:root{--font:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--radius:16px;--radius-sm:10px;--gap:12px}.app{flex-direction:column;min-height:100vh;display:flex}.app.dark{--bg:#0f1115;--surface:#1a1d24;--surface-2:#232833;--text:#f2f4f8;--text-dim:#9aa3b2;--border:#2c333f;--accent:#5b8cff;--accent-soft:#5b8cff24;color:var(--text);background:var(--bg)}.app.light{--bg:#f4f6fa;--surface:#fff;--surface-2:#eef1f7;--text:#15181f;--text-dim:#68707e;--border:#e3e8f0;--accent:#2f6bff;--accent-soft:#2f6bff1a;color:var(--text);background:var(--bg)}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{font-family:var(--font);margin:0;font-size:16px;line-height:1.5}.header{justify-content:space-between;align-items:center;padding:16px 20px 8px;display:flex}.home-link{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface);width:fit-content;color:var(--accent);align-self:flex-start;margin:12px 20px 0;padding:8px 14px;font-size:13px;font-weight:600;text-decoration:none;display:inline-block}.home-link:hover{filter:brightness(1.08)}.brand{align-items:baseline;gap:10px;display:flex}.brand-mark{color:var(--accent);font-size:26px;line-height:1}.brand h1{letter-spacing:-.02em;margin:0;font-size:22px;font-weight:700}.brand-tag{color:var(--text-dim);font-size:12px}.icon-btn{background:var(--surface-2);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;width:42px;height:42px;font-size:18px}.icon-btn:hover{filter:brightness(1.08)}.main{flex-direction:column;flex:1;width:100%;max-width:560px;margin:0 auto;padding:8px 20px 24px;display:flex}.patterns{scrollbar-width:none;gap:8px;padding:8px 0 16px;display:flex;overflow-x:auto}.patterns::-webkit-scrollbar{display:none}.chip{border:1px solid var(--border);background:var(--surface);color:var(--text-dim);cursor:pointer;border-radius:999px;flex:none;padding:8px 16px;font-size:14px;font-weight:500;transition:all .15s}.chip-active{background:var(--accent);border-color:var(--accent);color:#fff}.breathe-stage{flex-direction:column;flex:1;justify-content:center;align-items:center;gap:18px;padding:24px 0;display:flex}.orbit{border:2px solid var(--accent-soft);border-radius:50%;justify-content:center;align-items:center;width:240px;height:240px;transition:transform .8s ease-in-out;display:flex}.orbit-inner{background:var(--accent-soft);border:2px solid var(--accent);border-radius:50%;flex-direction:column;justify-content:center;align-items:center;gap:2px;width:168px;height:168px;transition:transform .8s ease-in-out,background .8s;display:flex}.phase-word{letter-spacing:-.02em;text-transform:capitalize;color:var(--accent);font-size:28px;font-weight:700}.phase-count{color:var(--text-dim);font-variant-numeric:tabular-nums;font-size:15px}.phase-inhale .phase-word{color:#34c759}.phase-exhale .phase-word{color:#5b8cff}.pattern-hint{color:var(--text-dim);text-align:center;margin:0;font-size:15px}.session-time{font-variant-numeric:tabular-nums;color:var(--text);margin:0;font-size:20px;font-weight:600}.primary-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:999px;padding:14px 48px;font-size:16px;font-weight:700}.primary-btn:hover{filter:brightness(1.08)}.hint{text-align:center;color:var(--text-dim);margin-top:8px;font-size:13px}.footer{text-align:center;color:var(--text-dim);padding:16px;font-size:12px}