:root{
  --bg:#f3f4f6;--card:#fff;--ink:#111827;--muted:#6b7280;--line:#e5e7eb;
  --accent:#f97316;--accent2:#ea580c;--dark:#111827;--ok:#15803d;--danger:#b91c1c;
  --radius:18px;--shadow:0 8px 28px rgba(17,24,39,.08);
}
*{box-sizing:border-box}html{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}
body{margin:0;min-height:100vh;padding-bottom:92px;background:linear-gradient(180deg,#fff 0,#f3f4f6 220px)}
button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.55;cursor:not-allowed}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:18px max(16px,calc((100vw - 860px)/2));background:rgba(255,255,255,.93);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.topbar h1{font-size:1.35rem;margin:2px 0 0}.eyebrow{font-size:.7rem;letter-spacing:.13em;font-weight:800;color:var(--accent2)}
.shell{max-width:860px;margin:0 auto;padding:20px 14px 30px}.view{display:none}.view.active{display:block}.stack{display:grid;gap:12px}.stack-gap{display:grid;gap:16px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.hero{display:flex;gap:14px;align-items:flex-start;margin-bottom:16px}.hero h2,.card h2{margin:0 0 6px;font-size:1.15rem}.hero p,.hint{margin:0;color:var(--muted);line-height:1.5}.step-badge{display:grid;place-items:center;min-width:36px;height:36px;border-radius:12px;background:#fff7ed;color:var(--accent2);font-weight:900;border:1px solid #fed7aa}
label{font-weight:750;font-size:.92rem}input,textarea,select{width:100%;border:1px solid #d1d5db;border-radius:14px;background:#fff;color:var(--ink);padding:14px;outline:none}textarea{resize:vertical}input:focus,textarea:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(249,115,22,.12)}
.input-row{display:grid;grid-template-columns:1fr auto;gap:8px}.primary,.secondary,.ghost{border:0;border-radius:14px;font-weight:800;padding:12px 16px}.primary{background:var(--dark);color:#fff}.primary:hover{background:#1f2937}.secondary{background:#fff7ed;color:#9a3412;border:1px solid #fed7aa}.ghost{background:#f9fafb;color:#374151;border:1px solid var(--line)}.big{min-height:50px}.small{padding:8px 12px}.center{text-align:center;text-decoration:none;display:block}
details{border:1px solid var(--line);border-radius:14px;padding:12px}summary{font-weight:800;cursor:pointer}.status{padding:12px 14px;border-radius:12px;background:#eff6ff;color:#1d4ed8}.alert.error,.status.error{background:#fef2f2;color:var(--danger)}.hidden{display:none!important}
.section-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:14px}.pill{font-size:.76rem;padding:7px 10px;border-radius:999px;background:#f3f4f6;color:#4b5563;font-weight:800}.source-text{white-space:pre-wrap;color:#4b5563;line-height:1.55;max-height:220px;overflow:auto}.thumb{width:100%;max-height:330px;object-fit:contain;border-radius:14px;background:#f9fafb;margin:8px 0 12px}
.desc-card{border:1px solid var(--line);border-radius:14px;padding:13px;background:#fafafa}.desc-card p{margin:0 0 10px;line-height:1.5}.desc-actions{display:flex;align-items:center;justify-content:space-between;gap:10px}.counter{font-size:.78rem;color:var(--muted);font-weight:700}
.download-box{display:grid;gap:10px}.progress-track{height:12px;background:#e5e7eb;border-radius:99px;overflow:hidden}.progress-bar{height:100%;width:0;background:var(--accent);transition:width .25s ease}.download-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:.86rem}
.file-card,.history-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px}.file-title,.history-title{font-weight:850;word-break:break-word}.file-meta,.history-meta{font-size:.78rem;color:var(--muted);margin-top:5px}.file-actions{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}.file-actions a{text-decoration:none}.danger{background:#fef2f2;color:var(--danger);border:1px solid #fecaca}.history-copy{margin-top:10px;padding:10px;border-radius:10px;background:#f9fafb;color:#374151;line-height:1.4}
.bottom-nav{position:fixed;z-index:30;left:50%;bottom:12px;transform:translateX(-50%);width:min(520px,calc(100% - 20px));display:grid;grid-template-columns:repeat(4,1fr);background:#111827;border-radius:20px;padding:7px;box-shadow:0 14px 35px rgba(17,24,39,.25)}.nav-btn{border:0;background:transparent;color:#9ca3af;border-radius:14px;padding:9px 4px 8px;font-size:.72rem;font-weight:800}.nav-btn span{display:block;font-size:1.15rem;line-height:1.1;margin-bottom:2px}.nav-btn.active{background:#fff;color:#111827}
.toast{position:fixed;z-index:50;left:50%;bottom:98px;transform:translateX(-50%);background:#111827;color:#fff;padding:12px 15px;border-radius:12px;box-shadow:var(--shadow);max-width:calc(100% - 30px);font-weight:750}.notice{padding:13px;border-radius:12px;background:#fffbeb;border:1px solid #fde68a;color:#92400e;line-height:1.45}.help-list{padding-left:22px;margin:0;display:grid;gap:12px;line-height:1.5}
.login-body{display:grid;place-items:center;padding:20px;min-height:100vh}.login-card{width:min(390px,100%);background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:24px}.login-card h1{margin:12px 0 4px}.login-card>p{margin:0 0 20px;color:var(--muted)}.brand-mark{width:54px;height:54px;display:grid;place-items:center;border-radius:16px;background:#111827;color:#fff;font-weight:950;letter-spacing:.04em}
@media(min-width:700px){.shell{padding-top:28px}.card{padding:22px}.bottom-nav{bottom:18px}.topbar{padding-top:20px;padding-bottom:20px}}