*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f0f13;
  --surface: #1a1a22;
  --surface2: #22222e;
  --border: #2e2e3e;
  --text: #e0e0ec;
  --text-muted: #8888a8;
  --accent: #5b8dd9;
  --accent-dim: #3a5a8a;
  --green: #2d5a3d;
  --green-bright: #4caf73;
  --amber: #5a3d00;
  --amber-bright: #c8860a;
  --danger: #c04040;
  --radius: 10px;
  --tab-height: 60px;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

/* ---- Layout ---- */
#app { display: flex; flex-direction: column; height: 100vh; max-width: 640px; margin: 0 auto; }

#header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
#header h1 { font-size: 1.1rem; font-weight: 600; letter-spacing: 0.02em; }

#export-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
#export-btn:hover { color: var(--accent); border-color: var(--accent-dim); }

#views {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.view { display: none; padding: 16px; padding-bottom: 24px; }
.view.active { display: block; }

#tabs {
  display: flex;
  background: var(--surface);
  border-top: 1px solid var(--border);
  height: var(--tab-height);
  flex-shrink: 0;
}
.tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color 0.2s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.tab svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tab.active { color: var(--accent); }

/* ---- Login ---- */
#login-screen {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 100;
  align-items: center;
  justify-content: center;
}
#login-screen.visible { display: flex; }

.login-box {
  width: 100%;
  max-width: 360px;
  padding: 32px 24px;
  background: var(--surface);
  border-radius: 16px;
  margin: 16px;
}
.login-box h2 { font-size: 1.3rem; margin-bottom: 4px; }
.login-box p { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 24px; }

/* ---- Form elements ---- */
label { display: block; font-size: 0.82rem; color: var(--text-muted); margin-bottom: 5px; margin-top: 14px; font-weight: 500; }
label:first-child { margin-top: 0; }

input[type="text"],
input[type="password"],
input[type="date"],
input[type="number"],
textarea,
select {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
}
input:focus, textarea:focus, select:focus { border-color: var(--accent-dim); }

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  height: 4px;
  cursor: pointer;
}

input[type="checkbox"] {
  accent-color: var(--accent);
  width: 18px;
  height: 18px;
  cursor: pointer;
}

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

.btn {
  width: 100%;
  padding: 13px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 18px;
  transition: background 0.2s, opacity 0.2s;
}
.btn:hover { background: var(--accent-dim); }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: #902020; }
.btn.sm {
  width: auto;
  padding: 6px 14px;
  font-size: 0.82rem;
  margin-top: 0;
}
.btn.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.btn.ghost:hover { border-color: var(--accent-dim); color: var(--accent); }

/* ---- Slider row ---- */
.slider-row { display: flex; align-items: center; gap: 10px; }
.slider-row input[type="range"] { flex: 1; }
.slider-val {
  width: 30px;
  text-align: right;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--accent);
  flex-shrink: 0;
}

/* ---- Card ---- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 10px;
}

/* ---- Alert / feedback ---- */
.alert {
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 0.88rem;
  margin-top: 12px;
}
.alert.success { background: rgba(76,175,115,0.15); color: var(--green-bright); border: 1px solid var(--green); }
.alert.error { background: rgba(192,64,64,0.15); color: #e07070; border: 1px solid var(--danger); }

/* ---- Section header ---- */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 20px 0 10px;
}
.section-title { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); font-weight: 600; }

/* ---- Optional fields toggle ---- */
#opt-toggle {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0;
}
#optional-fields { display: none; }
#optional-fields.visible { display: block; }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}
.checkbox-row label { margin: 0; color: var(--text); }
.sub-field { margin-top: 8px; margin-left: 28px; }

/* ---- Stats row ---- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 10px;
  text-align: center;
}
.stat-val { font-size: 1.6rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 0.7rem; color: var(--text-muted); margin-top: 2px; text-transform: uppercase; letter-spacing: 0.06em; }

/* ---- Chart container ---- */
.chart-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 16px;
  position: relative;
}
.chart-wrap canvas { max-height: 260px; }

/* ---- History entries ---- */
.history-entry {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
}
.history-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.history-summary:hover { background: var(--surface2); }
.history-date { font-size: 0.88rem; color: var(--text-muted); }
.history-metrics { display: flex; gap: 12px; font-size: 0.88rem; }
.metric-badge {
  display: flex;
  align-items: center;
  gap: 4px;
}
.metric-label { color: var(--text-muted); font-size: 0.78rem; }
.metric-val { font-weight: 600; }
.mood-val { color: var(--accent); }

.history-detail {
  display: none;
  padding: 0 14px 12px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}
.history-detail.open { display: block; }
.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px 16px;
  margin: 10px 0;
}
.detail-item { color: var(--text-muted); }
.detail-item span { color: var(--text); }
.detail-note { color: var(--text); margin: 8px 0; font-style: italic; }
.history-actions { display: flex; gap: 8px; margin-top: 10px; }

/* ---- Correlation bars ---- */
.corr-chart-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 12px;
}
.corr-chart-wrap canvas { max-height: 220px; }
.corr-title { font-size: 0.85rem; font-weight: 600; margin-bottom: 10px; }

.no-data { color: var(--text-muted); font-size: 0.9rem; padding: 20px 0; text-align: center; }

/* ---- Expand chevron ---- */
.chevron { transition: transform 0.2s; color: var(--text-muted); font-size: 0.75rem; }
.chevron.open { transform: rotate(180deg); }

/* ---- CSV view ---- */
.csv-upload-area {
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  margin-bottom: 16px;
  transition: border-color 0.2s;
}
.csv-upload-area.has-file { border-color: var(--accent-dim); }
.csv-filename { font-size: 0.85rem; color: var(--accent); margin-top: 8px; }
.csv-upload-hint { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 12px; }
#csv-file-input { display: none; }
.csv-select-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 0.88rem;
  cursor: pointer;
}
.csv-select-btn:hover { border-color: var(--accent-dim); color: var(--accent); }

.csv-summary-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}
.csv-summary-chip {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.csv-summary-chip strong { color: var(--text); }

.corr-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; margin-bottom: 16px; }
.corr-table th { text-align: left; padding: 6px 10px; color: var(--text-muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; border-bottom: 1px solid var(--border); }
.corr-table td { padding: 7px 10px; border-bottom: 1px solid var(--border); }
.corr-table tr:last-child td { border-bottom: none; }
.corr-positive { color: var(--green-bright); font-weight: 600; }
.corr-negative { color: var(--amber-bright); font-weight: 600; }
.corr-bar-wrap { display: flex; align-items: center; gap: 8px; }
.corr-bar-bg { flex: 1; height: 6px; background: var(--surface2); border-radius: 3px; overflow: hidden; }
.corr-bar-fill { height: 100%; border-radius: 3px; }

/* ---- Sub-tabs (correlations view) ---- */
.sub-tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.sub-tab {
  padding: 6px 16px; border-radius: 20px; font-size: 0.82rem;
  cursor: pointer; border: 1px solid var(--border); color: var(--text-muted);
  user-select: none;
}
.sub-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.corr-source-bar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 14px; font-size: 0.85rem; color: var(--text-muted);
}
.corr-sub { display: none; }
.corr-sub.active { display: block; }

/* Scrollbar */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }