/**
 * Shared UI theme — dark/light mode, mobile-friendly.
 * Apps: fluid-calculator, renal-fluid-calculator, qtc-calculator, etc.
 */

/* —— Dark mode (default) —— */
:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #242736;
  --border: #2e3246;
  --accent: #20b2aa;
  --accent2: #4ecdc4;
  --accent-on: #0f1117;
  --warn: #f59e0b;
  --danger: #ef4444;
  --success: #22c55e;
  --text: #e2e8f0;
  --muted: #8892a4;
  --radius: 12px;
  --tab-h: 64px;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
}

/* —— Light mode —— */
html.theme-light {
  --bg: #f1f5f9;
  --surface: #ffffff;
  --surface2: #e2e8f0;
  --border: #cbd5e1;
  --accent: #0d9488;
  --accent2: #14b8a6;
  --accent-on: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
}

html.theme-light .stat.highlight,
html.theme-light .stat.hi {
  background: rgba(13, 148, 136, 0.08);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  height: 100%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  min-height: 100%;
  padding-top: var(--safe-t);
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
}

/* —— Layout shells —— */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px calc(20px + var(--safe-r)) 24px calc(20px + var(--safe-l));
}

@media (max-width: 600px) {
  .container {
    padding: 16px calc(16px + var(--safe-r)) 20px calc(16px + var(--safe-l));
  }
}

.app-header-center {
  text-align: center;
  padding: 24px 0 20px;
}

@media (max-width: 600px) {
  .app-header-center {
    padding: 20px 0 16px;
  }
}

.app-header-center h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
  line-height: 1.3;
}

@media (max-width: 600px) {
  .app-header-center h1 {
    font-size: 1.4rem;
  }
}

.app-header-center p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 6px;
  line-height: 1.4;
}

/* —— Cards —— */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 14px;
}

@media (max-width: 600px) {
  .card {
    padding: 16px;
    margin-bottom: 12px;
  }
}

.card-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.card h2 {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

/* —— Form fields —— */
.field {
  margin-bottom: 14px;
}

.field:last-child {
  margin-bottom: 0;
}

.field label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
  font-weight: 500;
  line-height: 1.3;
}

.field input,
.field select,
.form-group input[type="number"],
.form-group input[type="text"],
.form-group select {
  width: 100%;
  background: var(--surface2);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 13px 14px;
  color: var(--text);
  font-size: 1rem;
  transition: border-color 0.2s;
  appearance: none;
  -webkit-appearance: none;
  min-height: 44px;
}

.field input:focus,
.field select:focus,
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.field select,
.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238892a4' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

html.theme-light .field select,
html.theme-light .form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2364748b' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
}

.hint,
.field .hint {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 5px;
  line-height: 1.45;
}

.field .unit {
  font-size: 0.8rem;
  color: var(--accent2);
  margin-left: 4px;
}

.row2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  min-width: 0;
}

@media (max-width: 520px) {
  .row2 {
    grid-template-columns: 1fr;
  }
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 600px) {
  .grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
}

/* —— Buttons —— */
.btn {
  width: 100%;
  padding: 12px 14px;
  background: var(--accent);
  color: var(--accent-on);
  font-weight: 700;
  font-size: 1rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  margin-top: 8px;
  transition: background 0.2s;
  min-height: 44px;
  touch-action: manipulation;
}

.btn:hover {
  background: var(--accent2);
}

.btn-reset {
  background: var(--surface2);
  color: var(--muted);
  border: 1px solid var(--border);
  margin-top: 6px;
  font-weight: 600;
}

.btn-reset:hover {
  background: var(--border);
  color: var(--text);
}

.btn-primary {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: var(--accent-on);
  border: none;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
  min-height: 44px;
  margin-top: 8px;
  touch-action: manipulation;
}

.btn-primary:hover {
  background: var(--accent2);
}

/* —— Stat blocks —— */
.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  min-width: 0;
}

.stat-grid.cols3 {
  grid-template-columns: 1fr 1fr 1fr;
}

@media (max-width: 600px) {
  .stat-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 360px) {
  .stat-grid.cols3 {
    grid-template-columns: 1fr 1fr;
  }
}

.stat {
  background: var(--surface2);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  min-width: 0;
}

.stat.highlight,
.stat.hi {
  border-color: var(--accent);
  background: rgba(32, 178, 170, 0.07);
}

.stat.pos {
  border-color: var(--success);
  background: rgba(34, 197, 94, 0.06);
}

.stat.neg {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.06);
}

.stat.warn {
  border-color: var(--warn);
  background: rgba(245, 158, 11, 0.07);
}

.stat .lbl,
.stat .label {
  font-size: 0.68rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.stat .val,
.stat .value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  margin-top: 4px;
  line-height: 1.2;
}

.stat .val span,
.stat .value span {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 400;
  margin-left: 2px;
}

.stat .val.ok {
  color: var(--success);
}

.stat .val.flag {
  color: var(--danger);
}

.stat .sub {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 3px;
  line-height: 1.35;
}

/* —— Alerts —— */
.alert {
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 0.85rem;
  line-height: 1.55;
  margin-top: 10px;
}

.alert-ok {
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: var(--success);
}

.alert-danger {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--danger);
}

.alert-warn {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--warn);
}

.alert-info {
  background: rgba(32, 178, 170, 0.1);
  border: 1px solid rgba(32, 178, 170, 0.2);
  color: var(--accent2);
}

.alert strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 3px;
}

.alert p {
  opacity: 0.92;
}

/* —— Misc —— */
.divider {
  height: 1px;
  background: var(--border);
  margin: 14px 0;
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--muted);
  cursor: pointer;
  min-height: 44px;
  padding: 8px 0;
  line-height: 1.4;
}

.checkbox-row input[type="checkbox"] {
  width: 22px;
  height: 22px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 2px;
}

.page-header {
  padding: 8px 0 18px;
}

.page-header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.3;
}

@media (max-width: 600px) {
  .page-header h1 {
    font-size: 1.2rem;
  }
}

.page-header p {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 4px;
  line-height: 1.4;
}

.page-footer,
footer.app-footer {
  text-align: center;
  padding: 12px 0 10px;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.6;
}

footer.app-footer a {
  color: var(--accent);
  text-decoration: none;
}

.breakdown {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.75;
}

.breakdown b {
  color: var(--text);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
}

.badge-green {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.badge-amber {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warn);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-red {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.results {
  display: none;
  margin-top: 16px;
  flex-direction: column;
  gap: 16px;
}

.results.show {
  display: flex;
}

.section-full {
  grid-column: 1 / -1;
}

/* —— Theme toggle button —— */
.theme-toggle {
  position: fixed;
  top: calc(12px + var(--safe-t));
  right: calc(12px + var(--safe-r));
  z-index: 1000;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: border-color 0.2s, color 0.2s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  touch-action: manipulation;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.theme-toggle:focus {
  outline: none;
  border-color: var(--accent);
}

html.theme-light .theme-toggle {
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* Light mode: tab bars and desktop nav (fluid-app, qtc-ecg) */
html.theme-light .fluid-app .tab-bar,
html.theme-light .tab-bar {
  background: rgba(255, 255, 255, 0.97);
}

html.theme-light .fluid-app .desktop-nav,
html.theme-light .desktop-nav {
  background: rgba(241, 245, 249, 0.95);
}