:root{--bg-page: #f4f4f6;--bg-card: #ffffff;--bg-subtle: #f8f8fa;--bg-dark: #0f172a;--bg-header: rgba(255, 255, 255, .96);--border-light: #e4e4e7;--border-strong: #d4d4d8;--border-ink: #18181b;--text-primary: #09090b;--text-secondary: #52525b;--text-muted: #71717a;--accent-ink: #09090b;--accent-emerald: #059669;--accent-emerald-bg: #ecfdf5;--accent-emerald-border: #6ee7b7;--accent-blue: #0052cc;--color-success: #047857;--color-success-bg: #ecfdf5;--color-success-border: #6ee7b7;--color-warning: #b45309;--color-warning-bg: #fffbeb;--color-warning-border: #fcd34d;--color-danger: #b91c1c;--color-danger-bg: #fef2f2;--color-danger-border: #fca5a5;--color-info: #1d4ed8;--color-info-bg: #eff6ff;--color-info-border: #93c5fd;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--font-mono: "JetBrains Mono", "SF Mono", "Menlo", "Consolas", monospace;--radius-lg: 4px;--radius-md: 3px;--radius-sm: 2px;--shadow-hard: 0 1px 3px rgba(9, 9, 11, .06)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-page);background-image:linear-gradient(to right,rgba(24,24,27,.035) 1px,transparent 1px),linear-gradient(to bottom,rgba(24,24,27,.035) 1px,transparent 1px);background-size:24px 24px;color:var(--text-primary);font-family:var(--font-sans);line-height:1.5;min-height:100vh;padding-bottom:64px;-webkit-font-smoothing:antialiased}.container{max-width:1380px;margin:0 auto;padding:0 24px}.top-header{position:sticky;top:0;z-index:50;background:var(--bg-header);backdrop-filter:blur(8px);border-bottom:2px solid var(--border-ink);padding:14px 0;margin-bottom:20px}.header-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}.brand-link{text-decoration:none;color:inherit}.brand{display:flex;align-items:center;gap:12px}.brand-logo{width:38px;height:38px;border-radius:var(--radius-sm);background:var(--bg-dark);border:1px solid var(--border-ink);display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:14px;font-weight:800;color:#10b981;letter-spacing:-.04em}.brand-title h1,.brand-heading{font-size:1.15rem;font-weight:800;letter-spacing:-.02em;display:flex;align-items:center;gap:8px;color:var(--text-primary)}.badge-version{font-family:var(--font-mono);font-size:.68rem;font-weight:700;padding:2px 6px;border-radius:var(--radius-sm);background:var(--color-success-bg);color:var(--color-success);border:1px solid var(--color-success-border);text-transform:uppercase;letter-spacing:.04em}.brand-subtitle{font-size:.78rem;color:var(--text-secondary);margin-top:2px}.header-controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.privacy-pill{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:.74rem;font-weight:700;padding:6px 10px;border-radius:var(--radius-sm);background:var(--color-success-bg);color:var(--color-success);border:1px solid var(--color-success-border)}.privacy-dot{width:7px;height:7px;border-radius:50%;background:#10b981}.lang-switch-wrap{display:inline-flex;align-items:center;gap:6px;background:var(--bg-card);border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:4px 8px;font-size:.78rem}.lang-select{border:none;background:transparent;color:var(--text-primary);font-family:var(--font-sans);font-size:.78rem;font-weight:600;cursor:pointer;outline:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 14px;font-family:var(--font-sans);font-size:.82rem;font-weight:700;border-radius:var(--radius-sm);cursor:pointer;transition:all .15s ease;border:1px solid var(--border-ink);white-space:nowrap}.btn-link-clean{text-decoration:none}.btn-primary{background:var(--text-primary);color:#fff;border-color:var(--border-ink)}.btn-primary:hover:not(:disabled){background:#27272a}.btn-emerald{background:var(--accent-emerald);color:#fff;border-color:#047857}.btn-emerald:hover:not(:disabled){background:#047857}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border-color:var(--border-strong)}.btn-secondary:hover:not(:disabled){background:var(--bg-subtle);border-color:var(--border-ink)}.btn:disabled{opacity:.5;cursor:not-allowed}.principles-callout-card{background:var(--bg-card);border:1.5px solid var(--border-ink);border-radius:var(--radius-md);padding:18px 22px;margin-bottom:20px;display:flex;align-items:center;justify-content:space-between;gap:20px;box-shadow:var(--shadow-hard)}.principles-callout-body{flex:1}.principles-callout-title{font-size:1rem;font-weight:800;margin-bottom:6px;color:var(--text-primary)}.intro-copy{font-size:.85rem;color:var(--text-secondary);line-height:1.6;margin-bottom:6px}.content-lead{font-size:.82rem;color:var(--text-muted);line-height:1.55}.mode-tabs-bar{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:20px}.mode-tab{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:14px 18px;background:var(--bg-card);border:1.5px solid var(--border-strong);border-radius:var(--radius-md);cursor:pointer;text-align:left;transition:all .15s ease}.mode-tab:hover{border-color:var(--border-ink);background:var(--bg-subtle)}.mode-tab.active{background:var(--bg-dark);color:#fff;border-color:var(--bg-dark);box-shadow:0 3px 10px #0f172a2e}.mode-tab-left{display:flex;align-items:center;gap:12px}.mode-tab-icon{font-size:1.35rem}.mode-tab-title{font-size:.94rem;font-weight:800;display:block}.mode-tab-sub{font-size:.74rem;opacity:.78;font-family:var(--font-mono);display:block;margin-top:2px}.mode-tab-badge{font-family:var(--font-mono);font-size:.68rem;font-weight:700;padding:3px 8px;border-radius:var(--radius-sm);background:#10b98126;color:#059669;border:1px solid rgba(16,185,129,.35)}.mode-tab.active .mode-tab-badge{background:#10b98138;color:#34d399;border-color:#34d39973}.hero-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:18px;margin-bottom:20px}.card{background:var(--bg-card);border:1.5px solid var(--border-ink);border-radius:var(--radius-md);padding:20px;box-shadow:var(--shadow-hard)}.card-col-5{grid-column:span 5}.card-col-7{grid-column:span 7}.card-col-12{grid-column:span 12}.card-header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--border-light)}.card-title{font-size:1rem;font-weight:800;color:var(--text-primary)}.card-subtitle{font-size:.78rem;color:var(--text-secondary);margin-top:2px}.dropzone{border:2px dashed var(--border-strong);border-radius:var(--radius-md);background:var(--bg-subtle);padding:22px 16px;text-align:center;cursor:pointer;transition:all .15s ease;margin-bottom:14px}.dropzone:hover,.dropzone.dragover{border-color:var(--accent-emerald);background:var(--accent-emerald-bg)}.dropzone-icon{font-size:1.8rem;margin-bottom:6px}.dropzone-title{font-size:.88rem;font-weight:700;color:var(--text-primary)}.dropzone-hint{font-size:.75rem;color:var(--text-muted);font-family:var(--font-mono);margin-top:4px}.sample-bar{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap;margin-bottom:16px;padding:10px 12px;background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--radius-sm)}.sample-bar-label{font-size:.76rem;font-weight:600;color:var(--text-secondary)}.codec-controls{display:flex;flex-direction:column;gap:14px}.control-group{display:flex;flex-direction:column;gap:6px}.control-label-row{display:flex;align-items:center;justify-content:space-between;font-size:.8rem;font-weight:700;color:var(--text-primary)}.control-val{font-family:var(--font-mono);font-size:.76rem;font-weight:700;color:var(--accent-emerald);background:var(--accent-emerald-bg);padding:1px 7px;border-radius:var(--radius-sm);border:1px solid var(--accent-emerald-border)}.control-select,.control-range{width:100%}.control-select{padding:8px 10px;font-family:var(--font-sans);font-size:.82rem;font-weight:600;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--bg-card);color:var(--text-primary)}.control-range{accent-color:var(--accent-emerald);cursor:pointer}.checkbox-row{display:flex;align-items:center;gap:8px;font-size:.8rem;font-weight:600;color:var(--text-secondary);cursor:pointer}.action-row{display:flex;gap:10px;margin-top:8px}.action-row .btn{flex:1;padding:10px 14px}.telemetry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:16px}.metric-box{background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--radius-sm);padding:10px 12px}.metric-box.highlight{background:var(--color-success-bg);border-color:var(--color-success-border)}.metric-label{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--text-muted)}.metric-value{font-family:var(--font-mono);font-size:1.05rem;font-weight:800;color:var(--text-primary);margin-top:3px}.metric-box.highlight 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25%),linear-gradient(-45deg,#1e293b 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#1e293b 75%),linear-gradient(-45deg,transparent 75%,#1e293b 75%);background-size:16px 16px;background-position:0 0,0 8px,8px -8px,-8px 0;border-radius:2px;overflow:hidden}.canvas-holder canvas,.canvas-holder img,.canvas-holder video{max-width:100%;max-height:206px;object-fit:contain}.waveform-canvas{width:100%;height:150px;background:#0f172a;border:1px solid #1e293b;border-radius:2px;display:block}.audio-players-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}.audio-player-box{background:#111827;border:1px solid #1e293b;border-radius:2px;padding:8px 10px}.audio-player-box label{display:block;font-family:var(--font-mono);font-size:.72rem;color:#94a3b8;margin-bottom:6px}.audio-player-box audio{width:100%;height:32px}.status-footer-bar{margin-top:12px;padding-top:10px;border-top:1px solid #1e293b;display:flex;align-items:center;justify-content:space-between;gap:12px;font-family:var(--font-mono);font-size:.74rem;color:#cbd5e1}.progress-bar-wrap{width:160px;height:7px;background:#1e293b;border-radius:999px;overflow:hidden}.progress-bar-fill{height:100%;width:100%;background:#10b981;transition:width .2s ease}.section-heading{font-size:1.05rem;font-weight:800;margin:24px 0 12px;color:var(--text-primary)}.principles-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-bottom:24px}.principle-card{background:var(--bg-card);border:1.5px solid var(--border-ink);border-radius:var(--radius-md);padding:18px;display:flex;flex-direction:column;gap:10px}.principle-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}.principle-card h2{font-size:.95rem;font-weight:800;color:var(--text-primary)}.principle-card p{font-size:.83rem;color:var(--text-secondary);line-height:1.6}.tag{font-family:var(--font-mono);font-size:.68rem;font-weight:700;padding:2px 7px;border-radius:var(--radius-sm);white-space:nowrap}.tag-info{background:var(--color-info-bg);color:var(--color-info);border:1px solid var(--color-info-border)}.formula-box{font-family:var(--font-mono);font-size:.74rem;padding:8px 10px;background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--radius-sm);color:var(--text-primary);overflow-x:auto}.seo-steps-grid{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.seo-step-box{background:var(--bg-subtle);border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:14px 16px}.seo-step-box h3{font-size:.88rem;font-weight:800;margin-bottom:6px;color:var(--text-primary)}.seo-step-box p{font-size:.8rem;color:var(--text-secondary);line-height:1.55}.faq-list{display:flex;flex-direction:column;gap:10px;margin-top:12px}.faq-item{border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--bg-subtle);padding:12px 16px}.faq-item summary{font-size:.88rem;font-weight:800;cursor:pointer;color:var(--text-primary)}.faq-item p{font-size:.82rem;color:var(--text-secondary);line-height:1.6;margin-top:8px}.promo-showcase{margin-top:20px;margin-bottom:24px}.llmland-ad-frame{width:100%;height:280px;border:none;display:block;border-radius:12px;background:transparent}.site-footer{border-top:1px solid var(--border-strong);padding-top:18px;margin-top:24px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;font-size:.78rem;color:var(--text-secondary)}.footer-links{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.footer-links a{color:var(--text-secondary);text-decoration:none;font-weight:600}.footer-links a:hover{color:var(--text-primary);text-decoration:underline}.hidden{display:none!important}@media(max-width:980px){.mode-tabs-bar,.seo-steps-grid,.principles-grid{grid-template-columns:1fr}.card-col-5,.card-col-7{grid-column:span 12}.telemetry-grid{grid-template-columns:repeat(2,1fr)}.preview-compare-grid,.audio-players-row{grid-template-columns:1fr}.principles-callout-card{flex-direction:column;align-items:flex-start}.llmland-ad-frame{height:440px}}