:root{--primary:#667eea;--secondary:#764ba2;--gradient:linear-gradient(135deg,#667eea 0%,#764ba2 100%);--bg:#f7f8fc;--text:#1a202c;--text-soft:#4a5568;--text-muted:#718096;--border:#e2e8f0;--success:#38a169;--error:#e53e3e;--warning:#d69e2e;--shadow:0 4px 12px rgba(0,0,0,.08);--shadow-lg:0 10px 30px rgba(0,0,0,.10)}*{margin:0;padding:0;box-sizing:border-box}html,body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);font-size:15px;line-height:1.6}h1,h2,h3{font-family:'Poppins',sans-serif}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:1400px;margin:0 auto;padding:0 32px}.topbar{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:68px}.brand{display:flex;align-items:center;gap:12px;color:var(--text)}.brand-icon{width:40px;height:40px;background:var(--gradient);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:16px;font-family:'Poppins',sans-serif}.brand-name{font-family:'Poppins',sans-serif;font-weight:700;font-size:16px}.brand-tag{font-size:11px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em}.main-nav{display:flex;align-items:center;gap:8px}.main-nav a{padding:8px 14px;border-radius:8px;color:var(--text-soft);font-weight:500;font-size:14px}.main-nav a:hover{background:#edf2f7}.main-nav .nav-external{color:var(--text-soft);font-size:13px;padding:7px 11px;border-radius:8px;white-space:nowrap}.main-nav .nav-external:hover{background:rgba(102,126,234,.08);color:var(--primary);text-decoration:none}.nav-btn{background:var(--gradient);color:#fff;padding:9px 20px;border-radius:9px;box-shadow:0 4px 12px rgba(102,126,234,.3)}.nav-btn:hover{color:#fff;transform:translateY(-1px);text-decoration:none}.main-content{flex:1;padding:48px 0;min-height:calc(100vh - 68px - 80px)}.footer{background:#fff;border-top:1px solid var(--border);padding:24px 0;margin-top:auto}.footer-inner{display:flex;justify-content:space-between;color:var(--text-muted);font-size:13px;flex-wrap:wrap;gap:12px}.hero{background:var(--gradient);border-radius:24px;padding:64px 48px;color:#fff;position:relative;overflow:hidden;margin-bottom:40px}.hero h1{color:#fff;font-size:42px;line-height:1.15;margin-bottom:16px;font-weight:800}.hero p{font-size:17px;opacity:.92;margin-bottom:28px;max-width:600px}.btn-hero-primary{background:#fff;color:var(--primary);padding:14px 28px;border-radius:10px;font-weight:600;font-size:15px;display:inline-flex;align-items:center;gap:8px}.btn-hero-primary:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(0,0,0,.15);text-decoration:none;color:var(--primary)}.btn-hero-secondary{background:rgba(255,255,255,.15);color:#fff;padding:14px 28px;border-radius:10px;font-weight:600;font-size:15px;border:1.5px solid rgba(255,255,255,.4)}.btn-hero-secondary:hover{background:rgba(255,255,255,.25);text-decoration:none;color:#fff}.fw-layout{display:grid;grid-template-columns:320px 1fr;gap:20px;align-items:start}.tree-panel{background:#fff;border:1px solid var(--border);border-radius:12px;overflow:hidden}.tree-header{padding:14px 18px;background:var(--gradient);color:#fff;font-weight:600;font-size:14px;display:flex;justify-content:space-between;align-items:center}.tree-search{padding:10px 14px;border-bottom:1px solid var(--border)}.tree-search input{width:100%;padding:8px 12px;border:1.5px solid var(--border);border-radius:8px;font-size:13px}.tree-list{padding:4px 0}.tree-folder{margin-bottom:2px}.tree-folder-header{padding:8px 14px;cursor:pointer;font-weight:600;font-size:13px;color:var(--text);display:flex;align-items:center;gap:6px;transition:all .15s;user-select:none}.tree-folder-header:hover{background:var(--bg)}.tree-folder-header .arrow{transition:transform .2s;font-size:9px;width:12px;text-align:center}.tree-folder.collapsed .arrow{transform:rotate(-90deg)}.tree-folder.collapsed .tree-folder-content{display:none}.tree-folder-header .count{margin-left:auto;font-size:10px;color:var(--text-muted);background:var(--bg);padding:1px 7px;border-radius:10px}.tree-file{padding:7px 14px;cursor:pointer;font-size:13px;color:var(--text-soft);display:flex;align-items:center;gap:6px;transition:all .15s;border-left:2px solid transparent}.tree-file:hover{background:var(--bg);color:var(--text)}.tree-file.active{background:rgba(102,126,234,.1);color:var(--primary);border-left-color:var(--primary);font-weight:600}.tree-file .file-icon{font-size:10px;width:12px;text-align:center;flex-shrink:0}.tree-file .file-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tree-file .size{font-size:10px;color:var(--text-muted);flex-shrink:0}.fw-detail{background:#fff;border:1px solid var(--border);border-radius:12px;padding:28px}.fw-detail h1{font-size:22px;margin-bottom:8px}.fw-meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px;font-size:13px;color:var(--text-muted)}.fw-desc{background:var(--bg);padding:14px;border-radius:8px;font-size:14px;line-height:1.6;color:var(--text-soft);white-space:pre-wrap;margin-top:12px}.fw-download{background:var(--gradient);color:#fff;padding:16px 32px;border-radius:10px;font-weight:600;font-size:16px;display:inline-flex;align-items:center;gap:8px;text-decoration:none;margin-top:16px}.fw-download:hover{color:#fff;transform:translateY(-2px);box-shadow:0 8px 24px rgba(102,126,234,.35);text-decoration:none}.placeholder{background:#fff;border:2px dashed var(--border);border-radius:12px;padding:60px 24px;text-align:center;color:var(--text-muted)}.placeholder-icon{font-size:64px;margin-bottom:16px;opacity:.3}.flash{display:flex;align-items:flex-start;gap:12px;padding:14px 18px;border-radius:12px;margin-bottom:24px;font-size:14px}.flash-success{background:#f0fff4;color:#22543d;border:1px solid #9ae6b4}.flash-error{background:#fff5f5;color:#742a2a;border:1px solid #feb2b2}.flash-warning{background:#fffaf0;color:#744210;border:1px solid #fbd38d}.flash-info{background:#ebf8ff;color:#2a4365;border:1px solid #90cdf4}.pill{display:inline-block;padding:4px 10px;border-radius:999px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.04em}.pill-primary{background:rgba(102,126,234,.1);color:var(--primary)}.pill-green{background:#f0fff4;color:#22543d}.auth-page{min-height:calc(100vh - 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