/* xdiagram website. Tokens follow the app (src/styles.css); dark values apply under the system
   preference unless the visitor picked a theme ([data-theme] on <html>). No external requests. */

:root {
  --font: Inter, "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, "SFMono-Regular", Menlo, monospace;
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --panel: #ffffff;
  --border: #e2e5ea;
  --text: #1f2937;
  --muted: #5b6472;
  --accent: #2f6fde;
  --accent-strong: #245bc0;
  --accent-soft: #e8f0fd;
  --accent-ring: rgba(47, 111, 222, 0.4);
  --amber: #b45309;
  --amber-soft: rgba(217, 119, 6, 0.12);
  --ok: #18794e;
  --dot: #dde1e8;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 12px 32px rgba(16, 24, 40, 0.1);
  --shadow-lg: 0 2px 6px rgba(16, 24, 40, 0.06), 0 30px 70px rgba(16, 24, 40, 0.18);
  --radius: 12px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1218;
    --bg-soft: #141922;
    --panel: #1a1f28;
    --border: #2a313d;
    --text: #e6e9ef;
    --muted: #a0a9b8;
    --accent: #7aa7ff;
    --accent-strong: #9bbcff;
    --accent-soft: rgba(122, 167, 255, 0.14);
    --accent-ring: rgba(122, 167, 255, 0.45);
    --amber: #f0a64a;
    --amber-soft: rgba(240, 166, 74, 0.14);
    --ok: #4cc38a;
    --dot: #232a35;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 2px 6px rgba(0, 0, 0, 0.3), 0 30px 70px rgba(0, 0, 0, 0.5);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0f1218;
  --bg-soft: #141922;
  --panel: #1a1f28;
  --border: #2a313d;
  --text: #e6e9ef;
  --muted: #a0a9b8;
  --accent: #7aa7ff;
  --accent-strong: #9bbcff;
  --accent-soft: rgba(122, 167, 255, 0.14);
  --accent-ring: rgba(122, 167, 255, 0.45);
  --amber: #f0a64a;
  --amber-soft: rgba(240, 166, 74, 0.14);
  --ok: #4cc38a;
  --dot: #232a35;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 2px 6px rgba(0, 0, 0, 0.3), 0 30px 70px rgba(0, 0, 0, 0.5);
  color-scheme: dark;
}

/* ------------------------------------------------------------------ base */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent-strong);
}

code,
kbd {
  font-family: var(--mono);
  font-size: 0.88em;
}

code {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.05em 0.35em;
}

kbd {
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0.05em 0.4em;
  background: var(--panel);
}

:focus-visible {
  outline: 3px solid var(--accent-ring);
  outline-offset: 2px;
  border-radius: 4px;
}

.wrap {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  z-index: 100;
  background: var(--panel);
  padding: 8px 12px;
  border-radius: 8px;
}

.skip:focus {
  left: 8px;
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0;
}

h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  font-weight: 700;
}

h3 {
  font-size: 1.1rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.eyebrow.amber {
  color: var(--amber);
}

.lead {
  font-size: 1.12rem;
  color: var(--muted);
  max-width: 62ch;
}

/* ------------------------------------------------------------------ buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font: 600 0.98rem var(--font);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

:root[data-theme="dark"] .btn.primary {
  color: #0b1220;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .btn.primary {
    color: #0b1220;
  }
}

.btn.primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.btn svg {
  flex: none;
}

/* ------------------------------------------------------------------ header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--text);
  text-decoration: none;
  margin-right: auto;
}

.brand svg {
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.93rem;
  font-weight: 550;
  padding: 7px 10px;
  border-radius: 8px;
}

.nav a:hover,
.nav a[aria-current="true"] {
  color: var(--text);
  background: var(--bg-soft);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
}

.icon-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

[data-theme-toggle] .i-sun,
[data-theme-toggle][data-mode="dark"] .i-moon {
  display: none;
}

[data-theme-toggle][data-mode="dark"] .i-sun {
  display: block;
}

.header-download {
  min-height: 38px;
  padding: 0 14px;
  font-size: 0.9rem;
}

.menu-btn {
  display: none;
}

/* ------------------------------------------------------------------ hero */

.hero {
  position: relative;
  padding: 72px 0 40px;
  text-align: center;
  background:
    radial-gradient(60% 50% at 50% 0%, var(--accent-soft), transparent 70%),
    radial-gradient(circle at 1px 1px, var(--dot) 1px, transparent 1.2px) 0 0 / 22px 22px;
}

.hero h1 {
  font-size: clamp(2.3rem, 6vw, 4.1rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  max-width: 15ch;
  margin: 0 auto 18px;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero .lead {
  margin: 0 auto 30px;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.hero-note {
  margin: 14px 0 0;
  font-size: 0.86rem;
  color: var(--muted);
}

.hero-shot {
  margin: 52px auto 0;
  max-width: 1120px;
}

/* ------------------------------------------------------------------ screenshots */

.shot {
  margin: 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.shot.large {
  box-shadow: var(--shadow-lg);
}

.shot-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
}

.shot-bar i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
}

.shot-bar span {
  margin: 0 auto;
  padding-right: 36px;
  font-size: 0.75rem;
  color: var(--muted);
}

.zoom {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  cursor: zoom-in;
}

.shot figcaption {
  padding: 10px 14px;
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  text-align: left;
}

/* ------------------------------------------------------------------ engines */

.engines {
  padding: 34px 0 10px;
}

.engines .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px 26px;
  color: var(--muted);
  font-size: 0.95rem;
}

.engines strong {
  color: var(--text);
  font-weight: 650;
}

.engine-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.engine-list li {
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-weight: 600;
  font-size: 0.9rem;
}

.engine-list.soft li {
  font-weight: 500;
  color: var(--muted);
}

/* ------------------------------------------------------------------ sections */

section.block {
  padding: 92px 0;
}

section.block.soft {
  background: var(--bg-soft);
  border-block: 1px solid var(--border);
}

.section-head {
  max-width: 760px;
  margin-bottom: 44px;
}

.section-head.center {
  margin-inline: auto;
  text-align: center;
}

.section-head.center .lead {
  margin-inline: auto;
}

.section-head h2 + .lead {
  margin-top: 14px;
}

.feature {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 56px;
  align-items: center;
}

.feature + .feature {
  margin-top: 96px;
}

.feature.flip .feature-text {
  order: 2;
}

.feature-text h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
}

.feature-text .lead {
  margin: 14px 0 18px;
  font-size: 1.05rem;
}

.points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.points li {
  position: relative;
  padding-left: 28px;
  color: var(--text);
}

.points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.42em;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 4px var(--accent-soft), inset 0 0 0 7px var(--accent);
}

.points.amber li::before {
  background: var(--amber-soft);
  box-shadow: inset 0 0 0 4px var(--amber-soft), inset 0 0 0 7px var(--amber);
}

.points li span {
  color: var(--muted);
}

/* X-ray: one wide screenshot, then two columns */
.xray-grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 40px;
  align-items: start;
  margin-top: 44px;
}

.callout {
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: 10px;
  background: var(--panel);
  padding: 16px 18px;
  margin-top: 22px;
  font-size: 0.95rem;
  color: var(--muted);
}

.callout strong {
  color: var(--text);
}

/* Data: three screenshots with tabs */
.tabs {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border-radius: 11px;
  background: var(--panel);
  border: 1px solid var(--border);
  margin-bottom: 18px;
}

.tabs button {
  border: 0;
  background: none;
  color: var(--muted);
  font: 600 0.92rem var(--font);
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
}

.tabs button[aria-selected="true"] {
  background: var(--accent-soft);
  color: var(--accent);
}

.tab-panel[hidden] {
  display: none;
}

.data-points {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  margin-top: 30px;
}

.data-points h3 {
  margin-bottom: 6px;
}

.data-points p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* ------------------------------------------------------------------ privacy */

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 22px;
}

.card svg {
  color: var(--accent);
  margin-bottom: 14px;
}

.card h3 {
  margin-bottom: 8px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

/* ------------------------------------------------------------------ all features */

.all {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 12px 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.all li {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.all strong {
  display: block;
  font-weight: 650;
}

.all span {
  color: var(--muted);
  font-size: 0.92rem;
}

/* ------------------------------------------------------------------ download */

.download-card {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 18px;
  background:
    radial-gradient(80% 120% at 0% 0%, var(--accent-soft), transparent 60%),
    var(--panel);
  padding: 44px;
  box-shadow: var(--shadow);
}

.download-card h2 {
  margin-bottom: 12px;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.requirements {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 0.95rem;
}

.requirements li {
  display: flex;
  gap: 10px;
  color: var(--muted);
}

.requirements li strong {
  color: var(--text);
  min-width: 96px;
  font-weight: 650;
}

/* ------------------------------------------------------------------ FAQ */

.faq {
  max-width: 820px;
  margin: 0 auto;
}

.faq details {
  border-bottom: 1px solid var(--border);
}

.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 36px 20px 0;
  font-weight: 650;
  font-size: 1.05rem;
  position: relative;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--muted);
}

.faq details[open] summary::after {
  content: "–";
}

.faq details p {
  margin: -6px 0 20px;
  color: var(--muted);
}

/* ------------------------------------------------------------------ footer */

.site-footer {
  padding: 40px 0 56px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.site-footer a {
  color: var(--muted);
}

/* ------------------------------------------------------------------ lightbox */

.lightbox {
  width: min(96vw, 1600px);
  max-height: 94vh;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.lightbox::backdrop {
  background: rgba(9, 12, 18, 0.72);
}

.lightbox img {
  width: 100%;
  max-height: calc(94vh - 48px);
  object-fit: contain;
  background: var(--bg-soft);
}

.lightbox-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 48px;
  padding: 0 8px 0 16px;
  font-size: 0.9rem;
  color: var(--muted);
}

.lightbox-bar span {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ------------------------------------------------------------------ responsive */

@media (max-width: 1020px) {
  .cards,
  .data-points {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .nav a {
    padding: 7px 8px;
  }
}

@media (max-width: 880px) {
  .menu-btn {
    display: inline-grid;
  }

  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 10px 16px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 10px 12px;
  }

  .header-download {
    display: none;
  }
}

@media (max-width: 820px) {
  .wrap {
    padding: 0 16px;
  }

  section.block {
    padding: 64px 0;
  }

  .hero {
    padding-top: 48px;
  }

  .hero-shot {
    margin-top: 36px;
  }

  .feature,
  .xray-grid,
  .download-card {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .feature.flip .feature-text {
    order: 0;
  }

  .feature + .feature {
    margin-top: 64px;
  }

  .data-points {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .download-card {
    padding: 26px 20px;
  }

  .shot-bar span {
    display: none;
  }

  .tabs {
    display: flex;
    width: 100%;
  }

  .tabs button {
    flex: 1;
    padding: 8px 6px;
  }
}

@media (max-width: 560px) {
  .cards {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-actions .btn {
    width: 100%;
  }

  .requirements li {
    flex-direction: column;
    gap: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}