:root{
  --navy:#061a3e;
  --blue:#0b57c7;
  --green:#2e8b57;
  --orange:#ef7b23;
  --purple:#7547b8;
  --text:#101828;
  --muted:#667085;
  --line:#dbe3ef;
  --bg:#f6f8fb;
  --card:#fff;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;overflow:hidden;background:var(--bg);color:var(--text);font-family:"Yu Gothic UI","Meiryo",system-ui,sans-serif}
button,input,select{font:inherit}
button{cursor:pointer}
.hidden{display:none!important}
#app{height:100vh;display:grid;grid-template-rows:58px 8px minmax(0,1fr) 104px}

.app-header{
  background:var(--navy);color:#fff;display:flex;align-items:center;
  gap:16px;padding:0 18px;min-width:0
}
.brand{font-weight:800;font-size:1rem;white-space:nowrap}
.brand small{font-size:.66em}
.phase-top{background:#0f56c6;padding:9px 18px;border-radius:9px;font-weight:800;white-space:nowrap}
.round-top{font-weight:800;white-space:nowrap}
.top-spacer{flex:1}
.top-time{display:flex;flex-direction:column;text-align:center;padding:0 16px;border-right:1px solid rgba(255,255,255,.3)}
.top-time span{font-size:.7rem}
.top-time strong{font-size:1.55rem;line-height:1}
.header-button{background:#213557;color:#fff;border:0;border-radius:10px;padding:9px 14px;font-weight:700}

.global-progress{background:#dfe6f1;overflow:hidden}
.global-progress>div{height:100%;width:0;background:linear-gradient(90deg,var(--blue),#3b82f6);transition:width .2s linear}

.layout{
  min-height:0;display:grid;grid-template-columns:280px minmax(520px,1fr) 260px;
  background:#fff
}
.left-sidebar,.right-sidebar{background:#fbfcfe;padding:8px;overflow:auto}
.left-sidebar{border-right:1px solid var(--line)}
.right-sidebar{border-left:1px solid var(--line)}
.menu-section{margin-bottom:8px}
.menu-section h2,.side-card h2{
  margin:0;background:var(--navy);color:white;font-size:.83rem;
  padding:6px 9px;border-radius:7px 7px 0 0
}
.menu-list{border:1px solid var(--line);border-top:0;background:#fff}
.menu-item{
  display:grid;grid-template-columns:24px 1fr 40px;align-items:center;
  min-height:35px;border-bottom:1px solid var(--line);padding:3px 6px;background:#fff
}
.menu-item:last-child{border-bottom:0}
.menu-item.active{background:#eaf2ff;box-shadow:inset 4px 0 0 var(--blue)}
.menu-num{width:19px;height:19px;border-radius:50%;background:var(--blue);color:white;display:grid;place-items:center;font-size:.68rem;font-weight:800}
.menu-name{font-weight:700;font-size:.72rem;line-height:1.2}
.menu-time{background:#eef1f5;border-radius:14px;padding:2px 4px;text-align:center;font-size:.66rem}
.compact-list .menu-item{min-height:31px}

.center-stage{padding:18px 22px 12px;min-width:0;overflow:hidden;display:grid;grid-template-rows:auto auto auto minmax(0,1fr) auto}
.current-label{display:inline-block;width:max-content;background:var(--blue);color:#fff;border-radius:6px;padding:4px 9px;font-weight:800;font-size:.8rem}
.center-stage>h1{font-size:clamp(1.9rem,3vw,3.1rem);margin:10px 0 2px}
.exercise-sub{color:var(--muted);font-weight:700;min-height:1.2em;margin:0 0 6px;font-size:.92rem}

.main-content-row{display:grid;grid-template-columns:44% 56%;align-items:center;min-height:0}
.timer-panel{text-align:center}
.timer-circle{width:min(255px,25vw);aspect-ratio:1;margin:auto;position:relative}
.timer-circle svg{width:100%;height:100%;transform:rotate(-90deg)}
.timer-bg,.timer-arc{fill:none;stroke-width:7}
.timer-bg{stroke:#d7dce4}
.timer-arc{stroke:var(--blue);stroke-linecap:round;stroke-dasharray:326.73;transition:stroke-dashoffset .2s linear}
.timer-text,.countdown-text{position:absolute;inset:0;display:grid;place-items:center;font-weight:900;font-variant-numeric:tabular-nums}
.timer-text{font-size:clamp(3rem,5vw,4.8rem)}
.countdown-text{font-size:clamp(6rem,10vw,9rem);color:var(--orange);background:rgba(255,255,255,.92);border-radius:50%}
.interval-caption{display:inline-block;background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.1);padding:6px 14px;border-radius:18px;font-weight:700;font-size:.82rem}

.current-guide{height:100%;max-height:310px;background:linear-gradient(180deg,#f6fbf7,#eef8f1);border:1px solid #bcd9c4;border-radius:12px;padding:18px 20px;align-self:center}
.guide-badge{display:inline-block;background:var(--green);color:white;border-radius:5px;padding:4px 8px;font-weight:800;font-size:.76rem}
.current-guide h2{margin:10px 0 10px;font-size:1.25rem}
.current-guide ul{margin:0;padding-left:1.4em;line-height:1.8;font-size:.95rem}
.current-guide li::marker{color:var(--green)}

.bottom-info-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:10px}
.next-card,.status-card{border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:#fff}
.next-heading{display:flex;gap:8px;align-items:center}
.next-heading span{background:var(--blue);color:#fff;border-radius:5px;padding:4px 8px;font-weight:800;font-size:.76rem}
.next-card h2,.status-card h2{margin:8px 0 3px;font-size:1.1rem}
.next-card p{margin:0;color:var(--muted);font-size:.82rem}
.status-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.status-grid div{background:#f3f6fa;border-radius:8px;padding:8px}
.status-grid span{display:block;color:var(--muted);font-size:.7rem}
.status-grid strong{font-size:1rem}

.side-card{background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden;margin-bottom:10px}
.side-next-body{padding:12px;min-height:98px}
.side-next-body span{display:block;color:var(--blue);font-weight:800;font-size:.78rem;margin-bottom:5px}
.side-next-body strong{display:block;font-size:1rem}
.side-next-body p{margin:6px 0 0;color:var(--muted);font-size:.8rem}
.muscle-label{min-height:88px;display:grid;place-items:center;text-align:center;font-size:1.18rem;font-weight:800;padding:12px}
.progress-card{padding-bottom:10px}
.progress-track{height:12px;background:#edf0f5;border-radius:20px;overflow:hidden;margin:14px 12px 4px}
.progress-track>div{height:100%;width:0;background:var(--blue);border-radius:20px}
.progress-card p{margin:5px 12px;font-weight:700;font-size:.78rem}
.shortcut-list{padding:10px 12px;display:flex;flex-direction:column;gap:5px;font-size:.76rem;color:var(--muted)}

.app-footer{background:#fff;border-top:1px solid var(--line);display:grid;grid-template-rows:62px 42px}
.controls{display:flex;justify-content:center;align-items:center;gap:10px;padding:8px}
.controls button{background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px 18px;font-weight:800;font-size:.86rem}
.controls .start-button{background:var(--blue);color:#fff;min-width:245px;font-size:1.03rem}
.audio-bar{display:flex;align-items:center;justify-content:center;gap:32px;background:var(--navy);color:#fff;padding:7px 18px;font-size:.82rem}
.audio-bar label{display:flex;align-items:center;gap:8px;font-weight:700}
.audio-bar input{accent-color:#2e79df}
.audio-bar output{min-width:38px}
.audio-bar>span{font-weight:700}

dialog{border:0;border-radius:14px;width:min(500px,calc(100% - 30px));padding:0}
dialog::backdrop{background:rgba(0,0,0,.45)}
dialog form{padding:22px}
.dialog-title{display:flex;justify-content:space-between;align-items:center}
.dialog-title button{border:0;background:transparent;font-size:1.7rem}
dialog label{display:block;font-weight:700;margin:16px 0}
dialog input[type=number],dialog select{display:block;width:100%;padding:10px;margin-top:6px;border:1px solid var(--line);border-radius:8px}
dialog .check{display:flex;gap:8px;align-items:center}
dialog menu{display:flex;justify-content:flex-end;gap:10px;padding:0;margin-top:22px}
dialog menu button{padding:10px 18px;border:0;border-radius:8px}
dialog .save{background:var(--blue);color:#fff}

@media(max-width:1120px){
  .layout{grid-template-columns:240px 1fr}
  .right-sidebar{display:none}
}
@media(max-width:800px){
  html,body{overflow:auto}
  #app{height:auto;min-height:100vh;display:flex;flex-direction:column}
  .app-header{min-height:58px;height:auto;flex-wrap:wrap;padding:10px}
  .top-spacer{display:none}
  .layout{display:block}
  .left-sidebar{display:none}
  .center-stage{padding:16px 12px}
  .main-content-row{grid-template-columns:1fr;gap:12px}
  .timer-circle{width:min(68vw,250px)}
  .current-guide{max-height:none}
  .bottom-info-row{grid-template-columns:1fr}
  .app-footer{display:block}
  .controls{display:grid;grid-template-columns:1fr 1fr}
  .controls .start-button{min-width:0;grid-column:1/-1}
  .audio-bar{flex-direction:column;gap:8px;align-items:stretch}
}

/* Ver.5: posture images */
.main-content-row{grid-template-columns:minmax(260px,1.1fr) minmax(190px,.72fr) minmax(260px,1fr);align-items:stretch;}
.exercise-visual{margin:0;min-width:0;border:1px solid #dbe3ef;border-radius:14px;overflow:hidden;background:#fff;display:flex;flex-direction:column;}
.exercise-visual img{display:block;width:100%;height:100%;min-height:255px;object-fit:contain;background:#fff;}
.exercise-visual figcaption{padding:6px 10px;background:#f3f7fc;color:#52647d;font-size:12px;text-align:center;}
.menu-item{grid-template-columns:42px 24px 1fr auto;}
.menu-thumb{width:42px;height:30px;object-fit:cover;border-radius:5px;border:1px solid #dce5f0;background:#fff;}
.side-next-image{display:block;width:100%;height:145px;object-fit:contain;margin:0 0 8px;border-radius:9px;border:1px solid #dce5f0;background:#fff;}
@media (max-width:1180px){.main-content-row{grid-template-columns:minmax(230px,1fr) minmax(175px,.72fr)}.current-guide{grid-column:1 / -1}.exercise-visual img{min-height:210px}}
@media (max-width:850px){.main-content-row{grid-template-columns:1fr}.exercise-visual img{min-height:220px}}