:root { --bg: #0f3d40; --card: #ffffff; --ink: #142326; --accent: #d9a441; --muted: #5d6f72; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: #fff; font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom); }
.duo-head { display: flex; align-items: center; gap: 10px; padding: 18px 18px 6px; }
.duo-head h1 { font-size: 1.25rem; margin: 0; }
main { padding: 0 16px 40px; max-width: 520px; margin: 0 auto; }
.duo-intro, .duo-help { color: rgba(255, 255, 255, .78); font-size: .92rem; }
.duo-list { list-style: none; padding: 0; margin: 16px 0; display: grid; gap: 12px; }
.duo-list li { background: var(--card); color: var(--ink); border-radius: 18px; padding: 14px 16px; display: grid; grid-template-columns: 1fr auto auto; grid-template-rows: auto auto; gap: 2px 12px; align-items: center; position: relative; }
.duo-meta { grid-column: 1 / 3; display: flex; flex-direction: column; }
.duo-meta span { color: var(--muted); font-size: .85rem; word-break: break-all; }
.duo-code { grid-column: 1 / 2; grid-row: 2; font: 700 2.1rem/1.1 ui-monospace, "SF Mono", Menlo, monospace; letter-spacing: .08em; color: var(--bg); background: none; border: 0; padding: 4px 0; text-align: left; cursor: pointer; }
.duo-code.copied { color: #1f7a5a; }
.ending .duo-code { color: #b3362c; }
.duo-ring { grid-column: 2; grid-row: 2; width: 34px; height: 34px; transform: rotate(-90deg); }
.duo-ring circle { fill: none; stroke: var(--accent); stroke-width: 4; stroke-dasharray: 94.2; transition: stroke-dashoffset 1s linear; }
.duo-del { grid-column: 3; grid-row: 1 / 3; background: none; border: 0; color: #9aa7a9; font-size: 1.5rem; cursor: pointer; padding: 4px 8px; }
.duo-empty { background: rgba(255, 255, 255, .08); border-radius: 14px; padding: 16px; }
.duo-add { background: rgba(255, 255, 255, .08); border-radius: 14px; padding: 12px 16px; }
.duo-add summary { cursor: pointer; font-weight: 600; }
.duo-add label { display: block; margin: 12px 0; font-size: .9rem; }
.duo-add input { display: block; width: 100%; margin-top: 6px; padding: 12px; border-radius: 10px; border: 0; font-size: 1rem; }
.duo-btn { display: block; width: 100%; margin: 12px 0 4px; padding: 13px; border: 0; border-radius: 12px; background: var(--accent); color: #1d1a10; font-weight: 700; font-size: 1rem; cursor: pointer; }
video { width: 100%; border-radius: 12px; margin-top: 10px; }