/* ==========================================================================
   仙路湾官网 (XIANLUWAN) · Black Titanium 黑钛旗舰设计系统
   Domain: https://xianluwanvpn.click
   ========================================================================== */

@property --rim-angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

:root {
  --bg-void: #050507;
  --bg-deep: #090a0e;
  --bg-graphite: #101218;
  --bg-titanium: #161922;
  --bg-elevated: rgba(20, 23, 31, 0.78);
  --bg-glass: rgba(12, 14, 19, 0.76);

  --border-hairline: rgba(215, 224, 240, 0.11);
  --border-silver: rgba(226, 234, 248, 0.26);
  --silver-sheen: rgba(232, 240, 255, 0.65);

  --text-primary: #f4f6fa;
  --text-secondary: #adb6c6;
  --text-muted: #70798c;

  --accent-cyan: #52e5f5;
  --accent-cyan-soft: rgba(82, 229, 245, 0.16);
  --accent-amber: #f59c3d;
  --accent-amber-soft: rgba(245, 156, 61, 0.16);
  --accent-violet: #7b61ff;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-xl: 28px;

  --max-width: 1200px;
  --nav-height: 72px;
  --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-void);
  color: var(--text-primary);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  line-height: 1.7;
  color: var(--text-primary);
  background:
    radial-gradient(1100px 600px at 15% -5%, rgba(165, 185, 215, 0.08), transparent 60%),
    radial-gradient(900px 550px at 85% 10%, rgba(82, 229, 245, 0.06), transparent 65%),
    radial-gradient(1200px 700px at 50% 100%, rgba(245, 156, 61, 0.04), transparent 70%),
    var(--bg-void);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Subtle brushed-titanium noise & micro-grid layer */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 85% 75% at 50% 20%, #000 35%, transparent 100%);
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition), transform var(--transition);
}

button {
  font-family: inherit;
  cursor: pointer;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.section {
  position: relative;
  padding: 96px 0;
  scroll-margin-top: 84px;
}

section[id] {
  scroll-margin-top: 84px;
}

.section-compact {
  padding: 64px 0;
}

.section-divider {
  border-top: 1px solid var(--border-hairline);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.015) 0%, transparent 120px);
}

/* ==========================================================================
   Typography & Section Headers
   ========================================================================== */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #d6deec;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(215, 226, 245, 0.16);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}

.section-header {
  max-width: 740px;
  margin: 0 auto 56px;
  text-align: center;
}

.section-header .eyebrow {
  margin-bottom: 16px;
}

.section-title {
  margin: 0 0 16px;
  font-size: clamp(1.85rem, 3.6vw, 2.75rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, #ffffff 0%, #cfd7e6 55%, #8e98aa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-subtitle {
  margin: 0;
  font-size: 1.04rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ==========================================================================
   Black Titanium Edge Contour Glow (产品边缘轮廓光)
   ========================================================================== */

.titanium-card {
  position: relative;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(26, 29, 38, 0.84) 0%, rgba(11, 13, 18, 0.94) 100%);
  border: 1px solid var(--border-hairline);
  box-shadow:
    0 20px 50px rgba(0, 0, 0, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
  --mx: 50%;
  --my: 50%;
}

/* Subtle metallic pointer-reactive edge contour ring */
.titanium-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1.25px;
  background: radial-gradient(
    420px circle at var(--mx) var(--my),
    rgba(236, 244, 255, 0.55),
    rgba(82, 229, 245, 0.25) 35%,
    rgba(255, 255, 255, 0.06) 70%,
    transparent 100%
  );
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0.42;
  transition: opacity var(--transition);
}

.titanium-card:hover {
  transform: translateY(-4px);
  border-color: rgba(226, 234, 248, 0.24);
  box-shadow:
    0 28px 65px rgba(0, 0, 0, 0.7),
    0 0 32px rgba(190, 210, 240, 0.07),
    inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

.titanium-card:hover::before {
  opacity: 1;
}

/* Continuous ambient animated rim contour for flagship cards */
.titanium-rim-animated {
  position: relative;
}

.titanium-rim-animated::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1.5px;
  background: conic-gradient(
    from var(--rim-angle),
    transparent 0deg,
    rgba(225, 236, 255, 0.08) 55deg,
    rgba(235, 244, 255, 0.72) 95deg,
    rgba(82, 229, 245, 0.45) 120deg,
    rgba(245, 156, 61, 0.35) 145deg,
    rgba(225, 236, 255, 0.08) 185deg,
    transparent 360deg
  );
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  animation: rimSweep 7.5s linear infinite;
}

@keyframes rimSweep {
  to {
    --rim-angle: 360deg;
  }
}

/* ==========================================================================
   Buttons & CTAs
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  color: #07080b;
  background: linear-gradient(135deg, #ffffff 0%, #dce4f0 48%, #b9c4d6 100%);
  border-color: rgba(255, 255, 255, 0.6);
  box-shadow:
    0 10px 30px rgba(210, 225, 250, 0.16),
    inset 0 1px 0 #ffffff;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow:
    0 14px 36px rgba(220, 235, 255, 0.28),
    0 0 24px rgba(82, 229, 245, 0.22);
}

.btn-amber {
  color: #fff8f0;
  background: linear-gradient(180deg, rgba(38, 28, 18, 0.95) 0%, rgba(16, 12, 9, 0.98) 100%);
  border: 1.5px solid #e68224;
  box-shadow:
    0 0 20px rgba(245, 156, 61, 0.25),
    inset 0 1px 0 rgba(255, 200, 140, 0.22);
}

.btn-amber:hover {
  background: linear-gradient(135deg, #f59c3d 0%, #e07618 100%);
  color: #080705;
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(245, 156, 61, 0.38);
}

.btn-secondary {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(215, 226, 245, 0.18);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(235, 244, 255, 0.42);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.875rem;
  border-radius: 10px;
}

/* ==========================================================================
   Navigation Header & Mobile Drawer
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(6, 7, 10, 0.78);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(215, 224, 240, 0.09);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 20px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid rgba(210, 225, 245, 0.28);
  box-shadow: 0 0 18px rgba(82, 229, 245, 0.18);
  object-fit: cover;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.brand-sub {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 11px;
  border-radius: 8px;
  white-space: nowrap;
  cursor: pointer;
}

.nav-links a:hover,
.nav-links a.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.05);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 2px;
  height: 1.5px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), #dce6f7, transparent);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
}

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

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(215, 224, 240, 0.16);
  color: var(--text-primary);
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: rgba(9, 10, 14, 0.97);
  backdrop-filter: blur(22px);
  border-bottom: 1px solid var(--border-silver);
  padding: 20px 24px 28px;
  z-index: 99;
}

.mobile-drawer.open {
  display: block;
}

.mobile-drawer ul {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-drawer li a {
  display: block;
  padding: 12px 14px;
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
}

.mobile-drawer li a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
}

/* ==========================================================================
   Hero Showcase (沉浸式品牌展示)
   ========================================================================== */

.hero {
  position: relative;
  padding: 72px 0 88px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 48px;
  align-items: center;
}

.hero-title {
  margin: 18px 0 18px;
  font-size: clamp(2.25rem, 4.7vw, 3.65rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.025em;
  background: linear-gradient(175deg, #ffffff 10%, #dce3ef 58%, #8f9bb0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle-brand {
  display: block;
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  font-weight: 500;
  color: var(--accent-cyan);
  margin-top: 10px;
  letter-spacing: 0.04em;
  background: none;
  -webkit-text-fill-color: currentColor;
}

.hero-desc {
  margin: 0 0 28px;
  font-size: 1.06rem;
  color: var(--text-secondary);
  max-width: 58ch;
  line-height: 1.8;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 34px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  max-width: 540px;
}

.metric-chip {
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-hairline);
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.metric-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Flagship Black Titanium Showcase Stage */
.hero-stage {
  position: relative;
  padding: 28px;
}

.stage-glow {
  position: absolute;
  inset: -12%;
  background:
    radial-gradient(circle at 35% 30%, rgba(82, 229, 245, 0.14), transparent 52%),
    radial-gradient(circle at 75% 75%, rgba(245, 156, 61, 0.12), transparent 55%);
  filter: blur(28px);
  z-index: 0;
  pointer-events: none;
}

.stage-chassis {
  position: relative;
  z-index: 1;
  padding: 28px;
  border-radius: var(--radius-xl);
  background: linear-gradient(155deg, rgba(24, 27, 36, 0.92), rgba(8, 9, 13, 0.98));
  border: 1px solid rgba(220, 232, 250, 0.22);
  box-shadow:
    0 30px 70px rgba(0, 0, 0, 0.8),
    inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

.stage-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.stage-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #b7f5db;
  font-weight: 600;
}

.status-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #38e59b;
  box-shadow: 0 0 12px #38e59b;
  animation: pulseDot 2.2s ease-in-out infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.stage-logo-wrap {
  display: flex;
  justify-content: center;
  padding: 24px 0 20px;
}

.stage-logo {
  width: 205px;
  height: 205px;
  border-radius: 28px;
  border: 1px solid rgba(205, 224, 245, 0.25);
  box-shadow:
    0 20px 45px rgba(0, 0, 0, 0.75),
    0 0 36px rgba(82, 229, 245, 0.14);
  object-fit: cover;
}

.node-telemetry-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 8px;
}

.node-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 0.82rem;
}

.node-pill span:first-child {
  color: var(--text-secondary);
}

.node-ping {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  font-weight: 600;
}

/* ==========================================================================
   Product Close-Up Showcase (产品特写)
   ========================================================================== */

.closeup-layout {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 32px;
  align-items: stretch;
}

.closeup-tabs {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.closeup-tab {
  text-align: left;
  padding: 22px 24px;
  border-radius: var(--radius-md);
  background: rgba(18, 20, 27, 0.55);
  border: 1px solid var(--border-hairline);
  color: var(--text-secondary);
  transition: all var(--transition);
}

.closeup-tab:hover {
  border-color: rgba(226, 234, 248, 0.24);
  background: rgba(24, 27, 36, 0.78);
}

.closeup-tab.active {
  background: linear-gradient(145deg, rgba(28, 32, 43, 0.94), rgba(14, 16, 22, 0.96));
  border-color: rgba(226, 234, 248, 0.4);
  color: var(--text-primary);
  box-shadow:
    0 14px 36px rgba(0, 0, 0, 0.45),
    0 0 24px rgba(82, 229, 245, 0.08);
}

.closeup-tab-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  margin-bottom: 6px;
  letter-spacing: 0.08em;
}

.closeup-tab h3 {
  margin: 0 0 6px;
  font-size: 1.12rem;
  color: var(--text-primary);
}

.closeup-tab p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.closeup-viewport {
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.closeup-panel {
  display: none;
  animation: fadePanel 0.35s ease;
}

.closeup-panel.active {
  display: block;
}

@keyframes fadePanel {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.terminal-frame {
  margin-top: 20px;
  padding: 18px 20px;
  border-radius: 14px;
  background: #07080b;
  border: 1px solid rgba(215, 224, 240, 0.14);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: #cbd5e6;
  line-height: 1.7;
  overflow-x: auto;
}

.terminal-line-ok { color: #4ce7a5; }
.terminal-line-cyan { color: var(--accent-cyan); }
.terminal-line-amber { color: var(--accent-amber); }

.spec-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.spec-box {
  padding: 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
}

.spec-box strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.spec-box span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Feature Grid (功能优势)
   ========================================================================== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.feature-card {
  padding: 28px 26px;
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(226, 234, 248, 0.18);
  color: #e4ebf7;
  font-size: 1.25rem;
}

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 1.14rem;
  font-weight: 600;
  color: var(--text-primary);
}

.feature-card p {
  margin: 0;
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.72;
}

/* ==========================================================================
   Pricing Section (套餐价格 - 黑钛质感与图片方案精确还原)
   ========================================================================== */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  align-items: stretch;
  margin-bottom: 48px;
}

.pricing-card {
  padding: 36px 28px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background:
    radial-gradient(circle at 50% 105%, rgba(245, 156, 61, 0.12), transparent 52%),
    linear-gradient(170deg, rgba(24, 27, 36, 0.9) 0%, rgba(10, 11, 16, 0.98) 100%);
}

.pricing-card.featured {
  border-color: rgba(145, 160, 255, 0.42);
  background:
    radial-gradient(circle at 50% 0%, rgba(123, 97, 255, 0.18), transparent 50%),
    radial-gradient(circle at 50% 105%, rgba(245, 156, 61, 0.16), transparent 55%),
    linear-gradient(170deg, rgba(26, 30, 44, 0.95) 0%, rgba(10, 12, 18, 0.99) 100%);
  transform: translateY(-6px);
}

.pricing-card.featured:hover {
  transform: translateY(-10px);
}

.pricing-badge {
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #ffffff;
  background: linear-gradient(135deg, #6d5dfc 0%, #4b83ff 100%);
  box-shadow: 0 4px 16px rgba(109, 93, 252, 0.45);
}

.pricing-name {
  margin: 14px 0 18px;
  text-align: center;
  font-size: 1.16rem;
  font-weight: 600;
  color: #e8eef9;
}

.pricing-amount {
  text-align: center;
  margin-bottom: 24px;
  font-family: var(--font-mono);
}

.pricing-currency {
  font-size: 2.35rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
}

.pricing-period {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.pricing-note {
  display: block;
  margin-top: 4px;
  font-size: 0.78rem;
  color: var(--accent-cyan);
  font-family: var(--font-sans);
}

.pricing-list {
  list-style: none;
  padding: 0;
  margin: 0 0 30px;
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.pricing-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-secondary);
}

.pricing-check {
  color: #5499ff;
  font-weight: 700;
  flex-shrink: 0;
}

.pricing-cta {
  width: 100%;
  margin-top: auto;
}

/* Comparison Table for SEO/GEO & quick decision */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-hairline);
  background: rgba(12, 14, 20, 0.85);
}

.geo-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
  font-size: 0.92rem;
}

.geo-table th,
.geo-table td {
  padding: 15px 18px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.geo-table th {
  color: var(--text-primary);
  font-weight: 600;
  background: rgba(255, 255, 255, 0.03);
}

.geo-table td {
  color: var(--text-secondary);
}

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

/* ==========================================================================
   About Brand Section (关于仙路湾)
   ========================================================================== */

.about-box {
  padding: 46px 42px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.about-content h2 {
  margin: 14px 0 12px;
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  color: var(--text-primary);
}

.about-lead {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin: 0 0 18px;
}

.about-content p {
  margin: 0 0 14px;
  color: var(--text-secondary);
  line-height: 1.82;
}

.about-signature {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border-hairline);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.about-visual {
  padding: 28px;
  border-radius: var(--radius-md);
  background: rgba(8, 9, 13, 0.86);
  border: 1px solid rgba(215, 224, 240, 0.14);
  text-align: center;
}

.about-visual img {
  width: 170px;
  height: 170px;
  margin: 0 auto 18px;
  border-radius: 22px;
  border: 1px solid rgba(215, 224, 240, 0.22);
}

.about-pillars {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
  text-align: left;
}

.pillar-item {
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.pillar-item strong {
  display: block;
  color: var(--text-primary);
  margin-bottom: 2px;
}

/* ==========================================================================
   Articles & Knowledge Base Hub (6篇核心文章与内部跳转)
   ========================================================================== */

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.article-card {
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-keyword-tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: var(--accent-cyan-soft);
  border: 1px solid rgba(82, 229, 245, 0.24);
  margin-bottom: 14px;
}

.article-card h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
  line-height: 1.45;
  color: var(--text-primary);
}

.article-card p {
  margin: 0 0 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-hairline);
  font-size: 0.84rem;
  color: var(--text-muted);
}

.article-read-link {
  color: var(--text-primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-card:hover .article-read-link {
  color: var(--accent-cyan);
}

/* ==========================================================================
   Reviews & FAQ (用户评价 & 常见问题)
   ========================================================================== */

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.review-card {
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  color: var(--accent-amber);
  font-size: 0.95rem;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.review-quote {
  margin: 0 0 20px;
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.review-author {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-hairline);
  font-size: 0.84rem;
}

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

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

.faq-list {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(22, 25, 34, 0.85), rgba(11, 13, 18, 0.95));
  border: 1px solid var(--border-hairline);
  transition: border-color var(--transition);
}

.faq-item[open] {
  border-color: rgba(226, 234, 248, 0.34);
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 24px;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--text-secondary);
  transition: transform 0.25s ease;
}

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

.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.faq-answer a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ==========================================================================
   Dedicated Article Page Layout (文章页排版与内部跳转)
   ========================================================================== */

.article-shell {
  padding: 44px 0 88px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

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

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 36px;
  align-items: start;
}

.article-main {
  padding: 38px 40px;
}

.article-main h1 {
  margin: 14px 0 16px;
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  line-height: 1.3;
  color: var(--text-primary);
}

.article-info-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 20px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--border-hairline);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.tldr-box {
  padding: 18px 22px;
  border-radius: 14px;
  background: rgba(82, 229, 245, 0.06);
  border: 1px solid rgba(82, 229, 245, 0.24);
  margin-bottom: 28px;
}

.tldr-box strong {
  display: block;
  color: var(--accent-cyan);
  margin-bottom: 6px;
  font-size: 0.92rem;
}

.tldr-box p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.article-prose h2 {
  margin: 34px 0 14px;
  font-size: 1.38rem;
  color: var(--text-primary);
  padding-left: 12px;
  border-left: 3px solid var(--accent-cyan);
}

.article-prose h3 {
  margin: 24px 0 10px;
  font-size: 1.12rem;
  color: #e4ebf7;
}

.article-prose p {
  margin: 0 0 16px;
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.9;
}

.article-prose ul,
.article-prose ol {
  margin: 0 0 18px;
  padding-left: 22px;
  color: var(--text-secondary);
  line-height: 1.85;
}

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

.article-prose a.inline-link {
  color: var(--accent-cyan);
  border-bottom: 1px dashed rgba(82, 229, 245, 0.45);
}

.article-prose a.inline-link:hover {
  color: #ffffff;
  border-bottom-color: #ffffff;
}

.article-inline-cta {
  margin: 34px 0 10px;
  padding: 24px 26px;
  border-radius: var(--radius-md);
  background:
    radial-gradient(circle at 90% 20%, rgba(245, 156, 61, 0.14), transparent 55%),
    rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(230, 130, 36, 0.45);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.article-inline-cta h3 {
  margin: 0 0 4px;
  font-size: 1.08rem;
  color: var(--text-primary);
}

.article-inline-cta p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: 94px;
}

.sidebar-card {
  padding: 22px;
}

.sidebar-card h3 {
  margin: 0 0 14px;
  font-size: 1rem;
  color: var(--text-primary);
}

.sidebar-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-links a {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.87rem;
  color: var(--text-secondary);
}

.sidebar-links a:hover,
.sidebar-links a.current {
  background: rgba(82, 229, 245, 0.08);
  border-color: rgba(82, 229, 245, 0.3);
  color: var(--text-primary);
}

.related-articles-block {
  margin-top: 40px;
}

.related-articles-block h2 {
  margin: 0 0 20px;
  font-size: 1.45rem;
}

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

.cta-banner {
  padding: 52px 40px;
  text-align: center;
  background:
    radial-gradient(circle at 50% 0%, rgba(82, 229, 245, 0.14), transparent 55%),
    radial-gradient(circle at 50% 100%, rgba(245, 156, 61, 0.12), transparent 55%),
    linear-gradient(160deg, rgba(22, 25, 34, 0.94), rgba(9, 10, 14, 0.98));
}

.cta-banner h2 {
  margin: 0 0 12px;
  font-size: clamp(1.6rem, 3vw, 2.25rem);
}

.cta-banner p {
  margin: 0 auto 28px;
  max-width: 60ch;
  color: var(--text-secondary);
}

.site-footer {
  border-top: 1px solid var(--border-hairline);
  background: #040406;
  padding: 64px 0 36px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.85fr 1fr 0.9fr;
  gap: 32px;
  margin-bottom: 44px;
}

.footer-col h4 {
  margin: 0 0 16px;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Scroll Reveal & Mobile Responsiveness
   ========================================================================== */

.js-reveal .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

.js-reveal .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1080px) {
  .nav-links,
  .nav-actions .btn-secondary {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
  }
}

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

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

  .pricing-card.featured {
    transform: none;
  }

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

  .article-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .hero {
    padding: 44px 0 60px;
  }

  .hero-metrics,
  .spec-row,
  .features-grid,
  .pricing-grid,
  .articles-grid,
  .reviews-grid,
  .footer-grid,
  .about-pillars {
    grid-template-columns: 1fr;
  }

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

  .stage-chassis,
  .about-box,
  .article-main,
  .cta-banner {
    padding: 24px 20px;
  }

  .node-telemetry-list {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 0 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .titanium-rim-animated::after,
  .status-pulse {
    animation: none;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}