:root {
  --ink: #0a1622;
  --ink-2: #152536;
  --paper: #f4f0e8;
  --paper-deep: #e7e0d2;
  --teal: #0d7377;
  --teal-2: #14919b;
  --amber: #b87333;
  --line: rgba(10, 22, 34, 0.11);
  --muted: rgba(10, 22, 34, 0.64);
  --white: #fff;
  --shadow: 0 22px 55px rgba(10, 22, 34, 0.14);
  --radius: 20px;
  --nav-h: 64px;
  --font-display: "Newsreader", Georgia, serif;
  --font-body: "Manrope", system-ui, sans-serif;
  --max: 1140px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1000px 520px at 8% -8%, rgba(13, 115, 119, 0.16), transparent 55%),
    radial-gradient(800px 420px at 100% 5%, rgba(184, 115, 51, 0.13), transparent 48%),
    linear-gradient(180deg, #f8f4ec 0%, var(--paper) 45%, #ebe4d6 100%);
  line-height: 1.58;
  overflow-x: hidden;
}

body::before {
  content: "";
  pointer-events: none;
  position: fixed;
  inset: 0;
  opacity: 0.035;
  z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

body > * {
  position: relative;
  z-index: 1;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(var(--max), calc(100% - 2.4rem));
  margin-inline: auto;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--nav-h);
  backdrop-filter: blur(16px) saturate(1.2);
  background: rgba(244, 240, 232, 0.86);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.18rem;
  letter-spacing: -0.02em;
}

.brand span {
  color: var(--teal);
}

.nav-links {
  display: flex;
  gap: 1.15rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
}

.nav-links a {
  position: relative;
  padding: 0.2rem 0;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--teal);
  transition: width 0.25s ease;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--ink);
}

.nav-links a:hover::after,
.nav-links a.is-active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.65);
  border-radius: 10px;
  width: 2.4rem;
  height: 2.4rem;
  cursor: pointer;
}

/* Hero */
.hero {
  padding: 3.8rem 0 2.8rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: 2.6rem;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal);
  font-weight: 800;
  margin-bottom: 0.95rem;
}

.eyebrow::before {
  content: "";
  width: 1.5rem;
  height: 2px;
  background: linear-gradient(90deg, var(--teal), var(--amber));
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.55rem, 5.2vw, 4rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin: 0 0 1rem;
  font-weight: 600;
}

.hero h1 em {
  font-style: italic;
  background: linear-gradient(120deg, var(--teal), #1aa7a1 55%, var(--amber));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  font-size: 1.06rem;
  color: var(--muted);
  max-width: 35rem;
  margin: 0 0 1.45rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: 1.35rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.78rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 0.93rem;
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--ink), var(--ink-2));
  color: var(--paper);
  box-shadow: 0 12px 28px rgba(10, 22, 34, 0.24);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.45);
  border-color: var(--line);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.78);
}

.btn-on-dark {
  border-color: rgba(255, 255, 255, 0.28) !important;
  color: #f4f0e8 !important;
  background: rgba(255, 255, 255, 0.06) !important;
}

.meta-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.pill {
  font-size: 0.76rem;
  padding: 0.34rem 0.72rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid var(--line);
  color: var(--muted);
  font-weight: 600;
}

.hero-visual {
  position: relative;
}

.hero-frame {
  border-radius: 22px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.65);
  background: #fff;
  animation: floatY 8s ease-in-out infinite;
}

.hero-frame img {
  width: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  object-position: center top;
}

.hero-badge {
  position: absolute;
  right: 0.8rem;
  bottom: 1rem;
  background: rgba(10, 22, 34, 0.92);
  color: var(--paper);
  padding: 0.9rem 1.05rem;
  border-radius: 16px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  max-width: 11.8rem;
  animation: fadeUp 0.85s ease both 0.25s;
}

.hero-badge strong {
  display: block;
  font-size: 1.4rem;
  font-family: var(--font-display);
  line-height: 1;
  margin-bottom: 0.28rem;
}

.hero-badge span {
  font-size: 0.74rem;
  opacity: 0.78;
}

@keyframes floatY {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* Protocol ribbon */
.protocol-ribbon {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
  margin-top: 2rem;
}

.protocol-step {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.95rem 1rem;
  position: relative;
}

.protocol-step .step-id {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 800;
  color: var(--teal);
}

.protocol-step h3 {
  margin: 0.3rem 0 0.25rem;
  font-size: 1rem;
  font-family: var(--font-display);
}

.protocol-step p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.protocol-step.best {
  border-color: rgba(13, 115, 119, 0.35);
  background: linear-gradient(160deg, rgba(20, 145, 155, 0.12), rgba(255, 255, 255, 0.7));
}

/* Stats */
.stats {
  padding: 0.2rem 0 2.6rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
}

.stat-card {
  background: rgba(255, 255, 255, 0.66);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.15rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.stat-card .num {
  font-family: var(--font-display);
  font-size: 2.05rem;
  letter-spacing: -0.03em;
  color: var(--teal);
  line-height: 1.1;
}

.stat-card .label {
  margin-top: 0.35rem;
  font-size: 0.86rem;
  color: var(--muted);
  font-weight: 600;
}

section {
  padding: 3rem 0;
}

.section-head {
  max-width: 42rem;
  margin-bottom: 1.7rem;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  letter-spacing: -0.025em;
  margin: 0 0 0.5rem;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.75s ease, transform 0.75s ease;
}

.reveal.in {
  opacity: 1;
  transform: none;
}

.reveal.d1 {
  transition-delay: 0.08s;
}
.reveal.d2 {
  transition-delay: 0.16s;
}
.reveal.d3 {
  transition-delay: 0.24s;
}
.reveal.d4 {
  transition-delay: 0.32s;
}

.dim-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.7rem;
}

.dim-card {
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.48));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1rem 1.25rem;
  min-height: 11rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.dim-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.dim-card::after {
  content: "";
  position: absolute;
  inset: auto -18% -38% auto;
  width: 7rem;
  height: 7rem;
  border-radius: 50%;
  background: rgba(13, 115, 119, 0.09);
}

.dim-code {
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--teal);
}

.dim-card h3 {
  margin: 0.45rem 0 0.4rem;
  font-size: 1.02rem;
  font-family: var(--font-display);
}

.dim-card p {
  margin: 0;
  font-size: 0.84rem;
  color: var(--muted);
  position: relative;
  z-index: 1;
}

.figure-block {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 1.55rem;
  align-items: center;
  margin: 1.35rem 0 2.3rem;
}

.figure-block.reverse {
  grid-template-columns: 0.82fr 1.18fr;
}

.figure-block.reverse .fig-copy {
  order: 2;
}

.figure-block.reverse .fig-media {
  order: 1;
}

.fig-media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
  transition: transform 0.35s ease;
}

.fig-media:hover {
  transform: scale(1.012);
}

.fig-media img {
  width: 100%;
  cursor: zoom-in;
  background: #f0ebe2;
  min-height: 140px;
}

.fig-cap {
  margin: 0.55rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 600;
}

.fig-copy h3 {
  font-family: var(--font-display);
  font-size: 1.48rem;
  margin: 0 0 0.55rem;
}

.fig-copy p {
  margin: 0 0 0.75rem;
  color: var(--muted);
}

.fig-copy ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--ink-2);
}

.fig-copy li {
  margin: 0.28rem 0;
}

.img-broken {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 160px;
  padding: 1rem;
  color: #8a4b2a;
  background: #f7e8dc;
  font-size: 0.88rem;
  text-align: center;
}

.results {
  background:
    radial-gradient(600px 280px at 90% 0%, rgba(20, 145, 155, 0.35), transparent 60%),
    linear-gradient(145deg, #0a1622, #143041 55%, #0f2a2c);
  color: var(--paper);
  border-radius: 28px;
  padding: 2.3rem;
  box-shadow: var(--shadow);
}

.results-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
  align-items: center;
}

.results h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  margin: 0 0 0.7rem;
}

.results p {
  margin: 0 0 1rem;
  color: rgba(244, 240, 232, 0.78);
}

.result-metrics {
  display: grid;
  gap: 0.7rem;
}

.metric {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  padding: 0.95rem 1rem;
}

.metric .v {
  font-family: var(--font-display);
  font-size: 1.85rem;
  color: #5eead4;
}

.metric .k {
  font-size: 0.82rem;
  opacity: 0.75;
}

.cite-box {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.3rem;
  position: relative;
}

.cite-box pre {
  margin: 0;
  padding-right: 4.5rem;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--ink-2);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.copy-btn {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 0.38rem 0.8rem;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
}

.copy-btn.ok {
  background: var(--teal);
  color: #fff;
  border-color: transparent;
}

.footer {
  padding: 2.4rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(6, 12, 18, 0.86);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 120;
}

.lightbox.open {
  display: flex;
}

.lightbox img {
  max-height: 90vh;
  max-width: min(1100px, 94vw);
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  border: 0;
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 1.25rem;
}

@media (max-width: 980px) {
  .hero-grid,
  .figure-block,
  .figure-block.reverse,
  .results-inner,
  .protocol-ribbon {
    grid-template-columns: 1fr;
  }

  .figure-block.reverse .fig-copy,
  .figure-block.reverse .fig-media {
    order: initial;
  }

  .dim-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-frame {
    animation: none;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(244, 240, 232, 0.97);
    border-bottom: 1px solid var(--line);
    padding: 0.6rem 1.2rem 1rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--line);
  }

  .dim-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }
}