/* 音乐转换工具官网 · QQ音乐黄绿色主题 · 2026 升级版 */
:root {
  --green: #31c27c;
  --green-light: #8bc34a;
  --green-dark: #1fa568;
  --green-soft: #eafaf1;
  --grad: linear-gradient(135deg, #31c27c 0%, #8bc34a 100%);
  --grad-soft: linear-gradient(160deg, #e8fbf0 0%, #f4fbea 55%, #ffffff 100%);
  --bg: #f7faf8;
  --card: #ffffff;
  --text: #1a1b1c;
  --text-2: #6b7280;
  --text-3: #9aa8a0;
  --border: #e6f0ea;
  --radius: 14px;
  --shadow-sm: 0 2px 10px rgba(0,0,0,.04);
  --shadow-md: 0 8px 24px rgba(28,94,66,.08);
  --shadow-lg: 0 14px 36px rgba(49,194,124,.16);
  --shadow-xl: 0 24px 50px rgba(28,94,66,.16);
  --ease: cubic-bezier(.4, 0, .2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 70px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
a { color: var(--green-dark); text-decoration: none; transition: color .2s var(--ease); }
img { max-width: 100%; display: block; }

/* ===== a11y 工具 ===== */
.skip-link {
  position: absolute; top: -40px; left: 0; padding: 8px 16px;
  background: var(--green-dark); color: #fff; z-index: 999;
  transition: top .2s;
}
.skip-link:focus { top: 0; }
:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ===== 顶部导航 ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.88);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .25s var(--ease);
}
.nav.is-scrolled { box-shadow: var(--shadow-sm); }
.nav-inner {
  max-width: 1100px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 18px;
}
.nav-logo {
  display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 17px;
  color: #f59e0b;
}
.nav-logo:hover { color: #fcd34d; }
.nav-logo .logo-dot {
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 100%);
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-size: 16px; box-shadow: 0 4px 12px rgba(245,158,11,.35);
}
.nav-links { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav-links a {
  padding: 6px 12px; border-radius: 8px; color: var(--text); font-size: 14px;
  position: relative;
  transition: background .2s var(--ease), color .2s var(--ease);
}
.nav-links a:hover { background: var(--green-soft); color: var(--green-dark); }
.nav-links a::after {
  content: ""; position: absolute; left: 50%; bottom: 0; width: 0; height: 2px;
  background: var(--grad); transition: width .25s var(--ease), left .25s var(--ease);
}
.nav-links a:hover::after { width: 60%; left: 20%; }
.nav-links a.active { background: var(--green-soft); color: var(--green-dark); font-weight: 700; }
.nav-links a.active::after { width: 70%; left: 15%; }
.nav-drawer a.active { color: var(--green-dark); background: var(--green-soft); font-weight: 700; }
.nav-admin { font-size: 13px; color: var(--text-2); padding: 6px 12px; border-radius: 8px; border: 1px solid var(--border); }
.nav-admin:hover { color: var(--green-dark); border-color: var(--green); background: var(--green-soft); }

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none; border: none; background: none; cursor: pointer;
  width: 36px; height: 36px; padding: 0; margin-left: auto;
  flex-direction: column; gap: 5px; align-items: center; justify-content: center;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--text);
  border-radius: 2px; transition: transform .3s var(--ease), opacity .2s;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-drawer {
  display: none; flex-direction: column; background: #fff;
  border-top: 1px solid var(--border); padding: 12px 20px 18px;
  box-shadow: var(--shadow-md);
  animation: slideDown .25s var(--ease);
}
.nav-drawer a {
  padding: 12px 8px; color: var(--text); font-size: 15px;
  border-bottom: 1px solid var(--border);
}
.nav-drawer a:last-child { border-bottom: none; }
.nav-drawer a:hover { color: var(--green-dark); background: var(--green-soft); }
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== 首屏 Hero ===== */
.hero {
  position: relative; overflow: hidden;
  background: var(--grad-soft);
  padding: 96px 20px 60px; text-align: center;
}

/* 装饰背景 */
.hero-deco {
  position: absolute; inset: 0; pointer-events: none; overflow: hidden;
}
.deco-wave {
  position: absolute; left: 0; right: 0; bottom: 12%;
  width: 100%; height: 200px; opacity: .7;
}
.music-note {
  position: absolute; color: var(--green);
  font-size: 28px; opacity: .25;
  animation: float 6s ease-in-out infinite;
  will-change: transform;
}
.music-note.n1 { top: 18%; left: 8%;  font-size: 32px; animation-delay: 0s; }
.music-note.n2 { top: 32%; right: 12%; font-size: 26px; animation-delay: 1.2s; }
.music-note.n3 { top: 60%; left: 14%; font-size: 22px; animation-delay: 2.4s; opacity: .18; }
.music-note.n4 { top: 22%; right: 24%; font-size: 30px; animation-delay: 0.8s; opacity: .15; }
.music-note.n5 { top: 50%; right: 8%; font-size: 24px; animation-delay: 3.2s; opacity: .22; }

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25% { transform: translateY(-14px) rotate(6deg); }
  50% { transform: translateY(-6px) rotate(-4deg); }
  75% { transform: translateY(-20px) rotate(3deg); }
}

.hero-badge {
  position: absolute; z-index: 1;
  top: 24px; right: 28px;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 999px;
  background: rgba(255,255,255,.85); color: var(--green-dark);
  font-size: 12px; font-weight: 700; letter-spacing: .3px;
  border: 1px solid var(--green);
  box-shadow: 0 4px 14px rgba(49,194,124,.18);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: badgePulse 2.4s ease-in-out infinite;
}
.hero-badge::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--green); box-shadow: 0 0 0 3px rgba(49,194,124,.25);
}
@keyframes badgePulse {
  0%, 100% { box-shadow: 0 6px 20px rgba(49,194,124,.4); }
  50% { box-shadow: 0 6px 24px rgba(49,194,124,.6), 0 0 0 8px rgba(49,194,124,.08); }
}
.hero h1 {
  position: relative; z-index: 1;
  font-size: 96px; margin: 20px 0 10px; letter-spacing: 1px; font-weight: 800;
}
.hero h1 span {
  background: linear-gradient(90deg, #fcd34d 0%, #f59e0b 25%, #fbbf24 50%, #f59e0b 75%, #fcd34d 100%);
  background-size: 200% 100%;
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  animation: textFlow 4s linear infinite;
}
@keyframes textFlow {
  0%   { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}
.hero .subtitle {
  position: relative; z-index: 1;
  color: var(--text-2); font-size: 18px; margin-bottom: 28px;
}
.hero-points {
  position: relative; z-index: 1;
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 32px;
}
.hero-points .pt {
  display: flex; align-items: center; gap: 6px; background: #fff; padding: 8px 16px;
  border-radius: 999px; font-size: 14px; box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.hero-points .pt:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.pt::before { content: "✓"; color: var(--green); font-weight: 700; }

/* 下载按钮：脉冲光圈 + shine */
.hero-cta { position: relative; z-index: 1; }
.btn-download {
  position: relative; overflow: hidden;
  display: inline-block; padding: 16px 52px; border-radius: 999px;
  background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 100%); color: #fff !important; font-size: 18px; font-weight: 700;
  box-shadow: 0 10px 30px rgba(245,158,11,.45);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.btn-download::before {
  content: ""; position: absolute; inset: -3px; border-radius: 999px;
  background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 100%); opacity: .35; filter: blur(10px);
  z-index: -1; animation: ctaGlow 2.2s ease-in-out infinite;
}
.btn-download:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 36px rgba(245,158,11,.55);
}
.btn-download:active { transform: translateY(-1px); }
.btn-shine {
  position: absolute; top: 0; left: -100%; width: 60%; height: 100%;
  background: linear-gradient(120deg, transparent 0%, rgba(255,255,255,.4) 50%, transparent 100%);
  animation: shine 3.5s ease-in-out infinite;
  pointer-events: none;
}
@keyframes shine {
  0% { left: -100%; }
  60%, 100% { left: 120%; }
}
@keyframes ctaGlow {
  0%, 100% { transform: scale(1); opacity: .35; }
  50% { transform: scale(1.06); opacity: .55; }
}

.hero-meta {
  position: relative; z-index: 1;
  margin-top: 22px; color: var(--text-2); font-size: 14px;
}
.hero-meta .sep { margin: 0 10px; color: #cbd5cf; }
.hero-tags {
  position: relative; z-index: 1;
  margin-top: 14px; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap;
}
.hero-tags span {
  padding: 4px 14px; border-radius: 999px; border: 1px solid var(--green);
  color: var(--green-dark); font-size: 13px; background: #fff;
}
.hero-alt {
  position: relative; z-index: 1;
  margin-top: 14px; font-size: 14px;
}

/* Hero 截图：3D 悬浮 + 入场动画 */
.hero-shot {
  position: relative; z-index: 1;
  max-width: 920px; margin: 56px auto 0;
  perspective: 1500px;
  animation: shotFadeIn .8s var(--ease) both;
}
@keyframes shotFadeIn {
  from { opacity: 0; transform: translateY(40px) scale(.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.hero-shot-frame {
  position: relative; border-radius: 20px;
  background: var(--card);
  transition: transform .35s var(--ease);
  transform-style: preserve-3d;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 80%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, #000 80%, transparent 100%);
}
.hero-shot-frame img {
  display: block; width: 100%; border-radius: 20px;
  border: 1px solid rgba(49,194,124,.28);
  box-shadow: var(--shadow-xl);
}
.hero-shot-glow {
  position: absolute; inset: -4% -2% 10%; z-index: -1;
  background: linear-gradient(160deg, rgba(49,194,124,.4), rgba(139,195,74,.28));
  border-radius: 30px; filter: blur(36px);
}

/* ===== 板块容器 ===== */
.section { max-width: 1100px; margin: 0 auto; padding: 64px 20px; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-kicker {
  display: inline-block; font-size: 12px; letter-spacing: 2px;
  color: var(--green); font-weight: 600; margin-bottom: 8px;
  padding: 4px 12px; background: var(--green-soft); border-radius: 999px;
}
.section-head h2 { font-size: 32px; font-weight: 800; }
.section-head h2 em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.section-head p { color: var(--text-2); margin-top: 10px; font-size: 15px; }

/* 滚动入场动画（IntersectionObserver） */
.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal-stagger > * {
  opacity: 0; transform: translateY(20px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
.reveal-stagger.is-visible > * { opacity: 1; transform: translateY(0); }
.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: .05s; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: .12s; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: .19s; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: .26s; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: .33s; }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: .4s; }
.reveal-stagger.is-visible > *:nth-child(7) { transition-delay: .47s; }
.reveal-stagger.is-visible > *:nth-child(8) { transition-delay: .54s; }
.reveal-stagger.is-visible > *:nth-child(9) { transition-delay: .61s; }

/* ===== 功能卡片 ===== */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 20px; }
.feature-card {
  position: relative; overflow: hidden;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.feature-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--grad); transform: scaleX(0); transform-origin: left;
  transition: transform .35s var(--ease);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(49,194,124,.4); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-card .f-icon {
  width: 56px; height: 56px; border-radius: 16px; background: var(--green-soft);
  display: flex; align-items: center; justify-content: center; font-size: 28px;
  margin-bottom: 16px; transition: transform .3s var(--ease), background .25s var(--ease);
}
.feature-card:hover .f-icon { transform: scale(1.08) rotate(-4deg); background: var(--grad); }
.feature-card:hover .f-icon span { filter: grayscale(1) brightness(2); }
.feature-card h3 { font-size: 18px; margin-bottom: 8px; font-weight: 700; }
.feature-card p { color: var(--text-2); font-size: 14px; margin-bottom: 14px; line-height: 1.7; }
.feature-card .f-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.feature-card .f-tags span {
  font-size: 12px; color: var(--green-dark); background: #eefbf3;
  padding: 3px 10px; border-radius: 999px;
}

/* ===== 格式支持 ===== */
.format-box {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}
.format-box h3 { font-size: 19px; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.format-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.format-chips span {
  padding: 7px 14px; border-radius: 8px; font-size: 13px; font-weight: 600;
  background: #f0faf4; color: #2c9a64; border: 1px solid #d9f0e3;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.format-chips span:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.format-chips span.special {
  background: #f0faf4; color: #2c9a64; border: 1px solid #d9f0e3;
}
.format-chips .chip-label {
  background: transparent; border: none; color: var(--text-2); font-weight: 600; font-size: 12px;
  padding: 7px 6px 7px 0; letter-spacing: 1px;
  display: flex; align-items: center; gap: 4px;
}
.format-chips .chip-label::before { content: "▸"; color: var(--green); }
.format-note { margin-top: 8px; font-size: 13px; color: var(--text-2); line-height: 1.7; }

/* ===== 文章卡片（现代博客风格） ===== */
.article-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 24px; }
.article-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  overflow: hidden; cursor: pointer; display: flex; flex-direction: column;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.article-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.article-card .a-cover {
  position: relative; height: 0; padding-top: 58%;
  background: linear-gradient(135deg, #fef9c3 0%, #fde68a 55%, #fcd34d 100%);
  overflow: hidden;
}
.article-card .a-cover img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  transition: transform .4s var(--ease);
}
.article-card:hover .a-cover img { transform: scale(1.06); }
.article-card .a-cover-ph {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  color: #b45309; font-size: 64px; opacity: .35;
}
/* 有真实封面图时：图片覆盖黄底，移除底部黑色遮罩 */
.article-card .a-cover:has(img) { background: var(--grad); }
.article-card .a-cover:has(img)::after { display: none; }
/* 占位状态：不加黑色 overlay，保留纯净淡黄 */
.article-card .a-cover:has(.a-cover-ph)::after { display: none; }
/* 空封面占位：保留暖色纯净感 */
.a-cover::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,.25), transparent 50%);
  z-index: 1;
}
.article-card .a-body { padding: 20px 22px 18px; display: flex; flex-direction: column; flex: 1; }
.article-card .a-cat {
  align-self: flex-start; font-size: 12px; color: var(--green-dark); background: #eefbf3;
  padding: 3px 10px; border-radius: 999px; border: 1px solid #d9f0e3;
  font-weight: 600;
}
.article-card h3 {
  font-size: 17px; margin: 10px 0 6px; line-height: 1.5; font-weight: 700;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.article-card p {
  color: var(--text-2); font-size: 14px; line-height: 1.65; flex: 1;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.article-card .a-foot {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 14px; padding-top: 12px; border-top: 1px dashed #e6f0ea;
}
.article-card .a-date { font-size: 12px; color: var(--text-3); }
.article-card .a-more {
  font-size: 13px; color: var(--green-dark); font-weight: 600;
  display: inline-flex; align-items: center; gap: 4px;
  transition: gap .2s var(--ease);
}
.article-card:hover .a-more { gap: 8px; }

/* ===== 文章筛选工具栏（chips + 搜索）===== */
.article-toolbar {
  max-width: 1100px; margin: 0 auto 28px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
}
.article-chips {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.article-chip {
  cursor: pointer; user-select: none;
  padding: 6px 14px; border-radius: 999px;
  font-size: 13px; font-weight: 600;
  background: #fff; color: var(--text-2);
  border: 1px solid var(--border);
  transition: background .2s, color .2s, border-color .2s, transform .15s;
}
.article-chip:hover { border-color: var(--green); color: var(--green-dark); transform: translateY(-1px); }
.article-chip.is-active {
  background: var(--green); color: #fff; border-color: var(--green);
  box-shadow: 0 4px 12px rgba(49,194,124,.25);
}
.article-chip .chip-count {
  margin-left: 6px; opacity: .7; font-weight: 500;
}
.article-search {
  display: flex; align-items: center; gap: 10px;
}
.article-search input {
  width: 220px; max-width: 100%;
  padding: 8px 14px; border-radius: 999px;
  border: 1px solid var(--border); background: #fff;
  font-size: 13px; color: var(--text-1);
  transition: border-color .2s, box-shadow .2s;
}
.article-search input:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(49,194,124,.18);
}
.article-search input::-webkit-search-cancel-button { cursor: pointer; }
.article-count {
  font-size: 12px; color: var(--text-3); white-space: nowrap;
}
.article-empty {
  grid-column: 1 / -1; text-align: center; padding: 60px 20px;
  color: var(--text-3); font-size: 14px;
}
@media (max-width: 720px) {
  .article-toolbar { flex-direction: column; align-items: stretch; }
  .article-search { justify-content: space-between; }
  .article-search input { flex: 1; width: auto; }
}

/* ===== 文章详情弹窗 ===== */
.modal-mask {
  position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 200;
  display: flex; align-items: flex-start; justify-content: center;
  padding: 40px 16px; overflow-y: auto;
  animation: fadeIn .25s var(--ease);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal-box {
  background: #fff; border-radius: 16px; max-width: 760px; width: 100%;
  padding: 32px 36px; position: relative;
  box-shadow: 0 30px 80px rgba(0,0,0,.3);
  animation: modalUp .35s var(--ease);
}
@keyframes modalUp {
  from { opacity: 0; transform: translateY(20px) scale(.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-box h2 { font-size: 26px; margin-bottom: 10px; font-weight: 800; }
.modal-box .m-meta { color: var(--text-2); font-size: 13px; margin-bottom: 20px; }
.modal-box .m-close {
  position: absolute; top: 16px; right: 18px; border: none; background: #f2f5f3;
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer; font-size: 18px; color: #555;
  display: flex; align-items: center; justify-content: center;
  transition: background .2s var(--ease), transform .2s var(--ease);
}
.modal-box .m-close:hover { background: var(--green-soft); color: var(--green-dark); transform: rotate(90deg); }
.modal-box .m-content { font-size: 15px; line-height: 1.85; word-break: break-word; }
.modal-box .m-content img { border-radius: 10px; margin: 10px 0; }
.modal-box .m-content h1, .modal-box .m-content h2, .modal-box .m-content h3 { margin: 20px 0 10px; font-weight: 700; }
.modal-box .m-content p { margin: 10px 0; }
.modal-box .m-content ul, .modal-box .m-content ol { padding-left: 22px; margin: 10px 0; }
.modal-box .m-content blockquote {
  border-left: 3px solid var(--green); padding: 4px 0 4px 14px;
  color: var(--text-2); margin: 12px 0; background: var(--green-soft); border-radius: 0 8px 8px 0;
}
.modal-box .m-content code {
  background: #f0faf4; color: #2c9a64; padding: 1px 6px; border-radius: 4px; font-size: 13px;
}
.modal-box .m-content pre {
  background: #1a1b1c; color: #e6f0ea; padding: 14px; border-radius: 10px; overflow-x: auto;
}
.modal-box .m-content pre code { background: transparent; color: inherit; padding: 0; }
.modal-box .m-content a { text-decoration: underline; }
.modal-box .m-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--border);
}
.modal-box .m-nav-cell {
  display: flex; flex-direction: column; gap: 4px; padding: 12px 16px;
  background: var(--green-soft); border-radius: 10px;
  border: 1px solid var(--border);
  transition: background .2s var(--ease), transform .2s var(--ease), border-color .2s var(--ease);
  min-width: 0;
}
.modal-box .m-nav-cell:not(.m-nav-empty):hover { background: #fff; transform: translateY(-2px); border-color: var(--green); }
.modal-box .m-nav-next { text-align: right; align-items: flex-end; }
.modal-box .m-nav-side { font-size: 12px; color: var(--green-dark); font-weight: 600; letter-spacing: .5px; }
.modal-box .m-nav-title {
  font-size: 14px; color: var(--text); font-weight: 500;
  display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
  max-width: 100%;
}
.modal-box .m-nav-empty { opacity: .5; cursor: default; }
.modal-box .m-nav-empty .m-nav-title { color: var(--text-3); font-weight: 400; }
.modal-box .m-hint {
  text-align: center; margin-top: 14px; font-size: 12px; color: var(--text-3);
  letter-spacing: .5px;
}
@media (max-width: 640px) {
  .modal-box .m-nav { grid-template-columns: 1fr; }
  .modal-box .m-nav-next { text-align: left; align-items: flex-start; }
}

/* ===== AI 动态（时间线风格） ===== */
.ai-news {
  position: relative;
  background: linear-gradient(160deg, #e8fbf0, #f6fcec);
  border: 1px solid #d9f0e3; border-radius: var(--radius);
  padding: 28px 30px;
  box-shadow: var(--shadow-sm);
}
.ai-news .an-header {
  display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap;
}
.ai-news .an-date {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; color: var(--green-dark); font-weight: 700;
}
.ai-news .an-date::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--green);
  box-shadow: 0 0 0 4px rgba(49,194,124,.2);
  animation: dotPulse 1.8s ease-in-out infinite;
}
@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(49,194,124,.2); }
  50% { box-shadow: 0 0 0 8px rgba(49,194,124,.05); }
}
.ai-news .an-tag {
  font-size: 11px; padding: 2px 8px; border-radius: 999px;
  background: var(--grad); color: #fff; font-weight: 600;
}
.ai-news .an-overview {
  font-size: 15px; margin: 12px 0 18px; line-height: 1.85; color: #2a3530;
  background: #fff; border-radius: 10px; padding: 14px 16px;
  border-left: 3px solid var(--green);
}
.ai-news ul { list-style: none; position: relative; padding-left: 8px; }
.ai-news ul::before {
  content: ""; position: absolute; left: 3px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(to bottom, var(--green), var(--green-light));
  opacity: .35;
}
.ai-news li {
  position: relative;
  padding: 12px 0 12px 22px; border-top: 1px dashed #cde8d8; display: flex; gap: 10px; align-items: baseline;
}
.ai-news li::before {
  content: ""; position: absolute; left: -2px; top: 18px;
  width: 10px; height: 10px; border-radius: 50%; background: #fff;
  border: 2px solid var(--green);
}
.ai-news li:first-child { border-top: none; }
.ai-news li .an-src {
  flex-shrink: 0; font-size: 12px; color: var(--green-dark); background: #fff;
  padding: 1px 8px; border-radius: 6px; border: 1px solid #d9f0e3;
  font-weight: 600;
}
.ai-news li a {
  font-size: 14px; color: var(--text);
  transition: color .2s var(--ease);
}
.ai-news li a:hover { color: var(--green-dark); text-decoration: underline; }

/* ===== FAQ ===== */
.faq-item {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  margin-bottom: 12px; overflow: hidden;
  transition: box-shadow .2s var(--ease), border-color .2s var(--ease);
}
.faq-item:hover { box-shadow: var(--shadow-sm); }
.faq-item.open { border-color: rgba(49,194,124,.4); box-shadow: var(--shadow-sm); }
.faq-q {
  padding: 16px 20px; cursor: pointer; font-weight: 600; font-size: 15px;
  display: flex; justify-content: space-between; align-items: center; user-select: none;
  gap: 12px;
}
.faq-q::after {
  content: "+"; color: var(--green); font-size: 22px; font-weight: 400;
  transition: transform .25s var(--ease); flex-shrink: 0;
}
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  padding: 0 20px;
  color: var(--text-2); font-size: 14px; line-height: 1.8;
  transition: max-height .35s var(--ease), padding .35s var(--ease);
}
.faq-item.open .faq-a { max-height: 400px; padding: 0 20px 16px; }

/* ===== 联系方式 ===== */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.contact-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 20px; text-align: center;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
  cursor: pointer;
}
.contact-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.contact-card .c-icon { font-size: 32px; margin-bottom: 10px; }
.contact-card .c-label { font-size: 12px; color: var(--text-2); letter-spacing: 1px; }
.contact-card .c-value {
  font-size: 16px; font-weight: 600; margin-top: 6px; word-break: break-all;
  position: relative;
}
.contact-card .c-value.is-masked { letter-spacing: 1px; color: var(--text-2); }
.contact-card .c-value.is-revealed { color: var(--green-dark); }
.contact-card .c-hint {
  font-size: 11px; color: var(--text-3); margin-top: 4px;
}
.contact-note { text-align: center; color: var(--text-2); margin-top: 20px; font-size: 14px; }

/* ===== 自定义板块富文本 ===== */
.custom-block {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 36px; line-height: 1.85; font-size: 15px;
  box-shadow: var(--shadow-sm);
}
.custom-block h1, .custom-block h2, .custom-block h3 { margin: 16px 0 10px; font-weight: 700; }
.custom-block p { margin: 10px 0; }
.custom-block ul, .custom-block ol { padding-left: 22px; }
.custom-block img { border-radius: 10px; margin: 8px 0; }
.custom-block blockquote {
  border-left: 3px solid var(--green); padding-left: 14px; color: var(--text-2); margin: 12px 0;
  background: var(--green-soft); border-radius: 0 8px 8px 0;
}
.custom-block a { text-decoration: underline; }

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--border); padding: 30px 20px 26px; text-align: center;
  color: var(--text-2); font-size: 13px; background: #fff;
}
.footer .foot-links { margin-bottom: 12px; display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.footer .foot-links a { color: var(--text-2); }
.footer .foot-links a:hover { color: var(--green-dark); }
.foot-meta { color: var(--text-3); font-size: 12px; margin-top: 6px; }
.foot-disclaimer { margin-top: 10px; line-height: 1.6; }
.foot-disc-main { font-size: 13px; color: var(--text); font-weight: 500; }
.foot-disc-sub { font-size: 12px; color: var(--text-3); margin-top: 2px; }

/* ===== 回到顶部 ===== */
.to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--grad); color: #fff; font-size: 22px; font-weight: 700;
  border: none; cursor: pointer; box-shadow: 0 8px 24px rgba(49,194,124,.4);
  opacity: 0; transform: translateY(20px); pointer-events: none;
  transition: opacity .3s var(--ease), transform .3s var(--ease), background .2s;
}
.to-top.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.to-top:hover { transform: translateY(-3px); }

/* ===== 骨架屏 ===== */
.skeleton {
  background: linear-gradient(90deg, #eafaf1 25%, #f4fbea 50%, #eafaf1 75%);
  background-size: 200% 100%;
  animation: skShimmer 1.4s linear infinite;
  border-radius: 8px;
}
@keyframes skShimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.sk-badge { width: 110px; height: 28px; margin: 0 auto 18px; border-radius: 999px; }
.sk-title { width: 60%; max-width: 360px; height: 44px; margin: 0 auto 12px; }
.sk-sub { width: 40%; max-width: 240px; height: 18px; margin: 0 auto 24px; }
.sk-btn { width: 200px; height: 50px; margin: 0 auto; border-radius: 999px; }

/* ===== 空态与通用 ===== */
.empty { text-align: center; color: var(--text-2); padding: 30px 0; }
.hidden { display: none !important; }
.section-hidden { display: none !important; }
.loading { text-align: center; padding: 40px; color: var(--text-2); }

::selection { background: var(--green); color: #fff; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: #f4fbea; }
::-webkit-scrollbar-thumb { background: rgba(49,194,124,.4); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--green); }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav-inner { padding: 10px 16px; }
  .nav-links, .nav-admin { display: none; }
  .nav-toggle { display: flex; }
  .nav.is-mobile-open .nav-drawer { display: flex; }
  .hero { padding: 72px 16px 40px; }
  .hero h1 { font-size: 32px; }
  .hero .subtitle { font-size: 15px; }
  .hero-points .pt { font-size: 13px; padding: 6px 12px; }
  .btn-download { padding: 14px 38px; font-size: 16px; }
  .section { padding: 48px 16px; }
  .section-head h2 { font-size: 26px; }
  .modal-box { padding: 24px 20px; }
  .modal-box h2 { font-size: 22px; }
  .feature-grid { gap: 14px; }
  .article-grid { gap: 16px; }
  .contact-grid { gap: 12px; }
  .hero-shot { margin-top: 36px; }
  .music-note.n3, .music-note.n4, .music-note.n5 { display: none; }
  .to-top { right: 16px; bottom: 16px; width: 40px; height: 40px; }
  .hero-badge { top: 14px; right: 14px; font-size: 11px; padding: 4px 10px; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 28px; }
  .hero-meta .sep { display: block; margin: 4px 0; }
  .hero-meta .sep:last-of-type { display: none; }
  .nav-logo span:last-child { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important; transition-duration: .01ms !important;
  }
}