:root {
  --bg: #0b0f19;
  --bg-soft: #131a2b;
  --bg-card: #17203a;
  --border: #232d4a;
  --text: #e8ecf5;
  --text-dim: #9aa3b8;
  --primary: #5b8cff;
  --accent: #22c58b;
  --warn: #f0b441;
  --danger: #ff6161;
  --radius: 14px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7fb;
    --bg-soft: #eceff7;
    --bg-card: #ffffff;
    --border: #dce1ed;
    --text: #0e1628;
    --text-dim: #5f6b84;
    --shadow: 0 4px 24px rgba(16, 24, 40, 0.08);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
  line-height: 1.45;
  padding-top: calc(56px + var(--safe-top));
  padding-bottom: calc(72px + var(--safe-bottom));
}

@media (min-width: 800px) {
  body { padding-bottom: 24px; }
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

a { color: var(--primary); text-decoration: none; }

/* ---------- Top bar ---------- */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: calc(56px + var(--safe-top));
  padding-top: var(--safe-top);
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  padding-left: 16px;
  padding-right: 16px;
  z-index: 20;
  backdrop-filter: blur(8px);
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
}

.nav-desktop {
  display: none;
  flex: 1;
  gap: 18px;
  justify-content: center;
}

.nav-desktop a {
  color: var(--text-dim);
  padding: 6px 10px;
  border-radius: 8px;
}

.nav-desktop a.active {
  color: var(--text);
  background: var(--bg-card);
}

@media (min-width: 800px) {
  .nav-desktop { display: flex; }
}

.ghost-btn {
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 10px;
  width: 38px;
  height: 38px;
  cursor: pointer;
  font-size: 1rem;
}
.ghost-btn:hover { color: var(--text); border-color: var(--text-dim); }

/* ---------- Tab bar (mobile) ---------- */
.tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  height: calc(64px + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  z-index: 20;
}

.tabbar a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--text-dim);
  padding: 6px 2px;
}

.tabbar a span { font-size: 22px; }
.tabbar a small { font-size: 10px; }
.tabbar a.active { color: var(--primary); }

@media (min-width: 800px) {
  .tabbar { display: none; }
}

/* ---------- Main ---------- */
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
}

h1, h2, h3 { margin: 0 0 8px 0; }
h1 { font-size: 1.6rem; }
h2 { font-size: 1.2rem; }
h3 { font-size: 1rem; color: var(--text-dim); font-weight: 600; }

.muted { color: var(--text-dim); margin: 4px 0; }
.error { color: var(--danger); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
}

.card h2 { margin-bottom: 4px; }
.card .kpi {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 10px;
}
.card .kpi > div {
  background: var(--bg-soft);
  border-radius: 10px;
  padding: 10px;
  text-align: center;
}
.card .kpi .v { font-size: 1.2rem; font-weight: 700; }
.card .kpi .l { font-size: 0.72rem; color: var(--text-dim); margin-top: 2px; }

.cta-primary, .cta-secondary, .cta-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 16px;
  border-radius: 10px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  margin-top: 8px;
}

.cta-primary { background: var(--primary); color: white; }
.cta-primary:hover { filter: brightness(1.08); }
.cta-secondary { background: var(--bg-soft); color: var(--text); border: 1px solid var(--border); }
.cta-ghost { background: transparent; color: var(--text-dim); }

button:disabled { opacity: 0.6; cursor: not-allowed; }

/* ---------- Forms ---------- */
.form-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}

.form-row label { color: var(--text-dim); font-size: 0.82rem; }

input[type="text"], input[type="number"], input[type="password"],
input[type="date"], textarea, select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  outline: none;
}

input:focus, textarea:focus, select:focus {
  border-color: var(--primary);
}

textarea { resize: vertical; min-height: 80px; }

/* ---------- Login ---------- */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
  padding-top: 24px;
  padding-bottom: 24px;
}
.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
  max-width: 380px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow);
}
.login-logo { font-size: 48px; line-height: 1; }
.login-card h1 { margin-top: 12px; }
.login-card input {
  margin: 14px 0 10px 0;
  text-align: center;
  font-size: 1.05rem;
}
.login-card button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 14px;
  border-radius: 10px;
  font-weight: 600;
  width: 100%;
  font-size: 1rem;
  cursor: pointer;
}

/* ---------- Exercise card (session) ---------- */
.exo-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 12px;
}

.exo-card.done { border-color: var(--accent); }

.exo-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 6px;
}

.exo-card header .title {
  font-weight: 700;
  font-size: 1rem;
}

.exo-card .prescription {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.exo-card .cue {
  background: var(--bg-soft);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.inputs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}
.inputs-grid .form-row { margin-bottom: 0; }
.inputs-grid input { text-align: center; }

.feel-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}
.feel-row button {
  padding: 10px 8px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
}
.feel-row button.selected[data-feel="dur"] { background: var(--danger); color: white; border-color: var(--danger); }
.feel-row button.selected[data-feel="ok"]  { background: var(--accent); color: white; border-color: var(--accent); }
.feel-row button.selected[data-feel="facile"] { background: var(--warn); color: #0b0f19; border-color: var(--warn); }

.exo-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}
.exo-actions button { flex: 1; }

.rest-timer {
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-soft);
  padding: 10px 12px;
  border-radius: 10px;
  font-variant-numeric: tabular-nums;
}
.rest-timer .time { font-size: 1.4rem; font-weight: 700; }

/* ---------- Badges ---------- */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--bg-soft);
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.badge.ok { color: var(--accent); border-color: var(--accent); }
.badge.warn { color: var(--warn); border-color: var(--warn); }
.badge.danger { color: var(--danger); border-color: var(--danger); }
.badge.primary { color: var(--primary); border-color: var(--primary); }

/* ---------- Lists ---------- */
.list-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}
.list-item:hover { border-color: var(--primary); cursor: pointer; }
.list-item .title { font-weight: 600; }
.list-item .sub { color: var(--text-dim); font-size: 0.85rem; }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: calc(80px + var(--safe-bottom));
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: 10px;
  box-shadow: var(--shadow);
  z-index: 100;
  font-size: 0.9rem;
  opacity: 0;
  transition: opacity 0.2s;
}
.toast.visible { opacity: 1; }

/* ---------- Chart ---------- */
.chart {
  width: 100%;
  height: 180px;
  margin-top: 10px;
}

/* ---------- Utility ---------- */
.row { display: flex; gap: 8px; align-items: center; }
.row > * { flex: 1; }
.spacer { flex: 1; }
.spinner { text-align: center; color: var(--text-dim); padding: 30px; }
.empty { text-align: center; color: var(--text-dim); padding: 40px 20px; }