/* DevJay Tools — shared stylesheet
   Palette: black, blue, white, green (no other accent colors).
   Browser support: evergreen browsers (Chrome, Firefox, Safari, Edge, last ~4 years).
   Mobile-first. Uses flex + grid + CSS variables only. No @container, no :has(),
   no CSS nesting — keeps compatibility broad.
*/

:root {
  /* Core palette */
  --black: #0a0f1a;
  --black-soft: #1a1f2e;
  --blue: #2563eb;
  --blue-hover: #1d4ed8;
  --blue-soft: #eff4ff;
  --green: #10b981;
  --green-hover: #059669;
  --green-soft: #ecfdf5;
  --white: #ffffff;
  --off-white: #f7f9fc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --muted: #5a6477;
  --muted-2: #8a94a8;

  /* Semantic tokens */
  --fg: var(--black);
  --fg-muted: var(--muted);
  --bg: var(--off-white);
  --bg-card: var(--white);
  --accent: var(--blue);
  --accent-hover: var(--blue-hover);
  --accent-soft: var(--blue-soft);
  --success: var(--green);
  --success-hover: var(--green-hover);
  --success-soft: var(--green-soft);
  --danger: #dc2626;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --maxw: 800px;

  --shadow-sm: 0 1px 2px rgba(10, 15, 26, 0.04);
  --shadow: 0 2px 8px rgba(10, 15, 26, 0.06);
  --shadow-lg: 0 8px 24px rgba(10, 15, 26, 0.08);

  --transition: 150ms ease;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

main {
  flex: 1;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 20px 56px;
}

/* ---------- Header ---------- */

header.site-header {
  background: var(--black);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}

header.site-header .wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

header.site-header a.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 17px;
  color: var(--white);
  text-decoration: none;
  letter-spacing: -0.01em;
}

header.site-header a.brand .dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
}

header.site-header nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

header.site-header nav a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

header.site-header nav a:hover {
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

header.site-header nav a.cta {
  color: var(--white);
  background: var(--green);
}

header.site-header nav a.cta:hover { background: var(--green-hover); }

/* ---------- Footer ---------- */

footer.site-footer {
  border-top: 1px solid var(--border);
  background: var(--white);
  color: var(--fg-muted);
  font-size: 14px;
}

footer.site-footer .wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: space-between;
}

footer.site-footer a {
  color: var(--fg-muted);
  text-decoration: none;
  margin-right: 14px;
  transition: color var(--transition);
}

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

/* ---------- Typography ---------- */

h1 {
  font-size: 32px;
  line-height: 1.15;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
  font-weight: 700;
}

h2 {
  font-size: 22px;
  line-height: 1.25;
  margin: 36px 0 12px;
  letter-spacing: -0.01em;
  font-weight: 700;
}

h3 {
  font-size: 17px;
  margin: 20px 0 8px;
  font-weight: 600;
}

p { margin: 0 0 12px; }

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); text-decoration: underline; }

.muted { color: var(--fg-muted); font-size: 14px; }

/* ---------- Buttons ---------- */

button, .btn {
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  padding: 11px 20px;
  min-height: 44px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}

button:hover, .btn:hover {
  background: var(--accent-hover);
  color: var(--white);
  text-decoration: none;
  box-shadow: var(--shadow);
}

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

button:disabled, .btn:disabled {
  background: var(--border-strong);
  color: var(--white);
  cursor: not-allowed;
  box-shadow: none;
}

button.secondary, .btn.secondary {
  background: var(--white);
  color: var(--fg);
  border: 1px solid var(--border);
}

button.secondary:hover, .btn.secondary:hover {
  background: var(--off-white);
  color: var(--fg);
  border-color: var(--border-strong);
}

button.success, .btn.success {
  background: var(--success);
}

button.success:hover, .btn.success:hover {
  background: var(--success-hover);
}

button.ghost, .btn.ghost {
  background: transparent;
  color: var(--accent);
  box-shadow: none;
}

button.ghost:hover, .btn.ghost:hover {
  background: var(--accent-soft);
}

button.icon {
  padding: 0;
  width: 40px;
  min-height: 40px;
  min-width: 40px;
}

/* ---------- Form elements ---------- */

input, textarea, select {
  font: inherit;
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--fg);
  min-height: 44px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

textarea {
  min-height: 160px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", monospace;
  font-size: 14px;
  line-height: 1.5;
  resize: vertical;
}

label {
  display: block;
  margin: 16px 0 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
}

input[type="checkbox"], input[type="radio"] {
  width: auto;
  min-height: auto;
  margin-right: 6px;
  vertical-align: middle;
  accent-color: var(--accent);
}

input[type="range"] {
  padding: 0;
  min-height: auto;
  accent-color: var(--accent);
}

input[type="file"] { padding: 8px; }

/* ---------- Layout helpers ---------- */

.row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 16px 0;
}

.stack { display: flex; flex-direction: column; gap: 10px; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 14px 0;
  box-shadow: var(--shadow-sm);
}

.card h3 { margin-top: 0; }

/* ---------- Hero / callouts ---------- */

.hero {
  padding: 8px 0 12px;
}

.hero .tag {
  display: inline-block;
  background: var(--green-soft);
  color: var(--green-hover);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}

.notice {
  background: var(--blue-soft);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  margin: 18px 0;
  border-radius: 8px;
  font-size: 14px;
  color: var(--fg);
}

.notice.green {
  background: var(--green-soft);
  border-left-color: var(--success);
}

.error {
  color: var(--danger);
  font-size: 14px;
  margin-top: 8px;
}

/* ---------- Code ---------- */

pre {
  background: var(--black);
  color: #e2e8f0;
  border-radius: var(--radius);
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.55;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", monospace;
}

p code, li code {
  background: var(--off-white);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* ---------- Mobile tweaks ---------- */

@media (max-width: 640px) {
  main { padding: 20px 16px 40px; }
  h1 { font-size: 26px; }
  h2 { font-size: 19px; margin-top: 28px; }
  header.site-header .wrap { padding: 12px 16px; }
  header.site-header nav a { padding: 6px 10px; }
  footer.site-footer .wrap { padding: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}