/* ── CSS Custom Properties ─────────────────────────────────────────── */
:root {
  --bg: #0f172a;
  --bg-2: #1e293b;
  --bg-3: #334155;
  --text: #f8fafc;
  --text-2: #94a3b8;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-light: rgba(99, 102, 241, 0.15);
  --success: #22c55e;
  --error: #ef4444;
  --warning: #f59e0b;
  --border: #334155;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --nav-height: 60px;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-2: #f1f5f9;
  --bg-3: #e2e8f0;
  --text: #0f172a;
  --text-2: #475569;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
}

/* ── Reset & Base ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  padding-bottom: var(--nav-height);
  line-height: 1.5;
}

h1 { font-size: 1.5rem; font-weight: 700; }
h2 { font-size: 1.2rem; font-weight: 600; }
h3 { font-size: 1rem; font-weight: 600; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ───────────────────────────────────────────────────────── */
.app-header {
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.app-main {
  max-width: 680px;
  margin: 0 auto;
  padding: 16px 16px 24px;
}

.section { padding-top: 8px; }

/* ── Bottom Nav ───────────────────────────────────────────────────── */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  display: flex;
  z-index: 200;
}

.nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  background: none;
  border: none;
  color: var(--text-2);
  font-size: 0.65rem;
  font-family: var(--font);
  cursor: pointer;
  min-height: 44px;
  padding: 4px 2px;
  transition: color 0.15s;
}

.nav-btn.active, .nav-btn:hover { color: var(--accent); }
.nav-btn svg { width: 22px; height: 22px; }

/* ── Drive Banner ─────────────────────────────────────────────────── */
.drive-banner {
  background: var(--accent-light);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.875rem;
}

.drive-banner__text { flex: 1; color: var(--text-2); }
.drive-banner__text strong { color: var(--text); }

/* ── Meal Tabs ────────────────────────────────────────────────────── */
.meal-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  margin-bottom: 16px;
  scrollbar-width: none;
}
.meal-tabs::-webkit-scrollbar { display: none; }

.tab-pill {
  flex-shrink: 0;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-2);
  color: var(--text-2);
  font-size: 0.875rem;
  font-family: var(--font);
  cursor: pointer;
  white-space: nowrap;
  min-height: 44px;
  transition: all 0.15s;
}

.tab-pill--active, .tab-pill:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* ── Cards ────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

.card__title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-2);
  margin-bottom: 12px;
}

/* ── Inputs ───────────────────────────────────────────────────────── */
.input {
  width: 100%;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text);
  font-size: 0.95rem;
  font-family: var(--font);
  min-height: 44px;
  transition: border-color 0.15s;
  appearance: none;
  -webkit-appearance: none;
}

.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.input--sm { min-height: 38px; padding: 6px 8px; font-size: 0.875rem; }

.input-group {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
}

.input-group label {
  flex-shrink: 0;
  font-size: 0.875rem;
  color: var(--text-2);
  min-width: 80px;
}

.input-group .input { flex: 1; }

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.field { margin-bottom: 12px; }
.field label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-2);
  margin-bottom: 4px;
}

/* ── BG Source Row ────────────────────────────────────────────────── */
.bg-source-row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.bg-source-row label { font-size: 0.875rem; color: var(--text-2); flex-shrink: 0; }
.bg-source-row select { flex: 1; min-width: 120px; }

.bg-value-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.bg-unit { font-size: 0.875rem; color: var(--text-2); flex-shrink: 0; }
.bg-timestamp { font-size: 0.75rem; color: var(--text-2); margin-top: 4px; }

/* ── Collapsible Settings ─────────────────────────────────────────── */
.collapsible-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: none;
  border: none;
  color: var(--text);
  font-size: 0.95rem;
  font-family: var(--font);
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  min-height: 44px;
}

.collapsible-toggle .chevron {
  transition: transform 0.2s;
  color: var(--text-2);
}

.collapsible-toggle[aria-expanded="true"] .chevron { transform: rotate(180deg); }

/* ── Food Builder ─────────────────────────────────────────────────── */
.food-rows { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }

.food-row {
  display: grid;
  grid-template-columns: 1fr 80px 70px 36px;
  gap: 6px;
  align-items: center;
}

.food-row__search { position: relative; }
.food-row__cf {
  font-size: 0.7rem;
  color: var(--text-2);
  position: absolute;
  bottom: -16px;
  left: 4px;
}

.food-row__carbs {
  display: flex;
  align-items: center;
  gap: 2px;
  font-weight: 600;
  font-size: 0.95rem;
}

.food-row__unit { font-size: 0.7rem; color: var(--text-2); }
.food-row__net { color: var(--text); }

/* ── Food Dropdown ────────────────────────────────────────────────── */
.food-dropdown {
  list-style: none;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  z-index: 1000;
  max-height: 240px;
  overflow-y: auto;
}

.food-dropdown li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  cursor: pointer;
  font-size: 0.875rem;
  border-bottom: 1px solid var(--border);
}

.food-dropdown li:last-child { border-bottom: none; }
.food-dropdown li:hover, .food-dropdown li:focus { background: var(--bg-3); outline: none; }

.food-name { flex: 1; }

.food-badge {
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 999px;
  font-weight: 600;
  flex-shrink: 0;
}

.food-badge--hc { background: #1d4ed8; color: white; }
.food-badge--personal { background: #7c3aed; color: white; }
.food-absorption { font-size: 0.7rem; color: var(--text-2); flex-shrink: 0; }

/* ── Bolus Summary ────────────────────────────────────────────────── */
.bolus-summary {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

.bolus-summary__total {
  text-align: center;
  margin-bottom: 16px;
}

.bolus-summary__total-label {
  font-size: 0.8rem;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 4px;
}

.bolus-summary__total-value {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.03em;
}

.bolus-summary__total-unit {
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text-2);
  margin-left: 4px;
}

.bolus-breakdown {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.bolus-line {
  display: flex;
  flex-direction: column;
}

.bolus-line__label { font-size: 0.7rem; color: var(--text-2); text-transform: uppercase; letter-spacing: 0.04em; }
.bolus-line__value { font-size: 1.1rem; font-weight: 600; }

/* ── Pre-Bolus ────────────────────────────────────────────────────── */
.prebolus-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.prebolus-result {
  text-align: center;
  padding: 12px;
  background: var(--bg-3);
  border-radius: var(--radius-sm);
}

.prebolus-result__label { font-size: 0.75rem; color: var(--text-2); display: block; margin-bottom: 4px; }
.prebolus-result__value { font-size: 1.4rem; font-weight: 700; color: var(--accent); }

/* ── Post-Meal BG ─────────────────────────────────────────────────── */
.collapsible-section { margin-bottom: 12px; }
.collapsible-body { padding-top: 12px; }

.post-bg-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  margin-bottom: 8px;
}

.post-bg-table th, .post-bg-table td {
  text-align: left;
  padding: 6px 4px;
  border-bottom: 1px solid var(--border);
}

.post-bg-table th { color: var(--text-2); font-weight: 600; }

/* ── Buttons ──────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 0.9rem;
  font-family: var(--font);
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  transition: all 0.15s;
  text-decoration: none;
}

.btn--primary { background: var(--accent); color: white; }
.btn--primary:hover { background: var(--accent-hover); }
.btn--primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn--secondary {
  background: var(--bg-3);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn--secondary:hover { background: var(--border); }

.btn--danger { background: var(--error); color: white; }
.btn--danger:hover { opacity: 0.85; }

.btn--sm { padding: 6px 12px; font-size: 0.8rem; min-height: 36px; }

.btn--icon {
  padding: 0;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-3);
  color: var(--text-2);
  border: 1px solid var(--border);
  font-size: 1.2rem;
  line-height: 1;
}

.btn--icon:hover { background: var(--error); color: white; border-color: var(--error); }
.btn--icon:disabled { opacity: 0.3; cursor: not-allowed; }

.btn--full { width: 100%; }

.btn-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

/* ── Log Meal Button ──────────────────────────────────────────────── */
#log-meal-btn {
  width: 100%;
  margin-top: 16px;
  padding: 14px;
  font-size: 1rem;
}

/* ── Log Section ──────────────────────────────────────────────────── */
.log-meal { margin-bottom: 20px; }
.log-meal__title { font-size: 1rem; margin-bottom: 8px; display: flex; align-items: center; justify-content: space-between; }
.log-meal__total { font-size: 0.85rem; color: var(--text-2); font-weight: 400; }

.log-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.log-table th, .log-table td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); }
.log-table th { color: var(--text-2); font-size: 0.75rem; text-transform: uppercase; }

.log-grand-total {
  font-size: 1rem;
  padding: 12px 0;
  border-top: 2px solid var(--border);
  text-align: right;
}

.last-export { font-size: 0.8rem; color: var(--text-2); margin-top: 8px; text-align: right; }
.empty-state { color: var(--text-2); text-align: center; padding: 32px 0; }

/* ── Settings ─────────────────────────────────────────────────────── */
.settings-section { margin-bottom: 24px; }
.settings-section h2 { margin-bottom: 12px; font-size: 1rem; color: var(--text-2); text-transform: uppercase; letter-spacing: 0.05em; }

.drive-status {
  font-size: 0.875rem;
  color: var(--text-2);
  padding: 8px 12px;
  background: var(--bg-3);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
}

.drive-status--connected { color: var(--success); background: rgba(34, 197, 94, 0.1); }

.warning-note {
  font-size: 0.75rem;
  color: var(--warning);
  margin-top: 4px;
}

/* ── Contact ──────────────────────────────────────────────────────── */
.contact-form { display: flex; flex-direction: column; gap: 12px; }
.contact-form label { font-size: 0.875rem; color: var(--text-2); display: block; margin-bottom: 4px; }
.contact-note { font-size: 0.8rem; color: var(--text-2); margin-top: 8px; }

/* ── Donate ───────────────────────────────────────────────────────── */
.donate-intro { color: var(--text-2); line-height: 1.7; margin-bottom: 24px; }
.donate-intro p { margin-bottom: 12px; }

.donate-cards { display: flex; flex-direction: column; gap: 12px; }

.donate-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s, background 0.15s;
}

.donate-card:hover { border-color: var(--accent); background: var(--accent-light); text-decoration: none; }

.donate-card__icon { font-size: 2rem; flex-shrink: 0; width: 48px; text-align: center; }
.donate-card__body { flex: 1; }
.donate-card__title { font-weight: 700; font-size: 1rem; }
.donate-card__sub { font-size: 0.8rem; color: var(--text-2); margin-top: 2px; }

/* ── How-To ───────────────────────────────────────────────────────── */
.how-to-placeholder { color: var(--text-2); text-align: center; padding: 48px 16px; }
.how-to-placeholder h1 { margin-bottom: 12px; color: var(--text); }

/* ── Toast ────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: calc(var(--nav-height) + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  font-size: 0.9rem;
  box-shadow: var(--shadow);
  z-index: 9000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  max-width: calc(100vw - 32px);
  text-align: center;
}

.toast--visible { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast--success { border-color: var(--success); color: var(--success); }
.toast--error { border-color: var(--error); color: var(--error); }
.toast--info { border-color: var(--accent); color: var(--accent); }

/* ── Spinner ──────────────────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Disclaimer ───────────────────────────────────────────────────── */
.disclaimer {
  font-size: 0.75rem;
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  line-height: 1.6;
  margin-top: 16px;
}

.disclaimer strong { color: var(--text); }

/* ── Section Titles ───────────────────────────────────────────────── */
.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
}

/* ── Divider ──────────────────────────────────────────────────────── */
.divider { border: none; border-top: 1px solid var(--border); margin: 16px 0; }

/* ── Desktop ──────────────────────────────────────────────────────── */
@media (min-width: 640px) {
  body { padding-bottom: 0; }
  .bottom-nav { display: none; }

  .app-header { padding: 12px 24px; }
  .app-header nav { display: flex; gap: 4px; }
  .app-header nav .nav-btn {
    flex-direction: row;
    gap: 6px;
    font-size: 0.875rem;
    min-height: 40px;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
  }

  .app-main { padding: 24px; }

  .bolus-summary__total-value { font-size: 4rem; }

  .food-row { grid-template-columns: 1fr 100px 80px 36px; }
}

@media (min-width: 640px) {
  .desktop-nav { display: flex; }
}

/* ── Misc ─────────────────────────────────────────────────────────── */
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

.page-title { font-size: 1.4rem; font-weight: 700; margin-bottom: 20px; }

.text-muted { color: var(--text-2); }
.text-sm { font-size: 0.875rem; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mb-4 { margin-bottom: 4px; }
.mb-8 { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; }