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

:root {
  --bg:           #FFFFFF;
  --fg:           #000000;
  --line:         #000000;
  --hover:        #F5F5F5;
  --glass-bg:     rgba(255, 255, 255, 0.65);
  --backdrop-bg:  rgba(255, 255, 255, 0.4);

  --nav-w:        280px;
  --header-h:     56px;
  --pad-x:        clamp(24px, 4vw, 72px);
  --pad-y:        clamp(32px, 5vw, 80px);
  --content-max:  760px;

  --glass-blur:   saturate(180%) blur(16px);

  --t-fast:       140ms ease;
  --t-med:        240ms cubic-bezier(.2,.7,.2,1);
}

[data-theme="dark"] {
  --bg:           #000000;
  --fg:           #FFFFFF;
  --line:         #FFFFFF;
  --hover:        #111111;
  --glass-bg:     rgba(0, 0, 0, 0.65);
  --backdrop-bg:  rgba(0, 0, 0, 0.4);
}

html { color-scheme: light dark; scroll-behavior: smooth; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body { min-height: 100vh; min-height: 100dvh; }
a { color: inherit; text-decoration: none; }

*::-webkit-scrollbar { display: none; width: 0; height: 0; }
* { scrollbar-width: none; -ms-overflow-style: none; }

/* ========== LAYOUT ========== */
.app {
  display: grid;
  grid-template-columns: 1fr var(--nav-w);
  min-height: 100vh;
  min-height: 100dvh;
  transition: grid-template-columns var(--t-med);
}
.app.sidebar-collapsed { grid-template-columns: 1fr 0; }
.app.sidebar-collapsed .sidebar {
  width: 0; min-width: 0; overflow: hidden;
  border-left: none;
  transform: translateX(100%);
  pointer-events: none;
}

.open-floating {
  position: absolute;
  top: 20px; right: 24px;
  z-index: 25;
  appearance: none;
  background: transparent;
  border: none;
  padding: 6px;
  cursor: pointer;
  color: var(--fg);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-med);
}
.open-floating svg { display: block; }
body:has(.app.sidebar-collapsed) .open-floating { opacity: 0.7; pointer-events: auto; }
body:has(.app.sidebar-collapsed) .open-floating:hover { opacity: 1; }

/* ========== SIDEBAR ========== */
.sidebar {
  position: sticky; top: 0;
  align-self: start;
  height: 100vh; height: 100dvh;
  border-left: 1px solid var(--line);
  transition: transform var(--t-med);
  grid-column: 2; grid-row: 1; order: 2;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  display: flex; flex-direction: column;
  z-index: 20;
}

.sidebar__brand {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  min-height: var(--header-h);
}

.brand__close {
  appearance: none; background: transparent; border: none;
  width: 32px; height: 32px;
  display: grid; place-items: center;
  cursor: pointer; padding: 0;
  flex-shrink: 0; margin-left: auto;
  color: var(--fg); opacity: 0.7;
  transition: opacity var(--t-fast);
}
.brand__close:hover { opacity: 1; }
.brand__close svg { display: block; }

.brand__logo { width: 32px; height: 32px; flex-shrink: 0; display: block; object-fit: cover; }

.brand__link {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none; color: inherit;
  -webkit-user-select: none; user-select: none;
}

.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__name { font-size: 14px; font-weight: 600; letter-spacing: -0.01em; line-height: 1.2; white-space: nowrap; }
.brand__sub  { font-size: 11px; font-weight: 400; letter-spacing: 0.04em; text-transform: uppercase; line-height: 1.2; margin-top: 2px; }

.sidebar__scroll { flex: 1; overflow-y: auto; padding: 20px 0; }
.nav { padding: 0 16px; }

.nav-item {
  display: block;
  padding: 8px 12px;
  font-size: 13.5px; font-weight: 400; line-height: 1.45;
  color: var(--fg); opacity: 0.65;
  transition: opacity var(--t-fast);
  cursor: pointer;
}
.nav-item:hover { opacity: 1; }
.nav-item.is-active { opacity: 1; font-weight: 600; }

.nav-divider {
  height: 1px;
  background: var(--line);
  opacity: 0.2;
  margin: 12px 12px;
}

.sidebar__footer {
  border-top: 1px solid var(--line);
  padding: 14px 16px;
  font-size: 12px;
  display: flex; flex-direction: column; gap: 10px;
}
.license-btn {
  display: inline-flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: var(--bg);
  font-size: 12px; font-weight: 500; color: var(--fg);
  cursor: pointer;
  transition: background var(--t-fast);
}
.license-btn:hover { background: var(--hover); }
.license-btn svg { display: block; flex-shrink: 0; }

/* ========== MOBILE HEADER ========== */
.header-mobile {
  display: none;
  position: sticky; top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--line);
  align-items: center; justify-content: space-between;
  padding: 0 16px;
  z-index: 30;
}
.header-mobile__brand { display: flex; align-items: center; gap: 10px; }
.header-mobile__brand .brand__name { font-size: 13px; }

.menu-btn {
  appearance: none; background: transparent; border: none;
  width: 36px; height: 36px;
  display: grid; place-items: center;
  cursor: pointer; padding: 0;
  color: var(--fg); opacity: 0.7;
  transition: opacity var(--t-fast);
}
.menu-btn:hover { opacity: 1; }
.menu-btn svg { display: block; }

.theme-toggle {
  position: absolute; top: 20px; left: 24px;
  z-index: 25;
  appearance: none; background: transparent; border: none;
  padding: 6px; cursor: pointer;
  color: var(--fg); opacity: 0.7;
  transition: opacity var(--t-fast), transform var(--t-fast);
}
.theme-toggle:hover { opacity: 1; transform: rotate(15deg); }
.theme-toggle svg { display: block; }
.theme-toggle .sun  { display: none; }
.theme-toggle .moon { display: block; }
[data-theme="dark"] .theme-toggle .sun  { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }

@media (max-width: 900px) {
  #themeToggle { display: none; }
  #themeToggleMobile { position: static; padding: 6px; }
}
@media (min-width: 901px) {
  #themeToggleMobile { display: none; }
}

/* ========== CONTENT ========== */
.content { padding: var(--pad-y) var(--pad-x); max-width: 100%; position: relative; }
.content__inner { max-width: var(--content-max); margin: 0 auto; }

/* ===== TYPOGRAPHY ===== */
h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0 0 20px;
}
h2 {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 64px 0 18px;
}
h2:first-child { margin-top: 0; }
h3 {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 32px 0 10px;
}
p { margin: 0 0 16px; max-width: 68ch; text-wrap: pretty; }
.lede { font-size: 17px; line-height: 1.55; margin-bottom: 28px; opacity: 0.9; }

code { font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 0.9em; }
p code, li code { border: 1px solid var(--line); padding: 1px 6px; font-size: 0.85em; }

.section { padding-top: 8px; }
.section + .section { padding-top: 0; }
.section__eyebrow {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-bottom: 10px;
}

/* ===== HERO (intro page) ===== */
.page-hero { overflow: hidden; }
.page-hero .content { padding: 0 var(--pad-x); height: calc(100vh - 0px); height: calc(100dvh - 0px); }
.page-hero .content__inner {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  padding-bottom: 10vh;
}
.hero h1 {
  font-size: clamp(40px, 6.2vw, 68px);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin: 0 0 24px;
}
.hero h1 em {
  font-style: normal;
  font-weight: 400;
  opacity: 0.55;
  display: block;
}
.hero__lede {
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.5;
  max-width: 54ch;
  margin: 0 0 40px;
  opacity: 0.75;
}
.hero__cta {
  display: flex;
  gap: 0;
}
.hero__cta a {
  padding: 14px 24px;
  border: 1px solid var(--line);
  font-size: 13.5px;
  font-weight: 500;
  transition: background var(--t-fast);
}
.hero__cta a + a { border-left: none; }
.hero__cta a:hover { background: var(--hover); }
.hero__cta a.cta-primary {
  background: var(--fg);
  color: var(--bg);
}
.hero__cta a.cta-primary:hover {
  opacity: 0.85;
}

@media (max-width: 900px) {
  .page-hero .content { height: calc(100vh - var(--header-h)); height: calc(100dvh - var(--header-h)); }
  .page-hero .content__inner { padding-bottom: 6vh; }
  .hero__cta { flex-direction: column; }
  .hero__cta a + a { border-left: 1px solid var(--line); border-top: none; }
}

/* ===== PAGE INTRO (sub-pages) ===== */
.page-intro {
  min-height: 70vh;
  min-height: 70dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 56px;
}
.page-intro h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
}
.page-intro h1 em {
  font-style: normal;
  font-weight: 400;
  opacity: 0.5;
  display: block;
}
.page-intro p {
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.55;
  max-width: 56ch;
  opacity: 0.8;
  margin: 0;
}
.page-intro .scroll-hint {
  margin-top: 40px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.35;
  display: flex;
  align-items: center;
  gap: 6px;
}
.page-intro .scroll-hint svg { display: block; }
@media (max-width: 900px) {
  .page-intro { min-height: 60vh; min-height: 60dvh; padding-bottom: 32px; margin-bottom: 40px; }
}

/* ===== MECHANISM CARDS ===== */
.mechanisms { margin: 24px 0 32px; border: 1px solid var(--line); }
.mechanism { display: grid; grid-template-columns: 64px 1fr; border-bottom: 1px solid var(--line); }
.mechanism:last-child { border-bottom: none; }
.mechanism__num {
  padding: 20px;
  border-right: 1px solid var(--line);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 13px; font-weight: 500; letter-spacing: 0.04em;
}
.mechanism__body { padding: 20px; }
.mechanism__title { font-size: 15px; font-weight: 600; margin-bottom: 6px; line-height: 1.3; }
.mechanism__desc { font-size: 13.5px; line-height: 1.55; margin: 0; max-width: none; }

/* ===== FIGURE / VIZ ===== */
figure.viz {
  margin: 32px 0;
  border: 1px solid var(--line);
  overflow: hidden;
}
figure.viz svg {
  display: block;
  width: 100%;
  height: auto;
  stroke: var(--fg);
  color: var(--fg);
}
figure.viz figcaption {
  border-top: 1px solid var(--line);
  padding: 12px 16px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.65;
}
.viz svg text {
  font-family: 'Inter', -apple-system, system-ui, sans-serif;
  fill: var(--fg);
  stroke: none;
}
.viz svg .mono { font-family: 'JetBrains Mono', ui-monospace, monospace; }
.viz svg .muted { opacity: 0.55; }
.viz svg .fill-fg { fill: var(--fg); stroke: none; }
.viz svg .fill-bg { fill: var(--bg); }

/* ===== TWO COLUMN GRID ===== */
.twocol {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  margin: 24px 0 32px;
}
.twocol > div {
  padding: 20px;
  border-right: 1px solid var(--line);
}
.twocol > div:last-child { border-right: none; }
.twocol h3 { margin-top: 0; }
.twocol p { font-size: 13.5px; margin-bottom: 0; }
@media (max-width: 700px) {
  .twocol { grid-template-columns: 1fr; }
  .twocol > div { border-right: none; border-bottom: 1px solid var(--line); }
  .twocol > div:last-child { border-bottom: none; }
}

/* ===== BENEFITS LIST ===== */
.benefits { margin: 20px 0 32px; border: 1px solid var(--line); }
.benefit {
  display: grid;
  grid-template-columns: 44px 1fr;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
  gap: 16px;
  align-items: start;
}
.benefit:last-child { border-bottom: none; }
.benefit__icon {
  width: 28px; height: 28px;
  border: 1px solid var(--line);
  display: grid; place-items: center;
}
.benefit__icon svg { display: block; }
.benefit__title { font-size: 14.5px; font-weight: 600; margin-bottom: 4px; line-height: 1.3; }
.benefit__desc { font-size: 13.5px; line-height: 1.55; margin: 0; opacity: 0.85; max-width: none; }

/* ===== CALLOUT ===== */
.callout {
  margin: 32px 0;
  padding: 24px 28px;
  border-left: 2px solid var(--fg);
  background: var(--hover);
}
.callout p { margin: 0; font-size: 16px; line-height: 1.55; max-width: none; }
.callout p + p { margin-top: 10px; font-size: 13px; opacity: 0.7; font-family: 'JetBrains Mono', ui-monospace, monospace; letter-spacing: 0.04em; text-transform: uppercase; }

/* ===== CODE BLOCK ===== */
.code-toggle-wrap { margin: 24px 0 32px; }
.code-toggle-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  background: var(--bg);
  font-size: 13px; font-weight: 500; color: var(--fg);
  cursor: pointer;
  transition: background var(--t-fast);
  font-family: inherit;
}
.code-toggle-btn:hover { background: var(--hover); }
.code-toggle-btn svg { display: block; }
.code-block {
  display: none;
  margin-top: -1px;
  border: 1px solid var(--line);
  overflow-x: auto;
  position: relative;
}
.code-block.is-open { display: block; }
.code-block pre {
  margin: 0;
  padding: 20px;
  padding-top: 44px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12.5px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--fg);
}
.code-block .code-comment { opacity: 0.45; }
.code-copy {
  position: absolute;
  top: 8px; right: 8px;
  appearance: none;
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 5px 10px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg);
  cursor: pointer;
  transition: background var(--t-fast);
  z-index: 2;
}
.code-copy:hover { background: var(--hover); }

/* ===== CTA LINK ===== */
.cta-link {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px;
  border: 1px solid var(--line);
  font-size: 13.5px; font-weight: 500;
  transition: background var(--t-fast);
  margin: 8px 0 32px;
}
.cta-link:hover { background: var(--hover); }
.cta-link svg { display: block; }

/* ===== FAQ ===== */
.faq-list { margin: 24px 0 32px; border: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item:last-child { border-bottom: none; }
.faq-q {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 20px;
  cursor: pointer;
  font-size: 14.5px; font-weight: 600;
  line-height: 1.4;
  transition: background var(--t-fast);
  background: none; border: none; width: 100%; text-align: left;
  color: var(--fg);
  font-family: inherit;
}
.faq-q:hover { background: var(--hover); }
.faq-q svg {
  flex-shrink: 0;
  transition: transform var(--t-fast);
  stroke: var(--fg);
}
.faq-item.is-open .faq-q svg { transform: rotate(45deg); }
.faq-a {
  display: none;
  padding: 0 20px 18px;
  font-size: 13.5px;
  line-height: 1.6;
}
.faq-a p { margin: 0 0 8px; max-width: none; }
.faq-a p:last-child { margin-bottom: 0; }
.faq-item.is-open .faq-a { display: block; }

/* ===== CONTACT ===== */
.contact-box {
  border: 1px solid var(--line);
  padding: 28px;
  margin: 24px 0 32px;
}
.contact-box p { margin: 0 0 12px; }
.contact-box p:last-child { margin: 0; }
.contact-email {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 14px;
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ===== LEGAL ===== */
.legal-content h3 { margin-top: 40px; }
.legal-content h3:first-child { margin-top: 0; }
.legal-content p { font-size: 13.5px; line-height: 1.6; }
.legal-content ul {
  margin: 0 0 16px;
  padding-left: 20px;
}
.legal-content li {
  font-size: 13.5px;
  line-height: 1.6;
  margin-bottom: 4px;
}

/* ===== COOKIE BANNER ===== */
.cookie-banner {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--bg);
  border-top: 1px solid var(--line);
  padding: 18px 24px;
}
.cookie-banner.is-visible { display: block; }
.cookie-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.cookie-text {
  font-size: 13px;
  line-height: 1.5;
  flex: 1 1 300px;
  opacity: 0.85;
}
.cookie-text a { text-decoration: underline; text-underline-offset: 2px; }
.cookie-buttons {
  display: flex;
  gap: 0;
  flex-shrink: 0;
}
.cookie-btn {
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: var(--bg);
  font-size: 12px;
  font-weight: 500;
  color: var(--fg);
  cursor: pointer;
  transition: background var(--t-fast);
  font-family: inherit;
}
.cookie-btn + .cookie-btn { border-left: none; }
.cookie-btn:hover { background: var(--hover); }
.cookie-btn--accept {
  background: var(--fg);
  color: var(--bg);
}
.cookie-btn--accept:hover { opacity: 0.85; background: var(--fg); }

@media (max-width: 600px) {
  .cookie-banner { padding: 12px 16px; }
  .cookie-text { font-size: 12px; }
  .cookie-inner { gap: 10px; }
  .cookie-buttons { width: 100%; }
  .cookie-btn { flex: 1; text-align: center; font-size: 11px; padding: 8px 8px; }
}

/* ===== DRAWER ===== */
.drawer-backdrop {
  display: none;
  position: fixed; inset: 0;
  background: var(--backdrop-bg);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 40;
  opacity: 0;
  transition: opacity var(--t-med);
}
.drawer-backdrop.is-open { display: block; opacity: 1; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .header-mobile { display: flex; }
  .sidebar {
    position: fixed; top: 0; left: 0; right: 0; bottom: auto;
    width: 100%; height: auto;
    max-height: 100vh; max-height: 100dvh;
    transform: translateY(-100%);
    transition: transform var(--t-med);
    z-index: 50;
    border-left: none; border-right: none;
    border-bottom: 1px solid var(--line);
  }
  .sidebar.is-open { transform: translateY(0); }
  .content { padding: 28px 20px 64px; }
  .mechanism { grid-template-columns: 56px 1fr; }
  .mechanism__num, .mechanism__body { padding: 16px; }
  h2 { margin-top: 48px; }
}
@media (max-width: 1100px) and (min-width: 901px) {
  :root { --nav-w: 240px; }
}