/* ==========================================================================
   ao3 内容专题站 · 共享样式表
   配色：墨蓝（品牌）+ 陶土橙（强调）+ 米纸底（阅读调性）
   ========================================================================== */

:root{
  --ink:#1f2b38;
  --ink-soft:#5d6d7c;
  --muted:#8b98a5;
  --brand:#2b4b6f;
  --brand-deep:#1d3550;
  --brand-2:#4f8dab;
  --accent:#c9683f;
  --accent-deep:#ab5430;
  --gold:#d6a03e;
  --paper:#faf6ef;
  --card:#ffffff;
  --line:#e7dfd3;
  --soft:#eef2f7;
  --ok:#3f8f6d;
  --radius:18px;
  --shadow:0 10px 30px rgba(31,43,56,.07);
  --shadow-lg:0 18px 44px rgba(31,43,56,.12);
  --wrap:1140px;
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;
  line-height:1.78;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%;height:auto;display:block;border:0}

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

h1,h2,h3,h4{margin:0 0 .6em;line-height:1.35;font-weight:700;color:var(--ink)}
p{margin:0 0 1em}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}

.skip{position:absolute;left:-9999px}

/* ---------------- 顶部导航 ---------------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(250,246,239,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;align-items:center;gap:18px;
  min-height:74px;
}
.brand{display:flex;align-items:center;gap:10px;flex:none;text-decoration:none}
.brand img{width:44px;height:44px;border-radius:12px}
.brand-name{display:flex;flex-direction:column;line-height:1.15}
.brand-name b{font-size:24px;letter-spacing:.5px;color:var(--brand)}
.brand-name .sub{font-size:12px;color:var(--muted);letter-spacing:.4px}

.nav{display:flex;align-items:center;gap:2px;margin-left:auto;flex-wrap:wrap}
.nav a{
  display:inline-block;padding:8px 14px;border-radius:10px;
  color:var(--ink-soft);font-size:15px;
}
.nav a:hover{color:var(--brand);background:var(--soft)}
.nav a.is-active{color:var(--brand);font-weight:700;background:var(--soft)}
.nav a.header-cta{
  background:linear-gradient(135deg,var(--accent),var(--accent-deep));
  color:#fff;font-weight:700;margin-left:10px;
  box-shadow:0 6px 16px rgba(201,104,63,.28);
}
.nav a.header-cta:hover{color:#fff;filter:brightness(1.06)}

/* ---------------- 按钮 ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 28px;border-radius:999px;
  font-size:16px;font-weight:700;line-height:1;
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,filter .18s ease;
}
.btn-primary{
  background:linear-gradient(135deg,var(--accent),var(--accent-deep));
  color:#fff;box-shadow:0 10px 24px rgba(201,104,63,.3);
}
.btn-primary:hover{color:#fff;transform:translateY(-2px);filter:brightness(1.05)}
.btn-ghost{
  background:rgba(43,75,111,.06);color:var(--brand);border-color:rgba(43,75,111,.16);
}
.btn-ghost:hover{color:var(--brand);background:rgba(43,75,111,.1);transform:translateY(-2px)}
.btn-lg{padding:17px 40px;font-size:17px}
.btn-sm{padding:10px 20px;font-size:14px}

/* ---------------- 通用区块 ---------------- */
.section{padding:70px 0}
.section--tight{padding:46px 0}
.section--alt{background:#fff}
.section-head{max-width:760px;margin:0 auto 40px;text-align:center}
.eyebrow{
  display:inline-block;font-size:13px;font-weight:700;letter-spacing:2px;
  color:var(--accent);text-transform:uppercase;margin-bottom:12px;
}
.section-head h2{font-size:31px;margin-bottom:12px}
.section-head p{color:var(--ink-soft);margin:0;font-size:16px}
.lead{font-size:17px;color:var(--ink-soft)}

/* ---------------- Hero ---------------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(920px 460px at 88% -8%,rgba(79,141,171,.16),transparent 62%),
    radial-gradient(680px 380px at 4% 104%,rgba(201,104,63,.13),transparent 66%),
    var(--paper);
  padding:60px 0 66px;
}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:48px;align-items:center}
.hero-grid>*{min-width:0}
.hero h1{
  font-size:46px;letter-spacing:1px;margin:0 0 18px;
  color:var(--brand-deep);
}
.hero h1 .hl{color:var(--accent)}
.hero .tagline{font-size:17px;color:var(--ink-soft);margin:0 0 14px;max-width:560px}
.hero .desc{font-size:15.5px;color:var(--muted);margin:0 0 26px;max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin-bottom:14px}
.hero-note{font-size:13.5px;color:var(--muted);display:flex;align-items:center;gap:8px}
.dot{width:7px;height:7px;border-radius:50%;background:var(--ok);flex:none}

.hero-visual{display:flex;justify-content:center;align-items:center;gap:18px;flex-wrap:wrap}
.phone{
  width:210px;flex:none;background:#fff;border:1px solid var(--line);
  border-radius:26px;overflow:hidden;box-shadow:var(--shadow-lg);
}
.phone img{width:100%;height:auto}
.phone.small{width:152px;border-radius:22px}

/* ---------------- 数据信任条 ---------------- */
.stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
  margin-top:44px;
}
.stat{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 20px;text-align:center;box-shadow:var(--shadow);
}
.stat b{display:block;font-size:29px;color:var(--brand);line-height:1.2}
.stat span{font-size:13.5px;color:var(--muted)}

/* ---------------- 卡片网格 ---------------- */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;box-shadow:var(--shadow);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#ded3c2}
.card h3{font-size:19px;margin-bottom:10px}
.card p{margin:0;color:var(--ink-soft);font-size:15px}
.card .ico{
  width:46px;height:46px;border-radius:13px;margin-bottom:16px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,rgba(43,75,111,.12),rgba(79,141,171,.16));
}
.card .ico svg{width:24px;height:24px;stroke:var(--brand);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* 入口卡 */
.entry{display:flex;flex-direction:column;height:100%}
.entry .card-body{display:flex;flex-direction:column;flex:1}
.entry .more{color:var(--accent);font-weight:700;font-size:14.5px;margin-top:16px}
.entry:hover .more{color:var(--accent-deep)}
.tagline-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.pill{
  font-size:12.5px;padding:5px 12px;border-radius:999px;
  background:var(--soft);color:var(--brand);font-weight:700;
}

/* ---------------- 截图 gallery ---------------- */
.shots{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.shot{
  margin:0;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);padding:12px;box-shadow:var(--shadow);
}
.shot img{width:100%;height:auto;border-radius:12px}
.shot figcaption{text-align:center;font-size:14px;color:var(--ink-soft);margin-top:12px;font-weight:700}

/* ---------------- 评价 ---------------- */
.reviews{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.review{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);
}
.review .who{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.avatar{
  width:42px;height:42px;border-radius:50%;flex:none;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#fff;font-weight:700;font-size:17px;
}
.who b{display:block;font-size:15px}
.who span{font-size:12.5px;color:var(--muted)}
.review p{margin:0;font-size:15px;color:var(--ink-soft)}
.stars{color:var(--gold);font-size:14px;letter-spacing:2px;margin-bottom:10px}

/* ---------------- FAQ ---------------- */
.faq-list{max-width:900px;margin:0 auto}
details.qa{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:0 22px;margin-bottom:14px;box-shadow:var(--shadow);
}
details.qa summary{
  cursor:pointer;list-style:none;padding:20px 0;
  font-weight:700;font-size:16.5px;color:var(--ink);
  display:flex;align-items:flex-start;gap:12px;
}
details.qa summary::-webkit-details-marker{display:none}
details.qa summary .n{
  flex:none;width:26px;height:26px;border-radius:8px;margin-top:2px;
  background:rgba(43,75,111,.09);color:var(--brand);
  font-size:13px;display:flex;align-items:center;justify-content:center;
}
details.qa[open] summary{color:var(--brand)}
details.qa .ans{padding:0 0 22px 38px;color:var(--ink-soft);font-size:15px}
details.qa .ans p:last-child{margin-bottom:0}

/* ---------------- 下载条 ---------------- */
.cta-band{
  border-radius:26px;padding:48px 40px;text-align:center;
  background:linear-gradient(135deg,#24415f,#2b4b6f 46%,#3f7d92);
  color:#fff;box-shadow:var(--shadow-lg);
}
.cta-band h2{color:#fff;font-size:28px;margin-bottom:12px}
.cta-band p{color:rgba(255,255,255,.82);max-width:640px;margin:0 auto 26px;font-size:15.5px}
.cta-band .btn-ghost{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.3)}
.cta-band .btn-ghost:hover{color:#fff;background:rgba(255,255,255,.22)}
.cta-meta{margin-top:20px;font-size:13.5px;color:rgba(255,255,255,.7)}

/* ---------------- 内页文章 ---------------- */
.page-head{
  background:linear-gradient(135deg,rgba(43,75,111,.08),rgba(79,141,171,.1));
  border-bottom:1px solid var(--line);
  padding:48px 0 42px;
}
.crumb{font-size:13.5px;color:var(--muted);margin-bottom:12px}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--accent)}
.page-head h1{font-size:34px;margin:0 0 14px;color:var(--brand-deep)}
.page-head p{margin:0;color:var(--ink-soft);max-width:800px;font-size:16px}

.prose{max-width:840px}
.prose h2{
  font-size:25px;margin:44px 0 16px;padding-left:14px;
  border-left:4px solid var(--accent);
}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:19px;margin:28px 0 10px}
.prose p,.prose li{color:var(--ink-soft);font-size:16px}
.prose ul,.prose ol{padding-left:22px;margin:0 0 1.2em}
.prose li{margin-bottom:.5em}
.prose strong{color:var(--ink)}
.prose a{color:var(--accent);font-weight:700;border-bottom:1px solid rgba(201,104,63,.35)}
.prose a:hover{color:var(--accent-deep)}
.note{
  background:var(--soft);border-left:4px solid var(--brand-2);
  border-radius:0 14px 14px 0;padding:18px 22px;margin:22px 0;
}
.note p{margin:0;font-size:15px;color:var(--brand-deep)}

/* 侧栏布局 */
.split{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:44px;align-items:start}
.side{position:sticky;top:100px}
.side .box{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow);margin-bottom:20px;
}
.side .box h4{font-size:16px;margin-bottom:14px}
.side .box ul{list-style:none;margin:0;padding:0}
.side .box li{margin-bottom:10px;font-size:14.5px}
.side .box li a{color:var(--ink-soft)}
.side .box li a:hover{color:var(--accent)}

/* 步骤 */
.steps{counter-reset:s;list-style:none;padding:0;margin:0}
.steps li{
  position:relative;padding:0 0 26px 56px;counter-increment:s;
  border-left:2px solid var(--line);margin-left:16px;
}
.steps li:last-child{border-left-color:transparent;padding-bottom:0}
.steps li::before{
  content:counter(s);
  position:absolute;left:-17px;top:0;
  width:32px;height:32px;border-radius:50%;
  background:var(--brand);color:#fff;font-size:14px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.steps li b{display:block;font-size:17px;margin-bottom:6px}
.steps li p{margin:0;font-size:15px;color:var(--ink-soft)}

/* 功能块 */
.feat{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:36px;align-items:center;padding:38px 0;border-bottom:1px dashed var(--line)}
.feat:last-child{border-bottom:0}
.feat.flip{grid-template-columns:260px minmax(0,1fr)}
.feat.flip .feat-text{order:2}
.feat.flip .feat-media{order:1}
.feat-text h3{font-size:22px;margin-bottom:12px}
.feat-text .sc{margin-bottom:14px}
.feat-text .sc b{color:var(--brand)}
.feat-media{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:10px;box-shadow:var(--shadow)}
.feat-media img{width:100%;height:auto;border-radius:12px}

/* ---------------- 页脚 ---------------- */
.site-footer{
  background:#1b2c3d;color:#b9c6d2;margin-top:70px;
  padding:56px 0 28px;font-size:14.5px;
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px}
.site-footer h4{color:#fff;font-size:16px;margin-bottom:16px}
.site-footer p{color:#9fb0be;margin:0;font-size:14px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand img{width:40px;height:40px;border-radius:11px}
.footer-brand b{color:#fff;font-size:21px;letter-spacing:.5px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:11px}
.site-footer a{color:#b9c6d2}
.site-footer a:hover{color:#fff}
.disclaimer{
  margin-top:36px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);
  font-size:13.5px;color:#93a5b4;
}
.copy{margin-top:14px;font-size:13px;color:#7f919f}

/* ---------------- 渐显 ---------------- */
.reveal{transition:opacity .6s ease,transform .6s ease}
html.js .reveal{opacity:0;transform:translateY(18px)}
html.js .reveal.is-in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  .reveal,.js .reveal,html.js .reveal,html.js .reveal.is-in{opacity:1 !important;transform:none !important;transition:none !important}
}

/* ---------------- 响应式 ---------------- */
@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero h1{font-size:38px}
  .hero-visual{order:2}
  .phone{width:46vw;max-width:210px}
  .phone.small{width:32vw;max-width:152px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .shots{grid-template-columns:repeat(2,1fr)}
  .split{grid-template-columns:1fr;gap:34px}
  .side{position:static}
  .feat,.feat.flip{grid-template-columns:1fr;gap:22px}
  .feat.flip .feat-text,.feat.flip .feat-media{order:0}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .section{padding:56px 0}
}

@media (max-width:620px){
  .wrap{padding:0 18px}
  .section{padding:44px 0}
  .header-inner{flex-wrap:wrap;min-height:0;padding-top:7px;padding-bottom:7px;gap:5px}
  .brand{width:100%}
  .brand-name b{font-size:22px}
  .brand-name .sub{display:none}
  .nav{width:100%;margin-left:0;justify-content:space-between;gap:0}
  .nav a{padding:8px 6px;font-size:14px}
  .nav a.header-cta{display:none}
  .hero{padding:36px 0 46px}
  .hero h1{font-size:31px}
  .hero .tagline{font-size:16px}
  .hero-actions{gap:10px}
  .btn-lg{padding:15px 28px;font-size:16px;width:100%}
  .hero-actions .btn{width:100%}
  .stats{grid-template-columns:repeat(2,1fr);gap:14px;margin-top:32px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .shots{grid-template-columns:1fr;gap:18px}
  .reviews{grid-template-columns:1fr}
  .section-head h2{font-size:25px}
  .cta-band{padding:34px 22px;border-radius:20px}
  .cta-band h2{font-size:23px}
  .cta-band .btn{width:100%}
  .page-head{padding:34px 0 30px}
  .page-head h1{font-size:26px}
  .prose h2{font-size:21px}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .review{padding:20px}
  .card{padding:22px 20px}
}