/* =========================================================
   Page frame — header, navigation, hero, footer
   Requires base.css
   ========================================================= */

/* ---------------------------------------------------------
   Header
   --------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 40;
  background: rgba(var(--page-bg-rgb), 0.72);
  border-bottom: 1px solid transparent;
  transition: background 220ms var(--ease), border-color 220ms var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--border-default);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  height: var(--header-h);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
  white-space: nowrap;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* The favicon already carries the brand mark — the isometric glass block that
   the hero and the intro use. This used to be an empty span filled with the
   gradient, so the header showed a plain coloured tile while every other
   surface showed the mark. Same asset, one request, already cached. */
.wordmark .wordmark-mark {
  width: 22px;
  height: 22px;
  flex: none;
  border-radius: 7px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.28);
}

.wordmark .wordmark-sub {
  color: var(--text-tertiary);
  font-size: 13px;
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ---------------------------------------------------------
   Navigation
   --------------------------------------------------------- */
.nav-desktop ul {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-desktop a {
  display: block;
  padding: 8px 14px;
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 14.5px;
  font-weight: 550;
  transition: color 180ms var(--ease), background 180ms var(--ease);
}

.nav-desktop a:hover,
.nav-desktop a.is-active {
  color: var(--primary-700);
  background: rgba(37, 99, 235, 0.06);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-default);
  border-radius: 12px;
  color: var(--primary-700);
  background: var(--surface-soft);
}

.nav-toggle .icon-close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-open {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

.mobile-nav {
  border-top: 1px solid var(--border-default);
  background: rgba(var(--surface-rgb), 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-block: var(--space-5);
}

.mobile-nav a {
  display: block;
  padding: 13px 12px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
}

.mobile-nav a:hover {
  background: var(--primary-50);
}

.mobile-nav .mobile-nav-cta {
  display: flex;
  gap: var(--space-3);
  padding-bottom: var(--space-6);
}

.mobile-nav .mobile-nav-cta .button {
  flex: 1;
}

/* ---------------------------------------------------------
   Hero
   --------------------------------------------------------- */
.hero {
  padding-top: calc(var(--header-h) + clamp(40px, 7vw, 88px));
  padding-bottom: clamp(40px, 5vw, 64px);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 5.5fr) minmax(0, 6.5fr);
  align-items: center;
  gap: clamp(32px, 5vw, 64px);
}

.hero-copy h1 {
  margin-top: var(--space-6);
  font-size: clamp(38px, 5.4vw, 56px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

/* 제목용 그라디언트는 배경 대비 3:1을 유지하도록 시안 끝단을 쓰지 않는다 */
.hero-copy h1 em {
  font-style: normal;
  background: var(--grad-head);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lede {
  max-width: 46ch;
  margin-top: var(--space-6);
  color: var(--text-secondary);
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-default);
  color: var(--text-tertiary);
  font-size: 13.5px;
  font-weight: 500;
}

.hero-meta li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero-meta li::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--primary-300);
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 420px;
}

.hero-visual .hero-orbit {
  position: absolute;
  inset: 8% 4%;
  border: 1px solid rgba(37, 99, 235, 0.09);
  border-radius: 50%;
  pointer-events: none;
}

.hero-visual .hero-orbit:nth-of-type(2) {
  inset: 20% 16%;
}

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
.site-footer {
  padding-block: var(--space-10) var(--space-8);
  border-top: 1px solid var(--border-default);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-8);
}

.footer-brand p {
  max-width: 34ch;
  margin-top: var(--space-3);
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
}

.footer-links h3 {
  margin-bottom: var(--space-3);
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* 터치 영역을 24px 이상으로 확보한다 (WCAG 2.5.8) */
.footer-links a {
  display: inline-block;
  padding-block: 4px;
  color: var(--text-secondary);
  font-size: 14.5px;
  transition: color 180ms var(--ease);
}

.footer-links a:hover {
  color: var(--primary-700);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-bottom {
  margin-top: var(--space-9);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-default);
  color: var(--text-tertiary);
  font-size: 13px;
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1023px) {
  :root {
    --header-h: 68px;
  }

  .nav-desktop {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

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

  /* 모바일에서는 텍스트가 먼저 읽히도록 비주얼을 위로 올리되 크기를 줄인다 */
  .hero-visual {
    order: -1;
    min-height: 0;
  }

  .hero-copy h1 {
    margin-top: var(--space-5);
  }
}

@media (max-width: 767px) {
  .wordmark .wordmark-sub {
    display: none;
  }

  .hero-actions .button {
    flex: 1 1 100%;
  }
}

@media (max-width: 639px) {
  .footer-links {
    gap: var(--space-6);
  }
}