*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#f59e0b;--secondary:#10b981;--danger:#ef4444;
  --bg:#0f0f14;--bg-surface:#18181f;--bg-card:#1e1e28;
  --border:rgba(255,255,255,.08);
  --text:#e8e8f0;--text-muted:#8888a8;--text-faint:#555570;
  --radius-sm:8px;--radius-md:14px;--radius-lg:20px;
  --transition:.18s cubic-bezier(.4,0,.2,1);
}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}

/* HEADER */
.site-header{position:sticky;top:0;z-index:100;background:rgba(15,15,20,.9);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;gap:24px;height:64px;width:100%;max-width:1280px;margin-inline:auto;padding-inline:clamp(16px,4vw,48px)}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-icon{width:36px;height:36px}
.logo-text{font-size:1.1rem;font-weight:700;letter-spacing:-.02em;background:linear-gradient(135deg,#fff 40%,var(--primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-link{padding:6px 14px;border-radius:var(--radius-sm);font-size:.9rem;font-weight:500;color:var(--text-muted);transition:all var(--transition)}
.nav-link:hover,.nav-link.active{color:var(--text);background:rgba(255,255,255,.06)}

/* LAYOUT */
.main-wrap{width:100%;max-width:1280px;margin-inline:auto;padding:clamp(16px,2.5vw,36px) clamp(16px,4vw,48px) clamp(40px,6vw,80px)}

/* HERO */
.tool-hero{text-align:center;padding:clamp(14px,2.5vw,28px) 0 clamp(16px,2.5vw,24px)}
.tool-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 14px;border-radius:999px;font-size:.75rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;background:rgba(245,158,11,.1);border:1px solid rgba(245,158,11,.25);color:#fcd34d;margin-bottom:14px}
.tool-title{font-size:clamp(1.8rem,4.5vw,2.8rem);font-weight:900;letter-spacing:-.04em;line-height:1.1;margin-bottom:8px}
.gradient-title{background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.tool-subtitle{font-size:clamp(.88rem,2vw,1rem);color:var(--text-muted);max-width:560px;margin:0 auto}

/* PANELS */
.tool-grid{display:grid;grid-template-columns:1fr 340px;gap:20px;align-items:start;margin-top:24px}
@media(max-width:900px){.tool-grid{grid-template-columns:1fr}}

.panel{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden}
.panel-head{padding:14px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:10px}
.panel-title{font-size:.85rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--text-faint)}
.panel-body{padding:18px 20px}

/* UPLOAD */
.upload-zone{border:2px dashed var(--border);border-radius:var(--radius-md);padding:clamp(24px,4vw,40px);text-align:center;cursor:pointer;transition:all var(--transition);position:relative;background:var(--bg-surface)}
.upload-zone:hover,.upload-zone.drag{border-color:rgba(245,158,11,.5);background:rgba(245,158,11,.04)}
.upload-zone input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}
.upload-icon{width:44px;height:44px;border-radius:12px;background:rgba(245,158,11,.1);border:1px solid rgba(245,158,11,.2);display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.upload-icon svg{width:22px;height:22px;stroke:var(--primary);fill:none;stroke-width:2;stroke-linecap:round}
.upload-title{font-size:1rem;font-weight:700;margin-bottom:6px}
.upload-hint{font-size:.82rem;color:var(--text-faint)}
.upload-hint em{color:var(--primary);font-style:normal}

/* FILE CHIP */
.file-chip{display:flex;align-items:center;gap:10px;padding:10px 14px;background:rgba(245,158,11,.06);border:1px solid rgba(245,158,11,.2);border-radius:var(--radius-md);margin-bottom:16px}
.file-chip-icon{width:32px;height:32px;border-radius:8px;background:rgba(245,158,11,.12);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.file-chip-icon svg{width:16px;height:16px;stroke:var(--primary);fill:none;stroke-width:2;stroke-linecap:round}
.file-chip-name{flex:1;font-size:.85rem;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-chip-size{font-size:.75rem;color:var(--text-faint);white-space:nowrap}
.file-chip-remove{width:22px;height:22px;border-radius:50%;background:rgba(239,68,68,.08);border:1px solid rgba(239,68,68,.2);color:#fca5a5;display:flex;align-items:center;justify-content:center;font-size:.75rem;cursor:pointer;flex-shrink:0;transition:all var(--transition)}
.file-chip-remove:hover{background:rgba(239,68,68,.18)}

/* BOOKMARK TREE */
.bm-tree{display:flex;flex-direction:column;gap:6px;min-height:120px}
.bm-item{display:flex;align-items:center;gap:8px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;transition:all var(--transition);cursor:default}
.bm-item:hover{border-color:rgba(255,255,255,.15)}
.bm-item.dragging{opacity:.4}
.bm-item.drag-over{border-color:var(--primary);background:rgba(245,158,11,.06)}

/* indent */
.bm-indent-0{margin-left:0}
.bm-indent-1{margin-left:20px}
.bm-indent-2{margin-left:40px}
.bm-indent-3{margin-left:60px}

.bm-drag-handle{color:var(--text-faint);cursor:grab;flex-shrink:0;line-height:1}
.bm-drag-handle:active{cursor:grabbing}
.bm-drag-handle svg{width:14px;height:14px;stroke:currentColor;fill:none}

.bm-level-btns{display:flex;gap:2px;flex-shrink:0}
.bm-level-btn{width:20px;height:20px;border-radius:4px;background:rgba(255,255,255,.05);border:1px solid var(--border);color:var(--text-faint);font-size:.65rem;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition)}
.bm-level-btn:hover{background:rgba(245,158,11,.1);border-color:rgba(245,158,11,.3);color:var(--primary)}
.bm-level-btn[disabled]{opacity:.25;cursor:default}

.bm-title-input{flex:1;background:transparent;border:none;outline:none;color:var(--text);font-size:.85rem;font-family:inherit;min-width:0}
.bm-title-input::placeholder{color:var(--text-faint)}

.bm-page-input{width:60px;background:var(--bg-card);border:1px solid var(--border);border-radius:6px;padding:3px 7px;color:var(--text);font-size:.8rem;font-family:inherit;outline:none;text-align:center;transition:border-color var(--transition);flex-shrink:0}
.bm-page-input:focus{border-color:var(--primary)}
.bm-page-input::placeholder{color:var(--text-faint)}

.bm-remove-btn{width:22px;height:22px;border-radius:50%;background:rgba(239,68,68,.06);border:1px solid rgba(239,68,68,.15);color:#fca5a5;display:flex;align-items:center;justify-content:center;font-size:.8rem;cursor:pointer;flex-shrink:0;transition:all var(--transition)}
.bm-remove-btn:hover{background:rgba(239,68,68,.18)}

/* ADD ROW */
.add-row{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}
.add-btn{display:inline-flex;align-items:center;gap:5px;padding:7px 14px;border-radius:var(--radius-sm);font-size:.8rem;font-weight:700;cursor:pointer;border:1.5px dashed var(--border);color:var(--text-muted);background:transparent;transition:all var(--transition)}
.add-btn:hover{border-color:var(--primary);color:var(--primary);background:rgba(245,158,11,.05)}
.add-btn svg{width:13px;height:13px;stroke:currentColor;fill:none;stroke-width:2.5;stroke-linecap:round}

/* TOOLBAR */
.bm-toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.tb-btn{display:inline-flex;align-items:center;gap:5px;padding:6px 13px;border-radius:var(--radius-sm);font-size:.8rem;font-weight:700;cursor:pointer;transition:all var(--transition);border:1px solid transparent;white-space:nowrap}
.tb-btn svg{width:13px;height:13px;stroke:currentColor;fill:none;stroke-linecap:round}
.tb-primary{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#0f0f14;border:none}
.tb-primary:hover{opacity:.88}
.tb-ghost{background:rgba(255,255,255,.05);border-color:var(--border);color:var(--text-muted)}
.tb-ghost:hover{color:var(--text);border-color:rgba(255,255,255,.18);background:rgba(255,255,255,.08)}
.tb-danger{background:rgba(239,68,68,.08);border-color:rgba(239,68,68,.2);color:#fca5a5}
.tb-danger:hover{background:rgba(239,68,68,.15)}

/* PREVIEW PANEL */
.preview-scroll{max-height:480px;overflow-y:auto;padding:6px 0}
.preview-entry{display:flex;align-items:baseline;gap:6px;padding:5px 0;border-bottom:1px solid rgba(255,255,255,.03)}
.preview-entry:last-child{border-bottom:none}
.preview-dots{flex:1;border-bottom:1px dotted var(--text-faint);min-width:20px;margin:0 4px}
.preview-page{font-size:.78rem;font-family:'Fira Code',monospace;color:var(--text-faint);white-space:nowrap}
.preview-title{font-size:.82rem;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:180px}
.preview-empty{text-align:center;color:var(--text-faint);font-size:.82rem;padding:24px 0}

/* INFO CARD */
.info-row{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid var(--border);font-size:.82rem}
.info-row:last-child{border-bottom:none}
.info-label{color:var(--text-faint)}
.info-val{color:var(--text);font-weight:600;font-family:'Fira Code',monospace}

/* PROGRESS */
.progress-wrap{margin-top:16px}
.progress-label{font-size:.78rem;color:var(--text-muted);margin-bottom:6px}
.progress-bar{height:6px;border-radius:3px;background:rgba(255,255,255,.06);overflow:hidden}
.progress-fill{height:100%;border-radius:3px;background:linear-gradient(90deg,var(--primary),var(--secondary));transition:width .4s ease}

/* SECTIONS */
.page-section{margin-top:clamp(32px,4vw,56px)}
.section-head{margin-bottom:20px}
.section-title{font-size:1.35rem;font-weight:800;letter-spacing:-.02em;margin-bottom:6px}
.section-desc{font-size:.88rem;color:var(--text-muted);line-height:1.7}
.section-divider{height:1px;background:var(--border);margin:clamp(32px,4vw,56px) 0}

.steps-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.step-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:18px}
.step-number{width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:800;color:#0f0f14;margin-bottom:12px}
.step-title{font-size:.9rem;font-weight:700;margin-bottom:6px}
.step-desc{font-size:.82rem;color:var(--text-muted);line-height:1.65}

.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.feature-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px}
.feature-icon{font-size:1.4rem;margin-bottom:10px}
.feature-title{font-size:.88rem;font-weight:700;margin-bottom:5px}
.feature-desc{font-size:.8rem;color:var(--text-muted);line-height:1.6}

/* FAQ */
.faq-list{display:flex;flex-direction:column;gap:10px}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden}
.faq-q{width:100%;padding:14px 18px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:.92rem;font-weight:600;color:var(--text);text-align:left;transition:background var(--transition)}
.faq-q:hover{background:rgba(255,255,255,.025)}
.faq-icon{width:20px;height:20px;border-radius:50%;border:1.5px solid var(--border);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:.82rem;color:var(--text-faint);transition:transform var(--transition)}
.faq-item.open .faq-icon{transform:rotate(45deg);border-color:var(--primary);color:var(--primary)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease,padding .25s ease}
.faq-item.open .faq-a{max-height:400px;padding:0 18px 14px}
.faq-a p{font-size:.88rem;color:var(--text-muted);line-height:1.78}
.faq-a code{background:rgba(245,158,11,.1);color:#fcd34d;padding:1px 5px;border-radius:4px;font-family:'Fira Code',monospace;font-size:.85em}

/* RELATED */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.related-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px;display:flex;flex-direction:column;gap:8px;transition:all var(--transition)}
.related-card:hover{border-color:rgba(245,158,11,.35);transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.3)}
.related-icon{width:36px;height:36px;border-radius:9px;display:flex;align-items:center;justify-content:center}
.related-icon svg{width:18px;height:18px;color:#fff}
.related-name{font-size:.88rem;font-weight:700}
.related-desc{font-size:.78rem;color:var(--text-muted);line-height:1.5;flex:1}
.related-link{font-size:.78rem;font-weight:600;color:var(--primary)}

/* AD */
.ad-slot{background:var(--bg-card);border:1px dashed rgba(255,255,255,.06);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--text-faint);font-size:.75rem;min-height:90px}

/* TOAST */
.toast{position:fixed;bottom:28px;right:28px;padding:11px 20px;background:#1e1e28;border:1px solid rgba(245,158,11,.4);border-radius:var(--radius-md);font-size:.85rem;font-weight:600;color:#fcd34d;box-shadow:0 8px 32px rgba(0,0,0,.4);opacity:0;transform:translateY(10px);transition:all .25s ease;pointer-events:none;z-index:999}
.toast.show{opacity:1;transform:translateY(0)}

/* EMPTY STATE */
.empty-state{padding:40px 20px;text-align:center;color:var(--text-faint)}
.empty-state-icon{font-size:2.4rem;margin-bottom:10px}
.empty-state p{font-size:.88rem;line-height:1.7}

/* FOOTER */
.site-footer{background:var(--bg-surface);border-top:1px solid var(--border);padding:clamp(28px,4vw,48px) 0 20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:36px;width:100%;max-width:1280px;margin-inline:auto;padding-inline:clamp(16px,4vw,48px)}
.footer-brand-text{font-size:.88rem;color:var(--text-muted);line-height:1.7;margin-top:10px;max-width:240px}
.footer-heading{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--text-faint);margin-bottom:12px}
.footer-links{display:flex;flex-direction:column;gap:8px}
.footer-links a{font-size:.88rem;color:var(--text-muted);transition:color var(--transition)}
.footer-links a:hover{color:var(--text)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:20px;border-top:1px solid var(--border);flex-wrap:wrap;gap:10px;font-size:.82rem;color:var(--text-faint);width:100%;max-width:1280px;margin-inline:auto;padding-inline:clamp(16px,4vw,48px)}

@media(max-width:640px){.footer-grid{grid-template-columns:1fr}}