:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-2: #f0f3f9;
  --text: #1a1d24;
  --text-soft: #5a6172;
  --accent: #3b82f6;
  --accent-2: #2563eb;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --border: #e2e6ee;
  --shadow: 0 2px 8px rgba(20, 30, 60, 0.06);
  --radius: 14px;

  --c-protein: #ef4444;
  --c-carb:    #f59e0b;
  --c-fat:     #8b5cf6;
}

[data-theme="dark"] {
  --bg: #0f1419;
  --surface: #1a1f2a;
  --surface-2: #232a37;
  --text: #e6e9f0;
  --text-soft: #9aa3b5;
  --accent: #60a5fa;
  --accent-2: #3b82f6;
  --border: #2c3340;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "Inter", "Sarabun", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  transition: background .2s, color .2s;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 28px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: var(--shadow);
}
.topbar h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}
.subtitle {
  color: var(--text-soft);
  font-weight: 400;
  font-size: 0.95rem;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.profile-select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  min-width: 140px;
  max-width: 200px;
}

.icon-btn, .theme-btn {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  border-radius: 50%;
  width: 40px; height: 40px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: transform .15s;
}
.theme-btn:hover { transform: rotate(15deg); }
.icon-btn:hover { background: var(--accent); color: #fff; }

.dropdown-menu {
  position: fixed;
  top: 68px;
  right: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
  padding: 6px;
  z-index: 50;
  min-width: 220px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.dropdown-menu button {
  text-align: left;
  background: transparent;
  border: none;
  color: var(--text);
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 0.92rem;
  cursor: pointer;
}
.dropdown-menu button:hover { background: var(--surface-2); }
.dropdown-menu hr { border: none; border-top: 1px solid var(--border); margin: 4px 0; }

.log-btn {
  margin-top: 14px;
  width: 100%;
  padding: 12px;
  border: 1px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  color: var(--accent);
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
}
.log-btn:hover { background: var(--accent); color: #fff; }
.log-feedback {
  margin-top: 8px;
  padding: 8px 12px;
  background: color-mix(in srgb, var(--success) 15%, transparent);
  border-left: 3px solid var(--success);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.88rem;
}

/* History table */
.history-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 0.9rem;
}
.history-table th, .history-table td {
  padding: 8px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.history-table th {
  background: var(--surface-2);
  color: var(--text-soft);
  font-weight: 600;
  font-size: 0.82rem;
}
.history-table tbody tr:hover { background: var(--surface-2); }
.delete-row {
  background: transparent;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 1rem;
  padding: 2px 6px;
  border-radius: 4px;
}
.delete-row:hover { background: color-mix(in srgb, var(--danger) 15%, transparent); }
.history-empty {
  text-align: center;
  padding: 20px;
  color: var(--text-soft);
  background: var(--surface-2);
  border-radius: 10px;
  font-size: 0.92rem;
}

/* Chart */
.chart-wrap {
  background: var(--surface-2);
  padding: 12px;
  border-radius: 10px;
  margin-bottom: 12px;
}
#chart {
  width: 100%;
  height: 200px;
  display: block;
}
.chart-legend {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 4px;
  font-size: 0.85rem;
  color: var(--text-soft);
}
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot-weight { background: var(--accent); }
.dot-bf { background: var(--warning); }

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 24px 16px 80px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 22px;
  box-shadow: var(--shadow);
}

h2 {
  margin: 0 0 16px;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
h2 .en {
  font-weight: 400;
  color: var(--text-soft);
  font-size: 0.9rem;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 12px;
}
@media (max-width: 560px) {
  .row { grid-template-columns: 1fr; }
}

.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
  font-size: 0.92rem;
  color: var(--text-soft);
}
.field label .en { font-size: 0.82rem; }
.field input[type="number"],
.field input[type="range"] {
  width: 100%;
}
input[type="number"] {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--surface-2);
  border-radius: 3px;
  border: 1px solid var(--border);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px; height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid var(--surface);
  box-shadow: 0 0 4px rgba(0,0,0,0.2);
}
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid var(--surface);
}

.radio-group { display: flex; gap: 14px; }
.radio {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 10px;
  cursor: pointer;
  flex: 1;
  justify-content: center;
  font-weight: 500;
}
.radio:has(input:checked) {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.note {
  margin: 12px 0;
  padding: 12px 14px;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  font-size: 0.92rem;
  color: var(--text);
}

.bf-figure {
  margin: 14px 0;
  text-align: center;
}
.bf-figure img {
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  cursor: zoom-in;
  transition: transform .2s;
}
.bf-figure img:hover { transform: scale(1.01); }
.bf-figure figcaption {
  margin-top: 6px;
  font-size: 0.85rem;
  color: var(--text-soft);
}

.auto-calc {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  padding: 12px 14px;
  background: var(--surface-2);
  border-radius: 10px;
  margin-top: 14px;
  font-size: 0.95rem;
}
.auto-calc > div { flex: 1; min-width: 180px; }
.auto-calc span { color: var(--text-soft); }
.auto-calc b { color: var(--accent); font-weight: 700; }

.activity-list { display: flex; flex-direction: column; gap: 8px; }
.activity {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 10px;
  cursor: pointer;
}
.activity:has(input:checked) {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}
.activity b { color: var(--accent); margin-right: 4px; }
.activity i { color: var(--text-soft); font-style: italic; font-size: 0.88rem; }

/* Result card */
.result-card {
  background: linear-gradient(135deg, var(--surface), var(--surface-2));
}
.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
@media (max-width: 560px) {
  .result-grid { grid-template-columns: 1fr; }
}
.result-box {
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: center;
}
.result-box.highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  border-color: transparent;
}
.result-box.highlight .result-label,
.result-box.highlight .result-sub { color: rgba(255,255,255,0.85); }
.result-label { font-size: 0.9rem; color: var(--text-soft); font-weight: 600; letter-spacing: .5px; }
.result-value {
  font-size: 2rem;
  font-weight: 800;
  margin: 4px 0;
}
.result-value small { font-size: 0.85rem; font-weight: 500; opacity: .85; }
.result-sub { font-size: 0.78rem; color: var(--text-soft); }

.formula-detail {
  margin-top: 14px;
  background: var(--surface-2);
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 0.9rem;
}
.formula-detail summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.formula-detail p { margin: 8px 0 0; color: var(--text-soft); font-family: ui-monospace, monospace; word-break: break-word; }

/* Goal tabs */
.goal-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 12px;
}
.goal-tab {
  text-align: center;
  padding: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
}
.goal-tab input { display: none; }
.goal-tab:has(input:checked) {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
}

.goal-pct { margin-top: 8px; }
.goal-pct label { font-size: 0.95rem; }
.goal-pct input[type="range"] { width: 100%; margin-top: 6px; }
.hint {
  font-size: 0.85rem;
  color: var(--text-soft);
  margin: 6px 0;
}

.target-out {
  margin-top: 12px;
  padding: 14px;
  background: color-mix(in srgb, var(--success) 12%, transparent);
  border-left: 3px solid var(--success);
  border-radius: 8px;
  font-size: 1rem;
}
.target-out b { color: var(--success); font-size: 1.3rem; }
.target-out small { display: block; color: var(--text-soft); font-size: 0.82rem; margin-top: 2px; }

/* Protein info */
.info-btn {
  border: none;
  background: var(--surface-2);
  color: var(--accent);
  border-radius: 50%;
  width: 24px; height: 24px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 700;
}
.popover {
  background: var(--surface-2);
  padding: 12px 14px;
  border-radius: 10px;
  margin-bottom: 12px;
  font-size: 0.9rem;
  border-left: 3px solid var(--accent);
}
.popover ul { margin: 6px 0 0; padding-left: 22px; }
.popover li { margin-bottom: 3px; }

/* Preset grid */
.preset-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 16px;
}
@media (max-width: 560px) {
  .preset-grid { grid-template-columns: 1fr; }
}
.preset { cursor: pointer; }
.preset > input[type="radio"] { display: none; }
.preset input[type="range"] { width: 100%; margin: 8px 0; }
.preset input[type="range"]:disabled { opacity: 0.4; cursor: not-allowed; }
.preset-card {
  padding: 14px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 12px;
  height: 100%;
  transition: border-color .15s, background .15s;
}
.preset:has(input:checked) .preset-card {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}
.preset-name { font-weight: 700; font-size: 1.05rem; }
.preset-ratio { color: var(--accent); font-weight: 600; margin-bottom: 6px; font-size: 0.92rem; }
.preset-desc { font-size: 0.82rem; color: var(--text-soft); line-height: 1.5; }

/* Macro summary */
.macro-summary {
  background: var(--surface-2);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.macro-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--surface);
  border-radius: 8px;
  border-left: 4px solid;
}
.macro-p { border-color: var(--c-protein); }
.macro-c { border-color: var(--c-carb); }
.macro-f { border-color: var(--c-fat); }
.macro-name { font-weight: 600; }
.macro-vals { font-size: 0.92rem; color: var(--text-soft); }
.macro-vals b { color: var(--text); font-weight: 700; }
.macro-total {
  text-align: right;
  margin-top: 4px;
  font-weight: 600;
  color: var(--text-soft);
}
.macro-total b { color: var(--accent); font-size: 1.1rem; }

.footer-note {
  text-align: center;
  color: var(--text-soft);
  padding: 10px 0;
}

.hidden { display: none !important; }

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}
.lightbox img {
  max-width: 95%;
  max-height: 90vh;
  border-radius: 10px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.6);
}
#lightboxClose {
  position: absolute;
  top: 20px; right: 24px;
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 44px; height: 44px;
  font-size: 1.4rem;
  cursor: pointer;
}