/* Tanz Cloud 飞毯加速 (tanzcloud.sbs) - Pure Native CSS Design System */
:root {
  --bg-deep: #050811;
  --bg-navy: #091022;
  --surface-card: rgba(12, 20, 40, 0.78);
  --surface-card-strong: rgba(15, 25, 50, 0.92);
  --surface-glass: rgba(18, 30, 58, 0.56);
  --border-subtle: rgba(56, 189, 248, 0.16);
  --border-glow: rgba(6, 214, 242, 0.48);
  --cyan: #06d6f2;
  --cyan-bright: #5be9ff;
  --amber: #ff8a1e;
  --amber-soft: #ffbe6b;
  --magenta: #ff3d8b;
  --emerald: #10d897;
  --text-main: #f4f7fc;
  --text-body: #b7c5df;
  --text-muted: #7f92b8;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --shadow-card: 0 18px 42px rgba(2, 6, 18, 0.55);
  --shadow-glow: 0 0 36px rgba(6, 214, 242, 0.18);
  --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-deep);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration: none;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.container {
  width: min(1220px, calc(100% - 2.25rem));
  margin-inline: auto;
}

/* ================================
   Dynamic Animated Background (0 JS)
   ================================ */
.dynamic-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(circle at 15% 15%, rgba(6, 214, 242, 0.12), transparent 44%),
    radial-gradient(circle at 86% 24%, rgba(255, 138, 30, 0.11), transparent 42%),
    radial-gradient(circle at 55% 88%, rgba(255, 61, 139, 0.1), transparent 46%),
    linear-gradient(165deg, #040710 0%, #070e1f 52%, #050914 100%);
}

.bg-grid {
  position: absolute;
  inset: -120px;
  background-image:
    linear-gradient(to right, rgba(6, 214, 242, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(6, 214, 242, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 85% 75% at 50% 35%, #000 30%, transparent 100%);
  animation: gridSlide 26s linear infinite;
}

.bg-aurora {
  position: absolute;
  border-radius: 50%;
  filter: blur(76px);
  opacity: 0.45;
  will-change: transform;
}

.bg-aurora--cyan {
  width: 48vw;
  height: 48vw;
  max-width: 640px;
  max-height: 640px;
  top: -12%;
  left: -8%;
  background: radial-gradient(circle, rgba(6, 214, 242, 0.42), rgba(6, 214, 242, 0) 70%);
  animation: auroraOrbitA 22s ease-in-out infinite alternate;
}

.bg-aurora--amber {
  width: 44vw;
  height: 44vw;
  max-width: 580px;
  max-height: 580px;
  top: 22%;
  right: -10%;
  background: radial-gradient(circle, rgba(255, 138, 30, 0.34), rgba(255, 138, 30, 0) 70%);
  animation: auroraOrbitB 26s ease-in-out infinite alternate;
}

.bg-aurora--magenta {
  width: 42vw;
  height: 42vw;
  max-width: 560px;
  max-height: 560px;
  bottom: -14%;
  left: 28%;
  background: radial-gradient(circle, rgba(255, 61, 139, 0.28), rgba(255, 61, 139, 0) 72%);
  animation: auroraOrbitC 29s ease-in-out infinite alternate;
}

.bg-stream {
  position: absolute;
  width: 48vw;
  height: 2px;
  border-radius: 999px;
  opacity: 0;
  transform: rotate(-16deg);
  will-change: transform, opacity;
}

.bg-stream--one {
  top: 18%;
  left: -30%;
  background: linear-gradient(90deg, transparent, rgba(6, 214, 242, 0.85), rgba(255, 138, 30, 0.7), transparent);
  animation: carpetStreak 11s ease-in-out infinite;
}

.bg-stream--two {
  top: 52%;
  left: -35%;
  background: linear-gradient(90deg, transparent, rgba(255, 138, 30, 0.78), rgba(255, 61, 139, 0.7), transparent);
  animation: carpetStreak 15s ease-in-out 3.5s infinite;
}

.bg-stream--three {
  top: 78%;
  left: -25%;
  background: linear-gradient(90deg, transparent, rgba(6, 214, 242, 0.65), rgba(16, 216, 151, 0.65), transparent);
  animation: carpetStreak 13s ease-in-out 7s infinite;
}

@keyframes gridSlide {
  0% { transform: translate3d(0, 0, 0); }
  100% { transform: translate3d(64px, 64px, 0); }
}

@keyframes auroraOrbitA {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(10vw, 7vh, 0) scale(1.16); }
}

@keyframes auroraOrbitB {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(-11vw, 9vh, 0) scale(1.14); }
}

@keyframes auroraOrbitC {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(7vw, -10vh, 0) scale(1.18); }
}

@keyframes carpetStreak {
  0% { opacity: 0; transform: translate3d(0, 0, 0) rotate(-16deg); }
  15% { opacity: 0.75; }
  60% { opacity: 0.55; }
  100% { opacity: 0; transform: translate3d(145vw, -36vh, 0) rotate(-16deg); }
}

@media (prefers-reduced-motion: reduce) {
  .bg-grid,
  .bg-aurora,
  .bg-stream,
  .pulse-dot::after {
    animation: none !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ================================
   Header & Navigation (Top-Left Logo)
   ================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(5, 8, 17, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(56, 189, 248, 0.14);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 74px;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.78rem;
  flex-shrink: 0;
}

.brand-logo-wrap {
  width: 46px;
  height: 46px;
  padding: 2px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--amber), var(--magenta));
  box-shadow: 0 0 20px rgba(6, 214, 242, 0.28);
  flex-shrink: 0;
}

.brand-logo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background: #fffcf5;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-title {
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--text-main);
}

.brand-sub {
  font-size: 0.75rem;
  color: var(--cyan-bright);
  letter-spacing: 0.04em;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
  font-size: 0.92rem;
  color: var(--text-body);
}

.desktop-nav a {
  transition: color 0.2s ease;
  white-space: nowrap;
}

.desktop-nav a:hover {
  color: var(--cyan-bright);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mobile-menu {
  display: none;
  position: relative;
}

.mobile-menu summary {
  list-style: none;
  cursor: pointer;
  padding: 0.48rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: var(--surface-glass);
  color: var(--text-main);
  font-size: 0.86rem;
  font-weight: 600;
}

.mobile-menu summary::-webkit-details-marker {
  display: none;
}

.mobile-drawer {
  position: absolute;
  right: 0;
  top: calc(100% + 0.65rem);
  width: 240px;
  padding: 0.85rem;
  border-radius: var(--radius-md);
  background: var(--surface-card-strong);
  border: 1px solid var(--border-glow);
  box-shadow: var(--shadow-card);
  display: grid;
  gap: 0.45rem;
}

.mobile-drawer a {
  padding: 0.5rem 0.7rem;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-body);
}

.mobile-drawer a:hover {
  background: rgba(6, 214, 242, 0.12);
  color: var(--text-main);
}

/* ================================
   Buttons & Badges
   ================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.72rem 1.35rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.94rem;
  line-height: 1.2;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(120deg, var(--cyan) 0%, #2b8cff 48%, var(--amber) 100%);
  color: #040814;
  box-shadow: 0 10px 28px rgba(6, 214, 242, 0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(6, 214, 242, 0.4);
}

.btn-secondary {
  background: rgba(15, 25, 50, 0.78);
  color: var(--text-main);
  border: 1px solid rgba(91, 233, 255, 0.34);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  border-color: var(--cyan-bright);
  background: rgba(22, 37, 72, 0.9);
}

.btn-sm {
  padding: 0.52rem 1.05rem;
  font-size: 0.86rem;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.38rem 0.95rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--cyan-bright);
  background: rgba(6, 214, 242, 0.1);
  border: 1px solid rgba(6, 214, 242, 0.32);
}

.pulse-dot {
  position: relative;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald);
  display: inline-block;
}

.pulse-dot::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1.5px solid var(--emerald);
  animation: pulseRing 2s ease-out infinite;
}

@keyframes pulseRing {
  0% { transform: scale(0.7); opacity: 0.9; }
  100% { transform: scale(1.9); opacity: 0; }
}

/* ================================
   Hero Section
   ================================ */
.hero {
  padding: 4.4rem 0 3.6rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.92fr);
  gap: 2.5rem;
  align-items: center;
}

.hero-title {
  margin: 1rem 0 1.15rem;
  font-size: clamp(1.85rem, 3.3vw, 2.95rem);
  line-height: 1.2;
  font-weight: 850;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(110deg, var(--cyan-bright) 10%, #ffffff 48%, var(--amber-soft) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  margin: 0 0 1.6rem;
  color: var(--text-body);
  font-size: 1.05rem;
  max-width: 60ch;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-bottom: 1.7rem;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
}

.metric-chip {
  padding: 0.85rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--surface-glass);
  border: 1px solid var(--border-subtle);
}

.metric-val {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--cyan-bright);
}

.metric-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.12rem;
}

.telemetry-panel {
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid rgba(6, 214, 242, 0.25);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  padding: 1.45rem;
  backdrop-filter: blur(14px);
}

.telemetry-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding-bottom: 0.95rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 1rem;
}

.telemetry-title {
  font-size: 0.96rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.telemetry-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--amber-soft);
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background: rgba(255, 138, 30, 0.14);
  border: 1px solid rgba(255, 138, 30, 0.3);
}

.node-list {
  display: grid;
  gap: 0.68rem;
}

.node-row {
  display: grid;
  grid-template-columns: 1.35fr 0.75fr 0.95fr;
  align-items: center;
  gap: 0.75rem;
  padding: 0.68rem 0.85rem;
  border-radius: 12px;
  background: rgba(7, 13, 28, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.86rem;
}

.node-name {
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.node-ping {
  font-family: var(--font-mono);
  color: var(--emerald);
  font-weight: 700;
  text-align: right;
}

.node-cap {
  font-size: 0.76rem;
  color: var(--text-muted);
  text-align: right;
}

.telemetry-foot {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ================================
   Sections Common
   ================================ */
.section {
  padding: 4.2rem 0;
}

.section-head {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 2.5rem;
}

.section-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-soft);
  margin-bottom: 0.5rem;
}

.section-title {
  margin: 0 0 0.7rem;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  line-height: 1.25;
  font-weight: 800;
}

.section-desc {
  margin: 0;
  color: var(--text-body);
  font-size: 1rem;
}

/* ================================
   Pricing Section (Strictly Single Row)
   ================================ */
.pricing-shell {
  position: relative;
}

.sr-radio {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.billing-switch-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
}

.billing-switch {
  display: inline-flex;
  padding: 0.35rem;
  border-radius: 999px;
  background: rgba(11, 18, 37, 0.9);
  border: 1px solid rgba(6, 214, 242, 0.25);
  gap: 0.35rem;
}

.billing-label {
  cursor: pointer;
  padding: 0.55rem 1.25rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-body);
  transition: background 0.2s ease, color 0.2s ease;
  user-select: none;
}

.billing-tag {
  margin-left: 0.4rem;
  padding: 0.14rem 0.48rem;
  border-radius: 999px;
  font-size: 0.72rem;
  background: rgba(255, 138, 30, 0.2);
  color: var(--amber-soft);
}

#cycle-monthly:checked ~ .billing-switch-wrap .label-monthly {
  background: linear-gradient(120deg, var(--cyan), #2b8cff);
  color: #040814;
}

#cycle-annual:checked ~ .billing-switch-wrap .label-annual {
  background: linear-gradient(120deg, var(--amber), var(--magenta));
  color: #fff;
}

#cycle-annual:checked ~ .billing-switch-wrap .label-annual .billing-tag {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
}

.price-annual {
  display: none;
}

#cycle-annual:checked ~ .pricing-row .price-monthly {
  display: none;
}

#cycle-annual:checked ~ .pricing-row .price-annual {
  display: block;
}

/* Force all pricing tiers on ONE horizontal row */
.pricing-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.45rem;
  align-items: stretch;
}

.price-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.85rem 1.65rem;
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(14px);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.price-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
}

.price-card--featured {
  background: linear-gradient(165deg, rgba(13, 27, 56, 0.94), rgba(10, 18, 38, 0.94));
  border: 1.5px solid rgba(6, 214, 242, 0.56);
  box-shadow: 0 22px 50px rgba(6, 214, 242, 0.16);
}

.plan-ribbon {
  position: absolute;
  top: -12px;
  right: 22px;
  padding: 0.26rem 0.85rem;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 800;
  color: #040814;
  background: linear-gradient(90deg, var(--cyan-bright), var(--amber-soft));
}

.plan-name {
  margin: 0;
  font-size: 1.32rem;
  font-weight: 800;
}

.plan-sub {
  margin: 0.32rem 0 1.2rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.plan-price-box {
  padding: 1rem 1.05rem;
  border-radius: 14px;
  background: rgba(5, 10, 22, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 1.25rem;
}

.price-figure {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.price-currency {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--cyan-bright);
}

.price-amount {
  font-family: var(--font-mono);
  font-size: 2.35rem;
  line-height: 1;
  font-weight: 800;
  color: var(--text-main);
}

.price-unit {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.price-alt-note {
  margin-top: 0.48rem;
  font-size: 0.82rem;
  color: var(--amber-soft);
}

.plan-specs {
  list-style: none;
  margin: 0 0 1.55rem;
  padding: 0;
  display: grid;
  gap: 0.65rem;
  font-size: 0.91rem;
  color: var(--text-body);
}

.plan-specs li {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
}

.spec-check {
  color: var(--emerald);
  font-weight: 800;
  flex-shrink: 0;
}

.price-card .btn {
  margin-top: auto;
  width: 100%;
}

.mobile-scroll-hint {
  display: none;
  text-align: center;
  margin-top: 0.8rem;
  font-size: 0.82rem;
  color: var(--cyan-bright);
}

.trial-banner {
  margin-top: 1.55rem;
  padding: 1.2rem 1.5rem;
  border-radius: var(--radius-md);
  background: linear-gradient(100deg, rgba(6, 214, 242, 0.11), rgba(255, 138, 30, 0.11));
  border: 1px solid rgba(6, 214, 242, 0.28);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.trial-banner p {
  margin: 0;
  color: var(--text-body);
  font-size: 0.94rem;
}

.trial-banner strong {
  color: var(--text-main);
}

.spec-table-wrap {
  margin-top: 1.65rem;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--surface-card);
}

.spec-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.spec-table th,
.spec-table td {
  padding: 0.88rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.spec-table thead th {
  color: var(--cyan-bright);
  background: rgba(6, 214, 242, 0.08);
  font-weight: 700;
}

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

/* ================================
   Feature Grid & Network Topology
   ================================ */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.35rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.35rem;
}

.glass-card {
  padding: 1.55rem;
  border-radius: var(--radius-md);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(12px);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.95rem;
  background: linear-gradient(135deg, rgba(6, 214, 242, 0.18), rgba(255, 138, 30, 0.16));
  border: 1px solid rgba(6, 214, 242, 0.3);
  color: var(--cyan-bright);
}

.glass-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.1rem;
  font-weight: 750;
}

.glass-card p {
  margin: 0;
  color: var(--text-body);
  font-size: 0.91rem;
}

.topology-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.95fr);
  gap: 1.5rem;
  align-items: center;
}

.topology-figure {
  padding: 1rem;
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
}

.region-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.95rem;
}

.region-card {
  padding: 1.05rem;
  border-radius: 14px;
  background: var(--surface-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.region-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.38rem;
  font-weight: 700;
}

.region-ping {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--emerald);
}

.region-card p {
  margin: 0;
  font-size: 0.84rem;
  color: var(--text-muted);
}

/* ================================
   Pure-CSS Client Setup Tabs
   ================================ */
.platform-tabs {
  position: relative;
}

.tab-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
  margin-bottom: 1.5rem;
}

.tab-btn {
  cursor: pointer;
  padding: 0.62rem 1.25rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-body);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  transition: all 0.2s ease;
}

.tab-panel {
  display: none;
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
}

#plat-win:checked ~ .tab-nav label[for="plat-win"],
#plat-ios:checked ~ .tab-nav label[for="plat-ios"],
#plat-android:checked ~ .tab-nav label[for="plat-android"],
#plat-router:checked ~ .tab-nav label[for="plat-router"] {
  background: linear-gradient(120deg, var(--cyan), #2b8cff);
  color: #040814;
  border-color: transparent;
}

#plat-win:checked ~ .tab-panels .panel-win,
#plat-ios:checked ~ .tab-panels .panel-ios,
#plat-android:checked ~ .tab-panels .panel-android,
#plat-router:checked ~ .tab-panels .panel-router {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 1.65rem;
  align-items: start;
}

.step-list {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.72rem;
  color: var(--text-body);
  font-size: 0.93rem;
}

.step-list strong {
  color: var(--text-main);
}

.ext-resource-box {
  padding: 1.25rem;
  border-radius: 14px;
  background: rgba(6, 11, 24, 0.82);
  border: 1px solid rgba(255, 138, 30, 0.25);
}

.ext-resource-box h4 {
  margin: 0 0 0.7rem;
  font-size: 0.98rem;
  color: var(--amber-soft);
}

.ext-links {
  display: grid;
  gap: 0.6rem;
}

.ext-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.58rem 0.8rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.86rem;
  color: var(--cyan-bright);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.ext-link:hover {
  border-color: var(--cyan);
  background: rgba(6, 214, 242, 0.09);
}

/* ================================
   Articles Grid
   ================================ */
.article-card {
  display: flex;
  flex-direction: column;
  padding: 1.45rem;
  border-radius: var(--radius-md);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  transition: transform 0.22s ease, border-color 0.22s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.76rem;
  color: var(--amber-soft);
  margin-bottom: 0.65rem;
  font-family: var(--font-mono);
}

.article-card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.06rem;
  line-height: 1.42;
}

.article-card p {
  margin: 0 0 1.1rem;
  font-size: 0.88rem;
  color: var(--text-body);
}

.article-more {
  margin-top: auto;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--cyan-bright);
}

/* ================================
   Testimonials & FAQ
   ================================ */
.review-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.45rem;
  border-radius: var(--radius-md);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
}

.review-stars {
  color: var(--amber-soft);
  font-size: 0.95rem;
  letter-spacing: 0.1em;
}

.review-quote {
  margin: 0;
  color: var(--text-body);
  font-size: 0.91rem;
}

.review-author {
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.83rem;
}

.review-author strong {
  color: var(--text-main);
}

.review-author span {
  color: var(--text-muted);
}

.faq-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.faq-item {
  border-radius: var(--radius-md);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  padding: 1rem 1.25rem;
  align-self: start;
}

.faq-item[open] {
  border-color: var(--border-glow);
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text-main);
}

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

.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--cyan-bright);
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  content: "−";
  color: var(--amber-soft);
}

.faq-answer {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-body);
  font-size: 0.9rem;
}

/* ================================
   Outbound Tools & Final CTA & Footer
   ================================ */
.final-cta {
  padding: 2.6rem 2rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(125deg, rgba(6, 214, 242, 0.16), rgba(14, 24, 52, 0.92), rgba(255, 138, 30, 0.16));
  border: 1px solid rgba(6, 214, 242, 0.35);
  text-align: center;
  box-shadow: var(--shadow-card);
}

.final-cta h2 {
  margin: 0 0 0.65rem;
  font-size: clamp(1.5rem, 2.8vw, 2.1rem);
}

.final-cta p {
  margin: 0 auto 1.45rem;
  max-width: 62ch;
  color: var(--text-body);
}

.site-footer {
  margin-top: 3.5rem;
  padding: 3.2rem 0 2.2rem;
  background: rgba(4, 7, 15, 0.92);
  border-top: 1px solid rgba(56, 189, 248, 0.15);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 2.2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-col h4 {
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
  color: var(--text-main);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.48rem;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--cyan-bright);
}

.footer-bottom {
  padding-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ================================
   Responsive Breakpoints
   ================================ */
@media (max-width: 1040px) {
  .desktop-nav {
    display: none;
  }
  .mobile-menu {
    display: block;
  }
  .hero-grid,
  .topology-wrap,
  #plat-win:checked ~ .tab-panels .panel-win,
  #plat-ios:checked ~ .tab-panels .panel-ios,
  #plat-android:checked ~ .tab-panels .panel-android,
  #plat-router:checked ~ .tab-panels .panel-router {
    grid-template-columns: 1fr;
  }
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  /* Keep all pricing cards strictly on ONE horizontal row even on mobile */
  .pricing-row {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: minmax(272px, 84%);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 0.75rem;
  }
  .price-card {
    scroll-snap-align: start;
  }
  .mobile-scroll-hint {
    display: block;
  }
  .faq-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .hero {
    padding-top: 2.8rem;
  }
  .hero-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid-4,
  .grid-3,
  .grid-2,
  .region-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .header-actions .btn-header-cta {
    padding: 0.48rem 0.85rem;
    font-size: 0.82rem;
  }
}