/* ==========================================================================
   咕嘎云 (GugaCloud - gugayun.mom) - 原生 Native CSS 极致性能设计系统
   纯原生 HTML5 + CSS3，无重型框架，秒开级加载，全平台完美响应式适配
   ========================================================================== */

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

  /* Theme Colors */
  --bg-main: #060913;
  --bg-card: rgba(13, 20, 38, 0.75);
  --bg-card-hover: rgba(20, 31, 58, 0.88);
  --bg-glass: rgba(8, 14, 28, 0.85);
  --bg-accent: rgba(56, 189, 248, 0.08);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(56, 189, 248, 0.25);
  --border-glow: rgba(56, 189, 248, 0.55);

  --cyan-primary: #38bdf8;
  --cyan-light: #7dd3fc;
  --blue-vivid: #2563eb;
  --purple-glow: #8b5cf6;
  --purple-light: #c084fc;
  --emerald-success: #10b981;
  --amber-warning: #f59e0b;
  --rose-accent: #f43f5e;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  --shadow-card: 0 16px 40px -12px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 30px rgba(56, 189, 248, 0.22);
  --shadow-btn: 0 10px 25px -5px rgba(56, 189, 248, 0.45);

  --container-max: 1260px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.65;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

img, svg {
  vertical-align: middle;
}

ul, ol {
  list-style: none;
}

/* ==========================================================================
   纯 CSS 动态星空与高能流光背景 (Pure CSS Dynamic Ambient Background)
   0 外部 JS 依赖，GPU 硬件加速，极速无感加载
   ========================================================================== */
.dynamic-background {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
  background: radial-gradient(circle at 50% 8%, #0d1b38 0%, #060a16 50%, #03060c 100%);
}

/* Cyber Grid */
.cyber-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(56, 189, 248, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(56, 189, 248, 0.035) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(circle at 50% 30%, black 40%, transparent 85%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, black 40%, transparent 85%);
}

/* Floating Ambient Glowing Orbs */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(85px);
  opacity: 0.45;
  will-change: transform;
}

.orb-1 {
  width: 550px;
  height: 550px;
  top: -120px;
  left: 10%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.4) 0%, rgba(37, 99, 235, 0.15) 70%, transparent 100%);
  animation: orbFloat1 22s ease-in-out infinite alternate;
}

.orb-2 {
  width: 600px;
  height: 600px;
  top: 30%;
  right: -80px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.35) 0%, rgba(59, 130, 246, 0.12) 70%, transparent 100%);
  animation: orbFloat2 26s ease-in-out infinite alternate;
}

.orb-3 {
  width: 500px;
  height: 500px;
  bottom: 5%;
  left: 20%;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.32) 0%, rgba(14, 165, 233, 0.1) 70%, transparent 100%);
  animation: orbFloat3 20s ease-in-out infinite alternate;
}

@keyframes orbFloat1 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, 35px) scale(1.08); }
  100% { transform: translate(-30px, 70px) scale(0.94); }
}

@keyframes orbFloat2 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-60px, -40px) scale(1.06); }
  100% { transform: translate(-25px, 50px) scale(0.92); }
}

@keyframes orbFloat3 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(45px, -50px) scale(1.1); }
  100% { transform: translate(-40px, -20px) scale(0.98); }
}

/* Diagonal Hypersonic Speed Streaks */
.speed-streak {
  position: absolute;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, rgba(56, 189, 248, 0.8) 50%, rgba(192, 132, 252, 0.9) 80%, #fff 100%);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.8);
  transform: rotate(-32deg);
  will-change: transform, opacity;
  opacity: 0;
}

.streak-1 {
  width: 260px;
  top: 14%;
  left: -200px;
  animation: streakMove 11s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.streak-2 {
  width: 340px;
  top: 40%;
  left: -260px;
  animation: streakMove 14s cubic-bezier(0.2, 0.8, 0.2, 1) 4s infinite;
}

.streak-3 {
  width: 300px;
  top: 72%;
  left: -220px;
  animation: streakMove 12s cubic-bezier(0.2, 0.8, 0.2, 1) 8s infinite;
}

@keyframes streakMove {
  0% {
    transform: translate(0, 0) rotate(-32deg);
    opacity: 0;
  }
  15% {
    opacity: 0.85;
  }
  50% {
    opacity: 0.65;
  }
  85% {
    opacity: 0.2;
  }
  100% {
    transform: translate(180vw, 110vh) rotate(-32deg);
    opacity: 0;
  }
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.brand-logo {
  height: 52px;
  width: auto;
  transition: transform var(--transition-fast);
}

.brand-link:hover .brand-logo {
  transform: translateY(-1px) scale(1.02);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
  background-color: rgba(255, 255, 255, 0.05);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* CTA Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 50%, #7c3aed 100%);
  color: #ffffff;
  box-shadow: var(--shadow-btn);
  border-color: rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -4px rgba(56, 189, 248, 0.65);
  background: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 50%, #8b5cf6 100%);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border-color: var(--border-medium);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--cyan-primary);
  color: var(--cyan-light);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 0.9rem 2.2rem;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  position: relative;
  z-index: 1;
  padding: 5rem 1.5rem 4rem;
  text-align: center;
}

.hero-inner {
  max-width: 1240px;
  margin: 0 auto;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: var(--cyan-light);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.3rem;
}

.badge-pulse {
  width: 8px;
  height: 8px;
  background-color: var(--emerald-success);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--emerald-success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.15); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}


.hero-brand-title {
  font-size: clamp(2.2rem, 4.5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.02em;
  margin-bottom: 0.85rem;
  background: linear-gradient(135deg, #ffffff 15%, #bae6fd 45%, #38bdf8 75%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 25px rgba(56, 189, 248, 0.35));
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.hero-brand-title .brand-en {
  font-family: var(--font-sans);
  letter-spacing: 0.04em;
}

.hero-title {
  font-size: clamp(1.35rem, 2.25vw, 2.45rem);
  font-weight: 900;
  line-height: 1.35;
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: nowrap;
  gap: 0.6rem;
  white-space: nowrap;
}

.hero-title .title-sep {
  color: var(--cyan-primary);
  opacity: 0.8;
  font-weight: 700;
  margin: 0 0.15rem;
}

.hero-title .title-chunk {
  display: inline-block;
  white-space: nowrap;
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 15%, #7dd3fc 60%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 2.4rem;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 940px;
  margin: 3.5rem auto 0;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border-subtle);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 2.2rem;
  font-weight: 900;
  color: #ffffff;
  font-family: var(--font-mono);
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

/* ==========================================================================
   Section Common
   ========================================================================== */
section {
  position: relative;
  z-index: 1;
  padding: 5rem 1.5rem;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--cyan-primary);
  margin-bottom: 0.6rem;
}

.section-title {
  font-size: clamp(1.9rem, 3.5vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

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

/* ==========================================================================
   Pricing Section - 所有价格同排 (Strict Horizontal Row)
   ========================================================================== */
.pricing-section {
  background: linear-gradient(180deg, rgba(8, 14, 28, 0) 0%, rgba(13, 24, 48, 0.45) 50%, rgba(8, 14, 28, 0) 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr); /* 严格同排 4 列 */
  gap: 1.4rem;
  align-items: stretch;
}

.pricing-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.2rem 1.5rem 1.8rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-card);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  box-shadow: 0 20px 48px -12px rgba(56, 189, 248, 0.35);
  background: var(--bg-card-hover);
}

.pricing-card.featured {
  border-color: rgba(56, 189, 248, 0.6);
  background: linear-gradient(180deg, rgba(14, 28, 58, 0.88) 0%, rgba(11, 20, 42, 0.95) 100%);
  box-shadow: 0 16px 42px -10px rgba(56, 189, 248, 0.35);
}

.pricing-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #0284c7, #8b5cf6);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.5);
}

.card-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
  color: #ffffff;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 2.5em;
}

.plan-price-wrap {
  text-align: center;
  margin: 1.2rem 0;
  padding: 1.2rem 0;
  border-top: 1px dashed var(--border-subtle);
  border-bottom: 1px dashed var(--border-subtle);
}

.price-currency {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--cyan-primary);
  vertical-align: top;
  margin-right: 2px;
}

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

.price-period {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.price-subhint {
  display: block;
  font-size: 0.78rem;
  color: var(--emerald-success);
  margin-top: 0.4rem;
  font-weight: 600;
}

.plan-features {
  margin: 1.2rem 0 2rem;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
  line-height: 1.45;
}

.plan-features li svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--cyan-primary);
}

.plan-features li strong {
  color: #ffffff;
}

.pricing-card .btn {
  width: 100%;
}

/* ==========================================================================
   Features & Core Advantages
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
}

.feature-box:hover {
  transform: translateY(-5px);
  border-color: var(--border-medium);
  background: var(--bg-card-hover);
}

.feature-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.4rem;
  color: var(--cyan-primary);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.feature-box h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.7rem;
  color: #ffffff;
}

.feature-box p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ==========================================================================
   Supported Clients / Ecosystem
   ========================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.2rem;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem 1rem;
  text-align: center;
  transition: all var(--transition-fast);
}

.client-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-3px);
  background: var(--bg-card-hover);
}

.client-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  color: var(--cyan-light);
}

.client-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.2rem;
}

.client-platform {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ==========================================================================
   Articles & Knowledge Base Hub (文章矩阵)
   ========================================================================== */
.articles-section {
  background: linear-gradient(180deg, rgba(8, 14, 28, 0) 0%, rgba(13, 20, 38, 0.5) 50%, rgba(8, 14, 28, 0) 100%);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 16px 36px -10px rgba(56, 189, 248, 0.25);
  background: var(--bg-card-hover);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.article-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.15);
  color: var(--cyan-light);
}

.article-date {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 0.8rem;
  color: #ffffff;
}

.article-card:hover .article-title {
  color: var(--cyan-light);
}

.article-excerpt {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.65;
  margin-bottom: 1.4rem;
  flex-grow: 1;
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--cyan-primary);
}

.article-card:hover .article-link {
  color: #ffffff;
}

/* ==========================================================================
   User Reviews / Testimonials (用户真实评价)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.6rem;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
}

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

.review-stars {
  color: #facc15;
  font-size: 1rem;
  margin-bottom: 0.8rem;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.4rem;
  font-style: italic;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #8b5cf6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
  font-size: 1rem;
}

.author-info h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
}

.author-info p {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ==========================================================================
   FAQ Section (常见问题解答)
   ========================================================================== */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.4rem;
}

.faq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
}

.faq-card:hover {
  border-color: var(--border-medium);
  background: var(--bg-card-hover);
}

.faq-question {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.8rem;
}

.faq-question svg {
  color: var(--cyan-primary);
  flex-shrink: 0;
  margin-top: 3px;
}

.faq-answer {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   External Links / Tool Directory (优质外链与生态工具)
   ========================================================================== */
.external-links-section {
  border-top: 1px solid var(--border-subtle);
  background: rgba(6, 10, 20, 0.6);
  padding: 3.5rem 1.5rem;
}

.ext-links-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}

.ext-link-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

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

.ext-link-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ext-link-desc {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background-color: #03050a;
  padding: 4rem 1.5rem 2rem;
  position: relative;
  z-index: 1;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-top: 1.2rem;
  max-width: 380px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1.2rem;
}

.footer-links li {
  margin-bottom: 0.7rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.88rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-dim);
}

.footer-compliance {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ==========================================================================
   Article Detail Page Typography & Layout
   ========================================================================== */
.article-detail-header {
  padding: 4rem 1.5rem 2.5rem;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
}

.article-breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

.article-breadcrumbs a {
  color: var(--cyan-primary);
}

.article-breadcrumbs a:hover {
  text-decoration: underline;
}

.article-main-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.3;
  max-width: 950px;
  margin: 0 auto 1.4rem;
}

.article-publish-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.4rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.article-body-wrapper {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

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

.article-content h2 {
  font-size: 1.8rem;
  font-weight: 800;
  color: #ffffff;
  margin: 2.8rem 0 1.2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #f1f5f9;
  margin: 2rem 0 0.9rem;
}

.article-content p {
  margin-bottom: 1.4rem;
}

.article-content ul, .article-content ol {
  margin: 1.2rem 0 1.8rem 1.5rem;
}

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  margin-bottom: 0.6rem;
}

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

.article-callout {
  background: rgba(56, 189, 248, 0.08);
  border-left: 4px solid var(--cyan-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.4rem 1.6rem;
  margin: 2rem 0;
}

.article-callout.warning {
  background: rgba(245, 158, 11, 0.08);
  border-left-color: var(--amber-warning);
}

.article-callout.success {
  background: rgba(16, 185, 129, 0.08);
  border-left-color: var(--emerald-success);
}

.article-table-wrap {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
  background: var(--bg-card);
}

.article-table th, .article-table td {
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-table th {
  background: rgba(255, 255, 255, 0.04);
  color: #ffffff;
  font-weight: 700;
}

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

.article-cta-box {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  margin: 3.5rem 0;
  box-shadow: 0 12px 32px rgba(56, 189, 248, 0.18);
}

.article-cta-box h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.8rem;
}

.article-cta-box p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 1.6rem;
}

.related-articles {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-subtle);
}

.related-articles h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 1.8rem;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1100px) {
  .hero-title {
    font-size: clamp(1.2rem, 2.6vw, 1.85rem);
  }

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr); /* 平板下拆分两排两列 */
    gap: 1.4rem;
  }

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

  .clients-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .hero-brand-title {
    font-size: clamp(1.75rem, 6.2vw, 2.35rem);
    margin-bottom: 0.65rem;
    gap: 0.45rem;
  }

  .hero-title {
    font-size: clamp(1.1rem, 4.5vw, 1.45rem);
    white-space: normal;
    flex-direction: column;
    gap: 0.35rem;
    line-height: 1.4;
  }

  .hero-title .title-sep {
    display: none;
  }

  .nav-menu {
    display: none; /* 移动端精简保留核心 CTA */
  }

  .hero {
    padding: 3.5rem 1rem 3rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.2rem;
  }

  .pricing-grid {
    grid-template-columns: 1fr; /* 手机端单列自适应滑动 */
  }

  .features-grid, .articles-grid, .reviews-grid, .faq-grid {
    grid-template-columns: 1fr;
  }

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

  .ext-links-grid {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}