/* ============================================================
   main.css — kaos-control marketing site
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  transition: var(--transition-theme);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Skip-to-content link (keyboard accessibility) ───── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 200;
  padding: 0.5rem 1rem;
  background-color: var(--color-accent);
  color: #fff;
  font-weight: 600;
  border-radius: 0 0 0.375rem 0.375rem;
  text-decoration: none;
  transition: top 0.1s ease;
}

.skip-link:focus {
  top: 0;
}

/* ── Focus styles for keyboard navigation ────────────── */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

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

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

a:hover {
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

/* ── Layout utilities ─────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section {
  padding-block: 5rem;
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

.section__intro {
  max-width: 64ch;
  color: var(--color-text-muted);
  margin-top: 0.75rem;
  margin-bottom: 2.5rem;
  font-size: 1.125rem;
}

h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

/* ── Buttons ──────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
  min-height: 44px;
  min-width: 44px;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

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

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

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

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

.btn--download {
  background-color: var(--color-accent);
  color: #fff;
  width: 100%;
  justify-content: center;
  margin-block: 0.75rem;
}

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

/* ── Header & nav ─────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-theme);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: 1.5rem;
  height: 60px;
}

.nav__logo {
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-left: auto;
}

.nav__links a {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.15s ease;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav__links a:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* hamburger — hidden on desktop */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  margin-left: auto;
  min-height: 44px;
  min-width: 44px;
  align-items: center;
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
  transform-origin: center;
}

/* Animate three bars → X when menu is open */
.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Active nav link highlight */
.nav__links a.is-active {
  color: var(--color-text);
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0.375rem;
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s ease, border-color 0.15s ease;
}

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

/* Show sun in dark mode (toggle to light), moon in light mode (toggle to dark) */
[data-theme="dark"] .theme-toggle .icon-dark  { display: none; }
[data-theme="dark"] .theme-toggle .icon-light { display: block; }
[data-theme="light"] .theme-toggle .icon-dark  { display: block; }
[data-theme="light"] .theme-toggle .icon-light { display: none; }

/* ── Hero ─────────────────────────────────────────────── */
.section--hero {
  padding-block: 6rem;
  background: linear-gradient(160deg, var(--color-bg) 0%, var(--color-bg-surface) 100%);
}

.section--hero h1 {
  font-size: clamp(0.875rem, 1.5vw, 1rem);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.hero__subtitle {
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  color: var(--color-text);
}

.hero__accent {
  color: var(--color-accent);
}

.hero__tagline {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 56ch;
  margin-bottom: 2rem;
}

.hero__cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ── Benefits grid ────────────────────────────────────── */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.benefit-card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 1.75rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
  display: flex;
  flex-direction: column;
}

.benefit-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.benefit-card__icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

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

/* ── How it works ─────────────────────────────────────── */
.diagram-block {
  margin-block: 2.5rem;
}

.diagram-block figure {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  overflow: hidden;
}

.diagram-img {
  width: 100%;
  border-radius: 0.375rem;
}

.diagram-block figcaption {
  text-align: center;
  color: var(--color-text-faint);
  font-size: 0.875rem;
  margin-top: 0.75rem;
}

.how-steps {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-block: 2.5rem;
}

.how-step {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.how-step__num {
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.125rem;
}

.how-step p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* ── Download ─────────────────────────────────────────── */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.download-card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 1.75rem;
}

.download-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

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

.download-card__note {
  margin-top: 1rem;
  font-size: 0.875rem !important;
}

.download-note {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* ── Code blocks ──────────────────────────────────────── */
.code-block {
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin-top: 0.5rem;
}

.code-block code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Menlo, Monaco, 'Courier New', monospace;
  font-size: 0.875rem;
  color: var(--color-code-text);
  white-space: pre;
}

code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Menlo, Monaco, 'Courier New', monospace;
  font-size: 0.875em;
  background-color: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 0.125em 0.375em;
  border-radius: 0.25rem;
  border: 1px solid var(--color-border);
}

/* ── Getting started ──────────────────────────────────── */
.start-steps {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-bottom: 2rem;
}

.start-step {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 1.75rem;
}

.start-step h3 {
  margin-bottom: 0.75rem;
}

.start-step p {
  color: var(--color-text-muted);
  margin-top: 0.75rem;
  font-size: 0.9375rem;
}

/* ── Community ────────────────────────────────────────── */
.community-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.community-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.5rem;
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.15s ease, transform 0.15s ease;
  min-height: 44px;
}

.community-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  text-decoration: none;
}

.community-card__icon {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.community-card__label {
  font-weight: 600;
  font-size: 1rem;
}

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

.community-dco {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* ── Footer ───────────────────────────────────────────── */
.site-footer {
  background-color: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  padding-block: 2rem;
  transition: var(--transition-theme);
}

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

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

.footer__github {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.15s ease;
  min-height: 44px;
}

.footer__github:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* ── Responsive — tablet & mobile ─────────────────────── */
@media (max-width: 767px) {
  .nav__hamburger {
    display: flex;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.5rem;
    margin-left: 0;
    z-index: 99;
  }

  .nav__links.is-open {
    display: flex;
  }

  .nav__links li {
    width: 100%;
  }

  .nav__links a {
    padding-block: 0.625rem;
    width: 100%;
  }

  .section {
    padding-block: 3rem;
  }

  .section--hero {
    padding-block: 4rem;
  }

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

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

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

  .community-links {
    grid-template-columns: 1fr;
  }

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

@media (min-width: 768px) and (max-width: 1023px) {
  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .community-links {
    grid-template-columns: repeat(2, 1fr);
  }
}