/* =========================================================
   Typefree 官网样板 · 共用样式
   颜色只有两种「亮色」，并且和 App 里的含义一致：
   绿 = 录音已锁定，蓝 = 问 AI。其余全部是墨色和灰。
   字体：口语用无衬线（灰、轻），成稿用宋体（墨、重）。
   ========================================================= */
:root{
  --paper:#FBFBFC; --mist:#F1F1F3; --mist2:#E6E6E9; --card:#FFFFFF;
  --ink:#111113; --ink2:#3A3A3D; --lead:#6E6E73; --faint:#A1A1A6;
  --line:rgba(17,17,19,.08); --line2:rgba(17,17,19,.14);
  --lock:#30D158; --ask:#2F7BF6;
  --night:#0E0E10; --night2:#18181B; --night3:#232327; --nline:rgba(255,255,255,.10);
  --serif:"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","Source Han Serif CN",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,monospace;
  --maxw:1160px; --r:20px;
  --shadow:0 40px 90px -30px rgba(17,17,19,.25),0 10px 30px -12px rgba(17,17,19,.10);
}
html[lang="zh-Hant"]{--serif:"Songti TC","STSong","Noto Serif TC","Source Han Serif TC",serif;--sans:-apple-system,BlinkMacSystemFont,"PingFang TC","Microsoft JhengHei",sans-serif}
html[lang="en"]{--serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
a{color:inherit;text-decoration:none}
h1,h2,h3,p,dl,dd,dt,ol,ul{margin:0;padding:0}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--ask);outline-offset:3px;border-radius:8px}
.wrap{width:min(var(--maxw),calc(100% - 40px));margin:0 auto}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- 按钮：胶囊形，呼应 App 的录音胶囊 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:42px;padding:0 20px;border-radius:999px;
  border:1px solid var(--line2);background:var(--card);font-size:14.5px;font-weight:600;cursor:pointer;white-space:nowrap;
  transition:transform .15s ease,background .15s ease,box-shadow .15s ease}
.btn:hover{transform:translateY(-1px)}
.btn svg{width:16px;height:16px;flex:none}
.btn-ink{background:var(--ink);border-color:var(--ink);color:#fff}
.btn-ink:hover{background:#000;box-shadow:0 14px 28px -14px rgba(0,0,0,.6)}
.btn-sm{height:34px;padding:0 15px;font-size:13.5px}
.btn-lg{height:48px;padding:0 24px;font-size:15px}
.btn-ghost-dark{background:transparent;border-color:var(--nline);color:#fff}
.btn-white{background:#fff;border-color:#fff;color:var(--ink)}

/* ---------- 导航 ---------- */
.nav{position:sticky;top:0;z-index:40;background:rgba(251,251,252,.8);
  -webkit-backdrop-filter:saturate(180%) blur(18px);backdrop-filter:saturate(180%) blur(18px);
  border-bottom:1px solid transparent;transition:border-color .2s ease,background .25s ease,color .25s ease}
.nav.is-scrolled{border-bottom-color:var(--line)}
.nav.is-dark{background:rgba(14,14,16,.78);border-bottom-color:rgba(255,255,255,.08);color:#F5F5F7}
.nav.is-dark .nav-links,.nav.is-dark .gh{color:#A1A1A6}
.nav.is-dark .nav-links a:hover,.nav.is-dark .gh:hover{color:#fff}
.nav.is-dark .brand-mark{background:#fff;color:var(--ink)}
.nav.is-dark .btn-ink{background:#fff;border-color:#fff;color:var(--ink)}
.nav-in{display:flex;align-items:center;gap:36px;height:60px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:650;letter-spacing:-.01em}
.brand-mark{width:28px;height:28px;border-radius:8px;background:var(--ink);color:#fff;display:grid;place-items:center}
.brand-mark svg{width:22px;height:22px}
.nav-links{display:flex;gap:26px;font-size:14.5px;color:var(--lead)}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--ink)}
.nav-end{margin-left:auto;display:flex;align-items:center;gap:16px}
.langsw{display:inline-flex;align-items:center;border:1px solid var(--line2);border-radius:999px;padding:2px}
.langsw a{padding:3px 9px;border-radius:999px;font-size:12px;font-weight:600;color:var(--lead);line-height:1.4}
.langsw a:hover{color:var(--ink)}
.langsw a.on{background:var(--ink);color:#fff}
.nav.is-dark .langsw{border-color:rgba(255,255,255,.18)}
.nav.is-dark .langsw a.on{background:#fff;color:var(--ink)}
.gh{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:500;color:var(--lead)}
.gh:hover{color:var(--ink)}
.gh svg{width:17px;height:17px}

/* ---------- 通用段落头 ---------- */
.sec{padding:100px 0}
.kicker{font-size:13.5px;font-weight:500;letter-spacing:.12em;color:var(--lead)}
.h2{font-family:var(--serif);font-weight:700;font-size:clamp(26px,3.4vw,42px);line-height:1.25;letter-spacing:-.005em;margin-top:12px;text-wrap:balance}
.lede{margin-top:16px;font-size:16px;line-height:1.75;color:var(--lead);max-width:36em}
.head-center{text-align:center}
.head-center .lede{margin-left:auto;margin-right:auto}

/* ---------- 常见问题 ---------- */
.faq{margin-top:48px;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:19px 2px;font-size:16px;font-weight:600}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";width:10px;height:10px;flex:none;border-right:1.6px solid var(--lead);border-bottom:1.6px solid var(--lead);
  transform:rotate(45deg) translateY(-3px);transition:transform .2s ease}
.faq details[open] summary::after{transform:rotate(-135deg) translateY(-2px)}
.faq .ans{padding:0 2px 24px;color:var(--lead);max-width:46em}
.faq .ans a{color:var(--ink);text-decoration:underline;text-underline-offset:3px}
.faq code{font-family:var(--mono);font-size:.9em;background:var(--mist);padding:1px 6px;border-radius:5px}

/* ---------- 结尾行动 ---------- */
.finale{padding:110px 0 120px;text-align:center;background:
  radial-gradient(60% 70% at 50% 100%,#E9E9EC 0%,rgba(233,233,236,0) 70%),var(--paper)}
.finale .h2{font-size:clamp(32px,4.4vw,54px)}
.finale p{margin-top:14px;color:var(--lead);font-size:16px}
.finale .row{margin-top:28px;display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.idle-cap{margin:0 auto 28px;width:84px;height:34px;border-radius:999px;background:var(--ink);display:flex;align-items:center;justify-content:center;gap:4px;
  box-shadow:0 18px 36px -16px rgba(0,0,0,.55)}
.idle-cap i{display:block;width:3px;border-radius:2px;background:#fff;height:8px;animation:idle 1.6s ease-in-out infinite}
.idle-cap i:nth-child(2){animation-delay:-.3s}.idle-cap i:nth-child(3){animation-delay:-.6s}
.idle-cap i:nth-child(4){animation-delay:-.9s}.idle-cap i:nth-child(5){animation-delay:-1.2s}
@keyframes idle{0%,100%{height:6px}50%{height:18px}}

/* ---------- 页脚 ---------- */
.foot{border-top:1px solid var(--line);padding:64px 0 40px;font-size:14px;color:var(--lead)}
.foot-grid{display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:32px}
.foot-brand p{margin-top:14px;max-width:22em}
.foot h4{margin:0 0 14px;font-size:12.5px;font-weight:500;letter-spacing:.1em;color:var(--faint)}
.foot .brand{color:var(--ink)}
.foot ul{list-style:none;display:grid;gap:9px}
.foot a:hover{color:var(--ink)}
.foot-bottom{margin-top:56px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--faint)}


@media (max-width:900px){
  .nav-links{display:none}
  .gh span{display:none}
  .sec{padding:72px 0}
  .foot-grid{grid-template-columns:1fr 1fr}
  .foot-brand{grid-column:1/-1}
}
@media (max-width:480px){
  .nav-in{gap:12px}
  .nav-end{gap:10px}
  .gh{display:none}
  .brand{font-size:17px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}