:root {
  --bg: #eef0f6;
  --bg-grad-a: #eef1ff;
  --bg-grad-b: #eafcfb;
  --surface: #ffffff;
  --surface-alt: #f6f7fb;
  --text: #191b23;
  --text-muted: #6b7080;
  --border: #e6e8f0;
  --accent: #6d5efc;
  --accent-2: #22d3ee;
  --accent-contrast: #ffffff;
  --danger: #e6435a;
  --success: #16b981;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(24, 20, 60, 0.05), 0 1px 1px rgba(24, 20, 60, 0.03);
  --shadow-md: 0 8px 24px -8px rgba(24, 20, 60, 0.16), 0 2px 8px -2px rgba(24, 20, 60, 0.08);
  --shadow-lg: 0 24px 48px -16px rgba(24, 20, 60, 0.28);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --bg-grad-a: #14152a;
    --bg-grad-b: #0d1d22;
    --surface: #191b25;
    --surface-alt: #14151e;
    --text: #f2f3f7;
    --text-muted: #9296a8;
    --border: #2a2c3a;
    --accent: #8677ff;
    --accent-2: #34e0e0;
    --accent-contrast: #0b0d16;
    --danger: #ff5d78;
    --success: #29d99a;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px -8px rgba(0, 0, 0, 0.5), 0 2px 8px -2px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 24px 48px -16px rgba(0, 0, 0, 0.6);
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding-bottom: 3rem;
  -webkit-font-smoothing: antialiased;
}

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* ---------- login ---------- */

.login-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  overflow: hidden;
  background: radial-gradient(circle at 20% 15%, var(--bg-grad-a), var(--bg) 55%),
    radial-gradient(circle at 85% 85%, var(--bg-grad-b), var(--bg) 55%);
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.55;
  animation: float 16s ease-in-out infinite;
}

.blob-a {
  width: 320px;
  height: 320px;
  background: var(--accent);
  top: -80px;
  left: -80px;
}

.blob-b {
  width: 280px;
  height: 280px;
  background: var(--accent-2);
  bottom: -100px;
  right: -60px;
  animation-delay: -5s;
  animation-duration: 20s;
}

.blob-c {
  width: 200px;
  height: 200px;
  background: var(--success);
  top: 40%;
  right: 15%;
  opacity: 0.3;
  animation-delay: -10s;
  animation-duration: 24s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -20px) scale(1.08); }
}

.login-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 360px;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 2.25rem 1.75rem 1.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.6rem;
  animation: rise 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes rise {
  from { opacity: 0; transform: translateY(14px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.login-card h1 {
  margin: 0.4rem 0 0;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}

.login-sub {
  margin: 0 0 0.75rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.4;
}

.login-card input {
  text-align: center;
}

.login-btn {
  width: 100%;
  justify-content: center;
}

.login-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin: 0.25rem 0 0;
}

.login-card.shake {
  animation: shake 0.32s;
}

@keyframes shake {
  10%, 90% { transform: translateX(-1px); }
  20%, 80% { transform: translateX(2px); }
  30%, 50%, 70% { transform: translateX(-4px); }
  40%, 60% { transform: translateX(4px); }
}

.brand-mark {
  width: 52px;
  height: 52px;
  filter: drop-shadow(0 6px 16px color-mix(in srgb, var(--accent) 45%, transparent));
}

.brand-mark svg {
  width: 100%;
  height: 100%;
}

.brand-mark-sm {
  width: 28px;
  height: 28px;
  filter: none;
}

/* ---------- app shell ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0.7rem 1rem 0;
}

.topbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand h1 {
  margin: 0;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.tabs {
  position: relative;
  display: flex;
  gap: 0.25rem;
}

.tab-btn {
  flex: 1;
  padding: 0.65rem 0.5rem;
  background: none;
  border: none;
  font-size: 0.88rem;
  color: var(--text-muted);
  cursor: pointer;
  position: relative;
  z-index: 1;
  transition: color 0.2s ease;
}

.tab-btn.active {
  color: var(--accent);
  font-weight: 600;
}

.tab-indicator {
  position: absolute;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: transform 0.28s cubic-bezier(0.65, 0, 0.35, 1), width 0.28s cubic-bezier(0.65, 0, 0.35, 1);
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeSlide 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.1rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.card h2 {
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.card-head-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.card-head-row h2 {
  margin: 0;
}

/* ---------- day nav ---------- */

.day-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
}

.day-label-wrap {
  position: relative;
  flex: 1;
  text-align: center;
}

.day-label {
  font-weight: 600;
  font-size: 0.95rem;
}

.day-label-wrap input[type="date"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
  padding: 0;
  border: none;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 2.35rem;
  height: 2.35rem;
  cursor: pointer;
  color: var(--text);
  flex-shrink: 0;
  transition: background 0.15s ease, transform 0.1s ease;
}

.icon-btn svg {
  width: 18px;
  height: 18px;
}

.icon-btn:hover {
  background: color-mix(in srgb, var(--accent) 12%, var(--surface-alt));
  color: var(--accent);
}

.icon-btn:active {
  transform: scale(0.94);
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.88rem;
  padding: 0.4rem 0.2rem;
}

/* ---------- totals ---------- */

.totals-card {
  text-align: center;
  background: linear-gradient(160deg, color-mix(in srgb, var(--accent) 10%, var(--surface)), var(--surface) 60%);
}

.total-carbs {
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

.total-carbs .unit {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 0.35rem;
  -webkit-text-fill-color: var(--text-muted);
}

.sub-totals {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.28rem 0.65rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.chip .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

/* ---------- forms ---------- */

form.stack {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.32rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

input, select {
  font-size: 1rem;
  font-family: inherit;
  padding: 0.6rem 0.7rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  width: 100%;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.search-wrap {
  position: relative;
  margin-bottom: 0.85rem;
}

.search-icon {
  position: absolute;
  left: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  width: 17px;
  height: 17px;
  color: var(--text-muted);
  pointer-events: none;
}

#option-search {
  padding-left: 2.3rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

@media (max-width: 420px) {
  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }
}

.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 60%, var(--accent-2)));
  color: var(--accent-contrast);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.7rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 6px 16px -6px color-mix(in srgb, var(--accent) 60%, transparent);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.primary-btn svg {
  width: 17px;
  height: 17px;
}

.primary-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px -6px color-mix(in srgb, var(--accent) 65%, transparent);
}

.primary-btn:active {
  transform: translateY(0);
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ---------- lists ---------- */

.entry-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.entry-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-alt);
  animation: fadeSlide 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  transition: border-color 0.15s ease, transform 0.12s ease;
}

.entry-item:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}

.entry-main {
  min-width: 0;
}

.entry-name {
  font-weight: 600;
  font-size: 0.94rem;
}

.entry-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 0.1rem;
}

.entry-carbs {
  font-weight: 700;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.entry-actions {
  display: flex;
  gap: 0.3rem;
  flex-shrink: 0;
}

.entry-actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.9rem;
  height: 1.9rem;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-muted);
  transition: background 0.15s ease, color 0.15s ease;
}

.entry-actions button svg {
  width: 15px;
  height: 15px;
}

.entry-actions button:hover {
  background: var(--border);
  color: var(--text);
}

.entry-actions button.danger:hover {
  background: color-mix(in srgb, var(--danger) 15%, transparent);
  color: var(--danger);
}

.empty-msg {
  color: var(--text-muted);
  font-size: 0.88rem;
  text-align: center;
  margin: 0.75rem 0 0.25rem;
}

/* ---------- weight ---------- */

.weight-delta {
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--surface-alt);
  color: var(--text-muted);
}

.weight-delta.down {
  color: var(--success);
  background: color-mix(in srgb, var(--success) 15%, transparent);
}

.weight-delta.up {
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 15%, transparent);
}

.chart {
  width: 100%;
  overflow-x: auto;
}

.chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.chart-point {
  transition: r 0.15s ease;
}

.chart-point:hover {
  r: 5;
}

/* ---------- toast ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.25rem;
  transform: translateX(-50%) translateY(0);
  background: var(--text);
  color: var(--bg);
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 20;
  box-shadow: var(--shadow-md);
  animation: toastIn 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.toast.error {
  background: var(--danger);
  color: #fff;
}