/* ==========================================================================
   ImmTelecom Official Stylesheet
   Swiss Modernist Telecom Portal Design System
   High-contrast architectural palette, hairline dividers, zero-lag micro-interactions
   ========================================================================== */

/* --- CSS Variables & Design Tokens --- */
:root {
  /* Architectural Swiss Palette */
  --canvas-bg: #ffffff;
  --surface-card: #ffffff;
  --surface-subtle: #f8fafc;
  --surface-elevated: #f1f5f9;
  
  /* Monolithic Slate & Telecom Azure */
  --slate-navy-hero: #1a2b3c;
  --slate-navy-dark: #121e2b;
  --slate-navy-light: #243b53;
  --telecom-azure: #0066ff;
  --telecom-azure-hover: #0052cc;
  --telecom-azure-glow: rgba(0, 102, 255, 0.2);
  --telecom-cyan: #00d2ff;

  /* Typography Colors */
  --text-graphite: #0f172a;
  --text-graphite-secondary: #334155;
  --text-graphite-muted: #64748b;
  --text-graphite-light: #94a3b8;
  --text-on-dark: #f8fafc;
  --text-on-dark-muted: #94a3b8;

  /* Precision Hairline Borders */
  --border-hairline: #e2e8f0;
  --border-hairline-dark: rgba(255, 255, 255, 0.12);
  --border-active: #0066ff;

  /* Shadows & Elevation */
  --shadow-flat: 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-hub: 0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-hub-hover: 0 14px 28px rgba(0, 102, 255, 0.16);
  --shadow-card-hover: 0 12px 24px rgba(15, 23, 42, 0.08);

  /* Layout & Spacing */
  --max-width: 1200px;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-pill: 9999px;

  /* Transitions */
  --transition-instant: 0.1s ease;
  --transition-smooth: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-theme: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Dark Theme Tokens */
[data-theme="dark"] {
  --canvas-bg: #0b1017;
  --surface-card: #121824;
  --surface-subtle: #162030;
  --surface-elevated: #1a2436;

  --slate-navy-hero: #0e1722;
  --slate-navy-dark: #080d14;
  --slate-navy-light: #182636;
  --telecom-azure: #2575fc;
  --telecom-azure-hover: #4388ff;
  --telecom-azure-glow: rgba(37, 117, 252, 0.28);
  --telecom-cyan: #38bdf8;

  --text-graphite: #f8fafc;
  --text-graphite-secondary: #cbd5e1;
  --text-graphite-muted: #94a3b8;
  --text-graphite-light: #64748b;
  --text-on-dark: #f8fafc;
  --text-on-dark-muted: #94a3b8;

  --border-hairline: #1e293b;
  --border-hairline-dark: rgba(255, 255, 255, 0.08);
  --border-active: #2575fc;

  --shadow-flat: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-hub: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-hub-hover: 0 16px 32px rgba(37, 117, 252, 0.22);
  --shadow-card-hover: 0 12px 28px rgba(0, 0, 0, 0.6);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "Arial", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--canvas-bg);
  color: var(--text-graphite);
  line-height: 1.6;
  transition: var(--transition-theme);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

/* --- Typography & Utilities --- */
.font-mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.text-azure {
  color: var(--telecom-azure);
}

.badge-carrier {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-radius: var(--radius-xs);
  background: rgba(0, 102, 255, 0.08);
  color: var(--telecom-azure);
  border: 1px solid rgba(0, 102, 255, 0.2);
}

.section-padding {
  padding: 84px 0;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 52px;
}

.section-subtitle-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--telecom-azure);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-graphite);
  line-height: 1.25;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-graphite-muted);
  line-height: 1.65;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition-smooth);
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  border: 1px solid transparent;
}

.btn-azure {
  background-color: var(--telecom-azure);
  color: #ffffff;
  border-color: var(--telecom-azure);
}

.btn-azure:hover {
  background-color: var(--telecom-azure-hover);
  border-color: var(--telecom-azure-hover);
  box-shadow: 0 4px 14px var(--telecom-azure-glow);
  color: #ffffff;
}

.btn-outline-white {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.4);
}

.btn-outline-white:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #ffffff;
  color: #ffffff;
}

.btn-secondary {
  background: var(--surface-card);
  color: var(--text-graphite);
  border-color: var(--border-hairline);
}

.btn-secondary:hover {
  border-color: var(--telecom-azure);
  color: var(--telecom-azure);
}

.btn-block {
  width: 100%;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
}

/* --- Top Brand Bar with Clean Modernist Layout & Precision Baseline Indicator --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--canvas-bg);
  border-bottom: 1px solid var(--border-hairline);
  transition: var(--transition-theme);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.brand-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}

/* Brand Identity & Logo */
.brand-identity {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand-logo-img {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  object-fit: cover;
  display: block;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.16);
  flex-shrink: 0;
}

.brand-name {
  font-size: 1.3rem;
  font-weight: 850;
  letter-spacing: -0.03em;
  color: var(--text-graphite);
  white-space: nowrap;
}

/* Modernist Hairline Navigation Menu */
.nav-hairline-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0 auto;
  flex-shrink: 0;
}

.nav-hairline-item {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-hairline-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-graphite-secondary);
  white-space: nowrap;
  border-radius: var(--radius-xs);
  position: relative;
  transition: all var(--transition-instant);
}

/* Rigorous Swiss Micro-interaction: Instantaneous 2px Cyan-Blue Baseline on hover */
.nav-hairline-link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 12px;
  right: 12px;
  height: 2px;
  background-color: var(--telecom-azure);
  opacity: 0;
  transform: scaleX(0);
  transition: transform var(--transition-instant), opacity var(--transition-instant);
  transform-origin: center;
}

.nav-hairline-link:hover {
  color: var(--telecom-azure);
  background: rgba(0, 102, 255, 0.05);
}

.nav-hairline-link:hover::after {
  opacity: 1;
  transform: scaleX(1);
}

.nav-badge-new {
  font-size: 0.65rem;
  background: #ef4444;
  color: #ffffff;
  padding: 1px 5px;
  border-radius: 3px;
  margin-left: 5px;
  font-weight: 700;
  line-height: 1.2;
}

/* Header Action Controls */
.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* Precision Swiss Theme Toggle Button */
.theme-toggle-swiss {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--surface-subtle);
  border: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-graphite);
  cursor: pointer;
  transition: all var(--transition-smooth);
  position: relative;
  flex-shrink: 0;
}

.theme-toggle-swiss:hover {
  border-color: var(--telecom-azure);
  color: var(--telecom-azure);
  background: var(--surface-elevated);
}

.theme-toggle-swiss svg {
  width: 19px;
  height: 19px;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.2s ease;
}

.theme-toggle-swiss .moon-icon {
  position: absolute;
  opacity: 0;
  transform: scale(0.6) rotate(-45deg);
}

.theme-toggle-swiss .sun-icon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

[data-theme="dark"] .theme-toggle-swiss .sun-icon {
  opacity: 0;
  transform: scale(0.6) rotate(45deg);
}

[data-theme="dark"] .theme-toggle-swiss .moon-icon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.mobile-menu-trigger {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  background: var(--surface-subtle);
  color: var(--text-graphite);
  cursor: pointer;
}

/* ==========================================================================
   Monolithic Slate Navy Hero Banner
   ========================================================================== */
.monolithic-hero-banner {
  background-color: var(--slate-navy-hero);
  color: #ffffff;
  padding: 68px 0 54px;
  position: relative;
  border-bottom: 1px solid var(--slate-navy-dark);
}

.hero-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 40px;
}

.hero-main-declaration {
  flex: 1;
  max-width: 860px;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-hairline-dark);
  border-radius: var(--radius-xs);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--telecom-cyan);
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

.hero-status-pill .indicator-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10b981;
}

.hero-headline-brand {
  font-size: clamp(2.2rem, 3.1vw, 2.9rem);
  font-weight: 850;
  line-height: 1.18;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  color: #ffffff;
  white-space: nowrap;
}

.hero-headline-brand span.azure-highlight {
  color: #00d2ff;
}

.hero-subhead-declaration {
  font-size: 1.45rem;
  font-weight: 700;
  color: #e2e8f0;
  margin-bottom: 14px;
  letter-spacing: -0.015em;
}

.hero-introduction-text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: #94a3b8;
  max-width: 700px;
  margin-bottom: 28px;
}

.hero-actions-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.hero-quick-specs {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px 24px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-hairline-dark);
  border-radius: var(--radius-sm);
  min-width: 260px;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
}

.spec-name {
  color: #94a3b8;
}

.spec-val {
  font-weight: 700;
  color: #ffffff;
}

/* ==========================================================================
   3-Column Action Hubs (Order, Billing, Support)
   Micro-interaction: Subtle 3D elevation and border illumination on mouse enter
   ========================================================================== */
.action-hubs-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 36px;
}

.action-hub-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-hairline-dark);
  border-radius: var(--radius-sm);
  padding: 24px 22px;
  color: #ffffff;
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

/* 3D elevation and border illumination */
.action-hub-card:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--telecom-azure);
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0, 102, 255, 0.25);
}

.hub-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.hub-number {
  font-size: 0.75rem;
  font-weight: 700;
  color: #00d2ff;
  letter-spacing: 1px;
}

.hub-icon-box {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-xs);
  background: rgba(0, 102, 255, 0.2);
  border: 1px solid rgba(0, 102, 255, 0.4);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hub-title {
  font-size: 1.15rem;
  font-weight: 750;
  margin-bottom: 8px;
  color: #ffffff;
}

.hub-desc {
  font-size: 0.88rem;
  color: #94a3b8;
  line-height: 1.55;
  margin-bottom: 18px;
  flex-grow: 1;
}

.hub-link-cta {
  font-size: 0.88rem;
  font-weight: 700;
  color: #00d2ff;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  transition: gap var(--transition-instant);
}

.action-hub-card:hover .hub-link-cta {
  gap: 10px;
  color: #ffffff;
}

/* ==========================================================================
   Chronological Announcement Feed
   Micro-interaction: Date badges invert from dark slate to vivid blue upon hover
   ========================================================================== */
.announcement-feed-wrapper {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-hairline-dark);
}

.feed-header-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.feed-title {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: #94a3b8;
  text-transform: uppercase;
}

.announcement-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  list-style: none;
}

.announcement-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-hairline-dark);
  border-radius: var(--radius-xs);
  transition: all var(--transition-instant);
}

.announcement-item:hover {
  background: rgba(0, 0, 0, 0.35);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Inversion Micro-interaction on Date Badge */
.announcement-date-badge {
  background-color: var(--slate-navy-dark);
  color: #94a3b8;
  padding: 4px 8px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 3px;
  border: 1px solid var(--border-hairline-dark);
  white-space: nowrap;
  transition: all var(--transition-instant);
}

.announcement-item:hover .announcement-date-badge {
  background-color: var(--telecom-azure);
  color: #ffffff;
  border-color: var(--telecom-azure);
}

.announcement-text {
  font-size: 0.86rem;
  color: #cbd5e1;
  font-weight: 500;
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.announcement-item:hover .announcement-text {
  color: #ffffff;
}

/* ==========================================================================
   Core Advantages Section (3 Functional Cards)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-carrier-card {
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 34px 28px;
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.feature-carrier-card:hover {
  border-color: var(--telecom-azure);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.carrier-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-xs);
  background: var(--surface-subtle);
  border: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--telecom-azure);
  margin-bottom: 22px;
}

.feature-carrier-card:hover .carrier-icon-wrap {
  background: var(--telecom-azure);
  color: #ffffff;
  border-color: var(--telecom-azure);
}

.feature-card-heading {
  font-size: 1.25rem;
  font-weight: 750;
  color: var(--text-graphite);
  margin-bottom: 12px;
}

.feature-card-body {
  font-size: 0.94rem;
  color: var(--text-graphite-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.feature-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--border-hairline);
  padding-top: 18px;
}

.feature-specs-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-graphite-secondary);
}

.feature-specs-list li svg {
  color: var(--telecom-azure);
  flex-shrink: 0;
}

/* ==========================================================================
   Streaming & AI Dual Showcase Cards
   ========================================================================== */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.showcase-carrier-card {
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 38px 34px;
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.showcase-carrier-card:hover {
  border-color: var(--telecom-azure);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
}

.showcase-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
  width: fit-content;
  padding: 4px 10px;
  border-radius: var(--radius-xs);
}

.tag-stream {
  background: rgba(239, 68, 68, 0.08);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.tag-ai {
  background: rgba(16, 185, 129, 0.08);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.showcase-headline {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-graphite);
  margin-bottom: 10px;
}

.showcase-body {
  font-size: 0.94rem;
  color: var(--text-graphite-muted);
  line-height: 1.65;
  margin-bottom: 24px;
}

.carrier-pills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

.carrier-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: var(--surface-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-graphite);
  transition: all var(--transition-instant);
}

.carrier-pill:hover {
  border-color: var(--telecom-azure);
  background: var(--surface-elevated);
}

.pill-marker {
  width: 20px;
  height: 20px;
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 800;
  color: #ffffff;
  flex-shrink: 0;
}

.pill-m-netflix { background: #e50914; }
.pill-m-disney { background: #0063e5; }
.pill-m-youtube { background: #ff0000; }
.pill-m-hbo { background: #5822b4; }
.pill-m-prime { background: #00a8e1; }
.pill-m-spotify { background: #1ed760; }

.pill-m-chatgpt { background: #10a37f; }
.pill-m-claude { background: #d97706; }
.pill-m-midjourney { background: #2b3137; }
.pill-m-gemini { background: #4285f4; }
.pill-m-copilot { background: #6e40c9; }
.pill-m-perplexity { background: #1f2937; }

.showcase-meta-points {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  padding-top: 18px;
  border-top: 1px solid var(--border-hairline);
}

.showcase-meta-points li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-graphite-secondary);
}

.showcase-meta-points svg {
  color: var(--telecom-azure);
  flex-shrink: 0;
}

/* ==========================================================================
   Pricing Table - Market Realistic Rates
   ========================================================================== */
.pricing-matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-column {
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-smooth);
}

.pricing-column:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-hairline);
}

.pricing-column.recommended {
  border: 2px solid var(--telecom-azure);
  box-shadow: var(--shadow-hub);
}

.pricing-column.recommended:hover {
  box-shadow: var(--shadow-hub-hover);
}

.rec-badge {
  position: absolute;
  top: -13px;
  left: 28px;
  background: var(--telecom-azure);
  color: #ffffff;
  padding: 3px 12px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-radius: 2px;
}

.plan-tier-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-graphite);
  margin-bottom: 6px;
}

.plan-tier-summary {
  font-size: 0.88rem;
  color: var(--text-graphite-muted);
  margin-bottom: 22px;
  min-height: 40px;
}

.plan-cost-display {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-hairline);
}

.cost-symbol {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-graphite);
}

.cost-number {
  font-size: 3rem;
  font-weight: 850;
  line-height: 1;
  color: var(--text-graphite);
  letter-spacing: -0.03em;
}

.cost-tenure {
  font-size: 0.88rem;
  color: var(--text-graphite-muted);
  font-weight: 500;
}

.plan-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.plan-checklist li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-graphite-secondary);
}

.plan-checklist li svg {
  color: var(--telecom-azure);
  flex-shrink: 0;
}

.plan-checklist li.omitted {
  color: var(--text-graphite-light);
  opacity: 0.5;
}

.plan-checklist li.omitted svg {
  color: var(--text-graphite-light);
}

/* ==========================================================================
   User Reviews & Testimonials
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-carrier-box {
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-smooth);
}

.review-carrier-box:hover {
  border-color: var(--border-active);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.review-rating-stars {
  display: flex;
  gap: 3px;
  color: #f59e0b;
  margin-bottom: 14px;
}

.review-quote-body {
  font-size: 0.94rem;
  color: var(--text-graphite-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.review-person-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-hairline);
}

.person-avatar-circle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-xs);
  background: var(--slate-navy-hero);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

.person-fullname {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-graphite);
}

.person-jobtitle {
  font-size: 0.8rem;
  color: var(--text-graphite-muted);
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-carrier-accordion {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-carrier-row {
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: all var(--transition-instant);
}

.faq-carrier-row:hover {
  border-color: var(--telecom-azure);
}

.faq-carrier-row[open] {
  border-color: var(--telecom-azure);
  box-shadow: var(--shadow-flat);
}

.faq-carrier-summary {
  padding: 18px 22px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-graphite);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-carrier-summary::-webkit-details-marker {
  display: none;
}

.faq-carrier-icon {
  width: 18px;
  height: 18px;
  transition: transform 0.25s ease;
  color: var(--text-graphite-muted);
  flex-shrink: 0;
}

.faq-carrier-row[open] .faq-carrier-icon {
  transform: rotate(180deg);
  color: var(--telecom-azure);
}

.faq-carrier-content {
  padding: 0 22px 20px;
  font-size: 0.94rem;
  color: var(--text-graphite-muted);
  line-height: 1.7;
}

/* ==========================================================================
   CTA Banner
   ========================================================================== */
.cta-slate-block {
  background-color: var(--slate-navy-hero);
  border-radius: var(--radius-sm);
  padding: 56px 40px;
  text-align: center;
  color: #ffffff;
  border: 1px solid var(--border-hairline-dark);
}

.cta-slate-block h2 {
  font-size: 2.15rem;
  font-weight: 850;
  margin-bottom: 14px;
}

.cta-slate-block p {
  font-size: 1.05rem;
  color: #94a3b8;
  max-width: 640px;
  margin: 0 auto 28px;
}

/* ==========================================================================
   Site Footer (Strictly 4 Links)
   ========================================================================== */
.site-footer-swiss {
  background-color: var(--canvas-bg);
  border-top: 1px solid var(--border-hairline);
  padding: 44px 0 34px;
  transition: var(--transition-theme);
}

.footer-nav-carrier {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-graphite-secondary);
  transition: color var(--transition-instant);
  padding: 4px 6px;
}

.footer-nav-link:hover {
  color: var(--telecom-azure);
}

.footer-legal-copy {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-graphite-light);
}

/* ==========================================================================
   Subpages & Insights Article Styles
   ========================================================================== */
.doc-carrier-page {
  max-width: 880px;
  margin: 0 auto;
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 44px;
  box-shadow: var(--shadow-flat);
}

.carrier-article-card {
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 28px 24px;
  margin-bottom: 20px;
  transition: all var(--transition-smooth);
}

.carrier-article-card:hover {
  border-color: var(--telecom-azure);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.carrier-article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 0.8rem;
}

.carrier-article-title {
  font-size: 1.35rem;
  font-weight: 750;
  margin-bottom: 10px;
  color: var(--text-graphite);
}

.carrier-article-title a:hover {
  color: var(--telecom-azure);
}

.carrier-article-excerpt {
  font-size: 0.94rem;
  color: var(--text-graphite-muted);
  line-height: 1.65;
  margin-bottom: 16px;
}

.carrier-article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-hairline);
  padding-top: 14px;
  font-size: 0.85rem;
  color: var(--telecom-azure);
  font-weight: 600;
}

/* ==========================================================================
   Full Article Page Styles (SEO Deep Read)
   ========================================================================== */
.breadcrumb-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-graphite-muted);
  margin-bottom: 24px;
}

.breadcrumb-bar a {
  color: var(--text-graphite-secondary);
  transition: color var(--transition-instant);
}

.breadcrumb-bar a:hover {
  color: var(--telecom-azure);
}

.breadcrumb-sep {
  color: var(--text-graphite-light);
}

.article-hero-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-hairline);
}

.article-main-title {
  font-size: 2.2rem;
  font-weight: 850;
  line-height: 1.25;
  color: var(--text-graphite);
  margin-bottom: 16px;
  letter-spacing: -0.025em;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-graphite-muted);
  flex-wrap: wrap;
}

/* Table of Contents Box (目录) */
.article-toc-box {
  background: var(--surface-subtle);
  border: 1px solid var(--border-hairline);
  border-left: 4px solid var(--telecom-azure);
  border-radius: var(--radius-xs);
  padding: 22px 26px;
  margin: 28px 0 36px;
}

.article-toc-title {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--text-graphite);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-toc-list li a {
  font-size: 0.92rem;
  color: var(--text-graphite-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition-instant);
}

.article-toc-list li a:hover {
  color: var(--telecom-azure);
  text-decoration: underline;
}

/* Article Content Typography */
.article-rich-body {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-graphite-secondary);
}

.article-rich-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-graphite);
  margin: 44px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-hairline);
  letter-spacing: -0.02em;
}

.article-rich-body h3 {
  font-size: 1.25rem;
  font-weight: 750;
  color: var(--text-graphite);
  margin: 28px 0 12px;
}

.article-rich-body p {
  margin-bottom: 18px;
}

.article-rich-body ul,
.article-rich-body ol {
  padding-left: 24px;
  margin-bottom: 20px;
}

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

.article-rich-body strong {
  color: var(--text-graphite);
}

.article-rich-body a {
  color: var(--telecom-azure);
  text-decoration: underline;
  font-weight: 600;
}

.article-rich-body a:hover {
  color: var(--telecom-azure-hover);
}

/* Data Table in Article */
.article-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0 28px;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
}

.article-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  text-align: left;
}

.article-data-table th {
  background: var(--surface-subtle);
  padding: 12px 16px;
  font-weight: 700;
  color: var(--text-graphite);
  border-bottom: 1px solid var(--border-hairline);
  white-space: nowrap;
}

.article-data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-hairline);
  color: var(--text-graphite-secondary);
}

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

/* Callouts in Article */
.article-callout {
  padding: 18px 22px;
  border-radius: var(--radius-xs);
  margin: 24px 0;
  border-left: 4px solid;
}

.article-callout-info {
  background: rgba(0, 102, 255, 0.06);
  border-color: var(--telecom-azure);
  color: var(--text-graphite);
}

.article-callout-tip {
  background: rgba(16, 185, 129, 0.06);
  border-color: #10b981;
  color: var(--text-graphite);
}

/* Article FAQ Block */
.article-faq-section {
  margin: 48px 0 36px;
  padding-top: 32px;
  border-top: 1px solid var(--border-hairline);
}

.article-faq-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-graphite);
  margin-bottom: 20px;
}

/* Article In-text CTA Box */
.article-cta-box {
  background: var(--slate-navy-hero);
  color: #ffffff;
  border-radius: var(--radius-sm);
  padding: 32px;
  margin: 36px 0;
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: #ffffff;
}

.article-cta-box p {
  color: #94a3b8;
  font-size: 0.95rem;
  max-width: 600px;
  margin: 0 auto 20px;
}

/* Related Articles Block (相关阅读) */
.article-related-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-hairline);
}

.article-related-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-graphite);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.related-card {
  background: var(--surface-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-smooth);
}

.related-card:hover {
  border-color: var(--telecom-azure);
  transform: translateY(-2px);
  box-shadow: var(--shadow-flat);
}

.related-card-tag {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--telecom-azure);
  margin-bottom: 6px;
  text-transform: uppercase;
}

.related-card-title {
  font-size: 1.02rem;
  font-weight: 750;
  color: var(--text-graphite);
  line-height: 1.45;
  margin-bottom: 8px;
}

.related-card-title a:hover {
  color: var(--telecom-azure);
}

.related-card-date {
  font-size: 0.78rem;
  color: var(--text-graphite-muted);
  margin-top: auto;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 992px) {
  .hero-headline-brand {
    font-size: clamp(1.8rem, 3.8vw, 2.4rem);
    white-space: nowrap;
  }

  .action-hubs-container,
  .announcement-list,
  .features-grid,
  .pricing-matrix,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .hero-header-row {
    flex-direction: column;
  }
}

@media (max-width: 1080px) {
  .nav-hairline-menu {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: var(--canvas-bg);
    border-bottom: 1px solid var(--border-hairline);
    flex-direction: column;
    padding: 12px 16px;
    gap: 4px;
    box-shadow: var(--shadow-card-hover);
    z-index: 999;
  }

  .nav-hairline-menu.active {
    display: flex;
  }

  .nav-hairline-item {
    width: 100%;
  }

  .nav-hairline-link {
    width: 100%;
    padding: 12px 18px;
    border-radius: var(--radius-xs);
    font-size: 0.96rem;
  }

  .nav-hairline-link::after {
    display: none;
  }

  .mobile-menu-trigger {
    display: inline-flex;
  }
}

@media (max-width: 768px) {
  .section-padding {
    padding: 56px 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .brand-identity {
    border-right: none;
    padding-right: 0;
  }

  .monolithic-hero-banner {
    padding: 48px 0 40px;
  }

  .hero-headline-brand {
    font-size: clamp(1.35rem, 4.6vw, 1.95rem);
    white-space: nowrap;
  }

  .hero-subhead-declaration {
    font-size: 1.2rem;
  }

  .hero-actions-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions-group .btn {
    width: 100%;
  }

  .action-hubs-container,
  .announcement-list,
  .features-grid,
  .pricing-matrix,
  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .carrier-pills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-nav-carrier {
    gap: 18px;
  }

  .doc-carrier-page {
    padding: 24px 18px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-headline-brand {
    font-size: clamp(1.12rem, 5.2vw, 1.45rem);
    white-space: nowrap;
  }

  .carrier-pills-grid {
    grid-template-columns: 1fr;
  }

  .showcase-meta-points {
    grid-template-columns: 1fr;
  }
}