/* InferASIC - minimal dark technical aesthetic */

:root {
  --bg: #0c0c0d;
  --bg-elevated: #141416;
  --text: #e4e4e7;
  --text-muted: #71717a;
  --border: #27272a;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --max-width: 720px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", Consolas, monospace;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Layout */
.page {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
}

.logo:hover {
  color: var(--accent);
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--space-lg);
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
}

.nav a:hover {
  color: var(--text);
}

.nav a[href].active {
  color: var(--text);
  font-weight: 500;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  color: var(--text);
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: currentColor;
  width: 18px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .nav-toggle[hidden] {
    display: none;
  }

  .nav-toggle:not([hidden]) {
    display: flex;
  }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: var(--space-sm);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.2s ease, opacity 0.2s ease;
  }

  .nav.nav-open {
    max-height: 280px;
    opacity: 1;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-list li {
    border-bottom: 1px solid var(--border);
  }

  .nav-list li:last-child {
    border-bottom: none;
  }

  .nav a {
    display: block;
    padding: var(--space-sm);
  }

  .header-inner {
    position: relative;
  }
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
  text-align: center;
}

.footer-stage {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0 0 var(--space-sm);
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.footer-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
}

.footer-nav a:hover {
  color: var(--text);
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0 0 var(--space-xs);
}

.footer-byline {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0;
}

.footer-byline a {
  color: var(--text-muted);
  text-decoration: none;
}

.footer-byline a:hover {
  color: var(--text);
}

/* Typography */
h1, h2, h3 {
  font-weight: 600;
  line-height: 1.25;
  margin-top: 0;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: var(--space-md);
}

h2 {
  font-size: 1.375rem;
  margin-bottom: var(--space-sm);
  margin-top: var(--space-xl);
}

h2:first-child {
  margin-top: 0;
}

h3 {
  font-size: 1.0625rem;
  margin-bottom: var(--space-xs);
  margin-top: var(--space-md);
}

p {
  margin: 0 0 var(--space-md);
  color: var(--text);
}

p:last-child {
  margin-bottom: 0;
}

.lead {
  font-size: 1.125rem;
  color: var(--text-muted);
}

/* Hero */
.hero {
  padding: var(--space-xl) 0;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.hero-text {
  text-align: center;
}

.hero .lead {
  margin-bottom: var(--space-md);
  max-width: 36em;
  margin-left: auto;
  margin-right: auto;
}

.hero-text .lead:last-of-type {
  margin-bottom: var(--space-lg);
}

.hero-media {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: var(--space-md);
}

/* Concept render card: frame for white-background image on dark site */
.concept-render-card {
  position: relative;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: var(--space-md);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  width: 100%;
  max-width: 420px;
}

.concept-render-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
  background: #fff;
}

.concept-badge {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.55);
  color: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.concept-caption {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: var(--space-sm) 0 0;
  max-width: 420px;
  text-align: center;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--text-muted);
  color: var(--text);
}

/* Cards */
.card-grid {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

@media (min-width: 600px) {
  .card-grid-2,
  .card-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: var(--space-md);
}

.card:hover {
  border-color: var(--text-muted);
}

.card h3 {
  margin-top: 0;
  font-size: 1rem;
}

.card p {
  font-size: 0.9375rem;
  margin-bottom: 0;
  color: var(--text-muted);
}

/* Lists */
.bullet-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-md);
}

.bullet-list li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-xs);
}

.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
}

/* Roadmap */
.roadmap {
  margin-top: var(--space-md);
}

.roadmap-phase {
  border-left: 2px solid var(--border);
  padding-left: var(--space-md);
  margin-bottom: var(--space-lg);
}

.roadmap-phase:last-child {
  margin-bottom: 0;
}

.roadmap-phase h3 {
  margin-top: 0;
  font-size: 0.9375rem;
  color: var(--text-muted);
  font-weight: 500;
}

.roadmap-phase p {
  margin-bottom: 0;
  font-size: 0.9375rem;
}

/* Notice / disclaimer */
.notice {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: var(--space-md);
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-top: var(--space-lg);
}

/* Contact */
.contact-intro {
  margin-bottom: var(--space-lg);
}

.contact-email {
  font-family: var(--font-mono);
  font-size: 1rem;
  word-break: break-all;
}

.contact-email a {
  color: var(--accent);
  text-decoration: none;
}

.contact-email a:hover {
  text-decoration: underline;
}

.contact-founder {
  margin-top: var(--space-md);
}

.contact-founder a {
  color: var(--accent);
  text-decoration: none;
}

.contact-founder a:hover {
  text-decoration: underline;
}

/* Section spacing */
.section {
  margin-bottom: var(--space-xl);
}

.section:last-child {
  margin-bottom: 0;
}

/* Active nav state: set via JS or server */
body[data-page="home"] .nav a[href="index.html"],
body[data-page="vision"] .nav a[href="vision.html"],
body[data-page="hardware"] .nav a[href="hardware.html"],
body[data-page="architecture"] .nav a[href="architecture.html"],
body[data-page="status"] .nav a[href="status.html"],
body[data-page="contact"] .nav a[href="contact.html"] {
  color: var(--text);
  font-weight: 500;
}