/* ═══════════════════════════════════════════════════════════
   LANterm landing — warm glow on near-black charcoal
   Palette via CSS variables for easy retheme.
   ═══════════════════════════════════════════════════════════ */

:root {
  /* Surfaces */
  --bg: #0c0b0a;
  --bg-elevated: #141210;
  --bg-alt: #100e0c;
  --surface: #1a1714;
  --surface-hover: #221e19;
  --border: rgba(255, 180, 84, 0.12);
  --border-strong: rgba(255, 180, 84, 0.28);

  /* Amber accent glow */
  --amber: #ff8c42;
  --amber-bright: #ffb454;
  --amber-dim: #c45f1e;
  --amber-glow: rgba(255, 140, 66, 0.22);
  --amber-glow-soft: rgba(255, 180, 84, 0.1);

  /* Text */
  --text: #f2ebe3;
  --text-muted: #a89a8c;
  --text-dim: #6e6358;

  /* Terminal */
  --term-bg: #0a0908;
  --term-chrome: #161310;
  --term-you: #7dcea0;
  --term-peer-a: #6eb5ff;
  --term-peer-b: #e8a0ff;
  --term-sys: #6e6358;

  /* Type */
  --font-sans: "Space Grotesk", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  /* Layout */
  --container: 1120px;
  --header-h: 64px;
  --radius: 10px;
  --radius-lg: 14px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--amber-bright);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -100px;
  z-index: 1000;
  padding: 0.6rem 1rem;
  background: var(--amber);
  color: #1a1008;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
}

.skip-link:focus {
  top: 12px;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--amber-bright);
  background: rgba(255, 140, 66, 0.08);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

/* ── Logo ───────────────────────────────────────────────── */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text);
  text-decoration: none;
}

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

.logo-mark {
  color: var(--amber-bright);
  flex-shrink: 0;
}

.logo-wordmark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.logo-lan {
  color: var(--amber);
}

/* ── Header / Nav ───────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  background: transparent;
  transition:
    background 0.25s var(--ease),
    border-color 0.25s var(--ease),
    backdrop-filter 0.25s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(12, 11, 10, 0.78);
  border-bottom-color: var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 1rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav > a:not(.btn) {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.site-nav > a:not(.btn):hover {
  color: var(--text);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin-inline: auto;
  background: var(--text);
  transition: transform 0.2s var(--ease);
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.7rem 1.15rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease,
    transform 0.15s var(--ease);
}

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

.btn-primary {
  background: linear-gradient(180deg, var(--amber-bright), var(--amber));
  color: #1a1008;
  box-shadow: 0 0 0 1px rgba(255, 140, 66, 0.3), 0 8px 28px var(--amber-glow);
}

.btn-primary:hover {
  color: #1a1008;
  filter: brightness(1.06);
}

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

.btn-secondary:hover {
  color: var(--text);
  background: var(--surface);
  border-color: var(--amber-dim);
}

.btn-github {
  padding: 0.45rem 0.85rem;
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
  font-size: 0.875rem;
}

.btn-github:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--surface-hover);
}

.star-count {
  font-family: var(--font-mono);
  font-size: 0.8em;
  color: var(--text-muted);
  padding-left: 0.15rem;
}

/* ── Hero ───────────────────────────────────────────────── */
.hero {
  position: relative;
  padding: 3rem 0 5rem;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -10%;
  left: 50%;
  translate: -50% 0;
  width: min(900px, 140vw);
  height: 520px;
  background: radial-gradient(
    ellipse at center,
    rgba(255, 140, 66, 0.18) 0%,
    rgba(255, 180, 84, 0.06) 40%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
  animation: glow-pulse 8s ease-in-out infinite;
}

@keyframes glow-pulse {
  0%,
  100% {
    opacity: 0.85;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.04);
  }
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 900px) {
  .hero {
    padding: 4.5rem 0 6rem;
    min-height: calc(100vh - var(--header-h));
    display: flex;
    align-items: center;
  }

  .hero-grid {
    grid-template-columns: 1fr 1.05fr;
    gap: 3rem;
  }
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.15rem, 5.2vw, 3.35rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.035em;
  color: var(--text);
}

.hero-sub {
  margin: 0 0 1.75rem;
  max-width: 36ch;
  font-size: 1.1rem;
  color: var(--text-muted);
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ── Name breakdown (LAN + term) ────────────────────────── */
.name-breakdown {
  margin-top: 2rem;
  padding-top: 1.35rem;
  border-top: 1px solid var(--border);
  max-width: 30rem;
}

.name-breakdown-word {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 1.9rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 1rem;
}

.name-seg-lan {
  color: var(--amber);
}

.name-seg-term {
  color: var(--text-muted);
}

.name-legend {
  margin: 0;
  display: grid;
  gap: 0.5rem;
}

.name-legend-row {
  display: grid;
  grid-template-columns: 3.25rem 1fr;
  align-items: baseline;
  gap: 0.85rem;
}

.name-legend-key {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: right;
}

/* LAN → accent (matches wordmark); term → secondary foreground */
.name-key-lan {
  color: var(--amber);
}

.name-key-term {
  color: var(--text);
}

.name-legend-val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.name-breakdown-summary {
  margin: 1rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.reveal-on-scroll {
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity 0.55s var(--ease),
    transform 0.55s var(--ease);
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: none;
}

.footer-name-meaning {
  margin: 0.55rem 0 0;
  max-width: 22rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--text-dim);
}

/* ── Terminal demo ──────────────────────────────────────── */
.terminal {
  background: var(--term-bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.4),
    0 24px 60px rgba(0, 0, 0, 0.55),
    0 0 80px var(--amber-glow-soft);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.55;
}

.terminal-chrome {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1rem;
  background: var(--term-chrome);
  border-bottom: 1px solid var(--border);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  opacity: 0.7;
}

.dot-r {
  background: #ff5f57;
}
.dot-y {
  background: #febc2e;
}
.dot-g {
  background: #28c840;
}

.terminal-title {
  margin-left: 0.6rem;
  color: var(--text-dim);
  font-size: 0.75rem;
}

.terminal-body {
  padding: 1rem 1.1rem 1.15rem;
  min-height: 280px;
  display: flex;
  flex-direction: column;
}

.term-header {
  padding-bottom: 0.65rem;
  margin-bottom: 0.65rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

.term-accent {
  color: var(--amber-bright);
  font-weight: 600;
}

.term-lan {
  color: var(--amber);
}

.term-you {
  color: var(--term-you);
  font-weight: 500;
}

.term-dim {
  color: var(--term-sys);
}

.term-feed {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-height: 140px;
  margin-bottom: 0.85rem;
}

.term-line-sys {
  color: var(--term-sys);
  font-style: italic;
}

.term-line-chat .term-time {
  color: var(--term-sys);
}

.term-line-chat .term-name {
  font-weight: 600;
}

.term-name.peer-a {
  color: var(--term-peer-a);
}
.term-name.peer-b {
  color: var(--term-peer-b);
}
.term-name.you {
  color: var(--term-you);
}

.term-input {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--border);
  color: var(--text);
}

.term-prompt {
  color: var(--amber);
  font-weight: 600;
}

.cursor {
  display: inline-block;
  width: 0.55ch;
  height: 1.1em;
  margin-left: 1px;
  background: var(--amber);
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* ── Sections ───────────────────────────────────────────── */
.section {
  padding: 4.5rem 0;
}

.section-alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--border);
}

.section-head {
  margin-bottom: 2.5rem;
  max-width: 36rem;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(1.65rem, 3.2vw, 2.15rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

/* ── Feature grid ───────────────────────────────────────── */
.feature-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

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

@media (min-width: 960px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature {
  padding: 1.35rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition:
    border-color 0.2s ease,
    background 0.2s ease;
}

.feature:hover {
  border-color: var(--border-strong);
  background: var(--surface-hover);
}

.feature-icon {
  width: 28px;
  height: 28px;
  margin-bottom: 0.85rem;
  color: var(--amber);
}

.feature h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.feature p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ── Steps ──────────────────────────────────────────────── */
.steps {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  display: grid;
  gap: 1rem;
}

@media (min-width: 800px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
}

.step {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.35rem 1.25rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
}

.step-num {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--amber);
  letter-spacing: 0.06em;
}

.step h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.step p {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text-muted);
}

.firewall-note {
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--amber);
  background: rgba(255, 140, 66, 0.06);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.firewall-note strong {
  color: var(--amber-bright);
  font-weight: 600;
}

/* ── Code / install blocks ──────────────────────────────── */
.install-blocks {
  display: grid;
  gap: 1.25rem;
}

.os-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
  padding: 0.3rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: fit-content;
  max-width: 100%;
}

.os-tab {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.45rem 0.9rem;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: 7px;
  cursor: pointer;
  transition:
    background 0.15s ease,
    color 0.15s ease;
}

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

.os-tab.is-active {
  color: #1a1008;
  background: linear-gradient(180deg, var(--amber-bright), var(--amber));
}

.os-panel[hidden] {
  display: none;
}

.code-hint {
  margin: 0;
  padding: 0 1.15rem 1rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

.code-block {
  background: var(--term-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-block-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0.85rem;
  background: var(--term-chrome);
  border-bottom: 1px solid var(--border);
}

.code-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.btn-copy {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.3rem 0.65rem;
  color: var(--amber-bright);
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: 5px;
  cursor: pointer;
  transition:
    background 0.15s ease,
    color 0.15s ease;
}

.btn-copy:hover {
  background: rgba(255, 140, 66, 0.1);
}

.btn-copy.is-copied {
  color: var(--term-you);
  border-color: rgba(125, 206, 160, 0.4);
}

.code-block pre {
  margin: 0;
  padding: 1.1rem 1.15rem;
  overflow-x: auto;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--text);
  background: none;
  padding: 0;
  white-space: pre;
}

/* ── OSS CTA ────────────────────────────────────────────── */
.cta-section {
  position: relative;
  text-align: center;
  padding: 5rem 0;
  overflow: hidden;
}

.cta-inner {
  position: relative;
  z-index: 1;
  max-width: 40rem;
}

.cta-glow {
  position: absolute;
  inset: 20% 10%;
  background: radial-gradient(ellipse at center, var(--amber-glow) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
}

.cta-section h2 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.65rem, 3.2vw, 2.25rem);
  letter-spacing: -0.03em;
}

.cta-copy {
  margin: 0 auto 1.75rem;
  color: var(--text-muted);
  max-width: 38ch;
}

.cta-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

/* ── Footer ─────────────────────────────────────────────── */
.site-footer {
  padding: 2.5rem 0 3rem;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: space-between;
  align-items: flex-start;
}

.footer-tag {
  margin: 0.6rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer-meta {
  text-align: right;
}

.footer-meta p {
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

.footer-meta a:hover {
  color: var(--amber-bright);
}

.footer-small {
  font-size: 0.8rem !important;
  color: var(--text-dim) !important;
  max-width: 36ch;
  margin-left: auto;
}

/* ── Mobile nav ─────────────────────────────────────────── */
@media (max-width: 760px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.75rem 1rem 1rem;
    background: rgba(12, 11, 10, 0.96);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    display: none;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav > a:not(.btn) {
    padding: 0.75rem 0.5rem;
    border-bottom: 1px solid var(--border);
  }

  .site-nav .btn-github {
    margin-top: 0.75rem;
    justify-content: center;
  }

  .footer-meta {
    text-align: left;
  }

  .footer-small {
    margin-left: 0;
  }
}

/* ── Reduced motion ─────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-glow,
  .cursor {
    animation: none !important;
  }

  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}