/* -------- reset & tokens -------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif;font-size:15px;line-height:1.65;color:#1a1a1a;background:#fafafa;-webkit-font-smoothing:antialiased}
:root{
  --bg:#fafafa;
  --surface:#ffffff;
  --ink:#1a1a1a;
  --ink-2:#555;
  --ink-3:#8a8a8a;
  --line:#e8e8ea;
  --line-2:#f0f0f2;
  --accent:#f2c94c;      /* Miro yellow */
  --accent-ink:#111;
  --blue:#4262ff;
  --pink:#ff7ac6;
  --green:#22c55e;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 1px 2px rgba(0,0,0,.04), 0 4px 20px rgba(0,0,0,.04);
  --shadow-lg:0 10px 40px rgba(0,0,0,.08);
  --max:1180px;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;font-size:15px}
h1,h2,h3,h4{margin:0;font-weight:600;letter-spacing:-.01em;color:var(--ink)}
p{margin:0}
img{max-width:100%;display:block}
textarea,input{font-family:inherit;font-size:15px;color:var(--ink)}

/* -------- layout -------- */
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
section{padding:72px 0}
section.tight{padding:48px 0}
.eyebrow{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--blue);background:#eef1ff;padding:6px 12px;border-radius:999px}
.sec-head{max-width:720px;margin-bottom:36px}
.sec-head h2{font-size:32px;line-height:1.25;margin:16px 0 12px}
.sec-head p{color:var(--ink-2);font-size:16px}

/* -------- header -------- */
.top{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line)}
.top-inner{display:flex;align-items:center;gap:24px;height:60px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px}
.logo-mark{width:30px;height:30px;border-radius:8px;background:var(--accent);display:grid;place-items:center;font-size:15px;color:#111;font-weight:700}
.nav{display:flex;gap:6px;margin-left:auto}
.nav a{padding:8px 14px;border-radius:8px;color:var(--ink-2);font-size:14px;transition:.15s}
.nav a:hover{background:var(--line-2);color:var(--ink)}
.cta-mini{background:var(--ink);color:#fff;padding:8px 16px;border-radius:8px;font-size:14px;font-weight:500}
.cta-mini:hover{background:#333}
.burger{display:none;margin-left:auto;padding:8px;border-radius:8px}
.burger span{display:block;width:20px;height:2px;background:var(--ink);margin:4px 0}

/* -------- hero -------- */
.hero{padding:60px 0 40px;position:relative;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.hero h1{font-size:48px;line-height:1.1;letter-spacing:-.02em;font-weight:700}
.hero h1 .hl{background:linear-gradient(180deg,transparent 60%,var(--accent) 60%);padding:0 6px}
.hero .lead{margin-top:20px;font-size:17px;color:var(--ink-2);max-width:520px}
.hero-badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.badge{font-size:12px;padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--ink-2)}
.hero-actions{margin-top:32px;display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:10px;font-weight:500;font-size:15px;transition:.18s;border:1px solid transparent}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:#000;transform:translateY(-1px);box-shadow:0 6px 18px rgba(0,0,0,.15)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--ink)}
.hero-visual{position:relative;height:100%;min-height:340px}
.float-card{position:absolute;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow);font-size:13px;line-height:1.5}
.fc-1{top:0;left:20px;width:220px}
.fc-1 .k{color:var(--ink-3);font-size:11px;margin-bottom:4px}
.fc-1 .v{font-weight:600}
.fc-2{top:80px;right:0;width:260px;background:var(--accent)}
.fc-2 .roar{font-size:22px;line-height:1.4;font-weight:600}
.fc-3{bottom:20px;left:60px;width:280px}
.fc-3 .dots{display:inline-flex;gap:4px;margin-right:8px}
.fc-3 .dots i{width:8px;height:8px;border-radius:50%;background:var(--green);display:inline-block}
.blob{position:absolute;border-radius:50%;filter:blur(60px);opacity:.5;z-index:-1}
.blob.a{width:280px;height:280px;background:#ffe89a;top:-40px;right:-40px}
.blob.b{width:240px;height:240px;background:#c8d2ff;bottom:-40px;left:20%}

/* -------- tool card -------- */
.tool{margin-top:8px}
.tool-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:28px;box-shadow:var(--shadow-lg)}
.tabs{display:inline-flex;gap:4px;padding:4px;background:var(--line-2);border-radius:12px;margin-bottom:20px}
.tab{padding:8px 18px;border-radius:9px;font-size:14px;font-weight:500;color:var(--ink-2);transition:.15s}
.tab.active{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.06)}
.tool-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:stretch}
.tool-col{display:flex;flex-direction:column}
.col-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.col-head label{font-size:13px;font-weight:600;color:var(--ink-2)}
.col-head .count{font-size:12px;color:var(--ink-3)}
textarea{width:100%;min-height:100px;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:#fbfbfc;resize:vertical;line-height:1.6;outline:none;transition:.15s}
textarea:focus{border-color:var(--ink);background:#fff}
#output{background:#fffbe6;color:var(--ink);cursor:default;resize:none;caret-color:transparent}
#output:focus{border-color:var(--line);background:#fffbe6;outline:none;box-shadow:none}
.arrow-col{display:flex;align-items:center;justify-content:center}
.arrow-btn{width:44px;height:44px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;transition:.2s}
.arrow-btn:hover{background:var(--blue)}
.tool-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}
.chip{padding:8px 14px;font-size:13px;border-radius:8px;background:var(--line-2);color:var(--ink-2);transition:.15s;border:1px solid transparent}
.chip:hover{background:var(--ink);color:#fff}
.chip.primary{background:var(--accent);color:var(--accent-ink);font-weight:600}
.chip.primary:hover{background:#e8b83a}
.chip.danger:hover{background:#e74c3c;color:#fff}
.settings{margin-top:20px;padding:16px;background:#fbfbfc;border-radius:12px;border:1px dashed var(--line)}
.settings-title{font-size:13px;font-weight:600;color:var(--ink-2);margin-bottom:10px;}
.char-row{display:flex;gap:10px}
.char-row input{flex:1;width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;text-align:left;font-size:16px;letter-spacing:4px;outline:none}
.char-row input:focus{border-color:var(--ink)}
.char-slot{position:relative}
.char-slot label{position:absolute;top:-8px;left:10px;background:#fbfbfc;font-size:10px;color:var(--ink-3);padding:0 4px}
.char-slot input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;text-align:center;font-size:16px;outline:none}
.char-slot input:focus{border-color:var(--ink)}
.reset-link{font-size:12px;color:var(--blue);margin-top:8px;display:inline-block;cursor:pointer}
.toast{position:fixed;bottom:32px;left:50%;transform:translate(-50%,20px);background:var(--ink);color:#fff;padding:12px 22px;border-radius:10px;font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:100}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* -------- features -------- */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.2s}
.feat:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:transparent}
.feat-icon{width:44px;height:44px;border-radius:10px;display:grid;place-items:center;font-size:20px;margin-bottom:16px}
.i-a{background:#fff4d1;color:#a07500}
.i-b{background:#e4eaff;color:#3652d9}
.i-c{background:#ffe1f0;color:#c62a86}
.i-d{background:#d9f5e2;color:#128c3b}
.i-e{background:#f0e2ff;color:#6a2ac2}
.i-f{background:#ffe1d6;color:#c4491a}
.feat h3{font-size:17px;margin-bottom:8px}
.feat p{color:var(--ink-2);font-size:14px}

/* -------- intro (what is) -------- */
.split{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center}
.intro-list{margin-top:20px;display:grid;gap:14px}
.intro-list li{list-style:none;padding-left:28px;position:relative;color:var(--ink-2);font-size:15px}
.intro-list li::before{content:"";position:absolute;left:0;top:9px;width:14px;height:14px;border-radius:4px;background:var(--accent);transform:rotate(45deg)}
.demo-box{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:var(--shadow)}
.demo-line{padding:12px 14px;border-radius:10px;background:#fbfbfc;font-size:14px;margin-bottom:10px;border:1px solid var(--line-2)}
.demo-line .lbl{font-size:11px;color:var(--ink-3);text-transform:uppercase;letter-spacing:.08em;display:block;margin-bottom:4px}
.demo-line .txt{font-weight:500;word-break:break-all}
.demo-line.out{background:var(--accent);border-color:var(--accent);color:#111}
.demo-line.out .lbl{color:#7a5a00}

/* -------- algorithm -------- */
.algo-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;position:relative}
.step-n{width:26px;height:26px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:12px;font-weight:600;margin-bottom:12px}
.step h4{font-size:15px;margin-bottom:6px}
.step p{font-size:13px;color:var(--ink-2);line-height:1.55}
.step code{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;background:var(--line-2);padding:2px 6px;border-radius:4px;font-size:12px}

/* -------- scenarios -------- */
.scene-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.scene{padding:24px;border-radius:var(--radius);border:1px solid var(--line);background:#fff;transition:.2s}
.scene:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.scene:hover .scene-num,.scene:hover .scene-sub{color:rgba(255,255,255,.6)}
.scene:hover h4{color:#fff}
.scene-num{font-size:12px;color:var(--ink-3);font-weight:600;margin-bottom:20px}
.scene h4{font-size:16px;margin-bottom:6px}
.scene-sub{font-size:13px;color:var(--ink-2);line-height:1.55}

/* -------- tutorial -------- */
.tut{background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden}
.tut-row{display:grid;grid-template-columns:80px 1fr;gap:24px;padding:24px 28px;border-bottom:1px solid var(--line-2);align-items:start}
.tut-row:last-child{border-bottom:0}
.tut-num{font-size:26px;font-weight:700;color:var(--ink-3);font-variant-numeric:tabular-nums}
.tut h4{font-size:16px;margin-bottom:6px}
.tut p{color:var(--ink-2);font-size:14px}

/* -------- faq -------- */
.faq{display:grid;gap:12px;max-width:820px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:0;transition:.15s}
.faq details[open]{border-color:var(--ink);box-shadow:var(--shadow)}
.faq summary{list-style:none;padding:18px 22px;cursor:pointer;font-weight:500;font-size:15px;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--ink-3);font-weight:300;transition:.2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq .a{padding:0 22px 20px;color:var(--ink-2);font-size:14.5px;line-height:1.7}

/* -------- footer -------- */
footer{background:#111;color:#aaa;padding:56px 0 32px;margin-top:60px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
footer h5{color:#fff;font-size:13px;margin-bottom:14px;font-weight:600;letter-spacing:.04em}
footer a{display:block;padding:4px 0;font-size:13.5px;color:#aaa;transition:.15s}
footer a:hover{color:#fff}
.foot-brand{font-size:15px;color:#fff;font-weight:600;margin-bottom:10px;display:flex;align-items:center;gap:10px}
.foot-desc{font-size:13.5px;line-height:1.7;color:#888;max-width:320px}
.foot-bottom{border-top:1px solid #222;padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:12.5px;color:#666}

/* -------- responsive -------- */
@media (max-width:960px){
  section{padding:56px 0}
  .hero{padding:40px 0 24px}
  .hero-grid,.split{grid-template-columns:1fr;gap:36px}
  .hero h1{font-size:36px}
  .hero-visual{min-height:280px}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .algo-grid{grid-template-columns:repeat(2,1fr)}
  .scene-grid{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr;gap:28px}
  .nav{display:none}
  .cta-mini{display:none}
  .burger{display:block}
  .nav.open{display:flex;position:absolute;top:60px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:12px 16px;flex-direction:column;gap:2px}
}
@media (max-width:640px){
  .wrap{padding:0 18px}
  section{padding:48px 0}
  .hero h1{font-size:30px}
  .hero-visual{display:none}
  .sec-head h2{font-size:26px}
  .tool-grid{grid-template-columns:1fr;gap:12px}
  .arrow-col{padding:6px 0}
  .arrow-btn{transform:rotate(90deg)}
  .feat-grid,.algo-grid,.scene-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr;gap:22px}
  .tool-card{padding:20px}
  .char-row{grid-template-columns:repeat(2,1fr)}
  .tut-row{grid-template-columns:1fr;gap:6px;padding:20px}
  .tut-num{font-size:20px}
}