/* mdtohtml.app — site UI (Vercel-style, Geist, Claude orange accent) */
:root{
  --bg:#ffffff; --panel:#ffffff; --border:#eaeaea; --text:#000000; --muted:#666666;
  --accent:#000000; --accent-soft:#fafafa; --link:#D97757; --brand:#D97757; --radius:8px;
  --mono:"Geist Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
[data-theme="dark"]{
  --bg:#000000; --panel:#0a0a0a; --border:#333333; --text:#ededed; --muted:#888888;
  --accent:#ededed; --accent-soft:#111111; --link:#E8927C; --brand:#E8927C;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Geist",-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;transition:background .2s,color .2s}
.icon{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0;vertical-align:-2px}

/* Nav */
nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;
    padding:14px 28px;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.logo{font-family:"Geist",sans-serif;font-weight:600;font-size:16px;letter-spacing:-.03em;display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none}
.logo .mark{width:30px;height:30px;background:#000;border:1px solid var(--border);border-radius:4px;
  display:flex;align-items:flex-end;justify-content:center;padding-bottom:3px;
  color:#D97757;font-family:var(--mono);font-size:7.5px;font-weight:600;letter-spacing:.08em;line-height:1}
.nav-right{display:flex;align-items:center;gap:20px;font-size:14px}
.nav-right a{color:var(--muted);text-decoration:none}
.nav-right a:hover{color:var(--text)}
.btn{display:inline-flex;align-items:center;gap:6px;border:none;border-radius:8px;padding:8px 14px;font-size:14px;font-weight:600;cursor:pointer;transition:.15s;font-family:inherit}
.btn-primary{background:var(--accent);color:var(--bg)}
.btn-primary:hover{opacity:.82}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn-ghost:hover{border-color:var(--text)}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.mode-toggle{background:none;border:1px solid var(--border);border-radius:8px;width:34px;height:34px;cursor:pointer;color:var(--text);display:inline-flex;align-items:center;justify-content:center}

/* Hero */
.hero{text-align:center;padding:56px 20px 36px}
.hero h1{font-size:clamp(28px,5vw,44px);letter-spacing:-.03em;line-height:1.15;font-weight:800}
.hero h1 em{font-style:normal;color:var(--brand)}
.hero p{margin-top:14px;color:var(--muted);font-size:17px;max-width:560px;margin-left:auto;margin-right:auto}
.privacy-badge{display:inline-flex;align-items:center;gap:6px;margin-top:18px;font-size:13px;color:var(--brand);
  background:color-mix(in srgb,var(--brand) 10%,transparent);padding:5px 12px;border-radius:99px;font-weight:500}

/* App */
.app{max-width:1200px;margin:28px auto 0;padding:0 20px}
.toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:12px}
.toolbar .spacer{flex:1}
select{background:var(--panel);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-size:13.5px;cursor:pointer;font-family:inherit}
.drop-hint{font-size:13px;color:var(--muted)}
.panes{display:grid;grid-template-columns:1fr 1fr;gap:14px;min-height:480px}
@media(max-width:860px){.panes{grid-template-columns:1fr}}
.pane{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);display:flex;flex-direction:column;overflow:hidden}
.pane-head{display:flex;align-items:center;gap:4px;padding:8px 12px;border-bottom:1px solid var(--border);font-size:12.5px;color:var(--muted)}
.tab{padding:5px 10px;border-radius:6px;cursor:pointer;font-weight:500;background:none;border:none;color:var(--muted);font-size:12.5px;font-family:inherit}
.tab.active{background:var(--accent-soft);color:var(--text)}
textarea{flex:1;width:100%;border:none;outline:none;resize:none;padding:18px;font-family:var(--mono);font-size:13.5px;line-height:1.7;background:transparent;color:var(--text)}
#preview{flex:1;overflow:auto;padding:26px 30px}
#htmlcode{flex:1;overflow:auto;padding:18px;font-family:var(--mono);font-size:12.5px;white-space:pre-wrap;word-break:break-all;display:none;color:var(--muted)}
.pane.dragover{border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 15%,transparent)}

/* in-app preview typography */
#preview h1,#preview h2,#preview h3{letter-spacing:-.02em;line-height:1.3;margin:1.2em 0 .5em}
#preview h1{font-size:1.8em;border-bottom:1px solid var(--border);padding-bottom:.3em;margin-top:0}
#preview h2{font-size:1.4em}
#preview p,#preview ul,#preview ol{margin:.6em 0}
#preview ul,#preview ol{padding-left:1.4em}
#preview code{font-family:var(--mono);font-size:.88em;background:var(--accent-soft);padding:2px 5px;border-radius:5px}
#preview pre{background:#000;color:#ededed;border:1px solid #333;padding:14px 16px;border-radius:8px;overflow:auto;margin:.8em 0}
#preview pre code{background:none;color:inherit;padding:0}
#preview blockquote{border-left:3px solid var(--brand);padding-left:14px;color:var(--muted);margin:.8em 0}
#preview table{border-collapse:collapse;width:100%;margin:.8em 0;font-size:.95em}
#preview th,#preview td{border:1px solid var(--border);padding:7px 11px;text-align:left}
#preview th{background:var(--accent-soft)}
#preview a{color:var(--link)}
#preview img{max-width:100%;border-radius:8px}

/* actions */
.actions{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0 8px;align-items:center}
.hint{font-size:12.5px;color:var(--muted);margin-left:auto}

/* modal */
.overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);display:none;align-items:center;justify-content:center;z-index:100;padding:20px}
.overlay.open{display:flex}
.modal{background:var(--panel);border:1px solid var(--border);border-radius:16px;max-width:520px;width:100%;padding:26px}
.modal h3{font-size:18px;margin-bottom:4px;letter-spacing:-.01em}
.modal .sub{font-size:13.5px;color:var(--muted);margin-bottom:18px}
.share-opt{border:1px solid var(--border);border-radius:12px;padding:16px;margin-bottom:12px}
.share-opt .row{display:flex;align-items:center;gap:8px;margin-bottom:6px}
.share-opt .title{font-weight:650;font-size:14.5px}
.badge{font-size:11px;font-weight:700;padding:2px 8px;border-radius:99px}
.badge.free{background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand)}
.badge.pro{background:var(--accent-soft);color:var(--muted);border:1px solid var(--border)}
.share-opt p{font-size:12.5px;color:var(--muted);margin-bottom:10px}
.share-opt .warn{color:var(--brand)}
.linkbox{display:flex;gap:8px}
.linkbox input{flex:1;border:1px solid var(--border);background:var(--bg);border-radius:8px;padding:8px 10px;font-family:var(--mono);font-size:12px;color:var(--text)}
.close-x{float:right;background:none;border:none;color:var(--muted);cursor:pointer}

/* pricing */
.pricing{max-width:880px;margin:72px auto;padding:0 20px;text-align:center}
.pricing h2{font-size:30px;letter-spacing:-.02em}
.pricing .sub{color:var(--muted);margin:8px 0 32px}
.plans{display:grid;grid-template-columns:1fr 1fr;gap:16px;text-align:left}
@media(max-width:700px){.plans{grid-template-columns:1fr}}
.plan{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:26px}
.plan.featured{border-color:var(--text);box-shadow:0 8px 30px -14px rgba(0,0,0,.35)}
.plan .name{font-weight:700;font-size:15px;display:flex;align-items:center;gap:8px}
.plan .price{font-size:34px;font-weight:800;letter-spacing:-.03em;margin:8px 0 2px}
.plan .per{font-size:13px;color:var(--muted);margin-bottom:16px}
.plan ul{list-style:none;font-size:14px;display:grid;gap:9px;margin-bottom:22px}
.plan li::before{content:"✓";color:var(--brand);font-weight:700;margin-right:8px}
.plan li.na{color:var(--muted)}
.plan li.na::before{content:"—";color:var(--muted)}
.plan .btn{width:100%;justify-content:center}

/* content / faq / howto */
.content{max-width:760px;margin:72px auto;padding:0 20px}
.content h2{font-size:24px;letter-spacing:-.02em;margin-bottom:18px}
.content h3{font-size:16px;margin:22px 0 6px}
.content p,.content li{font-size:15px;color:var(--muted)}
.content ol{padding-left:1.3em}
.content details{border:1px solid var(--border);border-radius:10px;padding:14px 16px;margin-bottom:10px}
.content summary{cursor:pointer;font-weight:600;font-size:14.5px;color:var(--text)}
.content details p{margin-top:8px;font-size:14px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:8px}
@media(max-width:700px){.steps{grid-template-columns:1fr}}
.step{border:1px solid var(--border);border-radius:12px;padding:16px}
.step .n{font-family:var(--mono);font-size:12px;color:var(--brand);font-weight:700}
.step .t{font-weight:650;font-size:14.5px;margin:4px 0 2px;color:var(--text)}
.step p{font-size:13px}

footer{border-top:1px solid var(--border);padding:26px 28px;display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;font-size:13px;color:var(--muted)}
footer a{color:var(--muted);text-decoration:none;margin-left:16px}
footer a:hover{color:var(--text)}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(80px);background:var(--text);color:var(--bg);
  padding:10px 18px;border-radius:99px;font-size:13.5px;font-weight:600;transition:.25s;z-index:200}
.toast.show{transform:translateX(-50%) translateY(0)}

/* viewer page */
.viewer-bar{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;border-bottom:1px solid var(--border);font-size:13px}
.viewer-bar .right a{color:var(--muted);text-decoration:none;margin-left:14px}
.viewer-bar .right a:hover{color:var(--text)}
#viewerFrame{width:100%;height:calc(100vh - 54px);border:none;display:block;background:#fff}
.viewer-error{max-width:520px;margin:80px auto;text-align:center;padding:0 20px}
.viewer-error h2{letter-spacing:-.02em;margin-bottom:8px}
.viewer-error p{color:var(--muted);font-size:14.5px}