/* ============================================================
   ao3ao.cn - AO3同人档案馆入口站
   主题：米色 + 深酒红 + 琥珀金 (区别于 ao3a.cn 的纯白+正红)
   布局：左右分屏Hero、纸质档案卡片、时间线步骤
   字体：Georgia衬线增加书卷气
   ============================================================ */

/* ====== 变量定义 ====== */
:root{
  /* 配色 - 暖色档案风 */
  --c-bg:#faf7f2;          /* 米色背景 */
  --c-bg-2:#f3ede3;        /* 略深米色 */
  --c-card:#ffffff;
  --c-paper:#fefbf6;       /* 纸张色 */
  --c-border:rgba(122,31,31,0.12);
  --c-border-2:rgba(122,31,31,0.22);
  --c-text:#1f1a17;        /* 深棕黑 */
  --c-text-m:#5c4a3f;      /* 中棕 */
  --c-text-s:#8a7563;      /* 浅棕 */

  --c-red:#7a1f1f;         /* 深酒红 */
  --c-red-d:#5a1414;
  --c-red-l:#a93434;
  --c-amber:#b45309;       /* 琥珀金 */
  --c-amber-l:#d97706;
  --c-gold:#92400e;
  --c-cream:#fef3c7;
  --c-cyan:#0e7490;
  --c-green:#15803d;

  --grad-red:linear-gradient(135deg,#7a1f1f 0%,#a93434 100%);
  --grad-warm:linear-gradient(135deg,#7a1f1f 0%,#b45309 50%,#92400e 100%);
  --grad-paper:linear-gradient(180deg,#fefbf6 0%,#faf7f2 100%);
  --grad-text:linear-gradient(135deg,#7a1f1f 0%,#b45309 60%,#92400e 100%);

  --shadow-sm:0 1px 3px rgba(122,31,31,0.06);
  --shadow:0 4px 18px rgba(122,31,31,0.08);
  --shadow-lg:0 18px 50px rgba(122,31,31,0.14);
  --shadow-paper:0 8px 30px rgba(180,83,9,0.10);

  --radius-sm:8px;
  --radius:12px;
  --radius-lg:18px;
  --radius-xl:24px;

  --nav-h:68px;
  --topbar-h:40px;
  --float-h:72px;

  --font-serif:Georgia,"Times New Roman","Songti SC","Noto Serif SC",serif;
  --font-sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;
}

/* ====== 基础重置 ====== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + var(--topbar-h) + 20px);-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-sans);
  background:var(--c-bg);
  color:var(--c-text);
  line-height:1.65;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
  padding-top:calc(var(--topbar-h) + env(safe-area-inset-top,0));
  padding-bottom:calc(var(--float-h) + env(safe-area-inset-bottom,0));
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--c-red);text-decoration:none;transition:color .2s}
a:hover{color:var(--c-red-d)}
button{font-family:inherit;cursor:pointer;border:0;background:none}
ul{list-style:none}

.skip-link{position:absolute;left:-9999px;top:0;width:1px;height:1px;overflow:hidden}
.skip-link:focus{position:fixed;left:8px;top:8px;width:auto;height:auto;padding:8px 16px;background:var(--c-red);color:#fff;border-radius:8px;z-index:1000}

/* ====== 容器 ====== */
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ====== 顶部公告条 ====== */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:60;
  height:var(--topbar-h);
  background:linear-gradient(90deg,var(--c-red-d),var(--c-red));
  color:#fff;
  display:flex;align-items:center;
  padding-top:env(safe-area-inset-top,0);
  font-size:13px;
}
.topbar-inner{
  max-width:1200px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;gap:12px;width:100%;
}
.topbar-tag{
  background:rgba(255,255,255,0.18);
  padding:2px 10px;border-radius:999px;
  font-size:11px;letter-spacing:1px;font-weight:600;
}
.topbar-text{opacity:0.95;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ====== 主导航 ====== */
.header{
  position:fixed;top:var(--topbar-h);left:0;right:0;z-index:55;
  background:rgba(250,247,242,0.92);
  backdrop-filter:saturate(180%) blur(16px);
  -webkit-backdrop-filter:saturate(180%) blur(16px);
  border-bottom:1px solid var(--c-border);
  padding-top:env(safe-area-inset-top,0);
}
.nav{
  max-width:1200px;margin:0 auto;
  height:var(--nav-h);
  display:flex;align-items:center;gap:32px;
  padding:0 calc(24px + env(safe-area-inset-right,0)) 0 calc(24px + env(safe-area-inset-left,0));
}
.brand{display:flex;align-items:center;gap:12px;color:var(--c-text)}
.brand:hover{color:var(--c-red)}
.brand-mark{
  width:44px;height:44px;border-radius:12px;
  background:var(--grad-red);
  color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-serif);font-size:22px;font-weight:900;
  position:relative;letter-spacing:-1px;
  box-shadow:0 4px 14px rgba(122,31,31,0.3);
}
.brand-mark sup{font-size:11px;vertical-align:super;margin-left:-2px}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text strong{font-size:17px;font-weight:800;letter-spacing:0.5px;font-family:var(--font-serif)}
.brand-text small{font-size:11px;color:var(--c-text-s);letter-spacing:0.5px}

.nav-list{display:none;gap:4px;flex:1}
.nav-list a{
  padding:8px 14px;border-radius:8px;
  font-size:14.5px;font-weight:500;color:var(--c-text-m);
  position:relative;
}
.nav-list a:hover{background:rgba(122,31,31,0.06);color:var(--c-red)}
@media(min-width:1024px){.nav-list{display:flex}}

.btn-download{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;border-radius:10px;
  background:var(--grad-red);color:#fff !important;
  font-size:14px;font-weight:600;
  box-shadow:0 4px 14px rgba(122,31,31,0.28);
  transition:transform .2s,box-shadow .2s;
}
.btn-download:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(122,31,31,0.36)}
.btn-download svg{width:18px;height:18px}

.menu-btn{
  display:inline-flex;align-items:center;justify-content:center;
  width:42px;height:42px;border-radius:10px;
  color:var(--c-text);font-size:20px;
  background:rgba(122,31,31,0.06);
}
.menu-btn:hover{background:rgba(122,31,31,0.12)}
@media(min-width:1024px){.menu-btn{display:none}}

/* ====== 移动端抽屉 ====== */
.drawer{display:none}
@media(max-width:1023px){
  .drawer.open{
    display:block;position:fixed;
    top:calc(var(--topbar-h) + var(--nav-h));
    left:0;right:0;z-index:54;
    background:var(--c-card);
    border-bottom:1px solid var(--c-border);
    box-shadow:var(--shadow-lg);
    padding:14px 20px 20px;
  }
  .drawer a{
    display:block;padding:14px 16px;
    border-radius:10px;font-size:15px;font-weight:600;
    color:var(--c-text);border-bottom:1px solid var(--c-border);
    min-height:48px;display:flex;align-items:center;
  }
  .drawer a:hover{background:rgba(122,31,31,0.06);color:var(--c-red)}
  .drawer .drawer-dl{
    background:var(--grad-red);color:#fff !important;
    justify-content:center;border-bottom:0;margin-top:8px;
    box-shadow:0 4px 14px rgba(122,31,31,0.28);
  }
}

/* ====== Section 通用 ====== */
.section{padding:88px 0;position:relative}
@media(min-width:768px){.section{padding:100px 0}}
.section-head{margin-bottom:48px;max-width:680px}
.section-head.head-center{margin-left:auto;margin-right:auto;text-align:center}
.section-head.head-left{margin-left:0}
.eyebrow{
  display:inline-block;
  font-family:var(--font-serif);
  font-size:12px;letter-spacing:2px;font-weight:600;
  color:var(--c-amber);text-transform:uppercase;
  padding:5px 12px;background:rgba(180,83,9,0.08);
  border-radius:6px;margin-bottom:14px;
}
.section-title{
  font-family:var(--font-serif);
  font-size:32px;font-weight:800;letter-spacing:-0.5px;
  color:var(--c-text);line-height:1.2;margin-bottom:14px;
}
@media(min-width:768px){.section-title{font-size:40px}}
.section-desc{font-size:15px;color:var(--c-text-m);line-height:1.8}
@media(min-width:768px){.section-desc{font-size:16px}}

/* ====== Hero 区：左右分屏 ====== */
.hero{
  padding:48px 0 64px;
  background:
    radial-gradient(ellipse at top right,rgba(180,83,9,0.06),transparent 60%),
    radial-gradient(ellipse at bottom left,rgba(122,31,31,0.04),transparent 60%),
    var(--c-bg);
  position:relative;overflow:hidden;
}
@media(min-width:768px){.hero{padding:72px 0 88px}}
@media(min-width:1024px){.hero{padding:88px 0 110px}}

.hero-grid{
  max-width:1200px;margin:0 auto;padding:0 24px;
  display:grid;gap:48px;align-items:center;
  grid-template-columns:1fr;
}
@media(min-width:900px){
  .hero-grid{grid-template-columns:1.1fr 0.9fr;gap:64px}
}

.hero-badge{
  display:inline-flex;align-items:center;gap:10px;
  padding:8px 16px;border-radius:999px;
  background:linear-gradient(90deg,rgba(122,31,31,0.08),rgba(180,83,9,0.08));
  color:var(--c-red);font-size:13px;font-weight:600;
  margin-bottom:24px;border:1px solid rgba(122,31,31,0.14);
  font-family:var(--font-serif);
}
.badge-dot{
  width:8px;height:8px;border-radius:50%;
  background:var(--c-amber-l);
  box-shadow:0 0 0 4px rgba(217,119,6,0.2);
  animation:pulse 2s ease-in-out infinite;
}
@keyframes pulse{50%{box-shadow:0 0 0 8px rgba(217,119,6,0)}}

.hero-title{
  font-family:var(--font-serif);
  margin-bottom:24px;line-height:1.1;
}
.title-mark{
  display:block;
  font-size:24px;font-weight:700;font-style:italic;
  color:var(--c-amber);letter-spacing:0.5px;
  margin-bottom:8px;
}
@media(min-width:768px){.title-mark{font-size:30px}}
.title-cn{
  display:block;
  font-size:42px;font-weight:900;
  background:var(--grad-text);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  letter-spacing:-1px;line-height:1.1;
}
@media(min-width:768px){.title-cn{font-size:58px}}
@media(min-width:1024px){.title-cn{font-size:66px}}

.hero-desc{
  font-size:15px;color:var(--c-text-m);line-height:1.9;
  margin-bottom:32px;max-width:560px;
}
@media(min-width:768px){.hero-desc{font-size:16px}}
.hero-desc strong{color:var(--c-red);font-weight:700}
.hero-desc b{color:var(--c-amber);font-weight:600}

.hero-actions{
  display:flex;gap:14px;flex-wrap:wrap;margin-bottom:36px;
}
.btn-primary{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 22px;border-radius:14px;
  background:var(--grad-red);color:#fff !important;
  font-size:15px;font-weight:600;
  box-shadow:0 8px 24px rgba(122,31,31,0.30);
  transition:transform .2s,box-shadow .2s;
  min-height:54px;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(122,31,31,0.38)}
.btn-primary.big{padding:16px 26px;min-height:60px}
.btn-icon{
  width:30px;height:30px;border-radius:50%;
  background:rgba(255,255,255,0.2);
  display:inline-flex;align-items:center;justify-content:center;
  font-size:16px;font-weight:700;
}
.btn-text{display:flex;flex-direction:column;line-height:1.2}
.btn-text strong{font-size:15px;font-weight:700}
.btn-text small{font-size:11.5px;opacity:0.85;margin-top:2px}

.btn-ghost{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 22px;border-radius:14px;
  background:var(--c-card);color:var(--c-text) !important;
  font-size:15px;font-weight:600;
  border:1.5px solid var(--c-border-2);
  min-height:54px;
  transition:border-color .2s,transform .2s;
}
.btn-ghost:hover{border-color:var(--c-red);transform:translateY(-2px)}

.hero-meta{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:12px;max-width:560px;
}
.meta-item{
  background:var(--c-card);
  border:1px solid var(--c-border);
  border-radius:10px;padding:12px 8px;text-align:center;
}
.meta-item b{
  display:block;font-family:var(--font-serif);
  font-size:22px;font-weight:900;color:var(--c-red);line-height:1.1;
}
.meta-item span{font-size:11px;color:var(--c-text-s);margin-top:4px;display:block}

/* ====== Hero 右侧手机mockup ====== */
.hero-right{position:relative;display:flex;justify-content:center;align-items:center}
.phone-mockup{
  width:280px;max-width:100%;
  aspect-ratio:9/18;
  background:linear-gradient(160deg,#1a1410,#2a1f1a);
  border-radius:36px;
  padding:12px;
  box-shadow:
    0 30px 80px rgba(122,31,31,0.22),
    0 10px 30px rgba(180,83,9,0.14),
    inset 0 1px 0 rgba(255,255,255,0.08);
  position:relative;
}
.phone-notch{
  position:absolute;top:14px;left:50%;transform:translateX(-50%);
  width:80px;height:18px;background:#0a0706;border-radius:0 0 12px 12px;
  z-index:2;
}
.phone-screen{
  width:100%;height:100%;
  background:var(--c-paper);
  border-radius:26px;overflow:hidden;
  display:flex;flex-direction:column;
  position:relative;
}
.screen-header{
  padding:32px 14px 10px;
  display:flex;align-items:center;gap:8px;
  background:var(--grad-red);color:#fff;
}
.screen-logo{
  font-family:var(--font-serif);font-weight:900;font-size:16px;
  background:rgba(255,255,255,0.2);padding:2px 8px;border-radius:6px;
}
.screen-title{font-size:13px;font-weight:700;flex:1;font-family:var(--font-serif)}
.screen-menu{font-size:18px;opacity:0.8}
.screen-search{
  margin:10px 12px 8px;padding:7px 10px;
  background:rgba(122,31,31,0.06);border-radius:8px;
  display:flex;align-items:center;gap:6px;font-size:11px;color:var(--c-text-s);
}
.search-ico{font-size:12px}
.screen-tags{
  display:flex;gap:5px;padding:0 12px 10px;flex-wrap:wrap;
}
.screen-tags span{
  font-size:10px;padding:3px 8px;
  background:rgba(180,83,9,0.12);color:var(--c-amber);
  border-radius:6px;font-weight:600;
}
.screen-list{flex:1;padding:0 12px;overflow:hidden;display:flex;flex-direction:column;gap:8px}
.list-item{
  display:flex;gap:8px;padding:8px;
  background:var(--c-bg-2);border-radius:8px;
}
.list-cover{
  width:36px;height:48px;border-radius:6px;flex-shrink:0;
}
.cover-1{background:linear-gradient(135deg,#7a1f1f,#b45309)}
.cover-2{background:linear-gradient(135deg,#0e7490,#15803d)}
.cover-3{background:linear-gradient(135deg,#92400e,#d97706)}
.list-meta{flex:1;display:flex;flex-direction:column;justify-content:center;gap:1px;min-width:0}
.list-meta strong{font-size:11px;font-weight:700;color:var(--c-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.list-meta small{font-size:9px;color:var(--c-text-s)}
.list-meta em{font-size:9px;color:var(--c-amber);font-style:normal;font-weight:600}
.screen-tabbar{
  display:flex;justify-content:space-around;
  padding:8px 12px 14px;border-top:1px solid var(--c-border);
  background:var(--c-card);
}
.screen-tabbar .tab{font-size:9px;color:var(--c-text-s);text-align:center;font-weight:500}
.screen-tabbar .tab.active{color:var(--c-red);font-weight:700}

.phone-float{
  position:absolute;
  background:var(--c-card);
  border:1.5px solid var(--c-border-2);
  border-radius:14px;padding:8px 12px;
  box-shadow:var(--shadow-lg);
  display:flex;align-items:center;gap:6px;
  font-size:12px;font-weight:700;
  animation:float 4s ease-in-out infinite;
}
.phone-float b{color:var(--c-red);font-family:var(--font-serif)}
.phone-float small{font-size:9px;color:var(--c-text-s);font-weight:500}
.phone-float.float-1{top:8%;left:-8%;animation-delay:0s}
.phone-float.float-2{bottom:14%;right:-8%;animation-delay:1.5s}
@keyframes float{50%{transform:translateY(-10px)}}

/* ====== 官网入口 entrance ====== */
.entrance{background:var(--c-bg-2)}
.entrance-grid{
  display:grid;grid-template-columns:1fr;gap:18px;
}
@media(min-width:640px){.entrance-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.entrance-grid{grid-template-columns:repeat(4,1fr);gap:20px}}

.entrance-card{
  position:relative;background:var(--c-paper);
  border:1.5px solid var(--c-border);border-radius:var(--radius-lg);
  padding:28px 22px 24px;
  transition:transform .25s,box-shadow .25s,border-color .25s;
  display:flex;flex-direction:column;gap:14px;
  overflow:hidden;
}
.entrance-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:var(--grad-warm);
}
.entrance-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-paper);
  border-color:var(--c-red);
}
.entrance-card.primary{
  background:linear-gradient(135deg,rgba(122,31,31,0.04),rgba(180,83,9,0.04));
  border-color:var(--c-red);
}
.entrance-num{
  font-family:var(--font-serif);font-size:13px;font-weight:700;
  color:var(--c-amber);letter-spacing:2px;
}
.entrance-body h3{
  font-family:var(--font-serif);font-size:19px;font-weight:700;
  color:var(--c-text);margin-bottom:8px;
}
.entrance-body p{font-size:13.5px;color:var(--c-text-m);line-height:1.7}
.entrance-link{
  display:inline-block;font-size:13px;font-weight:600;
  color:var(--c-red);margin-top:4px;
}
.entrance-card:hover .entrance-link{color:var(--c-amber)}
.entrance-badge{
  position:absolute;top:14px;right:14px;
  background:var(--c-red);color:#fff;
  font-size:10px;padding:3px 8px;border-radius:6px;
  font-weight:600;letter-spacing:1px;
}

/* ====== APP 下载展示 ====== */
.app-section{background:var(--c-bg)}
.app-grid{
  display:grid;gap:48px;align-items:center;
  grid-template-columns:1fr;
}
@media(min-width:900px){.app-grid{grid-template-columns:0.85fr 1.15fr;gap:64px}}

.app-showcase{display:flex;justify-content:center}
.showcase-phone{
  width:260px;position:relative;
}
.phone-mini{
  width:100%;aspect-ratio:9/17;
  background:linear-gradient(160deg,#2a1f1a,#1a1410);
  border-radius:32px;padding:10px;
  box-shadow:var(--shadow-lg);
}
.mini-screen{
  width:100%;height:100%;background:var(--c-paper);
  border-radius:24px;overflow:hidden;
  display:flex;flex-direction:column;
}
.mini-banner{
  padding:8px 12px;background:var(--grad-red);color:#fff;
  font-size:11px;font-weight:600;text-align:center;
}
.mini-content{flex:1;padding:14px;font-size:11px;line-height:1.7;color:var(--c-text)}
.mini-content h4{font-family:var(--font-serif);font-size:14px;color:var(--c-red);margin-bottom:8px}
.mini-content p{margin-bottom:6px;color:var(--c-text-m)}
.mini-toolbar{
  display:flex;justify-content:space-around;
  padding:6px 8px;border-top:1px solid var(--c-border);
  font-size:14px;color:var(--c-text-s);
}
.mini-toolbar .active{color:var(--c-red);font-weight:700}

.app-info{display:flex;flex-direction:column;gap:18px}
.info-row{
  display:flex;gap:14px;align-items:flex-start;
  padding:18px 20px;background:var(--c-card);
  border:1px solid var(--c-border);border-radius:var(--radius);
  transition:border-color .2s,box-shadow .2s;
}
.info-row:hover{border-color:var(--c-red);box-shadow:var(--shadow)}
.info-icon{
  width:42px;height:42px;flex-shrink:0;
  border-radius:12px;background:var(--grad-warm);
  display:flex;align-items:center;justify-content:center;
  font-size:20px;
}
.info-row h4{font-family:var(--font-serif);font-size:17px;color:var(--c-text);margin-bottom:4px}
.info-row p{font-size:13.5px;color:var(--c-text-m);line-height:1.7}

.app-download{margin-top:14px;padding-top:18px;border-top:1px dashed var(--c-border-2)}
.download-badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.badge-os{
  font-size:12px;color:var(--c-text-m);
  padding:5px 10px;background:var(--c-bg-2);
  border-radius:6px;font-weight:500;
}

/* ====== 功能矩阵 features ====== */
.features{background:var(--c-bg-2)}
.feature-grid{
  display:grid;gap:18px;grid-template-columns:1fr;
}
@media(min-width:640px){.feature-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.feature-grid{grid-template-columns:repeat(3,1fr);gap:20px}}

.feature-card{
  background:var(--c-paper);
  border:1.5px solid var(--c-border);border-radius:var(--radius-lg);
  padding:28px 24px;
  position:relative;overflow:hidden;
  transition:transform .25s,box-shadow .25s;
}
.feature-card::after{
  content:"";position:absolute;top:0;left:0;
  width:0;height:3px;background:var(--grad-warm);
  transition:width .3s;
}
.feature-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-paper)}
.feature-card:hover::after{width:100%}
.feature-num{
  font-family:var(--font-serif);font-size:13px;font-weight:700;
  color:var(--c-amber);letter-spacing:2px;margin-bottom:14px;
}
.feature-card h3{
  font-family:var(--font-serif);font-size:20px;font-weight:700;
  color:var(--c-text);margin-bottom:10px;line-height:1.3;
}
.feature-card p{font-size:14px;color:var(--c-text-m);line-height:1.75;margin-bottom:14px}
.feature-tags{display:flex;gap:6px;flex-wrap:wrap}
.feature-tags span{
  font-size:11px;padding:3px 8px;
  background:rgba(122,31,31,0.06);color:var(--c-red);
  border-radius:6px;font-weight:500;
}

/* ====== 标签云 ====== */
.tagcloud{background:var(--c-bg)}
.tags-box{
  background:var(--c-paper);
  border:1.5px solid var(--c-border);
  border-radius:var(--radius-lg);
  padding:36px 28px;
  display:flex;flex-wrap:wrap;gap:9px;align-items:center;
  box-shadow:var(--shadow-sm);
}
@media(min-width:768px){.tags-box{padding:48px 40px}}
.tag{
  display:inline-flex;align-items:center;
  padding:8px 14px;border-radius:8px;
  background:var(--c-bg-2);color:var(--c-text-m);
  font-size:13px;font-weight:500;
  border:1px solid transparent;
  transition:all .2s;min-height:36px;
  text-decoration:none;
}
.tag:hover{
  background:var(--c-red);color:#fff;
  border-color:var(--c-red);transform:translateY(-1px);
}
.tag-lg{padding:9px 16px;font-size:14px;min-height:40px;background:rgba(180,83,9,0.10);color:var(--c-amber);font-weight:600}
.tag-lg:hover{background:var(--c-amber);color:#fff;border-color:var(--c-amber)}
.tag-xl{
  padding:10px 18px;font-size:15px;min-height:44px;
  background:var(--grad-red);color:#fff !important;font-weight:700;
  box-shadow:0 4px 14px rgba(122,31,31,0.24);
}
.tag-xl:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(122,31,31,0.32)}
.tag-sm{padding:6px 11px;font-size:12px;min-height:32px;color:var(--c-text-s)}

/* ====== 时间线教程 ====== */
.guide{background:var(--c-bg-2)}
.timeline{position:relative;padding-left:40px;max-width:760px;margin:0 auto}
.timeline::before{
  content:"";position:absolute;left:14px;top:8px;bottom:8px;
  width:2px;background:linear-gradient(180deg,var(--c-red),var(--c-amber));
}
.tl-step{
  position:relative;padding-bottom:32px;
  display:grid;grid-template-columns:1fr;gap:6px;
}
.tl-step:last-child{padding-bottom:0}
.tl-num{
  position:absolute;left:-40px;top:0;
  width:32px;height:32px;border-radius:50%;
  background:var(--c-paper);
  border:2.5px solid var(--c-red);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-serif);font-size:13px;font-weight:800;
  color:var(--c-red);z-index:1;
}
.tl-body{
  background:var(--c-paper);
  border:1px solid var(--c-border);
  border-radius:var(--radius);padding:20px 22px;
  transition:box-shadow .2s,border-color .2s;
}
.tl-body:hover{box-shadow:var(--shadow);border-color:var(--c-red)}
.tl-body h3{font-family:var(--font-serif);font-size:18px;color:var(--c-text);margin-bottom:6px}
.tl-body p{font-size:14px;color:var(--c-text-m);line-height:1.75}
.tl-tag{
  display:inline-block;margin-top:10px;
  font-size:11px;padding:3px 10px;
  background:rgba(180,83,9,0.10);color:var(--c-amber);
  border-radius:6px;font-weight:600;letter-spacing:0.5px;
}

/* ====== 对比表 ====== */
.compare-section{background:var(--c-bg)}
.compare-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--radius-lg);border:1.5px solid var(--c-border)}
.compare-table{
  width:100%;border-collapse:collapse;background:var(--c-paper);
  min-width:520px;
}
.compare-table th{
  padding:18px 16px;background:var(--grad-red);color:#fff;
  font-family:var(--font-serif);font-size:15px;font-weight:700;
  text-align:left;
}
.compare-table th:first-child{background:var(--c-red-d)}
.compare-table td{
  padding:14px 16px;border-bottom:1px solid var(--c-border);
  font-size:14px;color:var(--c-text);
}
.compare-table tr:last-child td{border-bottom:0}
.compare-table td.yes{color:var(--c-green);font-weight:500}
.compare-table td.no{color:var(--c-red);font-weight:500}
.compare-table td.partial{color:var(--c-amber);font-weight:500}

/* ====== 用户评价 ====== */
.reviews{background:var(--c-bg-2)}
.reviews-grid{
  display:grid;gap:18px;grid-template-columns:1fr;
}
@media(min-width:640px){.reviews-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.reviews-grid{grid-template-columns:repeat(3,1fr);gap:20px}}
.review-card{
  background:var(--c-paper);
  border:1px solid var(--c-border);border-radius:var(--radius-lg);
  padding:24px 22px;
  transition:transform .2s,box-shadow .2s;
}
.review-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.review-stars{color:var(--c-amber);font-size:15px;margin-bottom:12px;letter-spacing:2px}
.review-text{
  font-family:var(--font-serif);font-style:italic;
  font-size:15px;color:var(--c-text);line-height:1.75;margin-bottom:18px;
}
.review-user{display:flex;align-items:center;gap:10px}
.user-avatar{
  width:38px;height:38px;border-radius:50%;
  background:var(--grad-warm);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-serif);font-size:15px;font-weight:700;
}
.review-user strong{display:block;font-size:13.5px;color:var(--c-text);font-weight:700}
.review-user small{font-size:11.5px;color:var(--c-text-s)}

/* ====== FAQ ====== */
.faq{background:var(--c-bg)}
.faq-list{display:grid;gap:12px;max-width:820px;margin:0 auto}
.faq-item{
  background:var(--c-paper);
  border:1px solid var(--c-border);border-radius:var(--radius);
  overflow:hidden;
  transition:border-color .2s,box-shadow .2s;
}
.faq-item[open]{border-color:var(--c-red);box-shadow:var(--shadow)}
.faq-q{
  padding:18px 56px 18px 22px;font-size:15px;font-weight:600;
  color:var(--c-text);cursor:pointer;position:relative;
  list-style:none;display:block;
}
.faq-q::-webkit-details-marker{display:none}
.faq-q::after{
  content:"+";position:absolute;right:22px;top:50%;transform:translateY(-50%);
  width:24px;height:24px;border-radius:50%;
  background:rgba(122,31,31,0.08);color:var(--c-red);
  display:flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:600;
  transition:transform .2s,background .2s;
}
.faq-item[open] .faq-q::after{transform:translateY(-50%) rotate(45deg);background:var(--c-red);color:#fff}
.faq-a{padding:0 22px 18px;font-size:14px;color:var(--c-text-m);line-height:1.8}

/* ====== 底部CTA ====== */
.cta-final{background:var(--c-bg-2)}
.cta-box{
  background:linear-gradient(135deg,var(--c-red-d) 0%,var(--c-red) 50%,var(--c-amber) 100%);
  border-radius:var(--radius-xl);
  padding:48px 36px;color:#fff;
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
  box-shadow:var(--shadow-lg);position:relative;overflow:hidden;
}
.cta-box::before{
  content:"A³";position:absolute;
  top:-40px;right:-20px;
  font-family:var(--font-serif);font-size:280px;font-weight:900;
  color:rgba(255,255,255,0.05);line-height:1;letter-spacing:-20px;
}
.cta-text{position:relative;z-index:1;flex:1;min-width:280px}
.cta-eyebrow{
  display:inline-block;font-size:12px;letter-spacing:2px;
  padding:4px 12px;background:rgba(255,255,255,0.2);
  border-radius:6px;margin-bottom:14px;font-weight:600;
}
.cta-text h2{font-family:var(--font-serif);font-size:28px;font-weight:800;margin-bottom:8px;line-height:1.2}
@media(min-width:768px){.cta-text h2{font-size:34px}}
.cta-text p{font-size:15px;opacity:0.92;line-height:1.7}
.cta-box .btn-primary{
  background:#fff;color:var(--c-red) !important;
  box-shadow:0 8px 24px rgba(0,0,0,0.18);
  position:relative;z-index:1;
}
.cta-box .btn-primary:hover{box-shadow:0 12px 30px rgba(0,0,0,0.26)}
.cta-box .btn-icon{background:rgba(122,31,31,0.12);color:var(--c-red)}

/* ====== AO3 标签详解 ====== */
.tagxplain{background:var(--c-bg)}
.tagx-grid{
  display:grid;gap:18px;grid-template-columns:1fr;
}
@media(min-width:640px){.tagx-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.tagx-grid{grid-template-columns:repeat(3,1fr);gap:22px}}
.tagx-card{
  background:var(--c-paper);
  border:1.5px solid var(--c-border);border-radius:var(--radius-lg);
  padding:28px 24px;
  position:relative;overflow:hidden;
  transition:transform .25s,box-shadow .25s,border-color .25s;
}
.tagx-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-paper);border-color:var(--c-amber)}
.tagx-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--grad-warm);
}
.tagx-head{
  display:flex;align-items:baseline;gap:10px;
  margin-bottom:14px;flex-wrap:wrap;
}
.tagx-num{
  font-family:var(--font-serif);font-size:13px;font-weight:700;
  color:var(--c-amber);letter-spacing:2px;
  padding:3px 9px;background:rgba(180,83,9,0.10);border-radius:6px;
}
.tagx-head h3{
  font-family:var(--font-serif);font-size:18px;font-weight:700;
  color:var(--c-text);flex:1;
}
.tagx-meta{
  font-size:11px;color:var(--c-text-s);
  padding:2px 8px;background:var(--c-bg-2);border-radius:6px;
  font-weight:500;
}
.tagx-body p{font-size:13.5px;color:var(--c-text-m);line-height:1.75;margin-bottom:10px}
.tagx-list{list-style:none;margin-bottom:10px}
.tagx-list li{
  padding:6px 0;font-size:13px;color:var(--c-text-m);
  border-bottom:1px dashed var(--c-border);
  line-height:1.65;
}
.tagx-list li:last-child{border-bottom:0}
.tagx-list li b{
  display:inline-block;
  font-family:var(--font-serif);color:var(--c-red);font-weight:700;
  margin-right:8px;min-width:110px;
}
.tagx-tip{
  background:rgba(180,83,9,0.08);
  border-left:3px solid var(--c-amber);
  padding:8px 12px;border-radius:0 6px 6px 0;
  font-size:12.5px;color:var(--c-amber);font-weight:500;
  line-height:1.6;margin-top:8px;
}

/* ====== 平台对比 ====== */
.compare-platform{background:var(--c-bg-2)}
.platform-grid{
  display:grid;gap:18px;grid-template-columns:1fr;
}
@media(min-width:640px){.platform-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.platform-grid{grid-template-columns:repeat(4,1fr);gap:20px}}
.platform-card{
  background:var(--c-paper);
  border:1.5px solid var(--c-border);border-radius:var(--radius-lg);
  padding:24px 22px;position:relative;
  transition:transform .25s,box-shadow .25s;
}
.platform-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-paper)}
.platform-card.ao3{
  border-color:var(--c-red);border-width:2px;
  background:linear-gradient(135deg,rgba(122,31,31,0.04),rgba(180,83,9,0.04));
}
.platform-head{
  display:flex;align-items:center;gap:12px;
  margin-bottom:18px;padding-bottom:14px;
  border-bottom:1px solid var(--c-border);
}
.platform-logo{
  width:44px;height:44px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-serif);font-size:20px;font-weight:900;
  color:#fff;flex-shrink:0;
  background:var(--grad-red);
}
.platform-logo.lf{background:linear-gradient(135deg,#15803d,#15803d)}
.platform-logo.bc{background:linear-gradient(135deg,#0e7490,#0891b2)}
.platform-logo.tb{background:linear-gradient(135deg,#374151,#1f2937)}
.platform-head h3{font-family:var(--font-serif);font-size:18px;font-weight:700;color:var(--c-text);line-height:1.2}
.platform-head small{display:block;font-size:11px;color:var(--c-text-s);margin-top:2px}
.platform-badge{
  position:absolute;top:14px;right:14px;
  background:var(--c-red);color:#fff;
  font-size:10px;padding:3px 9px;border-radius:6px;
  font-weight:600;letter-spacing:1px;
}
.platform-list{margin:0;display:grid;grid-template-columns:auto 1fr;gap:6px 12px}
.platform-list dt{
  font-size:12px;color:var(--c-text-s);font-weight:500;
  padding:4px 0;
}
.platform-list dd{
  font-size:13px;color:var(--c-text);font-weight:600;
  padding:4px 0;text-align:right;
}

/* ====== 进阶技巧 ====== */
.tips{background:var(--c-bg)}
.tips-grid{
  display:grid;gap:14px;grid-template-columns:1fr;
}
@media(min-width:640px){.tips-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.tips-grid{grid-template-columns:repeat(3,1fr);gap:16px}}
.tip-card{
  background:var(--c-paper);
  border:1px solid var(--c-border);border-radius:var(--radius);
  padding:22px 20px;position:relative;
  transition:transform .2s,box-shadow .2s,border-color .2s;
}
.tip-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:var(--c-amber)}
.tip-num{
  font-family:var(--font-serif);font-size:24px;font-weight:900;
  color:var(--c-amber);opacity:0.45;
  line-height:1;margin-bottom:8px;letter-spacing:-1px;
}
.tip-card h4{
  font-family:var(--font-serif);font-size:15.5px;font-weight:700;
  color:var(--c-text);margin-bottom:8px;line-height:1.3;
}
.tip-card p{font-size:13px;color:var(--c-text-m);line-height:1.7}
.tip-card code{
  font-family:Consolas,Monaco,monospace;
  background:rgba(122,31,31,0.08);color:var(--c-red);
  padding:1px 6px;border-radius:4px;font-size:12px;font-weight:600;
}

/* ====== Footer ====== */
.footer{
  background:#1a1410;color:#d6cfc7;
  padding:0;
}
.footer-inner{max-width:1200px;margin:0 auto;padding:56px 24px 24px}
.foot-top{
  display:grid;gap:36px;
  grid-template-columns:1fr;
  padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,0.08);
  margin-bottom:24px;
}
@media(min-width:768px){.foot-top{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px}}
.foot-logo{
  width:48px;height:48px;border-radius:12px;
  background:var(--grad-red);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-serif);font-size:22px;font-weight:900;
  margin-bottom:14px;
}
.foot-desc{font-size:13px;line-height:1.75;color:#a8a09a;margin-bottom:14px}
.foot-tip{
  font-size:12px;padding:10px 12px;
  background:rgba(180,83,9,0.14);color:#d97706;
  border-radius:8px;border-left:3px solid var(--c-amber-l);
  line-height:1.6;
}
.foot-col h5{
  font-family:var(--font-serif);font-size:14px;font-weight:700;
  color:#fff;margin-bottom:14px;letter-spacing:0.5px;
}
.foot-col li{margin-bottom:8px}
.foot-col li a{
  color:#a8a09a;font-size:13px;
  transition:color .2s;display:inline-block;
}
.foot-col li a:hover{color:#fff}
.kw-list{display:flex;flex-wrap:wrap;gap:6px}
.kw-list a{
  font-size:11.5px;padding:4px 9px;
  background:rgba(255,255,255,0.06);color:#d6cfc7;
  border-radius:6px;transition:background .2s;
}
.kw-list a:hover{background:var(--c-red);color:#fff}
.foot-bottom{
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;
  font-size:11.5px;color:#8a8278;line-height:1.7;
}

/* ====== 悬浮下载底栏 ====== */
.float-dl{
  position:fixed;left:0;right:0;bottom:0;z-index:50;
  height:var(--float-h);
  background:rgba(250,247,242,0.96);
  backdrop-filter:saturate(180%) blur(16px);
  -webkit-backdrop-filter:saturate(180%) blur(16px);
  border-top:1.5px solid var(--c-border-2);
  box-shadow:0 -6px 24px rgba(122,31,31,0.10);
  padding:0 env(safe-area-inset-left,0) env(safe-area-inset-bottom,0) env(safe-area-inset-right,0);
}
.float-dl-inner{
  max-width:1200px;margin:0 auto;height:100%;
  display:flex;align-items:center;gap:14px;
  padding:0 20px;
}
.float-logo{
  width:42px;height:42px;border-radius:10px;
  background:var(--grad-red);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-serif);font-size:18px;font-weight:900;
  box-shadow:0 4px 12px rgba(122,31,31,0.24);
}
.float-info{flex:1;min-width:0}
.float-name{display:block;font-size:13.5px;font-weight:700;color:var(--c-text)}
.float-sub{display:block;font-size:11.5px;color:var(--c-text-s);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.float-btn{
  padding:11px 22px;border-radius:10px;
  background:var(--grad-red);color:#fff !important;
  font-size:14px;font-weight:700;
  box-shadow:0 4px 14px rgba(122,31,31,0.30);
  white-space:nowrap;min-height:44px;
  display:inline-flex;align-items:center;
}
.float-btn:hover{box-shadow:0 6px 20px rgba(122,31,31,0.38)}

/* ====== 返回顶部 ====== */
.back-top{
  position:fixed;right:20px;bottom:calc(var(--float-h) + 20px);
  width:44px;height:44px;border-radius:50%;
  background:var(--c-card);color:var(--c-red);
  border:1.5px solid var(--c-border-2);
  font-size:20px;font-weight:700;
  box-shadow:var(--shadow);
  z-index:48;
  transition:transform .2s,background .2s;
  display:flex;align-items:center;justify-content:center;
}
.back-top:hover{background:var(--c-red);color:#fff;transform:translateY(-2px)}

/* ============================================================
   移动端响应式（5级断点）
   ============================================================ */

/* ---------- 超窄屏 ≤340px (iPhone 5/SE 320) ---------- */
@media(max-width:340px){
  :root{--topbar-h:34px;--nav-h:58px;--float-h:62px}
  .topbar{font-size:11px;height:34px}
  .topbar-inner{padding:0 14px;gap:8px}
  .topbar-tag{font-size:10px;padding:2px 8px}
  .nav{padding:0 14px;gap:10px;height:58px}
  .brand-mark{width:38px;height:38px;border-radius:10px;font-size:18px}
  .brand-text strong{font-size:14px}
  .brand-text small{display:none}
  .btn-download{padding:8px 12px;font-size:12.5px}
  .btn-download span{display:none}
  .menu-btn{width:38px;height:38px;font-size:18px}
  .container{padding:0 14px}
  .hero{padding:32px 0 44px}
  .hero-grid{padding:0 14px;gap:32px}
  .hero-badge{font-size:11px;padding:6px 10px;margin-bottom:16px;gap:6px}
  .title-mark{font-size:18px}
  .title-cn{font-size:32px;letter-spacing:-0.5px}
  .hero-desc{font-size:13px;line-height:1.75;margin-bottom:24px}
  .hero-meta{grid-template-columns:repeat(2,1fr);gap:8px}
  .meta-item{padding:10px 6px}
  .meta-item b{font-size:18px}
  .meta-item span{font-size:10px}
  .hero-actions{gap:8px}
  .btn-primary,.btn-ghost{padding:11px 14px;font-size:13px;min-height:46px;flex:1;justify-content:center}
  .btn-primary.big,.btn-ghost.big{padding:13px 16px}
  .btn-icon{width:26px;height:26px;font-size:14px}
  .btn-text strong{font-size:13px}
  .btn-text small{font-size:10.5px}
  .phone-mockup{width:240px;padding:10px}
  .phone-float{padding:6px 9px;font-size:10px}
  .phone-float.float-1{left:-4%}
  .phone-float.float-2{right:-4%}
  .section{padding:48px 0}
  .section-head{margin-bottom:32px}
  .eyebrow{font-size:11px;padding:4px 10px}
  .section-title{font-size:22px}
  .section-desc{font-size:13px;line-height:1.7}
  .entrance-grid{gap:12px}
  .entrance-card{padding:20px 16px}
  .entrance-body h3{font-size:16px}
  .entrance-body p{font-size:12.5px}
  .feature-card{padding:22px 18px}
  .feature-card h3{font-size:17px}
  .feature-card p{font-size:13px}
  .tags-box{padding:22px 16px;gap:7px}
  .tag-xl{padding:8px 14px;font-size:13px;min-height:40px}
  .tag-lg{padding:7px 12px;font-size:12.5px;min-height:36px}
  .tag{padding:6px 11px;font-size:11.5px;min-height:32px}
  .tag-sm{padding:5px 9px;font-size:11px;min-height:30px}
  .timeline{padding-left:32px}
  .tl-num{left:-32px;width:26px;height:26px;font-size:11px}
  .tl-body{padding:16px 14px}
  .tl-body h3{font-size:16px}
  .tl-body p{font-size:12.5px}
  .compare-table th,.compare-table td{padding:10px 8px;font-size:12px}
  .compare-table th{font-size:13px}
  .review-card{padding:18px 16px}
  .review-text{font-size:13.5px}
  .faq-q{padding:14px 44px 14px 14px;font-size:13.5px}
  .faq-q::after{width:22px;height:22px;right:14px;font-size:16px}
  .faq-a{padding:0 14px 14px;font-size:13px}
  /* 新增区块：标签详解 */
  .tagx-card{padding:20px 16px}
  .tagx-head{gap:6px;margin-bottom:10px}
  .tagx-num{font-size:11px;padding:2px 7px;letter-spacing:1px}
  .tagx-head h3{font-size:16px;width:100%;order:3}
  .tagx-meta{font-size:10px;padding:2px 7px;order:2;margin-left:auto}
  .tagx-body p{font-size:12.5px;line-height:1.7;margin-bottom:8px}
  .tagx-list li{font-size:12px;padding:5px 0;line-height:1.55}
  .tagx-list li b{min-width:0;display:block;margin-bottom:2px;margin-right:0;font-size:12.5px}
  .tagx-tip{font-size:11.5px;padding:7px 10px;line-height:1.55}
  /* 新增区块：平台对比 */
  .platform-card{padding:18px 16px}
  .platform-head{gap:10px;margin-bottom:14px;padding-bottom:10px}
  .platform-logo{width:38px;height:38px;font-size:17px;border-radius:10px}
  .platform-head h3{font-size:16px}
  .platform-head small{font-size:10.5px}
  .platform-badge{font-size:9px;padding:2px 7px;top:12px;right:12px}
  .platform-list{grid-template-columns:auto 1fr;gap:5px 10px}
  .platform-list dt{font-size:11px;padding:3px 0}
  .platform-list dd{font-size:12px;padding:3px 0}
  /* 新增区块：进阶技巧 */
  .tip-card{padding:16px 14px}
  .tip-num{font-size:20px;margin-bottom:6px}
  .tip-card h4{font-size:14.5px;margin-bottom:6px}
  .tip-card p{font-size:12.5px;line-height:1.65}
  .tip-card code{font-size:11px;padding:1px 5px}
  .cta-box{padding:32px 20px}
  .cta-text h2{font-size:22px}
  .cta-text p{font-size:13px}
  .footer-inner{padding:40px 14px 14px}
  .foot-top{gap:24px}
  .foot-desc{font-size:12px}
  .float-dl-inner{padding:0 14px;gap:10px}
  .float-logo{width:36px;height:36px;font-size:15px}
  .float-name{font-size:12.5px}
  .float-sub{font-size:10.5px}
  .float-btn{padding:9px 14px;font-size:12.5px}
  .back-top{right:14px;bottom:74px;width:40px;height:40px}
  .drawer.open{padding:10px 14px 14px}
  .drawer a{padding:12px 14px;font-size:14px;min-height:44px}
}

/* ---------- 小屏手机 341-380px ---------- */
@media(min-width:341px) and (max-width:380px){
  :root{--topbar-h:36px;--nav-h:60px}
  .topbar{font-size:12px;height:36px}
  .topbar-inner{padding:0 16px;gap:8px}
  .topbar-tag{font-size:10.5px;padding:2px 9px;flex-shrink:0}
  .topbar-text{font-size:11.5px}
  .nav{padding:0 16px;gap:12px}
  .brand-text small{display:none}
  .btn-download span{display:none}
  .hero{padding:36px 0 52px}
  .hero-grid{padding:0 16px;gap:36px}
  .title-cn{font-size:36px}
  .hero-desc{font-size:13.5px}
  .hero-meta{grid-template-columns:repeat(2,1fr)}
  .btn-primary,.btn-ghost{flex:1;justify-content:center}
  .phone-mockup{width:250px}
  .section{padding:56px 0}
  .section-title{font-size:24px}
  .entrance-card{padding:22px 18px}
  .feature-card{padding:24px 20px}
  .tags-box{padding:26px 18px}
  .tag-xl{padding:9px 16px;font-size:14px}
  .timeline{padding-left:36px}
  .faq-q{padding:15px 46px 15px 16px;font-size:14px}
  .faq-a{padding:0 16px 15px;font-size:13.5px}
  /* 新增区块 */
  .tagx-card{padding:22px 18px}
  .tagx-head h3{font-size:17px}
  .tagx-list li{font-size:12.5px}
  .tagx-list li b{font-size:13px;display:block;min-width:0;margin-bottom:3px}
  .platform-card{padding:20px 18px}
  .tip-card{padding:18px 16px}
  .tip-card h4{font-size:15px}
  .cta-box{padding:36px 24px}
  .footer-inner{padding:48px 16px 16px}
}

/* ---------- 中屏手机 381-480px ---------- */
@media(min-width:381px) and (max-width:480px){
  .topbar{font-size:12.5px}
  .topbar-tag{font-size:11px;flex-shrink:0}
  .topbar-text{font-size:12px}
  .nav{padding:0 18px;gap:14px}
  .brand-text small{display:none}
  .hero{padding:40px 0 56px}
  .title-cn{font-size:42px}
  .hero-desc{font-size:14px}
  .hero-meta{grid-template-columns:repeat(4,1fr);gap:8px}
  .meta-item b{font-size:18px}
  .btn-primary,.btn-ghost{flex:1;justify-content:center}
  .section{padding:64px 0}
  .section-title{font-size:26px}
  .entrance-card{padding:24px 20px}
  .feature-card{padding:26px 22px}
  .tags-box{padding:30px 22px}
  /* 新增区块 */
  .tagx-card{padding:24px 20px}
  .tagx-list li b{min-width:90px;display:inline-block;margin-right:6px}
  .platform-card{padding:22px 20px}
  .tip-card{padding:20px 18px}
  .cta-box{padding:40px 28px}
}

/* ---------- 大屏手机/小平板 481-768px ---------- */
@media(min-width:481px) and (max-width:768px){
  .hero{padding:56px 0 72px}
  .title-cn{font-size:48px}
  .hero-desc{font-size:14.5px}
  .section{padding:72px 0}
  .section-title{font-size:30px}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
  .faq-list{grid-template-columns:1fr}
  /* 新增区块 */
  .tagx-card{padding:26px 22px}
  .tagx-list li b{min-width:100px}
  .platform-card{padding:24px 22px}
  .tip-card{padding:22px 20px}
}

/* ---------- 平板 769-1023px ---------- */
@media(min-width:769px) and (max-width:1023px){
  .hero-grid{gap:48px}
  .title-cn{font-size:54px}
  .entrance-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(3,1fr)}
  /* 新增区块 */
  .tagx-grid{grid-template-columns:repeat(2,1fr)}
  .platform-grid{grid-template-columns:repeat(2,1fr)}
  .tips-grid{grid-template-columns:repeat(2,1fr)}
}

/* ---------- 安全区 / 触控优化 ---------- */
.float-dl,.btn-primary,.btn-ghost,.btn-download,.float-btn,
.menu-btn,.back-top,.faq-q,.tag,.drawer a,.entrance-card,.review-card,
.feature-card,.tl-body,.info-row,
.tagx-card,.tagx-list li b,.tagx-tip,
.platform-card,.platform-logo,
.tip-card,.tip-card code{
  -webkit-tap-highlight-color:transparent;
  touch-action:manipulation;
}

/* ---------- 防溢出 ---------- */
.hero-grid,.entrance-grid,.app-grid,.feature-grid,.tags-box,
.timeline,.reviews-grid,.faq-list,.cta-box,.footer-inner,.float-dl-inner,
.tagx-grid,.tagx-card,.platform-grid,.platform-card,.tips-grid,.tip-card{
  overflow-x:hidden;
}

/* ---------- 大屏增强 ---------- */
@media(min-width:1280px){
  .section{padding:110px 0}
  .hero{padding:100px 0 120px}
}