/*
  Cloud Native Austin — shared stylesheet
  Design tokens sourced from design-system/cloud-native-austin/MASTER.md
  (Kubernetes blue + open-source dark/light palette, IBM Plex Sans / JetBrains Mono)
*/

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

/* ---------- Tokens ---------- */
:root {
  --font-sans: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f5f9;
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-border: #e2e8f0;

  --color-primary: #326ce5;
  --color-primary-dark: #1d4fbf;
  --color-primary-soft: #e8effc;
  --color-on-primary: #ffffff;

  --color-accent: #16a34a;
  --color-accent-dark: #0f7a37;
  --color-accent-soft: #dcfce7;
  --color-on-accent: #ffffff;

  --color-gold: #a16207;
  --color-gold-soft: #fef3c7;

  --color-danger: #dc2626;
  --color-focus: #326ce5;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --radius-full: 999px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  --container-max: 1120px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);

  --duration-fast: 150ms;
  --duration-base: 250ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0b1120;
    --color-bg-alt: #0f172a;
    --color-surface: #111827;
    --color-surface-alt: #1a2333;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-border: #1e293b;

    --color-primary: #6d9bf2;
    --color-primary-dark: #9dbdf7;
    --color-primary-soft: #16233f;

    --color-accent: #34d366;
    --color-accent-dark: #6ee696;
    --color-accent-soft: #123321;

    --color-gold: #e0b04b;
    --color-gold-soft: #2b2210;

    --color-danger: #f87171;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --color-bg: #0b1120;
  --color-bg-alt: #0f172a;
  --color-surface: #111827;
  --color-surface-alt: #1a2333;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-border: #1e293b;

  --color-primary: #6d9bf2;
  --color-primary-dark: #9dbdf7;
  --color-primary-soft: #16233f;

  --color-accent: #34d366;
  --color-accent-dark: #6ee696;
  --color-accent-soft: #123321;

  --color-gold: #e0b04b;
  --color-gold-soft: #2b2210;

  --color-danger: #f87171;
  color-scheme: dark;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@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;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; }

h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 var(--space-3); font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.2rem, 4.5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 var(--space-4); color: var(--color-text-muted); }
ul, ol { padding-left: 1.25rem; color: var(--color-text-muted); }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

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

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section {
  padding-block: var(--space-9);
}
.section--tight { padding-block: var(--space-7); }
.section--alt { background: var(--color-bg-alt); }

.section-heading { max-width: 720px; margin-bottom: var(--space-7); }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.grid { display: grid; gap: var(--space-5); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

.stack { display: flex; flex-direction: column; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); }

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

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -60px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  z-index: 1000;
  transition: top var(--duration-base) var(--ease-standard);
  font-weight: 600;
}
.skip-link:focus { top: var(--space-4); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-standard),
              background-color var(--duration-base) var(--ease-standard),
              border-color var(--duration-base) var(--ease-standard),
              box-shadow var(--duration-base) var(--ease-standard);
}
.btn:active { transform: translateY(1px); }
.btn svg { width: 18px; height: 18px; flex: none; }

.btn-primary { background: var(--color-accent); color: var(--color-on-accent); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--color-accent-dark); box-shadow: var(--shadow-md); }

.btn-secondary { background: var(--color-primary); color: var(--color-on-primary); }
.btn-secondary:hover { background: var(--color-primary-dark); box-shadow: var(--shadow-md); }

.btn-outline { background: transparent; border-color: var(--color-border); color: var(--color-text); }
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn-ghost { background: transparent; color: var(--color-text-muted); }
.btn-ghost:hover { color: var(--color-primary); }

.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-banner {
  background: var(--color-primary-soft);
  border-bottom: 1px solid var(--color-border);
}
.site-banner .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-1) var(--space-2);
  padding-block: var(--space-3);
}
.site-banner p {
  margin: 0;
  font-size: 0.9rem;
  text-align: center;
  color: var(--color-primary-dark);
}
.site-banner a { color: inherit; text-decoration: underline; font-weight: 600; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 97%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--color-text);
}
.brand svg { width: 40px; height: 40px; }
.brand img { width: 40px; height: 40px; object-fit: contain; }
.brand-name .region { display: block; font-family: var(--font-mono); font-weight: 500; font-size: 0.7rem; color: var(--color-text-muted); letter-spacing: 0.04em; }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--duration-fast), background var(--duration-fast);
}
.nav-links a:hover { color: var(--color-text); background: var(--color-surface-alt); }
.nav-links a[aria-current="page"] { color: var(--color-primary); background: var(--color-primary-soft); }

.nav-actions { display: flex; align-items: center; gap: var(--space-2); }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color var(--duration-fast), border-color var(--duration-fast);
}
.icon-btn:hover { color: var(--color-primary); border-color: var(--color-primary); }
.icon-btn svg { width: 18px; height: 18px; }

.theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: block; }
}
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.nav-toggle { display: none; }

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }
  .nav-links {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3) var(--space-5) var(--space-5);
    gap: 0;
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: var(--space-3); }
  .nav-cta { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-9) var(--space-8);
  background:
    radial-gradient(circle at 12% -10%, var(--color-primary-soft), transparent 55%),
    var(--color-bg);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-8);
  align-items: center;
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } }

.hero h1 { margin-bottom: var(--space-4); }
.hero-lede { font-size: 1.15rem; max-width: 52ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-6); }

.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-top: var(--space-7);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}
.stat { min-width: 120px; }
.stat-value { font-family: var(--font-mono); font-size: 1.6rem; font-weight: 700; color: var(--color-primary); }
.stat-label { font-size: 0.85rem; color: var(--color-text-muted); }

.hero-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
}
.hero-card .terminal-bar { display: flex; gap: 6px; margin-bottom: var(--space-4); }
.hero-card .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--color-border); }

/* ---------- Cards ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: transform var(--duration-base) var(--ease-standard), box-shadow var(--duration-base) var(--ease-standard), border-color var(--duration-base);
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--color-primary); }
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.card-icon svg { width: 22px; height: 22px; }
.card h3 { margin-bottom: var(--space-2); }
.card p:last-child { margin-bottom: 0; }

.tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.tag--accent { background: var(--color-accent-soft); color: var(--color-accent-dark); border-color: transparent; }
.tag--gold { background: var(--color-gold-soft); color: var(--color-gold); border-color: transparent; }

/* ---------- Sponsor logos ---------- */
.sponsor-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: var(--space-4); }
.sponsor-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.sponsor-wordmark { font-family: var(--font-mono); font-weight: 600; font-size: 1.1rem; }
.sponsor-role { font-size: 0.8rem; color: var(--color-text-muted); }

/* ---------- CTA band ---------- */
.cta-band {
  border-radius: var(--radius-lg);
  padding: var(--space-7);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #ffffff;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.cta-band h2, .cta-band p { color: #fff; }
.cta-band p { opacity: 0.9; max-width: 48ch; }
.cta-band .btn-primary { background: #ffffff; color: #1d4fbf; }
.cta-band .btn-primary:hover { background: #eef3fd; }

/* ---------- Timeline ---------- */
.timeline { list-style: none; margin: 0; padding: 0; counter-reset: step; }
.timeline li {
  position: relative;
  padding-left: var(--space-7);
  padding-bottom: var(--space-6);
  border-left: 2px solid var(--color-border);
  margin-left: 16px;
}
.timeline li:last-child { border-color: transparent; padding-bottom: 0; }
.timeline li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: -17px;
  top: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- Accordion / details ---------- */
.faq-item, .rubric-details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  margin-bottom: var(--space-3);
}
.faq-item summary, .rubric-details summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.faq-item summary::-webkit-details-marker, .rubric-details summary::-webkit-details-marker { display: none; }
.faq-item summary svg, .rubric-details summary svg { width: 18px; height: 18px; color: var(--color-text-muted); transition: transform var(--duration-base) var(--ease-standard); flex: none; }
.faq-item[open] summary svg, .rubric-details[open] summary svg { transform: rotate(180deg); }
.faq-item p, .rubric-details p { margin-top: var(--space-3); margin-bottom: 0; }

/* ---------- Track cards ---------- */
.track-card { border-top: 3px solid var(--color-primary); }
.track-card .track-letter { font-family: var(--font-mono); font-size: 0.8rem; color: var(--color-primary); font-weight: 700; }

/* ---------- Values checklist ---------- */
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-3); }
.check-list li { display: flex; gap: var(--space-3); align-items: flex-start; color: var(--color-text); }
.check-list svg { width: 20px; height: 20px; color: var(--color-accent); flex: none; margin-top: 2px; }

/* ---------- Forms (mailto / external forms only, no backend) ---------- */
.form-note {
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  background: var(--color-surface-alt);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  padding-block: var(--space-8) var(--space-6);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--space-6);
}
@media (max-width: 760px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
.footer-grid h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); margin-bottom: var(--space-3); }
.footer-links { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); }
.footer-links a { text-decoration: none; color: var(--color-text); }
.footer-links a:hover { color: var(--color-primary); }

.social-row { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.footer-bottom {
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}
.footer-bottom a { text-decoration: underline; }

/* ---------- Reveal-on-scroll ---------- */
[data-reveal] { opacity: 0; transform: translateY(16px); transition: opacity var(--duration-base) var(--ease-standard), transform var(--duration-base) var(--ease-standard); }
[data-reveal].is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- Page hero (subpages) ---------- */
.page-hero { padding-block: var(--space-8) var(--space-7); border-bottom: 1px solid var(--color-border); }
.page-hero .eyebrow { margin-bottom: var(--space-3); }
.page-hero p { max-width: 65ch; font-size: 1.05rem; }

.breadcrumb { font-family: var(--font-mono); font-size: 0.8rem; color: var(--color-text-muted); margin-bottom: var(--space-4); }
.breadcrumb a { color: var(--color-primary); text-decoration: none; }

/* ---------- 404 ---------- */
.not-found { text-align: center; padding-block: var(--space-9); }
.not-found .mono { font-size: 4rem; color: var(--color-primary); }