:root{
  --bg:#f5f4f0; --surface:#fbfbf9; --panel:#ffffff; --panel-soft:#f7f6f2;
  --ink:#1c1c1a; --ink-hover:#3a3935; --ink-2:#55534d; --sub:#7a776f; --muted:#8a877f;
  --line:#e3e1db; --line-2:#dcdad3; --line-3:#efeee9; --hover:#efeee9; --soft:#f3f2ee; --track:#ebe9e3;
  --accent:#5a8f95; /* 차분한 청록 */
  --accent-deep:#3f6f75;
  --accent-soft:#e4eeee;
  --mist:#eaf1f0;
  --font:"IBM Plex Sans KR",sans-serif; --mono:"JetBrains Mono",monospace;
  --serif:"Gowun Batang","IBM Plex Sans KR",serif;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;word-break:keep-all}
button{font:inherit;color:inherit}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.app{min-height:calc(100vh - 48px);display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 28px;border-bottom:1px solid var(--line);background:var(--surface);flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:14px;min-width:0;flex-wrap:wrap}
.home{font-size:13px;color:var(--ink-2);text-decoration:none}
.home:hover{color:var(--ink)}
.brand-title{font-size:17px;font-weight:700;letter-spacing:-.01em}
.btn{height:36px;padding:0 14px;background:transparent;border:1px solid var(--line-2);border-radius:999px;font-size:13px;cursor:pointer}
.btn:hover{background:var(--hover)}
.btn--solid{background:var(--ink);color:#fff;border:none;font-weight:500}
.btn--solid:hover{background:var(--ink-hover)}
.text-input{height:40px;padding:0 12px;background:var(--surface);border:1px solid var(--line-2);border-radius:8px;font:inherit;font-size:14px;color:var(--ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.check{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--ink-2);cursor:pointer}
.check input{width:16px;height:16px;margin:0;accent-color:var(--accent)}

/* ---------- 레이아웃 ---------- */
.layout{flex:1;display:flex;align-items:stretch}
.stage{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:22px;padding:48px 24px;
  background:radial-gradient(ellipse at 50% 42%,var(--mist) 0%,rgba(234,241,240,.4) 45%,transparent 75%);transition:background 2s}
.panel{flex:0 0 340px;padding:32px 28px;border-left:1px solid var(--line);background:var(--surface);display:flex;flex-direction:column;gap:30px}

/* ---------- 원 ---------- */
.orb-wrap{position:relative;width:min(400px,100%);aspect-ratio:1}
.cycle-ring{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.cycle-ring .seg{fill:none;stroke-width:3;stroke-linecap:round}
.cycle-ring .seg-label{font-family:var(--mono);font-size:9px;letter-spacing:.1em;fill:var(--muted);text-anchor:middle;dominant-baseline:middle}
.cycle-ring .dot{fill:var(--accent-deep);stroke:#fff;stroke-width:3}
.orb-guide{position:absolute;inset:13%;border-radius:50%;border:1px dashed rgba(90,143,149,.35)}
.orb{position:absolute;inset:13%;border-radius:50%;transform:scale(.45);will-change:transform;
  background:radial-gradient(circle at 38% 32%,#ffffff 0%,#d9e9e8 28%,#a9cacb 62%,#7fadb1 100%);
  box-shadow:0 0 0 1px rgba(90,143,149,.15),0 30px 80px rgba(63,111,117,.28),inset 0 -12px 40px rgba(63,111,117,.25)}
.orb::after{content:"";position:absolute;inset:-14%;border-radius:50%;background:radial-gradient(circle,rgba(127,173,177,.28),transparent 68%);z-index:-1}
.stage.is-idle .orb{animation:idle 5s ease-in-out infinite}
@keyframes idle{0%,100%{transform:scale(.45)}50%{transform:scale(.5)}}
.orb-text{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;pointer-events:none;text-align:center}
.phase{font-family:var(--serif);font-size:clamp(22px,6vw,30px);font-weight:700;color:#21484c;letter-spacing:-.01em;transition:opacity .4s}
.count{font-family:var(--mono);font-size:clamp(28px,8vw,40px);font-weight:400;color:#2f5d62;font-variant-numeric:tabular-nums;line-height:1}
.phase.is-swap{opacity:0}

.instruction{margin:0;min-height:1.6em;font-family:var(--serif);font-size:17px;line-height:1.6;color:var(--ink-2);text-align:center;transition:opacity .5s}
.meta{display:flex;align-items:center;gap:14px;font-size:14px;flex-wrap:wrap;justify-content:center}
.meta b{font-family:var(--mono);font-weight:500;font-variant-numeric:tabular-nums;margin-left:4px}
.meta-sep{width:1px;height:14px;background:var(--line-2)}

.controls{display:flex;gap:12px}
.ctrl{min-width:96px;height:48px;padding:0 20px;border:1px solid var(--line-2);border-radius:999px;background:rgba(255,255,255,.7);font-size:14px;cursor:pointer;transition:background .2s}
.ctrl:hover{background:#fff}
.ctrl--main{min-width:130px;background:var(--accent-deep);border:none;color:#fff;font-weight:500}
.ctrl--main:hover{background:#355f64}

/* ---------- 패널 ---------- */
.group{display:flex;flex-direction:column;gap:14px}
.group-title{margin:0;display:flex;align-items:baseline;gap:10px;font-size:15px;font-weight:700}
.patterns{display:flex;flex-direction:column;gap:8px}
.pattern{display:flex;justify-content:space-between;align-items:center;gap:12px;width:100%;padding:14px 16px;border:1px solid var(--line-2);border-radius:14px;background:var(--panel);text-align:left;cursor:pointer;transition:border-color .2s,background .2s}
.pattern:hover{border-color:var(--accent)}
.pattern[aria-checked="true"]{border-color:var(--accent-deep);background:var(--accent-soft);box-shadow:inset 0 0 0 1px var(--accent-deep)}
.pattern-name{display:flex;flex-direction:column;gap:2px}
.pattern-name b{font-size:15px;font-weight:500}
.pattern-name small{font-size:12px;color:var(--sub)}
.rhythm{display:flex;gap:4px;font-family:var(--mono);font-size:13px;color:var(--accent-deep);flex-shrink:0}
.rhythm span{min-width:22px;height:22px;display:flex;align-items:center;justify-content:center;border-radius:6px;background:rgba(90,143,149,.12)}
.desc{margin:0;font-size:13px;line-height:1.7;color:var(--ink-2)}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{height:34px;padding:0 14px;border:1px solid var(--line-2);border-radius:999px;background:var(--panel);font-size:13px;cursor:pointer}
.chip:hover{border-color:var(--accent)}
.chip[aria-checked="true"]{background:var(--accent-deep);border-color:var(--accent-deep);color:#fff}
.caution{margin:auto 0 0;font-size:12px;line-height:1.6;color:var(--muted)}

.done-note{color:var(--accent-deep)}

@media (max-width:900px){
  .layout{flex-direction:column}
  .panel{flex:none;border-left:none;border-top:1px solid var(--line);padding:28px 16px 40px}
  .stage{padding:32px 16px 36px}
}
@media (max-width:640px){
  .topbar{padding:14px 16px}
  .instruction{font-size:15px}
}
@media (prefers-reduced-motion:reduce){
  .stage.is-idle .orb{animation:none}
  .phase,.instruction,.stage{transition:none}
}

/* 다크 모드 (인쇄는 라이트 그대로) · 밤 호흡용: 원은 은은한 청록 빛으로 */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#121616; --surface:#171c1c; --panel:#1c2222; --panel-soft:#212828;
    --ink:#e8eded; --ink-hover:#ffffff; --ink-2:#c3cccc; --sub:#9ba6a6; --muted:#859090;
    --line:#2a3232; --line-2:#343d3d; --line-3:#242b2b; --hover:#263030; --soft:#222a2a; --track:#303a3a;
    --accent:#76aeb4; --accent-deep:#8cc4c8; --accent-soft:rgba(118,174,180,.14);
    --mist:#1b2b2c;
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .ctrl--main,
  :root[data-theme="dark"] .chip[aria-checked="true"]{color:var(--bg)}
  :root[data-theme="dark"] .stage{background:radial-gradient(ellipse at 50% 42%,var(--mist) 0%,rgba(27,43,44,.45) 45%,transparent 75%)}
  :root[data-theme="dark"] .ctrl{background:var(--panel)}
  :root[data-theme="dark"] .ctrl:hover{background:var(--hover)}
  :root[data-theme="dark"] .ctrl--main{background:var(--accent-deep)}
  :root[data-theme="dark"] .ctrl--main:hover{background:#a6d6d9}
  :root[data-theme="dark"] .cycle-ring .dot{stroke:var(--bg)}
  :root[data-theme="dark"] .cycle-ring .seg[stroke="#5a8f95"]{stroke:#5f989e}
  :root[data-theme="dark"] .cycle-ring .seg[stroke="#3f6f75"]{stroke:#8cc4c8}
  :root[data-theme="dark"] .cycle-ring .seg[stroke="#b9d2d1"]{stroke:#466667}
  :root[data-theme="dark"] .cycle-ring .seg[stroke="#d7e3e2"]{stroke:#344647}
  :root[data-theme="dark"] .orb{
    background:radial-gradient(circle at 38% 32%,#a8d2d4 0%,#6fa4a8 26%,#3f7378 60%,#28494d 100%);
    box-shadow:0 0 0 1px rgba(140,196,200,.18),0 30px 80px rgba(70,140,146,.25),inset 0 -12px 40px rgba(10,30,32,.35)}
  :root[data-theme="dark"] .orb::after{background:radial-gradient(circle,rgba(118,174,180,.2),transparent 68%)}
  :root[data-theme="dark"] .phase{color:#eef7f7;text-shadow:0 1px 10px rgba(10,30,32,.5)}
  :root[data-theme="dark"] .count{color:#d4ebec;text-shadow:0 1px 10px rgba(10,30,32,.5)}
  :root[data-theme="dark"] .rhythm span{background:rgba(118,174,180,.14)}
}