/* ===================================================================
   熊猫cloud机场 (pandacloudjc.click) - Nocturne Glass 视觉系统
   设计理念：玻璃无色，色彩属于夜景 (Image 1 Nocturne Glass 灵感)
   全站暗调玻璃拟态、极光光晕、高精工程排版、移动端全自适应
   =================================================================== */

:root {
  --bg-primary: #07090e;
  --bg-secondary: #0c101a;
  --bg-tertiary: #111726;
  --bg-card: rgba(16, 23, 38, 0.72);
  --bg-card-hover: rgba(23, 33, 54, 0.82);
  --bg-glass-input: rgba(10, 15, 26, 0.65);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.14);
  --border-glow: rgba(56, 189, 248, 0.35);
  --border-amber: rgba(245, 158, 11, 0.38);

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  --text-inverse: #07090e;

  --accent-cyan: #38bdf8;
  --accent-indigo: #6366f1;
  --accent-amber: #f59e0b;
  --accent-amber-light: #fbbf24;
  --accent-orange: #ff7a18;
  --accent-emerald: #10b981;
  --accent-emerald-light: #34d399;
  --accent-rose: #f43f5e;

  --shadow-glass: 0 16px 40px -12px rgba(0, 0, 0, 0.6), 0 0 1px 1px rgba(255, 255, 255, 0.07);
  --shadow-glow: 0 0 30px -5px rgba(56, 189, 248, 0.25);
  --shadow-glow-amber: 0 0 35px -5px rgba(255, 122, 24, 0.32);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  scroll-behavior: smooth;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  min-height: 100vh;
}

/* ===================================================================
   Ambient Nocturne Background & Lighting
   =================================================================== */
.ambient-backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 30%, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, black 20%, transparent 80%);
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.25;
  will-change: transform;
  animation: floatOrb 18s ease-in-out infinite alternate;
}

.ambient-orb--cyan {
  width: 550px;
  height: 550px;
  top: -120px;
  left: 15%;
  background: radial-gradient(circle, #38bdf8 0%, rgba(56, 189, 248, 0) 70%);
}

.ambient-orb--indigo {
  width: 650px;
  height: 650px;
  top: 30%;
  right: -100px;
  background: radial-gradient(circle, #6366f1 0%, rgba(99, 102, 241, 0) 70%);
  animation-duration: 24s;
}

.ambient-orb--amber {
  width: 480px;
  height: 480px;
  bottom: 10%;
  left: 5%;
  background: radial-gradient(circle, #f59e0b 0%, rgba(245, 158, 11, 0) 70%);
  animation-duration: 20s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, 40px) scale(1.08); }
  100% { transform: translate(-20px, 25px) scale(0.95); }
}

/* ===================================================================
   Container & Typography Helpers
   =================================================================== */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 86px 0;
  position: relative;
}

.section-alt {
  background: linear-gradient(180deg, rgba(12, 16, 26, 0.4) 0%, rgba(17, 23, 38, 0.7) 100%);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 56px auto;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.22);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.85rem, 3.2vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #ffffff;
  line-height: 1.25;
  margin-bottom: 18px;
}

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

/* ===================================================================
   Header & Navigation (图1 风格：首页 优势 套餐 文章知识库 常见问题 免费注册)
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(7, 9, 14, 0.78);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #ffffff;
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: -0.01em;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(245, 158, 11, 0.2));
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.brand-domain-pill {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.07);
  color: var(--accent-cyan);
  border: 1px solid var(--border-subtle);
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.94rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.06);
}

.nav-cta-btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 20px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  color: #ffffff;
  background: linear-gradient(135deg, #f59e0b 0%, #ff7a18 100%);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 16px rgba(255, 122, 24, 0.35);
  transition: all var(--transition-fast);
}

.nav-cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 22px rgba(255, 122, 24, 0.5);
  filter: brightness(1.08);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  padding: 8px;
  cursor: pointer;
}

/* ===================================================================
   Buttons & Nocturne Glass Aesthetic (Fig. 1 Button)
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 28px;
  font-size: 0.96rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #ff7a18 0%, #ea580c 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 8px 24px -4px rgba(255, 122, 24, 0.45);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px -4px rgba(255, 122, 24, 0.65);
  filter: brightness(1.08);
}

/* Nocturne Button Style matching Image 1: Golden rim + slate glass core */
.btn-nocturne {
  background: rgba(38, 38, 36, 0.65);
  color: #f3dfb5;
  border: 1px solid #6b5c3e;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 4px 14px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.btn-nocturne:hover {
  background: rgba(52, 50, 44, 0.85);
  border-color: #a38957;
  color: #fff1d4;
  transform: translateY(-2px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 6px 20px rgba(163, 137, 87, 0.35);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  color: #ffffff;
  transform: translateY(-2px);
}

/* ===================================================================
   Hero Section
   =================================================================== */
.hero-section {
  padding: 80px 0 100px 0;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.hero-content {
  max-width: 650px;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--accent-cyan);
  font-size: 0.86rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 12px var(--accent-emerald);
  animation: pulseAnim 2s infinite;
}

@keyframes pulseAnim {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}

.hero-title {
  font-size: clamp(2.3rem, 4.4vw, 3.6rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.025em;
  color: #ffffff;
  margin-bottom: 22px;
}

.hero-title-gradient {
  background: linear-gradient(135deg, #ffffff 30%, #38bdf8 70%, #f59e0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.12rem;
  line-height: 1.75;
  color: var(--text-muted);
  margin-bottom: 34px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
}

.metric-num {
  font-size: 1.7rem;
  font-weight: 800;
  color: #ffffff;
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.metric-num span {
  color: var(--accent-cyan);
}

.metric-label {
  font-size: 0.82rem;
  color: var(--text-faint);
  margin-top: 4px;
}

/* ===================================================================
   Fig. 1 Nocturne Glass Portal Card (Hero Right)
   =================================================================== */
.hero-glass-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xl);
  padding: 34px;
  box-shadow: var(--shadow-glass);
  overflow: hidden;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.hero-glass-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.22);
}

.glass-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}

.glass-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--accent-cyan);
}

.glass-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

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

.node-status-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.node-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: rgba(10, 15, 26, 0.6);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.node-status-row:hover {
  background: rgba(18, 26, 44, 0.85);
  border-color: var(--border-light);
}

.node-row-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-flag-tag {
  font-size: 0.82rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
}

.node-row-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
}

.node-row-proto {
  font-size: 0.75rem;
  color: var(--text-faint);
  margin-left: 6px;
}

.node-ping-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: ui-monospace, SFMono-Regular, monospace;
  color: var(--accent-emerald-light);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.glass-card-cta-full {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-size: 0.96rem;
  font-weight: 600;
  color: #ffffff;
  background: linear-gradient(135deg, #f59e0b 0%, #ff7a18 100%);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 24px -4px rgba(255, 122, 24, 0.4);
  transition: all var(--transition-fast);
}

.glass-card-cta-full:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -4px rgba(255, 122, 24, 0.6);
}

/* ===================================================================
   Core Advantages Section
   =================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 26px;
}

.advantage-card {
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.advantage-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.4), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.advantage-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-light);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glass);
}

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

.adv-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  margin-bottom: 20px;
}

.adv-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
  line-height: 1.4;
}

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

/* ===================================================================
   Pricing Section (严格按照图2定制：月付¥11.95/年付¥5.99/两年付¥3.99)
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: #0f1523;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 20px 45px -10px rgba(0, 0, 0, 0.7);
}

/* 年付套餐：最受欢迎 (图2中间高亮橙框与橙色按钮) */
.pricing-card.featured {
  border: 2px solid #ff7a18;
  background: #111828;
  box-shadow: 0 0 35px -5px rgba(255, 122, 24, 0.25);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-4px);
  box-shadow: 0 0 45px -5px rgba(255, 122, 24, 0.4);
}

.pricing-featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: #ff7a18;
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 3px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  box-shadow: 0 4px 12px rgba(255, 122, 24, 0.5);
}

.pricing-title {
  text-align: center;
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 22px;
}

.pricing-price-wrap {
  text-align: center;
  margin-bottom: 28px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.pricing-currency {
  font-size: 1.6rem;
  font-weight: 700;
  color: #10b981; /* 图2绿色标价 */
}

.pricing-num {
  font-size: 2.85rem;
  font-weight: 800;
  color: #10b981; /* 图2绿色标价 */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  letter-spacing: -0.03em;
}

.pricing-period {
  font-size: 0.96rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.94rem;
  color: #d1d5db;
}

.pricing-check {
  color: #10b981;
  font-weight: bold;
  font-size: 1.1rem;
}

.pricing-btn-soft {
  width: 100%;
  padding: 13px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.15);
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: all var(--transition-fast);
}

.pricing-btn-soft:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.pricing-btn-featured {
  width: 100%;
  padding: 13px;
  border-radius: var(--radius-md);
  background: #ff7a18;
  color: #ffffff;
  font-size: 0.98rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  box-shadow: 0 4px 20px rgba(255, 122, 24, 0.45);
  transition: all var(--transition-fast);
}

.pricing-btn-featured:hover {
  background: #ea580c;
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(255, 122, 24, 0.65);
}

/* ===================================================================
   Articles Knowledge Base Section (12 Articles Grid + 10th Card Special Dynamic Treatment)
   =================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  overflow: hidden;
}

.article-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  box-shadow: var(--shadow-glass);
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.article-badge {
  font-size: 0.76rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.article-readtime {
  font-size: 0.8rem;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  gap: 4px;
}

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

.article-title a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-keywords-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
}

.kw-chip {
  font-size: 0.74rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.article-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-faint);
}

.article-read-btn {
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.88rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition-fast);
}

.article-read-btn:hover {
  gap: 8px;
  color: #ffffff;
}

/* ===================================================================
   第十位卡片定制（资深架构深度重构解析 - 动态视觉点缀）
   =================================================================== */
.article-card--tenth {
  border: 1px solid rgba(245, 158, 11, 0.45);
  background: linear-gradient(145deg, rgba(23, 27, 44, 0.85) 0%, rgba(35, 26, 18, 0.7) 100%);
  box-shadow: 0 16px 40px -10px rgba(245, 158, 11, 0.18), 0 0 1px 1px rgba(245, 158, 11, 0.35);
  position: relative;
}

.article-card--tenth::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 200%;
  height: 2px;
  background: linear-gradient(90deg, transparent, #f59e0b, #ff7a18, transparent);
  animation: shimmerLine 4s infinite linear;
}

@keyframes shimmerLine {
  0% { transform: translateX(0); }
  100% { transform: translateX(50%); }
}

.article-card--tenth:hover {
  transform: translateY(-6px);
  border-color: rgba(245, 158, 11, 0.7);
  box-shadow: 0 20px 48px -10px rgba(245, 158, 11, 0.32);
}

.tenth-special-badge {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.25) 0%, rgba(255, 122, 24, 0.25) 100%);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.5);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sparkle-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #fbbf24;
  box-shadow: 0 0 8px #fbbf24;
  animation: pulseDot 1.6s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.4); opacity: 1; }
}

/* ===================================================================
   50 FAQ Section
   =================================================================== */
.faq-filter-wrap {
  margin-bottom: 36px;
}

.faq-search-box {
  width: 100%;
  max-width: 680px;
  margin: 0 auto 24px auto;
  position: relative;
}

.faq-input {
  width: 100%;
  padding: 15px 22px 15px 48px;
  font-size: 0.98rem;
  border-radius: var(--radius-md);
  background: var(--bg-glass-input);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  color: #ffffff;
  outline: none;
  transition: all var(--transition-fast);
}

.faq-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

.faq-search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-faint);
  pointer-events: none;
}

.faq-chips-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.faq-chip {
  padding: 7px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.faq-chip:hover,
.faq-chip.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: rgba(56, 189, 248, 0.4);
  color: #ffffff;
}

.faq-results-counter {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-faint);
  margin-top: 12px;
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 980px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-light);
}

.faq-item[open] {
  border-color: rgba(56, 189, 248, 0.3);
  background: rgba(20, 29, 48, 0.85);
}

.faq-summary {
  list-style: none;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 1.02rem;
  font-weight: 600;
  color: #ffffff;
  user-select: none;
}

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

.faq-q-text {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-right: 16px;
}

.faq-q-index {
  font-size: 0.8rem;
  font-family: ui-monospace, SFMono-Regular, monospace;
  color: var(--accent-cyan);
  padding: 2px 7px;
  background: rgba(56, 189, 248, 0.12);
  border-radius: 4px;
}

.faq-chevron {
  transition: transform var(--transition-fast);
  color: var(--text-faint);
  flex-shrink: 0;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-cyan);
}

.faq-body {
  padding: 0 22px 20px 22px;
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 4px;
  padding-top: 14px;
}

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

/* ===================================================================
   Article Detail Page Layout & Typography
   =================================================================== */
.article-page-header {
  padding: 60px 0 36px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.article-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-faint);
  margin-bottom: 20px;
}

.article-breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
}

.article-breadcrumbs a:hover {
  color: #ffffff;
}

.article-headline {
  font-size: clamp(2rem, 3.4vw, 2.9rem);
  font-weight: 800;
  line-height: 1.25;
  color: #ffffff;
  margin-bottom: 22px;
  letter-spacing: -0.02em;
}

.article-stats-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  padding: 14px 20px;
  background: rgba(16, 23, 38, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  color: var(--text-muted);
}

.article-stat-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-stat-item strong {
  color: #ffffff;
}

.article-body-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  padding: 48px 0 80px 0;
}

.article-content {
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-content h2 {
  font-size: 1.7rem;
  font-weight: 700;
  color: #ffffff;
  margin: 44px 0 20px 0;
  line-height: 1.35;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 10px;
}

.article-content h3 {
  font-size: 1.32rem;
  font-weight: 600;
  color: #f1f5f9;
  margin: 32px 0 16px 0;
}

.article-content p {
  margin-bottom: 22px;
}

.article-content ul,
.article-content ol {
  margin: 0 0 24px 24px;
}

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

.article-content strong {
  color: #ffffff;
  font-weight: 600;
}

.article-content blockquote {
  border-left: 4px solid var(--accent-cyan);
  background: rgba(56, 189, 248, 0.08);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 28px 0;
  color: #e2e8f0;
  font-style: normal;
}

.article-content pre {
  background: #090d16;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 20px;
  overflow-x: auto;
  margin: 28px 0;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  color: #38bdf8;
}

.article-content code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  color: #fbbf24;
}

.article-content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Comparison Tables */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  font-size: 0.94rem;
}

.article-content th {
  background: rgba(255, 255, 255, 0.06);
  padding: 14px 18px;
  text-align: left;
  color: #ffffff;
  font-weight: 600;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content td {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
}

.article-content tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* In-Article FAQ Section */
.article-faq-section {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 2px dashed var(--border-subtle);
}

.article-faq-title {
  font-size: 1.55rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 24px;
}

/* Article Sidebar */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.sidebar-box {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.sidebar-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.sidebar-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  line-height: 1.45;
  transition: color var(--transition-fast);
}

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

/* ===================================================================
   Footer Section
   =================================================================== */
.site-footer {
  background: #05070a;
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 36px 0;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-faint);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-top: 14px;
  max-width: 380px;
}

.footer-col h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.84rem;
  color: var(--text-faint);
  flex-wrap: wrap;
  gap: 16px;
}

/* ===================================================================
   Responsive Design
   =================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  .article-body-layout {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #0a0e18;
    border-bottom: 1px solid var(--border-subtle);
    padding: 20px 24px;
    gap: 14px;
    box-shadow: 0 16px 30px rgba(0, 0, 0, 0.8);
  }
  .mobile-menu-toggle {
    display: block;
  }
  .hero-metrics {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}