/* ==========================================================================
   抖云加速 (douyunjiasu.mom) — Pure Native CSS Stylesheet
   Zero external frameworks · Zero JS dependencies · Instant load architecture
   ========================================================================== */

:root {
  --bg-base: #050914;
  --bg-surface: rgba(11, 19, 38, 0.78);
  --bg-surface-strong: rgba(14, 24, 48, 0.92);
  --bg-card-hover: rgba(19, 33, 64, 0.92);
  --border-subtle: rgba(112, 165, 255, 0.16);
  --border-glow: rgba(255, 241, 168, 0.48);

  --text-primary: #f2f7ff;
  --text-secondary: #b4c7e7;
  --text-muted: #7f97be;

  --ice-yellow: #fff1a8;
  --ice-yellow-bright: #fff9d6;
  --cyan: #fff1a8;
  --cobalt: #ffe37a;
  --indigo: #5e35ff;
  --amber: #ff8a00;
  --gold: #ffd54f;
  --emerald: #00e676;

  --grad-brand: linear-gradient(135deg, #fffdf0 0%, #fff1a8 55%, #ffd95a 100%);
  --grad-cta: linear-gradient(135deg, #fffdf0 0%, #fff1a8 100%);
  --grad-ice-yellow: linear-gradient(135deg, #fffdf0 0%, #fff3b0 55%, #ffe787 100%);
  --grad-hot: linear-gradient(135deg, #ff9800 0%, #ff5722 100%);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --shadow-card: 0 18px 45px -20px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(120, 170, 255, 0.08);
  --shadow-glow: 0 12px 36px -10px rgba(255, 241, 168, 0.25);

  --container-max: 1200px;
  --font-sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  background-color: var(--bg-base);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: transparent;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

main,
.site-footer {
  position: relative;
  z-index: 1;
}

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

a {
  color: var(--ice-yellow);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease, transform 0.2s ease;
}

a:hover {
  color: var(--ice-yellow-bright);
}

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

/* ==========================================================================
   Dynamic Animated CSS Backdrop (Zero JS, GPU Composited)
   ========================================================================== */

.ambient-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(ellipse 90% 60% at 50% -10%, rgba(41, 121, 255, 0.22), transparent 70%),
    radial-gradient(ellipse 70% 50% at 95% 90%, rgba(0, 229, 255, 0.14), transparent 65%),
    #050914;
}

.aurora-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  will-change: transform, opacity;
}

.aurora-orb--a {
  width: 560px;
  height: 560px;
  top: -140px;
  left: -120px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.26) 0%, rgba(41, 121, 255, 0.08) 55%, transparent 75%);
  animation: orbDriftA 22s ease-in-out infinite alternate;
}

.aurora-orb--b {
  width: 640px;
  height: 640px;
  bottom: -180px;
  right: -140px;
  background: radial-gradient(circle, rgba(94, 53, 255, 0.28) 0%, rgba(0, 229, 255, 0.09) 55%, transparent 75%);
  animation: orbDriftB 28s ease-in-out infinite alternate;
}

.aurora-orb--c {
  width: 420px;
  height: 420px;
  top: 42%;
  left: 48%;
  background: radial-gradient(circle, rgba(255, 138, 0, 0.12) 0%, rgba(41, 121, 255, 0.06) 55%, transparent 75%);
  animation: orbDriftC 25s ease-in-out infinite alternate;
}

.cyber-grid {
  position: absolute;
  inset: -40px;
  background-image:
    linear-gradient(to right, rgba(72, 132, 255, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(72, 132, 255, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 50% 35%, rgba(0, 0, 0, 0.9) 25%, transparent 82%);
  -webkit-mask-image: radial-gradient(circle at 50% 35%, rgba(0, 0, 0, 0.9) 25%, transparent 82%);
  animation: gridPan 36s linear infinite;
}

.pulse-streams {
  position: absolute;
  inset: 0;
}

.pulse-streak {
  position: absolute;
  bottom: -120px;
  width: 2px;
  height: 110px;
  border-radius: 999px;
  background: linear-gradient(to top, transparent, rgba(0, 229, 255, 0.72), transparent);
  opacity: 0;
  animation: streakRise 9s linear infinite;
}

.pulse-streak:nth-child(1) { left: 11%; animation-delay: 0s; animation-duration: 8s; }
.pulse-streak:nth-child(2) { left: 26%; animation-delay: 2.2s; animation-duration: 10.5s; height: 140px; }
.pulse-streak:nth-child(3) { left: 44%; animation-delay: 4.1s; animation-duration: 9s; }
.pulse-streak:nth-child(4) { left: 63%; animation-delay: 1.4s; animation-duration: 11s; height: 150px; }
.pulse-streak:nth-child(5) { left: 79%; animation-delay: 3.7s; animation-duration: 8.5s; }
.pulse-streak:nth-child(6) { left: 91%; animation-delay: 5.5s; animation-duration: 10s; }

/* Floating Multi-App Dynamic Layer (Pure CSS) */
.app-float-layer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.app-tile {
  position: absolute;
  bottom: -100px;
  width: 68px;
  height: 68px;
  border-radius: 17px;
  background: rgba(15, 28, 60, 0.68);
  border: 1px solid rgba(255, 241, 168, 0.26);
  box-shadow: 0 10px 26px -10px rgba(0, 0, 0, 0.72), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  will-change: transform, opacity;
  opacity: 0;
  animation: appFloatRise 26s linear infinite;
}

.app-tile svg {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
}

.app-tile span {
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: rgba(235, 244, 255, 0.85);
  line-height: 1;
}

.app-tile:nth-child(1)  { left: 4%;  animation-duration: 24s; animation-delay: -3s; }
.app-tile:nth-child(2)  { left: 11%; animation-duration: 29s; animation-delay: -14s; }
.app-tile:nth-child(3)  { left: 18%; animation-duration: 22s; animation-delay: -8s; }
.app-tile:nth-child(4)  { left: 26%; animation-duration: 31s; animation-delay: -21s; }
.app-tile:nth-child(5)  { left: 34%; animation-duration: 25s; animation-delay: -5s; }
.app-tile:nth-child(6)  { left: 43%; animation-duration: 28s; animation-delay: -17s; }
.app-tile:nth-child(7)  { left: 52%; animation-duration: 23s; animation-delay: -11s; }
.app-tile:nth-child(8)  { left: 61%; animation-duration: 30s; animation-delay: -24s; }
.app-tile:nth-child(9)  { left: 69%; animation-duration: 26s; animation-delay: -6s; }
.app-tile:nth-child(10) { left: 77%; animation-duration: 27s; animation-delay: -19s; }
.app-tile:nth-child(11) { left: 84%; animation-duration: 22s; animation-delay: -12s; }
.app-tile:nth-child(12) { left: 91%; animation-duration: 29s; animation-delay: -2s; }
.app-tile:nth-child(13) { left: 7%;  animation-duration: 32s; animation-delay: -26s; }
.app-tile:nth-child(14) { left: 88%; animation-duration: 24s; animation-delay: -16s; }

.app-tile:nth-child(even) {
  animation-name: appFloatRiseAlt;
}

@keyframes appFloatRise {
  0% {
    transform: translate3d(0, 0, 0) rotate(-6deg) scale(0.92);
    opacity: 0;
  }
  8% {
    opacity: 0.62;
  }
  50% {
    transform: translate3d(24px, -62vh, 0) rotate(5deg) scale(1);
    opacity: 0.52;
  }
  88% {
    opacity: 0.45;
  }
  100% {
    transform: translate3d(-18px, -125vh, 0) rotate(-4deg) scale(0.94);
    opacity: 0;
  }
}

@keyframes appFloatRiseAlt {
  0% {
    transform: translate3d(0, 0, 0) rotate(6deg) scale(0.9);
    opacity: 0;
  }
  8% {
    opacity: 0.56;
  }
  50% {
    transform: translate3d(-26px, -62vh, 0) rotate(-5deg) scale(1.02);
    opacity: 0.48;
  }
  88% {
    opacity: 0.4;
  }
  100% {
    transform: translate3d(20px, -125vh, 0) rotate(4deg) scale(0.92);
    opacity: 0;
  }
}

@keyframes orbDriftA {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(110px, 70px, 0) scale(1.14); }
}

@keyframes orbDriftB {
  0% { transform: translate3d(0, 0, 0) scale(1.06); }
  100% { transform: translate3d(-120px, -85px, 0) scale(0.95); }
}

@keyframes orbDriftC {
  0% { transform: translate3d(-50%, -50%, 0) scale(0.95); }
  100% { transform: translate3d(-42%, -58%, 0) scale(1.15); }
}

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

@keyframes streakRise {
  0% {
    transform: translate3d(0, 0, 0);
    opacity: 0;
  }
  15% {
    opacity: 0.55;
  }
  80% {
    opacity: 0.3;
  }
  100% {
    transform: translate3d(0, -115vh, 0);
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .aurora-orb,
  .cyber-grid,
  .pulse-streak,
  .app-tile {
    animation: none !important;
  }
  .app-tile {
    opacity: 0.34;
    bottom: auto;
  }
  .app-tile:nth-child(odd) { top: 18%; }
  .app-tile:nth-child(even) { top: 62%; }
  .app-tile:nth-child(3n) { top: 40%; }
}

/* ==========================================================================
   Layout & Containers
   ========================================================================== */

.container {
  width: min(100% - 2rem, var(--container-max));
  margin-inline: auto;
}

.section {
  padding-block: 4.5rem;
}

.section-header {
  max-width: 760px;
  margin-bottom: 2.5rem;
}

.section-header--center {
  text-align: center;
  margin-inline: auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.36rem 0.9rem;
  border-radius: var(--radius-pill);
  background: rgba(255, 241, 168, 0.1);
  border: 1px solid rgba(255, 241, 168, 0.32);
  color: var(--ice-yellow);
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-bottom: 1rem;
}

.section-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.section-desc {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1.02rem;
}

/* ==========================================================================
   Sticky Header with Top-Left Logo & Pure-CSS Mobile Menu
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 10, 22, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  min-height: 72px;
  position: relative;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  color: var(--text-primary);
}

.brand-logo img {
  height: 44px;
  width: auto;
}

.nav-toggle-input {
  display: none;
}

.nav-toggle-label {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: rgba(16, 28, 56, 0.7);
  color: var(--text-primary);
  cursor: pointer;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

.main-nav a {
  color: var(--text-secondary);
  font-size: 0.94rem;
  font-weight: 500;
  white-space: nowrap;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.72rem 1.45rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.96rem;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: var(--grad-ice-yellow);
  color: #1c1605;
  box-shadow: 0 8px 24px -8px rgba(255, 240, 160, 0.52);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #ffffff 0%, #fff7c2 55%, #ffec99 100%);
  color: #140f02;
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -8px rgba(255, 240, 160, 0.72);
}

.btn-hot {
  background: var(--grad-hot);
  color: #ffffff;
  box-shadow: 0 8px 24px -8px rgba(255, 110, 30, 0.65);
}

.btn-hot:hover {
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -8px rgba(255, 110, 30, 0.85);
}

.btn-outline {
  background: rgba(14, 25, 50, 0.72);
  color: var(--text-primary);
  border-color: rgba(108, 165, 255, 0.34);
}

.btn-outline:hover {
  color: var(--ice-yellow);
  border-color: var(--ice-yellow);
  background: rgba(255, 241, 168, 0.08);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.52rem 1.1rem;
  font-size: 0.88rem;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  padding-block: 4.5rem 3.5rem;
}

.hero-grid {
  max-width: 880px;
  margin-inline: auto;
  text-align: center;
}

.hero-title {
  margin: 0 0 1.15rem;
  font-size: clamp(2.1rem, 4.4vw, 3.35rem);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(95deg, #ffffff 0%, #fff9d2 45%, #ffea8a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  margin: 0 auto 1.85rem;
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 64ch;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem;
  margin-bottom: 2.25rem;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  text-align: left;
}

.metric-chip {
  padding: 0.95rem 1.1rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
}

.metric-chip strong {
  display: block;
  font-size: 1.25rem;
  color: var(--cyan);
  font-weight: 800;
  line-height: 1.25;
}

.metric-chip span {
  font-size: 0.83rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Pricing Section — All Plans Strictly in One Horizontal Row (同排)
   ========================================================================== */

.pricing-scroll-hint {
  display: none;
  text-align: center;
  font-size: 0.84rem;
  color: var(--cyan);
  margin-bottom: 0.85rem;
}

.pricing-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  align-items: stretch;
}

.plan-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.9rem 1.65rem;
  border-radius: var(--radius-lg);
  background: var(--bg-surface-strong);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.plan-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 241, 168, 0.45);
}

.plan-card--featured {
  background: linear-gradient(175deg, rgba(15, 33, 72, 0.96) 0%, rgba(10, 18, 40, 0.98) 100%);
  border: 1.5px solid var(--ice-yellow);
  box-shadow: var(--shadow-card), 0 0 42px -12px rgba(255, 241, 168, 0.24);
}

.plan-badge {
  position: absolute;
  top: -13px;
  right: 1.4rem;
  padding: 0.26rem 0.85rem;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  background: var(--grad-ice-yellow);
  color: #1c1605;
  box-shadow: 0 6px 16px -4px rgba(255, 241, 168, 0.5);
}

.plan-badge--amber {
  background: var(--grad-hot);
  color: #ffffff;
  box-shadow: 0 6px 16px -4px rgba(255, 110, 30, 0.6);
}

.plan-name {
  margin: 0 0 0.35rem;
  font-size: 1.32rem;
  font-weight: 800;
}

.plan-sub {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  min-height: 2.8em;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  padding-bottom: 1.2rem;
  margin-bottom: 1.2rem;
  border-bottom: 1px solid var(--border-subtle);
}

.plan-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--cyan);
}

.plan-amount {
  font-size: 2.45rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.plan-card--featured .plan-amount {
  color: var(--gold);
}

.plan-period {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.plan-quota {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 1.1rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 241, 168, 0.1);
  border: 1px solid rgba(255, 241, 168, 0.26);
  color: #fff6c9;
  font-weight: 700;
  font-size: 0.92rem;
}

.plan-features {
  list-style: none;
  margin: 0 0 1.6rem;
  padding: 0;
  display: grid;
  gap: 0.68rem;
  font-size: 0.93rem;
  color: var(--text-secondary);
}

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

.plan-features li::before {
  content: "✓";
  color: var(--emerald);
  font-weight: 900;
  flex-shrink: 0;
}

.payment-strip {
  margin-top: 1.65rem;
  padding: 1rem 1.35rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.payment-methods {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.pay-tag {
  padding: 0.28rem 0.8rem;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.84rem;
}

/* Comparison Table for SEO & GEO */
.table-wrap {
  margin-top: 2.2rem;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-strong);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: 0.93rem;
}

.spec-table th,
.spec-table td {
  padding: 0.95rem 1.15rem;
  text-align: left;
  border-bottom: 1px solid rgba(112, 165, 255, 0.12);
}

.spec-table thead th {
  background: rgba(18, 34, 68, 0.9);
  color: var(--cyan);
  font-weight: 700;
}

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

.spec-table tbody tr:hover {
  background: rgba(255, 241, 168, 0.04);
}

/* ==========================================================================
   Feature Pillars & Node Coverage
   ========================================================================== */

.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: 1.5rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.glass-card:hover {
  border-color: rgba(255, 241, 168, 0.36);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}

.icon-box {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 241, 168, 0.11);
  border: 1px solid rgba(255, 241, 168, 0.28);
  color: var(--ice-yellow);
  margin-bottom: 1rem;
}

.glass-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.12rem;
  font-weight: 700;
}

.glass-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.93rem;
}

.node-matrix {
  margin-top: 1.8rem;
  padding: 1.65rem;
  border-radius: var(--radius-lg);
  background: var(--bg-surface-strong);
  border: 1px solid var(--border-subtle);
}

.node-group-title {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--cyan);
}

.node-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1.25rem;
}

.node-tags:last-child {
  margin-bottom: 0;
}

.node-pill {
  padding: 0.34rem 0.82rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(112, 165, 255, 0.2);
  color: var(--text-primary);
}

.node-pill--vip2 {
  background: rgba(255, 138, 0, 0.1);
  border-color: rgba(255, 138, 0, 0.32);
  color: #ffd599;
}

/* ==========================================================================
   Articles Hub
   ========================================================================== */

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

.article-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.55rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface-strong);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
  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;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.7rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.kw-badge {
  padding: 0.2rem 0.62rem;
  border-radius: var(--radius-pill);
  background: rgba(255, 241, 168, 0.12);
  border: 1px solid rgba(255, 241, 168, 0.28);
  color: var(--ice-yellow);
  font-weight: 600;
}

.article-card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.15rem;
  line-height: 1.4;
}

.article-card h3 a {
  color: var(--text-primary);
}

.article-card h3 a:hover {
  color: var(--cyan);
}

.article-card p {
  margin: 0 0 1.15rem;
  color: var(--text-secondary);
  font-size: 0.93rem;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--cyan);
}

/* ==========================================================================
   External Resources & Onboarding Steps
   ========================================================================== */

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.35rem;
  margin-bottom: 2.2rem;
}

.step-card {
  padding: 1.5rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--grad-ice-yellow);
  color: #1c1605;
  font-weight: 800;
  font-family: var(--font-mono);
  margin-bottom: 0.85rem;
}

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

.ext-link-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.15rem 1.2rem;
  border-radius: var(--radius-md);
  background: rgba(10, 18, 36, 0.88);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.ext-link-card:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.ext-link-card strong {
  display: block;
  font-size: 0.98rem;
  margin-bottom: 0.3rem;
  color: var(--text-primary);
}

.ext-link-card span {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 0.55rem;
}

.ext-link-card em {
  font-style: normal;
  font-size: 0.8rem;
  color: var(--cyan);
  font-weight: 600;
}

/* ==========================================================================
   User Reviews (Bottom Section)
   ========================================================================== */

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

.review-card {
  padding: 1.5rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface-strong);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  color: var(--gold);
  letter-spacing: 0.12em;
  font-size: 0.95rem;
  margin-bottom: 0.65rem;
}

.review-quote {
  margin: 0 0 1.2rem;
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.72;
}

.review-author {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.9rem;
  border-top: 1px solid rgba(112, 165, 255, 0.12);
  font-size: 0.85rem;
}

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

.review-author span {
  color: var(--cyan);
  font-size: 0.78rem;
}

/* ==========================================================================
   FAQ Pure-HTML <details> Accordion (Zero JS)
   ========================================================================== */

.faq-list {
  display: grid;
  gap: 0.9rem;
  max-width: 920px;
  margin-inline: auto;
}

.faq-item {
  border-radius: var(--radius-md);
  background: var(--bg-surface-strong);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: rgba(255, 241, 168, 0.45);
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 1.2rem 1.45rem;
  font-weight: 700;
  font-size: 1.02rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  color: var(--text-primary);
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--cyan);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-body {
  padding: 0 1.45rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  border-top: 1px solid rgba(112, 165, 255, 0.1);
  padding-top: 0.95rem;
}

.faq-body p {
  margin: 0;
}

/* ==========================================================================
   Bottom CTA Banner & Footer
   ========================================================================== */

.cta-banner {
  padding: 2.6rem 2rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(16, 36, 78, 0.94) 0%, rgba(10, 20, 44, 0.96) 100%);
  border: 1px solid rgba(255, 241, 168, 0.36);
  box-shadow: var(--shadow-glow);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.cta-banner h2 {
  margin: 0 0 0.45rem;
  font-size: clamp(1.4rem, 2.5vw, 1.95rem);
}

.cta-banner p {
  margin: 0;
  color: var(--text-secondary);
  max-width: 60ch;
}

.site-footer {
  margin-top: 3rem;
  padding-block: 3.2rem 2.2rem;
  background: rgba(4, 7, 16, 0.94);
  border-top: 1px solid var(--border-subtle);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.2rem;
}

.footer-col h4 {
  margin: 0 0 0.9rem;
  font-size: 0.96rem;
  color: var(--text-primary);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.52rem;
  font-size: 0.88rem;
}

.footer-links a {
  color: var(--text-muted);
}

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

.footer-bottom {
  padding-top: 1.4rem;
  border-top: 1px solid rgba(112, 165, 255, 0.12);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.84rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Individual Article Page Styles
   ========================================================================== */

.article-page-wrap {
  padding-block: 2.6rem 4rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.6rem;
}

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

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

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 2rem;
  align-items: start;
}

.article-main {
  padding: 2.2rem 2.3rem;
  border-radius: var(--radius-lg);
  background: var(--bg-surface-strong);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
}

.article-main h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  line-height: 1.32;
}

.article-info-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.2rem;
  font-size: 0.86rem;
  color: var(--text-muted);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.geo-summary-box {
  padding: 1.15rem 1.3rem;
  border-radius: var(--radius-md);
  background: rgba(255, 241, 168, 0.08);
  border-left: 4px solid var(--ice-yellow);
  margin-bottom: 1.65rem;
  font-size: 0.95rem;
  color: #fffbe6;
}

.geo-summary-box strong {
  display: block;
  color: var(--ice-yellow);
  margin-bottom: 0.35rem;
}

.article-content h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.32rem;
  color: var(--text-primary);
  padding-left: 0.75rem;
  border-left: 3px solid var(--cobalt);
}

.article-content h3 {
  margin: 1.4rem 0 0.55rem;
  font-size: 1.1rem;
  color: #d6e7ff;
}

.article-content p {
  margin: 0 0 1.05rem;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.85;
}

.article-content ul,
.article-content ol {
  margin: 0 0 1.2rem;
  padding-left: 1.35rem;
  color: var(--text-secondary);
}

.article-content li {
  margin-bottom: 0.45rem;
  line-height: 1.75;
}

.article-cta-inline {
  margin: 1.8rem 0;
  padding: 1.35rem 1.5rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(16, 36, 78, 0.9), rgba(8, 18, 40, 0.95));
  border: 1px solid rgba(255, 241, 168, 0.35);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.article-cta-inline p {
  margin: 0;
  font-size: 0.94rem;
  color: var(--text-primary);
}

.article-pager {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.pager-link {
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  background: rgba(8, 14, 30, 0.8);
  border: 1px solid var(--border-subtle);
  display: block;
}

.pager-link:hover {
  border-color: var(--cyan);
}

.pager-link span {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.pager-link strong {
  color: var(--text-primary);
  font-size: 0.93rem;
}

.article-sidebar {
  display: grid;
  gap: 1.25rem;
  position: sticky;
  top: 92px;
}

.sidebar-card {
  padding: 1.35rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface-strong);
  border: 1px solid var(--border-subtle);
}

.sidebar-card h3 {
  margin: 0 0 0.85rem;
  font-size: 1.04rem;
  color: var(--cyan);
}

.sidebar-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
  font-size: 0.9rem;
}

.sidebar-list a {
  color: var(--text-secondary);
  display: block;
  line-height: 1.45;
}

.sidebar-list a:hover {
  color: var(--cyan);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 1024px) {
  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-sidebar {
    position: static;
  }

  .grid-4,
  .ext-links-grid,
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .reviews-grid,
  .steps-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .nav-toggle-label {
    display: inline-flex;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.2rem;
    padding: 1rem 1.25rem 1.25rem;
    background: rgba(6, 11, 24, 0.98);
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: 0 22px 40px rgba(0, 0, 0, 0.65);
  }

  .main-nav a {
    width: 100%;
    padding: 0.6rem 0.4rem;
    border-bottom: 1px solid rgba(112, 165, 255, 0.08);
  }

  .nav-toggle-input:checked ~ .main-nav {
    display: flex;
  }
}

@media (max-width: 760px) {
  .app-tile {
    width: 52px;
    height: 52px;
    border-radius: 13px;
  }
  .app-tile svg {
    width: 20px;
    height: 20px;
  }
  .app-tile span {
    font-size: 8px;
  }
  .app-tile:nth-child(n+10) {
    display: none;
  }

  /* Keep all pricing cards strictly in the same horizontal row (同排) on mobile too */
  .pricing-scroll-hint {
    display: block;
  }

  .pricing-row {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: minmax(272px, 84%);
    overflow-x: auto;
    padding-bottom: 0.85rem;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
  }

  .plan-card {
    scroll-snap-align: start;
  }

  .articles-grid,
  .grid-4,
  .grid-3,
  .grid-2,
  .reviews-grid,
  .steps-grid,
  .ext-links-grid,
  .footer-grid,
  .article-pager,
  .hero-metrics {
    grid-template-columns: 1fr;
  }

  .article-main {
    padding: 1.45rem 1.2rem;
  }
}