/* Ecat site: tokens, reset, typography, shared primitives. */

/* Space Grotesk and JetBrains Mono are licensed under the SIL Open Font License 1.1. */

@font-face {
  font-family: "Space Grotesk";
  src: url("../fonts/space-grotesk-400700.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/jetbrains-mono-400.woff2") format("woff2");
  font-weight: 400 600;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #0a0e13;
  --bg-deep: #080b0f;
  --bg-elev: #0e141b;
  --surface: #121a23;
  --surface-2: #17222d;
  --ink: #f4efe8;
  --muted: #a3aeb9;
  --muted-2: #7c8894;
  --line: rgba(244, 239, 232, 0.09);
  --line-strong: rgba(244, 239, 232, 0.17);
  --orange: #e8743b;
  --orange-soft: #f29a6b;
  --orange-ink: #1b1009;
  --teal: #2f8f8a;
  --teal-soft: #63b7b1;
  --yellow: #ffd166;
  --pink: #f29a9e;
  --radius-card: 18px;
  --radius-code: 12px;
  --radius-pill: 999px;
  --font-sans: "Space Grotesk", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Code", "Liberation Mono",
    monospace;
  --shell: 1200px;
  --header: 64px;
  --z-header: 50;
  --z-float: 40;
  --z-toast: 60;
}

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 320px;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background:
    radial-gradient(900px 520px at 8% -8%, rgba(232, 116, 59, 0.12), transparent 62%),
    radial-gradient(760px 460px at 96% 2%, rgba(47, 143, 138, 0.1), transparent 60%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

img {
  height: auto;
}

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

h1 {
  font-size: clamp(3rem, 7vw, 5.4rem);
  line-height: 0.96;
}

h2 {
  font-size: clamp(2rem, 4.2vw, 3.25rem);
  line-height: 1.04;
}

h3 {
  font-size: clamp(1.08rem, 1.6vw, 1.28rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

p {
  color: var(--muted);
}

strong {
  color: var(--ink);
  font-weight: 600;
}

code,
kbd,
pre {
  font-family: var(--font-mono);
}

code {
  font-size: 0.88em;
}

::selection {
  color: var(--orange-ink);
  background: var(--orange-soft);
}

:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 3px;
}

.shell {
  width: min(100% - 48px, var(--shell));
  margin-inline: auto;
}

.section {
  padding-block: clamp(64px, 9vw, 112px);
}

.section--line {
  border-top: 1px solid var(--line);
}

.section--tint {
  background: rgba(18, 26, 35, 0.42);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  max-width: 740px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.section-head h2 {
  margin-bottom: 16px;
}

.section-head p {
  max-width: 62ch;
  font-size: 1.02rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange-soft);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--orange);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 0.94rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition:
    transform 0.18s ease,
    background-color 0.18s ease,
    border-color 0.18s ease,
    color 0.18s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  color: var(--orange-ink);
  background: var(--orange);
}

.btn-primary:hover {
  background: #f08a55;
}

.btn-ghost {
  color: var(--ink);
  border-color: var(--line-strong);
  background: transparent;
}

.btn-ghost:hover {
  color: var(--orange-soft);
  border-color: rgba(232, 116, 59, 0.6);
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  background: rgba(18, 26, 35, 0.65);
  transition:
    color 0.18s ease,
    border-color 0.18s ease,
    transform 0.18s ease;
}

.icon-btn:hover {
  color: var(--orange-soft);
  border-color: rgba(232, 116, 59, 0.55);
  transform: translateY(-1px);
}

.icon {
  width: 20px;
  height: 20px;
  flex: none;
}

.icon-sm {
  width: 16px;
  height: 16px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--orange-ink);
  background: var(--orange);
  transform: translateY(-160%);
  transition: transform 0.18s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 2px 9px;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  color: var(--muted);
  background: rgba(14, 20, 27, 0.7);
  white-space: nowrap;
}

.chip--accent {
  color: var(--orange-soft);
  border-color: rgba(232, 116, 59, 0.35);
  background: rgba(232, 116, 59, 0.08);
}

.chip--teal {
  color: var(--teal-soft);
  border-color: rgba(47, 143, 138, 0.4);
  background: rgba(47, 143, 138, 0.09);
}

.dot {
  margin: 0 6px;
  color: var(--muted-2);
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 32px, var(--shell));
  }

  .section {
    padding-block: 56px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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