/* Macro Calculator: light/dark via prefers-color-scheme */

:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --hairline: #e1e0d9;
  --border: rgba(11, 11, 11, 0.10);
  --accent: #2a78d6;
  --warn-bg: rgba(250, 178, 25, 0.12);
  --warn-edge: #b97e06;
  /* series (validated categorical slots 1–3) */
  --protein: #2a78d6;
  --carbs: #eb6834;
  --fat: #1baf7a;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --muted: #898781;
    --hairline: #2c2c2a;
    --border: rgba(255, 255, 255, 0.10);
    --accent: #3987e5;
    --warn-bg: rgba(250, 178, 25, 0.10);
    --warn-edge: #fab219;
    --protein: #3987e5;
    --carbs: #d95926;
    --fat: #199e70;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.55;
  position: relative;
  overflow-x: hidden;
}

/* ambient background: two slow-drifting color fields, never interactive */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(38rem 30rem at 12% -8%, color-mix(in srgb, var(--protein) 16%, transparent), transparent 60%),
    radial-gradient(34rem 28rem at 92% 18%, color-mix(in srgb, var(--fat) 13%, transparent), transparent 60%),
    radial-gradient(30rem 26rem at 50% 100%, color-mix(in srgb, var(--carbs) 10%, transparent), transparent 60%);
  animation: driftField 34s ease-in-out infinite alternate;
}
@keyframes driftField {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(-1.5%, 2%, 0) scale(1.06); }
}
@media (prefers-reduced-motion: reduce) {
  body::before { animation: none; }
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

/* scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

/* header */
.hero {
  text-align: center;
  margin-bottom: 1.5rem;
  animation: heroIn 0.7s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}
.hero h1 { margin: 0 0 0.35rem; font-size: 2rem; letter-spacing: -0.02em; text-wrap: balance; }
.tagline { margin: 0 auto; max-width: 34rem; color: var(--ink-2); text-wrap: balance; }
@keyframes heroIn {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .hero { animation: none; }
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.78rem;
  color: var(--ink-2);
  text-decoration: none;
  transition: transform 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
a.badge:hover, a.badge:focus-visible {
  transform: translateY(-1px);
  border-color: var(--accent);
  color: var(--ink);
}

/* language + explanation register controls */
.top-controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.6rem 1.5rem;
  margin-top: 1rem;
}
.register-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
}
.register-label { font-size: 0.8rem; color: var(--muted); }
.seg-register label { font-size: 0.85rem; padding: 0.35rem 0.85rem; }

.lang-select {
  font: inherit;
  font-size: 0.85rem;
  padding: 0.4rem 0.7rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}
.lang-select:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.muted-card { color: var(--ink-2); text-align: center; }

/* unit segmented control */
.units-row { border: 0; padding: 0; margin: 0 0 1.25rem; }
.seg {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label {
  padding: 0.45rem 1rem;
  cursor: pointer;
  color: var(--ink-2);
  font-size: 0.95rem;
}
.seg input:checked + label {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
.seg input:focus-visible + label { outline: 2px solid var(--accent); outline-offset: -2px; }

/* form */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}
.field { margin-bottom: 1rem; }
.field label { display: block; font-weight: 600; margin-bottom: 0.3rem; }
.unit { color: var(--muted); font-weight: 400; font-size: 0.85em; }
.hint { margin: 0 0 0.5rem; font-size: 0.85rem; color: var(--ink-2); }

input[type="number"], select {
  width: 100%;
  padding: 0.55rem 0.7rem;
  font: inherit;
  color: var(--ink);
  background: var(--page);
  border: 1px solid var(--hairline);
  border-radius: 8px;
}
input[type="number"]:focus-visible, select:focus-visible, input[type="range"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; }

.blend-row { display: flex; align-items: center; gap: 0.75rem; }
.blend-row input[type="range"] { flex: 1; accent-color: var(--accent); }
.blend-end { font-size: 0.8rem; color: var(--muted); white-space: nowrap; }

.g-value { font-weight: 700; font-size: 1.05em; }
.g-day { font-weight: 400; font-size: 0.82em; color: var(--muted); }

/* slider value bubble */
.slider-wrap { position: relative; flex: 1; display: flex; }
.slider-wrap input[type="range"] { width: 100%; accent-color: var(--accent); }
.slider-bubble {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: var(--ink);
  color: var(--page);
  border-radius: 8px;
  padding: 0.35rem 0.65rem;
  text-align: center;
  white-space: nowrap;
  font-size: 0.72rem;
  line-height: 1.25;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.12s ease, transform 0.12s ease;
  z-index: 5;
}
.slider-bubble strong {
  display: block;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.slider-bubble::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--ink);
}
.slider-bubble.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .slider-bubble { transition: none; }
}

/* macro slider zone feedback */
.zone-feedback { margin-top: 0.6rem; }
.zone-feedback p {
  margin: 0.45rem 0 0;
  font-size: 0.88rem;
  color: var(--ink-2);
}
.zone-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  border: 1px solid var(--border);
}
.zone-good     { background: color-mix(in srgb, #0ca30c 14%, transparent); border-color: #0ca30c; }
.zone-neutral  { background: color-mix(in srgb, var(--accent) 12%, transparent); border-color: var(--accent); }
.zone-serious  { background: color-mix(in srgb, #ec835a 16%, transparent); border-color: #ec835a; }
.zone-critical { background: color-mix(in srgb, #d03b3b 14%, transparent); border-color: #d03b3b; }

/* results */
.hero-number { text-align: center; margin-bottom: 1.5rem; }
.hero-value { font-size: 3rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.hero-unit { font-size: 1.25rem; font-weight: 500; color: var(--ink-2); }

.section-title {
  font-size: 1rem;
  margin: 1.75rem 0 0.75rem;
  color: var(--ink-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* stacked macro bar: thin marks, 2px surface gaps, 4px rounded outer ends */
.macro-bar {
  display: flex;
  gap: 2px;
  height: 26px;
  margin-bottom: 0.6rem;
}
.seg-fill {
  min-width: 4px;
  transition: width 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.seg-fill:first-child { border-radius: 4px 0 0 4px; }
.seg-fill:last-child { border-radius: 0 4px 4px 0; }
.protein { background: var(--protein); }
.carbs { background: var(--carbs); }
.fat { background: var(--fat); }
@media (prefers-reduced-motion: reduce) {
  .seg-fill { transition: none; }
}

.legend { display: flex; flex-wrap: wrap; gap: 0.4rem 1.25rem; margin-bottom: 1rem; }
.legend-item { display: flex; align-items: center; gap: 0.4rem; font-size: 0.9rem; }
.swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.legend-name { color: var(--ink-2); }
.legend-val { font-weight: 600; }

.macro-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.macro-table th, .macro-table td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--hairline);
}
.macro-table th { color: var(--muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
.macro-table td:nth-child(2), .macro-table td:nth-child(3) { font-variant-numeric: tabular-nums; white-space: nowrap; }
.macro-table td:last-child { color: var(--ink-2); font-size: 0.85rem; }

/* stat tiles */
.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
}
.tile {
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.tile:hover { transform: translateY(-2px); border-color: var(--accent); }
.tile-label { font-size: 0.8rem; color: var(--muted); }
.tile-value { font-size: 1.4rem; font-weight: 700; margin: 0.15rem 0; font-variant-numeric: tabular-nums; }
.tile-sub { font-size: 0.8rem; color: var(--ink-2); }
@media (prefers-reduced-motion: reduce) {
  .tile { transition: none; }
  .tile:hover { transform: none; }
}

/* notices */
.notice {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  background: var(--warn-bg);
  border-left: 3px solid var(--warn-edge);
  border-radius: 0 8px 8px 0;
  padding: 0.7rem 0.9rem;
  margin-top: 1rem;
  font-size: 0.92rem;
}
.notice p { margin: 0; }
.notice-icon { flex-shrink: 0; }
.notice.tip {
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  border-left-color: var(--accent);
}
.notice.success {
  background: color-mix(in srgb, #0ca30c 10%, transparent);
  border-left-color: #0ca30c;
  margin-bottom: 1.25rem;
}

.export-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  margin-top: 1.25rem;
  padding: 0.75rem 1rem;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease;
}
.export-btn:hover, .export-btn:focus-visible {
  filter: brightness(1.08);
  transform: translateY(-1px);
}
@media (prefers-reduced-motion: reduce) {
  .export-btn { transition: none; }
  .export-btn:hover { transform: none; }
}

/* citations */
sup.cite { font-size: 0.7em; margin-left: 0.05em; }
sup.cite a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  padding: 0 0.1em;
  border-radius: 3px;
  transition: background-color 0.15s ease;
}
sup.cite a:hover, sup.cite a:focus-visible { background: color-mix(in srgb, var(--accent) 18%, transparent); }

/* science section */
.science .sci-title, .refs .sci-title { font-size: 1.3rem; margin: 0 0 0.5rem; letter-spacing: -0.01em; }
.sci-intro { color: var(--ink-2); max-width: 60ch; }
.sci-intro a { color: var(--accent); }

.sci-step {
  display: grid;
  grid-template-columns: 2.25rem 1fr;
  gap: 0.9rem;
  padding: 1.1rem 0;
  border-top: 1px solid var(--hairline);
}
.sci-step:first-of-type { border-top: none; padding-top: 0.5rem; }
.sci-num {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}
.sci-body h3 { margin: 0.15rem 0 0.4rem; font-size: 1.02rem; }
.sci-body p { margin: 0.4rem 0 0; color: var(--ink-2); font-size: 0.93rem; max-width: 62ch; }
.formula {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--page);
  border: 1px solid var(--hairline);
  border-radius: 8px;
  padding: 0.55rem 0.8rem;
  font-size: 0.88rem;
  color: var(--ink) !important;
  display: inline-block;
  overflow-x: auto;
  max-width: 100%;
}
.formula-note { color: var(--muted); font-family: system-ui, sans-serif; font-size: 0.82em; margin-left: 0.4em; }

.open-science {
  margin-top: 1.25rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--hairline);
}
.open-science h3 { margin: 0 0 0.6rem; font-size: 1.02rem; }
.open-science ul { margin: 0; padding-left: 1.1rem; color: var(--ink-2); font-size: 0.93rem; }
.open-science li { margin-bottom: 0.4rem; }
.open-science a { color: var(--accent); }

.ref-list {
  padding-left: 1.4rem;
  color: var(--ink-2);
  font-size: 0.86rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.ref-list li { scroll-margin-top: 1rem; transition: color 0.3s ease; }
.ref-list li:target { color: var(--ink); }
.ref-list a { color: var(--accent); word-break: break-word; }

/* footer */
.foot { color: var(--muted); font-size: 0.82rem; }
.foot a { color: var(--accent); }

@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  .hero-value { font-size: 2.4rem; }
  .card { padding: 1.1rem; }
  .sci-step { grid-template-columns: 1.8rem 1fr; gap: 0.6rem; }
  .sci-num { width: 1.8rem; height: 1.8rem; font-size: 0.85rem; }
}