/* ===== 9x阅读器 · 9xread.com.cn =====
   主题：白底 + 主红 #e00000（源自官方logo）+ 深红渐变 + 灰文
   色彩源自官方logo图片主色调
   移动端：5级断点 340 / 380 / 480 / 768 / 1023
   =========================================== */

:root{
  --c-bg:#ffffff;             /* 纯白底 */
  --c-bg-2:#fff5f5;          /* 淡红米白 */
  --c-card:#ffffff;
  --c-border:rgba(224,0,0,0.16);
  --c-text:#1f2937;           /* 深灰文字 */
  --c-text-2:#6b7280;         /* 次要文字 */
  --c-red:#e00000;            /* 主红（源自logo #e00000） */
  --c-red-d:#b80000;          /* 深红 */
  --c-red-l:#ff3b3b;          /* 亮红 */
  --c-red-xl:#ffe5e5;         /* 浅红 */
  --c-amber:#b45309;          /* 琥珀点缀 */
  --c-cream:#fff8e7;          /* 奶油 */
  --c-gold:#fbbf24;           /* 金色评分 */
  --grad-main:linear-gradient(135deg,#e00000 0%,#b80000 100%);         /* 主红渐变 */
  --grad-red:linear-gradient(135deg,#b80000 0%,#e00000 50%,#ff3b3b 100%);
  --grad-hero:radial-gradient(circle at 20% 30%,rgba(224,0,0,0.10),transparent 60%),radial-gradient(circle at 80% 70%,rgba(255,59,59,0.10),transparent 55%);
  --radius:14px;
  --radius-sm:10px;
  --nav-h:68px;
  --topbar-h:38px;
  --float-h:76px;
}

/* ===== Reset ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Helvetica Neue",Helvetica,Arial,sans-serif;
  background:var(--c-bg);
  color:var(--c-text);
  line-height:1.75;
  font-size:16px;
  overflow-x:hidden;
  padding-top:calc(var(--topbar-h) + var(--nav-h));
  padding-bottom:calc(var(--float-h) + env(safe-area-inset-bottom,0));
}
a{color:inherit;text-decoration:none;transition:color .2s}
a:hover{color:var(--c-red)}
img{max-width:100%;height:auto;display:block}
button{cursor:pointer;font-family:inherit;border:none;background:none}
ul,ol{list-style:none}
svg{display:block}

/* ===== Skip Link ===== */
.skip-link{position:absolute;left:-9999px;top:0;background:var(--c-red);color:#fff;padding:10px 16px;z-index:999;border-radius:0 0 8px 0}
.skip-link:focus{left:0}

/* ===== Topbar 公告条 ===== */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:60;
  height:var(--topbar-h);
  background:var(--grad-main);
  color:#fff;
  font-size:13px;
  box-shadow:0 1px 0 rgba(255,255,255,0.10);
}
.topbar-inner{
  max-width:1280px;margin:0 auto;
  height:100%;padding:0 24px;
  display:flex;align-items:center;gap:12px;
}
.topbar-tag{
  background:rgba(255,255,255,0.20);
  padding:3px 10px;border-radius:6px;
  font-size:11px;flex-shrink:0;font-weight:600;letter-spacing:1px;
}
.topbar-text{
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  flex:1;opacity:0.95;
}

/* ===== Header ===== */
.header{
  position:fixed;top:var(--topbar-h);left:0;right:0;z-index:55;
  height:var(--nav-h);
  background:rgba(255,255,255,0.92);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--c-border);
}
.nav{
  max-width:1280px;margin:0 auto;
  height:100%;padding:0 24px;
  display:flex;align-items:center;gap:20px;
}
.brand{
  display:flex;align-items:center;gap:10px;
  margin-right:auto;
}
.brand-mark{
  width:40px;height:40px;border-radius:10px;
  object-fit:cover;
  flex-shrink:0;
}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text strong{font-size:18px;font-weight:900;color:var(--c-red-d);letter-spacing:1px}
.brand-text small{font-size:11px;color:var(--c-text-2);letter-spacing:0.5px}
.nav-list{
  display:flex;align-items:center;gap:6px;
}
.nav-list li a{
  display:block;padding:8px 14px;border-radius:8px;
  font-size:15px;font-weight:500;color:var(--c-text);
  transition:background .2s,color .2s;
}
.nav-list li a:hover{background:var(--c-red-xl);color:var(--c-red-d)}

.btn-download{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--grad-main);color:#fff !important;
  padding:10px 18px;border-radius:10px;
  font-size:14px;font-weight:700;
  box-shadow:0 4px 14px rgba(224,0,0,0.30);
  transition:transform .2s,box-shadow .2s;
}
.btn-download:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(224,0,0,0.40)}

.menu-btn{
  display:none;width:40px;height:40px;
  align-items:center;justify-content:center;
  color:var(--c-text);border-radius:8px;
}
.menu-btn:hover{background:var(--c-red-xl)}

/* ===== 移动抽屉 ===== */
.drawer-backdrop{
  position:fixed;inset:0;background:rgba(0,0,0,0.45);
  z-index:90;opacity:0;pointer-events:none;
  transition:opacity .25s;
}
.drawer-backdrop.show{opacity:1;pointer-events:auto}
.mobile-drawer{
  position:fixed;top:0;right:-280px;width:280px;max-width:100vw;
  height:100vh;background:#fff;z-index:100;
  padding:calc(var(--topbar-h) + var(--nav-h)) 20px 20px;
  display:flex;flex-direction:column;gap:6px;
  transition:right .25s;
  box-shadow:-4px 0 20px rgba(0,0,0,0.10);
  overflow-y:auto;
}
.mobile-drawer.open{right:0}
.mobile-drawer a{
  display:block;padding:14px 16px;border-radius:8px;
  font-size:16px;font-weight:500;color:var(--c-text);
  border-bottom:1px solid var(--c-border);
}
.mobile-drawer a:hover{background:var(--c-red-xl);color:var(--c-red-d)}
.mobile-drawer .drawer-dl{
  margin-top:16px;background:var(--grad-main);color:#fff !important;
  text-align:center;border:none;font-weight:700;
  box-shadow:0 4px 14px rgba(224,0,0,0.30);
}

/* ===== 通用容器/区块 ===== */
.container{max-width:1280px;margin:0 auto;padding:0 24px;width:100%}
.section{padding:80px 0;position:relative}
.section + .section{border-top:1px solid var(--c-border)}

/* ===== 面包屑导航 ===== */
.breadcrumb{
  padding:14px 0;background:#fff;
  border-bottom:1px solid var(--c-border);
  font-size:13px;
}
.breadcrumb ol{
  display:flex;align-items:center;gap:8px;
  color:var(--c-text-2);flex-wrap:wrap;
}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li a{color:var(--c-red-d);font-weight:500}
.breadcrumb li a:hover{text-decoration:underline}
.breadcrumb li:last-child{color:var(--c-text);font-weight:600}
.head-center{text-align:center;margin-bottom:48px}
.head-left{margin-bottom:48px}
.eyebrow{
  display:inline-block;font-size:12px;font-weight:700;letter-spacing:2px;
  color:var(--c-red);background:var(--c-red-xl);
  padding:4px 12px;border-radius:6px;margin-bottom:14px;
  text-transform:uppercase;
}
.section-title{
  font-size:34px;font-weight:900;color:var(--c-text);
  margin-bottom:12px;letter-spacing:-0.5px;
}
.section-desc{
  font-size:16px;color:var(--c-text-2);
  max-width:680px;line-height:1.75;
}
.head-center .section-desc{margin:0 auto}

/* ===== 按钮 ===== */
.btn-primary{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--grad-main);color:#fff !important;
  padding:12px 22px;border-radius:10px;
  font-size:15px;font-weight:700;
  box-shadow:0 4px 14px rgba(224,0,0,0.30);
  transition:transform .2s,box-shadow .2s;
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(224,0,0,0.40)}
.btn-primary.big{padding:16px 30px;font-size:17px}
.btn-primary .btn-icon{font-size:18px;font-weight:900}
.btn-primary .btn-text{display:flex;flex-direction:column;line-height:1.2}
.btn-primary .btn-text strong{font-size:17px;font-weight:800}
.btn-primary .btn-text small{font-size:12px;opacity:0.85;font-weight:500}
.btn-ghost{
  display:inline-flex;align-items:center;gap:6px;
  background:#fff;color:var(--c-red-d) !important;
  border:2px solid var(--c-red);
  padding:10px 22px;border-radius:10px;
  font-size:15px;font-weight:700;
  transition:background .2s,color .2s;
}
.btn-ghost:hover{background:var(--c-red);color:#fff !important}

/* ===== Hero ===== */
.hero{
  position:relative;overflow:hidden;
  padding:60px 0 80px;
}
.hero-bg{
  position:absolute;inset:0;
  background:var(--grad-hero);
  z-index:0;
}
.hero-inner{
  position:relative;z-index:1;
  display:grid;grid-template-columns:1.1fr 1fr;gap:60px;
  align-items:center;
}
.hero-content{max-width:600px}
.hero-eyebrow{
  display:inline-block;font-size:12px;font-weight:700;
  letter-spacing:3px;color:var(--c-red);
  background:var(--c-red-xl);padding:6px 14px;
  border-radius:6px;margin-bottom:18px;
}
.hero-name{
  font-size:64px;font-weight:900;letter-spacing:-2px;
  color:var(--c-red-d);line-height:1.05;
  margin-bottom:16px;
}
.hero-title{
  font-size:28px;font-weight:700;color:var(--c-text);
  margin-bottom:18px;letter-spacing:-0.5px;
}
.hero-desc{
  font-size:17px;color:var(--c-text-2);
  line-height:1.8;margin-bottom:32px;
}
.hero-cta{display:flex;gap:14px;margin-bottom:36px;flex-wrap:wrap}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
  padding:24px 0;border-top:1px solid var(--c-border);
}
.stat{display:flex;flex-direction:column}
.stat-num{
  font-size:26px;font-weight:900;color:var(--c-red-d);
  font-family:Georgia,serif;line-height:1;
}
.stat-label{font-size:13px;color:var(--c-text-2);margin-top:4px}

/* ===== Hero Phone Mockup ===== */
.hero-visual{position:relative;display:flex;justify-content:center;align-items:center}
.phone-mockup{
  position:relative;width:280px;height:480px;
  background:#1a1a1a;border-radius:36px;
  padding:12px;
  box-shadow:0 30px 60px rgba(224,0,0,0.20),0 12px 30px rgba(0,0,0,0.15);
  z-index:2;
}
.phone-notch{
  position:absolute;top:14px;left:50%;transform:translateX(-50%);
  width:80px;height:6px;background:#000;border-radius:3px;z-index:3;
}
.phone-screen{
  background:#fafafa;border-radius:26px;
  height:100%;overflow:hidden;
  padding:34px 18px 18px;display:flex;flex-direction:column;
}
.phone-bar{
  display:flex;justify-content:space-between;
  font-size:11px;color:#666;font-weight:600;
  margin-bottom:14px;
}
.phone-title{font-size:18px;font-weight:900;color:#1a1a1a;margin-bottom:4px}
.phone-chapter{font-size:12px;color:#888;margin-bottom:12px;padding-bottom:10px;border-bottom:1px solid #eee}
.phone-text{
  font-size:12px;color:#333;line-height:1.8;
  margin-bottom:10px;text-indent:2em;
}
.phone-progress{
  margin-top:auto;height:4px;background:#eee;border-radius:2px;overflow:hidden;
}
.phone-progress-bar{height:100%;background:var(--grad-main)}
.phone-footer{
  display:flex;justify-content:space-between;
  font-size:11px;color:#666;margin-top:6px;
}
.hero-float{
  position:absolute;background:var(--grad-main);color:#fff;
  padding:8px 14px;border-radius:8px;font-size:13px;font-weight:800;
  box-shadow:0 8px 20px rgba(224,0,0,0.30);z-index:3;
  letter-spacing:1px;
}
.hero-float-1{top:20%;left:-10px;transform:rotate(-8deg)}
.hero-float-2{top:50%;right:-12px;transform:rotate(6deg)}
.hero-float-3{bottom:18%;left:8px;transform:rotate(-4deg)}

.hero-scroll{
  position:absolute;bottom:24px;left:50%;transform:translateX(-50%);
  color:var(--c-red);z-index:2;
  animation:bounce 1.6s infinite;
}
@keyframes bounce{
  0%,100%{transform:translate(-50%,0)}
  50%{transform:translate(-50%,8px)}
}

/* ===== 官网入口 ===== */
.entrance{background:var(--c-bg-2)}
.entrance-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:18px;
}
.entrance-card{
  display:block;background:var(--c-card);
  border:1px solid var(--c-border);
  border-radius:var(--radius);padding:24px 22px;
  position:relative;transition:transform .2s,box-shadow .2s;
}
.entrance-card:hover{
  transform:translateY(-3px);
  box-shadow:0 12px 28px rgba(224,0,0,0.10);
}
.entrance-card.primary{
  background:var(--grad-main);color:#fff;border:none;
}
.entrance-card.accent{
  background:#fff;border:2px solid var(--c-red);
}
.ent-tag{
  display:inline-block;font-size:11px;font-weight:700;
  padding:3px 10px;border-radius:6px;
  background:var(--c-red-xl);color:var(--c-red-d);
  margin-bottom:10px;letter-spacing:1px;
}
.entrance-card.primary .ent-tag{background:rgba(255,255,255,0.20);color:#fff}
.entrance-card strong{
  display:block;font-size:19px;font-weight:800;
  color:var(--c-text);margin-bottom:6px;
}
.entrance-card.primary strong{color:#fff}
.entrance-card.accent strong{color:var(--c-red-d)}
.ent-desc{
  font-size:14px;color:var(--c-text-2);line-height:1.6;
  display:block;margin-bottom:8px;
}
.entrance-card.primary .ent-desc{color:rgba(255,255,255,0.92)}
.ent-arrow{
  position:absolute;top:24px;right:22px;
  font-size:20px;font-weight:900;color:var(--c-red);
}
.entrance-card.primary .ent-arrow{color:#fff}

/* ===== APP下载 ===== */
.app-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px;
}
.app-card{
  background:var(--c-card);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:28px 24px;
  transition:transform .2s,box-shadow .2s;
  display:flex;flex-direction:column;
}
.app-card:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(224,0,0,0.10)}
.app-head{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.app-icon{font-size:36px}
.app-head h3{font-size:19px;font-weight:800;color:var(--c-text);margin-bottom:2px}
.app-head small{font-size:13px;color:var(--c-text-2)}
.app-list{margin-bottom:20px;flex:1}
.app-list li{
  font-size:14px;color:var(--c-text);padding:5px 0;
  padding-left:22px;position:relative;line-height:1.6;
}
.app-list li::before{
  content:"✓";position:absolute;left:0;top:5px;
  color:var(--c-red);font-weight:900;font-size:13px;
}
.app-card .btn-primary{align-self:flex-start}

.security-row{
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;
  margin-top:36px;padding:24px;
  background:var(--c-bg-2);border-radius:var(--radius);
}
.security-item{display:flex;align-items:center;gap:10px}
.sec-icon{
  width:36px;height:36px;border-radius:50%;
  background:var(--grad-main);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:900;flex-shrink:0;
}
.security-item strong{display:block;font-size:14px;font-weight:700;color:var(--c-text)}
.security-item small{font-size:12px;color:var(--c-text-2)}

/* ===== 功能特色 ===== */
.features{background:var(--c-bg-2)}
.feature-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px;
}
.feature-card{
  background:var(--c-card);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:28px 24px;
  position:relative;overflow:hidden;
  transition:transform .2s,box-shadow .2s;
}
.feature-card:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(224,0,0,0.10)}
.feature-num{
  position:absolute;top:18px;right:22px;
  font-size:42px;font-weight:900;color:var(--c-red-xl);
  font-family:Georgia,serif;line-height:1;
}
.feature-card h3{
  font-size:19px;font-weight:800;color:var(--c-text);
  margin-bottom:10px;max-width:75%;
}
.feature-card p{
  font-size:14px;color:var(--c-text-2);line-height:1.7;
  margin-bottom:14px;
}
.feature-tags{display:flex;flex-wrap:wrap;gap:6px}
.feature-tags li{
  font-size:12px;font-weight:600;
  padding:3px 10px;border-radius:6px;
  background:var(--c-red-xl);color:var(--c-red-d);
}

/* ===== 书库分类 ===== */
.cat-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
}
.cat-card{
  display:block;background:var(--c-card);
  border:1px solid var(--c-border);
  border-radius:var(--radius);padding:24px 18px;
  text-align:center;transition:transform .2s,box-shadow .2s;
  position:relative;
}
.cat-card:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(224,0,0,0.10)}
.cat-emoji{
  font-size:42px;height:60px;
  display:flex;align-items:center;justify-content:center;
}
.cat-card h3{font-size:17px;font-weight:800;color:var(--c-text);margin-bottom:6px}
.cat-card p{font-size:12px;color:var(--c-text-2);margin-bottom:10px}
.cat-count{
  display:inline-block;font-size:11px;font-weight:700;
  padding:3px 10px;border-radius:6px;
  background:var(--c-red-xl);color:var(--c-red-d);
}

/* ===== 使用教程 Timeline ===== */
.guide{background:var(--c-bg-2)}
.timeline{position:relative;max-width:880px;margin:0 auto}
.timeline::before{
  content:"";position:absolute;
  left:24px;top:0;bottom:0;width:2px;
  background:var(--c-red-xl);
}
.tl-item{
  position:relative;padding-left:60px;margin-bottom:28px;
}
.tl-num{
  position:absolute;left:0;top:0;
  width:48px;height:48px;border-radius:50%;
  background:var(--grad-main);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:900;font-family:Georgia,serif;
  box-shadow:0 4px 14px rgba(224,0,0,0.30);
  z-index:2;
}
.tl-body{
  background:var(--c-card);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:22px 22px;
}
.tl-body h4{font-size:17px;font-weight:800;color:var(--c-text);margin-bottom:8px}
.tl-body p{font-size:14px;color:var(--c-text-2);line-height:1.7}

/* ===== 更新日志 ===== */
.updates-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;
}
.update-card{
  background:var(--c-card);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:22px 20px;
  position:relative;
}
.update-tag{
  display:inline-block;font-size:11px;padding:3px 10px;
  border-radius:6px;font-weight:700;margin-bottom:10px;
}
.update-tag.new{background:var(--c-red);color:#fff}
.update-tag.fix{background:#fef3c7;color:#92400e}
.update-tag.info{background:#dbeafe;color:#1e40af}
.update-card h4{font-size:16px;font-weight:800;color:var(--c-text);margin-bottom:8px}
.update-card p{font-size:13px;color:var(--c-text-2);line-height:1.7;margin-bottom:8px}
.update-card small{font-size:12px;color:var(--c-text-2);font-family:Georgia,serif}

/* ===== 平台对比 ===== */
.platforms{background:var(--c-bg-2)}
.platform-scroll{
  overflow-x:auto;-webkit-overflow-scrolling:touch;
  background:#fff;border-radius:var(--radius);
  border:1px solid var(--c-border);
  padding:4px;
  position:relative;
}
.platform-scroll::-webkit-scrollbar{height:6px}
.platform-scroll::-webkit-scrollbar-thumb{background:var(--c-red);border-radius:3px}
.platform-scroll::-webkit-scrollbar-track{background:var(--c-red-xl);border-radius:3px}
.platform-scroll-hint{
  display:none;font-size:12px;color:var(--c-red-d);
  text-align:center;padding:6px 0 0;
  font-weight:500;letter-spacing:1px;
}
.platform-table{
  width:100%;border-collapse:collapse;
  min-width:680px;
}
.platform-table th,.platform-table td{
  padding:14px 12px;text-align:left;
  border-bottom:1px solid var(--c-border);
  font-size:14px;
}
.platform-table th{
  background:var(--c-bg-2);font-weight:700;color:var(--c-text);
  white-space:nowrap;
}
.platform-table th.col-hl{
  background:var(--c-red);color:#fff;
}
.platform-table td.col-hl{
  background:var(--c-red-xl);color:var(--c-red-d);font-weight:700;
}
.platform-table tbody tr:last-child td{border-bottom:none}

/* ===== 进阶技巧 ===== */
.tips-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:16px;
}
.tip-card{
  background:var(--c-card);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:22px 20px;
  position:relative;overflow:hidden;
}
.tip-num{
  position:absolute;top:14px;right:18px;
  font-size:38px;font-weight:900;color:var(--c-red-xl);
  font-family:Georgia,serif;line-height:1;
}
.tip-card h4{
  font-size:16px;font-weight:800;color:var(--c-text);
  margin-bottom:8px;max-width:80%;
}
.tip-card p{font-size:14px;color:var(--c-text-2);line-height:1.7}
.tip-card code{
  background:var(--c-red-xl);color:var(--c-red-d);
  padding:2px 6px;border-radius:4px;
  font-family:Menlo,Monaco,monospace;font-size:12px;
}

/* ===== 标签云 ===== */
.tagcloud{background:var(--c-bg-2)}
.tags-box{
  display:flex;flex-wrap:wrap;gap:8px;justify-content:center;
  padding:24px;background:#fff;border-radius:var(--radius);
  border:1px solid var(--c-border);
}
.tags-box a{
  display:inline-block;padding:6px 12px;
  border-radius:6px;font-size:13px;
  background:var(--c-bg-2);color:var(--c-text);
  transition:background .2s,color .2s;
  min-height:32px;display:inline-flex;align-items:center;
}
.tags-box a:hover{background:var(--c-red);color:#fff}
.tag-xl{font-size:16px !important;font-weight:700 !important;background:var(--c-red-xl) !important;color:var(--c-red-d) !important;padding:8px 14px !important}
.tag-lg{font-size:14px !important;font-weight:600 !important;background:var(--c-red-xl) !important;color:var(--c-red-d) !important}
.tag-md{font-size:13px !important}
.tag-sm{font-size:12px !important;color:var(--c-text-2) !important}

/* ===== 用户评价 ===== */
.reviews-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;
}
.review-card{
  background:var(--c-card);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:24px 22px;
  display:flex;flex-direction:column;
}
.review-stars{
  color:var(--c-gold);font-size:18px;letter-spacing:2px;
  margin-bottom:10px;
}
.review-card p{
  font-size:14px;color:var(--c-text);line-height:1.8;
  margin-bottom:14px;flex:1;
  font-style:italic;
}
.review-author{display:flex;justify-content:space-between;align-items:center}
.review-author strong{font-size:14px;font-weight:700;color:var(--c-red-d)}
.review-author small{font-size:12px;color:var(--c-text-2);font-family:Georgia,serif}

/* ===== FAQ ===== */
.faq{background:var(--c-bg-2)}
.faq-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.faq-item{
  background:var(--c-card);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:18px 20px;
  transition:box-shadow .2s;
}
.faq-item[open]{box-shadow:0 6px 18px rgba(224,0,0,0.08)}
.faq-q{
  font-size:15px;font-weight:700;color:var(--c-text);
  cursor:pointer;list-style:none;
  display:flex;justify-content:space-between;align-items:center;
  gap:10px;
}
.faq-q::-webkit-details-marker{display:none}
.faq-q::after{
  content:"+";font-size:20px;font-weight:900;
  color:var(--c-red);flex-shrink:0;
  transition:transform .2s;
}
.faq-item[open] .faq-q::after{content:"−"}
.faq-a{margin-top:12px;padding-top:12px;border-top:1px solid var(--c-border)}
.faq-a p{font-size:14px;color:var(--c-text-2);line-height:1.8}
.faq-a b{color:var(--c-red-d);font-weight:700}

/* ===== FAQ相关推荐内链 ===== */
.faq-related{
  margin-top:28px;padding:24px 22px;
  background:#fff;border-radius:var(--radius);
  border:1px solid var(--c-border);
}
.faq-related h3{
  font-size:16px;font-weight:800;color:var(--c-red-d);
  margin-bottom:14px;letter-spacing:0.5px;
}
.faq-related ul li{
  font-size:14px;color:var(--c-text-2);
  padding:6px 0;line-height:1.7;
}
.faq-related ul li a{
  color:var(--c-red-d);font-weight:500;
  border-bottom:1px dotted var(--c-red);
  margin:0 2px;
}
.faq-related ul li a:hover{background:var(--c-red-xl)}

/* ===== 底部CTA ===== */
.cta-final{padding:60px 0}
.cta-box{
  background:var(--grad-main);color:#fff;
  border-radius:20px;padding:48px 40px;
  display:flex;align-items:center;justify-content:space-between;
  gap:24px;flex-wrap:wrap;
  box-shadow:0 20px 40px rgba(224,0,0,0.20);
}
.cta-text{flex:1;min-width:280px}
.cta-eyebrow{
  display:inline-block;font-size:12px;font-weight:700;
  letter-spacing:2px;background:rgba(255,255,255,0.20);
  padding:4px 12px;border-radius:6px;margin-bottom:10px;
}
.cta-text h2{font-size:28px;font-weight:900;margin-bottom:8px}
.cta-text p{font-size:15px;opacity:0.92}
.cta-box .btn-primary{
  background:#fff;color:var(--c-red-d) !important;
  box-shadow:0 8px 20px rgba(0,0,0,0.15);
}
.cta-box .btn-primary:hover{transform:translateY(-2px)}

/* ===== 页脚 ===== */
.footer{background:#1a1a1a;color:#fff;padding:60px 0 30px}
.footer-inner{max-width:1280px;margin:0 auto;padding:0 24px}
.foot-top{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;
  padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,0.10);
}
.foot-brand{display:flex;flex-direction:column;gap:10px}
.foot-logo{width:48px;height:48px;border-radius:10px}
.foot-desc{font-size:14px;color:rgba(255,255,255,0.70);line-height:1.7}
.foot-tip{font-size:13px;color:rgba(255,255,255,0.50);margin-top:6px}
.foot-col h5{
  font-size:14px;font-weight:800;color:#fff;
  margin-bottom:14px;letter-spacing:1px;
}
.foot-col ul li{margin-bottom:4px}
.foot-col ul li a{
  display:inline-block;
  font-size:14px;color:rgba(255,255,255,0.70);
  padding:6px 0;min-height:32px;
  transition:color .2s;
}
.foot-col ul li a:hover{color:var(--c-red-l)}
.kw-list{display:flex;flex-wrap:wrap;gap:6px}
.kw-list a{
  display:inline-flex;align-items:center;
  font-size:12px;padding:8px 12px;min-height:32px;
  background:rgba(255,255,255,0.08);border-radius:6px;
  color:rgba(255,255,255,0.70);
}
.kw-list a:hover{background:var(--c-red);color:#fff}
.foot-bottom{
  padding-top:24px;text-align:center;
  font-size:13px;color:rgba(255,255,255,0.50);
}
.foot-bottom p{margin-bottom:6px}
.foot-bottom a{color:rgba(255,255,255,0.70)}
.foot-bottom a:hover{color:var(--c-red-l)}

/* ===== 悬浮下载条 ===== */
.float-dl{
  position:fixed;bottom:0;left:0;right:0;z-index:50;
  background:rgba(255,255,255,0.96);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-top:1px solid var(--c-border);
  padding:12px 16px;
  padding-bottom:calc(12px + env(safe-area-inset-bottom,0));
  box-shadow:0 -4px 20px rgba(0,0,0,0.06);
}
.float-dl-inner{
  max-width:1280px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;gap:14px;
}
.float-info{display:flex;align-items:center;gap:10px;min-width:0;flex:1}
.float-info img{width:36px;height:36px;border-radius:8px;flex-shrink:0}
.float-text{display:flex;flex-direction:column;min-width:0}
.float-text strong{font-size:14px;font-weight:800;color:var(--c-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.float-text small{font-size:12px;color:var(--c-text-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.float-dl .btn-primary{padding:10px 18px;font-size:14px;flex-shrink:0}

/* ===== 返回顶部 ===== */
.back-top{
  position:fixed;bottom:calc(var(--float-h) + 16px);right:20px;
  width:44px;height:44px;border-radius:50%;
  background:var(--grad-main);color:#fff;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 6px 18px rgba(224,0,0,0.30);
  opacity:0;pointer-events:none;
  transition:opacity .25s,transform .2s;
  z-index:45;
}
.back-top.show{opacity:1;pointer-events:auto}
.back-top:hover{transform:translateY(-2px)}

/* ============================================
   响应式 · 断点1：769px - 1023px（平板）
   ============================================ */
@media (max-width:1023px){
  .container{padding:0 20px}
  .section{padding:64px 0}
  .hero{padding:48px 0 64px}
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero-content{max-width:none}
  .hero-name{font-size:52px}
  .hero-title{font-size:24px}
  .hero-visual{order:-1}
  .phone-mockup{width:240px;height:420px}
  .hero-float-1{left:0}
  .hero-float-2{right:0}
  .hero-float-3{left:12px}
  .section-title{font-size:28px}
  .entrance-grid{grid-template-columns:1fr}
  .app-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .cat-grid{grid-template-columns:repeat(3,1fr)}
  .updates-grid{grid-template-columns:repeat(2,1fr)}
  .tips-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
  .faq-list{grid-template-columns:1fr}
  .security-row{grid-template-columns:repeat(2,1fr)}
  .foot-top{grid-template-columns:1fr 1fr;gap:28px}
  .foot-brand{grid-column:1 / -1}
}

/* ============================================
   响应式 · 断点2：481px - 768px（大手机）
   ============================================ */
@media (max-width:768px){
  /* 移动端显示表格滑动提示 */
  .platform-scroll-hint{display:block !important}
  :root{
    --nav-h:60px;
    --topbar-h:34px;
    --float-h:70px;
  }
  .breadcrumb{padding:10px 0;font-size:12px}
  .breadcrumb ol{gap:6px}
  .container{padding:0 18px}
  .nav{padding:0 18px;gap:10px}
  .nav-list{display:none}
  .menu-btn{display:flex}
  .btn-download{padding:8px 14px;font-size:13px}
  .btn-download span{display:none}
  .btn-download svg{width:20px;height:20px}
  .brand-text strong{font-size:16px}
  .brand-text small{font-size:10px}
  .brand-mark{width:34px;height:34px}

  .section{padding:52px 0}
  .hero{padding:32px 0 48px}
  .hero-inner{gap:32px}
  .hero-name{font-size:42px}
  .hero-title{font-size:21px}
  .hero-desc{font-size:15px}
  .hero-cta{gap:10px}
  .btn-primary.big{padding:14px 24px;font-size:15px}
  .btn-ghost{padding:10px 18px;font-size:14px}
  .hero-stats{grid-template-columns:repeat(4,1fr);gap:10px;padding:18px 0}
  .stat-num{font-size:20px}
  .stat-label{font-size:11px}

  .phone-mockup{width:220px;height:400px;padding:10px}
  .phone-screen{padding:30px 14px 14px}
  .phone-title{font-size:16px}
  .phone-chapter{font-size:11px}
  .phone-text{font-size:11px}
  .hero-float{padding:6px 10px;font-size:11px}
  .hero-float-1{left:-6px}
  .hero-float-2{right:-6px}
  .hero-float-3{left:6px}

  .section-title{font-size:24px}
  .section-desc{font-size:14px}
  .head-center,.head-left{margin-bottom:32px}

  .entrance-grid{grid-template-columns:1fr;gap:12px}
  .entrance-card{padding:20px 18px}
  .entrance-card strong{font-size:17px}

  .app-grid{grid-template-columns:1fr;gap:14px}
  .app-card{padding:22px 20px}
  .app-icon{font-size:32px}
  .app-head h3{font-size:17px}
  .app-list li{font-size:13px}
  .security-row{grid-template-columns:repeat(2,1fr);gap:12px;padding:18px;margin-top:24px}
  .sec-icon{width:32px;height:32px;font-size:16px}

  .feature-grid{grid-template-columns:1fr;gap:14px}
  .feature-card{padding:22px 20px}
  .feature-num{font-size:36px}
  .feature-card h3{font-size:17px}

  .cat-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .cat-card{padding:20px 14px}
  .cat-emoji{font-size:36px;height:50px}
  .cat-card h3{font-size:16px}
  .cat-card p{font-size:11px}
  .cat-count{font-size:10px;padding:2px 6px}

  .timeline::before{left:18px}
  .tl-item{padding-left:50px}
  .tl-num{width:40px;height:40px;font-size:16px}
  .tl-body{padding:18px 18px}
  .tl-body h4{font-size:16px}
  .tl-body p{font-size:13px}

  .updates-grid{grid-template-columns:1fr;gap:12px}
  .update-card{padding:18px 16px}
  .update-card h4{font-size:15px}
  .update-card p{font-size:12.5px}

  .platform-scroll{padding:0}
  .platform-table th,.platform-table td{padding:10px 8px;font-size:13px}
  .platform-scroll-hint{font-size:11px;padding:4px 0 0}

  .faq-related{padding:16px 14px;margin-top:18px}
  .faq-related h3{font-size:13px}
  .faq-related ul li{font-size:12px;padding:4px 0;line-height:1.6}

  .tips-grid{grid-template-columns:1fr;gap:12px}
  .tip-card{padding:20px 18px}
  .tip-num{font-size:34px}
  .tip-card h4{font-size:15px}
  .tip-card p{font-size:13px}

  .tags-box{padding:16px;gap:6px}
  .tag-xl{font-size:14px !important;padding:7px 12px !important}
  .tag-lg{font-size:13px !important}
  .tag-md{font-size:12px !important}
  .tag-sm{font-size:11px !important}

  .reviews-grid{grid-template-columns:1fr;gap:12px}
  .review-card{padding:20px 18px}
  .review-card p{font-size:13px}

  .faq-list{grid-template-columns:1fr;gap:10px}
  .faq-item{padding:16px 18px}
  .faq-q{font-size:14px}
  .faq-a p{font-size:13px}

  .faq-related{padding:18px 16px;margin-top:20px}
  .faq-related h3{font-size:14px}
  .faq-related ul li{font-size:12.5px;padding:5px 0;line-height:1.6}

  .cta-final{padding:48px 0}
  .cta-box{padding:32px 24px;flex-direction:column;text-align:center}
  .cta-text{min-width:0}
  .cta-text h2{font-size:22px}
  .cta-text p{font-size:14px}

  .footer{padding:48px 0 24px}
  .foot-top{grid-template-columns:1fr;gap:24px;padding-bottom:24px}
  .foot-col h5{margin-bottom:10px;font-size:13px}
  .foot-col ul li{margin-bottom:6px}
  .foot-col ul li a{font-size:13px}
  .kw-list a{font-size:11px}

  .float-dl-inner{gap:10px}
  .float-info img{width:32px;height:32px}
  .float-text strong{font-size:13px}
  .float-text small{font-size:11px}
  .float-dl .btn-primary{padding:9px 16px;font-size:13px}

  .back-top{width:40px;height:40px;bottom:calc(var(--float-h) + 12px);right:14px}
}

/* ============================================
   响应式 · 断点3：381px - 480px（中手机）
   ============================================ */
@media (max-width:480px){
  :root{
    --nav-h:56px;
    --topbar-h:32px;
    --float-h:66px;
  }
  .container{padding:0 16px}
  .breadcrumb{padding:8px 0;font-size:11px}
  .breadcrumb ol{gap:5px}
  body{font-size:15px}
  .topbar{font-size:12px}
  .topbar-inner{padding:0 16px;gap:8px}
  .topbar-tag{font-size:10px;padding:2px 8px}
  .topbar-text{font-size:12px}

  .nav{padding:0 14px;gap:8px}
  .brand{gap:8px}
  .brand-mark{width:32px;height:32px}
  .brand-text strong{font-size:15px}
  .brand-text small{font-size:10px}
  .btn-download{padding:7px 12px}

  .hero{padding:24px 0 40px}
  .hero-inner{gap:24px}
  .hero-eyebrow{font-size:11px;padding:5px 10px;letter-spacing:2px}
  .hero-name{font-size:34px;letter-spacing:-1px}
  .hero-title{font-size:18px}
  .hero-desc{font-size:14px;line-height:1.7}
  .hero-cta{flex-direction:column;align-items:stretch;gap:8px}
  .btn-primary.big{padding:12px 20px;font-size:14px;text-align:center;justify-content:center}
  .btn-ghost{text-align:center;justify-content:center}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:14px;padding:16px 0}
  .stat-num{font-size:18px}
  .stat-label{font-size:11px}

  .phone-mockup{width:200px;height:380px;padding:10px}
  .phone-screen{padding:28px 12px 12px}
  .phone-bar{font-size:10px;margin-bottom:10px}
  .phone-title{font-size:15px}
  .phone-chapter{font-size:10px;margin-bottom:8px;padding-bottom:8px}
  .phone-text{font-size:11px;margin-bottom:8px}
  .hero-float{padding:5px 9px;font-size:10px}
  .hero-float-1{top:18%;left:-4px}
  .hero-float-2{top:48%;right:-4px}
  .hero-float-3{bottom:16%;left:4px}

  .section{padding:44px 0}
  .section-title{font-size:21px}
  .section-desc{font-size:13px}
  .eyebrow{font-size:11px;padding:3px 10px}
  .head-center,.head-left{margin-bottom:28px}

  .entrance-card{padding:18px 16px}
  .entrance-card strong{font-size:16px}
  .ent-desc{font-size:13px}
  .ent-arrow{top:18px;right:16px;font-size:18px}

  .app-card{padding:20px 18px}
  .app-icon{font-size:30px}
  .app-head h3{font-size:16px}
  .app-head small{font-size:12px}
  .app-list li{font-size:12.5px;padding-left:20px}
  .app-card .btn-primary{align-self:stretch;text-align:center;justify-content:center}
  .security-row{grid-template-columns:1fr 1fr;gap:10px;padding:14px;margin-top:20px}
  .security-item{gap:8px}
  .sec-icon{width:30px;height:30px;font-size:14px}
  .security-item strong{font-size:12px}
  .security-item small{font-size:11px}

  .feature-card{padding:20px 18px}
  .feature-num{font-size:32px}
  .feature-card h3{font-size:16px}
  .feature-card p{font-size:13px;line-height:1.6}
  .feature-tags li{font-size:11px;padding:2px 8px}

  .cat-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .cat-card{padding:16px 10px;border-radius:10px}
  .cat-emoji{font-size:30px;height:42px}
  .cat-card h3{font-size:14px}
  .cat-card p{font-size:10px;display:none}
  .cat-count{font-size:10px;padding:2px 6px}

  .timeline::before{left:16px}
  .tl-item{padding-left:46px;margin-bottom:20px}
  .tl-num{width:36px;height:36px;font-size:14px;left:0}
  .tl-body{padding:16px 16px}
  .tl-body h4{font-size:15px}
  .tl-body p{font-size:12.5px;line-height:1.6}

  .updates-grid{grid-template-columns:1fr;gap:10px}
  .update-card{padding:16px 14px}
  .update-tag{font-size:10px;padding:2px 8px}
  .update-card h4{font-size:14px}
  .update-card p{font-size:12px;line-height:1.6}
  .update-card small{font-size:11px}

  .platform-table th,.platform-table td{padding:8px 6px;font-size:12px}

  .tip-card{padding:18px 16px}
  .tip-num{font-size:30px}
  .tip-card h4{font-size:14px}
  .tip-card p{font-size:12.5px;line-height:1.6}
  .tip-card code{font-size:11px;padding:1px 5px}

  .tags-box{padding:12px;gap:5px}
  .tag-xl{font-size:13px !important;padding:6px 10px !important}
  .tag-lg{font-size:12px !important;padding:5px 10px !important}
  .tag-md{font-size:11.5px !important;padding:5px 9px !important}
  .tag-sm{font-size:11px !important;padding:4px 8px !important}

  .review-card{padding:18px 16px}
  .review-stars{font-size:16px}
  .review-card p{font-size:12.5px;line-height:1.7}
  .review-author strong{font-size:13px}
  .review-author small{font-size:11px}

  .faq-item{padding:14px 16px}
  .faq-q{font-size:13.5px}
  .faq-a{margin-top:10px;padding-top:10px}
  .faq-a p{font-size:12.5px;line-height:1.7}
  .faq-q::after{font-size:18px}

  .cta-final{padding:40px 0}
  .cta-box{padding:28px 20px;border-radius:16px}
  .cta-text h2{font-size:20px}
  .cta-text p{font-size:13px}
  .cta-box .btn-primary{padding:14px 22px;font-size:14px}

  .footer{padding:40px 0 20px}
  .foot-top{gap:20px;padding-bottom:20px}
  .foot-brand{gap:8px}
  .foot-desc{font-size:13px}
  .foot-tip{font-size:12px}
  .foot-col h5{font-size:12px;margin-bottom:8px}
  .foot-col ul li{margin-bottom:5px}
  .foot-col ul li a{font-size:12.5px}
  .kw-list a{font-size:11px;padding:3px 8px}
  .foot-bottom{padding-top:18px;font-size:12px}
  .foot-bottom p{margin-bottom:4px}

  .float-dl{padding:10px 14px}
  .float-dl-inner{gap:8px}
  .float-info img{width:30px;height:30px}
  .float-text strong{font-size:12.5px}
  .float-text small{font-size:10.5px}
  .float-dl .btn-primary{padding:8px 14px;font-size:12.5px}

  .back-top{width:38px;height:38px;bottom:calc(var(--float-h) + 10px);right:12px}
}

/* ============================================
   响应式 · 断点4：341px - 380px（小手机）
   ============================================ */
@media (max-width:380px){
  .container{padding:0 14px}
  .topbar-inner{padding:0 14px}
  .nav{padding:0 12px}
  .breadcrumb{padding:6px 0;font-size:10.5px}
  .platform-scroll-hint{font-size:10px}
  .faq-related{padding:14px 12px;margin-top:14px}
  .faq-related h3{font-size:12px}
  .faq-related ul li{font-size:11.5px;line-height:1.5}
  .brand{gap:6px}
  .brand-mark{width:30px;height:30px}
  .brand-text strong{font-size:14px}
  .brand-text small{display:none}

  .hero-name{font-size:30px}
  .hero-title{font-size:16px}
  .hero-desc{font-size:13px}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:10px;padding:14px 0}
  .stat-num{font-size:16px}
  .stat-label{font-size:10px}

  .phone-mockup{width:180px;height:360px}
  .phone-screen{padding:26px 10px 10px}
  .phone-title{font-size:14px}
  .phone-text{font-size:10.5px}

  .section-title{font-size:19px}
  .section-desc{font-size:12.5px}

  .cat-grid{grid-template-columns:1fr 1fr;gap:8px}
  .cat-card{padding:14px 8px}
  .cat-emoji{font-size:26px;height:36px}
  .cat-card h3{font-size:13px}

  .tags-box{padding:10px;gap:4px}
  .tag-xl{font-size:12px !important;padding:5px 9px !important}
  .tag-lg{font-size:11.5px !important;padding:4px 8px !important}
  .tag-md{font-size:11px !important;padding:4px 7px !important}
  .tag-sm{font-size:10.5px !important;padding:3px 7px !important}

  .faq-q{font-size:13px}
  .faq-a p{font-size:12px}

  .cta-text h2{font-size:18px}

  .float-text small{display:none}
}

/* ============================================
   响应式 · 断点5：≤340px（超小屏）
   ============================================ */
@media (max-width:340px){
  :root{
    --nav-h:52px;
    --topbar-h:30px;
    --float-h:62px;
  }
  body{font-size:14px}
  .container{padding:0 12px}
  .topbar-inner{padding:0 12px;gap:6px}
  .breadcrumb{padding:5px 0;font-size:10px}
  .breadcrumb ol{gap:4px}
  .platform-scroll-hint{font-size:9.5px;padding:3px 0 0}
  .faq-related{padding:12px 10px;margin-top:12px}
  .faq-related ul li{font-size:11px;line-height:1.5}
  .topbar-tag{font-size:9px;padding:2px 6px;letter-spacing:0.5px}
  .topbar-text{font-size:11px}

  .nav{padding:0 10px;gap:6px}
  .brand-mark{width:28px;height:28px}
  .brand-text strong{font-size:13px}
  .btn-download{padding:6px 10px}
  .btn-download svg{width:16px;height:16px}

  .hero{padding:20px 0 32px}
  .hero-eyebrow{font-size:10px;padding:4px 8px;letter-spacing:1px}
  .hero-name{font-size:26px;letter-spacing:-0.5px}
  .hero-title{font-size:15px}
  .hero-desc{font-size:12.5px}
  .btn-primary.big{padding:11px 18px;font-size:13px}
  .btn-ghost{padding:9px 16px;font-size:13px}
  .hero-stats{grid-template-columns:1fr 1fr;gap:8px;padding:12px 0}
  .stat-num{font-size:14px}
  .stat-label{font-size:10px}

  .phone-mockup{width:170px;height:340px;padding:8px}
  .phone-screen{padding:24px 10px 10px}
  .phone-bar{font-size:9px}
  .phone-title{font-size:13px}
  .phone-chapter{font-size:9px}
  .phone-text{font-size:10px}
  .hero-float{padding:4px 7px;font-size:9px}
  .hero-float-1{top:15%;left:-2px}
  .hero-float-2{top:45%;right:-2px}
  .hero-float-3{bottom:14%;left:2px}

  .section{padding:36px 0}
  .section-title{font-size:17px}
  .section-desc{font-size:12px}
  .eyebrow{font-size:10px;padding:2px 8px}
  .head-center,.head-left{margin-bottom:22px}

  .entrance-card{padding:16px 14px}
  .entrance-card strong{font-size:14px}
  .ent-desc{font-size:12px}
  .ent-tag{font-size:10px;padding:2px 8px}
  .ent-arrow{font-size:16px}

  .app-card{padding:18px 14px}
  .app-icon{font-size:26px}
  .app-head h3{font-size:15px}
  .app-head small{font-size:11px}
  .app-list li{font-size:12px;padding-left:18px}
  .security-row{grid-template-columns:1fr;gap:8px;padding:12px;margin-top:16px}
  .security-item{justify-content:center}

  .feature-card{padding:18px 14px}
  .feature-num{font-size:28px}
  .feature-card h3{font-size:15px}
  .feature-card p{font-size:12px;line-height:1.6}

  .cat-grid{grid-template-columns:1fr 1fr;gap:6px}
  .cat-card{padding:12px 6px;border-radius:8px}
  .cat-emoji{font-size:22px;height:30px}
  .cat-card h3{font-size:12px}
  .cat-count{font-size:9px;padding:2px 5px}

  .timeline::before{left:14px}
  .tl-item{padding-left:42px;margin-bottom:16px}
  .tl-num{width:32px;height:32px;font-size:12px}
  .tl-body{padding:14px 14px}
  .tl-body h4{font-size:14px}
  .tl-body p{font-size:11.5px;line-height:1.6}

  .update-card{padding:14px 12px}
  .update-tag{font-size:9px;padding:2px 6px}
  .update-card h4{font-size:13px}
  .update-card p{font-size:11px;line-height:1.6}

  .platform-table th,.platform-table td{padding:6px 4px;font-size:11px}

  .tip-card{padding:16px 12px}
  .tip-num{font-size:26px}
  .tip-card h4{font-size:13px}
  .tip-card p{font-size:11.5px;line-height:1.5}
  .tip-card code{font-size:10px;padding:1px 4px}

  .tags-box{padding:8px;gap:3px}
  .tag-xl{font-size:11px !important;padding:4px 8px !important;min-height:28px}
  .tag-lg{font-size:11px !important;padding:3px 7px !important;min-height:26px}
  .tag-md{font-size:10.5px !important;padding:3px 6px !important;min-height:24px}
  .tag-sm{font-size:10px !important;padding:2px 6px !important;min-height:22px}

  .review-card{padding:16px 14px}
  .review-stars{font-size:14px}
  .review-card p{font-size:12px;line-height:1.6}
  .review-author strong{font-size:12px}
  .review-author small{font-size:10px}

  .faq-item{padding:12px 14px}
  .faq-q{font-size:12.5px}
  .faq-q::after{font-size:16px}
  .faq-a p{font-size:11.5px;line-height:1.6}

  .cta-final{padding:32px 0}
  .cta-box{padding:24px 16px;border-radius:14px}
  .cta-text h2{font-size:17px}
  .cta-text p{font-size:12px}
  .cta-box .btn-primary{padding:12px 18px;font-size:13px}

  .footer{padding:32px 0 16px}
  .foot-desc{font-size:12px}
  .foot-tip{font-size:11px}
  .foot-col h5{font-size:11px}
  .foot-col ul li a{font-size:12px}
  .kw-list a{font-size:10px;padding:3px 6px}
  .foot-bottom{font-size:11px;padding-top:14px}

  .float-dl{padding:8px 12px}
  .float-info img{width:28px;height:28px}
  .float-text strong{font-size:12px}
  .float-text small{display:none}
  .float-dl .btn-primary{padding:7px 12px;font-size:12px}

  .back-top{width:36px;height:36px;bottom:calc(var(--float-h) + 8px);right:10px}
}

/* ===== 横屏适配 ===== */
@media (max-width:896px) and (orientation:landscape){
  .hero{padding:32px 0 40px}
  .hero-inner{grid-template-columns:1.1fr 1fr;gap:32px}
  .phone-mockup{width:200px;height:340px}
  .hero-float{display:none}
}

/* ===== 打印样式 ===== */
@media print{
  .topbar,.header,.float-dl,.back-top,.menu-btn,.mobile-drawer,.drawer-backdrop,.hero-scroll{display:none}
  body{padding-top:0;padding-bottom:0}
  .section{padding:24px 0;page-break-inside:avoid}
  a{color:#000;text-decoration:underline}
}

/* ===== 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,.cat-card,
.update-card,.tags-box,.topbar-tag,
.platform-card,.platform-logo,.tip-card,.tip-card code,.platform-summary{
  -webkit-tap-highlight-color:transparent;
  touch-action:manipulation;
}

/* ===== 防溢出 ===== */
.hero-grid,.entrance-grid,.app-grid,.feature-grid,.cat-grid,
.updates-grid,.reviews-grid,.faq-list,.cta-box,
.footer-inner,.float-dl-inner,.tags-box,.timeline,.phone-mockup,
.topbar-inner,.platform-grid,.platform-card,.platform-summary,
.tips-grid,.tip-card{
  overflow-x:hidden;
  max-width:100%;
}

/* 焦点可见性 */
a:focus-visible,button:focus-visible,.faq-q:focus-visible{
  outline:2px solid var(--c-red);
  outline-offset:2px;
}

/* 减少动画偏好 */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:0.01ms !important;
    transition-duration:0.01ms !important;
  }
  html{scroll-behavior:auto}
}