:root{--bg: #020817;--panel: #0f172a;--panel-alt: #111827;--primary: #38bdf8;--primary-strong: #0ea5e9;--secondary: #1f2937;--text: #e2e8f0;--muted: #94a3b8;--accent: #a78bfa;--shadow: rgba(15, 23, 42, .45)}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%;height:100%;background:linear-gradient(180deg,#020817,#0f172a);color:var(--text);font-family:Noto Sans JP,Segoe UI,sans-serif}body{overscroll-behavior:none}button,select,textarea{font:inherit}.app-shell{min-height:100vh;display:flex;flex-direction:column;padding:max(20px,env(safe-area-inset-top)) 18px max(24px,env(safe-area-inset-bottom));gap:18px;max-width:1000px;margin:0 auto}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:8px 2px}.eyebrow{margin:0 0 4px;color:var(--primary);font-size:.75rem;letter-spacing:.08em;text-transform:uppercase}h1{margin:0;font-size:clamp(1.7rem,4vw,2.6rem)}.connection-badge{border:1px solid 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768px){.controls{grid-template-columns:1fr}}.direction-toggle{width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:16px 20px;border:1px solid rgba(56,189,248,.35);border-radius:16px;background:#0ea5e91a;color:#e2e8f0;font-size:clamp(1rem,2.5vw,1.25rem)}.direction-toggle strong{color:#38bdf8;font-size:.85em;letter-spacing:.06em}.mode-row{display:grid;grid-template-columns:minmax(150px,.32fr) 1fr;gap:12px}.auto-toggle{border:1px solid rgba(52,211,153,.4);font-weight:800;letter-spacing:.06em}.auto-on{background:#34d39929;color:#6ee7b7}.auto-off{background:#94a3b81f;color:#cbd5e1}.dual-subtitle-area{flex:1;min-height:320px;display:grid;grid-template-columns:1fr 1fr;gap:14px}.translation-pane{min-width:0;padding:20px;border-radius:22px;border:1px solid rgba(148,163,184,.14);background:#020817b8;display:flex;flex-direction:column;transition:border-color .2s ease,background .2s ease,transform .2s 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