:root {
  --background: #0b0d14;
  --foreground: #e2e8f0;
  --surface: #12151f;
  --surface-elevated: #1a1f2e;
  --border: #2a3144;
  --muted: #94a3b8;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --glow-blue: rgba(59, 130, 246, 0.15);
  --glow-purple: rgba(139, 92, 246, 0.12);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--background);
  color: var(--foreground);
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: rgba(139, 92, 246, 0.35);
  color: #fff;
}

a { color: inherit; text-decoration: none; }

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

.container {
  width: 100%;
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 640px) {
  .container { padding: 0 1.5rem; }
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(42, 49, 68, 0.6);
  background: rgba(11, 13, 20, 0.85);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  height: 4rem;
  align-items: center;
  justify-content: space-between;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.logo-link img {
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
}

.logo-text {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.logo-text span {
  margin-left: 0.375rem;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--muted);
}

.nav {
  display: none;
  align-items: center;
  gap: 0.25rem;
}

@media (min-width: 640px) {
  .nav { display: flex; }
}

.nav a {
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  color: var(--muted);
  transition: background 0.2s, color 0.2s;
}

.nav a:hover,
.nav a.active {
  background: var(--surface-elevated);
  color: var(--foreground);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  transition: opacity 0.2s, border-color 0.2s, background 0.2s;
}

.btn-primary {
  background: linear-gradient(to right, var(--accent-blue), var(--accent-purple));
  color: #fff;
  box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.2);
}

.btn-primary:hover { opacity: 0.9; }

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

.btn-secondary:hover {
  border-color: rgba(59, 130, 246, 0.4);
  background: var(--surface);
}

.btn-ghost {
  color: var(--muted);
}

.btn-ghost:hover {
  color: var(--foreground);
  background: var(--surface-elevated);
}

main { flex: 1; }

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--glow-blue), transparent),
    radial-gradient(ellipse 60% 40% at 80% 0%, var(--glow-purple), transparent);
}

.hero-inner {
  padding: 6rem 0;
}

@media (min-width: 640px) {
  .hero-inner { padding: 8rem 0; }
}

.hero-content {
  max-width: 48rem;
  margin: 0 auto;
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  margin-bottom: 1rem;
  padding: 0.375rem 1rem;
  border: 1px solid var(--border);
  border-radius: 9999px;
  background: rgba(18, 21, 31, 0.8);
  font-size: 0.75rem;
  color: var(--muted);
}

.badge-dot {
  display: inline-block;
  width: 0.375rem;
  height: 0.375rem;
  margin-right: 0.5rem;
  border-radius: 9999px;
  background: var(--accent-blue);
}

.hero h1 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

@media (min-width: 640px) {
  .hero h1 { font-size: 3.75rem; }
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  margin-top: 1.5rem;
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 640px) {
  .hero-desc { font-size: 1.25rem; }
}

.hero-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 2.5rem;
}

@media (min-width: 640px) {
  .hero-actions { flex-direction: row; }
}

/* Editor mockup */
.mockup {
  max-width: 56rem;
  margin: 4rem auto 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: 0 25px 50px -12px rgba(139, 92, 246, 0.1);
}

.mockup-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-elevated);
}

.dot { width: 0.75rem; height: 0.75rem; border-radius: 9999px; }
.dot-red { background: rgba(239, 68, 68, 0.7); }
.dot-yellow { background: rgba(234, 179, 8, 0.7); }
.dot-green { background: rgba(34, 197, 94, 0.7); }

.mockup-title {
  margin-left: 0.75rem;
  font-family: ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--muted);
}

.mockup-body {
  display: grid;
}

@media (min-width: 640px) {
  .mockup-body { grid-template-columns: 1fr 3fr 1fr; }
}

.mockup-sidebar {
  display: none;
  padding: 1rem;
  border-right: 1px solid var(--border);
  background: var(--background);
}

@media (min-width: 640px) {
  .mockup-sidebar { display: block; }
}

.mockup-sidebar div {
  font-family: ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.mockup-code {
  padding: 1rem;
  font-family: ui-monospace, monospace;
  font-size: 0.875rem;
  line-height: 1.7;
}

.mockup-code .kw { color: var(--accent-purple); }
.mockup-code .fn { color: var(--accent-blue); }
.mockup-code .muted { color: var(--muted); }
.mockup-code .str { color: rgba(74, 222, 128, 0.8); }

.mockup-chat {
  padding: 1rem;
  border-top: 1px solid var(--border);
  background: var(--surface-elevated);
}

@media (min-width: 640px) {
  .mockup-chat {
    border-top: none;
    border-left: 1px solid var(--border);
  }
}

.mockup-chat-label {
  margin-bottom: 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent-purple);
}

.mockup-chat p {
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--muted);
}

/* Sections */
.section {
  padding: 6rem 0;
}

.section-alt {
  border-top: 1px solid rgba(42, 49, 68, 0.6);
  background: rgba(18, 21, 31, 0.3);
}

.section-head {
  max-width: 42rem;
  margin: 0 auto;
  text-align: center;
}

.section-head h2 {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-head p {
  margin-top: 1rem;
  color: var(--muted);
}

.features {
  display: grid;
  gap: 1.5rem;
  margin-top: 4rem;
}

@media (min-width: 640px) {
  .features { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .features { grid-template-columns: repeat(3, 1fr); }
}

.card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: linear-gradient(180deg, rgba(26, 31, 46, 0.9) 0%, rgba(18, 21, 31, 0.95) 100%);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: 0 0 24px var(--glow-blue);
}

.card-icon {
  display: inline-flex;
  margin-bottom: 1rem;
  padding: 0.75rem;
  border-radius: 0.75rem;
  background: linear-gradient(to bottom right, rgba(59, 130, 246, 0.2), rgba(139, 92, 246, 0.2));
  color: var(--accent-blue);
}

.card-icon svg {
  width: 1.5rem;
  height: 1.5rem;
}

.card h3 {
  font-size: 1.125rem;
  font-weight: 600;
}

.card h3 span {
  margin-left: 0.5rem;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--muted);
}

.card p {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--muted);
}

.cta-box {
  position: relative;
  overflow: hidden;
  padding: 3rem;
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  background: linear-gradient(to bottom right, var(--surface-elevated), var(--surface));
  text-align: center;
}

.cta-box::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(59, 130, 246, 0.05), rgba(139, 92, 246, 0.05));
}

.cta-box-inner { position: relative; }

.cta-box h2 {
  font-size: 1.875rem;
  font-weight: 700;
}

.cta-box p {
  max-width: 36rem;
  margin: 1rem auto 0;
  color: var(--muted);
}

.cta-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

@media (min-width: 640px) {
  .cta-actions { flex-direction: row; }
}

/* Page */
.page-header {
  max-width: 42rem;
  margin: 0 auto;
  padding: 4rem 0 0;
  text-align: center;
}

.page-header h1 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-header p {
  margin-top: 1rem;
  font-size: 1.125rem;
  color: var(--muted);
}

.page-body {
  padding: 4rem 0 6rem;
}

/* Download cards */
.download-list {
  display: grid;
  gap: 1.5rem;
  max-width: 56rem;
  margin: 4rem auto 0;
}

.download-item {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: linear-gradient(180deg, rgba(26, 31, 46, 0.9) 0%, rgba(18, 21, 31, 0.95) 100%);
}

@media (min-width: 640px) {
  .download-item {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.download-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.platform-icon {
  padding: 0.75rem;
  border-radius: 0.75rem;
  background: var(--surface-elevated);
  color: var(--accent-blue);
}

.platform-icon svg {
  width: 2rem;
  height: 2rem;
}

.download-info h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

.download-info .arch {
  font-size: 0.875rem;
  color: var(--muted);
}

.download-info .filename {
  margin-top: 0.25rem;
  font-family: ui-monospace, monospace;
  font-size: 0.75rem;
  color: rgba(148, 163, 184, 0.7);
}

.download-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

@media (min-width: 640px) {
  .download-actions {
    width: auto;
    align-items: flex-end;
  }
}

.note-badge {
  padding: 0.625rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
  text-align: center;
  font-size: 0.875rem;
  color: var(--muted);
}

.build-box {
  max-width: 42rem;
  margin: 4rem auto 0;
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--surface);
}

.build-box h2 {
  font-size: 1.125rem;
  font-weight: 600;
}

.build-box > p {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}

pre {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--background);
  font-family: ui-monospace, monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--muted);
}

/* Docs */
.docs-layout {
  display: grid;
  gap: 3rem;
}

@media (min-width: 1024px) {
  .docs-layout {
    grid-template-columns: 220px 1fr;
  }
}

.docs-sidebar {
  display: none;
}

@media (min-width: 1024px) {
  .docs-sidebar {
    display: block;
  }

  .docs-sidebar nav {
    position: sticky;
    top: 6rem;
  }
}

.docs-sidebar p {
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

.docs-sidebar a {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.docs-sidebar a:hover {
  background: var(--surface-elevated);
  color: var(--foreground);
}

.prose h1 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.prose > p.lead {
  margin-top: 1rem;
  font-size: 1.125rem;
  color: var(--muted);
}

.prose section {
  margin-top: 2.5rem;
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.prose h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.prose p,
.prose li {
  margin-bottom: 1rem;
  line-height: 1.75;
  color: var(--muted);
}

.prose ol,
.prose ul {
  padding-left: 1.5rem;
}

.prose a {
  color: var(--accent-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.prose code {
  font-family: ui-monospace, monospace;
  font-size: 0.875em;
  padding: 0.125rem 0.375rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--surface-elevated);
  color: #c4b5fd;
}

.code-block {
  margin: 1rem 0 1.5rem;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--surface);
}

.code-block-title {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-elevated);
  font-size: 0.75rem;
  color: var(--muted);
}

.code-block pre {
  margin: 0;
  border: none;
  border-radius: 0;
  color: var(--foreground);
}

.prose table {
  width: 100%;
  margin-top: 1rem;
  font-size: 0.875rem;
  border-collapse: collapse;
}

.prose th,
.prose td {
  padding: 0.75rem 1rem 0.75rem 0;
  border-bottom: 1px solid rgba(42, 49, 68, 0.5);
  text-align: left;
  color: var(--muted);
}

.prose th { color: var(--muted); }

.prose td code { color: var(--accent-blue); }

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid rgba(42, 49, 68, 0.6);
  background: rgba(18, 21, 31, 0.5);
}

.footer-grid {
  display: grid;
  gap: 2rem;
  padding: 3rem 0;
}

@media (min-width: 640px) {
  .footer-grid { grid-template-columns: repeat(3, 1fr); }
}

.footer-grid h3,
.footer-brand {
  font-size: 1.125rem;
  font-weight: 600;
}

.footer-grid .sub {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.footer-grid .sub-en {
  margin-top: 0.25rem;
  font-size: 0.75rem;
  color: rgba(148, 163, 184, 0.7);
}

.footer-label {
  font-size: 0.875rem;
  font-weight: 500;
}

.footer-links {
  list-style: none;
  margin-top: 0.75rem;
}

.footer-links li { margin-bottom: 0.5rem; }

.footer-links a {
  font-size: 0.875rem;
  color: var(--muted);
}

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

.footer-mono {
  list-style: none;
  margin-top: 0.75rem;
  font-family: ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--muted);
}

.footer-mono li { margin-bottom: 0.5rem; }

.footer-mono .purple { color: var(--accent-purple); }
.footer-mono .blue { color: var(--accent-blue); }

.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 2rem 0;
  border-top: 1px solid rgba(42, 49, 68, 0.4);
  font-size: 0.75rem;
  color: var(--muted);
}

@media (min-width: 640px) {
  .footer-meta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.footer-meta code {
  color: var(--foreground);
}

.footer-company {
  padding: 2rem 0 3rem;
  border-top: 1px solid rgba(42, 49, 68, 0.4);
  font-size: 0.75rem;
  line-height: 1.8;
  color: rgba(148, 163, 184, 0.8);
}

.footer-company .brand {
  font-weight: 600;
  color: var(--muted);
}

.footer-company a:hover { color: var(--foreground); }