/* ===================================================================
   Stomach Pain Tracker - Mobile-first CSS
   =================================================================== */

:root {
  --green: #22c55e;
  --green-bg: #f0fdf4;
  --orange: #f59e0b;
  --orange-bg: #fffbeb;
  --red: #ef4444;
  --red-bg: #fef2f2;
  --blue: #3b82f6;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.5;
  padding-bottom: env(safe-area-inset-bottom, 0);
}

[hidden] { display: none !important; }

/* ---------- Header ---------- */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  padding: 12px 16px 0;
}

.title {
  font-size: 1.2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
}

.tabs { display: flex; gap: 4px; }

.tab {
  flex: 1;
  padding: 10px 0 12px;
  border: none;
  background: none;
  font-size: .95rem;
  font-weight: 500;
  color: var(--gray-500);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  -webkit-tap-highlight-color: transparent;
  transition: color .15s, border-color .15s;
}

.tab.active { color: var(--blue); border-bottom-color: var(--blue); }

/* ---------- Layout ---------- */

.main { padding: 16px; max-width: 640px; margin: 0 auto; }

.page { display: none; }
.page.active { display: block; }

/* ---------- Form ---------- */

.field { margin-bottom: 18px; }

.label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: .9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--gray-700);
}

.required { color: var(--red); }

.input, .textarea, select.input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  background: #fff;
  color: var(--gray-900);
  -webkit-appearance: none;
  appearance: none;
  transition: border-color .15s;
}

.input:focus, .textarea:focus { outline: none; border-color: var(--blue); }

.textarea { resize: vertical; min-height: 60px; }

.input-sm { padding: 8px 10px; font-size: .85rem; border-radius: 8px; }

.field-row { display: flex; gap: 12px; }
.field-row .field { flex: 1; }

.field-err {
  color: var(--red);
  font-size: .8rem;
  margin-top: 6px;
  min-height: 0;
}

.field-err:empty { display: none; }

/* ---------- Button groups ---------- */

.btn-group { display: flex; flex-wrap: wrap; gap: 8px; }
.btn-group.grid-3 > .btn-opt { flex: 1 1 calc(33.333% - 8px); }
.btn-group.grid-4 > .btn-opt { flex: 1 1 calc(25% - 8px); }

.btn-group > .btn-opt, .btn-group > label.btn-opt {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  background: #fff;
  font-size: .88rem;
  text-align: center;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: background .12s, border-color .12s, color .12s;
}

.btn-group input[type="radio"],
.btn-group input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.btn-opt:has(input:checked) {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
  font-weight: 600;
}

.btn-opt.warn:has(input:checked) { background: var(--orange); border-color: var(--orange); }
.btn-opt.danger:has(input:checked) { background: var(--red); border-color: var(--red); }

.btn-opt:active { transform: scale(.97); }

/* ---------- Range ---------- */

.range {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  -webkit-appearance: none;
  appearance: none;
  background: linear-gradient(90deg, var(--green), var(--orange), var(--red));
  outline: none;
}

.range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--blue);
  box-shadow: var(--shadow);
  cursor: pointer;
}

.range::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--blue);
  cursor: pointer;
}

.range-scale {
  display: flex;
  justify-content: space-between;
  font-size: .75rem;
  color: var(--gray-400);
  margin-top: 6px;
}

.severity-badge {
  font-size: .8rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--gray-100);
  color: var(--gray-700);
}

.severity-badge.lv-light { background: var(--green-bg); color: #15803d; }
.severity-badge.lv-mid { background: var(--orange-bg); color: #b45309; }
.severity-badge.lv-heavy { background: var(--red-bg); color: #b91c1c; }

/* ---------- Details ---------- */

.details {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  background: #fff;
  margin-bottom: 18px;
  overflow: hidden;
}

.details > summary {
  padding: 14px 16px;
  font-size: .92rem;
  font-weight: 600;
  color: var(--gray-700);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.details > summary::-webkit-details-marker { display: none; }
.details > summary::after { content: "▾"; color: var(--gray-400); transition: transform .15s; }
.details[open] > summary::after { transform: rotate(180deg); }

.details-body { padding: 16px; border-top: 1px solid var(--gray-100); }

/* ---------- Buttons ---------- */

.btn-submit {
  width: 100%;
  padding: 15px;
  border: none;
  border-radius: var(--radius);
  background: var(--blue);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: opacity .15s;
}

.btn-submit:disabled { opacity: .6; cursor: default; }

.btn-sm {
  padding: 8px 14px;
  border: 1px solid var(--blue);
  border-radius: 8px;
  background: var(--blue);
  color: #fff;
  font-size: .85rem;
  cursor: pointer;
  white-space: nowrap;
}

.btn-sm.btn-outline { background: #fff; color: var(--gray-700); border-color: var(--gray-300); }
.btn-sm:disabled { opacity: .5; }

.form-msg { margin-top: 12px; text-align: center; font-size: .9rem; }
.form-msg.ok { color: var(--green); }
.form-msg.err { color: var(--red); }

/* ---------- Edit banner ---------- */

.edit-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  margin-bottom: 16px;
  border-radius: 10px;
  background: var(--orange-bg);
  border: 1px solid #fde68a;
  color: #92400e;
  font-size: .88rem;
}

/* ---------- History ---------- */

.list-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.list-toolbar .input-sm { flex: 1 1 110px; min-width: 0; }
.toolbar-sep { color: var(--gray-400); font-size: .85rem; }

.list-container { display: flex; flex-direction: column; gap: 12px; }

.record-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px;
  border-left: 4px solid var(--gray-300);
  cursor: pointer;
}

.record-card.lv-light { border-left-color: var(--green); }
.record-card.lv-mid { border-left-color: var(--orange); }
.record-card.lv-heavy { border-left-color: var(--red); }

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 6px;
}

.card-time { font-weight: 600; font-size: .95rem; }
.card-sev { font-size: .85rem; font-weight: 600; }
.card-sev.lv-light { color: #15803d; }
.card-sev.lv-mid { color: #b45309; }
.card-sev.lv-heavy { color: #b91c1c; }

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: .82rem;
  color: var(--gray-500);
  margin-bottom: 8px;
}

.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }

.tag {
  font-size: .75rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--gray-100);
  color: var(--gray-700);
}

.tag.trigger { background: #eff6ff; color: #1d4ed8; }
.tag.good { background: var(--green-bg); color: #15803d; }

.card-note {
  font-size: .85rem;
  color: var(--gray-500);
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 8px;
}

.card-actions { display: flex; gap: 8px; justify-content: flex-end; }

.card-actions button {
  padding: 6px 12px;
  font-size: .8rem;
  border-radius: 8px;
  border: 1px solid var(--gray-300);
  background: #fff;
  color: var(--gray-700);
  cursor: pointer;
}

.card-actions .btn-del { color: var(--red); border-color: #fecaca; }

.ongoing {
  display: inline-block;
  font-size: .72rem;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--orange-bg);
  color: #b45309;
  font-weight: 600;
}

.empty {
  padding: 48px 16px;
  text-align: center;
  color: var(--gray-400);
  font-size: .9rem;
}

.pager {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  padding: 20px 0;
  font-size: .85rem;
  color: var(--gray-500);
}

/* ---------- AI analysis ---------- */

.ai-controls { display: flex; gap: 8px; align-items: center; }
.ai-controls .input-sm { flex: 0 0 120px; }

.ai-result {
  margin-top: 12px;
  padding: 12px;
  border-radius: 8px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  font-size: .85rem;
  line-height: 1.7;
  color: var(--gray-700);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 60vh;
  overflow-y: auto;
}

.ai-result.loading { color: var(--gray-400); text-align: center; }
.ai-result.error { background: var(--red-bg); border-color: #fecaca; color: #b91c1c; }

.ai-note { margin-top: 10px; font-size: .72rem; color: var(--gray-400); }

/* ---------- Stats ---------- */

.stats-loading { padding: 40px; text-align: center; color: var(--gray-400); }

.overview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.overview-cell {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px 8px;
  text-align: center;
}

.overview-value { font-size: 1.4rem; font-weight: 700; color: var(--blue); }
.overview-label { font-size: .72rem; color: var(--gray-500); margin-top: 2px; }

.stat-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 14px;
}

.stat-card h3 {
  font-size: .9rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.stat-hint { font-size: .72rem; font-weight: 400; color: var(--gray-400); }

.bar-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  font-size: .82rem;
}

.bar-name { flex: 0 0 84px; color: var(--gray-700); text-align: right; }
.bar-track { flex: 1; height: 16px; background: var(--gray-100); border-radius: 4px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--blue); border-radius: 4px; min-width: 2px; transition: width .3s; }
.bar-fill.trigger { background: #60a5fa; }
.bar-fill.good { background: var(--green); }
.bar-cnt { flex: 0 0 32px; color: var(--gray-500); font-size: .78rem; }

.month-chart { display: flex; align-items: flex-end; gap: 8px; height: 120px; padding-top: 8px; }
.month-col { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; height: 100%; justify-content: flex-end; }
.month-bar { width: 100%; max-width: 40px; background: var(--blue); border-radius: 4px 4px 0 0; min-height: 2px; }
.month-label { font-size: .68rem; color: var(--gray-400); }
.month-val { font-size: .72rem; color: var(--gray-500); }

.last-card { margin-bottom: 14px; }

@media (max-width: 380px) {
  .overview-grid { grid-template-columns: repeat(2, 1fr); }
  .btn-group.grid-4 > .btn-opt { flex: 1 1 calc(50% - 8px); }
  .field-row { flex-direction: column; gap: 0; }
}