/* ═══════════════════════════════════════════════════════════
   Iron Log — Stylesheet
   ═══════════════════════════════════════════════════════════ */

:root {
  --bg: #08080a;
  --surface: #111114;
  --surface-2: #19191e;
  --surface-3: #222228;
  --border: #2a2a32;
  --border-light: #35353f;
  --text: #e8e6e3;
  --text-dim: #a0a0a8;
  --text-muted: #6a6a72;
  --accent: #e85d3a;
  --accent-glow: #e85d3a33;
  --accent-dim: #e85d3a18;
  --green: #34d399;
  --green-dim: #34d39918;
  --blue: #60a5fa;
  --blue-dim: #60a5fa18;
  --yellow: #fbbf24;
  --yellow-dim: #fbbf2418;
  --red: #f87171;
  --red-dim: #f8717118;
  --radius: 10px;
  --radius-sm: 6px;
  --font: "Instrument Sans", -apple-system, sans-serif;
  --mono: "DM Mono", "SF Mono", monospace;
}

*,
*::before,
*::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, #e85d3a08 0%, transparent 60%),
    radial-gradient(circle at 80% 80%, #60a5fa05 0%, transparent 40%);
}

.container { max-width: 800px; margin: 0 auto; padding: 2rem 1.5rem 4rem; }

/* ── Header ── */
header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  animation: fadeDown 0.5s ease;
}

.logo { display: flex; align-items: center; gap: 0.65rem; margin-bottom: 1rem; }

.logo-mark {
  width: 32px; height: 32px;
  background: var(--accent); border-radius: 7px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1rem; color: white;
  box-shadow: 0 0 20px var(--accent-glow);
}

.logo h1 { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.04em; }
.logo h1 span { color: var(--text-muted); font-weight: 400; }

/* ── Tabs ── */
.tabs {
  display: flex; gap: 2px;
  background: var(--surface); border-radius: 100px; padding: 3px;
  border: 1px solid var(--border); width: fit-content;
}

.tab {
  font-family: var(--font); font-size: 0.78rem; font-weight: 600;
  padding: 0.4rem 1rem; border-radius: 100px;
  border: none; background: transparent; color: var(--text-muted);
  cursor: pointer; transition: all 0.2s; white-space: nowrap;
}

.tab:hover { color: var(--text-dim); }
.tab.active { background: var(--accent); color: white; box-shadow: 0 2px 8px var(--accent-glow); }

/* ── Panels ── */
.panel { display: none; animation: fadeUp 0.35s ease; }
.panel.active { display: block; }
.hidden { display: none !important; }

/* ── Cards ── */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.5rem;
  margin-bottom: 0.75rem; transition: border-color 0.2s;
}
.card:hover { border-color: var(--border-light); }

.card-header {
  font-size: 0.72rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--text-muted);
  margin-bottom: 0.75rem; display: flex; align-items: center; gap: 0.5rem;
}

.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.dot-blue { background: var(--blue); }
.dot-green { background: var(--green); }

.stack { display: flex; flex-direction: column; gap: 0.5rem; }

/* ── Form Elements ── */
label {
  display: block; font-size: 0.72rem; font-weight: 500;
  color: var(--text-muted); margin-bottom: 0.3rem;
  font-family: var(--mono); letter-spacing: 0.02em;
}

textarea, input[type="text"], input[type="number"], input[type="date"], select {
  width: 100%;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text);
  font-family: var(--mono); font-size: 0.82rem;
  padding: 0.6rem 0.75rem; transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

textarea:focus, input:focus, select:focus {
  border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim);
}

textarea { min-height: 180px; resize: vertical; line-height: 1.7; }
textarea::placeholder { color: var(--text-muted); opacity: 0.4; }

.form-group { margin-bottom: 1rem; }
.form-row { display: grid; gap: 0.75rem; }
.form-row-2 { grid-template-columns: 1fr 1fr; }
.form-row-3 { grid-template-columns: 1fr 1fr 1fr; }
.form-row-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }
.form-actions { display: flex; align-items: flex-end; }

.file-drop {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.55rem 0.85rem; background: var(--bg);
  border: 1px dashed var(--border); border-radius: var(--radius-sm);
  color: var(--text-muted); font-size: 0.78rem; font-family: var(--mono);
  cursor: pointer; transition: all 0.2s;
}
.file-drop:hover { border-color: var(--accent); border-style: solid; color: var(--text-dim); }
.file-drop input { display: none; }
.file-drop .arrow { color: var(--accent); font-size: 1.1rem; }

.file-name { font-size: 0.72rem; color: var(--green); font-family: var(--mono); margin-top: 0.25rem; min-height: 1rem; }

.error-msg {
  background: #dc262622; border: 1px solid #dc2626; color: #fca5a5;
  padding: 0.6rem 0.85rem; border-radius: var(--radius-sm);
  font-size: 0.8rem; margin-top: 0.75rem;
}

/* ── Buttons ── */
.btn {
  font-family: var(--font); font-weight: 600; font-size: 0.82rem;
  padding: 0.55rem 1.3rem; border-radius: var(--radius-sm);
  border: none; cursor: pointer; transition: all 0.15s;
  display: inline-flex; align-items: center; gap: 0.4rem;
}

.btn-primary {
  background: var(--accent); color: white;
  box-shadow: 0 2px 10px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 16px var(--accent-glow); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-sm { font-size: 0.75rem; padding: 0.4rem 0.9rem; }

/* ── Session Cards ── */
.session-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem 1.25rem;
  cursor: pointer; transition: all 0.15s;
  display: grid; grid-template-columns: 3.2rem 1fr auto;
  align-items: center; gap: 1rem;
}
.session-card:hover { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent-dim); }

.session-day { text-align: center; line-height: 1.2; }
.session-day .num { font-family: var(--mono); font-size: 1.3rem; font-weight: 500; }
.session-day .month { font-size: 0.62rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); }

.session-info h3 { font-size: 0.9rem; font-weight: 600; margin-bottom: 0.15rem; }
.session-meta { display: flex; gap: 0.85rem; font-family: var(--mono); font-size: 0.72rem; color: var(--text-muted); }

.tag {
  font-size: 0.62rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; padding: 0.22rem 0.65rem;
  border-radius: 100px; white-space: nowrap;
}
.tag-strength { background: var(--accent-dim); color: var(--accent); border: 1px solid #e85d3a30; }
.tag-cardio { background: var(--green-dim); color: var(--green); border: 1px solid #34d39930; }

/* ── Stats Grid ── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(90px, 1fr)); gap: 0.5rem; }

.stat {
  background: var(--bg); border-radius: var(--radius-sm);
  padding: 0.6rem 0.65rem; text-align: center;
  border: 1px solid transparent; transition: border-color 0.2s;
}
.stat:hover { border-color: var(--border); }

.stat-value { font-family: var(--mono); font-size: 1.15rem; font-weight: 500; }
.stat-value.accent { color: var(--accent); }
.stat-value.green { color: var(--green); }
.stat-value.blue { color: var(--blue); }
.stat-unit { font-size: 0.65rem; color: var(--text-muted); }
.stat-label { font-size: 0.62rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-top: 0.1rem; }

/* ── HR Zone Bar ── */
.hz-bar { display: flex; height: 22px; border-radius: 4px; overflow: hidden; gap: 2px; }
.hz-bar div {
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 0.58rem; font-weight: 500;
  color: rgba(255,255,255,0.85); min-width: 0; border-radius: 2px;
}
.hz-1 { background: #3b82f6; } .hz-2 { background: #22c55e; }
.hz-3 { background: #eab308; } .hz-4 { background: #f97316; } .hz-5 { background: #ef4444; }

/* ── Exercise Detail ── */
.exercise-block { margin-bottom: 1rem; }
.exercise-block:last-child { margin-bottom: 0; }

.exercise-name {
  font-weight: 600; font-size: 0.88rem; margin-bottom: 0.3rem;
  padding-left: 0.5rem; border-left: 2px solid var(--accent);
}

.set-row {
  display: grid; grid-template-columns: 1.8rem 4rem 1rem 4.5rem;
  align-items: center; font-family: var(--mono); font-size: 0.78rem;
  padding: 0.15rem 0 0.15rem 0.75rem; color: var(--text-muted);
}
.set-row .n { font-size: 0.65rem; }
.set-row .reps { color: var(--text); }
.set-row .x { color: var(--text-muted); text-align: center; }
.set-row .wt { color: var(--accent); }

/* ── Exercise Index ── */
.ex-item {
  display: grid; grid-template-columns: 1fr auto auto;
  align-items: center; gap: 1rem; padding: 0.7rem 0;
  border-bottom: 1px solid var(--border); font-size: 0.85rem; cursor: pointer;
}
.ex-item:last-child { border-bottom: none; }
.ex-item .name { font-weight: 500; }
.ex-item .detail { font-family: var(--mono); font-size: 0.75rem; color: var(--text-muted); }
.ex-item .max { font-family: var(--mono); font-size: 0.82rem; color: var(--accent); font-weight: 500; }

/* ── Trend Badges ── */
.trend {
  display: inline-flex; align-items: center; gap: 0.25rem;
  font-family: var(--mono); font-size: 0.72rem; font-weight: 500;
  padding: 0.15rem 0.5rem; border-radius: 100px;
}
.trend-up { color: var(--green); background: var(--green-dim); }
.trend-down { color: var(--red); background: var(--red-dim); }
.trend-steady { color: var(--yellow); background: var(--yellow-dim); }
.trend-neutral { color: var(--text-muted); background: var(--surface-3); }

/* ── Body Metrics ── */
.metric-header, .metric-row {
  display: grid; grid-template-columns: 5.5rem 1fr 1fr 1fr auto;
  align-items: center; gap: 0.6rem; padding: 0.55rem 0; font-size: 0.82rem;
}
.metric-header {
  font-size: 0.68rem; font-weight: 600; color: var(--text-dim);
  border-bottom: 1px solid var(--border-light); padding-bottom: 0.4rem; margin-bottom: 0.2rem;
}
.metric-row { border-bottom: 1px solid var(--border); }
.metric-row:last-child { border-bottom: none; }
.metric-row .date { font-family: var(--mono); font-size: 0.75rem; color: var(--text-muted); }
.metric-row .val { font-family: var(--mono); text-align: center; }

/* ── Trend Summary ── */
.trend-card {
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem 1.5rem; margin-bottom: 0.75rem;
}
.trend-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.trend-card-header h3 { font-size: 0.95rem; font-weight: 600; }

.trend-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; }

.trend-item { text-align: center; padding: 0.75rem 0.5rem; background: var(--bg); border-radius: var(--radius-sm); }
.trend-item .label { font-size: 0.65rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.3rem; }
.trend-item .value { font-family: var(--mono); font-size: 1.3rem; font-weight: 500; }
.trend-item .delta { font-family: var(--mono); font-size: 0.72rem; margin-top: 0.15rem; }

/* ── Section Labels ── */
.section-label {
  font-size: 0.68rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-muted); margin: 1.25rem 0 0.6rem;
}

/* ── Overlay ── */
.overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.6); backdrop-filter: blur(4px);
  z-index: 100; justify-content: center; align-items: flex-start;
  padding-top: 5vh;
}
.overlay.open { display: flex; animation: fadeIn 0.2s ease; }

.overlay-panel {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.5rem; width: 90%;
  max-width: 560px; max-height: 85vh; overflow-y: auto;
  animation: slideUp 0.3s ease;
}
.overlay-panel::-webkit-scrollbar { width: 4px; }
.overlay-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.detail-top {
  display: flex; justify-content: space-between; align-items: flex-start;
  margin-bottom: 1.25rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border);
}
.detail-top h3 { font-size: 1.05rem; font-weight: 700; letter-spacing: -0.02em; }
.detail-top .date { font-family: var(--mono); font-size: 0.75rem; color: var(--text-muted); margin-top: 0.2rem; }

.close-btn {
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text-muted); width: 28px; height: 28px; border-radius: 50%;
  cursor: pointer; font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s;
}
.close-btn:hover { background: var(--surface-3); color: var(--text); }

/* ── Empty State ── */
.empty { text-align: center; padding: 2.5rem 1rem; color: var(--text-muted); font-size: 0.85rem; }
.empty .icon { font-size: 1.8rem; margin-bottom: 0.4rem; opacity: 0.5; }

/* ── Animations ── */
@keyframes fadeDown { from { opacity: 0; transform: translateY(-12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }

/* ── Responsive ── */
@media (max-width: 600px) {
  .container { padding: 1.25rem 1rem 3rem; }
  .form-row-2, .form-row-3 { grid-template-columns: 1fr; }
  .form-row-4 { grid-template-columns: 1fr 1fr; }
  .trend-summary { grid-template-columns: 1fr; }
  .metric-header, .metric-row { grid-template-columns: 4.5rem repeat(3, 1fr) auto; gap: 0.4rem; font-size: 0.75rem; }
  .session-card { grid-template-columns: 2.8rem 1fr auto; gap: 0.7rem; }
}