
  content: "—";
  color: var(--text-secondary);
  font-family: var(--font-mono);
  flex-shrink: 0;
}

/* Card Button */
.plan-card-footer {
  margin-top: auto;
}

.plan-card-btn {
  width: 100%;
  padding: 0.65rem 1rem;
  font-size: 0.84rem;
  text-align: center;
}

/* 推荐套餐 - 03 标准套餐 (视觉焦点 1+2+1 层级突出) */
.plan-deck-card.recommended {
  background: linear-gradient(180deg, rgba(77, 141, 255, 0.12) 0%, rgba(17, 36, 61, 0.98) 100%);
  border: 1.5px solid var(--fiber-blue);
  box-shadow: 0 0 20px rgba(77, 141, 255, 0.2), 0 8px 30px rgba(7, 17, 31, 0.7);
  position: relative;
  z-index: 3;
}

@media (min-width: 1024px) {
  .plan-deck-card.recommended {
    transform: translateY(-8px);
    padding: 1.75rem 1.35rem;
  }
  .plan-deck-card.recommended:hover {
    transform: translateY(-12px);
    box-shadow: 0 0 25px rgba(77, 141, 255, 0.35), 0 12px 35px rgba(7, 17, 31, 0.8);
  }
}

.plan-rec-badge-wrap {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
}

.plan-badge-rec {
  display: inline-block;
  background: linear-gradient(135deg, var(--fiber-blue), var(--transit-cyan));
  color: #07111F;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.85rem;
  border-radius: 12px;
  letter-spacing: 0.05em;
  box-shadow: 0 2px 8px rgba(69, 215, 197, 0.4);
}

.plan-deck-card.recommended .plan-card-header {
  border-bottom-color: rgba(77, 141, 255, 0.35);
}

.plan-node-code.highlight {
  color: var(--transit-cyan);
}

.plan-card-title.highlight {
  color: #FFFFFF;
}

.plan-currency.highlight {
  color: var(--transit-cyan);
}

.plan-amount.highlight {
  color: #FFFFFF;
  text-shadow: 0 0 15px rgba(77, 141, 255, 0.4);
}

.plan-cycle.highlight {
  color: var(--transit-cyan);
}

.plan-sub-price.highlight {
  color: var(--transit-cyan);
  font-weight: 600;
}

.plan-traffic-wrap.highlight {
  background-color: rgba(77, 141, 255, 0.15);
  border-color: rgba(69, 215, 197, 0.4);
}

.plan-traffic-val.highlight {
  color: var(--transit-cyan);
}

.plan-traffic-unit.highlight {
  color: #FFFFFF;
}

.plan-scene-list.highlight li::before {
  color: var(--transit-cyan);
}

.plan-card-btn.highlight {
  background: linear-gradient(135deg, var(--transit-cyan), var(--fiber-blue));
  color: #07111F !important;
  font-weight: 700;
  border: none;
  box-shadow: 0 0 15px rgba(69, 215, 197, 0.3);
}

.plan-card-btn.highlight:hover {
  background: linear-gradient(135deg, #5df3e0, #619aff);
  box-shadow: 0 0 20px rgba(69, 215, 197, 0.5);
  transform: translateY(-1px);
}

/* 全系网络特点栏 */
.unified-network-features {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  background-color: rgba(17, 36, 61, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.85rem 1.25rem;
  margin-bottom: 1.25rem;
}

.unified-feat-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.unified-feat-items {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

.feat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-main);
}

.feat-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--transit-cyan);
  display: inline-block;
}

/* 底部选型辅助栏 */
.plan-decision-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--transit-cyan);
  border-radius: 0 4px 4px 0;
  padding: 1.1rem 1.35rem;
}

.decision-bottom-text {
  flex: 1 1 500px;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-body);
}

.decision-bottom-text strong {
  color: var(--transit-cyan);
  margin-right: 0.5rem;
}

.decision-bottom-btn {
  flex-shrink: 0;
}

/* 平板适配 (768px - 1023px) */
@media (max-width: 1023px) and (min-width: 768px) {
  .pricing-deck-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
  .plan-deck-card.recommended {
    transform: none;
  }
  .plan-deck-card.recommended:hover {
    transform: translateY(-2px);
  }
}

/* 移动端适配 (< 768px: 375px, 390px, 430px) */
@media (max-width: 767px) {
  .fiber-plan-line-strip {
    display: none;
  }
  
  .pricing-decision-guide {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  .decision-guide-divider {
    display: none;
  }

  .pricing-deck-grid {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
  }

  /* 移动端顺序：1. 标准套餐 (推荐) -> 2. 年付轻量 -> 3. 入门套餐 -> 4. 大流量套餐 */
  .plan-deck-card.recommended {
    order: 1;
    transform: none;
    margin-top: 10px;
  }
  .plan-deck-card.plan-annual {
    order: 2;
  }
  .plan-deck-card.plan-entry {
    order: 3;
  }
  .plan-deck-card.plan-large {
    order: 4;
  }

  .plan-deck-card {
    padding: 1.25rem;
    min-height: auto;
  }

  .plan-price-wrap {
    min-height: auto;
  }

  .unified-network-features {
    flex-direction: column;
    align-items: flex-start;
  }

  .plan-decision-bottom-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .decision-bottom-btn {
    width: 100%;
  }
}

.historical-note-tip {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.75rem;
  opacity: 0.85;
}

/* 08 BoostNet Review Excerpt Section */
.review-excerpt-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--fiber-blue);
  border-radius: 0 4px 4px 0;
  padding: 2rem;
  margin: 2rem 0;
}

.review-excerpt-card blockquote {
  font-size: 1.05rem;
  color: var(--text-main);
  line-height: 1.85;
  margin-bottom: 1.25rem;
}

/* 09 Route Documents: Knowledge Base */
.route-documents-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 2rem 0;
}

.route-doc-item {
  display: grid;
  grid-template-columns: 80px 1fr 140px 100px;
  align-items: center;
  gap: 1.25rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 1.1rem 1.5rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.route-doc-item:hover {
  border-color: var(--fiber-blue);
  background-color: var(--bg-surface-2);
  transform: translateX(4px);
}

.doc-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fiber-blue);
}

.doc-center {
  display: flex;
  flex-direction: column;
}

.doc-title {
  font-size: 1.02rem;
  color: var(--text-main);
  font-weight: 500;
  margin-bottom: 0.2rem;
}

.doc-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.doc-category {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--transit-cyan);
  text-align: right;
}

.doc-arrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--fiber-blue);
  text-align: right;
}

/* 10 Network Query FAQ */
.faq-line-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 2rem 0;
}

.faq-line-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  overflow: hidden;
}

.faq-toggle {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: 1.2rem 1.5rem;
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-family: inherit;
}

.faq-q-text {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.faq-idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fiber-blue);
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--fiber-blue);
  transition: transform 0.2s ease;
}

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

.faq-answer-panel {
  display: none;
  padding: 0 1.5rem 1.25rem 1.5rem;
  color: var(--text-body);
  font-size: 0.92rem;
  line-height: 1.7;
  border-top: 1px solid rgba(143, 164, 188, 0.08);
  margin-top: 0.25rem;
  padding-top: 1rem;
}

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

/* ==========================================================================
   FOOTER: COMPACT FIBERLINE FOOTER (250px - 320px)
   ========================================================================== */
.site-footer {
  background-color: var(--bg-main);
  border-top: 1px solid var(--border-color);
  padding-top: 2.5rem;
  padding-bottom: 2rem;
  color: var(--text-secondary);
}

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

.footer-brand-title {
  color: var(--text-main);
  font-size: 1.1rem;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
}

.footer-brand-sub {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--fiber-blue);
  letter-spacing: 0.15em;
  margin-bottom: 0.75rem;
}

.footer-brand-desc {
  font-size: 0.85rem;
  line-height: 1.6;
  max-width: 320px;
  margin-bottom: 1rem;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-main);
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-link {
  color: var(--text-secondary);
  font-size: 0.82rem;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--transit-cyan);
}

.footer-recommend-bar {
  border-top: 1px solid var(--border-color);
  padding-top: 1.25rem;
  margin-bottom: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  font-size: 0.8rem;
}

.footer-recommend-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--fiber-blue);
  letter-spacing: 0.1em;
}

.footer-bottom-row {
  border-top: 1px solid rgba(143, 164, 188, 0.08);
  padding-top: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ==========================================================================
   ARTICLE & CONTENT SYSTEM (PRIVATE LINE READER)
   ========================================================================== */
.article-header {
  padding-top: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2.5rem;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

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

.breadcrumb-nav a:hover {
  color: var(--transit-cyan);
}

.breadcrumb-separator {
  color: var(--fiber-blue);
}

.article-category-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--transit-cyan);
  background-color: rgba(69, 215, 197, 0.1);
  border: 1px solid rgba(69, 215, 197, 0.25);
  padding: 0.2rem 0.6rem;
  border-radius: 2px;
  margin-bottom: 1rem;
}

.article-main-title {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 1.25rem;
}

.article-lead {
  font-size: 1.12rem;
  line-height: 1.8;
  color: var(--text-body);
  margin-bottom: 1.5rem;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Quick Answer Box */
.quick-answer {
  background: linear-gradient(180deg, rgba(77, 141, 255, 0.08) 0%, rgba(17, 36, 61, 0.7) 100%);
  border: 1px solid var(--fiber-blue);
  border-radius: 4px;
  padding: 1.5rem;
  margin-bottom: 2.5rem;
}

.quick-answer h2 {
  font-size: 1.15rem;
  color: var(--fiber-blue);
  font-family: var(--font-mono);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quick-answer p {
  font-size: 1rem;
  color: var(--text-main);
  line-height: 1.75;
  margin-bottom: 0;
}

/* Table of Contents */
.article-toc {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--transit-cyan);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toc-link {
  font-size: 0.9rem;
  color: var(--text-body);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toc-link::before {
  content: "#";
  color: var(--fiber-blue);
  font-family: var(--font-mono);
}

.toc-link:hover {
  color: var(--transit-cyan);
  padding-left: 0.25rem;
}

/* Article Body Typography */
.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-body);
}

.article-content h2 {
  font-size: 1.65rem;
  color: var(--text-main);
  margin-top: 3rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.25rem;
  color: var(--text-main);
  margin-top: 2rem;
  margin-bottom: 0.85rem;
}

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

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

/* Tables in Articles */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
  background-color: var(--bg-surface);
}

.custom-table th {
  background-color: var(--bg-surface-2);
  color: var(--text-main);
  font-weight: 600;
  font-family: var(--font-mono);
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.custom-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid rgba(143, 164, 188, 0.1);
  color: var(--text-body);
}

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

.custom-table tr:hover td {
  background-color: rgba(77, 141, 255, 0.05);
}

/* Article In-text Callouts */
.article-callout {
  background-color: rgba(17, 36, 61, 0.8);
  border-left: 3px solid var(--fiber-blue);
  padding: 1.25rem;
  border-radius: 0 4px 4px 0;
  margin: 1.75rem 0;
}

.article-callout-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--fiber-blue);
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
}

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

/* Original Review User Quote Container */
.original-quote-box {
  background: linear-gradient(180deg, rgba(69, 215, 197, 0.08) 0%, var(--bg-surface) 100%);
  border: 1px solid var(--transit-cyan);
  border-radius: 4px;
  padding: 1.75rem;
  margin: 2.25rem 0;
}

.quote-header-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--transit-cyan);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.original-quote-box p {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.original-quote-box p:last-child {
  margin-bottom: 0;
}

/* Article CTA Box */
.article-cta-box {
  background-color: var(--bg-surface);
  border: 1px solid rgba(77, 141, 255, 0.35);
  border-radius: 4px;
  padding: 2rem;
  margin: 3.5rem 0 2rem 0;
  text-align: center;
}

.article-cta-title {
  font-size: 1.4rem;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.article-cta-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 1.5rem auto;
}

/* Category Page Specifics */
.category-header {
  padding: 3rem 0 2.5rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 3rem;
}

.category-lead {
  font-size: 1.05rem;
  color: var(--text-body);
  max-width: 800px;
  line-height: 1.8;
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES (375, 390, 430, 768, 1024, 1440)
   ========================================================================== */
@media (max-width: 1180px) and (min-width: 1025px) {
  .nav-routes {
    gap: 0.85rem;
  }
  .nav-link {
    font-size: 0.84rem;
  }
}

@media (max-width: 1024px) {
  .nav-routes {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .three-network-flow {
    grid-template-columns: 1fr;
  }
  .observation-grid {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
  .route-doc-item {
    grid-template-columns: 70px 1fr 100px;
  }
  .doc-arrow {
    display: none;
  }
}

@media (max-width: 768px) {
  .header-actions .network-badge {
    display: none;
  }
  .client-compare-strip {
    grid-template-columns: 1fr;
  }
  .architecture-path {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }
  .arch-arrow {
    text-align: center;
    transform: rotate(90deg);
  }
  .route-doc-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .doc-category {
    text-align: left;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom-row {
    flex-direction: column;
    align-items: flex-start;
  }
  .plan-main-row {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 430px) {
  :root {
    --header-height: 60px;
  }
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  .content-container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  .brand-subtitle {
    display: none;
  }
  .hero-brand-name {
    font-size: 2.2rem;
  }
  .hero-main-slogan {
    font-size: 1.8rem;
  }
  .hero-actions-row {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-cta, .btn-secondary {
    width: 100%;
    text-align: center;
  }
  .price-amount {
    font-size: 2.2rem;
  }
}

/* ==========================================================================
   ACCESSIBILITY: PREFERS-REDUCED-MOTION
   ========================================================================== */
@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;
  }
}