/* ============================================================
   layout.css — 页面结构：手机壳、顶栏、页面切换、底部导航、弹窗骨架
============================================================ */

/* ── 手机容器 ──────────────────────────────────────────────── */
.phone-shell {
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100dvh;
  background: rgba(8,10,20,0.75);
  backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
  border-left:  1px solid rgba(255,255,255,.04);
  border-right: 1px solid rgba(255,255,255,.04);
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
}

/* ── 顶部栏 ────────────────────────────────────────────────── */
.page-topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  padding: calc(14px + var(--safe-top)) 18px 12px;
  background: linear-gradient(180deg, rgba(10,14,26,.97), rgba(10,14,26,.70));
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  contain: layout style;
}
.page-topbar h1 { margin: 0; font-size: 18px; font-weight: 700; }
.page-topbar .subtitle { margin: 3px 0 0; color: var(--muted); font-size: 12px; }

/* ── 页面 / 路由 ──────────────────────────────────────────── */
.page {
  display: none;
  padding: 16px 16px calc(var(--nav-h) + var(--safe-bottom) + 14px);
  animation: page-in .25s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}
.page.active { display: block; }
.page.exiting {
  animation: page-out .2s ease forwards;
}

/* ── 底部导航 ──────────────────────────────────────────────── */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  height: calc(var(--nav-h) + var(--safe-bottom));
  display: flex;
  align-items: flex-start;
  padding-top: 8px;
  padding-bottom: var(--safe-bottom);
  background: linear-gradient(180deg, rgba(10,14,26,0), rgba(10,14,26,.97) 30%);
  backdrop-filter: blur(14px);
  border-top: 1px solid rgba(255,255,255,.04);
  z-index: 40;
}
.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  color: var(--muted);
  font-size: 10px;
  user-select: none;
  transition: color .18s, transform .1s;
  padding: 8px 0;
  margin: -8px 0;
}
.nav-item:active { transform: scale(0.92); }
.nav-item .nav-icon {
  font-size: 20px;
  line-height: 1;
  transition: transform .2s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.nav-item.active { color: var(--pink); }
.nav-item.active .nav-icon { transform: scale(1.1); }

/* ── 弹窗骨架 ──────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.65);
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal-sheet {
  width: 100%;
  max-width: 430px;
  background: #0f0f1e;
  border-radius: 28px 28px 0 0;
  padding: 24px 22px calc(36px + var(--safe-bottom));
  border-top: 1px solid rgba(255,255,255,.07);
  transform: translateY(40px);
  transition: transform .26s cubic-bezier(0.22, 1, 0.36, 1);
  max-height: 90vh;
  max-height: 90dvh;
  overflow-y: auto;
  will-change: transform;
}
.modal-overlay.open .modal-sheet { transform: translateY(0); }

.modal-handle {
  width: 36px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255,255,255,.12);
  margin: 0 auto 20px;
}

.modal-title { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.modal-sub   { font-size: 13px; color: var(--muted); margin-bottom: 22px; }
.modal-actions { display: flex; gap: 10px; margin-top: 6px; }
.modal-actions .btn { flex: 1; }