/* ──────────────────────────────────────────────────────────────
   NoteCal · minimal, IBM Plex
   ──────────────────────────────────────────────────────────── */

:root {
  --bg: #FAFAFA;
  --ink: #0B0B0C;
  --ink-2: #5A5A5F;
  --ink-3: #9A9AA0;
  --rule: #ECECEC;
  --rule-strong: #D9D9D9;

  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --max: 1200px;
  --pad: clamp(20px, 4vw, 40px);
  --nav-h: 72px;
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  font-feature-settings: "kern", "ss01";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--ink); color: var(--bg); }

/* ── Layout ─────────────────────────────────────────────────── */

.shell {
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.shell--narrow { max-width: 760px; }

/* ── Header ─────────────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1;
}

.wordmark__icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.nav__links {
  display: flex;
  gap: 28px;
  font-size: 14px;
  font-weight: 400;
  color: var(--ink-2);
}

.nav__links a {
  padding-block: 4px;
  transition: color 160ms ease;
}

.nav__links a:hover { color: var(--ink); }

/* ── Hero ───────────────────────────────────────────────────── */

.hero {
  min-height: calc(100svh - var(--nav-h));
  display: flex;
  align-items: center;
  padding-block: clamp(32px, 5vw, 64px);
}

.hero__inner {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(40px, 6vw, 96px);
  align-items: center;
}

.hero__copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  max-width: 620px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(20px, 2.4vw, 28px);
  padding: 6px 12px;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  background: #FFFFFF;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink);
  position: relative;
  flex-shrink: 0;
}

.hero__badge-dot::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: var(--ink);
  opacity: 0.25;
  animation: hero-badge-pulse 2200ms ease-out infinite;
}

@keyframes hero-badge-pulse {
  0% { transform: scale(0.6); opacity: 0.35; }
  80%, 100% { transform: scale(1.6); opacity: 0; }
}

.hero__title {
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(40px, 6.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  margin: 0;
  max-width: 22ch;
  color: var(--ink);
}

.hero__sub {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  font-size: clamp(15px, 1.4vw, 18px);
  color: var(--ink-2);
  max-width: 38ch;
  line-height: 1.5;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: clamp(24px, 2.8vw, 32px);
  padding: 18px 36px;
  background: var(--ink);
  color: var(--bg);
  font-family: var(--sans);
  font-size: clamp(17px, 1.4vw, 19px);
  font-weight: 600;
  letter-spacing: -0.01em;
  border-radius: 999px;
  transition: transform 160ms ease, background-color 160ms ease, opacity 160ms ease;
}

.hero__cta:hover {
  background: #1f1f23;
  transform: translateY(-1px);
}

.hero__cta:active {
  transform: translateY(0);
  opacity: 0.92;
}

/* ── Carousel (single-phone cross-fade) ────────────────────── */

.hero__device {
  display: flex;
  justify-content: center;
  align-items: center;
}

.device {
  position: relative;
  width: 100%;
  max-width: 360px;
  aspect-ratio: 1419 / 2796;
  margin-inline: auto;
  touch-action: pan-y;
  cursor: grab;
}

.device:active { cursor: grabbing; }

.device__stack {
  position: absolute;
  inset: 0;
}

.slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transform: scale(0.985);
  transition: opacity 700ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 900ms cubic-bezier(0.2, 0.8, 0.2, 1);
  -webkit-user-drag: none;
  user-select: none;
  pointer-events: none;
  will-change: opacity, transform;
}

.slide.is-active {
  opacity: 1;
  transform: scale(1);
  z-index: 1;
}

@media (max-width: 860px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: clamp(40px, 8vw, 64px);
    min-height: 0;
  }
  .hero__copy {
    max-width: none;
    align-items: flex-start;
  }
  .hero__title { max-width: 22ch; }
  .device { max-width: 300px; }
}

/* ── Generic sections ──────────────────────────────────────── */

.section {
  padding-block: clamp(72px, 10vw, 144px);
}

.section__head {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: clamp(40px, 6vw, 72px);
  max-width: 720px;
}

.section__kicker {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.section__title {
  font-family: var(--sans);
  font-weight: 600;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0;
  max-width: 18ch;
}

/* ── Steps ─────────────────────────────────────────────────── */

.steps { display: grid; gap: 0; }

.step {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: clamp(24px, 5vw, 64px);
  align-items: baseline;
  padding-block: clamp(28px, 4vw, 40px);
  border-top: 1px solid var(--rule);
}

.step:last-child { border-bottom: 1px solid var(--rule); }

.step__num {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-2);
}

.step__body h3 {
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--ink);
}

.step__body p {
  margin: 0;
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.55;
  max-width: 50ch;
}

.step__body code {
  font-family: var(--mono);
  font-size: 13px;
  padding: 1px 6px;
  background: color-mix(in srgb, var(--ink) 5%, transparent);
  border-radius: 4px;
  color: var(--ink);
}

@media (max-width: 720px) {
  .step { grid-template-columns: 1fr; gap: 8px; }
}

/* ── Features (two-column type list) ──────────────────────── */

.what { display: grid; gap: 0; }

.what__row {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: clamp(24px, 5vw, 64px);
  align-items: baseline;
  padding-block: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--rule);
}

.what__row:last-child { border-bottom: 1px solid var(--rule); }

.what__label {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.005em;
}

.what__desc {
  margin: 0;
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.55;
  max-width: 50ch;
}

@media (max-width: 720px) {
  .what__row { grid-template-columns: 1fr; gap: 6px; }
}

/* ── Data reliability ──────────────────────────────────────── */

.reliability__grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.1fr);
  gap: clamp(40px, 6vw, 88px);
  align-items: start;
}

.reliability__col {
  display: flex;
  flex-direction: column;
}

.reliability__head {
  margin-bottom: clamp(32px, 4.5vw, 56px);
}

.reliability__head .section__kicker {
  display: block;
  margin-bottom: 16px;
}

.reliability__title {
  max-width: 18ch;
}

.reliability__pillars {
  display: grid;
  gap: 0;
}

.pillar {
  padding-block: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--rule);
}

.pillar:first-child {
  border-top: 0;
  padding-top: 0;
}

.pillar:last-child {
  padding-bottom: 0;
}

.pillar__label {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 12px;
}

.pillar__desc {
  margin: 0;
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.6;
  max-width: 46ch;
}

.pillar__desc strong {
  color: var(--ink);
  font-weight: 500;
}

/* Trace screenshot: actual NutritionReasoningPopup mockup */

.trace-shot {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.trace-shot img {
  width: 100%;
  max-width: 360px;
  height: auto;
  display: block;
  -webkit-user-drag: none;
  user-select: none;
}

/* Legacy trace card styles — retained for fallback only */

.trace {
  background: #FFFFFF;
  border: 1px solid var(--rule);
  padding: clamp(22px, 2.6vw, 32px);
  font-family: var(--sans);
  position: sticky;
  top: calc(var(--nav-h) + 24px);
}

.trace__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--rule);
}

.trace__tag {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
}

.trace__id {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

.trace__section {
  padding-block: 16px;
  border-top: 1px solid var(--rule);
}

.trace__section:first-of-type {
  border-top: 0;
}

.trace__label {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 10px;
}

.trace__input {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--ink);
  letter-spacing: -0.005em;
  line-height: 1.4;
}

.trace__copy {
  margin: 0;
  font-size: 14px;
  color: var(--ink);
  line-height: 1.55;
  max-width: 56ch;
}

.trace__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.trace__list li {
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 1.5;
  padding-left: 18px;
  position: relative;
}

.trace__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 10px;
  height: 1px;
  background: var(--ink-3);
}

.trace__macros {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.chip {
  background: #FFFFFF;
  padding: 14px 12px;
  text-align: left;
}

.chip__num {
  display: block;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: -0.025em;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.chip__u {
  display: block;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.trace__sources {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.trace__sources li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding-block: 9px;
  border-bottom: 1px solid var(--rule);
}

.trace__sources li:first-child { padding-top: 0; }
.trace__sources li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.src__name {
  font-size: 13.5px;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.005em;
  border-bottom: 1px solid var(--rule-strong);
  padding-bottom: 1px;
  transition: border-color 160ms ease;
}

.src__name:hover { border-color: var(--ink); }

.src__id {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}

.trace__foot {
  margin-top: 4px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  display: flex;
  align-items: center;
  gap: 14px;
}

.conf__label {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
  flex: 1;
}

.conf__bar {
  display: inline-flex;
  gap: 3px;
}

.conf__tick {
  width: 14px;
  height: 6px;
  background: var(--rule-strong);
  border-radius: 1px;
}

.conf__tick.is-on {
  background: var(--ink);
}

.conf__num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  letter-spacing: -0.005em;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 860px) {
  .reliability__grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .trace,
  .trace-shot {
    position: static;
  }
  .trace-shot img {
    max-width: 300px;
  }
}

@media (max-width: 480px) {
  .trace__macros { grid-template-columns: repeat(2, 1fr); }
}

/* ── Footer ────────────────────────────────────────────────── */

.foot { }

.foot__inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
  padding-block: 32px 40px;
}

.foot__copy {
  font-size: 13px;
  color: var(--ink-3);
  flex: 1;
  text-align: left;
}

.foot__attribution {
  font-size: 13px;
  color: var(--ink-3);
  flex: 1;
  text-align: center;
}

.foot__attribution a { color: inherit; }
.foot__attribution a:hover { color: var(--ink); }

.foot__links {
  display: flex;
  gap: 24px;
  font-size: 13px;
  color: var(--ink-3);
  flex: 1;
  justify-content: flex-end;
}

.foot__links a:hover { color: var(--ink); }

/* ── Legal pages ───────────────────────────────────────────── */

.legal {
  padding-block: clamp(40px, 6vw, 72px) clamp(72px, 10vw, 128px);
}

.legal__title {
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(40px, 5.6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 12px;
}

.legal__meta {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 48px;
}

.legal h2 {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
  margin: 56px 0 16px;
}

.legal p, .legal li {
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  margin: 0 0 14px;
}

.legal ul {
  margin: 0 0 14px;
  padding-left: 18px;
}

.legal ul li { margin-bottom: 6px; }

.legal a {
  color: var(--ink);
  border-bottom: 1px solid var(--rule-strong);
  transition: border-color 180ms ease;
}
.legal a:hover { border-color: var(--ink); }

.legal strong { font-weight: 600; }

.legal__callout {
  border-left: 1px solid var(--ink);
  padding: 4px 0 4px 24px;
  margin: 28px 0;
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink-2);
}

.legal__callout strong { color: var(--ink); }

/* ── Reduced motion ─────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}