/* 后台外壳：侧栏 + 顶栏 + 内容（浅色系） */
.admin-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 248px;
  flex-shrink: 0;
  background: #ffffff;
  border-right: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 20;
}
.brand {
  padding: 22px 22px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--hairline);
}
.brand-mark {
  width: 38px; height: 38px;
  border-radius: 11px;
  background: var(--grad-accent);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; color: #ffffff; font-size: 18px;
  box-shadow: 0 2px 8px rgba(45,71,57,0.28);
  flex-shrink: 0;
}
.brand-name { font-size: 16px; font-weight: 600; color: var(--text-strong); letter-spacing: 0.3px; }
.brand-sub { font-size: 11px; color: var(--muted-2); letter-spacing: 1.5px; text-transform: uppercase; }

.nav { padding: 14px 12px; flex: 1; }
.nav-section { font-size: 11px; color: var(--muted-2); text-transform: uppercase; letter-spacing: 1.2px; padding: 14px 12px 6px; }
.nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  transition: all .16s ease;
  cursor: pointer;
  margin-bottom: 2px;
}
.nav-item:hover { background: rgba(45,71,57,0.06); color: var(--text); }
.nav-item.active {
  background: var(--grad-accent-soft);
  color: var(--text-strong);
  border: 1px solid var(--hairline);
}
.nav-item .nav-ico { width: 18px; height: 18px; flex-shrink: 0; opacity: 0.9; }

.sidebar-foot { padding: 14px 16px; border-top: 1px solid var(--hairline); font-size: 12px; color: var(--muted-2); }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; background: var(--bg-0); }

.topbar {
  position: sticky; top: 0; z-index: 10;
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--sp-5);
  background: #ffffff;
  border-bottom: 1px solid var(--hairline);
  box-shadow: var(--shadow-sm);
}
.topbar h1 { font-size: 18px; }
.topbar .user { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--muted); }
.topbar .avatar { width: 32px; height: 32px; border-radius: 9px; background: var(--grad-accent); display:flex; align-items:center; justify-content:center; color:#fff; font-weight:600; font-size: 13px; }
.menu-toggle { display: none; background: transparent; border: 1px solid var(--hairline); color: var(--text); border-radius: 9px; padding: 7px 10px; cursor: pointer; }

.content { padding: var(--sp-5); flex: 1; }
.page-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--sp-5); gap: 16px; flex-wrap: wrap; }
.page-head h2 { font-size: 22px; }
.page-head .sub { color: var(--muted); font-size: 13px; margin-top: 4px; }

/* 表单页 */
.form-card { max-width: 860px; }
.form-actions { display: flex; gap: 12px; margin-top: var(--sp-5); }

/* 价格编辑行 */
.price-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr 0.8fr 1fr auto;
  gap: 12px;
  align-items: end;
  padding: 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  background: #fff;
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
}
.price-row .field { margin-bottom: 0; }
.price-row .plan-name { font-size: 15px; color: var(--text-strong); font-weight: 600; }
.price-row .plan-cycle { font-size: 12px; color: var(--muted); }
@media (max-width: 768px) {
  .price-row { grid-template-columns: 1fr 1fr; }
  .price-row .plan-cell { grid-column: 1 / -1; }
}

/* 登录页 */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
.login-card { width: 100%; max-width: 420px; padding: 40px 36px; background: #fff; border-radius: var(--r-lg); box-shadow: var(--shadow-md); border: 1px solid var(--hairline); }
.login-logo { width: 56px; height: 56px; border-radius: 16px; background: var(--grad-accent); display:flex; align-items:center; justify-content:center; font-weight:700; color:#fff; font-size: 26px; margin: 0 auto 20px; box-shadow: 0 4px 14px rgba(45,71,57,0.3); }
.login-title { text-align: center; font-size: 22px; margin-bottom: 6px; }
.login-sub { text-align: center; color: var(--muted); font-size: 13px; margin-bottom: 28px; }
.login-cred { margin-top: 22px; padding: 14px; border-radius: var(--r-md); background: rgba(45,71,57,0.04); border: 1px solid rgba(45,71,57,0.18); font-size: 12.5px; color: var(--muted); }
.login-cred code { color: var(--cyan); font-family: var(--mono); }

/* 空状态 */
.empty-state { text-align: center; padding: 60px 20px; color: var(--muted); }
.empty-state .ico { font-size: 36px; margin-bottom: 12px; opacity: 0.4; }

/* 响应式侧栏 */
@media (max-width: 900px) {
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0;
    transform: translateX(-100%);
    transition: transform .25s ease;
    box-shadow: var(--shadow-md);
  }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: inline-flex; }
  .content { padding: var(--sp-4); }
  .topbar { padding: 0 var(--sp-4); }
}
.sidebar-backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.3); z-index: 19; }
.sidebar-backdrop.show { display: block; }