/* ============================================================
   How Claude Marks AI-Generated Content — interactive explainer
   Editorial system: warm paper, clay accents, Fraunces + Inter
   ============================================================ */

/* ---------- Fonts (local, variable) ---------- */
@font-face {
  font-family: 'Fraunces';
  src: url('../assets/fonts/fraunces-normal.woff2') format('woff2');
  font-weight: 300 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Fraunces';
  src: url('../assets/fonts/fraunces-italic.woff2') format('woff2');
  font-weight: 300 900;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../assets/fonts/inter-normal.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../assets/fonts/inter-italic.woff2') format('woff2');
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}

/* ---------- Tokens ---------- */
:root {
  --paper:      #F4EEE4;
  --paper-deep: #ECE4D6;
  --cream:      #FBF8F1;
  --ink:        #211A12;
  --ink-soft:   #4E4535;
  --muted:      #7A6F5C;
  --clay:       #C15F3C;
  --clay-deep:  #96421F;
  --clay-soft:  #E8C9B8;
  --sun:        #DFA05C;
  --dark:       #1C1510;
  --dark-2:     #251C14;
  --dark-text:  #EDE4D3;
  --dark-muted: #B3A693;
  --line:       rgba(33, 26, 18, 0.14);
  --line-soft:  rgba(33, 26, 18, 0.08);
  --serif: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --sans:  'Inter', -apple-system, 'Segoe UI', sans-serif;
  --mono:  ui-monospace, 'SF Mono', Menlo, monospace;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --header-h: 72px;
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background-color: var(--paper);
  /* paper grain */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='0 0 0 0 0.13 0 0 0 0 0.10 0 0 0 0 0.07 0 0 0 0.035 0'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--clay-deep); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--clay); }
code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: rgba(33, 26, 18, 0.06);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
::selection { background: var(--clay); color: var(--cream); }

:focus-visible {
  outline: 2.5px solid var(--clay);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 200;
  background: var(--ink);
  color: var(--cream);
  padding: 0.6rem 1.1rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: top 0.2s var(--ease-out);
}
.skip-link:focus { top: 12px; color: var(--cream); }

/* ---------- Progress bar ---------- */
.progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 120;
  background: transparent;
  pointer-events: none;
}
.progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--clay), var(--sun));
  transform-origin: 0 50%;
  transform: scaleX(0);
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 110;
  background: rgba(244, 238, 228, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.site-header.is-scrolled {
  border-bottom-color: var(--line-soft);
  box-shadow: 0 6px 30px -18px rgba(33, 26, 18, 0.35);
}
.site-header__inner {
  max-width: 1240px;
  margin: 0 auto;
  height: var(--header-h);
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--ink);
}
.brand__mark { width: 30px; height: 30px; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: 0.01em;
}
.brand__sub {
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-weight: 600;
}
.site-nav { display: flex; gap: clamp(0.9rem, 2.2vw, 1.8rem); }
.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.86rem;
  font-weight: 550;
  letter-spacing: 0.01em;
  padding: 0.35rem 0;
  position: relative;
}
.site-nav a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--clay);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.25s var(--ease-out);
}
.site-nav a:hover::after,
.site-nav a.is-active::after { transform: scaleX(1); }
.site-nav a.is-active { color: var(--clay-deep); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + clamp(2rem, 6vh, 5rem)) clamp(1.25rem, 5vw, 3rem) clamp(3rem, 7vh, 5rem);
  position: relative;
  overflow: hidden;
}
.hero::before {
  /* faint watermark rings, decorative */
  content: '';
  position: absolute;
  right: -12vmin;
  top: -14vmin;
  width: 58vmin;
  height: 58vmin;
  border-radius: 50%;
  background:
    repeating-radial-gradient(circle at 50% 50%,
      rgba(193, 95, 60, 0.07) 0 2px,
      transparent 2px 26px);
  pointer-events: none;
}
.hero__inner { max-width: 1080px; margin: 0 auto; width: 100%; }

.eyebrow {
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--clay-deep);
  margin: 0 0 1.6rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}
.eyebrow::before {
  content: '';
  width: 2.4rem;
  height: 1.5px;
  background: var(--clay);
  display: inline-block;
  flex: none;
}
.hero__title {
  font-family: var(--serif);
  font-weight: 480;
  font-size: clamp(2.9rem, 7.6vw, 6.6rem);
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin: 0 0 1.8rem;
  max-width: 14ch;
  text-wrap: balance;
}
.hero__title em {
  font-style: italic;
  font-weight: 400;
  color: var(--clay-deep);
}
.hero__lede {
  font-size: clamp(1.1rem, 1.7vw, 1.32rem);
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0 0 2.6rem;
}
.hero__lede strong { color: var(--ink); }

/* hero watermark sample */
.hero__sample {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.4rem 0 1.5rem;
  margin: 0 0 2.6rem;
  max-width: 700px;
}
.hero__sample-label {
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 650;
  color: var(--muted);
  margin: 0 0 0.55rem;
}
.hero__sample-text {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.4vw, 1.7rem);
  line-height: 1.4;
  font-weight: 420;
  margin: 0;
  cursor: default;
}
.hero__sample-text .wm-token { position: relative; transition: color 0.35s var(--ease-out); }
.hero__sample:hover .wm-token,
.hero__sample:focus-within .wm-token {
  color: var(--clay-deep);
  background: linear-gradient(transparent 62%, rgba(193, 95, 60, 0.25) 62%);
}
.hero__sample-hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0.6rem 0 0;
  font-style: italic;
}
.hero__sample:hover .hero__sample-hint { opacity: 0; }

.hero__meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 3vw, 2.5rem);
  margin: 0 0 3rem;
  max-width: 860px;
}
.hero__meta-item { margin: 0; }
.hero__meta-item dt {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2.3vw, 1.8rem);
  font-weight: 550;
  color: var(--clay-deep);
  margin-bottom: 0.25rem;
}
.hero__meta-item dd {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.5;
}

.scroll-cue {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--muted);
}
.scroll-cue__text {
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.scroll-cue__line {
  width: 1.5px;
  height: 3.2rem;
  background: var(--clay);
  transform-origin: 50% 0;
  animation: cue 2.2s var(--ease-out) infinite;
}
@keyframes cue {
  0%   { transform: scaleY(0); }
  45%  { transform: scaleY(1); transform-origin: 50% 0; }
  46%  { transform-origin: 50% 100%; }
  90%, 100% { transform: scaleY(0); transform-origin: 50% 100%; }
}

/* ---------- Sections ---------- */
.section {
  padding: clamp(4.5rem, 10vw, 9rem) clamp(1.25rem, 5vw, 3rem);
  scroll-margin-top: var(--header-h);
}
.section--tinted { background: var(--paper-deep); }
.section__grid {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 5.5rem);
}
.section__rail { position: relative; }
.section__number {
  font-family: var(--serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--clay);
  margin: 0 0 0.4rem;
  letter-spacing: 0.08em;
}
.section__label {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 2.6vw, 2.3rem);
  font-weight: 520;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0;
  position: sticky;
  top: calc(var(--header-h) + 2rem);
  max-width: 12ch;
}
.section__intro {
  font-size: clamp(1.15rem, 1.9vw, 1.45rem);
  line-height: 1.55;
  font-weight: 420;
  color: var(--ink);
  max-width: 56ch;
  margin: 0.35rem 0 clamp(2.5rem, 5vw, 4rem);
  text-wrap: pretty;
}
.section__intro em { font-family: var(--serif); }
.section__outro {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 60ch;
  margin: 2.5rem 0 0;
}

/* ---------- Timeline ---------- */
.timeline { margin: 0 0 clamp(3rem, 6vw, 4.5rem); }
.timeline__track {
  height: 3px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 1.8rem;
}
.timeline__fill {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--clay), var(--sun));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.15s linear;
}
.timeline__nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.2rem, 3vw, 2.5rem);
}
.timeline__node { position: relative; padding-top: 0.4rem; }
.timeline__node::before {
  content: '';
  position: absolute;
  top: -2.05rem;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2.5px solid var(--clay);
}
.timeline__when {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.5rem;
}
.timeline__node--key .timeline__when {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.4vw, 2.1rem);
  font-weight: 600;
  letter-spacing: 0;
  text-transform: none;
  color: var(--clay-deep);
}
.timeline__what { margin: 0; font-size: 0.95rem; color: var(--ink-soft); }
.timeline__what strong { color: var(--ink); }
.timeline__counter {
  display: inline-block;
  margin: 0.9rem 0 0;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--clay);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--clay-deep);
  background: rgba(193, 95, 60, 0.08);
}

/* ---------- Commitments ---------- */
.commitments {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.commitment {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 1.2rem;
  padding: 1.8rem 0;
  border-bottom: 1px solid var(--line);
}
.commitment__index {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.6rem;
  color: var(--clay);
  margin: 0;
  line-height: 1.2;
}
.commitment__title {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  font-weight: 550;
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}
.commitment p:last-child { margin: 0; color: var(--ink-soft); max-width: 62ch; }

/* ---------- Coverage ---------- */
.coverage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1rem, 2.4vw, 1.6rem);
}
.coverage__card {
  background: var(--cream);
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  padding: clamp(1.4rem, 2.6vw, 2rem);
  box-shadow: 0 18px 40px -30px rgba(33, 26, 18, 0.4);
  transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}
.coverage__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 28px 50px -30px rgba(33, 26, 18, 0.5);
}
.coverage__card h3 {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 570;
  margin: 0 0 0.8rem;
}
.coverage__card p { margin: 0.8rem 0 0; color: var(--ink-soft); font-size: 0.95rem; }
.chip-list {
  list-style: none;
  margin: 0.4rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}
.chip-list li {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--clay-deep);
  background: rgba(193, 95, 60, 0.1);
  border: 1px solid rgba(193, 95, 60, 0.3);
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
}

/* ---------- Demos ---------- */
.demo {
  margin: 0 0 clamp(3.5rem, 7vw, 6rem);
  scroll-margin-top: calc(var(--header-h) + 1rem);
}
.demo:last-child { margin-bottom: 0; }
.demo__kicker {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--clay);
  margin: 0 0 0.5rem;
}
.demo__title {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 3.4vw, 2.8rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  margin: 0 0 1rem;
}
.demo__copy { max-width: 62ch; color: var(--ink-soft); margin: 0 0 2.2rem; }
.demo__copy strong, .demo__copy code { color: var(--ink); }
.demo__note {
  font-size: 0.82rem;
  color: var(--muted);
  font-style: italic;
  margin: 1.4rem 0 0;
  max-width: 62ch;
}

/* — watermark lab — */
.wm-lab {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(1.4rem, 3vw, 2.4rem);
  align-items: start;
}
.wm-card {
  background: var(--cream);
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 24px 55px -35px rgba(33, 26, 18, 0.45);
  position: relative;
}
.wm-card__chrome {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.85rem 1.2rem;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-soft);
}
.wm-card__chrome img { width: 18px; height: 18px; }
.wm-card__status {
  margin-left: auto;
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.3s;
}
.wm-card.is-revealed .wm-card__status { color: var(--clay-deep); }
.wm-card__text {
  font-family: var(--serif);
  font-size: clamp(1.12rem, 1.9vw, 1.38rem);
  line-height: 1.62;
  font-weight: 430;
  padding: clamp(1.2rem, 2.6vw, 2rem);
  margin: 0;
}
.wm-card__text .wm-token {
  position: relative;
  transition: background 0.4s var(--ease-out), color 0.4s var(--ease-out);
  border-radius: 2px;
}
.wm-card.is-revealed .wm-token {
  background: linear-gradient(transparent 58%, rgba(193, 95, 60, 0.3) 58%);
  color: var(--clay-deep);
}
.wm-card__signal {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s var(--ease-out);
  border-top: 1px dashed transparent;
}
.wm-card.is-revealed .wm-card__signal {
  max-height: 5rem;
  border-top-color: rgba(193, 95, 60, 0.35);
}
.wm-card__signal code {
  display: block;
  background: rgba(193, 95, 60, 0.07);
  color: var(--clay-deep);
  font-size: 0.74rem;
  padding: 0.7rem 1.2rem;
  border-radius: 0;
  letter-spacing: 0.02em;
}

.wm-controls { display: grid; gap: 1.3rem; }
.btn {
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  padding: 0.8rem 1.5rem;
  border-radius: 999px;
  border: 1.5px solid var(--ink);
  background: var(--ink);
  color: var(--cream);
  cursor: pointer;
  transition: transform 0.25s var(--ease-out), background 0.25s, color 0.25s, border-color 0.25s;
  justify-self: start;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: var(--clay-deep); border-color: var(--clay-deep); }
.btn--primary:hover { background: var(--clay); border-color: var(--clay); }
.btn--primary[aria-pressed="true"] { background: var(--cream); color: var(--clay-deep); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--ink); }
.btn--ghost[aria-pressed="true"] {
  background: rgba(150, 66, 31, 0.1);
  border-color: var(--clay-deep);
  color: var(--clay-deep);
}
.btn--dark { background: var(--dark); border-color: var(--dark); color: var(--dark-text); text-decoration: none; display: inline-block; }
.btn--dark:hover { background: var(--clay-deep); border-color: var(--clay-deep); color: var(--cream); }

.wm-edit__label { margin: 0 0 0.55rem; font-size: 0.85rem; font-weight: 600; color: var(--ink-soft); }
.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  background: rgba(33, 26, 18, 0.05);
  border: 1px solid var(--line-soft);
  padding: 0.3rem;
  border-radius: 999px;
}
.segmented__btn {
  border: 0;
  background: transparent;
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-soft);
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.25s, color 0.25s;
}
.segmented__btn:hover { color: var(--ink); }
.segmented__btn.is-active { background: var(--ink); color: var(--cream); }

.wm-meter { display: grid; gap: 0.45rem; }
.wm-meter__label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
}
.wm-meter__track {
  height: 6px;
  border-radius: 3px;
  background: rgba(33, 26, 18, 0.1);
  overflow: hidden;
}
.wm-meter__fill {
  display: block;
  height: 100%;
  width: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--clay-deep), var(--sun));
  transform-origin: 0 50%;
  transform: scaleX(1);
  transition: transform 0.6s var(--ease-out), background 0.4s;
}
.wm-meter__fill[data-level="mid"] { transform: scaleX(0.62); }
.wm-meter__fill[data-level="none"] { transform: scaleX(0.04); background: var(--muted); }
.wm-verdict {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
  border-left: 3px solid var(--clay);
  padding-left: 1rem;
  min-height: 3.4em;
  transition: opacity 0.3s;
}
.wm-verdict.is-fading { opacity: 0; }

/* — provenance lab — */
.prov-lab {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: clamp(1.4rem, 3vw, 2.4rem);
  align-items: start;
}
.prov-file {
  background: var(--cream);
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 24px 55px -35px rgba(33, 26, 18, 0.45);
}
.prov-tabs {
  display: flex;
  gap: 0.3rem;
  padding: 0.8rem 1rem 0;
}
.prov-tab {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 600;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  padding: 0.45rem 0.9rem;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}
.prov-tab:hover { color: var(--ink); }
.prov-tab.is-active {
  color: var(--clay-deep);
  background: rgba(193, 95, 60, 0.09);
  border-color: rgba(193, 95, 60, 0.3);
  border-bottom-color: transparent;
}
.prov-preview {
  position: relative;
  margin: 0.8rem 1rem 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  aspect-ratio: 1;
  background: var(--paper-deep);
}
.prov-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: filter 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}
.prov-file.is-tampered .prov-preview img {
  filter: hue-rotate(130deg) saturate(1.4) contrast(1.05);
  transform: scale(1.03);
}
.prov-tamper-glitch {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  background:
    repeating-linear-gradient(0deg, rgba(150, 30, 30, 0.16) 0 3px, transparent 3px 9px);
  mix-blend-mode: multiply;
  transition: opacity 0.4s;
}
.prov-file.is-tampered .prov-tamper-glitch { opacity: 1; }
.prov-filename {
  margin: 0;
  padding: 0.9rem 1.1rem 0;
  font-size: 0.9rem;
}
.prov-filesize { color: var(--muted); font-size: 0.8rem; }
.prov-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  padding: 1rem 1.1rem 1.2rem;
}

.prov-manifest {
  background: var(--dark-2);
  color: var(--dark-text);
  border-radius: 16px;
  padding: clamp(1.3rem, 2.6vw, 1.9rem);
  box-shadow: 0 24px 55px -35px rgba(28, 21, 16, 0.9);
  border: 1px solid rgba(237, 228, 211, 0.1);
}
.prov-manifest__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.2rem;
  padding-bottom: 1rem;
  border-bottom: 1px dashed rgba(237, 228, 211, 0.2);
}
.prov-manifest__title {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 550;
  margin: 0;
}
.seal {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  transition: background 0.3s, color 0.3s;
}
.seal[data-state="valid"] { background: rgba(126, 171, 120, 0.18); color: #A9D0A0; }
.seal[data-state="invalid"] { background: rgba(196, 74, 55, 0.22); color: #F0A495; }
.prov-manifest__rows { margin: 0; display: grid; gap: 0.75rem; }
.prov-manifest__rows > div {
  display: grid;
  grid-template-columns: 9.5rem minmax(0, 1fr);
  gap: 0.8rem;
  font-size: 0.88rem;
}
.prov-manifest__rows dt {
  color: var(--dark-muted);
  font-weight: 600;
  letter-spacing: 0.04em;
  font-size: 0.76rem;
  text-transform: uppercase;
  padding-top: 0.15em;
}
.prov-manifest__rows dd { margin: 0; }
.prov-manifest__rows code {
  background: rgba(237, 228, 211, 0.1);
  color: var(--sun);
}
.prov-manifest__rows dd.is-struck { text-decoration: line-through; color: var(--dark-muted); }
.prov-manifest__verdict {
  margin: 1.3rem 0 0;
  padding-top: 1.1rem;
  border-top: 1px dashed rgba(237, 228, 211, 0.2);
  font-size: 0.92rem;
  color: var(--dark-muted);
}
.prov-manifest__verdict strong { color: var(--dark-text); }

/* ---------- Detection ---------- */
.detect {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1rem, 2.4vw, 1.6rem);
}
.detect__card {
  background: var(--cream);
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  padding: clamp(1.4rem, 2.6vw, 2rem);
  display: grid;
  gap: 0.3rem;
  box-shadow: 0 18px 40px -30px rgba(33, 26, 18, 0.4);
}
.detect__type {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 570;
  margin: 0;
}
.detect__arrow { margin: 0; color: var(--clay); font-size: 1.3rem; }
.detect__check { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }

/* ---------- Limitations (dark) ---------- */
.section--dark {
  background: var(--dark);
  color: var(--dark-text);
  position: relative;
}
.section--dark::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.03 0'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
  pointer-events: none;
}
.section--dark .section__grid { position: relative; }
.section--dark .section__number { color: var(--sun); }
.section--dark .section__label { color: var(--dark-text); }
.section__intro--dark { color: var(--dark-text); }
.limits__headline {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 460;
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin: 0 0 clamp(2.5rem, 5vw, 4rem);
  max-width: 18ch;
}
.limits__headline em { font-style: italic; color: var(--sun); }
.limits {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 5vw, 4.5rem);
}
.limits__col-title {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 540;
  margin: 0 0 0.9rem;
}
.limits__found { color: #A9D0A0; font-style: italic; }
.limits__missing { color: #F0A495; font-style: italic; }
.limits__col-lede {
  color: var(--dark-muted);
  font-size: 0.98rem;
  margin: 0 0 1.6rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid rgba(237, 228, 211, 0.14);
  max-width: 46ch;
}
.limits__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.15rem;
  counter-reset: limit;
}
.limits__list li {
  position: relative;
  padding-left: 2.1rem;
  color: var(--dark-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}
.limits__list li::before {
  counter-increment: limit;
  content: counter(limit, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.12em;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1rem;
  color: var(--sun);
}
.limits__list strong { color: var(--dark-text); display: block; font-weight: 620; }
.limits__col:first-child .limits__list strong { display: inline; }

/* ---------- Builders ---------- */
.section--builders {
  background: var(--paper);
  text-align: center;
}
.builders__inner { max-width: 760px; margin: 0 auto; }
.builders__title {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 480;
  letter-spacing: -0.02em;
  margin: 0.4rem 0 1.6rem;
}
.builders__copy {
  font-size: clamp(1.05rem, 1.7vw, 1.25rem);
  line-height: 1.65;
  color: var(--ink-soft);
  margin: 0 0 2.4rem;
  text-wrap: pretty;
}
.builders__cta { margin: 0; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-deep);
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1.25rem, 5vw, 3rem);
}
.site-footer__inner {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  gap: 1rem;
  justify-items: start;
}
.site-footer__logo { width: 144px; height: auto; opacity: 0.85; }
.site-footer__note {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-soft);
  max-width: 68ch;
}
.site-footer__fine {
  margin: 0;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

/* ---------- Reveal animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.in-view { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }

/* ---------- Responsive ---------- */
@media (max-width: 1020px) {
  .section__grid { grid-template-columns: 1fr; gap: 1.8rem; }
  .section__label { position: static; max-width: none; }
  .wm-lab, .prov-lab { grid-template-columns: 1fr; }
  .wm-controls { max-width: 560px; }
}
@media (max-width: 760px) {
  .site-nav { display: none; }
  .hero__meta { grid-template-columns: 1fr; gap: 1.2rem; }
  .timeline__nodes { grid-template-columns: 1fr; gap: 1.6rem; }
  .timeline__node { padding-left: 1.6rem; padding-top: 0; }
  .timeline__node::before { top: 0.35rem; left: 0; }
  .timeline__track { display: none; }
  .coverage, .detect, .limits { grid-template-columns: 1fr; }
  .commitment { grid-template-columns: 2.4rem minmax(0, 1fr); }
  .segmented { border-radius: 18px; }
  .segmented__btn { flex: 1 1 auto; }
  .hero { min-height: 0; padding-top: calc(var(--header-h) + 3rem); }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }
  .reveal { opacity: 1; transform: none; }
  .scroll-cue__line { animation: none; }
}