/* ============================================================
   EIDevTools — shared design system
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Geist:wght@300;400;500;600;700&family=Geist+Mono:wght@400;500;600&display=swap');

:root {
  /* Dark theme tokens */
  --bg: #0b0b0d;
  --bg-elev-1: #121215;
  --bg-elev-2: #18181c;
  --bg-elev-3: #1f1f24;

  --fg: #ededef;
  --fg-2: #b8b8bd;
  --fg-3: #7a7a82;
  --fg-4: #4a4a52;

  --border: #25252b;
  --border-2: #2e2e35;
  --border-strong: #3a3a42;

  --accent: oklch(0.72 0.18 295);
  --accent-hover: oklch(0.78 0.18 295);
  --accent-soft: oklch(0.72 0.18 295 / 0.14);
  --accent-faint: oklch(0.72 0.18 295 / 0.06);
  --accent-fg: #0b0b0d;

  --ok: oklch(0.74 0.15 155);
  --warn: oklch(0.78 0.14 75);
  --err:  oklch(0.68 0.20 25);

  --font-sans: 'Geist', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, 'JetBrains Mono', SFMono-Regular, Menlo, monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --maxw: 1180px;
  --pad: 32px;

  --shadow-1: 0 1px 0 0 rgba(255,255,255,0.04) inset, 0 8px 24px -8px rgba(0,0,0,0.5);
  --shadow-window: 0 30px 80px -20px rgba(0,0,0,0.7), 0 0 0 1px rgba(255,255,255,0.04);
}

html[data-theme="light"] {
  --bg: #fafafa;
  --bg-elev-1: #f3f3f3;
  --bg-elev-2: #ffffff;
  --bg-elev-3: #ebebee;

  --fg: #0d0d10;
  --fg-2: #44444a;
  --fg-3: #76767e;
  --fg-4: #a5a5ad;

  --border: #e3e3e6;
  --border-2: #d6d6da;
  --border-strong: #c0c0c6;

  --accent: oklch(0.55 0.18 295);
  --accent-hover: oklch(0.50 0.18 295);
  --accent-soft: oklch(0.55 0.18 295 / 0.10);
  --accent-faint: oklch(0.55 0.18 295 / 0.05);
  --accent-fg: #ffffff;

  --shadow-1: 0 1px 0 0 rgba(0,0,0,0.02) inset, 0 8px 24px -8px rgba(0,0,0,0.10);
  --shadow-window: 0 30px 80px -20px rgba(0,0,0,0.18), 0 0 0 1px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 20% -10%, oklch(0.72 0.18 295 / 0.08), transparent 50%),
    radial-gradient(circle at 80% 0%, oklch(0.72 0.18 295 / 0.04), transparent 40%);
}

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

a.link, p a, li a {
  color: var(--fg);
  border-bottom: 1px solid var(--border-strong);
  transition: border-color 120ms, color 120ms;
}
a.link:hover, p a:hover, li a:hover {
  border-bottom-color: var(--accent);
  color: var(--accent-hover);
}

p { color: var(--fg-2); }

::selection { background: var(--accent-soft); color: var(--fg); }

/* ---------- Layout ---------- */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

@media (max-width: 720px) {
  :root { --pad: 20px; }
}

/* ---------- Typographic primitives ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-3);
}
.eyebrow .dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 8px;
  vertical-align: 1px;
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--fg);
  line-height: 1.1;
  margin: 0;
  text-wrap: balance;
}
h1 { font-size: clamp(40px, 5.6vw, 64px); letter-spacing: -0.03em; }
h2 { font-size: clamp(28px, 3.2vw, 38px); }
h3 { font-size: 20px; letter-spacing: -0.01em; }
h4 { font-size: 15px; }

.lede {
  font-size: 18px;
  color: var(--fg-2);
  max-width: 56ch;
  text-wrap: pretty;
}

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

/* ---------- Hotkey chips ---------- */
.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  padding: 0 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  background: var(--bg-elev-2);
  border: 1px solid var(--border-2);
  border-bottom-width: 2px;
  border-radius: 6px;
  color: var(--fg);
  white-space: nowrap;
  line-height: 1;
}
.kbd.lg {
  min-width: 36px;
  height: 36px;
  font-size: 14px;
  padding: 0 11px;
}
.kbd-group {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 44px;
  padding: 0 18px;
  border-radius: 10px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  border: 1px solid var(--border-2);
  background: var(--bg-elev-2);
  color: var(--fg);
  cursor: pointer;
  transition: background 120ms, border-color 120ms, transform 80ms;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { background: var(--bg-elev-3); border-color: var(--border-strong); }
.btn:active { transform: translateY(1px); }
.btn .meta { color: var(--fg-3); font-family: var(--font-mono); font-size: 12px; }

.btn.primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.primary .meta { color: color-mix(in oklab, var(--accent-fg), transparent 35%); }

.btn.ghost { background: transparent; }
.btn.ghost:hover { background: var(--bg-elev-2); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--bg), transparent 20%);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.site-header .row {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.brand .logo {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), oklch(0.55 0.18 280));
  display: grid;
  place-items: center;
  color: white;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
}
.nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
  align-items: center;
}
.nav a {
  padding: 8px 12px;
  font-size: 14px;
  color: var(--fg-2);
  border-radius: 8px;
  white-space: nowrap;
  transition: background 120ms, color 120ms;
}
.nav a:hover { color: var(--fg); background: var(--bg-elev-2); }
.nav a.current { color: var(--fg); }
.nav-tools {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 8px;
  padding-left: 12px;
  border-left: 1px solid var(--border);
}

.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--border-2);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-elev-1);
}
.lang-toggle button {
  appearance: none;
  background: transparent;
  border: 0;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--fg-3);
  cursor: pointer;
  letter-spacing: 0.05em;
}
.lang-toggle button.active { background: var(--bg-elev-3); color: var(--fg); }
.lang-toggle button:hover { color: var(--fg); }

.icon-btn {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: transparent;
  border: 1px solid var(--border-2);
  color: var(--fg-2);
  cursor: pointer;
}
.icon-btn:hover { background: var(--bg-elev-2); color: var(--fg); }

/* ---------- Section ---------- */
section { padding: 80px 0; border-top: 1px solid var(--border); }
section.hero { border-top: 0; padding: 64px 0 80px; }
.section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 40px;
}
.section-head h2 { max-width: 24ch; }
.section-head p { max-width: 60ch; }

/* ---------- Cards ---------- */
.card {
  background: var(--bg-elev-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
}

/* ---------- App-style window ---------- */
.app-window {
  background: var(--bg-elev-1);
  border: 1px solid var(--border-2);
  border-radius: 12px;
  box-shadow: var(--shadow-window);
  overflow: hidden;
}
.app-titlebar {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 36px;
  padding: 0 12px;
  background: var(--bg-elev-2);
  border-bottom: 1px solid var(--border);
}
.traffic {
  display: inline-flex;
  gap: 6px;
}
.traffic span {
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--bg-elev-3);
  border: 1px solid var(--border-2);
}
.traffic span:nth-child(1) { background: #ff5f57; border-color: #e0443e; }
.traffic span:nth-child(2) { background: #febc2e; border-color: #d99e21; }
.traffic span:nth-child(3) { background: #28c840; border-color: #1aab29; }
.app-title {
  flex: 1;
  text-align: center;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--fg-3);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 64px;
  margin-top: 80px;
}
.site-footer .row {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  justify-content: space-between;
  align-items: flex-start;
}
.site-footer .col { min-width: 180px; }
.site-footer h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-3);
  font-weight: 500;
  margin-bottom: 12px;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.site-footer a { color: var(--fg-2); font-size: 14px; }
.site-footer a:hover { color: var(--fg); }
.site-footer .meta { color: var(--fg-3); font-size: 12px; font-family: var(--font-mono); margin-top: 8px; }

/* ---------- Utility ---------- */
.row-flex { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.grid { display: grid; gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
.grid > * { background: var(--bg-elev-1); }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--border-2);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-2);
  background: var(--bg-elev-1);
}
.divider { height: 1px; background: var(--border); margin: 32px 0; }
.muted { color: var(--fg-3); }
.mono-small { font-family: var(--font-mono); font-size: 12px; color: var(--fg-3); }

/* SVG icons inherit currentColor */
svg { display: block; }

/* ---------- Mobile hamburger toggle ---------- */
.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border-2);
  border-radius: 8px;
  color: var(--fg);
  cursor: pointer;
  margin-left: auto;
  padding: 0;
}
.nav-toggle:hover { background: var(--bg-elev-2); }
.nav-toggle .nav-toggle-close { display: none; }
.site-header.nav-open .nav-toggle .nav-toggle-open { display: none; }
.site-header.nav-open .nav-toggle .nav-toggle-close { display: block; }

/* ---------- Mobile responsive ---------- */
@media (max-width: 880px) {
  .site-header .row { gap: 12px; }

  .nav-toggle { display: inline-flex; }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px 20px 18px;
    background: color-mix(in oklab, var(--bg), transparent 0%);
    backdrop-filter: saturate(140%) blur(14px);
    -webkit-backdrop-filter: saturate(140%) blur(14px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 24px 60px -20px rgba(0,0,0,0.5);
  }
  .site-header.nav-open .nav { display: flex; }

  .nav a:not(.btn) {
    width: 100%;
    padding: 11px 12px;
    font-size: 15px;
    border-radius: 8px;
  }

  .nav-tools {
    margin-left: 0;
    padding-left: 0;
    border-left: 0;
    padding-top: 10px;
    margin-top: 6px;
    border-top: 1px solid var(--border);
    justify-content: flex-start;
    gap: 10px;
  }

  .nav .btn.primary {
    margin-left: 0 !important;
    margin-top: 10px !important;
    width: 100%;
    justify-content: center;
    height: 42px !important;
  }
}

@media (max-width: 720px) {
  section { padding: 56px 0; }
  section.hero { padding: 40px 0 56px; }
  .section-head { margin-bottom: 28px; }
  .site-footer { padding: 36px 0 48px; margin-top: 56px; }
  .site-footer .row { gap: 24px; }
  .site-footer .col { min-width: 140px; flex: 1 1 45%; }
  .hero-ctas { margin-top: 22px; }
  .hero-ctas .btn { flex: 1 1 auto; justify-content: center; }
  h1 { font-size: clamp(32px, 8vw, 44px); }
  h2 { font-size: clamp(24px, 5.6vw, 32px); }
  .lede { font-size: 16px; }
}

@media (max-width: 480px) {
  .site-footer .col { flex: 1 1 100%; }
  .kbd.lg { min-width: 30px; height: 30px; font-size: 12px; padding: 0 8px; }
}