:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-2: #f1f3f6;
  --border: #e3e7ec;
  --text: #263140;
  --text-dim: #74808f;
  --accent: #0891a8;
  --accent-2: #7c5cd9;
  --success: #12966b;
  --warning: #c8790a;
  --danger: #d64545;
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

#app { min-height: 100vh; display: flex; flex-direction: column; }

.container { max-width: 720px; margin: 0 auto; padding: 20px 16px 100px; width: 100%; }

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: rgba(247,248,250,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 14px 16px;
  display: flex; align-items: center; justify-content: space-between;
}
.topbar h1 { font-size: 17px; margin: 0; font-weight: 700; letter-spacing: -0.02em; }
.topbar .brand { display:flex; align-items:center; gap:8px; }
.topbar .brand .dot { width:10px;height:10px;border-radius:50%; background: linear-gradient(135deg, var(--accent), var(--accent-2)); }

/* Bottom nav */
.bottomnav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 30;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--border);
  display: flex; justify-content: space-around;
  padding: 8px 8px calc(8px + env(safe-area-inset-bottom));
}
.navbtn {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  color: var(--text-dim); background: none; border: none; font-size: 11px;
  padding: 6px 10px; border-radius: 10px; cursor: pointer;
}
.navbtn i { font-size: 18px; }
.navbtn.active { color: var(--accent); }

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(38,49,64,0.06);
}
.card h2 { margin: 0 0 12px; font-size: 16px; }
.card h3 { margin: 0 0 8px; font-size: 14px; color: var(--text-dim); font-weight: 600; }

/* Forms */
label { display:block; font-size: 13px; color: var(--text-dim); margin-bottom: 6px; margin-top: 14px; }
label:first-child { margin-top: 0; }
input[type=text], input[type=number], input[type=date], select, textarea {
  width: 100%; padding: 11px 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text); font-size: 15px; outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); }
textarea { resize: vertical; min-height: 60px; font-family: inherit; }

.chip-group { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }
.chip {
  padding: 9px 14px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text-dim); font-size: 13px; cursor: pointer;
  user-select: none; transition: all 0.15s;
}
.chip.selected { background: rgba(8,145,168,0.15); border-color: var(--accent); color: var(--accent); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 20px; border-radius: 12px; border: none; font-size: 15px; font-weight: 600;
  cursor: pointer; width: 100%; transition: transform 0.1s, opacity 0.15s;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: linear-gradient(135deg, var(--accent), #0a7a91); color: #ffffff; }
.btn-secondary { background: var(--surface-2); color: var(--text); border: 1px solid var(--border); }
.btn-danger { background: rgba(214,69,69,0.15); color: var(--danger); border: 1px solid rgba(214,69,69,0.3); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-sm { padding: 8px 14px; font-size: 13px; width: auto; }

.row { display: flex; gap: 10px; }
.row > * { flex: 1; }

.muted { color: var(--text-dim); font-size: 13px; }
.center { text-align: center; }

/* Loading spinner */
.spinner {
  width: 22px; height: 22px; border: 3px solid var(--border);
  border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-box { display: flex; flex-direction: column; align-items: center; gap: 14px; padding: 50px 20px; }

/* Day / exercise list */
.day-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px; border-radius: 12px; background: var(--surface-2);
  border: 1px solid var(--border); margin-bottom: 10px; cursor: pointer;
}
.day-item.completed { opacity: 0.55; }
.day-item .info { display: flex; flex-direction: column; gap: 3px; }
.day-item .title { font-weight: 600; font-size: 14px; }
.day-item .sub { font-size: 12px; color: var(--text-dim); }
.badge {
  font-size: 11px; padding: 3px 9px; border-radius: 999px; font-weight: 600;
}
.badge-active { background: rgba(8,145,168,0.15); color: var(--accent); }
.badge-done { background: rgba(18,150,107,0.15); color: var(--success); }
.badge-deload { background: rgba(200,121,10,0.15); color: var(--warning); }

.exercise-card {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px; margin-bottom: 12px;
}
.exercise-card .ex-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 10px; gap: 10px; }
.exercise-card .ex-name { font-weight: 700; font-size: 15px; }
.exercise-card .ex-meta { font-size: 12px; color: var(--text-dim); margin-top: 2px; }
.exercise-card .ex-notes { font-size: 12px; color: var(--accent-2); margin-top: 6px; font-style: italic; }

/* Exercise guidance: how-to toggle + panel (images primary, video secondary) */
.guidance-toggle {
  flex-shrink: 0;
  display: flex; align-items: center; gap: 6px;
  background: var(--surface); color: var(--text-dim); border: 1px solid var(--border);
  border-radius: 999px; padding: 6px 12px; font-size: 12px; font-weight: 600;
  cursor: pointer; white-space: nowrap; transition: all 0.15s;
}
.guidance-toggle:active { transform: scale(0.97); }
.guidance-toggle.active { background: rgba(8,145,168,0.15); border-color: var(--accent); color: var(--accent); }

.guidance-panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px; margin-bottom: 12px;
}
.guidance-panel[hidden] { display: none; }
.guidance-loading { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--text-dim); padding: 6px 0; }
.guidance-label {
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em;
  color: var(--text-dim); margin-bottom: 8px; display: flex; align-items: center; gap: 6px;
}
.guidance-label .fa-youtube { color: #ff0000; }
.guidance-images { display: flex; gap: 8px; flex-wrap: wrap; }
.guidance-images img {
  width: 140px; height: 140px; object-fit: cover; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface-2);
}
.guidance-video-wrap {
  position: relative; width: 100%; padding-top: 56.25%; border-radius: 8px; overflow: hidden;
  background: var(--surface-2);
}
.guidance-video-wrap iframe {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none;
}
.guidance-fallback { font-size: 12px; color: var(--text-dim); }
.guidance-fallback a { color: var(--accent); }

.set-row {
  display: grid; grid-template-columns: 28px 1fr 1fr 1fr 34px; gap: 8px; align-items: center; margin-bottom: 8px;
}
.set-row .set-num { font-size: 13px; color: var(--text-dim); text-align: center; }
.set-row input { padding: 8px; font-size: 14px; text-align: center; }
.set-check {
  width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-dim);
}
.set-check.done { background: rgba(18,150,107,0.15); border-color: var(--success); color: var(--success); }

.tag { font-size: 11px; padding: 2px 8px; border-radius: 6px; background: var(--surface); color: var(--text-dim); border: 1px solid var(--border); }

.empty-state { text-align: center; padding: 50px 20px; color: var(--text-dim); }
.empty-state i { font-size: 40px; margin-bottom: 14px; opacity: 0.5; }

.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 16px; }
.stat-box { background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.stat-box .val { font-size: 22px; font-weight: 700; }
.stat-box .lbl { font-size: 12px; color: var(--text-dim); margin-top: 3px; }

canvas { max-width: 100%; }

.toast {
  position: fixed; bottom: 90px; left: 50%; transform: translateX(-50%);
  background: #263140; border: 1px solid #263140; color: #f7f8fa;
  padding: 12px 20px; border-radius: 12px; font-size: 14px; z-index: 50;
  box-shadow: 0 8px 24px rgba(38,49,64,0.25);
  animation: fadeUp 0.2s ease-out;
}
@keyframes fadeUp { from { opacity:0; transform: translate(-50%, 10px);} to { opacity:1; transform: translate(-50%,0);} }

.week-pill {
  display: inline-block; padding: 6px 12px; border-radius: 999px; background: var(--surface-2);
  border: 1px solid var(--border); font-size: 12px; margin-right: 6px; margin-bottom: 6px; cursor: pointer;
}
.week-pill.active { background: rgba(8,145,168,0.15); border-color: var(--accent); color: var(--accent); }

a { color: var(--accent); }