/* ============================================================
   layout.css — 护妍 v4.0 「L'Atelier」 · 骨架
   全宽发丝线导航 · 编辑式容器 · 12 列栅格
   ============================================================ */

.l-app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* ---------- 顶部发丝线导航 ---------- */
.u-nav-wrap {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  pointer-events: none;
}

.u-nav {
  pointer-events: auto;
  height: var(--nav-h);
  max-width: 1520px;
  margin: 0 auto;
  padding: 0 var(--sp-10);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
  transition: height 0.4s var(--ease-soft), background-color 0.4s var(--ease-soft),
              backdrop-filter 0.4s var(--ease-soft), box-shadow 0.4s var(--ease-soft),
              transform 0.55s var(--ease-out);
  border-bottom: 1px solid transparent;
}

.u-nav.is-scrolled {
  height: var(--nav-h-scrolled);
  background: rgba(246, 241, 233, 0.62);
  backdrop-filter: blur(10px) saturate(120%);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
  border-bottom-color: var(--line-faint);
}

/* 下滑收起、上滑唤回 */
.u-nav.is-hidden { transform: translateY(-100%); }
body.k-open .u-nav { transform: none; }

/* 品牌字标 */
.u-nav__brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}
.u-nav__brand-zh {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: var(--ls-brand);
  color: var(--ink);
  transition: color var(--dur-micro) var(--ease-soft);
}
.u-nav__brand-en {
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--ls-caps);
  color: var(--gold-deep);
}
.u-nav__brand:hover .u-nav__brand-zh { color: var(--gold-deep); }

/* 纯文字导航 */
.u-nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-10);
}
.u-nav__link {
  position: relative;
  font-size: var(--fs-2xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--ls-caps);
  color: var(--ink-3);
  padding: 6px 0;
  transition: color var(--dur-ui) var(--ease-soft);
  text-decoration: none;
  white-space: nowrap;
}
.u-nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.45s var(--ease-out);
}
.u-nav__link:hover { color: var(--ink); }
.u-nav__link.is-active { color: var(--ink); }
.u-nav__link.is-active::after { transform: scaleX(1); }

/* 右侧元信息 */
.u-nav__meta {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  flex-shrink: 0;
}

/* 语言切换 —— 纯文字 */
.c-lang-toggle {
  display: flex;
  align-items: baseline;
  gap: 6px;
  cursor: pointer;
}
.c-lang-toggle__opt {
  font-size: var(--fs-2xs);
  letter-spacing: 0.14em;
  color: var(--ink-4);
  transition: color var(--dur-micro) var(--ease-soft);
  text-transform: uppercase;
}
.c-lang-toggle__opt.is-active { color: var(--ink); font-weight: 600; }
.c-lang-toggle__opt:hover { color: var(--gold-deep); }

/* 指令检索 —— 文字 + 键位 */
.u-nav__cmd {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 2px;
  cursor: pointer;
}
.u-nav__cmd-label {
  font-size: var(--fs-2xs);
  letter-spacing: var(--ls-caps-soft);
  text-transform: uppercase;
  color: var(--ink-3);
  transition: color var(--dur-micro) var(--ease-soft);
}
.u-nav__cmd:hover .u-nav__cmd-label { color: var(--gold-deep); }

/* 引擎状态 —— 一点 + 小字 */
.u-nav__health {
  display: flex;
  align-items: center;
  gap: 7px;
}
.u-nav__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--safe);
  box-shadow: 0 0 0 3px var(--safe-bg);
  transition: background var(--dur-ui) var(--ease-soft);
}
.u-nav__dot.is-offline { background: var(--warn); box-shadow: 0 0 0 3px var(--warn-bg); }
.u-nav__health-text {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ---------- 主画布 ---------- */
.l-deck {
  flex: 1;
  width: 100%;
  position: relative;
  z-index: var(--z-content);
}

.l-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--sp-10);
}

/* 视图切换 */
.v-view { display: none; }
.v-view.is-active { display: block; }

/* ---------- 12 列栅格 ---------- */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--sp-6);
}
.span-12 { grid-column: span 12; }
.span-8  { grid-column: span 8; }
.span-7  { grid-column: span 7; }
.span-6  { grid-column: span 6; }
.span-5  { grid-column: span 5; }
.span-4  { grid-column: span 4; }
.span-3  { grid-column: span 3; }

/* ---------- 响应式 ---------- */
@media (max-width: 1180px) {
  .u-nav { padding: 0 var(--sp-6); }
  .u-nav__links { gap: var(--sp-6); }
  .u-nav__health { display: none; }
}

@media (max-width: 960px) {
  .span-7, .span-5, .span-8, .span-4, .span-6, .span-3 { grid-column: span 12; }
  .u-nav { gap: var(--sp-4); }
  .u-nav__links { gap: var(--sp-4); overflow-x: auto; scrollbar-width: none; }
  .u-nav__links::-webkit-scrollbar { display: none; }
  .u-nav__cmd { display: none; }
  .l-container { padding: 0 var(--sp-5); }
}