/* ============================================================
   PTG V2 - 双主题样式系统
   默认浅色（米白+深蓝），data-theme="dark" 切深色
   ============================================================ */

:root, [data-theme="light"] {
  /* 主色 */
  --v2-primary:        #1e3a8a;     /* 深蓝 */
  --v2-primary-light:  #3b5fbd;
  --v2-primary-dark:   #142a66;
  --v2-accent:         #c4a875;     /* 暖金 - 浅色更柔 */
  --v2-accent-light:   #e8d9b5;

  /* 背景 */
  --v2-bg:             #f8f6f1;     /* 米白 */
  --v2-bg-elev:        #ffffff;
  --v2-bg-card:        #ffffff;
  --v2-bg-subtle:      #f1ede4;
  
  /* 文本 */
  --v2-text:           #1a2540;
  --v2-text-soft:      #4a5878;
  --v2-text-muted:     #8a93a8;
  
  /* 边框 */
  --v2-border:         rgba(26, 37, 64, 0.08);
  --v2-border-strong:  rgba(26, 37, 64, 0.16);
  
  /* 渐变 */
  --v2-grad-hero:      
    radial-gradient(ellipse at top right, rgba(196, 168, 117, 0.18), transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(30, 58, 138, 0.12), transparent 50%),
    linear-gradient(135deg, #f8f6f1 0%, #efe8d8 100%);
  --v2-grad-title:     linear-gradient(135deg, #1a2540 0%, #c4a875 100%);
  --v2-grad-card:      linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.6) 100%);
  
  /* 阴影 */
  --v2-shadow-sm:      0 1px 3px rgba(26, 37, 64, 0.06);
  --v2-shadow:         0 4px 12px rgba(26, 37, 64, 0.08);
  --v2-shadow-lg:      0 12px 32px rgba(26, 37, 64, 0.12);
  
  /* 网格纹理颜色 */
  --v2-grid-line:      rgba(26, 37, 64, 0.04);
}

[data-theme="dark"] {
  --v2-primary:        #6b8fdb;
  --v2-primary-light:  #8fa9e3;
  --v2-primary-dark:   #4a6fb8;
  --v2-accent:         #d4af37;
  --v2-accent-light:   #e8c965;

  --v2-bg:             #0a0e1a;
  --v2-bg-elev:        #131827;
  --v2-bg-card:        rgba(255, 255, 255, 0.04);
  --v2-bg-subtle:      rgba(255, 255, 255, 0.02);
  
  --v2-text:           #e8eaf0;
  --v2-text-soft:      #cbd0dc;
  --v2-text-muted:     #8a92a6;
  
  --v2-border:         rgba(255, 255, 255, 0.08);
  --v2-border-strong:  rgba(255, 255, 255, 0.16);
  
  --v2-grad-hero:      
    radial-gradient(ellipse at top right, rgba(212, 175, 55, 0.15), transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(70, 130, 220, 0.12), transparent 50%),
    linear-gradient(135deg, #0a0e1a 0%, #131827 100%);
  --v2-grad-title:     linear-gradient(135deg, #ffffff 0%, #d4af37 100%);
  --v2-grad-card:      linear-gradient(135deg, rgba(255,255,255,0.04) 0%, rgba(255,255,255,0.01) 100%);
  
  --v2-shadow-sm:      0 1px 3px rgba(0, 0, 0, 0.3);
  --v2-shadow:         0 4px 12px rgba(0, 0, 0, 0.3);
  --v2-shadow-lg:      0 12px 32px rgba(0, 0, 0, 0.5);
  
  --v2-grid-line:      rgba(255, 255, 255, 0.03);
}

/* 跟随系统 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --v2-primary:        #6b8fdb;
    --v2-primary-light:  #8fa9e3;
    --v2-accent:         #d4af37;
    --v2-bg:             #0a0e1a;
    --v2-bg-elev:        #131827;
    --v2-bg-card:        rgba(255, 255, 255, 0.04);
    --v2-bg-subtle:      rgba(255, 255, 255, 0.02);
    --v2-text:           #e8eaf0;
    --v2-text-soft:      #cbd0dc;
    --v2-text-muted:     #8a92a6;
    --v2-border:         rgba(255, 255, 255, 0.08);
    --v2-border-strong:  rgba(255, 255, 255, 0.16);
    --v2-grad-hero:      
      radial-gradient(ellipse at top right, rgba(212, 175, 55, 0.15), transparent 50%),
      radial-gradient(ellipse at bottom left, rgba(70, 130, 220, 0.12), transparent 50%),
      linear-gradient(135deg, #0a0e1a 0%, #131827 100%);
    --v2-grad-title:     linear-gradient(135deg, #ffffff 0%, #d4af37 100%);
    --v2-grad-card:      linear-gradient(135deg, rgba(255,255,255,0.04) 0%, rgba(255,255,255,0.01) 100%);
    --v2-shadow-sm:      0 1px 3px rgba(0, 0, 0, 0.3);
    --v2-shadow:         0 4px 12px rgba(0, 0, 0, 0.3);
    --v2-shadow-lg:      0 12px 32px rgba(0, 0, 0, 0.5);
    --v2-grid-line:      rgba(255, 255, 255, 0.03);
  }
}

/* ============================================================
   全局基础 - body 应用 V2 主题
   ============================================================ */
body {
  background: var(--v2-bg) !important;
  color: var(--v2-text) !important;
  transition: background 0.3s, color 0.3s;
}

/* ============================================================
   V2 Header
   ============================================================ */
.v2-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(248, 246, 241, 0.85);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--v2-border);
  transition: background 0.3s, border-color 0.3s;
}
[data-theme="dark"] .v2-header { background: rgba(10, 14, 26, 0.85); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .v2-header { background: rgba(10, 14, 26, 0.85); }
}

.v2-header-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 12px 20px;
  display: flex; align-items: center; gap: 16px;
}
.v2-logo {
  font-size: 18px; font-weight: 800; letter-spacing: -0.01em;
  background: var(--v2-grad-title);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none; flex-shrink: 0;
  white-space: nowrap;
}
.v2-search {
  flex: 1; max-width: 360px; position: relative;
}
.v2-search input {
  width: 100%; padding: 8px 14px 8px 36px;
  background: var(--v2-bg-subtle);
  border: 1px solid var(--v2-border);
  border-radius: 100px; color: var(--v2-text);
  font-size: 13px; transition: all 0.2s;
}
.v2-search input:focus {
  outline: none; border-color: var(--v2-accent);
  background: var(--v2-bg-elev);
  box-shadow: 0 0 0 3px rgba(196, 168, 117, 0.12);
}
.v2-search::before {
  content: "🔍"; position: absolute; left: 12px; top: 50%;
  transform: translateY(-50%); font-size: 13px; opacity: 0.6;
  pointer-events: none;
}
.v2-header-right {
  display: flex; align-items: center; gap: 8px;
  margin-left: auto; flex-shrink: 0;
}
.v2-btn {
  padding: 7px 16px; border-radius: 100px;
  font-size: 13px; font-weight: 500;
  text-decoration: none; transition: all 0.2s;
  white-space: nowrap;
  border: 1px solid transparent; cursor: pointer;
}
.v2-btn-ghost {
  color: var(--v2-text-soft);
  border-color: var(--v2-border);
  background: transparent;
}
.v2-btn-ghost:hover {
  border-color: var(--v2-accent); color: var(--v2-accent);
}
.v2-btn-primary {
  background: var(--v2-primary); color: #fff;
}
.v2-btn-primary:hover {
  background: var(--v2-primary-light);
  transform: translateY(-1px);
}
.v2-theme-toggle {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--v2-bg-subtle);
  border: 1px solid var(--v2-border);
  cursor: pointer; font-size: 16px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: all 0.3s; color: var(--v2-text);
}
.v2-theme-toggle:hover {
  border-color: var(--v2-accent);
  transform: rotate(15deg);
}
.v2-theme-toggle .v2-icon-sun { display: none; }
.v2-theme-toggle .v2-icon-moon { display: inline; }
[data-theme="dark"] .v2-theme-toggle .v2-icon-sun { display: inline; }
[data-theme="dark"] .v2-theme-toggle .v2-icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .v2-theme-toggle .v2-icon-sun { display: inline; }
  :root:not([data-theme="light"]) .v2-theme-toggle .v2-icon-moon { display: none; }
}

@media (max-width: 768px) {
  .v2-header-inner { padding: 10px 14px; gap: 8px; }
  .v2-search { max-width: none; flex: 1; }
  .v2-btn { padding: 6px 12px; font-size: 12px; }
  .v2-search input { font-size: 12px; padding: 7px 12px 7px 32px; }
  .v2-logo { font-size: 16px; }
  /* 移动端隐藏部分按钮，保留登录注册 + 主题切换 */
  .v2-header-right .v2-btn-ghost { display: none; }
}

/* ============================================================
   V2 通用容器 + Section
   ============================================================ */
.v2-wrap { max-width: 1200px; margin: 0 auto; padding: 0 16px; box-sizing: border-box; }
.v2-section { margin: 50px 0; }
.v2-section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 24px; padding-bottom: 14px;
  border-bottom: 1px solid var(--v2-border);
}
.v2-section-title {
  font-size: clamp(20px, 3vw, 26px); font-weight: 700;
  color: var(--v2-text); letter-spacing: -0.01em;
  margin: 0;
}
.v2-section-title::before {
  content: ""; display: inline-block; width: 4px; height: 20px;
  background: linear-gradient(180deg, var(--v2-accent), var(--v2-primary));
  margin-right: 12px; vertical-align: middle;
  border-radius: 2px;
}
.v2-section-more {
  color: var(--v2-text-muted); font-size: 13px; text-decoration: none;
  transition: color 0.2s;
}
.v2-section-more:hover { color: var(--v2-accent); }

/* ============================================================
   V2 Hero
   ============================================================ */
.v2-hero {
  position: relative; overflow: hidden;
  padding: 50px 24px 60px;
  background: var(--v2-grad-hero);
  text-align: center;
  border-bottom: 1px solid var(--v2-border);
}
.v2-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: 
    linear-gradient(var(--v2-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--v2-grid-line) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 70%);
  pointer-events: none;
}
.v2-hero > * { position: relative; z-index: 1; }
.v2-hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 14px; border-radius: 100px;
  background: var(--v2-accent-light);
  border: 1px solid var(--v2-accent);
  color: var(--v2-primary-dark); font-size: 12px; font-weight: 600;
  margin-bottom: 16px;
}
[data-theme="dark"] .v2-hero-badge {
  background: rgba(212, 175, 55, 0.1);
  border-color: rgba(212, 175, 55, 0.3);
  color: var(--v2-accent);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .v2-hero-badge {
    background: rgba(212, 175, 55, 0.1);
    border-color: rgba(212, 175, 55, 0.3);
    color: var(--v2-accent);
  }
}
.v2-hero-badge::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: #22c55e; box-shadow: 0 0 8px #22c55e;
  animation: v2-pulse 2s ease-in-out infinite;
}
@keyframes v2-pulse { 0%,100%{opacity:1} 50%{opacity:.4} }
.v2-hero-title {
  font-size: clamp(28px, 5vw, 48px); font-weight: 800;
  margin: 0 0 12px; line-height: 1.1;
  background: var(--v2-grad-title);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.v2-hero-sub {
  font-size: clamp(13px, 1.6vw, 15px); color: var(--v2-text-soft);
  max-width: 600px; margin: 0 auto 22px; line-height: 1.5;
}
.v2-hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  max-width: 700px; margin: 0 auto;
}
.v2-hero-stat-num {
  font-size: clamp(20px, 3vw, 28px); font-weight: 700;
  color: var(--v2-accent); font-feature-settings: "tnum";
}
.v2-hero-stat-label {
  font-size: 11px; color: var(--v2-text-muted); margin-top: 2px;
}

/* ============================================================
   V2 Quick Cards (核心板块 - 双栏)
   ============================================================ */
.v2-quick-row {
  display: grid; grid-template-columns: 280px 1fr;
  gap: 20px; margin-bottom: 16px;
}
.v2-quick-card {
  position: relative; padding: 24px 20px;
  background: var(--v2-grad-card);
  border: 1px solid var(--v2-border);
  border-radius: 14px;
  color: var(--v2-text);
  text-decoration: none;
  transition: all 0.3s ease;
  overflow: hidden;
  display: flex; flex-direction: column;
}
.v2-quick-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--v2-q-accent, var(--v2-accent));
}
.v2-quick-card::after {
  content: ""; position: absolute; right: -30px; top: -30px;
  width: 100px; height: 100px; border-radius: 50%;
  background: radial-gradient(circle, var(--v2-q-accent, var(--v2-accent)) 0%, transparent 70%);
  opacity: 0.08; transition: all 0.4s;
}
.v2-quick-card:hover {
  transform: translateY(-2px);
  border-color: var(--v2-q-accent, var(--v2-accent));
  box-shadow: var(--v2-shadow-lg);
}
.v2-quick-card:hover::after { opacity: 0.18; transform: scale(1.5); }
.v2-quick-icon {
  font-size: 28px; margin-bottom: 12px;
  display: inline-block; width: 48px; height: 48px;
  line-height: 48px; text-align: center;
  background: var(--v2-bg-subtle);
  border-radius: 10px;
}
.v2-quick-name { font-size: 17px; font-weight: 600; margin-bottom: 4px; color: var(--v2-text); }
.v2-quick-desc { font-size: 12px; color: var(--v2-text-muted); line-height: 1.5; flex: 1; }
.v2-quick-arrow {
  margin-top: 14px; font-size: 13px; color: var(--v2-q-accent, var(--v2-accent));
  display: flex; align-items: center; gap: 4px;
  transition: transform 0.3s;
}
.v2-quick-card:hover .v2-quick-arrow { transform: translateX(4px); }

.v2-quick-posts {
  background: var(--v2-bg-subtle);
  border: 1px solid var(--v2-border);
  border-radius: 14px;
  padding: 16px 20px;
  display: flex; flex-direction: column; gap: 4px;
  justify-content: center;
}
.v2-quick-post {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 0; text-decoration: none; color: inherit;
  border-bottom: 1px dashed var(--v2-border);
  transition: all 0.2s;
}
.v2-quick-post:last-child { border-bottom: none; }
.v2-quick-post:hover { padding-left: 4px; }
.v2-quick-post-num {
  flex-shrink: 0; width: 22px; height: 22px;
  border-radius: 5px; background: var(--v2-accent-light);
  color: var(--v2-primary-dark); font-size: 11px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
[data-theme="dark"] .v2-quick-post-num { background: rgba(212, 175, 55, 0.12); color: var(--v2-accent); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .v2-quick-post-num { background: rgba(212, 175, 55, 0.12); color: var(--v2-accent); }
}
.v2-quick-post-title {
  flex: 1; color: var(--v2-text-soft); font-size: 14px;
  line-height: 1.5;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  transition: color 0.2s;
}
.v2-quick-post:hover .v2-quick-post-title { color: var(--v2-text); }
.v2-quick-post-date {
  flex-shrink: 0; font-size: 11px; color: var(--v2-text-muted);
  font-feature-settings: "tnum";
}
.v2-quick-empty {
  color: var(--v2-text-muted); font-size: 13px; padding: 12px 0; text-align: center;
}

/* ============================================================
   V2 Article Cards
   ============================================================ */
.v2-articles { 
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px;
}
.v2-article-card {
  background: var(--v2-grad-card);
  border: 1px solid var(--v2-border);
  border-radius: 14px;
  padding: 22px;
  transition: all 0.3s;
  color: var(--v2-text);
  text-decoration: none; display: block;
}
.v2-article-card:hover {
  border-color: var(--v2-accent);
  transform: translateY(-2px);
  box-shadow: var(--v2-shadow-lg);
}
.v2-article-cat {
  display: inline-block; padding: 4px 12px; border-radius: 6px;
  background: var(--v2-accent-light); color: var(--v2-primary-dark);
  font-size: 11px; font-weight: 600; letter-spacing: 0.5px;
  margin-bottom: 12px;
}
[data-theme="dark"] .v2-article-cat { background: rgba(212, 175, 55, 0.12); color: var(--v2-accent); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .v2-article-cat { background: rgba(212, 175, 55, 0.12); color: var(--v2-accent); }
}
.v2-article-title {
  font-size: 16px; font-weight: 600; color: var(--v2-text); line-height: 1.4;
  margin-bottom: 10px; 
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.v2-article-meta {
  display: flex; gap: 16px; font-size: 12px; color: var(--v2-text-muted);
  margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--v2-border);
}

/* ============================================================
   响应式：桌面双栏 → 移动单栏
   ============================================================ */
@media (max-width: 768px) {
  .v2-hero-stats { grid-template-columns: repeat(4, 1fr); gap: 8px; }
  .v2-hero-stat-num { font-size: 18px; }
  .v2-hero-stat-label { font-size: 10px; }
  .v2-section-title { font-size: 18px; }
  .v2-quick-row { grid-template-columns: 1fr; gap: 12px; }
  .v2-quick-posts { padding: 12px 16px; }
  .v2-section { margin: 30px 0; }
}

/* ============================================================
   隐藏旧 ptg-* 元素（在 V2 启用时）
   ============================================================ */
body.v2-active .ptg-header,
body.v2-active .ptg-quick-wrap,
body.v2-active .ptg-marquee-wrap,
body.v2-active .ptg-footer,
body.v2-active .ptg-promo-banner,
body.v2-active #ptg-mobile-nav { display: none !important; }

/* ============================================================
   V2 Footer
   ============================================================ */
.v2-footer {
  margin-top: 60px;
  padding: 30px 20px;
  background: var(--v2-bg-elev);
  border-top: 1px solid var(--v2-border);
  text-align: center;
}
.v2-footer-inner {
  max-width: 1200px; margin: 0 auto;
}
.v2-footer-links {
  display: flex; flex-wrap: wrap; gap: 8px 24px;
  justify-content: center; margin-bottom: 14px;
}
.v2-footer-links a {
  color: var(--v2-text-soft); font-size: 13px; text-decoration: none;
  transition: color 0.2s;
}
.v2-footer-links a:hover { color: var(--v2-accent); }
.v2-footer-copy {
  font-size: 12px; color: var(--v2-text-muted);
}

/* ============================================================
   回到顶部 (v2 风格)
   ============================================================ */
.v2-back-top {
  position: fixed; right: 20px; bottom: 20px;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--v2-bg-elev);
  border: 1px solid var(--v2-border);
  color: var(--v2-text); font-size: 18px;
  cursor: pointer; opacity: 0; visibility: hidden;
  transition: all 0.3s; z-index: 99;
  box-shadow: var(--v2-shadow);
}
.v2-back-top.visible { opacity: 1; visibility: visible; }
.v2-back-top:hover {
  background: var(--v2-accent);
  color: #fff; transform: translateY(-3px);
}
/* 覆盖前面的移动端规则 */
@media (max-width: 768px) {
  .v2-header-inner { padding: 10px 12px; gap: 6px; }
  .v2-search { max-width: none; flex: 1; min-width: 0; }
  .v2-search input { font-size: 12px; padding: 7px 12px 7px 32px; }
  .v2-logo { font-size: 14px; }
  .v2-header-right { gap: 4px; }
  
  /* ⚠️ 移除"移动端隐藏登录"，改为图标显示 */
  .v2-header-right .v2-btn-ghost,
  .v2-header-right .v2-btn-primary { 
      display: inline-flex; padding: 6px 10px; font-size: 12px; gap: 4px;
  }
  
  /* 移动端隐藏文字标签，仅图标 */
  .v2-btn-label { display: none; }
  .v2-btn-icon { font-size: 14px; }
  .v2-btn-login .v2-btn-label { 
      display: inline; font-size: 12px;  /* 登录按钮保留文字（最重要） */
  }
  
  /* 个人中心和退出在移动端只显示图标 */
  .v2-btn { padding: 6px 10px; }
  
  /* 主题切换按钮缩小 */
  .v2-theme-toggle { width: 32px; height: 32px; font-size: 14px; }
}

/* 桌面端 - 显示文字 */
@media (min-width: 769px) {
  .v2-btn-icon { display: none; }
  .v2-btn-login .v2-btn-icon { display: inline; }  /* 登录按钮始终带图标 */
}

/* 退出按钮 hover 红色提示 */
.v2-btn-logout:hover {
  border-color: #ef4444 !important;
  color: #ef4444 !important;
}

/* ============================================================
   Hero 8 入口卡片可点击 + 多板块
   ============================================================ */
.v2-hero-stats {
  grid-template-columns: repeat(3, 1fr) !important;
  max-width: 800px !important;
}
@media (max-width: 768px) {
  .v2-hero-stats { grid-template-columns: repeat(3, 1fr) !important; gap: 6px !important; }
}

.v2-hero-stat {
  display: block; text-decoration: none;
  padding: 14px 10px; border-radius: 12px;
  background: var(--v2-bg-card);
  border: 1px solid var(--v2-border);
  transition: all 0.25s ease;
  cursor: pointer;
  color: inherit;
}
.v2-hero-stat:hover {
  transform: translateY(-3px);
  border-color: var(--v2-accent);
  box-shadow: var(--v2-shadow);
}
.v2-hero-stat-icon { font-size: 20px; margin-bottom: 4px; display: block; }
.v2-hero-stat-num { 
  font-size: clamp(18px, 2.6vw, 24px); 
  font-weight: 800; color: var(--v2-accent);
  font-feature-settings: "tnum"; line-height: 1.1;
}
.v2-hero-stat-label { 
  font-size: 11px; color: var(--v2-text-muted); margin-top: 2px;
  font-weight: 500;
}
.v2-hero-stat:hover .v2-hero-stat-label { color: var(--v2-text); }

/* 板块横排（次要功能） */
.v2-feature-row {
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin: 0 0 30px;
}
.v2-feature-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; border-radius: 12px;
  background: var(--v2-bg-card);
  border: 1px solid var(--v2-border);
  text-decoration: none; color: var(--v2-text);
  transition: all 0.25s;
  position: relative; overflow: hidden;
}
.v2-feature-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px; background: var(--v2-f-accent, var(--v2-accent));
  transform: scaleY(0); transform-origin: top;
  transition: transform 0.3s;
}
.v2-feature-card:hover {
  border-color: var(--v2-f-accent, var(--v2-accent));
  transform: translateX(2px);
  box-shadow: var(--v2-shadow);
}
.v2-feature-card:hover::before { transform: scaleY(1); }
.v2-feature-icon {
  flex-shrink: 0; width: 38px; height: 38px;
  border-radius: 10px; background: var(--v2-bg-subtle);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
}
.v2-feature-content { min-width: 0; }
.v2-feature-name { font-size: 13px; font-weight: 600; color: var(--v2-text); }
.v2-feature-desc { font-size: 11px; color: var(--v2-text-muted); margin-top: 1px; }

/* ============================================================
   V3 阶段 2 - 分类归档 / 文章详情 / 普通页面
   ============================================================ */

/* 通用面包屑 */
.v3-breadcrumb { font-size: 12px; color: var(--v2-text-muted); margin-bottom: 12px; }
.v3-breadcrumb a { color: var(--v2-text-muted); text-decoration: none; transition: color 0.2s; }
.v3-breadcrumb a:hover { color: var(--v2-accent); }
.v3-bc-sep { margin: 0 8px; opacity: 0.5; }

/* ===== 分类页 Banner ===== */
.v3-cat-banner {
  padding: 36px 24px;
  background: 
    radial-gradient(ellipse at top right, rgba(196, 168, 117, 0.18), transparent 50%),
    linear-gradient(135deg, var(--v2-bg-subtle) 0%, var(--v2-bg) 100%);
  border-bottom: 1px solid var(--v2-border);
  position: relative; overflow: hidden;
}
[data-theme="dark"] .v3-cat-banner,
:root:not([data-theme="light"]) .v3-cat-banner {
  background: 
    radial-gradient(ellipse at top right, rgba(212, 175, 55, 0.15), transparent 50%),
    linear-gradient(135deg, #0a0e1a 0%, #131827 100%);
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .v3-cat-banner {
    background: 
      radial-gradient(ellipse at top right, rgba(196, 168, 117, 0.18), transparent 50%),
      linear-gradient(135deg, var(--v2-bg-subtle) 0%, var(--v2-bg) 100%);
  }
}
.v3-cat-banner::before {
  content: ""; position: absolute; inset: 0;
  background-image: 
    linear-gradient(var(--v2-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--v2-grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
  pointer-events: none;
}
.v3-cat-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 16px;
  position: relative; z-index: 1;
}
.v3-cat-title {
  font-size: clamp(28px, 4vw, 40px); font-weight: 800;
  margin: 0 0 8px;
  background: var(--v2-grad-title);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.v3-cat-desc {
  font-size: 14px; color: var(--v2-text-soft); max-width: 600px;
  line-height: 1.6; margin: 0 0 16px;
}
.v3-cat-meta {
  display: flex; gap: 20px; font-size: 13px; color: var(--v2-text-muted);
  flex-wrap: wrap;
}
.v3-cat-meta b { color: var(--v2-accent); font-weight: 700; font-size: 16px; margin-right: 4px; }
.v3-cat-live { color: #22c55e; }

/* 子标签筛选 */
.v3-subnav {
  display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0;
}
.v3-subnav-item {
  padding: 7px 16px; border-radius: 100px;
  background: var(--v2-bg-card); border: 1px solid var(--v2-border);
  color: var(--v2-text-soft); font-size: 13px;
  text-decoration: none; transition: all 0.2s;
}
.v3-subnav-item:hover, .v3-subnav-item.active {
  background: var(--v2-accent-light);
  border-color: var(--v2-accent);
  color: var(--v2-primary-dark);
}
[data-theme="dark"] .v3-subnav-item:hover, [data-theme="dark"] .v3-subnav-item.active,
:root:not([data-theme="light"]) .v3-subnav-item:hover, :root:not([data-theme="light"]) .v3-subnav-item.active {
  background: rgba(212, 175, 55, 0.12);
  color: var(--v2-accent);
}

/* 文章列表 - 行式紧凑卡片 */
.v3-post-list { display: flex; flex-direction: column; gap: 12px; }
.v3-post-row {
  display: grid; grid-template-columns: 60px 1fr auto; gap: 18px;
  align-items: center;
  padding: 16px 20px;
  background: var(--v2-grad-card);
  border: 1px solid var(--v2-border);
  border-radius: 12px;
  text-decoration: none; color: inherit;
  transition: all 0.3s;
}
.v3-post-row:hover {
  border-color: var(--v2-accent);
  transform: translateX(4px);
  box-shadow: var(--v2-shadow);
}
.v3-post-num {
  font-size: 22px; font-weight: 800; color: var(--v2-accent);
  font-feature-settings: "tnum"; opacity: 0.7;
}
.v3-post-main { min-width: 0; }
.v3-post-title {
  font-size: 16px; font-weight: 600; color: var(--v2-text);
  line-height: 1.4; margin-bottom: 6px;
  overflow: hidden; text-overflow: ellipsis;
  display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical;
}
.v3-post-row:hover .v3-post-title { color: var(--v2-accent); }
.v3-post-excerpt {
  font-size: 13px; color: var(--v2-text-muted); line-height: 1.5;
  overflow: hidden; text-overflow: ellipsis;
  display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical;
}
.v3-post-side {
  text-align: right; flex-shrink: 0;
  font-size: 12px; color: var(--v2-text-muted);
  font-feature-settings: "tnum";
}
.v3-post-side time { display: block; font-weight: 600; color: var(--v2-text-soft); }

/* 分页 */
.v3-pagination {
  display: flex; justify-content: center; gap: 8px;
  margin: 40px 0;
}
.v3-page-btn {
  min-width: 38px; height: 38px; padding: 0 14px;
  background: var(--v2-bg-card); border: 1px solid var(--v2-border);
  color: var(--v2-text-soft); border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; transition: all 0.2s;
  text-decoration: none;
}
.v3-page-btn:hover { background: var(--v2-accent-light); color: var(--v2-accent); }
.v3-page-btn.active { background: var(--v2-accent); color: #fff; font-weight: 700; }

@media (max-width: 768px) {
  .v3-post-row { grid-template-columns: 40px 1fr; gap: 12px; padding: 14px 16px; }
  .v3-post-side { display: none; }
  .v3-post-num { font-size: 18px; }
  .v3-post-title { font-size: 14px; }
}

/* ===== 文章详情 - Hero（深色感觉）+ 渐变过渡 ===== */
.v3-art-hero {
  padding: 50px 24px 60px;
  background:
    radial-gradient(ellipse at top right, rgba(196, 168, 117, 0.15), transparent 60%),
    linear-gradient(135deg, var(--v2-bg-subtle) 0%, var(--v2-bg) 100%);
  position: relative; overflow: hidden;
}
[data-theme="dark"] .v3-art-hero,
:root:not([data-theme="light"]) .v3-art-hero {
  background:
    radial-gradient(ellipse at top right, rgba(212, 175, 55, 0.18), transparent 60%),
    linear-gradient(135deg, #0a0e1a 0%, #131827 100%);
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .v3-art-hero {
    background:
      radial-gradient(ellipse at top right, rgba(196, 168, 117, 0.15), transparent 60%),
      linear-gradient(135deg, var(--v2-bg-subtle) 0%, var(--v2-bg) 100%);
  }
}
.v3-art-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: 
    linear-gradient(var(--v2-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--v2-grid-line) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at top right, #000 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at top right, #000 0%, transparent 70%);
  pointer-events: none;
}
.v3-art-hero-inner {
  max-width: 720px; margin: 0 auto; padding: 0 16px;
  position: relative; z-index: 1;
}
.v3-art-cat-tag {
  display: inline-block; padding: 4px 14px; border-radius: 100px;
  background: var(--v2-accent-light); color: var(--v2-primary-dark);
  font-size: 12px; font-weight: 600; margin-bottom: 12px;
  text-decoration: none;
}
[data-theme="dark"] .v3-art-cat-tag,
:root:not([data-theme="light"]) .v3-art-cat-tag {
  background: rgba(212, 175, 55, 0.12); color: var(--v2-accent);
}
.v3-art-title {
  font-size: clamp(24px, 3.5vw, 36px); font-weight: 800;
  color: var(--v2-text); line-height: 1.25; margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.v3-art-meta {
  display: flex; flex-wrap: wrap; gap: 16px;
  font-size: 13px; color: var(--v2-text-muted);
}
.v3-art-meta-item { display: inline-flex; align-items: center; gap: 6px; }
.v3-art-meta-item b { color: var(--v2-text-soft); font-weight: 500; }

/* 渐变过渡条 */
.v3-art-fade {
  height: 60px;
  background: linear-gradient(180deg, transparent 0%, var(--v2-bg) 100%);
  margin-top: -60px;
  position: relative;
  pointer-events: none;
  z-index: 2;
}

/* 文章主体 */
.v3-art-wrap { max-width: 720px; margin: 0 auto; padding: 0 16px; }
.v3-art-body {
  margin: 30px 0;
  font-size: 16px; line-height: 1.85;
  color: var(--v2-text-soft);
}
.v3-art-body p { margin: 0 0 18px; }
.v3-art-body h2 {
  font-size: 22px; color: var(--v2-text); margin: 36px 0 14px;
  padding-left: 12px;
  border-left: 3px solid var(--v2-accent);
}
.v3-art-body h3 { font-size: 18px; color: var(--v2-text); margin: 24px 0 10px; }
.v3-art-body strong { color: var(--v2-accent); }
.v3-art-body code {
  background: var(--v2-accent-light); color: var(--v2-primary-dark);
  padding: 2px 6px; border-radius: 4px;
  font-family: "JetBrains Mono", Consolas, monospace; font-size: 14px;
}
[data-theme="dark"] .v3-art-body code,
:root:not([data-theme="light"]) .v3-art-body code {
  background: rgba(212, 175, 55, 0.1); color: var(--v2-accent);
}
.v3-art-body pre {
  background: var(--v2-bg-elev); border: 1px solid var(--v2-border);
  border-radius: 10px; padding: 18px;
  overflow-x: auto; margin: 18px 0;
}
.v3-art-body pre code { background: none; color: var(--v2-text-soft); padding: 0; }
.v3-art-body blockquote {
  margin: 18px 0; padding: 14px 22px;
  background: var(--v2-bg-subtle);
  border-left: 4px solid var(--v2-accent);
  border-radius: 8px; color: var(--v2-text-soft);
}
.v3-art-body img {
  max-width: 100%; border-radius: 12px;
  margin: 18px 0; display: block;
}
.v3-art-body a { 
  color: var(--v2-accent); 
  border-bottom: 1px solid var(--v2-accent); 
  text-decoration: none;
}
.v3-art-body a:hover { background: var(--v2-accent-light); }

/* 浮动工具栏 */
.v3-art-toolbar {
  position: sticky; bottom: 16px; left: 50%; 
  transform: translateX(-50%);
  display: flex; gap: 6px; padding: 8px;
  background: var(--v2-bg-elev); border: 1px solid var(--v2-border);
  border-radius: 100px; backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--v2-shadow-lg);
  width: max-content; margin: 24px auto;
  z-index: 10;
}
.v3-art-tool-btn {
  width: 38px; height: 38px; border-radius: 50%;
  background: transparent; border: none;
  color: var(--v2-text-soft); font-size: 16px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.v3-art-tool-btn:hover { background: var(--v2-accent-light); color: var(--v2-accent); }
[data-theme="dark"] .v3-art-tool-btn:hover,
:root:not([data-theme="light"]) .v3-art-tool-btn:hover {
  background: rgba(212, 175, 55, 0.15);
}

/* 相关推荐 */
.v3-related {
  margin: 50px 0 30px;
  padding-top: 30px; border-top: 1px solid var(--v2-border);
}
.v3-related h3 { font-size: 18px; color: var(--v2-text); margin: 0 0 18px; }
.v3-related h3::before {
  content: ""; display: inline-block; width: 4px; height: 18px;
  background: var(--v2-accent); margin-right: 10px; vertical-align: middle;
  border-radius: 2px;
}
.v3-related-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}
.v3-related-item {
  padding: 16px 18px;
  background: var(--v2-grad-card); border: 1px solid var(--v2-border);
  border-radius: 10px; transition: all 0.2s;
  text-decoration: none; display: block;
}
.v3-related-item:hover {
  border-color: var(--v2-accent);
  transform: translateY(-2px);
}
.v3-related-cat {
  font-size: 11px; color: var(--v2-accent); font-weight: 600; 
  margin-bottom: 6px; letter-spacing: 0.5px;
}
.v3-related-title {
  font-size: 14px; color: var(--v2-text); line-height: 1.5;
  overflow: hidden; text-overflow: ellipsis;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
}

/* ===== 普通页面 Hero（小） ===== */
.v3-page-hero {
  padding: 30px 24px;
  background: var(--v2-grad-hero);
  border-bottom: 1px solid var(--v2-border);
}
.v3-page-hero-inner {
  max-width: 720px; margin: 0 auto; padding: 0 16px;
}
.v3-page-title {
  font-size: clamp(22px, 3vw, 30px); font-weight: 800;
  color: var(--v2-text); margin: 0 0 6px;
}
.v3-page-sub {
  font-size: 14px; color: var(--v2-text-muted); margin: 0;
}

/* 普通页面卡片容器 */
.v3-page-card {
  background: var(--v2-bg-card); border: 1px solid var(--v2-border);
  border-radius: 14px; overflow: hidden;
  box-shadow: var(--v2-shadow-sm);
}
.v3-page-card-bar {
  height: 4px; background: linear-gradient(90deg, var(--v2-primary), var(--v2-accent));
}
.v3-page-card-body { padding: 28px 28px; }
@media (max-width: 768px) {
  .v3-page-card-body { padding: 22px 20px; }
}