/* ==========================================================================
   瞬云 SHUNYUN.SBS - 全球高奢全息液态金属科技落地页样式规范
   ========================================================================== */

:root {
  --bg-primary: #06040b;
  --bg-secondary: #0c0816;
  --bg-elevated: #130e22;
  --bg-glass: rgba(17, 12, 30, 0.65);
  --bg-glass-heavy: rgba(12, 8, 22, 0.85);
  --bg-glass-light: rgba(255, 255, 255, 0.03);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow-purple: rgba(168, 85, 247, 0.4);
  --border-glow-cyan: rgba(6, 182, 212, 0.4);
  --border-chrome: rgba(226, 232, 240, 0.25);

  --accent-purple: #a855f7;
  --accent-purple-glow: rgba(168, 85, 247, 0.5);
  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.5);
  --accent-chrome: #e2e8f0;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --text-pure: #ffffff;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 35px -5px rgba(168, 85, 247, 0.35);
  --shadow-cyan-glow: 0 0 35px -5px rgba(6, 182, 212, 0.35);

  --transition-base: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background: radial-gradient(circle at 50% 0%, #170d2c 0%, #0c0816 45%, #06040b 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 宇宙星雾与微光光斑背景 */
.cosmic-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.nebula-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.28;
  animation: floatOrb 18s ease-in-out infinite alternate;
}

.orb-purple {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, #9333ea, transparent 70%);
  top: -10%;
  right: 15%;
}

.orb-cyan {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #0891b2, transparent 70%);
  top: 25%;
  left: -8%;
  animation-delay: -5s;
}

.orb-silver {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #64748b, transparent 70%);
  bottom: 10%;
  right: -5%;
  animation-delay: -10s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.08); }
  100% { transform: translate(-30px, 40px) scale(0.95); }
}

/* 极细网格纹理底纹 */
.cyber-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(circle at 50% 50%, black 50%, transparent 95%);
  -webkit-mask-image: radial-gradient(circle at 50% 50%, black 50%, transparent 95%);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   顶部 HUD 导航栏
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: var(--transition-base);
  padding: 18px 0;
}

.site-header.scrolled {
  background: var(--bg-glass-heavy);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 0;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-badge {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(168, 85, 247, 0.4));
  border: 1px solid rgba(255, 255, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 0 12px rgba(255, 255, 255, 0.3), 0 0 20px rgba(168, 85, 247, 0.4);
  position: relative;
  overflow: hidden;
}

.logo-badge::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.5) 50%, transparent 60%);
  animation: shine 4s infinite linear;
}

@keyframes shine {
  0% { transform: translateX(-100%) rotate(45deg); }
  20%, 100% { transform: translateX(100%) rotate(45deg); }
}

.logo-svg {
  width: 24px;
  height: 24px;
  fill: #fff;
  filter: drop-shadow(0 0 6px #06b6d4);
}

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

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(120deg, #ffffff 20%, #e2e8f0 50%, #a855f7 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-sub {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 32px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: var(--transition-base);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: #fff;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan));
  border-radius: 2px;
  transition: var(--transition-base);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ==========================================================================
   折射棱镜流光按钮 (Prism Refraction Buttons)
   ========================================================================== */
.btn-prism {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: 9999px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  color: #ffffff;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.25), rgba(6, 182, 212, 0.25));
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  cursor: pointer;
  overflow: hidden;
  box-shadow: 0 0 20px -5px rgba(168, 85, 247, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.4);
  transition: var(--transition-base);
}

.btn-prism::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    rgba(6, 182, 212, 0.5),
    rgba(168, 85, 247, 0.5),
    transparent
  );
  transform: skewX(-25deg);
  transition: 0.6s;
}

.btn-prism:hover {
  transform: translateY(-2px) scale(1.02);
  border-color: rgba(255, 255, 255, 0.6);
  box-shadow: 0 0 35px rgba(168, 85, 247, 0.7), 0 0 15px rgba(6, 182, 212, 0.5), inset 0 1px 3px #ffffff;
}

.btn-prism:hover::before {
  left: 150%;
}

.btn-secondary-ghost {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: 9999px;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  transition: var(--transition-base);
}

.btn-secondary-ghost:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.25);
  color: #fff;
  transform: translateY(-2px);
}

/* ==========================================================================
   Hero 首屏板块 (液态金属云与全息视差)
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 100vh;
  padding-top: 150px;
  padding-bottom: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-canvas-container {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  max-width: 1100px;
  height: 800px;
  pointer-events: auto;
  z-index: 1;
}

#liquid-chrome-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  pointer-events: none;
}

.hero-content * {
  pointer-events: auto;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 9999px;
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.35);
  backdrop-filter: blur(10px);
  margin-bottom: 24px;
}

.pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulseCyan 2s infinite ease-in-out;
}

@keyframes pulseCyan {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.pill-text {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  letter-spacing: 1px;
  text-transform: uppercase;
  font-weight: 600;
}

.hero-title {
  font-size: 4rem;
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}

.text-gradient-chrome {
  background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 30%, #a855f7 65%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 40px rgba(168, 85, 247, 0.3);
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 720px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.hero-hud-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
  padding: 24px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
}

.hud-stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
}

.hud-stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: var(--border-subtle);
}

.hud-stat-val {
  font-size: 1.85rem;
  font-weight: 800;
  font-family: var(--font-mono);
  background: linear-gradient(135deg, #fff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hud-stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

/* ==========================================================================
   通用板块标题与样式
   ========================================================================== */
.section-wrapper {
  padding: 100px 0;
  position: relative;
  z-index: 2;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--accent-purple);
  text-transform: uppercase;
  letter-spacing: 2.5px;
  margin-bottom: 12px;
  font-weight: 700;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  color: #fff;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   瀑布流排版核心 (Masonry Multi-Column CSS)
   ========================================================================== */
.masonry-waterfall {
  column-count: 3;
  column-gap: 28px;
  width: 100%;
}

@media (max-width: 1024px) {
  .masonry-waterfall {
    column-count: 2;
    column-gap: 20px;
  }
}

@media (max-width: 640px) {
  .masonry-waterfall {
    column-count: 1;
  }
}

.masonry-item {
  break-inside: avoid;
  page-break-inside: avoid;
  margin-bottom: 28px;
  transition: var(--transition-base);
}

/* ==========================================================================
   核心优势卡片 (Cinema 4D 磨砂液态金属质感)
   ========================================================================== */
.glass-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  padding: 32px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-sm);
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
}

.glass-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow-purple);
  box-shadow: 0 20px 40px -10px rgba(168, 85, 247, 0.25), inset 0 0 20px rgba(168, 85, 247, 0.05);
}

.card-icon-halo {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(6, 182, 212, 0.1));
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--accent-cyan);
  font-size: 1.5rem;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.25);
  transition: var(--transition-base);
}

.glass-card:hover .card-icon-halo {
  transform: scale(1.1) rotate(5deg);
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.35), rgba(6, 182, 212, 0.25));
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
  box-shadow: 0 0 25px rgba(168, 85, 247, 0.5);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}

.card-text {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.card-feature-list {
  list-style: none;
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-primary);
}

.check-bullet {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.2);
  color: var(--accent-emerald);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: bold;
}

/* ==========================================================================
   节点延迟与遥测状态板块
   ========================================================================== */
.telemetry-container {
  background: var(--bg-glass-heavy);
  border: 1px solid var(--border-subtle);
  border-radius: 28px;
  padding: 40px;
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  box-shadow: var(--shadow-lg);
}

.telemetry-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 16px;
}

.telemetry-status-summary {
  display: flex;
  align-items: center;
  gap: 24px;
}

.status-indicator-live {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--accent-emerald);
}

.pulse-green {
  width: 10px;
  height: 10px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulseGreen 1.8s infinite;
}

@keyframes pulseGreen {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.5; }
}

.btn-refresh-ping {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 0.88rem;
  cursor: pointer;
  transition: var(--transition-base);
}

.btn-refresh-ping:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-cyan);
  color: #fff;
}

.node-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.node-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 18px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: var(--transition-base);
  position: relative;
}

.node-card:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(6, 182, 212, 0.4);
  transform: translateY(-3px);
}

.node-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-location {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-flag {
  font-size: 1.4rem;
}

.node-name {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}

.node-type-tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: var(--accent-purple);
}

.node-metrics {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0.25);
  padding: 10px 14px;
  border-radius: 10px;
}

.metric-col {
  display: flex;
  flex-direction: column;
}

.metric-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.metric-val {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
}

.ping-fast {
  color: var(--accent-emerald);
}

.ping-medium {
  color: var(--accent-cyan);
}

.ping-stable {
  color: var(--accent-purple);
}

.node-load-bar-wrap {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
}

.node-load-bar {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
  transition: width 0.8s ease-in-out;
}

/* ==========================================================================
   套餐价格板块 (Pricing High-End Grid)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

@media (max-width: 1100px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .pricing-grid {
    grid-template-columns: 1fr;
  }
}

.price-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: var(--transition-smooth);
}

.price-card.featured {
  background: linear-gradient(180deg, rgba(26, 17, 46, 0.9) 0%, rgba(15, 10, 27, 0.9) 100%);
  border: 1px solid var(--border-glow-purple);
  box-shadow: 0 0 35px rgba(168, 85, 247, 0.25);
  transform: scale(1.04);
}

.price-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, 0.35);
  box-shadow: var(--shadow-lg);
}

.price-card.featured:hover {
  transform: scale(1.04) translateY(-6px);
  box-shadow: 0 20px 45px rgba(168, 85, 247, 0.4);
}

.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 4px 16px;
  border-radius: 999px;
  box-shadow: 0 4px 15px rgba(168, 85, 247, 0.5);
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  min-height: 42px;
  margin-bottom: 24px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

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

.amount {
  font-size: 2.8rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: #fff;
  line-height: 1;
}

.period {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 36px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.plan-feature-item .icon {
  color: var(--accent-cyan);
  font-size: 0.95rem;
}

.btn-plan {
  width: 100%;
  text-align: center;
  padding: 14px;
  border-radius: 14px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition-base);
}

.btn-plan-featured {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  color: #fff;
  box-shadow: 0 4px 20px rgba(168, 85, 247, 0.4);
}

.btn-plan-featured:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(168, 85, 247, 0.6);
}

.btn-plan-normal {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: #fff;
}

.btn-plan-normal:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

/* ==========================================================================
   用户评价板块 (瀑布流不等高卡片)
   ========================================================================== */
.review-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 26px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition: var(--transition-base);
}

.review-card:hover {
  border-color: var(--border-glow-cyan);
  transform: translateY(-4px);
  box-shadow: 0 15px 30px -10px rgba(6, 182, 212, 0.25);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.review-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.review-meta {
  display: flex;
  flex-direction: column;
}

.review-author {
  font-size: 0.98rem;
  font-weight: 700;
  color: #fff;
}

.review-role {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.review-stars {
  color: #facc15;
  font-size: 0.85rem;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.review-content {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
}

.review-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

/* ==========================================================================
   常见问题解答 (FAQ Accordion)
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  overflow: hidden;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.faq-trigger {
  width: 100%;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: var(--transition-base);
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
  fill: var(--text-secondary);
}

.faq-item.open .faq-icon-arrow {
  transform: rotate(180deg);
  fill: var(--accent-cyan);
}

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

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
  padding: 0 28px;
}

.faq-item.open .faq-body {
  max-height: 400px;
  padding: 0 28px 24px;
}

.faq-body-content {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   知识库与教程板块 (8篇深度文章卡片瀑布流)
   ========================================================================== */
.article-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 22px;
  padding: 28px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow-purple);
  box-shadow: 0 20px 40px -10px rgba(168, 85, 247, 0.3);
}

.article-category-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--accent-purple);
  text-transform: uppercase;
  padding: 3px 10px;
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.25);
  border-radius: 6px;
  margin-bottom: 14px;
  align-self: flex-start;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-snippet {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.article-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-cyan);
  text-decoration: none;
  transition: var(--transition-base);
}

.article-link-btn:hover {
  color: #fff;
  transform: translateX(4px);
}

/* ==========================================================================
   全站页脚 (High-End Footer)
   ========================================================================== */
.site-footer {
  background: #040308;
  border-top: 1px solid var(--border-subtle);
  padding: 80px 0 40px;
  position: relative;
  z-index: 2;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

@media (max-width: 900px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 580px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
}

.footer-about {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 360px;
}

.footer-about-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  transition: var(--transition-base);
}

.footer-link:hover {
  color: var(--accent-cyan);
  transform: translateX(3px);
}

.seo-keywords-tagcloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.seo-tag {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 响应式汉堡菜单与移动端抽屉 */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 860px) {
  .nav-menu {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-title {
    font-size: 2.6rem;
  }
  .hero-hud-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}