/* ============================================================
   云果短剧 kleonelin.cn — 全站样式表
   风格：深空渐变 + 霓虹玫红点缀 + 毛玻璃质感
   支持：响应式 / 暗色模式 / 滚动动画 / hover 动效
   ============================================================ */

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

/* ===== Design Tokens ===== */
:root {
  --primary: #1a1a2e;
  --primary-light: #16213e;
  --primary-deep: #0f3460;
  --accent: #e94560;
  --accent-hover: #ff6b81;
  --accent-soft: rgba(233, 69, 96, 0.12);
  --accent-glow: rgba(233, 69, 96, 0.38);

  --bg: #f6f7fb;
  --bg-alt: #eef0f7;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);

  --text: #23262f;
  --text-light: #64708a;
  --text-muted: #8b95ab;

  --border: #e4e7ef;
  --border-soft: rgba(0, 0, 0, 0.06);

  --shadow-sm: 0 1px 3px rgba(23, 26, 40, 0.06);
  --shadow: 0 6px 24px rgba(23, 26, 40, 0.08);
  --shadow-lg: 0 18px 48px rgba(23, 26, 40, 0.14);
  --shadow-accent: 0 8px 26px rgba(233, 69, 96, 0.28);

  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  --transition: 0.32s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);

  --max-width: 1200px;
  --header-h: 64px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --grad-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 48%, #0f3460 100%);
  --grad-accent: linear-gradient(135deg, #e94560 0%, #ff6b81 100%);
  --grad-cool: linear-gradient(135deg, #0f3460 0%, #16213e 100%);
  --grad-mixed: linear-gradient(135deg, #e94560 0%, #0f3460 100%);
}

/* ===== Dark Mode ===== */
body.dark-mode {
  --bg: #0c0c16;
  --bg-alt: #11111f;
  --bg-card: #171728;
  --bg-glass: rgba(23, 23, 40, 0.72);

  --text: #e9eaf2;
  --text-light: #a3aac2;
  --text-muted: #7b8299;

  --border: #262640;
  --border-soft: rgba(255, 255, 255, 0.07);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
  --shadow-accent: 0 8px 26px rgba(233, 69, 96, 0.35);
}

/* ===== Base ===== */
html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

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

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

ul, ol { list-style: none; }

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

input, textarea, select { font-family: inherit; }

::selection {
  background: var(--accent);
  color: #fff;
}

/* 滚动条美化 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-alt); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent), var(--primary-deep));
  border-radius: var(--radius-pill);
  border: 2px solid var(--bg-alt);
}
::-webkit-scrollbar-thumb:hover { background: var(--accent-hover); }

/* ===== Layout Utility ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section { padding: 72px 0; position: relative; }

.section-header { margin-bottom: 40px; }

.section-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 14px;
  position: relative;
  display: inline-block;
  letter-spacing: -0.4px;
  line-height: 1.3;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 52px;
  height: 4px;
  background: var(--grad-accent);
  border-radius: var(--radius-pill);
  box-shadow: 0 2px 10px var(--accent-glow);
}

.section-subtitle {
  font-size: 0.96rem;
  color: var(--text-light);
  margin-top: 14px;
  max-width: 720px;
  line-height: 1.8;
}

.text-center { text-align: center; }
.text-center .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}
.text-center .section-subtitle { margin-left: auto; margin-right: auto; }

/* ===== Header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(20, 20, 38, 0.78);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  transition: box-shadow var(--transition), background var(--transition);
}
.header.scrolled {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  background: rgba(16, 16, 32, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 20px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.22rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.4px;
  flex-shrink: 0;
  transition: transform var(--transition);
}
.logo:hover { transform: scale(1.03); color: #fff; }
.logo svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  filter: drop-shadow(0 4px 12px var(--accent-glow));
  transition: transform var(--transition);
}
.logo:hover svg { transform: rotate(-6deg); }
.logo span { color: var(--accent); }

/* Nav */
.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
}
.nav-links a {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  white-space: nowrap;
  transition: color var(--transition-fast);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--grad-accent);
  border-radius: var(--radius-pill);
  transition: width var(--transition);
}
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { width: 100%; }

/* Header actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.search-box:focus-within {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(233, 69, 96, 0.5);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.18);
}
.search-box input {
  background: transparent;
  border: none;
  outline: none;
  color: #fff;
  font-size: 0.85rem;
  width: 120px;
  transition: width var(--transition);
}
.search-box input::placeholder { color: rgba(255, 255, 255, 0.45); }
.search-box input:focus { width: 180px; }
.search-box button {
  color: rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  padding: 2px;
  transition: color var(--transition-fast), transform var(--transition-fast);
}
.search-box button:hover {
  color: var(--accent);
  transform: scale(1.12);
}

.theme-toggle,
.mobile-menu-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.78);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}
.theme-toggle:hover,
.mobile-menu-btn:hover {
  background: rgba(233, 69, 96, 0.22);
  color: #fff;
  transform: translateY(-2px) rotate(8deg);
}
.theme-toggle svg { width: 18px; height: 18px; }
.mobile-menu-btn { display: none; }
.mobile-menu-btn svg { width: 20px; height: 20px; }

/* ===== Breadcrumb ===== */
.breadcrumb {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
  font-size: 0.82rem;
  color: var(--text-light);
  transition: background var(--transition), border-color var(--transition);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb li::after {
  content: '›';
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1;
}
.breadcrumb li:last-child::after { display: none; }
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb [aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

/* ===== Hero ===== */
.hero {
  background: var(--grad-hero);
  color: #fff;
  padding: 88px 0 80px;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 640px;
  height: 640px;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.22) 0%, transparent 68%);
  pointer-events: none;
  animation: heroFloat 14s ease-in-out infinite;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -35%;
  left: -12%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(15, 52, 96, 0.5) 0%, transparent 70%);
  pointer-events: none;
  animation: heroFloat 18s ease-in-out infinite reverse;
}
@keyframes heroFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-24px, 28px) scale(1.08); }
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 52px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.24;
  margin-bottom: 22px;
  letter-spacing: -0.8px;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}
.hero-content h1 em {
  font-style: normal;
  color: var(--accent);
  position: relative;
  display: inline-block;
}
.hero-content h1 em::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 100%;
  height: 10px;
  background: rgba(233, 69, 96, 0.28);
  border-radius: var(--radius-pill);
  z-index: -1;
  transform: scaleX(0);
  transform-origin: left;
  animation: underlineIn 0.9s 0.4s var(--transition-slow) forwards;
}
@keyframes underlineIn {
  to { transform: scaleX(1); }
}

.hero-desc {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 30px;
  line-height: 1.85;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
    background var(--transition), color var(--transition), border-color var(--transition);
}
.btn svg { flex-shrink: 0; }

.btn-primary {
  background: var(--grad-accent);
  color: #fff;
  box-shadow: var(--shadow-accent);
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 20%, rgba(255, 255, 255, 0.35) 50%, transparent 80%);
  transform: translateX(-120%);
  transition: transform 0.7s ease;
}
.btn-primary:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(233, 69, 96, 0.5);
}
.btn-primary:hover::before { transform: translateX(120%); }

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.32);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.btn-outline:hover {
  border-color: #fff;
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-3px);
}

/* Hero visual */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: heroVisualIn 1s var(--transition-slow) both;
}
@keyframes heroVisualIn {
  from { opacity: 0; transform: translateY(28px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.hero-visual svg {
  width: 100%;
  max-width: 500px;
  height: auto;
  filter: drop-shadow(0 24px 48px rgba(0, 0, 0, 0.45));
  animation: heroPulse 6s ease-in-out infinite;
}
@keyframes heroPulse {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ===== Stats Bar ===== */
.stats-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 36px 0;
  transition: background var(--transition), border-color var(--transition);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item {
  position: relative;
  padding: 8px 12px;
  border-radius: var(--radius);
  transition: transform var(--transition), background var(--transition);
}
.stat-item:hover {
  transform: translateY(-4px);
  background: var(--accent-soft);
}
.stat-item h3 {
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1.2;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent);
}
.stat-item p {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 6px;
  font-weight: 500;
}

/* ===== Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition), background var(--transition);
}
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.28);
}
.card:hover::before { transform: scaleX(1); }

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.18);
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover .card-icon {
  transform: scale(1.08) rotate(-4deg);
  box-shadow: 0 12px 28px rgba(233, 69, 96, 0.32);
}
.card h3 {
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
  transition: color var(--transition-fast);
}
.card:hover h3 { color: var(--accent); }
.card p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.75;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: start;
}

.about-text h3 {
  font-size: 1.32rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
  letter-spacing: -0.3px;
}
.about-text p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 16px;
}
.about-text p:last-child { margin-bottom: 0; }

.about-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 26px;
}
.feature-tag {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text);
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), border-color var(--transition),
    background var(--transition), box-shadow var(--transition);
}
.feature-tag:hover {
  transform: translateY(-3px);
  border-color: rgba(233, 69, 96, 0.4);
  background: var(--accent-soft);
  box-shadow: var(--shadow-sm);
}
.feature-tag svg {
  width: 16px;
  height: 16px;
  color: var(--accent);
  flex-shrink: 0;
}

.about-visual {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: background var(--transition), border-color var(--transition),
    box-shadow var(--transition);
}
.about-visual::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.16) 0%, transparent 70%);
  pointer-events: none;
}
.about-visual svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  transition: transform var(--transition);
}
.about-visual:hover svg { transform: scale(1.02); }

.about-visual .info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
}
.about-visual .info-row:last-child { border-bottom: none; }
.about-visual .info-label { color: var(--text-light); flex-shrink: 0; }
.about-visual .info-value {
  color: var(--text);
  font-weight: 600;
  text-align: right;
}

/* ===== Articles ===== */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition), background var(--transition);
}
.article-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid transparent;
  background: var(--grad-accent) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}
.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}
.article-card:hover::after { opacity: 1; }

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}
.article-meta .tag {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  letter-spacing: 0.2px;
}

.article-card h3 {
  font-size: 1.06rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.5;
  color: var(--text);
  transition: color var(--transition-fast);
}
.article-card h3 a { color: inherit; }
.article-card:hover h3 { color: var(--accent); }

.article-card p {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.75;
  flex: 1;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card .read-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition), color var(--transition-fast);
}
.article-card .read-more:hover { gap: 10px; color: var(--accent-hover); }

/* ===== FAQ ===== */
.faq-list {
  max-width: 880px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition),
    background var(--transition);
}
.faq-item:hover { border-color: rgba(233, 69, 96, 0.28); }
.faq-item.active {
  border-color: rgba(233, 69, 96, 0.45);
  box-shadow: 0 8px 26px rgba(233, 69, 96, 0.12);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.faq-question:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.faq-question .faq-icon {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.05rem;
  line-height: 1;
  color: var(--text-light);
  transition: transform var(--transition), background var(--transition),
    color var(--transition);
}
.faq-item.active .faq-icon {
  transform: rotate(135deg);
  background: var(--grad-accent);
  color: #fff;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}
.faq-item.active .faq-answer { max-height: 560px; }

.faq-answer-inner {
  padding: 0 22px 22px;
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.85;
  border-top: 1px dashed var(--border);
  margin-top: 2px;
  padding-top: 16px;
}

/* ===== HowTo ===== */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 26px;
  counter-reset: step;
}

.howto-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px 26px;
  position: relative;
  counter-increment: step;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition), background var(--transition);
}
.howto-step::before {
  content: counter(step);
  position: absolute;
  top: -16px;
  left: 24px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--grad-accent);
  color: #fff;
  font-size: 0.88rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px var(--accent-glow);
  transition: transform var(--transition);
}
.howto-step:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.3);
}
.howto-step:hover::before { transform: scale(1.12) rotate(-8deg); }

.howto-step h3 {
  font-size: 1.02rem;
  font-weight: 700;
  margin: 10px 0 10px;
  color: var(--text);
}
.howto-step p {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.78;
}

/* HowTo 注意事项 */
.howto-note {
  max-width: 880px;
  margin: 44px auto 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 28px 26px;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), border-color var(--transition);
}
.howto-note h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
}
.howto-note ul {
  list-style: none;
  padding-left: 0;
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.9;
}
.howto-note li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 8px;
}
.howto-note li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--grad-accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.howto-note li:last-child { margin-bottom: 0; }

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition), background var(--transition);
}
.contact-card::before {
  content: '';
  position: absolute;
  bottom: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.14) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}
.contact-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.3);
}
.contact-card:hover::before { opacity: 1; }

.contact-card svg {
  width: 42px;
  height: 42px;
  margin: 0 auto 16px;
  color: var(--accent);
  padding: 10px;
  border-radius: 14px;
  background: var(--accent-soft);
  transition: transform var(--transition), background var(--transition);
}
.contact-card:hover svg {
  transform: scale(1.1) rotate(-6deg);
  background: var(--grad-accent);
  color: #fff;
}
.contact-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}
.contact-card p {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.65;
}
.contact-card a {
  color: var(--accent);
  font-weight: 600;
  word-break: break-all;
}
.contact-card a:hover { color: var(--accent-hover); }

/* ===== Footer ===== */
.footer {
  background: linear-gradient(180deg, #12122a 0%, #0b0b18 100%);
  color: rgba(255, 255, 255, 0.7);
  padding: 60px 0 0;
  position: relative;
  overflow: hidden;
}
.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(233, 69, 96, 0.6), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .logo { margin-bottom: 18px; }
.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.5);
  max-width: 340px;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 10px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 26px;
  height: 2px;
  background: var(--grad-accent);
  border-radius: var(--radius-pill);
}
.footer-col ul li { margin-bottom: 11px; }
.footer-col ul li a {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.52);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}
.footer-col ul li a:hover {
  color: var(--accent);
  padding-left: 6px;
}

.footer-bottom {
  padding: 26px 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
}
.footer-bottom a { color: rgba(255, 255, 255, 0.5); }
.footer-bottom a:hover { color: var(--accent); }

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--grad-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-accent);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px) scale(0.9);
  transition: opacity var(--transition), visibility var(--transition),
    transform var(--transition), box-shadow var(--transition);
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}
.back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 14px 34px rgba(233, 69, 96, 0.55);
}
.back-to-top svg { width: 20px; height: 20px; }

/* ===== Scroll Animation ===== */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 依次延迟，形成错落感 */
.card-grid .fade-in:nth-child(2),
.article-list .fade-in:nth-child(2),
.howto-steps .fade-in:nth-child(2),
.contact-grid .fade-in:nth-child(2) { transition-delay: 0.08s; }
.card-grid .fade-in:nth-child(3),
.article-list .fade-in:nth-child(3),
.howto-steps .fade-in:nth-child(3),
.contact-grid .fade-in:nth-child(3) { transition-delay: 0.16s; }
.card-grid .fade-in:nth-child(4),
.article-list .fade-in:nth-child(4),
.howto-steps .fade-in:nth-child(4),
.contact-grid .fade-in:nth-child(4) { transition-delay: 0.24s; }
.card-grid .fade-in:nth-child(5),
.article-list .fade-in:nth-child(5),
.howto-steps .fade-in:nth-child(5) { transition-delay: 0.32s; }
.card-grid .fade-in:nth-child(6),
.article-list .fade-in:nth-child(6) { transition-delay: 0.40s; }
.article-list .fade-in:nth-child(n+7) { transition-delay: 0.1s; }

/* ===== 无障碍 / 减少动效 ===== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .fade-in { opacity: 1; transform: none; }
}

/* ===== 焦点可见性 ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

/* ============================================================
   响应式 — 平板
   ============================================================ */
@media (max-width: 992px) {
  .hero { padding: 68px 0 60px; }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .hero-visual { order: -1; }
  .hero-visual svg { max-width: 380px; }
  .hero-content h1 { font-size: 2.1rem; }
  .hero-desc { max-width: 100%; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .footer-brand { grid-column: 1 / -1; }
}

/* ============================================================
   响应式 — 手机
   ============================================================ */
@media (max-width: 768px) {
  .section { padding: 48px 0; }
  .section-header { margin-bottom: 30px; }
  .section-title { font-size: 1.4rem; }
  .section-subtitle { font-size: 0.9rem; }

  /* 导航折叠 */
  .nav-links { display: none; }
  .mobile-menu-btn { display: flex; }

  .search-box input { width: 84px; }
  .search-box input:focus { width: 130px; }

  .hero { padding: 52px 0 48px; }
  .hero-content h1 { font-size: 1.72rem; letter-spacing: -0.4px; }
  .hero-desc { font-size: 0.94rem; margin-bottom: 24px; }
  .hero-visual svg { max-width: 300px; }

  .stats-bar { padding: 26px 0; }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .stat-item h3 { font-size: 1.6rem; }

  .card-grid,
  .article-list,
  .howto-steps,
  .contact-grid { grid-template-columns: 1fr; }

  .about-features { grid-template-columns: 1fr; }

  .about-visual { padding: 24px 20px; }
  .about-visual .info-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .about-visual .info-value { text-align: left; }

  .article-card p { -webkit-line-clamp: 4; }

  .faq-question { padding: 16px 18px; font-size: 0.9rem; }
  .faq-answer-inner { padding: 14px 18px 20px; }

  .howto-step { padding: 28px 20px 22px; }

  .footer { padding-top: 48px; }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-bottom: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .footer-links { justify-content: center; }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}

/* ============================================================
   响应式 — 小屏手机
   ============================================================ */
@media (max-width: 480px) {
  .container { padding: 0 16px; }

  .hero-content h1 { font-size: 1.48rem; }
  .hero-actions { flex-direction: column; width: 100%; }
  .btn { width: 100%; }

  .logo { font-size: 1.08rem; }
  .logo svg { width: 32px; height: 32px; }

  .search-box { padding: 5px 10px; }
  .search-box input { width: 64px; font-size: 0.8rem; }
  .search-box input:focus { width: 96px; }

  .theme-toggle,
  .mobile-menu-btn { width: 34px; height: 34px; }

  .stat-item h3 { font-size: 1.4rem; }
  .stat-item p { font-size: 0.78rem; }

  .card { padding: 24px 20px; }
  .contact-card { padding: 26px 20px; }

  .section-title { font-size: 1.26rem; }
}

/* ============================================================
   深色模式下的局部微调
   ============================================================ */
body.dark-mode .header {
  background: rgba(12, 12, 22, 0.8);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}
body.dark-mode .header.scrolled {
  background: rgba(10, 10, 20, 0.92);
}
body.dark-mode .hero {
  background: linear-gradient(135deg, #0c0c16 0%, #11112a 48%, #0d2340 100%);
}
body.dark-mode .btn-outline {
  background: rgba(255, 255, 255, 0.03);
}
body.dark-mode .footer {
  background: linear-gradient(180deg, #0a0a14 0%, #06060d 100%);
}
body.dark-mode .faq-question .faq-icon { background: #22223a; }
body.dark-mode .card-icon { box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5); }

/* ============================================================
   打印样式
   ============================================================ */
@media print {
  .header,
  .back-to-top,
  .hero-visual,
  .footer-links,
  .theme-toggle,
  .mobile-menu-btn,
  .search-box { display: none !important; }
  body { background: #fff; color: #000; }
  .fade-in { opacity: 1 !important; transform: none !important; }
}