/* ==========================================================================
   SSRDOG - 烈焰金橙竞技风 (Flame Gold-Orange Competitive Design System)
   Theme: 黑耀深渊 (#09090b) + 荧光烈焰金橙渐变 (#f97316 -> #fbbf24)
   Standards: 原生 CSS3 响应式、秒开架构、金属微光与毛玻璃磨砂交互
   ========================================================================== */

:root {
  /* 基础暗黑配色 */
  --bg-abyss: #09090b;
  --bg-surface-1: #101015;
  --bg-surface-2: #16161f;
  --bg-surface-3: #1f1f2b;
  --bg-card-glass: rgba(18, 18, 24, 0.72);
  --bg-card-glass-hover: rgba(28, 28, 38, 0.85);

  /* 烈焰金橙主色调与渐变 */
  --flame-orange: #f97316;
  --flame-amber: #fbbf24;
  --flame-red: #ea580c;
  --flame-gradient: linear-gradient(135deg, #f97316 0%, #fbbf24 100%);
  --flame-gradient-hover: linear-gradient(135deg, #ea580c 0%, #f59e0b 100%);
  --flame-gradient-radial: radial-gradient(circle at 50% 0%, rgba(249, 115, 22, 0.22) 0%, rgba(9, 9, 11, 0) 70%);
  --metallic-gradient: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(249, 115, 22, 0.1) 50%, rgba(251, 191, 36, 0.2) 100%);

  /* 边框与微光 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glass: rgba(249, 115, 22, 0.22);
  --border-glass-hover: rgba(251, 191, 36, 0.55);
  --glow-flame-sm: 0 0 15px rgba(249, 115, 22, 0.35);
  --glow-flame-md: 0 0 25px rgba(249, 115, 22, 0.45), 0 0 10px rgba(251, 191, 36, 0.25);
  --glow-flame-lg: 0 0 40px rgba(249, 115, 22, 0.6), 0 0 20px rgba(251, 191, 36, 0.35);

  /* 文字排版 */
  --text-primary: #f4f4f5;
  --text-secondary: #d4d4d8;
  --text-muted: #a1a1aa;
  --text-faint: #71717a;

  /* 状态与辅助色 */
  --color-success: #10b981;
  --color-success-glow: rgba(16, 185, 129, 0.25);
  --color-cyan: #06b6d4;

  /* 尺寸与间距 */
  --max-width: 1240px;
  --header-height: 72px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* 动效过渡 */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  color-scheme: dark;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  background-color: var(--bg-abyss);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 50% -20%, rgba(249, 115, 22, 0.15), transparent 45%),
    radial-gradient(circle at 85% 30%, rgba(251, 191, 36, 0.05), transparent 35%),
    radial-gradient(circle at 15% 70%, rgba(234, 88, 12, 0.06), transparent 40%);
  background-attachment: fixed;
}

/* 链接基础样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: transparent;
}

ul, ol {
  list-style: none;
}

/* ==========================================================================
   Layout & Container
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding: 96px 0;
  position: relative;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

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

/* 标题徽章与文本排版 */
.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(249, 115, 22, 0.1);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  color: var(--flame-amber);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
  box-shadow: inset 0 0 12px rgba(249, 115, 22, 0.12);
}

.section-badge .badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--flame-orange);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--flame-orange);
  animation: pulseDot 2s infinite;
}

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

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
  color: #ffffff;
}

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

/* 文本渐变工具类 */
.gradient-text {
  background: var(--flame-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.gradient-text-gold {
  background: linear-gradient(135deg, #ffffff 30%, #fbbf24 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ==========================================================================
   Buttons & CTA System (带金属光泽与高能发光)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  text-align: center;
}

/* 主推烈焰高能按钮 (Primary CTA) */
.btn-flame {
  background: var(--flame-gradient);
  color: #09090b !important;
  box-shadow: var(--glow-flame-md);
  border: 1px solid rgba(255, 255, 255, 0.35);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.btn-flame::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transform: skewX(-25deg);
  transition: left 0.75s ease;
}

.btn-flame:hover {
  background: var(--flame-gradient-hover);
  box-shadow: var(--glow-flame-lg);
  transform: translateY(-2px);
  color: #000000 !important;
}

.btn-flame:hover::before {
  left: 140%;
}

.btn-flame:active {
  transform: translateY(0);
}

/* 次级磨砂金属边框按钮 (Secondary CTA) */
.btn-glass {
  background: rgba(24, 24, 32, 0.65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
}

.btn-glass:hover {
  background: rgba(36, 36, 48, 0.85);
  border-color: var(--flame-amber);
  color: #ffffff;
  box-shadow: var(--glow-flame-sm);
  transform: translateY(-2px);
}

/* 按钮微型与大号尺寸 */
.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.08rem;
  border-radius: var(--radius-md);
}

.btn-full {
  width: 100%;
}

/* ==========================================================================
   Header & Floating Navigation
   ========================================================================== */
.top-notice-bar {
  background: linear-gradient(90deg, rgba(234, 88, 12, 0.15) 0%, rgba(249, 115, 22, 0.25) 50%, rgba(251, 191, 36, 0.15) 100%);
  border-bottom: 1px solid rgba(249, 115, 22, 0.2);
  padding: 8px 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
}

.top-notice-bar a {
  color: var(--flame-amber);
  font-weight: 700;
  margin-left: 6px;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.top-notice-bar a:hover {
  color: #ffffff;
}

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(9, 9, 11, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* 品牌 Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: var(--flame-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #09090b;
  box-shadow: 0 0 16px rgba(249, 115, 22, 0.5);
  position: relative;
}

.brand-logo span.text-brand {
  font-family: inherit;
  background: linear-gradient(135deg, #ffffff 40%, var(--flame-amber) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-badge {
  font-size: 0.65rem;
  padding: 2px 7px;
  background: rgba(249, 115, 22, 0.15);
  border: 1px solid var(--border-glass);
  color: var(--flame-amber);
  border-radius: 4px;
  font-weight: 700;
  vertical-align: middle;
}

/* 导航链接 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--flame-gradient);
  transition: width var(--transition-normal);
  border-radius: 2px;
}

.nav-link:hover {
  color: #ffffff;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 移动端汉堡菜单触发器 */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 32px;
  height: 32px;
  padding: 4px;
  z-index: 1010;
}

.mobile-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

.mobile-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 80px 0 96px 0;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  background: rgba(24, 24, 32, 0.7);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.hero-badge-icon {
  color: var(--flame-amber);
}

.hero-badge-text {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.hero-badge-highlight {
  color: var(--flame-amber);
  font-weight: 700;
}

.hero-title {
  font-size: clamp(2.4rem, 4.5vw, 3.6rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: #ffffff;
  margin-bottom: 24px;
}

.hero-description {
  font-size: 1.15rem;
  line-height: 1.75;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 600px;
}

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

.hero-trust-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.trust-item svg {
  color: var(--flame-amber);
  flex-shrink: 0;
}

/* Hero 右侧实时遥测面板卡片 (Telemetry Card) */
.hero-card-wrapper {
  position: relative;
}

.hero-card-wrapper::before {
  content: "";
  position: absolute;
  inset: -10px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.25) 0%, transparent 70%);
  filter: blur(25px);
  z-index: 1;
  border-radius: var(--radius-lg);
}

.telemetry-card {
  position: relative;
  z-index: 2;
  background: var(--bg-card-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

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

.telemetry-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
}

.pulse-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 10px var(--color-success);
  animation: pulseDot 1.5s infinite;
}

.telemetry-tag {
  font-size: 0.75rem;
  padding: 4px 10px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* 节点压测实时行数据 */
.node-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: rgba(24, 24, 32, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.node-row:hover {
  background: rgba(36, 36, 48, 0.85);
  border-color: rgba(249, 115, 22, 0.3);
  transform: translateX(4px);
}

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

.node-flag {
  font-size: 1.25rem;
}

.node-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: #ffffff;
  display: block;
}

.node-type {
  font-size: 0.75rem;
  color: var(--text-faint);
  display: block;
}

.node-stats {
  text-align: right;
}

.node-ping {
  font-size: 0.85rem;
  font-weight: 700;
  color: #34d399;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
}

.node-loss {
  font-size: 0.75rem;
  color: var(--flame-amber);
}

.telemetry-footer-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  text-align: center;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.stat-box {
  padding: 8px;
}

.stat-number {
  font-size: 1.25rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 2px;
}

.stat-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Core Advantages (3 大核心优势卡片)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--flame-gradient);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glass-hover);
  background: var(--bg-card-glass-hover);
  box-shadow: var(--glow-flame-md);
}

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

.feature-icon-box {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(249, 115, 22, 0.12);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--flame-amber);
  margin-bottom: 24px;
  transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon-box {
  background: var(--flame-gradient);
  color: #09090b;
  box-shadow: 0 0 20px rgba(249, 115, 22, 0.5);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 14px;
  line-height: 1.3;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.feature-pill {
  font-size: 0.75rem;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  color: var(--text-muted);
}

/* ==========================================================================
   Network Matrix & Real-time Nodes Showcase
   ========================================================================== */
.network-matrix {
  background: linear-gradient(180deg, rgba(16, 16, 22, 0.8) 0%, rgba(9, 9, 11, 0.95) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-top: 40px;
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.6);
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.matrix-item {
  background: rgba(24, 24, 32, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all var(--transition-fast);
}

.matrix-item:hover {
  background: rgba(32, 32, 44, 0.7);
  border-color: rgba(249, 115, 22, 0.4);
}

.matrix-loc {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.matrix-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.matrix-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
}

.matrix-speed {
  color: var(--flame-amber);
  font-weight: 700;
}

.matrix-status {
  color: #34d399;
}

/* ==========================================================================
   Pricing Section (精细化价格表)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glass);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
}

/* 热门推荐高亮卡片 (Popular / Pro) */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(30, 24, 20, 0.85) 0%, rgba(18, 18, 24, 0.95) 100%);
  border: 1px solid var(--border-glass-hover);
  box-shadow: var(--glow-flame-md);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: var(--glow-flame-lg);
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--flame-gradient);
  color: #09090b;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 0 15px rgba(249, 115, 22, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

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

.pricing-plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 42px;
}

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

.pricing-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--flame-amber);
}

.pricing-amount {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
  color: #ffffff;
}

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

.pricing-features-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 36px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.pricing-feature-item svg {
  color: var(--flame-amber);
  flex-shrink: 0;
  margin-top: 3px;
}

.pricing-feature-item strong {
  color: #ffffff;
}

/* ==========================================================================
   Curated Articles Section (精选长尾技术专题板块 - 仅 2 篇真实文章)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.article-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glass-hover);
  background: var(--bg-card-glass-hover);
  box-shadow: var(--glow-flame-md);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.article-tag {
  font-size: 0.75rem;
  padding: 4px 12px;
  background: rgba(249, 115, 22, 0.12);
  border: 1px solid var(--border-glass);
  color: var(--flame-amber);
  border-radius: var(--radius-full);
  font-weight: 700;
}

.article-date {
  font-size: 0.82rem;
  color: var(--text-faint);
}

.article-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.4;
  margin-bottom: 14px;
  transition: color var(--transition-fast);
}

.article-card:hover .article-title {
  color: var(--flame-amber);
}

.article-excerpt {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.article-link-action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--flame-amber);
  transition: gap var(--transition-fast);
}

.article-card:hover .article-link-action {
  gap: 12px;
  color: #ffffff;
}

/* ==========================================================================
   User Testimonials (用户五星好评板块)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(249, 115, 22, 0.3);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.review-stars {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--flame-amber);
  margin-bottom: 16px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.25), rgba(251, 191, 36, 0.25));
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--flame-amber);
}

.author-info {
  display: flex;
  flex-direction: column;
}

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

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

/* ==========================================================================
   FAQ Section (常见问题手风琴)
   ========================================================================== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card-glass);
  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-normal);
}

.faq-item:hover, .faq-item.active {
  border-color: var(--border-glass);
}

.faq-question {
  width: 100%;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  cursor: pointer;
}

.faq-icon {
  width: 22px;
  height: 22px;
  color: var(--flame-amber);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-smooth), padding var(--transition-smooth);
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 22px 24px;
}

/* ==========================================================================
   Bottom Conversion Banner (底部高能转化横幅)
   ========================================================================== */
.bottom-cta-banner {
  background: radial-gradient(circle at 50% 50%, rgba(249, 115, 22, 0.18) 0%, rgba(9, 9, 11, 0.95) 100%),
              linear-gradient(180deg, #121218 0%, #09090b 100%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 64px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--glow-flame-md);
}

.bottom-cta-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--flame-gradient);
}

.cta-title {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 900;
  color: #ffffff;
  line-height: 1.25;
  margin-bottom: 18px;
}

.cta-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 36px auto;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: #060608;
  border-top: 1px solid var(--border-subtle);
  padding: 72px 0 36px 0;
  position: relative;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 56px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 320px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.footer-links a:hover {
  color: var(--flame-amber);
  transform: translateX(3px);
}

.footer-bottom {
  padding-top: 32px;
  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-faint);
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

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

.footer-bottom-links a:hover {
  color: var(--text-secondary);
}

/* ==========================================================================
   Responsive Media Queries (移动端极致适配)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
  }

  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .hero-trust-list {
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: 1fr;
    max-width: 580px;
    margin-left: auto;
    margin-right: auto;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }

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

  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }

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

  .articles-grid {
    grid-template-columns: 1fr;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .section {
    padding: 64px 0;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: rgba(9, 9, 11, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 32px 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border-glass);
    display: none;
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-toggle {
    display: flex;
  }

  .header-actions .btn-sm:not(.btn-flame) {
    display: none;
  }

  .matrix-grid {
    grid-template-columns: 1fr;
  }

  .bottom-cta-banner {
    padding: 40px 20px;
  }

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

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