/* ============================================================
   Shared styles for gatsby.alternative.to subpages.
   Mirror of DESIGN.md tokens — same as the inline block on the landing.
   ============================================================ */
:root {
  --color-primary: #1A67FD;
  --color-secondary: #0A0D16;
  --color-tertiary: #BFFF5A;
  --color-neutral: #FCFCFD;
  --color-text-primary: #0A0D16;
  --color-text-secondary: #4E5057;
  --color-text-tertiary: #74767C;
  --color-surface-100: #FCFCFD;
  --color-surface-200: #F8F8FC;
  --color-surface-300: #F6F6F9;
  --color-surface-400: #F0F0F9;
  --color-border-100: #EBEEF7;
  --color-border-200: #D5D9E8;
  --color-status-success: #19F79A;
  --color-status-warning: #FFC650;
  --color-status-error: #FF806E;
  --color-status-info: #46D8FF;
  --color-green-100: #5DF7B6;
  --color-green-200: #19F79A;
  --color-green-light-100: #CCFF89;
  --color-orange-100: #FFB55E;
  --color-red-100: #FF9688;
  --color-positive-400: #38A865;

  --shadow-base: #0A0D1633;
  --shadow-panel: #0A0D1614;
  --shadow-cta-ambient: #1D21300A;
  --shadow-cta-glow: #19F79A14;
  --shadow-cta-edge: #11111129;
  --color-surface-100-80: #FCFCFDCC;

  --font-sans: "IBM Plex Sans", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-2xl: 56px;
  --radius-full: 9999px;

  --spacing-2xs: 4px;
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 72px;
  --spacing-grid: 24px;
  --spacing-content-max: 1200px;
}

[data-theme="dark"] {
  --color-primary: #5B8FFF;
  --color-text-primary: #B8B8BC;
  --color-text-secondary: #87878B;
  --color-text-tertiary: #868688;
  --color-surface-100: #17171C;
  --color-surface-200: #1E1E24;
  --color-surface-300: #17171C;
  --color-surface-400: #17171C;
  --color-border-100: #22242A;
  --color-border-200: #292C32;
  --color-surface-100-80: #17171CCC;
}

*, *::before, *::after { box-sizing: border-box; }
html {
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background-color: var(--color-surface-100);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}
body { margin: 0; container-type: inline-size; font-size: 16px; line-height: 24px; }
h1, h2, h3, h4, p, ul, figure { margin: 0; }
a { color: inherit; }
::selection { background-color: var(--color-tertiary); color: var(--color-secondary); }

.t-h1 { font-size: 48px; font-weight: 700; line-height: 48px; letter-spacing: -1px; }
.t-h2 { font-size: 22px; font-weight: 700; line-height: 24px; letter-spacing: -1px; }
.t-h3 { font-size: 18px; font-weight: 700; line-height: 24px; letter-spacing: -1px; }
.t-h4 { font-size: 16px; font-weight: 600; line-height: 24px; }
.t-body { font-size: 16px; font-weight: 400; line-height: 24px; }
.t-body-sm { font-size: 13px; font-weight: 400; line-height: 24px; }
.t-label { font-size: 11px; font-weight: 500; line-height: 16px; }

.hatch {
  flex: 1; align-self: stretch; min-width: 24px;
  background-image: repeating-linear-gradient(135deg, transparent 0 4px, var(--color-border-200) 4px 5px);
  opacity: 0.6;
}

.site-header {
  position: sticky; top: 0; z-index: 50; width: 100%;
  background-color: var(--color-surface-100);
  box-shadow: 0 1px 0 0 var(--shadow-panel);
  transition: background-color 160ms ease;
}
.site-header.is-scrolled {
  background-color: var(--color-surface-100-80);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.header-rule {
  position: fixed; top: 72px; left: 0; right: 0; height: 4px; z-index: 49;
  pointer-events: none; opacity: 0;
  background: linear-gradient(90deg, #FFA030, #C19AFF, #46D8FF, #19F79A, #B7FF5A);
  filter: blur(8px); transition: opacity 180ms ease;
}
.site-header.is-scrolled + .header-rule { opacity: 1; }
.header-inner {
  max-width: var(--spacing-content-max); margin: 0 auto; height: 72px;
  padding-inline: var(--spacing-lg);
  display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-md);
}
.brand { display: flex; align-items: center; gap: var(--spacing-xs); text-decoration: none; color: var(--color-text-primary); }
.brand-name { font-size: 14px; font-weight: 600; line-height: 32px; }
.brand-sep { color: var(--color-text-tertiary); font-weight: 400; }
.brand-host { color: var(--color-text-tertiary); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--spacing-xs);
  height: 40px; padding-inline: var(--spacing-lg);
  font-family: inherit; font-size: 14px; font-weight: 600; line-height: 32px;
  border-radius: var(--radius-2xl); border: 2px solid var(--color-secondary);
  text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: box-shadow 80ms ease-out, transform 80ms ease-out;
}
.btn-primary { background-color: var(--color-tertiary); color: var(--color-secondary); box-shadow: inset 0 -3px 0 0 var(--shadow-base); }
.btn-primary:hover { box-shadow: inset 0 0 0 0 var(--shadow-base); }
.btn-primary:active { box-shadow: inset 0 4px 0 0 var(--shadow-base); }
.btn-secondary { background-color: var(--color-neutral); color: var(--color-secondary); box-shadow: inset 0 -3px 0 0 var(--shadow-base); }
.btn-secondary:hover { box-shadow: inset 0 0 0 0 var(--shadow-base); }
.btn-secondary:active { box-shadow: inset 0 4px 0 0 var(--shadow-base); }
[data-theme="dark"] .btn { border-color: var(--color-border-200); }
a:focus-visible, summary:focus-visible, button:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: 4px; }

main {
  background-color: var(--color-surface-100);
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--color-border-100) 55%, var(--color-surface-100)) 0 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--color-border-100) 55%, var(--color-surface-100)) 0 1px, transparent 1px);
  background-size: var(--spacing-grid) var(--spacing-grid);
  background-position: calc(50% - 12px) 0;
}
.wrap { max-width: var(--spacing-content-max); margin: 0 auto; padding-inline: var(--spacing-lg); }
.section { padding-block: var(--spacing-3xl); }
.card {
  background-color: var(--color-surface-100);
  border: 1px solid var(--color-border-100);
  box-shadow: 1px 1px 0 0 var(--color-border-100);
  border-radius: var(--radius-lg);
}
.eyebrow {
  display: inline-block; font-family: var(--font-sans);
  font-size: 11px; font-weight: 500; line-height: 16px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-sm);
}
.section-sub { color: var(--color-text-secondary); max-width: 640px; margin-top: var(--spacing-sm); }

.hero { padding-top: var(--spacing-3xl); padding-bottom: var(--spacing-2xl); }
.hero-crumb { display: flex; align-items: center; gap: var(--spacing-2xs); margin-bottom: var(--spacing-lg); flex-wrap: wrap; }
.hero-crumb a { color: var(--color-text-tertiary); text-decoration: none; }
.hero-crumb a:hover { color: var(--color-primary); }
.hero-crumb span { color: var(--color-text-tertiary); }
.hero h1 { max-width: 760px; }
.hero h1 em { font-style: normal; color: var(--color-primary); }
.hero-lead { margin-top: var(--spacing-lg); max-width: 640px; color: var(--color-text-secondary); font-size: 18px; }
.hero-actions { margin-top: var(--spacing-xl); display: flex; gap: var(--spacing-sm); flex-wrap: wrap; }
.hero-meta { margin-top: var(--spacing-md); }
.hero-meta, .hero-meta * { color: var(--color-text-tertiary); font-size: 13px; }

.tldr {
  margin-top: var(--spacing-xl); padding: var(--spacing-lg);
  background-color: var(--color-surface-200);
  border: 1px solid var(--color-border-100);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-sm); max-width: 760px;
}
.tldr .eyebrow { margin-bottom: var(--spacing-xs); color: var(--color-primary); }
.tldr p { color: var(--color-text-secondary); font-size: 14px; }
.tldr ul { margin-top: var(--spacing-sm); padding-left: var(--spacing-lg); display: flex; flex-direction: column; gap: var(--spacing-2xs); }
.tldr li { font-size: 14px; color: var(--color-text-primary); }
.tldr strong { font-weight: 700; }

.table-wrap { margin-top: var(--spacing-2xl); overflow-x: auto; border: 1px solid var(--color-border-100); border-radius: var(--radius-sm); background-color: var(--color-surface-200); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
thead tr { background-color: var(--color-surface-300); }
th {
  text-align: left; padding: var(--spacing-xs) var(--spacing-md);
  font-size: 11px; font-weight: 500; line-height: 16px; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--color-text-secondary); white-space: nowrap;
  border-bottom: 1px solid var(--color-border-200);
}
th.hl, td.hl { background-color: color-mix(in srgb, var(--color-tertiary) 22%, var(--color-surface-200)); }
tbody tr { border-bottom: 1px solid var(--color-border-100); }
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background-color: var(--color-surface-300); }
td { padding: var(--spacing-sm) var(--spacing-md); color: var(--color-text-primary); vertical-align: top; }
td .tool { font-weight: 600; }
.yes { color: var(--color-positive-400); font-weight: 700; }
.no { color: var(--color-text-tertiary); font-weight: 700; }
.muted { color: var(--color-text-tertiary); font-size: 13px; }
.sources a { color: var(--color-text-secondary); text-decoration: underline; text-underline-offset: 2px; }
.sources a:hover { color: var(--color-primary); }

.prose { margin-top: var(--spacing-2xl); max-width: 720px; display: flex; flex-direction: column; gap: var(--spacing-lg); }
.prose p { color: var(--color-text-secondary); font-size: 16px; line-height: 26px; }
.prose h3 { color: var(--color-text-primary); }
.prose strong { color: var(--color-text-primary); font-weight: 700; }
.prose code { font-family: var(--font-mono); font-size: 14px; background-color: var(--color-surface-300); padding: 1px 5px; border-radius: 4px; }
.prose a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 2px; }

.why { background-color: var(--color-surface-200); border-top: 1px solid var(--color-border-100); border-bottom: 1px solid var(--color-border-100); }
.features { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--spacing-xl); margin-top: var(--spacing-2xl); }
.feature { display: flex; gap: var(--spacing-md); }
.feature-mark { flex-shrink: 0; width: 40px; height: 40px; border-radius: var(--radius-md); background-color: color-mix(in srgb, var(--color-tertiary) 30%, var(--color-surface-100)); display: flex; align-items: center; justify-content: center; font-size: 18px; }
.feature h3 { margin-bottom: var(--spacing-2xs); }
.feature p { color: var(--color-text-secondary); font-size: 14px; }
.feature p a { color: var(--color-primary); }

.faq { background-color: var(--color-surface-200); border-top: 1px solid var(--color-border-100); }
.faq-list { margin-top: var(--spacing-2xl); border: 1px solid var(--color-border-100); border-radius: var(--radius-sm); overflow: hidden; background-color: var(--color-surface-100); }
details { border-bottom: 1px solid var(--color-border-100); }
details:last-child { border-bottom: none; }
summary { list-style: none; cursor: pointer; padding: var(--spacing-md) var(--spacing-lg); display: flex; justify-content: space-between; align-items: center; gap: var(--spacing-md); font-weight: 600; font-size: 15px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-size: 20px; font-weight: 300; color: var(--color-text-tertiary); flex-shrink: 0; }
details[open] summary { color: var(--color-primary); }
details[open] summary::after { content: "−"; }
.faq-answer { padding: 0 var(--spacing-lg) var(--spacing-md); color: var(--color-text-secondary); font-size: 14px; }
.faq-answer a { color: var(--color-primary); text-decoration: underline; }

.cta-wrap { padding-block: var(--spacing-3xl); }
.cta-banner {
  background-color: var(--color-green-100); color: var(--color-secondary);
  border-radius: 14px; padding: var(--spacing-2xl); text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: var(--spacing-md);
  box-shadow:
    0 3px 0 0 var(--shadow-cta-ambient), 0 6px 0 0 var(--shadow-cta-ambient),
    0 12px 0 0 var(--shadow-cta-ambient), 0 24px 0 0 var(--shadow-cta-ambient),
    0 32px 0 0 var(--shadow-cta-glow), 0 44px 0 0 var(--shadow-cta-glow),
    inset 0 0 0 1px var(--shadow-cta-edge);
}
.cta-eyebrow { font-size: 11px; font-weight: 500; line-height: 16px; letter-spacing: 0.08em; text-transform: uppercase; }
.cta-banner h2 { max-width: 520px; }
.cta-banner p { max-width: 520px; font-size: 13px; }
.cta-banner .btn { margin-top: var(--spacing-xs); }

footer { background-color: var(--color-surface-100); box-shadow: 0 -1px 0 0 var(--shadow-panel); padding-block: var(--spacing-2xl); }
.footer-copy { display: flex; align-items: center; gap: var(--spacing-2xs); margin-bottom: var(--spacing-lg); }
.footer-copy .year { font-size: 13px; font-weight: 700; }
.footer-meta { display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-md); flex-wrap: wrap; }
.footer-links { display: flex; gap: var(--spacing-lg); flex-wrap: wrap; }
.footer-links a { font-size: 13px; color: var(--color-text-secondary); text-decoration: none; }
.footer-links a:hover { color: var(--color-text-primary); }
.theme-toggle {
  width: 32px; height: 32px; display: flex; align-items: center; justify-content: center;
  background-color: var(--color-surface-100); border: 1px solid var(--color-border-200);
  box-shadow: 2px 2px 0 0 var(--color-surface-400); color: var(--color-text-secondary);
  cursor: pointer; flex-shrink: 0;
}
.theme-toggle:hover { color: var(--color-text-primary); border-color: var(--color-text-primary); }
.theme-toggle .moon { display: none; }
[data-theme="dark"] .theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .moon { display: block; }

@media (max-width: 767px) {
  main { background-image: none; }
  .t-h1 { font-size: 32px; line-height: 36px; }
  .section { padding-block: var(--spacing-2xl); }
  .header-rule { top: 56px; }
}