:root{--bg:#f4f2ec;--surface:#fffdf8;--ink:#1d2733;--muted:#5d6b7a;--border:#ddd6c8;--accent:#0e7c66;--accent-ink:#ffffff;--danger:#b3402f;--danger-soft:#f7e4e0;--success-soft:#e0f0ea;--card-shadow:0 1px 2px rgba(29,39,51,0.06),0 8px 24px rgba(29,39,51,0.08);--radius:14px}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--ink);font-family:Avenir Next,Segoe UI,Helvetica,Arial,sans-serif;line-height:1.5;min-height:100vh}.wrap{max-width:760px;margin:0 auto;padding:32px 20px 64px}header.top{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:28px}h1{font-size:1.45rem;letter-spacing:-.01em}h1 span{color:var(--accent)}.subtitle{color:var(--muted);font-size:.9rem}.toggle{display:inline-flex;background:#e9e5da;border-radius:999px;padding:4px;gap:2px}.toggle button{border:0;background:transparent;padding:8px 16px;border-radius:999px;font:inherit;font-size:.85rem;color:var(--muted);cursor:pointer;transition:background 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8px;min-height:36px}.quit:hover{color:var(--danger)}.bar{height:6px;background:#e4dfd2;overflow:hidden;margin-bottom:24px}.bar,.bar-fill{border-radius:999px}.bar-fill{height:100%;width:0;background:var(--accent);transition:width .3s ease}.flip-scene{perspective:1400px;cursor:pointer;-webkit-tap-highlight-color:transparent}.flip-card{position:relative;min-height:320px;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.4,.2,.2,1)}.flip-scene.flipped .flip-card{transform:rotateY(180deg)}.flip-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--card-shadow);padding:48px 36px 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