:root {
  --bg: #000000;
  --bg-elevated: #0c0c0e;
  --surface: rgba(255, 255, 255, 0.045);
  --surface-strong: rgba(255, 255, 255, 0.07);
  --ink: #f5f5f7;
  --ink-muted: rgba(245, 245, 247, 0.68);
  --ink-faint: rgba(245, 245, 247, 0.42);
  --line: rgba(255, 255, 255, 0.1);
  --line-strong: rgba(255, 255, 255, 0.16);
  --amber: #ff9f0a;
  --amber-soft: rgba(255, 159, 10, 0.14);
  --amber-glow: rgba(255, 159, 10, 0.35);
  --danger: #ff3b30;
  --radius: 16px;
  --radius-sm: 12px;
  --max: 680px;
  --header-h: 4rem;
  --font-display: "Sora", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans", "Noto Sans KR", "Noto Sans JP", "Segoe UI", sans-serif;
  --shadow-soft: 0 24px 80px rgba(0, 0, 0, 0.55);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(255, 159, 10, 0.12), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(255, 59, 48, 0.06), transparent 50%),
    radial-gradient(ellipse 50% 30% at 0% 100%, rgba(255, 255, 255, 0.03), transparent 45%);
  background-attachment: fixed;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image: radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: linear-gradient(180deg, black 0%, transparent 85%);
}

a {
  color: var(--amber);
  text-underline-offset: 0.18em;
  transition: color 0.2s var(--ease);
}

a:hover {
  color: #ffc04d;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--header-h);
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
}

.header-inner {
  max-width: calc(var(--max) + 10rem);
  height: 100%;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.03em;
  transition: opacity 0.2s var(--ease);
}

.brand:hover {
  opacity: 0.88;
  color: var(--ink);
}

.brand-mark {
  position: relative;
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
}

.brand-mark::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    from 220deg,
    var(--amber) 0deg,
    var(--danger) 95deg,
    rgba(255, 255, 255, 0.08) 96deg,
    rgba(255, 255, 255, 0.08) 300deg,
    var(--amber) 360deg
  );
  box-shadow:
    0 0 0 2px var(--bg),
    0 0 20px var(--amber-glow);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: var(--bg-elevated);
}

.brand-text {
  font-size: 1.0625rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem;
  gap: 0.15rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.nav-links a {
  text-decoration: none;
  color: var(--ink-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  transition:
    color 0.2s var(--ease),
    background 0.2s var(--ease);
}

.nav-links a:hover {
  color: var(--ink);
  background: var(--surface-strong);
}

.nav-links a[aria-current="page"] {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

.lang-select {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.45rem 2.1rem 0.45rem 0.85rem;
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition:
    border-color 0.2s var(--ease),
    background 0.2s var(--ease);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' viewBox='0 0 12 12'%3E%3Cpath stroke='%23a1a1aa' stroke-width='1.5' stroke-linecap='round' d='M3 4.5 6 7.5 9 4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.65rem center;
}

.lang-select:hover,
.lang-select:focus-visible {
  border-color: var(--line-strong);
  background-color: var(--surface-strong);
  outline: none;
}

.page-shell {
  position: relative;
  z-index: 1;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 5rem;
}

.hero {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0 1rem;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  background: var(--amber-soft);
  color: var(--amber);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 8px var(--amber-glow);
}

h1 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.08;
  color: var(--ink);
}

.lede {
  margin: 0;
  color: var(--ink-muted);
  font-size: 1.125rem;
  line-height: 1.65;
  max-width: 36rem;
}

.meta {
  display: inline-flex;
  margin: 1.25rem 0 0;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  color: var(--ink-faint);
  font-size: 0.8125rem;
  background: var(--surface);
  border: 1px solid var(--line);
}

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

.prose section {
  margin: 0;
  padding: 1.5rem 1.5rem 1.35rem;
  background: linear-gradient(165deg, var(--surface-strong) 0%, var(--surface) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: border-color 0.25s var(--ease);
}

.prose section:hover {
  border-color: var(--line-strong);
}

.prose h2 {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.35;
  color: var(--ink);
}

.prose h2::before {
  content: "";
  flex-shrink: 0;
  width: 3px;
  margin-top: 0.35em;
  height: 1.1em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--amber), var(--danger));
}

.prose h3 {
  margin: 1.15rem 0 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ink);
}

.prose p,
.prose ul {
  margin: 0 0 0.8rem;
  color: var(--ink-muted);
  font-size: 0.9875rem;
}

.prose ul {
  padding-left: 1.15rem;
}

.prose li {
  margin-bottom: 0.4rem;
  padding-left: 0.15rem;
}

.prose li::marker {
  color: var(--amber);
}

.prose p:last-child,
.prose ul:last-child,
.prose section > :last-child {
  margin-bottom: 0;
}

.contact-card {
  background: linear-gradient(
    145deg,
    rgba(255, 159, 10, 0.1) 0%,
    var(--surface) 45%,
    var(--surface) 100%
  ) !important;
  border-color: rgba(255, 159, 10, 0.22) !important;
}

.contact-card h2::before {
  background: var(--amber);
}

.contact-box a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.35rem;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--ink);
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--line-strong);
  transition:
    border-color 0.2s var(--ease),
    background 0.2s var(--ease);
}

.contact-box a:hover {
  color: var(--amber);
  border-color: rgba(255, 159, 10, 0.4);
  background: rgba(255, 159, 10, 0.08);
}

.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  padding: 1.75rem 1.25rem 2.5rem;
  background: rgba(0, 0, 0, 0.5);
}

.footer-inner {
  max-width: calc(var(--max) + 10rem);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  justify-content: space-between;
  align-items: center;
  color: var(--ink-faint);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

.footer-links a {
  color: var(--ink-muted);
  text-decoration: none;
  font-size: 0.875rem;
}

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

/* —— Home —— */

.home {
  min-height: calc(100vh - var(--header-h) - 6rem);
  max-width: 920px;
  padding: clamp(2rem, 6vw, 4rem) 1.25rem 5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .home {
    grid-template-columns: auto 1fr;
    gap: 3rem 4rem;
  }
}

.home-visual {
  display: flex;
  justify-content: center;
  order: -1;
}

@media (min-width: 768px) {
  .home-visual {
    order: 0;
    justify-content: flex-end;
  }
}

.home-ring {
  position: relative;
  width: min(220px, 52vw);
  aspect-ratio: 1;
}

.home-ring svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 0 40px var(--amber-glow));
}

.home-ring-track {
  fill: none;
  stroke: rgba(255, 255, 255, 0.08);
  stroke-width: 2.5;
}

.home-ring-arc {
  fill: none;
  stroke: url(#ring-gradient);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 280 360;
  transform-origin: 60px 60px;
  animation: ring-spin 12s linear infinite;
}

@keyframes ring-spin {
  to {
    transform: rotate(360deg);
  }
}

.home-copy {
  max-width: 28rem;
}

.home h1 {
  font-size: clamp(2.5rem, 8vw, 3.5rem);
  margin-bottom: 1rem;
}

.home .lede {
  font-size: 1.1875rem;
}

.home-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.75rem;
}

.home-cards {
  display: grid;
  gap: 0.75rem;
  margin-top: 2rem;
  grid-column: 1 / -1;
}

@media (min-width: 768px) {
  .home-cards {
    grid-template-columns: 1fr 1fr;
  }
}

.panel-link {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.25rem 1.35rem;
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line);
  transition:
    transform 0.25s var(--ease),
    border-color 0.25s var(--ease),
    background 0.25s var(--ease);
}

.panel-link:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 159, 10, 0.35);
  background: var(--surface-strong);
  color: inherit;
}

.panel-kicker {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--amber);
}

.panel-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.panel-desc {
  font-size: 0.875rem;
  color: var(--ink-muted);
  line-height: 1.5;
}

.panel-arrow {
  margin-top: 0.5rem;
  font-size: 1.125rem;
  color: var(--ink-faint);
  transition: transform 0.25s var(--ease), color 0.25s var(--ease);
}

.panel-link:hover .panel-arrow {
  transform: translateX(4px);
  color: var(--amber);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.35rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9375rem;
  transition:
    transform 0.2s var(--ease),
    box-shadow 0.2s var(--ease),
    background 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

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

.btn-primary {
  color: #000;
  background: linear-gradient(180deg, #ffc04d 0%, var(--amber) 100%);
  box-shadow: 0 4px 24px var(--amber-glow);
}

.btn-primary:hover {
  color: #000;
  box-shadow: 0 8px 32px var(--amber-glow);
}

.btn-secondary {
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-strong);
}

.btn-secondary:hover {
  color: var(--ink);
  border-color: rgba(255, 255, 255, 0.28);
  background: var(--surface);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 640px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    min-height: var(--header-h);
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
  }

  .nav {
    width: 100%;
    justify-content: space-between;
  }

  .nav-links a {
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
  }

  .prose section {
    padding: 1.2rem 1.15rem;
  }

  main {
    padding-top: 1.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .home-ring-arc {
    animation: none;
  }

  .btn:hover,
  .panel-link:hover {
    transform: none;
  }
}