:root{--bg: #f7f7f8;--surface: #ffffff;--surface-2: #f0f0f1;--border: #e2e2e6;--text: #17171a;--text-dim: #6b6b72;--accent: #6d5ef7;--accent-2: #5b4bd6;--danger: #e5484d;--surface-hi: #ffffff}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg: #0b0b0d;--surface: #17171a;--surface-2: #1f1f23;--border: #2a2a2e;--text: #f2f2f3;--text-dim: #9a9aa1;--accent: #6d5ef7;--accent-2: #9d8dfd;--danger: #ff6b6b;--surface-hi: #26262c}}:root[data-theme=dark]{--bg: #0b0b0d;--surface: #17171a;--surface-2: #1f1f23;--border: #2a2a2e;--text: #f2f2f3;--text-dim: #9a9aa1;--accent: #6d5ef7;--accent-2: #9d8dfd;--danger: #ff6b6b;--surface-hi: #26262c}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;zoom:1.2}#root{min-height:100vh;display:flex;flex-direction:column}a{color:var(--accent-2)}.site-header{display:flex;align-items:center;justify-content:space-between;padding:clamp(16px,4vw,28px) clamp(16px,5vw,48px)}.theme-toggle{display:flex;gap:2px;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:3px;flex-shrink:0}.theme-toggle button{width:28px;height:28px;display:flex;align-items:center;justify-content:center;border:none;border-radius:7px;background:transparent;color:var(--text-dim);cursor:pointer}.theme-toggle button.active{background:var(--surface-2);color:var(--accent-2)}.theme-toggle svg{width:16px;height:16px}.brand{display:flex;align-items:center;gap:10px;color:inherit;text-decoration:none}.brand svg{color:var(--accent-2);flex-shrink:0}.brand-name{font-weight:700;font-size:1.15rem;letter-spacing:-.02em}main{flex:1;width:100%;max-width:640px;margin:0 auto;padding:clamp(24px,6vw,48px) clamp(16px,5vw,24px) 64px}.hero{text-align:center;margin-bottom:clamp(28px,6vw,40px)}.hero h1{font-size:clamp(1.7rem,5vw,2.4rem);line-height:1.3;letter-spacing:-.02em;margin:0 0 12px}.convert-form{margin-bottom:8px}.input-with-hints{display:flex;flex-direction:column;gap:24px}.input-row{display:flex;flex:1;min-width:0;gap:8px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:6px}.url-hints{display:flex;align-items:center;justify-content:center;gap:14px;opacity:.7}.url-hints svg{display:block;width:50%;height:auto;aspect-ratio:160 / 150}.input-row input{flex:1;min-width:0;border:none;background:transparent;color:var(--text);font-size:1rem;padding:12px 14px;outline:none}.input-row input::placeholder{color:var(--text-dim)}.input-row button{flex-shrink:0;border:none;border-radius:12px;padding:0 20px;font-size:.95rem;font-weight:600;color:#fff;background:linear-gradient(135deg,var(--accent-2),var(--accent));cursor:pointer}.input-row button:disabled{opacity:.6;cursor:default}.hint{color:var(--text-dim);font-size:.82rem;line-height:1.6;margin:12px 4px 0}.error{margin-top:20px;padding:12px 14px;border-radius:12px;background:#ff6b6b1f;border:1px solid rgba(255,107,107,.35);color:var(--danger);font-size:.9rem}.result{margin-top:32px;padding:clamp(18px,4vw,24px);background:var(--surface);border:1px solid var(--border);border-radius:18px}.result-title{font-size:1.2rem;margin:0 0 4px}.result-meta{color:var(--text-dim);font-size:.88rem;margin:0 0 20px}.notice{margin:0 0 20px;padding:10px 14px;border-radius:12px;background:#9d8dfd1f;border:1px solid rgba(157,141,253,.35);color:var(--text);font-size:.85rem;line-height:1.6}.result-section-label{font-size:.85rem;color:var(--text-dim);margin:0 0 10px}.watch-links{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.watch-links a{display:flex;align-items:center;gap:12px;padding:8px 16px 8px 8px;border-radius:12px;background:var(--surface-2);border:1px solid var(--border);color:var(--text);text-decoration:none;font-size:.92rem}.watch-link-thumb{width:96px;height:54px;object-fit:cover;border-radius:8px;background:var(--surface);flex-shrink:0}.watch-link-label{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.watch-link-open{flex-shrink:0;color:var(--text-dim);font-size:.85rem}.watch-links a:hover{border-color:var(--accent)}.note{margin:16px 0 0;color:var(--text-dim);font-size:.82rem;line-height:1.6}.site-footer{text-align:center;padding:24px 16px 32px;color:var(--text-dim);font-size:.8rem;line-height:1.7}.site-footer a{color:var(--text-dim)}.guide-links{margin:0 0 12px}.home-faq{margin-top:40px}.home-faq h2{font-size:1.15rem;margin:0 0 12px}.mobile-flow-section{margin-top:36px;text-align:center}.mobile-flow-section h2{font-size:1.05rem;margin:0 0 8px}.mobile-flow-lede{color:var(--text-dim);font-size:.85rem;line-height:1.6;margin:0 0 20px}.mobile-flow{display:flex;align-items:flex-start;justify-content:center;flex-wrap:wrap;row-gap:16px}.mobile-flow-step-wrap{display:flex;align-items:flex-start}.mobile-flow-step{display:flex;flex-direction:column;align-items:center;width:108px;gap:8px}.mobile-flow-icon{width:36px;height:36px;display:flex;align-items:center;justify-content:center;color:var(--accent-2)}.mobile-flow-icon svg{width:32px;height:32px}.mobile-flow-label{font-size:.76rem;color:var(--text-dim);line-height:1.4}.mobile-flow-arrow{display:flex;align-items:center;height:36px;margin:0 2px;flex-shrink:0}.mobile-flow-arrow svg{width:18px;height:18px}@media(max-width:640px){.mobile-flow{flex-direction:column;align-items:center;row-gap:4px}.mobile-flow-step-wrap{flex-direction:column;align-items:center}.mobile-flow-arrow{height:auto;margin:2px 0}.mobile-flow-arrow svg{transform:rotate(90deg)}}.guide{max-width:640px;margin:0 auto;padding:clamp(24px,6vw,48px) clamp(16px,5vw,24px) 64px}.guide h1{font-size:clamp(1.5rem,4vw,2rem);line-height:1.3;letter-spacing:-.02em;margin:0 0 16px}.guide h2{font-size:1.15rem;margin:32px 0 12px}.guide p{line-height:1.7}.guide .lede{color:var(--text-dim);font-size:1.02rem}.guide-steps{padding-left:20px;line-height:1.8}.guide-cta{display:inline-block;margin-top:8px;padding:12px 22px;border-radius:12px;font-weight:600;color:#fff;background:linear-gradient(135deg,var(--accent-2),var(--accent));text-decoration:none}.guide-hints{display:flex;justify-content:center;margin:24px 0}.guide-hints svg{width:55%;max-width:220px;height:auto;opacity:.85}.faq-item{border-top:1px solid var(--border);padding:16px 0}.faq-item:last-child{border-bottom:1px solid var(--border)}.faq-item h3{font-size:.98rem;margin:0 0 6px}.faq-item p{margin:0;color:var(--text-dim);font-size:.92rem}