/* ==========================================================================
   魔戒 (MOJIE) 品牌官网与技术博客设计系统
   视觉风格：魔戒VPN高端工业工艺 ＋ 极简企业级专线 ＋ 高端科技产品设计
   色彩体系：月光灰白(#F3F2EE) + 精工银色 + 深曜石黑 + 能量蓝 + 少量古金色
   ========================================================================== */

:root {
  /* 基础色系 */
  --bg-primary: #F3F2EE;
  --bg-secondary: #FAFAF8;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FCFCFA;
  --bg-surface: #EBEAE5;
  --bg-dark: #111418;
  --bg-dark-surface: #181D24;
  --bg-dark-card: #1E232B;

  /* 金属质感色系 (Metallic Silver) */
  --mithril-100: #F8FAFC;
  --mithril-200: #E2E8F0;
  --mithril-300: #CBD5E1;
  --mithril-400: #94A3B8;
  --mithril-500: #64748B;
  --mithril-border: rgba(186, 199, 213, 0.65);
  --mithril-border-light: rgba(255, 255, 255, 0.85);
  --mithril-gradient: linear-gradient(135deg, #FFFFFF 0%, #E6EDF5 50%, #CDD7E2 100%);
  --mithril-sheen: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.7) 50%, transparent 70%);

  /* 能量蓝系 (Energy Blue) */
  --energy-blue: #0066FF;
  --energy-blue-light: #2D7DFF;
  --energy-blue-glow: rgba(0, 102, 255, 0.25);
  --energy-blue-subtle: rgba(0, 102, 255, 0.08);

  /* 薄荷绿 (Mint Green / Connected State) */
  --mint-green: #00E599;
  --mint-green-dark: #10B981;
  --mint-green-glow: rgba(0, 229, 153, 0.35);

  /* 古金色系 (Ancient Gold Accents) */
  --ancient-gold: #C5A869;
  --ancient-gold-light: #E0C788;
  --ancient-gold-dark: #9E7E38;
  --ancient-gold-glow: rgba(197, 168, 105, 0.25);

  /* 深曜石黑系 (Obsidian Black) */
  --obsidian-900: #0C0F12;
  --obsidian-800: #111418;
  --obsidian-700: #1A1F26;
  --obsidian-600: #262D37;
  --obsidian-text: #111418;
  --obsidian-subtext: #505A69;
  --obsidian-muted: #7E8B9B;

  /* 阴影体系 */
  --shadow-sm: 0 2px 8px rgba(17, 20, 24, 0.04);
  --shadow-md: 0 8px 24px rgba(17, 20, 24, 0.06);
  --shadow-lg: 0 16px 40px rgba(17, 20, 24, 0.08);
  --shadow-mithril: 0 10px 30px rgba(186, 199, 213, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.9);
  --shadow-blue-glow: 0 0 25px rgba(0, 102, 255, 0.35);

  /* 字体体系 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Menlo, Monaco, Consolas, monospace;

  /* 容器尺寸 */
  --container-max: 1240px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 26px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--obsidian-text);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
}

/* 背景精密网格刻纹 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(0, 102, 255, 0.04) 0%, transparent 60%),
    linear-gradient(rgba(17, 20, 24, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(17, 20, 24, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  pointer-events: none;
  z-index: -1;
}

/* 链接与排版 */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

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

.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ==========================================================================
   Header & 导航栏
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(243, 242, 238, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(186, 199, 213, 0.4);
  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;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--obsidian-900);
}

.logo-ring-icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 2.5px solid var(--mithril-300);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 12px rgba(0, 102, 255, 0.25);
  background: radial-gradient(circle, rgba(0, 102, 255, 0.1) 0%, transparent 70%);
}

.logo-ring-icon::before {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1.5px dashed var(--energy-blue);
  animation: ringRotate 12s linear infinite;
}

.logo-ring-icon::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--energy-blue);
  box-shadow: 0 0 8px var(--energy-blue);
}

.brand-text-en {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--energy-blue);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-left: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-item {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--obsidian-subtext);
  position: relative;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

.nav-item:hover, .nav-item.active {
  color: var(--obsidian-900);
}

.nav-item::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--energy-blue);
  transition: width var(--transition-fast);
}

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

.nav-badge-pill {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 6px;
  background: rgba(0, 102, 255, 0.1);
  color: var(--energy-blue);
  border-radius: var(--radius-full);
  margin-left: 4px;
  vertical-align: middle;
}

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

.btn-mithril {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  background: var(--mithril-gradient);
  color: var(--obsidian-900);
  border: 1px solid var(--mithril-border);
  box-shadow: var(--shadow-mithril);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.btn-mithril:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(186, 199, 213, 0.45);
  border-color: var(--energy-blue-light);
}

.btn-primary-ring {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.92rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0052CC 0%, #0066FF 100%);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 16px var(--energy-blue-glow);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.btn-primary-ring:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 102, 255, 0.45);
  background: linear-gradient(135deg, #0066FF 0%, #2D7DFF 100%);
}

.btn-primary-ring::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transform: skewX(-20deg);
  transition: left 0.6s ease;
}

.btn-primary-ring:hover::after {
  left: 150%;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--obsidian-900);
  transition: transform var(--transition-fast);
}

/* ==========================================================================
   Hero 首屏视觉与魔戒VPN专线互动
   ========================================================================== */
.hero-section {
  padding: 60px 0 90px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  align-items: center;
  gap: 48px;
}

.hero-tag-wrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--mithril-border);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.hero-tag-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--mint-green-dark);
  box-shadow: 0 0 8px var(--mint-green);
  animation: pulseDot 2s infinite;
}

.hero-tag-text {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--obsidian-subtext);
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: 3.4rem;
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--obsidian-900);
  margin-bottom: 24px;
}

.hero-title-accent {
  background: linear-gradient(135deg, #0052CC 0%, #0066FF 60%, #C5A869 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.12rem;
  line-height: 1.75;
  color: var(--obsidian-subtext);
  margin-bottom: 36px;
  max-width: 580px;
}

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

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

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

.metric-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--obsidian-900);
  letter-spacing: -0.02em;
}

.metric-number span {
  font-size: 1rem;
  font-weight: 600;
  color: var(--energy-blue);
  margin-left: 2px;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--obsidian-muted);
  font-weight: 500;
  margin-top: 2px;
}

/* 魔戒VPN专线互动视窗 (Mojie VPN Visual & Speed Test Stage) */
.sacred-ring-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 30px;
  border-radius: var(--radius-xl);
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.95) 0%, rgba(243, 242, 238, 0.75) 100%);
  border: 1px solid var(--mithril-border);
  box-shadow: 0 20px 50px rgba(186, 199, 213, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.sacred-ring-visual-wrap {
  width: 100%;
  max-width: 440px;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(17, 20, 24, 0.08);
  border: 1px solid var(--mithril-border);
}

.sacred-ring-visual-wrap img {
  width: 100%;
  height: auto;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.sacred-ring-stage:hover .sacred-ring-visual-wrap img {
  transform: scale(1.02);
}

/* 浮动测速与状态控制器 */
.ring-control-console {
  width: 100%;
  max-width: 440px;
  margin-top: 20px;
  padding: 16px 20px;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--mithril-border);
  box-shadow: var(--shadow-sm);
}

.console-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.console-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--obsidian-900);
}

.ring-pulse-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--energy-blue);
  box-shadow: 0 0 8px var(--energy-blue);
}

.ring-pulse-status.connected {
  background: var(--mint-green);
  box-shadow: 0 0 10px var(--mint-green);
}

.console-protocol-badge {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--bg-surface);
  color: var(--obsidian-subtext);
}

/* 节点快速延迟列表 */
.console-nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 14px;
}

.console-node-item {
  background: var(--bg-secondary);
  border: 1px solid rgba(186, 199, 213, 0.4);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
  text-align: center;
  transition: all var(--transition-fast);
}

.console-node-item:hover, .console-node-item.active {
  border-color: var(--energy-blue);
  background: rgba(0, 102, 255, 0.04);
}

.node-name {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--obsidian-900);
  display: block;
}

.node-ping {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--mint-green-dark);
}

.console-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.btn-speedtest-ring {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background: var(--bg-dark);
  color: #FFFFFF;
  transition: all var(--transition-fast);
}

.btn-speedtest-ring:hover {
  background: var(--obsidian-700);
  box-shadow: 0 4px 12px rgba(17, 20, 24, 0.2);
}

.btn-speedtest-ring.testing {
  background: var(--energy-blue);
  box-shadow: 0 0 14px var(--energy-blue-glow);
}

.ring-energy-bar {
  height: 4px;
  background: #E2E8F0;
  border-radius: 2px;
  overflow: hidden;
  margin-top: 10px;
}

.ring-energy-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--energy-blue), var(--mint-green));
  transition: width 0.4s ease;
}

/* ==========================================================================
   Section 通用布局
   ========================================================================== */
.section {
  padding: 90px 0;
  position: relative;
}

.section-dark {
  background: var(--bg-dark);
  color: #F8FAFC;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--energy-blue);
  margin-bottom: 12px;
}

.section-dark .section-tag {
  color: var(--mint-green);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--obsidian-900);
}

.section-dark .section-title {
  color: #FFFFFF;
}

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

.section-dark .section-desc {
  color: #94A3B8;
}

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

.feature-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1px solid var(--mithril-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--energy-blue), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 102, 255, 0.3);
}

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

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--mithril-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--energy-blue);
  margin-bottom: 22px;
  transition: all var(--transition-fast);
}

.feature-card:hover .feature-icon-box {
  background: var(--energy-blue);
  color: #FFFFFF;
  box-shadow: 0 8px 20px var(--energy-blue-glow);
  border-color: var(--energy-blue);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--obsidian-900);
}

.feature-card-desc {
  font-size: 0.92rem;
  color: var(--obsidian-subtext);
  line-height: 1.68;
}

/* ==========================================================================
   套餐价格 (魔戒VPN金属铭牌造型卡片)
   ========================================================================== */
.pricing-switcher-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 48px;
}

.pricing-switcher {
  display: inline-flex;
  padding: 5px;
  border-radius: var(--radius-full);
  background: #EBEAE5;
  border: 1px solid var(--mithril-border);
}

.pricing-switch-btn {
  padding: 8px 20px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--obsidian-subtext);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.pricing-switch-btn.active {
  background: #FFFFFF;
  color: var(--obsidian-900);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.pricing-discount-tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  background: linear-gradient(135deg, #FF6B00, #FF3D00);
  color: #FFFFFF;
  border-radius: var(--radius-full);
  margin-left: 6px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

/* 魔戒VPN铭牌卡片 */
.pricing-plaque {
  background: linear-gradient(180deg, #FFFFFF 0%, #F9FAF8 100%);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--mithril-border);
  box-shadow: 0 8px 24px rgba(186, 199, 213, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.9);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-plaque:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 48px rgba(186, 199, 213, 0.5), inset 0 1px 0 rgba(255, 255, 255, 1);
  border-color: rgba(0, 102, 255, 0.4);
}

/* 旗舰推荐高亮版 */
.pricing-plaque.flagship {
  border-color: var(--energy-blue);
  background: linear-gradient(180deg, #FFFFFF 0%, #F0F6FF 100%);
  box-shadow: 0 16px 40px rgba(0, 102, 255, 0.15), inset 0 1px 0 rgba(255, 255, 255, 1);
}

.plaque-corner-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #0052CC, #0066FF);
  color: #FFFFFF;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px var(--energy-blue-glow);
}

.plaque-header {
  margin-bottom: 20px;
}

.plaque-tier-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--obsidian-900);
  margin-bottom: 6px;
}

.plaque-tier-desc {
  font-size: 0.82rem;
  color: var(--obsidian-muted);
  line-height: 1.5;
}

.plaque-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--mithril-border);
}

.plaque-currency {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--obsidian-900);
}

.plaque-amount {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--obsidian-900);
  letter-spacing: -0.03em;
}

.plaque-cycle {
  font-size: 0.82rem;
  color: var(--obsidian-muted);
}

.plaque-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.plaque-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--obsidian-subtext);
}

.plaque-feature-item svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--energy-blue);
  margin-top: 3px;
}

.plaque-feature-item strong {
  color: var(--obsidian-900);
}

/* ==========================================================================
   节点矩阵与全球专线 (Global Ring Nodes & Latency)
   ========================================================================== */
.nodes-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.node-filter-btn {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  background: #FFFFFF;
  border: 1px solid var(--mithril-border);
  color: var(--obsidian-subtext);
  transition: all var(--transition-fast);
}

.node-filter-btn.active, .node-filter-btn:hover {
  background: var(--obsidian-900);
  color: #FFFFFF;
  border-color: var(--obsidian-900);
}

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

.node-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--mithril-border);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.node-card:hover {
  transform: translateY(-3px);
  border-color: var(--energy-blue);
  box-shadow: var(--shadow-md);
}

.node-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

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

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

.node-title-text {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--obsidian-900);
}

.node-type-tag {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(0, 102, 255, 0.08);
  color: var(--energy-blue);
  font-weight: 700;
}

.node-specs-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--obsidian-muted);
  padding-top: 10px;
  border-top: 1px solid rgba(186, 199, 213, 0.35);
}

.node-spec-val {
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--mint-green-dark);
}

/* ==========================================================================
   适合人群 (Target Personas)
   ========================================================================== */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.audience-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--mithril-border);
  padding: 24px 20px;
  text-align: center;
  transition: all var(--transition-normal);
}

.audience-card:hover {
  transform: translateY(-5px);
  border-color: var(--ancient-gold);
  box-shadow: 0 12px 30px rgba(197, 168, 105, 0.2);
}

.audience-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
}

.audience-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--obsidian-900);
  margin-bottom: 8px;
}

.audience-desc {
  font-size: 0.82rem;
  color: var(--obsidian-subtext);
  line-height: 1.6;
}

/* ==========================================================================
   Clash / Clash Party 客户端教程模块 (Tutorial Tabs)
   ========================================================================== */
.tutorial-container {
  background: #FFFFFF;
  border-radius: var(--radius-xl);
  border: 1px solid var(--mithril-border);
  box-shadow: var(--shadow-md);
  padding: 40px;
}

.tutorial-tabs-header {
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--mithril-border);
  padding-bottom: 20px;
  margin-bottom: 32px;
  overflow-x: auto;
}

.tutorial-tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--obsidian-subtext);
  background: var(--bg-surface);
  transition: all var(--transition-fast);
}

.tutorial-tab-btn.active, .tutorial-tab-btn:hover {
  background: var(--obsidian-900);
  color: #FFFFFF;
}

.tutorial-content-panel {
  display: none;
}

.tutorial-content-panel.active {
  display: block;
}

.steps-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid rgba(186, 199, 213, 0.5);
  padding: 24px;
  position: relative;
}

.step-number-badge {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--energy-blue);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.step-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--obsidian-900);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.85rem;
  color: var(--obsidian-subtext);
  line-height: 1.6;
}

.code-snippet-box {
  background: #111418;
  color: #E2E8F0;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  word-break: break-all;
}

.copy-btn {
  color: var(--energy-blue-light);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255,255,255,0.1);
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: var(--energy-blue);
  color: #FFFFFF;
}

/* ==========================================================================
   用户评价与口碑 (Reviews)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--mithril-border);
  padding: 30px;
  box-shadow: var(--shadow-sm);
}

.review-stars {
  color: #F59E0B;
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  font-size: 1rem;
}

.review-text {
  font-size: 0.92rem;
  color: var(--obsidian-subtext);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--mithril-gradient);
  border: 1.5px solid var(--mithril-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--obsidian-900);
}

.reviewer-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--obsidian-900);
}

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

/* ==========================================================================
   常见问题手风琴 (FAQ Accordion)
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--mithril-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(0, 102, 255, 0.4);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--obsidian-900);
  background: transparent;
}

.faq-toggle-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--obsidian-subtext);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(45deg);
  background: var(--energy-blue);
  color: #FFFFFF;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  font-size: 0.92rem;
  color: var(--obsidian-subtext);
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 22px;
}

/* ==========================================================================
   博客文章目录卡片 (Articles Directory Grid)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--mithril-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--energy-blue);
  box-shadow: var(--shadow-lg);
}

.article-card-body {
  padding: 26px 24px 18px;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--obsidian-muted);
  margin-bottom: 12px;
}

.article-category-badge {
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(0, 102, 255, 0.08);
  color: var(--energy-blue);
  font-weight: 700;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--obsidian-900);
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-excerpt {
  font-size: 0.88rem;
  color: var(--obsidian-subtext);
  line-height: 1.65;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  padding: 16px 24px;
  background: var(--bg-secondary);
  border-top: 1px solid rgba(186, 199, 213, 0.4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.article-read-more {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--energy-blue);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-read-time {
  font-size: 0.78rem;
  color: var(--obsidian-muted);
}

/* ==========================================================================
   文章详情页排版与 SEO 样式 (Article Content Styles)
   ========================================================================== */
.article-header-area {
  padding: 60px 0 40px;
  background: radial-gradient(circle at 50% 0%, rgba(0, 102, 255, 0.05) 0%, transparent 60%);
  border-bottom: 1px solid var(--mithril-border);
}

.article-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--obsidian-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.article-breadcrumbs a:hover {
  color: var(--energy-blue);
}

.article-main-title {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--obsidian-900);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.article-meta-detail {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--obsidian-subtext);
  flex-wrap: wrap;
}

.article-body-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  padding: 50px 0 90px;
}

.article-rich-text {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #2D3748;
}

.article-rich-text h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--obsidian-900);
  margin: 48px 0 20px;
  padding-bottom: 10px;
  border-bottom: 1.5px solid var(--mithril-border);
  position: relative;
}

.article-rich-text h2::before {
  content: "";
  position: absolute;
  bottom: -1.5px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--energy-blue);
}

.article-rich-text h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--obsidian-900);
  margin: 32px 0 16px;
}

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

.article-rich-text ul, .article-rich-text ol {
  margin: 18px 0 24px 24px;
}

.article-rich-text ul li {
  list-style-type: disc;
  margin-bottom: 10px;
}

.article-rich-text ol li {
  list-style-type: decimal;
  margin-bottom: 10px;
}

.article-rich-text blockquote {
  background: rgba(0, 102, 255, 0.05);
  border-left: 4px solid var(--energy-blue);
  padding: 18px 24px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 28px 0;
  color: #1A202C;
  font-style: normal;
}

.article-rich-text table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--mithril-border);
}

.article-rich-text th, .article-rich-text td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--mithril-border);
  font-size: 0.92rem;
}

.article-rich-text th {
  background: #EBEAE5;
  font-weight: 700;
  color: var(--obsidian-900);
}

.article-rich-text tr:hover td {
  background: rgba(0, 102, 255, 0.02);
}

.article-callout-box {
  background: linear-gradient(135deg, #F0F6FF 0%, #FAFAF8 100%);
  border: 1px solid rgba(0, 102, 255, 0.25);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 32px 0;
}

.article-sidebar-sticky {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.sidebar-widget {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--mithril-border);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.sidebar-widget-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--obsidian-900);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--mithril-border);
}

/* ==========================================================================
   Footer 页脚与网站地图
   ========================================================================== */
.site-footer {
  background: var(--bg-dark);
  color: #94A3B8;
  padding: 80px 0 36px;
  border-top: 1px solid #232932;
  font-size: 0.9rem;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 56px;
}

.footer-brand-desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: #64748B;
  margin: 16px 0 24px;
  max-width: 320px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 20px;
}

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

.footer-links-list a {
  color: #94A3B8;
  transition: color var(--transition-fast);
}

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

.footer-keywords-cloud {
  padding: 28px 0;
  border-top: 1px solid #1E232B;
  border-bottom: 1px solid #1E232B;
  margin-bottom: 36px;
}

.keywords-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: #64748B;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.keywords-tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.keyword-tag {
  font-size: 0.78rem;
  padding: 4px 10px;
  background: #181D24;
  color: #94A3B8;
  border-radius: var(--radius-sm);
  border: 1px solid #262D37;
  transition: all var(--transition-fast);
}

.keyword-tag:hover {
  color: var(--mint-green);
  border-color: var(--mint-green-dark);
}

.footer-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: #64748B;
}

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

/* ==========================================================================
   动画与关键帧
   ========================================================================== */
@keyframes ringRotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes pulseDot {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

@keyframes energySurge {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(200%); }
}

/* ==========================================================================
   响应式断点 (Media Queries)
   ========================================================================== */
@media (max-width: 1100px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .audience-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: 1fr repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-subtitle {
    margin: 0 auto 36px;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-metrics {
    justify-content: center;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .nodes-matrix-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .article-body-layout {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .audience-grid {
    grid-template-columns: 1fr;
  }
  .nodes-matrix-grid {
    grid-template-columns: 1fr;
  }
  .steps-list {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
}