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

:root {
  --bg: #0e1923;
  --bg-subtle: #0b1219;
  --bg-card: #132030;
  --border: #1e3a5f;
  --text: #d6e8ee;
  --text-muted: #7ba4bd;
  --accent: #7ebae4;
  --accent-hover: #a3d5f7;
  --accent-dim: #3a7cb8;
  --accent-glow: rgba(126, 186, 228, 0.12);
  --code-bg: #091018;
  --scrollbar: #5277c3;
  --font-mono: "Fira Code", "JetBrains Mono", Monaco, Consolas, "Ubuntu Mono", monospace;
  --max-width: 1080px;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-mono);
  background: var(--bg);
  color: var(--text);
  line-height: 1.54;
  overflow-x: hidden;
  font-size: 1rem;
}

/* scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-hover);
}

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

/* ── Typography ──────────────────────────────────────── */
h1, h2, h3 {
  line-height: 1.2;
  font-weight: 600;
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.section-glyph {
  text-align: center;
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
  opacity: 0.7;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 600px;
  margin: 0 auto 3rem;
}

/* ── Layout ──────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 5rem 0;
}

section:nth-child(even) {
  background: var(--bg-subtle);
}

/* ── Nav ─────────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(14, 25, 35, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

.nav-brand img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
  padding-bottom: 4px;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s ease;
}

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

.nav-links a:hover::after {
  transform: scaleX(1);
}

.nav-links .btn-sm::after {
  display: none;
}

.nav-links .btn-sm {
  color: var(--bg);
  background: var(--accent);
  padding: 0.4rem 1rem;
  font-weight: 600;
}

.nav-links .btn-sm:hover {
  background: var(--accent-hover);
  color: var(--bg);
}

/* mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  font-family: var(--font-mono);
}

/* ── Hero ────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 64px;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, var(--accent-glow), transparent);
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.hero-portrait {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: 3px solid var(--accent-dim);
  box-shadow: 0 0 40px var(--accent-glow);
  transition: transform 0.3s, box-shadow 0.3s;
}

.hero-portrait:hover {
  transform: scale(1.05);
  box-shadow: 0 0 60px rgba(126, 186, 228, 0.25);
}

.hero h1 {
  font-size: 3rem;
  letter-spacing: -0.02em;
}

.hero h1 .accent {
  color: var(--accent);
}

.hero-tagline {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

/* ── Buttons ─────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  font-weight: 600;
  font-size: 0.9rem;
  font-family: var(--font-mono);
  transition: all 0.2s;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--bg);
  box-shadow: 0 4px 20px var(--accent-glow);
}

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

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

.btn-outline .icon {
  width: 18px;
  height: 18px;
}

/* ── Install Banner ──────────────────────────────────── */
.install-banner {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 0.65rem 1.25rem;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color 0.2s;
  position: relative;
}

.install-banner:hover {
  border-color: var(--accent-dim);
}

.install-banner code {
  color: var(--accent);
}

.install-banner .copy-hint {
  font-size: 0.7rem;
  opacity: 0.5;
}

.install-banner .copied-tooltip {
  position: absolute;
  top: -32px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-dim);
  color: var(--text);
  padding: 0.25rem 0.6rem;
  font-size: 0.7rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.install-banner .copied-tooltip.show {
  opacity: 1;
}

/* ── Features ────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
}

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

.feature-icon {
  display: block;
  margin-bottom: 0.75rem;
  line-height: 0;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
}

.feature-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.54;
}

/* ── Why NixOS Section ───────────────────────────────── */
.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.why-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.75rem;
  transition: border-color 0.2s;
}

.why-card:hover {
  border-color: var(--accent-dim);
}

.why-card h3 {
  font-size: 1rem;
  margin-bottom: 0.6rem;
  color: var(--accent);
}

.why-card p {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ── Screenshot Section ──────────────────────────────── */
.screenshot-section {
  text-align: center;
}

.screenshot-tabs {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-bottom: 0;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.screenshot-tab {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid #2a2f36;
  border-bottom: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.6rem 1.5rem;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}

.screenshot-tab:first-child {
  border-right: none;
}

.screenshot-tab.active {
  color: var(--accent);
  background: var(--code-bg);
}

.screenshot-tab:hover:not(.active) {
  color: var(--text);
}

.screenshot-wrapper {
  display: none;
  overflow: hidden;
  border: 1px solid #2a2f36;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  background: var(--code-bg);
}

.screenshot-wrapper.active {
  display: block;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  background: #1e2228;
  border-bottom: 1px solid #2a2f36;
}

.terminal-title {
  flex: 1;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #6b7785;
  margin-right: 52px;
}

.browser-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  background: #1e2228;
  border-bottom: 1px solid #2a2f36;
}

.browser-dots {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-close { background: #6b4040; }
.dot-min { background: #6b5c35; }
.dot-max { background: #3e6b40; }

.browser-url {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: #14181d;
  border: 1px solid #2a2f36;
  padding: 0.35rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #6b7785;
}

.lock-icon {
  flex-shrink: 0;
}

.screenshot-wrapper img {
  display: block;
  width: 100%;
}

/* ── Install Section (Tabs) ──────────────────────────── */
.install-tabs {
  max-width: 640px;
  margin: 0 auto;
}

.install-tab-bar {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.install-tab {
  flex: 1;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.75rem 1rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.install-tab:hover {
  color: var(--text);
}

.install-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.install-panel {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top: none;
  padding: 1.75rem;
}

.install-panel.active {
  display: block;
}

.install-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}

.install-panel pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.install-panel pre code {
  color: var(--text);
}

.install-panel .comment {
  color: var(--text-muted);
  opacity: 0.6;
}

/* ── Platforms ───────────────────────────────────────── */
.platforms {
  margin-top: 2rem;
  text-align: center;
}

.platforms-label {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.7;
}

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

.platform-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border: 1px solid var(--border);
  padding: 0.35rem 0.75rem;
}

.platform-item::before {
  content: "\2744";
  color: var(--accent);
  font-size: 1.1rem;
}

/* ── Usage Section ───────────────────────────────────── */
.usage-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.usage-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 2rem;
}

.usage-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.usage-card .subtitle {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}

.usage-card pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.usage-card ul {
  list-style: none;
  margin-top: 0.75rem;
}

.usage-card li {
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 0.25rem 0;
}

.usage-card li span {
  color: var(--accent);
}

/* ── CTA Section ─────────────────────────────────────── */
.cta-section {
  text-align: center;
  padding: 6rem 0;
}

.cta-section h2 {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.cta-section p {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

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

/* ── Footer ──────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
}

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

.footer-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer-left span {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.8rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--accent-hover);
}

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-portrait {
    width: 140px;
    height: 140px;
  }

  h2 {
    font-size: 1.5rem;
  }

  section {
    padding: 3.5rem 0;
  }

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

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

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

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-tagline {
    font-size: 0.9rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    padding: 0 1rem;
  }

  .btn {
    justify-content: center;
  }

  .install-banner {
    font-size: 0.75rem;
  }
}