/* ============================================================
   墨笔 · Mobieditor 官网
   Design tokens — extracted from mobieditor-website-2.html
   ============================================================ */
:root{
  --bg: oklch(98% .006 84.6);
  --surface: oklch(100% 0 89.9);
  --fg: oklch(28.4% .009 67.4);
  --muted: oklch(53.1% .013 71.8);
  --border: oklch(91.2% .01 72.7);
  --accent: oklch(54.3% .167 32.2);
  --soft: oklch(96.2% .015 46);
  --serif: "Iowan Old Style","Songti SC",STSong,serif;
  --sans: "PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --mono: "SFMono-Regular","Cascadia Code",Menlo,monospace;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --ease: cubic-bezier(.25,.1,.25,1);
}

/* ============ Base ============ */
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);line-height:1.5;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button{font:inherit}
img{display:block;max-width:100%}
.shell{width:min(1180px,calc(100% - 48px));margin:auto}
::selection{background:color-mix(in oklch,var(--accent) 18%,transparent)}

/* ============ Navigation ============ */
.nav{position:fixed;z-index:20;inset:0 0 auto;height:76px;background:color-mix(in oklch,var(--bg) 88%,transparent);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid color-mix(in oklch,var(--border) 80%,transparent)}
.nav-inner{height:100%;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:10px;margin-right:auto;font:700 18px var(--serif);letter-spacing:.08em}
.brand img{width:29px;height:29px;border-radius:8px}
.nav-links{display:flex;align-items:center;gap:22px;font-size:14px;color:var(--muted)}
.nav-links a:hover{color:var(--fg)}
.actions{display:flex;gap:10px}

/* ============ Buttons ============ */
.button{min-height:42px;display:inline-flex;align-items:center;justify-content:center;padding:0 16px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--fg);font-size:14px;font-weight:650;box-shadow:0 4px 10px color-mix(in oklch,var(--fg) 5%,transparent);transition:transform .2s ease,box-shadow .2s ease,background .2s ease;cursor:pointer}
.button:hover{transform:translateY(-2px);box-shadow:0 10px 20px color-mix(in oklch,var(--fg) 12%,transparent)}
.button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.button:active{transform:translateY(0);box-shadow:0 4px 10px color-mix(in oklch,var(--fg) 5%,transparent)}
.button.primary{color:var(--surface);background:var(--accent);border-color:var(--accent)}
.button.ghost{background:transparent}
.mobile-menu{display:none}

/* ============ Typography ============ */
.eyebrow{margin:0 0 18px;font:700 12px var(--mono);letter-spacing:.15em;color:var(--accent)}
h1,h2,h3,p{margin-top:0}
h1{max-width:720px;margin-bottom:22px;font:700 clamp(46px,6vw,78px)/1.12 var(--serif);letter-spacing:-.065em}
h2{max-width:610px;margin:0;font:700 clamp(34px,4.1vw,55px)/1.18 var(--serif);letter-spacing:-.05em}
.lead{max-width:580px;margin-bottom:30px;color:var(--muted);font-size:clamp(17px,2vw,20px);line-height:1.8}

/* ============ Hero ============ */
.hero{position:relative;padding:166px 0 80px;overflow:hidden}
.hero::after{content:"";position:absolute;width:560px;height:560px;top:30px;right:-160px;border:1px solid color-mix(in oklch,var(--accent) 18%,transparent);border-radius:50%;opacity:.7;pointer-events:none}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:48px}
.hero-actions .button{min-width:140px;min-height:50px}
.editor-frame{position:relative;padding:12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:0 32px 72px color-mix(in oklch,var(--fg) 14%,transparent);transform:none}
.editor-bar{height:36px;display:flex;align-items:center;gap:7px;padding:0 8px 9px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--border)}
.dot:last-child{background:color-mix(in oklch,var(--accent) 76%,var(--border))}
.screen-wrap{overflow:hidden;border-radius:13px;background:var(--bg)}
.screen-wrap img{display:block;width:100%;height:auto;transform:scale(1.01)}
.floating-note{position:absolute;right:28px;bottom:28px;display:flex;align-items:center;gap:10px;padding:12px 14px;border:1px solid color-mix(in oklch,var(--border) 70%,transparent);border-radius:12px;background:color-mix(in oklch,var(--surface) 90%,transparent);box-shadow:0 12px 30px color-mix(in oklch,var(--fg) 12%,transparent);font-size:13px;font-weight:650;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.pulse{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 0 color-mix(in oklch,var(--accent) 50%,transparent);animation:pulse 2s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 9px transparent}100%{box-shadow:0 0 0 0 transparent}}

/* ============ Sections ============ */
.section{padding:108px 0}
.section-top{display:flex;justify-content:space-between;align-items:end;gap:32px;margin-bottom:38px}
.section-copy{max-width:405px;margin:0;color:var(--muted);font-size:16px;line-height:1.8}

/* ============ Workflow demo ============ */
.demo{display:grid;grid-template-columns:.9fr 1.1fr;overflow:hidden;border:1px solid var(--border);border-radius:20px;background:var(--surface)}
.demo-copy{min-height:430px;padding:42px;display:flex;flex-direction:column;justify-content:space-between;background:color-mix(in oklch,var(--soft) 45%,var(--surface))}
.demo-step{font:700 12px var(--mono);letter-spacing:.1em;color:var(--accent)}
.demo-title{margin:16px 0;font:700 32px/1.25 var(--serif);letter-spacing:-.04em}
.demo-body{color:var(--muted)}
.steps{display:grid;gap:8px;margin-top:32px}
.step{width:100%;padding:10px 0;border:0;border-bottom:1px solid var(--border);background:transparent;color:var(--muted);text-align:left;cursor:pointer}
.step:hover{color:var(--fg)}
.step:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.step[aria-current="true"]{color:var(--fg);font-weight:700}
.step b{color:var(--accent);font-family:var(--mono);margin-right:9px}
.demo-stage{position:relative;min-height:430px;padding:30px;background:oklch(94% .006 84.6)}
.paper{position:absolute;inset:44px 13% 42px;padding:42px 46px;background:var(--surface);border:1px solid var(--border);box-shadow:0 18px 34px color-mix(in oklch,var(--fg) 10%,transparent);transition:transform .45s ease}
.paper::before{content:"";display:block;width:52px;height:3px;margin-bottom:28px;background:var(--accent)}
.paper h3{margin-bottom:14px;font:700 25px/1.35 var(--serif)}
.paper p{color:var(--muted);font-size:14px}
.fake-lines{display:grid;gap:9px;margin-top:25px}
.fake-lines i{display:block;height:7px;border-radius:5px;background:color-mix(in oklch,var(--border) 75%,var(--surface))}
.fake-lines i:nth-child(3){width:68%}
.fake-lines i:nth-child(5){width:84%}
.copy-toast{position:absolute;right:32px;bottom:32px;padding:11px 13px;border-radius:9px;background:var(--accent);color:var(--surface);font:700 12px var(--mono);box-shadow:0 10px 24px color-mix(in oklch,var(--accent) 40%,transparent);opacity:0;transform:translateY(8px);transition:.35s ease;pointer-events:none}
.demo[data-step="3"] .copy-toast{opacity:1;transform:none}
.demo[data-step="1"] .paper{transform:translateX(-9%)}
.demo[data-step="2"] .paper{transform:rotate(.7deg)}

/* ============ Theme gallery ============ */
.theme-section{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--surface)}
.theme-rail{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(265px,1fr);gap:16px;overflow-x:auto;padding-bottom:10px;scrollbar-color:var(--border) transparent}
.theme-rail::-webkit-scrollbar{height:6px}
.theme-rail::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
.theme{min-height:295px;padding:24px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--bg)}
.theme-head{display:flex;justify-content:space-between;font:700 12px var(--mono);color:var(--muted)}
.theme-paper{height:192px;margin-top:18px;padding:23px;background:var(--surface);box-shadow:0 8px 18px color-mix(in oklch,var(--fg) 7%,transparent)}
.theme-paper h3{margin:0 0 12px;font:700 22px/1.2 var(--serif)}
.theme-paper p{margin:0;color:var(--muted);font-size:12px}
.theme.ink .theme-paper{background:oklch(25% .015 67.4);color:var(--bg)}
.theme.ink .theme-paper p{color:oklch(83% .01 67.4)}
.theme.ink .theme-paper h3::after{content:"";display:block;height:2px;width:32px;margin-top:12px;background:var(--accent)}
.theme.classic .theme-paper{border-top:3px solid var(--fg)}
.theme.red .theme-paper h3{color:var(--accent)}
.theme.blue .theme-paper{border-left:3px solid oklch(55% .11 240)}
.theme.blue .theme-paper h3{color:oklch(43% .1 240)}

/* ============ Capabilities ============ */
.capabilities{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.capability{min-height:260px;padding:30px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface)}
.capability-label{color:var(--accent);font:700 12px var(--mono)}
.capability h3{margin:48px 0 12px;font:700 25px/1.28 var(--serif);letter-spacing:-.03em}
.capability p{color:var(--muted);font-size:14px}

/* ============ Download CTA ============ */
.download{position:relative;overflow:hidden;padding:74px;border-radius:24px;background:var(--fg);color:var(--bg)}
.download::before{content:"";position:absolute;width:350px;aspect-ratio:1;right:-70px;top:-140px;border:1px solid color-mix(in oklch,var(--bg) 35%,transparent);border-radius:50%}
.download .eyebrow{color:oklch(76% .12 32.2)}
.download h2{max-width:600px;color:var(--surface)}
.download p{max-width:560px;margin:20px 0 34px;color:oklch(82% .01 67.4);font-size:17px}
.os-list{display:flex;flex-wrap:wrap;gap:12px}
.os-button{position:relative;z-index:1;min-width:155px;min-height:64px;padding:11px 16px;border:1px solid color-mix(in oklch,var(--bg) 25%,transparent);border-radius:12px;background:color-mix(in oklch,var(--surface) 8%,transparent);color:var(--surface);text-align:left;cursor:pointer;transition:transform .2s ease,border-color .2s ease,background .2s ease}
.os-button:hover{transform:translateY(-2px)}
.os-button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.os-button strong{display:block;font-size:14px}
.os-button span{color:oklch(78% .01 67.4);font:11px var(--mono)}
.os-button.recommended{border-color:var(--accent);background:var(--accent)}
.download-note{position:relative;z-index:1;margin-top:26px;color:oklch(75% .01 67.4);font:12px var(--mono)}

/* ============ FAQ ============ */
.faq-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:72px;align-items:start}
.faq-grid .section-copy{margin-top:18px}
.faq-list{border-top:1px solid var(--border)}
.faq-list details{border-bottom:1px solid var(--border);padding:20px 0}
.faq-list summary{cursor:pointer;list-style:none;font-weight:700}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";float:right;color:var(--accent);font:22px/1 var(--mono)}
.faq-list details[open] summary::after{content:"–"}
.faq-list p{max-width:620px;margin:13px 28px 0 0;color:var(--muted);font-size:14px}

/* ============ Footer ============ */
footer{padding:34px 0 42px;border-top:1px solid var(--border)}
.footer-row{display:flex;justify-content:space-between;gap:24px;color:var(--muted);font-size:13px}
.footer-links{display:flex;flex-wrap:wrap;gap:18px}
.footer-links a:hover{color:var(--fg)}

/* ============ Download page ============ */
.download-page{line-height:normal}
.download-page .shell{width:min(1080px,calc(100% - 48px))}
.download-page .nav{position:sticky}
.download-page .button{box-shadow:none;font-weight:700}
.download-page .button:hover{transform:none;box-shadow:none}
.download-page footer{padding:28px 0;font-size:13px;line-height:normal}
.download-page .lead{margin:22px 0 48px}
.download-page .notice{line-height:1.75;background:color-mix(in oklch,var(--surface) 65%,var(--bg))}
.dl-main{padding:92px 0 110px}
.dl-main h1{max-width:720px;margin:0;font:700 clamp(44px,6vw,72px)/1.12 var(--serif);letter-spacing:-.06em}
.dl-main .lead{max-width:580px;margin:22px 0 48px;color:var(--muted);font-size:18px;line-height:1.8}
.downloads{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.os{min-height:258px;padding:30px;border:1px solid var(--border);border-radius:18px;background:var(--surface);box-shadow:0 13px 30px color-mix(in oklch,var(--fg) 5%,transparent);display:flex;flex-direction:column}
.os.marked{border-color:var(--accent);box-shadow:0 18px 42px color-mix(in oklch,var(--accent) 15%,transparent)}
.flag{min-height:22px;color:var(--accent);font:700 11px var(--mono);letter-spacing:.08em}
.os h2{margin:40px 0 9px;font:700 29px var(--serif);letter-spacing:-.04em;color:var(--fg)}
.os p{margin:0;color:var(--muted);font-size:14px}
.os .button{margin-top:auto;justify-content:flex-start}
.notice{margin-top:56px;padding:25px 29px;border:1px solid var(--border);border-radius:15px;background:color-mix(in oklch,var(--surface) 60%,transparent);color:var(--muted);font-size:14px;line-height:1.8}
.notice strong{color:var(--fg)}
.dl-nav .button{font-weight:700}

/* ============ Responsive: tablet & below ============ */
@media(max-width:920px){
  .nav{height:66px}
  .nav-links{display:none}
  .nav-links.open{position:absolute;top:66px;left:16px;right:16px;display:grid;gap:0;padding:8px 16px;border:1px solid var(--border);border-radius:12px;background:var(--surface);box-shadow:0 16px 34px color-mix(in oklch,var(--fg) 12%,transparent)}
  .nav-links.open a{padding:12px 0;border-bottom:1px solid var(--border)}
  .nav-links.open a:last-child{border:0}
  .nav-inner{gap:10px}
  .actions .button{padding:0 11px;font-size:12px}
  .actions .button.ghost{display:none}
  .mobile-menu{display:inline-flex;min-width:42px;padding:0}
  .hero{padding-top:125px}
  .section{padding:76px 0}
  .section-top,.faq-grid{display:grid;grid-template-columns:1fr;gap:18px}
  .demo{grid-template-columns:1fr}
  .demo-copy{min-height:0;padding:30px}
  .demo-stage{min-height:340px}
  .paper{inset:32px 8% 30px;padding:30px}
  .capabilities{grid-template-columns:1fr}
  .capability{min-height:0}
  .capability h3{margin-top:28px}
  .download{padding:40px 28px}
  .footer-row{flex-direction:column}
  .floating-note{right:20px;bottom:20px}
}

/* Download page breakpoint (matches export's 720px rules) */
@media(max-width:720px){
  .download-page .shell{width:min(100% - 32px,1080px)}
  .download-page .nav{height:66px}
  .download-page .nav .button{padding:0 11px;font-size:12px;min-height:42px}
  .download-page .downloads{grid-template-columns:1fr}
  .download-page main{padding:64px 0}
  .download-page .os{min-height:220px}
}

/* ============ Responsive: mobile ============ */
@media(max-width:520px){
  .shell{width:min(100% - 32px,1180px)}
  .brand{gap:7px;font-size:16px}
  .brand img{width:26px;height:26px}
  .actions{gap:6px}
  .actions .button{min-height:36px;padding:0 9px}
  .hero{padding-bottom:58px}
  .hero-actions .button{flex:1;min-width:0}
  .editor-frame{padding:7px;border-radius:14px}
  .editor-bar{height:26px}
  .floating-note{font-size:11px;padding:9px 10px}
  .theme-rail{margin-right:-16px;grid-auto-columns:82%}
  .download h2{font-size:38px}
  .os-button{min-width:calc(50% - 6px)}
  .demo-stage{padding:18px}
  .paper{inset:25px 7% 24px}
  .paper h3{font-size:21px}
}

/* ============ Reduced motion ============ */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}