/* yunji/css/layout.css — Structural layout: nav, hero, sections, footer, grid */

/* ══════════ Reset ══════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-page);
  color: var(--text-body);
  font-family: var(--ff-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; }

/* ══════════ Skip Link (a11y) ══════════ */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 999;
  padding: 8px 16px;
  background: var(--text-title);
  color: var(--bg-page);
  border-radius: var(--r-btn);
  font-size: 14px;
  font-weight: var(--fw-medium);
  transition: top 0.2s var(--ease-out);
}
.skip-link:focus {
  top: 8px;
}

/* ══════════ Nav ══════════ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding: 0 var(--nav-px);
  background: var(--bg-nav);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
  border-bottom: 1px solid var(--border-nav);
  transition: background 0.3s var(--ease-out);
}
.nav-logo {
  font-family: var(--ff-serif);
  font-size: 16px;
  font-weight: var(--fw-semibold);
  color: var(--text-title);
  letter-spacing: 6px;
  margin-right: auto;
  cursor: pointer;
}
.nav-pills {
  display: flex;
  gap: 4px;
  background: var(--bg-nav-pill);
  border-radius: var(--r-pill);
  padding: 3px;
}
.nav-pills a {
  color: var(--text-nav);
  font-size: 12px;
  font-weight: var(--fw-medium);
  padding: 5px 14px;
  border-radius: var(--r-pill);
  transition: color var(--dur-btn) var(--ease-out),
              background var(--dur-btn) var(--ease-out);
  cursor: pointer;
  white-space: nowrap;
}
.nav-pills a:hover,
.nav-pills a:focus-visible {
  color: var(--text-nav-hover);
  background: var(--bg-nav-pill-hover);
}
.nav-pills a.active {
  color: var(--text-nav-hover);
  background: var(--bg-nav-pill-hover);
}

/* ══════════ Hero ══════════ */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-h) + 32px) var(--section-px) 48px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 60% 40% at 50% 30%, rgba(180, 170, 150, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 40% 40% at 25% 65%, rgba(120, 160, 140, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse 40% 40% at 75% 60%, rgba(160, 130, 120, 0.05) 0%, transparent 50%);
}
.hero-title {
  font-family: var(--ff-serif);
  font-size: 72px;
  font-weight: var(--fw-light);
  color: var(--text-title);
  letter-spacing: 28px;
  position: relative;
  text-indent: 14px;
}
.hero-ensub {
  font-family: var(--ff-sans);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 10px;
  text-transform: uppercase;
  margin-top: 10px;
  position: relative;
  text-indent: 5px;
}
.hero-tagline {
  font-family: var(--ff-serif);
  font-weight: var(--fw-light);
  font-size: 15px;
  color: var(--text-sub);
  letter-spacing: 2px;
  margin-top: 24px;
  position: relative;
}

/* ══════════ Bento Container ══════════ */
.bento-wrap {
  max-width: var(--max-w);
  width: 100%;
  margin: 56px auto 0;
  position: relative;
}
.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--bento-gap);
}

/* ══════════ Scroll Cue ══════════ */
.scroll-cue {
  text-align: center;
  margin-top: 52px;
  position: relative;
}
.scroll-cue span {
  font-size: 11px;
  color: var(--text-ghost);
  letter-spacing: 4px;
  animation: drift 3s ease-in-out infinite;
  display: inline-block;
}
@keyframes drift {
  0%, 100% { transform: translateY(0); opacity: 0.3; }
  50% { transform: translateY(8px); opacity: 0.8; }
}

/* ══════════ Section Divider ══════════ */
.section-line {
  max-width: var(--max-w);
  margin: 0 auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-divider) 50%, transparent);
}

/* ══════════ Section ══════════ */
.sect {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--section-pt) var(--section-px) 40px;
}
.sect-head {
  display: flex;
  align-items: flex-end;
  gap: 20px;
  margin-bottom: var(--sect-head-mb);
}
.sect-idx {
  font-family: var(--ff-serif);
  font-size: 64px;
  font-weight: var(--fw-thin);
  line-height: 0.85;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.07), rgba(0, 0, 0, 0.015));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.sect-head h2 {
  font-family: var(--ff-serif);
  font-size: 26px;
  font-weight: var(--fw-medium);
  color: var(--text-title);
  letter-spacing: 4px;
}
.sect-head p {
  font-size: 13px;
  color: var(--text-aux);
  margin-top: 4px;
}

/* ══════════ Project Detail Row ══════════ */
.proj-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--proj-gap);
  align-items: center;
  margin-bottom: var(--proj-mb);
}
.proj-row.flip {
  direction: rtl;
}
.proj-row.flip > * {
  direction: ltr;
}

/* ══════════ Footer ══════════ */
.footer {
  text-align: center;
  padding: 80px var(--section-px) 60px;
  border-top: 1px solid var(--border-nav);
}
.footer-logo {
  font-family: var(--ff-serif);
  font-size: 14px;
  font-weight: var(--fw-medium);
  color: var(--text-muted);
  letter-spacing: 6px;
}
.footer-sub {
  font-size: 11px;
  color: var(--text-footer);
  margin-top: 8px;
}