/* ===== 变量 ===== */
:root{
  --primary:#ff7a1a;
  --primary-dark:#ef6a08;
  --primary-light:#fff3e6;
  --dark:#1d2330;
  --text:#3a4252;
  --muted:#7b8296;
  --bg:#ffffff;
  --bg-light:#f6f7fb;
  --border:#e9ebf2;
  --radius:16px;
  --shadow:0 12px 32px rgba(29,35,48,.10);
  --shadow-sm:0 6px 18px rgba(29,35,48,.06);
}

/* ===== 基础 ===== */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== 通用按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;font-weight:600;cursor:pointer;border:none;transition:transform .3s,background .3s,box-shadow .3s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 10px 24px rgba(255,122,26,.35)}
.btn-dark{background:var(--dark);color:#fff}
.btn-dark:hover{background:#2a3142;transform:translateY(-2px);box-shadow:0 10px 24px rgba(29,35,48,.28)}
.btn-lg{padding:16px 34px;font-size:17px}

/* ===== 导航栏 ===== */
.navbar{position:fixed;top:0;left:0;right:0;z-index:999;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid transparent;transition:border-color .3s,box-shadow .3s}
.navbar.scrolled{border-color:var(--border);box-shadow:0 4px 20px rgba(29,35,48,.06)}
.nav-inner{height:64px;display:flex;align-items:center;gap:20px}
.logo{font-size:22px;font-weight:800;color:var(--primary);white-space:nowrap}
.nav-menu{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-menu a{padding:8px 11px;font-size:15px;color:var(--text);border-radius:8px;transition:color .2s,background .2s;white-space:nowrap}
.nav-menu a:hover{color:var(--primary);background:var(--primary-light)}
.nav-download{padding:8px 18px;font-size:14px;margin-left:8px}

/* ===== Hero ===== */
.hero{padding:140px 0 90px;background:linear-gradient(180deg,#fff 0%,#fff6ec 100%)}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.hero-text h1{font-size:44px;line-height:1.25;color:var(--dark);font-weight:800;margin-bottom:20px}
.hero-desc{font-size:16px;color:var(--text);line-height:1.9;margin-bottom:32px;max-width:560px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-img img{width:100%;border-radius:24px;border:1px solid var(--border);box-shadow:var(--shadow)}

/* ===== 通用区块 ===== */
.section{padding:80px 0}
.section-alt{background:var(--bg-light)}
.sec-head{text-align:center;margin-bottom:48px}
.sec-head h2{font-size:32px;color:var(--dark);font-weight:800;margin-bottom:10px}
.sec-head p{color:var(--muted);font-size:15px}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);transition:transform .3s,box-shadow .3s}

/* ===== 作品预览 ===== */
.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.work-card{overflow:hidden}
.work-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.work-card img{width:100%;aspect-ratio:3/4;object-fit:cover;transition:transform .4s}
.work-card:hover img{transform:scale(1.04)}
.work-info{padding:16px 18px}
.work-info h3{font-size:17px;color:var(--dark);margin-bottom:4px}
.work-info p{font-size:13px;color:var(--muted)}

/* ===== 产品介绍 ===== */
.intro-box{max-width:860px;margin:0 auto;text-align:center}
.intro-box>p{font-size:16px;color:var(--text);line-height:2;margin-bottom:16px}
.intro-points{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}
.point{background:var(--bg-light);border:1px solid var(--border);border-radius:var(--radius);padding:24px 20px;transition:transform .3s,box-shadow .3s}
.point:hover{transform:translateY(-6px);box-shadow:var(--shadow-sm)}
.point b{display:block;font-size:18px;color:var(--dark);margin-bottom:6px}
.point span{font-size:14px;color:var(--muted)}

/* ===== 核心功能 ===== */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feat-card{padding:30px 26px}
.feat-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.feat-ico{width:54px;height:54px;border-radius:14px;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.feat-ico svg{width:28px;height:28px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.feat-card h3{font-size:18px;color:var(--dark);margin-bottom:10px}
.feat-card p{font-size:14px;color:var(--text);line-height:1.8}

/* ===== 优势对比 ===== */
.compare-box{max-width:900px;margin:0 auto;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#fff}
.compare-row{display:grid;grid-template-columns:1.1fr 1fr 1fr}
.compare-row>div{padding:16px 20px;font-size:15px}
.compare-head{background:var(--dark);font-weight:700;color:#fff}
.compare-head .c-us{color:#ffe3c4;background:transparent}
.compare-head .c-them{color:#b9c0cf;background:transparent}
.compare-row:not(.compare-head){border-top:1px solid var(--border)}
.compare-row:not(.compare-head) .c-item{font-weight:600;color:var(--dark)}
.c-us{background:var(--primary);color:#fff;font-weight:700}
.c-them{background:#f2f3f7;color:var(--muted)}

/* ===== 平台数据 ===== */
.section-data{background:linear-gradient(135deg,#ff7a1a 0%,#ffb057 100%)}
.section-data .sec-head h2{color:#fff}
.section-data .sec-head p{color:rgba(255,255,255,.85)}
.data-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:24px}
.data-item{text-align:center;padding:26px 16px;border-radius:var(--radius);background:rgba(255,255,255,.14);backdrop-filter:blur(4px);transition:transform .3s,background .3s}
.data-item:hover{transform:translateY(-6px);background:rgba(255,255,255,.22)}
.data-item b{display:block;font-size:38px;font-weight:800;color:#fff;line-height:1.2;margin-bottom:6px}
.data-item span{font-size:14px;color:rgba(255,255,255,.92)}

/* ===== 用户评价 ===== */
.rev-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.rev-card{padding:24px}
.rev-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.rev-top{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.rev-avatar{width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;color:#fff;background:var(--primary);flex-shrink:0}
.rev-card:nth-child(3n+2) .rev-avatar{background:#e85d75}
.rev-card:nth-child(3n+3) .rev-avatar{background:#00b8a9}
.rev-meta h4{font-size:16px;color:var(--dark)}
.stars{color:#ffb400;font-size:14px;letter-spacing:2px}
.rev-text{font-size:14px;color:var(--text);line-height:1.8}

/* ===== 版本更新 ===== */
.update-card{max-width:820px;margin:0 auto;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:32px}
.update-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding-bottom:20px;border-bottom:1px solid var(--border);margin-bottom:20px}
.update-title h3{font-size:22px;color:var(--dark);margin-bottom:6px}
.update-date{font-size:13px;color:var(--muted)}
.update-badge{flex-shrink:0;font-size:13px;color:var(--primary);background:var(--primary-light);border:1px solid #ffe3c4;padding:6px 14px;border-radius:999px;font-weight:600}
.update-log li{position:relative;padding:9px 0 9px 28px;font-size:15px;color:var(--text)}
.update-log li::before{content:"";position:absolute;left:6px;top:16px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

/* ===== FAQ ===== */
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq-item{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:border-color .3s,box-shadow .3s}
.faq-item.open{border-color:var(--primary);box-shadow:var(--shadow-sm)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 22px;background:none;border:none;font-size:16px;font-weight:600;color:var(--dark);cursor:pointer;text-align:left}
.faq-ico{width:22px;height:22px;position:relative;flex-shrink:0}
.faq-ico::before,.faq-ico::after{content:"";position:absolute;background:var(--primary);border-radius:2px;transition:transform .3s}
.faq-ico::before{left:3px;right:3px;top:10px;height:2px}
.faq-ico::after{top:3px;bottom:3px;left:10px;width:2px}
.faq-item.open .faq-ico::after{transform:scaleY(0)}
.faq-panel{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-item.open .faq-panel{max-height:400px}
.faq-panel p{padding:0 22px 20px;font-size:14px;color:var(--text);line-height:1.9}

/* ===== 下载区域 ===== */
.section-download{background:linear-gradient(180deg,#fff 0%,#fff6ec 100%)}
.download-box{max-width:720px;margin:0 auto;text-align:center}
.download-box h1{font-size:36px;color:var(--dark);font-weight:800;margin-bottom:14px}
.dl-meta{font-size:14px;color:var(--muted);margin-bottom:30px}
.dl-btns{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;margin-bottom:26px}
.dl-tip{font-size:13px;color:var(--muted)}

/* ===== 页脚 ===== */
.footer{background:var(--dark);padding:30px 0;text-align:center}
.footer p{color:#aeb4c2;font-size:14px}
.footer a{color:#fff;transition:color .3s}
.footer a:hover{color:var(--primary)}

/* ===== 返回顶部 ===== */
.back-top{position:fixed;right:24px;bottom:28px;width:46px;height:46px;border-radius:50%;background:var(--primary);color:#fff;border:none;font-size:20px;cursor:pointer;box-shadow:var(--shadow-sm);opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,transform .3s,background .3s;z-index:998}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{background:var(--primary-dark)}

/* ===== 平板 ===== */
@media(max-width:1024px){
  .hero-inner{gap:40px}
  .hero-text h1{font-size:36px}
  .works-grid,.feat-grid,.rev-grid{grid-template-columns:repeat(2,1fr)}
  .data-grid{grid-template-columns:repeat(3,1fr)}
  .nav-menu a{padding:8px 8px;font-size:14px}
}

/* ===== 手机 ===== */
@media(max-width:768px){
  .container{padding:0 20px}
  .nav-menu{display:none}
  .nav-download{margin-left:auto}
  .hero{padding:110px 0 60px}
  .hero-inner{grid-template-columns:1fr;gap:28px}
  .hero-text h1{font-size:30px}
  .hero-desc{font-size:15px}
  .hero-btns{flex-direction:column}
  .hero-btns .btn,.dl-btns .btn{width:100%}
  .section{padding:56px 0}
  .sec-head{margin-bottom:32px}
  .sec-head h2{font-size:26px}
  .works-grid,.feat-grid,.rev-grid,.intro-points{grid-template-columns:1fr}
  .data-grid{grid-template-columns:repeat(2,1fr)}
  .data-item b{font-size:30px}
  .compare-head{display:none}
  .compare-box{border:none;background:none;overflow:visible}
  .compare-row{grid-template-columns:1fr 1fr;grid-template-areas:"item item" "us them";gap:10px;padding:14px;border:1px solid var(--border);border-radius:var(--radius);background:#fff;margin-bottom:12px}
  .compare-row>div{padding:10px 14px;border-radius:10px}
  .c-item{grid-area:item}
  .c-us{grid-area:us}
  .c-them{grid-area:them}
  .c-us::before,.c-them::before{display:block;font-size:12px;font-weight:600;margin-bottom:4px}
  .c-us::before{content:"韩国漫画免费版";color:#fff}
  .c-them::before{content:"其他漫画平台";color:var(--muted)}
  .update-card{padding:24px 20px}
  .update-head{flex-direction:column}
  .update-title h3{font-size:19px}
  .download-box h1{font-size:28px}
  .dl-meta{font-size:12px;white-space:nowrap;margin-bottom:24px}
  .dl-btns{flex-direction:column}
  .back-top{right:16px;bottom:20px;width:42px;height:42px}
}