:root {
  color-scheme: dark;
  --bg: #0f1110;
  --bg-elevated: #171a18;
  --surface: #1d211e;
  --surface-strong: #262b27;
  --surface-soft: rgba(255, 248, 235, 0.06);
  --text: #f6efdf;
  --text-muted: #cbbda2;
  --text-faint: #9d9078;
  --line: rgba(255, 239, 210, 0.14);
  --accent: #c57f31;
  --accent-strong: #ecb15f;
  --accent-soft: rgba(197, 127, 49, 0.16);
  --accent-cool: #87c7bb;
  --shadow: 0 32px 80px rgba(0, 0, 0, 0.28);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --nav-height: 84px;
  --container-wide: 1240px;
  --container: 1120px;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f2ebde;
  --bg-elevated: #f8f1e5;
  --surface: rgba(255, 252, 246, 0.92);
  --surface-strong: #fffaf0;
  --surface-soft: rgba(82, 56, 26, 0.05);
  --text: #201810;
  --text-muted: #5d4a34;
  --text-faint: #7c694f;
  --line: rgba(73, 47, 21, 0.12);
  --accent: #9e5d12;
  --accent-strong: #bb741c;
  --accent-soft: rgba(158, 93, 18, 0.14);
  --accent-cool: #0f7160;
  --shadow: 0 32px 80px rgba(56, 37, 12, 0.12);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
  background:
    radial-gradient(circle at 10% 15%, rgba(197, 127, 49, 0.15), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(135, 199, 187, 0.12), transparent 24%),
    linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg) 46%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.3;
}

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

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

code,
pre,
input,
select,
textarea,
.chip,
.brand-mark,
.eyebrow,
.section-label,
.frame-label,
.stat-label,
.code-title,
.step-number,
.footer-copy {
  font-family: "IBM Plex Mono", monospace;
}

code {
  padding: 0.12rem 0.38rem;
  border-radius: 0.45rem;
  background: var(--surface-soft);
  color: var(--accent-strong);
  font-size: 0.95em;
}

pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--surface-strong);
  color: var(--text);
  padding: 0.75rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  z-index: 30;
}

.skip-link:focus {
  top: 1rem;
}

.container-wide,
.container {
  width: min(100% - 2rem, var(--container-wide));
  margin: 0 auto;
}

.container {
  width: min(100% - 2rem, var(--container));
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(15, 17, 16, 0.72);
  border-bottom: 1px solid var(--line);
}

html[data-theme="light"] .site-nav {
  background: rgba(242, 235, 222, 0.82);
}

.nav-inner {
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.2rem;
  height: 3.2rem;
  border-radius: 1rem;
  background:
    linear-gradient(135deg, rgba(236, 177, 95, 0.22), rgba(135, 199, 187, 0.18)),
    var(--surface);
  border: 1px solid rgba(236, 177, 95, 0.26);
  color: var(--accent-strong);
  font-size: 0.95rem;
}

.brand-text {
  font-size: 1rem;
}

.nav-links,
.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.96rem;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
}

.theme-toggle,
.btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 999px;
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.theme-toggle {
  padding: 0.72rem 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
}

.theme-toggle:hover,
.theme-toggle:focus-visible,
.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(236, 177, 95, 0.4);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.18);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 1.3rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: #21160c;
  border-color: transparent;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  color: #17110b;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.02);
}

.btn-block {
  width: 100%;
}

.hero {
  padding: 4rem 0 3.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
  gap: 2rem;
  align-items: stretch;
}

.hero-copy,
.hero-panel,
.card,
.play-card,
.step-card,
.faq-item {
  position: relative;
}

.hero-copy,
.hero-panel,
.card,
.play-card,
.step-card,
.code-card,
.faq-item {
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 30%),
    var(--surface);
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 3rem;
  overflow: hidden;
}

.hero-copy::before {
  content: "";
  position: absolute;
  inset: auto auto -5rem -5rem;
  width: 14rem;
  height: 14rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(197, 127, 49, 0.22), transparent 70%);
  pointer-events: none;
}

.eyebrow,
.section-label,
.frame-label,
.card-kicker,
.code-title {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--accent-strong);
}

.eyebrow {
  margin-bottom: 1rem;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1;
}

h1,
h2 {
  font-family: "Fraunces", serif;
  letter-spacing: -0.04em;
}

h1 {
  font-size: clamp(3.6rem, 7vw, 6.7rem);
  max-width: 10ch;
}

h2 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  max-width: 12ch;
}

h3 {
  font-size: 1.3rem;
  line-height: 1.15;
}

.hero-lead,
.hero-sub,
.section-intro,
.card-copy,
.faq-item p,
.step-card p,
.calculator-note,
.footer-copy {
  color: var(--text-muted);
}

.hero-lead {
  margin: 1.4rem 0 0;
  font-size: 1.17rem;
  max-width: 54ch;
}

.hero-sub {
  margin: 1rem 0 0;
  max-width: 58ch;
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2.2rem;
}

.stat {
  padding: 1rem 1rem 1.1rem;
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  border: 1px solid rgba(236, 177, 95, 0.12);
}

.stat-value {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1;
}

.stat-label {
  margin-top: 0.55rem;
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.hero-panel {
  padding: 1.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.signal-frame {
  width: 100%;
  padding: 1.6rem;
  border-radius: calc(var(--radius-xl) - 10px);
  background:
    linear-gradient(180deg, rgba(236, 177, 95, 0.08), rgba(0, 0, 0, 0) 26%),
    rgba(10, 11, 11, 0.62);
  border: 1px solid rgba(236, 177, 95, 0.14);
}

html[data-theme="light"] .signal-frame {
  background:
    linear-gradient(180deg, rgba(158, 93, 18, 0.08), rgba(255, 255, 255, 0.1) 30%),
    rgba(255, 253, 248, 0.76);
}

.frame-label {
  margin-bottom: 0.8rem;
}

.frame-label + .signal-block {
  margin-bottom: 1.1rem;
}

.signal-block,
.code-block,
.output {
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text);
  line-height: 1.7;
}

html[data-theme="light"] .signal-block,
html[data-theme="light"] .code-block,
html[data-theme="light"] .output {
  background: rgba(32, 24, 16, 0.04);
  border-color: rgba(32, 24, 16, 0.08);
}

.signal-block-dense {
  color: var(--text-faint);
}

.token-bar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.token-old,
.token-new {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.token-old span,
.token-new span {
  display: block;
  color: var(--text-faint);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.token-old strong,
.token-new strong {
  display: block;
  margin-top: 0.35rem;
  font-size: 1.3rem;
}

.token-new {
  border-color: rgba(236, 177, 95, 0.24);
}

.section {
  padding: 1.5rem 0 3.5rem;
}

.section-surface {
  position: relative;
}

.section-surface::before {
  content: "";
  position: absolute;
  inset: 6rem 0 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 60%);
  pointer-events: none;
}

.section-label {
  margin-bottom: 1rem;
}

.section-intro {
  max-width: 72ch;
  margin: 1.2rem 0 0;
  font-size: 1.04rem;
}

.problem-grid,
.protocol-grid,
.release-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.card,
.play-card,
.step-card,
.code-card,
.faq-item {
  padding: 1.5rem;
}

.card-plain {
  background:
    linear-gradient(180deg, rgba(135, 199, 187, 0.05), transparent 28%),
    var(--surface);
}

.card-accent {
  background:
    linear-gradient(180deg, rgba(236, 177, 95, 0.12), transparent 28%),
    var(--surface);
}

.card-kicker {
  margin-bottom: 0.8rem;
}

.bullet-list {
  margin: 1rem 0 0;
  padding-left: 1rem;
  color: var(--text-muted);
}

.bullet-list li + li {
  margin-top: 0.6rem;
}

.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
}

.chip {
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  border: 1px solid rgba(236, 177, 95, 0.2);
  background: rgba(236, 177, 95, 0.08);
  font-size: 0.82rem;
  color: var(--text);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.step-card {
  min-height: 100%;
}

.step-number {
  display: inline-flex;
  font-size: 0.82rem;
  margin-bottom: 1rem;
  color: var(--accent-cool);
  letter-spacing: 0.1em;
}

.code-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  margin-top: 1.25rem;
}

.inline-links a,
.artifact-links a,
.footer-links a {
  color: var(--accent-strong);
}

.inline-links a:hover,
.artifact-links a:hover,
.footer-links a:hover {
  text-decoration: underline;
}

.playground-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.play-card {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 24%),
    var(--surface);
}

.play-card-wide {
  grid-column: 1 / -1;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 1rem;
}

.field-grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field-stack {
  display: block;
  margin-top: 1rem;
}

label span {
  display: inline-block;
  margin-bottom: 0.45rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 0.95rem 1rem;
  font-size: 0.96rem;
  transition:
    border-color 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease;
}

html[data-theme="light"] input,
html[data-theme="light"] select,
html[data-theme="light"] textarea {
  background: rgba(32, 24, 16, 0.04);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: rgba(236, 177, 95, 0.55);
  box-shadow: 0 0 0 4px rgba(236, 177, 95, 0.16);
}

textarea {
  resize: vertical;
}

.output {
  margin-top: 1rem;
  min-height: 5.5rem;
}

.output strong {
  color: var(--accent-strong);
}

.output-error {
  color: #f0b5aa;
}

.calculator-note {
  margin: 1rem 0 1.1rem;
}

.calculator-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 1rem;
}

.calc-card {
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(236, 177, 95, 0.12);
  background: var(--surface-soft);
}

.calc-card span {
  display: block;
  color: var(--text-faint);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.calc-card strong {
  display: block;
  margin-top: 0.45rem;
  font-size: 1.4rem;
}

.artifact-links,
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 1rem;
}

.faq {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.site-footer {
  padding: 1.4rem 0 2.6rem;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.footer-brand {
  font-family: "Fraunces", serif;
  font-size: 1.4rem;
  letter-spacing: -0.03em;
}

.footer-copy {
  margin: 0.55rem 0 0;
}

@media (max-width: 1100px) {
  .nav-links {
    display: none;
  }

  .hero-grid,
  .problem-grid,
  .protocol-grid,
  .release-grid,
  .steps-grid,
  .code-pair,
  .playground-grid,
  .faq,
  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats,
  .field-grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  :root {
    --nav-height: auto;
  }

  body::before {
    background-size: 28px 28px;
  }

  .site-nav {
    position: static;
  }

  .nav-inner,
  .nav-actions {
    flex-wrap: wrap;
  }

  .nav-inner {
    padding: 1rem 0;
  }

  .hero {
    padding-top: 2rem;
  }

  .hero-copy,
  .hero-panel,
  .card,
  .play-card,
  .step-card,
  .code-card,
  .faq-item {
    padding: 1.2rem;
  }

  h1 {
    font-size: clamp(2.9rem, 12vw, 4.4rem);
  }

  h2 {
    font-size: clamp(2rem, 9vw, 3.1rem);
  }

  .hero-stats,
  .field-grid,
  .field-grid-3,
  .token-bar {
    grid-template-columns: 1fr;
  }

  .hero-actions,
  .inline-links {
    flex-direction: column;
    align-items: stretch;
  }

  .footer-grid {
    flex-direction: column;
  }

  .btn,
  .theme-toggle {
    width: 100%;
  }
}