/* ============================================================
   Spektacular — Design System
   Dark terminal aesthetic, purple AI accent
   ============================================================ */

/* ── Reset & Box Model ─────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Design Tokens ─────────────────────────────────────────── */
:root {
  /* Backgrounds */
  --bg-base:      #0d1117;
  --bg-surface:   #161b22;
  --bg-elevated:  #21262d;
  --bg-code:      #1c2128;

  /* Borders */
  --border-subtle:  #30363d;
  --border-default: #3d444d;

  /* Text */
  --text-primary:   #e6edf3;
  --text-secondary: #8b949e;
  --text-muted:     #656d76;

  /* Accent — Purple */
  --accent-primary: #7c3aed;
  --accent-light:   #a78bfa;
  --accent-subtle:  #1a1033;

  /* Terminal green */
  --terminal-green:     #3fb950;
  --terminal-green-dim: #238636;

  /* Link blue */
  --link-blue: #58a6ff;

  /* Spacing scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;
}

/* ── Base ───────────────────────────────────────────────────── */
html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-base);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link-blue);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

code, kbd, pre, .terminal {
  font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", ui-monospace,
    "SFMono-Regular", Consolas, monospace;
}

/* ── Typography ─────────────────────────────────────────────── */
h1 {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.625rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.3;
}

p {
  color: var(--text-secondary);
  max-width: 65ch;
}

/* ── Layout Utilities ───────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container--narrow {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-xl) 0;
}

.section--alt {
  background: var(--bg-surface);
}

.section__header {
  margin-bottom: var(--space-lg);
}

.section__header h2 {
  margin-bottom: var(--space-xs);
}

.section__header p {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* ── Badge ──────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badge--purple {
  background: var(--accent-subtle);
  color: var(--accent-light);
  border: 1px solid var(--accent-primary);
}

.badge--green {
  background: #0d2010;
  color: var(--terminal-green);
  border: 1px solid var(--terminal-green-dim);
}

.badge__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--terminal-green);
  display: inline-block;
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.375rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.btn--primary {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}
.btn--primary:hover {
  background: #6d28d9;
  border-color: #6d28d9;
  text-decoration: none;
  color: #fff;
}

.btn--secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-default);
}
.btn--secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--text-secondary);
  text-decoration: none;
  color: var(--text-primary);
}

.btn--lg {
  padding: 0.75rem 1.75rem;
  font-size: 1rem;
}

/* ── Code Blocks ────────────────────────────────────────────── */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.code-block pre {
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--text-primary);
}

.code-block code {
  color: var(--text-primary);
}

/* Inline code */
:not(pre) > code {
  background: var(--bg-elevated);
  color: var(--accent-light);
  padding: 0.1em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.875em;
}

/* ── Install Block ──────────────────────────────────────────── */
.install-block {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 1.25rem;
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  font-size: 0.9375rem;
}

.install-block__prefix {
  color: var(--terminal-green);
  font-weight: 700;
  user-select: none;
}

.install-block__cmd {
  color: var(--text-primary);
}

.copy-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

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

.copy-btn.copied {
  background: #0d2010;
  color: var(--terminal-green);
  border-color: var(--terminal-green-dim);
}

/* ============================================================
   Navigation
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(22, 27, 34, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav__logo {
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav__logo:hover {
  color: var(--accent-light);
  text-decoration: none;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
}

.nav__links a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  transition: color 0.15s;
  text-decoration: none;
}
.nav__links a:hover,
.nav__links a.active {
  color: var(--text-primary);
  text-decoration: none;
}

.nav__links .nav__github {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.nav__github svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ============================================================
   Hero Section
   ============================================================ */
.hero {
  padding: 5rem 0 4rem;
  text-align: center;
}

.hero__eyebrow {
  margin-bottom: 1.5rem;
}

.hero__headline {
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.hero__headline span {
  display: block;
}

.hero__sub {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 52ch;
  margin: 0 auto 2rem;
}

.hero__install {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
}

.hero__ctas {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   Demo / Screenshot
   ============================================================ */
.demo {
  padding: 0 0 var(--space-xl);
}

.demo__inner {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.demo__caption {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
  padding: 0.75rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
  max-width: none;
}

.demo__image {
  width: 100%;
  display: block;
}

/* ============================================================
   Pipeline Diagram (How It Works)
   ============================================================ */
.pipeline-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin: 2.5rem 0 2rem;
  flex-wrap: wrap;
  row-gap: 1rem;
}

.pipeline-node {
  text-align: center;
  padding: 1.25rem 1rem;
  border-radius: var(--radius-md);
  min-width: 120px;
}

.pipeline-node--file,
.pipeline-node--output {
  background: var(--bg-code);
  border: 1px dashed var(--border-default);
}

.pipeline-node--step {
  background: var(--accent-subtle);
  border: 1px solid var(--accent-primary);
}

.pipeline-node__icon {
  font-size: 1.5rem;
  margin-bottom: 0.375rem;
}

.pipeline-node__name {
  font-weight: 700;
  color: var(--accent-light);
  font-size: 1rem;
  margin-bottom: 0.375rem;
}

.pipeline-node__label {
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
}

.pipeline-node__sub {
  font-size: 0.725rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.pipeline-node__detail {
  font-size: 0.675rem;
  color: var(--text-muted);
  margin-top: 0.375rem;
  line-height: 1.4;
}

.pipeline-connector {
  display: flex;
  align-items: center;
  padding: 0 0.5rem;
  color: var(--text-muted);
  font-size: 1.25rem;
  user-select: none;
}

.pipeline-annotations {
  text-align: center;
}
.pipeline-annotations p {
  max-width: 58ch;
  margin: 0 auto;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

/* ── Pipeline Stages (three-subsection layout) ───────────── */
.pipeline-stage {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
}

.pipeline-stage:first-of-type {
  margin-top: var(--space-md);
  padding-top: 0;
  border-top: none;
}

.pipeline-stage__title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.pipeline-stage__number {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent-subtle);
  border: 1px solid var(--accent-primary);
  color: var(--accent-light);
  font-weight: 700;
  font-size: 0.8125rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ============================================================
   Features Grid
   ============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: var(--accent-primary);
}

.feature-card__icon {
  font-size: 1.625rem;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  max-width: none;
  margin: 0;
}

/* ============================================================
   CTA Banner
   ============================================================ */
.cta-banner {
  background: var(--accent-subtle);
  border-top: 1px solid rgba(124, 58, 237, 0.3);
  border-bottom: 1px solid rgba(124, 58, 237, 0.3);
  padding: var(--space-xl) 0;
  text-align: center;
}

.cta-banner h2 {
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.cta-banner p {
  font-size: 1.0625rem;
  margin: 0 auto 2rem;
  max-width: 48ch;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 1.75rem 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer__copy {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer__copy a {
  color: var(--text-secondary);
}
.footer__copy a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.footer__links a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

/* ============================================================
   Page Hero (how-it-works.html)
   ============================================================ */
.page-hero {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.page-hero h1 {
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  margin-bottom: 0.75rem;
}

.page-hero__sub {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 60ch;
  margin: 0;
}

/* ============================================================
   Quick Start Steps
   ============================================================ */
.steps {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.step {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem 1.25rem;
  align-items: start;
}

.step__number {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: var(--accent-subtle);
  border: 1px solid var(--accent-primary);
  color: var(--accent-light);
  font-weight: 700;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step__content h3 {
  color: var(--text-primary);
  margin-bottom: 0.375rem;
}

.step__content p {
  font-size: 0.9375rem;
  margin-bottom: 0.75rem;
}

.step__content .code-block {
  margin-top: 0.5rem;
}

/* ============================================================
   Spec Format (two-column layout)
   ============================================================ */
.spec-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2.5rem;
  align-items: start;
}

.spec-annotations {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.spec-annotation {
  padding: 0.875rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.spec-annotation__section {
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--accent-light);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.spec-annotation p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  max-width: none;
  margin: 0;
}

/* ============================================================
   Config Reference
   ============================================================ */
.config-intro {
  margin: 0 0 1.5rem;
  font-size: 1rem;
}

/* ============================================================
   Roadmap
   ============================================================ */
.roadmap {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.roadmap-item {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 1.25rem;
  align-items: start;
}

.roadmap-item__version {
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--accent-light);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-primary);
  border-radius: var(--radius-pill);
  padding: 0.25rem 0.75rem;
  text-align: center;
  white-space: nowrap;
}

.roadmap-item__version--next {
  color: var(--terminal-green);
  background: #0d2010;
  border-color: var(--terminal-green-dim);
}

.roadmap-item__content h3 {
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.roadmap-item__content ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.roadmap-item__content ul li {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  padding-left: 1rem;
  position: relative;
}

.roadmap-item__content ul li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

/* ============================================================
   Responsive Breakpoints
   ============================================================ */

/* Tablet */
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .spec-layout {
    grid-template-columns: 1fr;
  }

  .pipeline-diagram {
    gap: 0;
  }
}

/* Mobile */
@media (max-width: 640px) {
  :root {
    --space-xl: 4rem;
    --space-lg: 2.5rem;
  }

  .nav__links {
    gap: var(--space-sm);
  }

  /* Hide "How it works" text, keep GitHub icon */
  .nav__links li:first-child a {
    display: none;
  }

  .hero {
    padding: 3rem 0 2.5rem;
  }

  .hero__ctas {
    flex-direction: column;
    align-items: center;
  }

  .hero__ctas .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .pipeline-diagram {
    flex-direction: column;
    align-items: center;
  }

  .pipeline-connector {
    transform: rotate(90deg);
    padding: 0.25rem 0;
  }

  .steps .step {
    grid-template-columns: 2rem 1fr;
  }

  .roadmap-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .roadmap-item__version {
    width: fit-content;
  }

  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  .cta-buttons .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
}