html, body { height: 100%; }
body { background: var(--bg-page); color: var(--text-primary); font-family: var(--font-sans); font-size: var(--fs-base); line-height: 1.5; }

  /* 登录页布局 */
.login-shell { min-height: 100vh; display: grid; grid-template-columns: 1.05fr 1fr; background: var(--brand-900); }
.login-aside { position: relative; display: flex; flex-direction: column; justify-content: space-between; padding: 56px 60px; color: #fff; overflow: hidden; background: radial-gradient(820px 520px at 14% -8%, rgba(199,132,118,0.55), transparent 58%), radial-gradient(760px 640px at 112% 118%, rgba(94,44,38,0.72), transparent 55%), linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 52%, var(--brand-800) 100%); }
.login-aside::after { content: ""; position: absolute; inset: 0; pointer-events: none; background-image: linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px); background-size: 38px 38px; -webkit-mask-image: radial-gradient(circle at 30% 30%, #000, transparent 75%); mask-image: radial-gradient(circle at 30% 30%, #000, transparent 75%); }
.login-aside .brand-row { display: flex; align-items: center; gap: 16px; position: relative; z-index: 1; }
.login-aside .emblem { width: 56px; height: 56px; border-radius: 12px; }
.login-aside .sys-name { font-family: var(--font-serif); font-size: 26px; font-weight: 600; letter-spacing: 1px; color: #fff; }
.login-aside .sys-en { font-size: 12px; color: rgba(255,255,255,0.7); letter-spacing: 2px; text-transform: uppercase; }
.login-aside .hero { position: relative; z-index: 1; max-width: 460px; }
.login-aside .hero h2 { font-family: var(--font-serif); font-size: 40px; font-weight: 600; line-height: 1.35; color: #fff; letter-spacing: 1px; }
.login-aside .hero p { margin-top: 18px; font-size: 15px; color: rgba(255,255,255,0.84); line-height: 1.9; }
.login-aside .tags { display: flex; gap: 10px; margin-top: 28px; flex-wrap: wrap; }
.login-aside .tags span { font-size: 12px; padding: 6px 14px; border: 1px solid rgba(255,255,255,0.32); border-radius: 999px; color: rgba(255,255,255,0.9); }
.login-aside .foot { position: relative; z-index: 1; font-size: 12px; color: rgba(255,255,255,0.62); line-height: 1.8; }
.login-main { display: grid; place-items: center; padding: 40px; background: var(--bg-page); }
.login-card { width: 100%; max-width: 396px; background: var(--bg-card); border-radius: var(--r-xl); padding: 40px 38px; box-shadow: var(--shadow-3); border: 1px solid var(--border); }
.login-card .title { font-family: var(--font-serif); font-size: 24px; font-weight: 600; color: var(--text-primary); letter-spacing: 0.5px; }
.login-card .desc { font-size: var(--fs-sm); color: var(--text-secondary); margin: 6px 0 var(--sp-5); }
.login-brand { display: flex; flex-direction: column; align-items: center; gap: var(--sp-3); margin-bottom: var(--sp-5); }
.login-brand img { width: 56px; height: 56px; border-radius: 50%; object-fit: cover; background: var(--bg-secondary); }
.login-brand .title { font-size: var(--fs-lg); font-weight: 500; color: var(--text-primary); }
.login-brand .sub { font-size: var(--fs-sm); color: var(--text-secondary); }
.login-tip { font-size: var(--fs-xs); color: var(--text-tertiary); margin-top: var(--sp-4); text-align: center; line-height: 1.7; }

  /* 工作台布局 */
.app-shell { display: grid; grid-template-columns: var(--sidebar-w) 1fr; grid-template-rows: var(--brand-bar-h) 1fr; grid-template-areas: "brand topbar" "side main"; min-height: 100vh; }
.brand-bar { grid-area: brand; display: flex; align-items: center; gap: var(--sp-3); padding: 0 var(--sp-4); border-bottom: 1px solid rgba(255,255,255,0.08); background: var(--brand); }
.brand-bar img.logo { width: 40px; height: 40px; border-radius: 50%; object-fit: cover; background: rgba(255,255,255,0.92); border: 2px solid rgba(255,255,255,0.18); box-shadow: 0 2px 6px rgba(0,0,0,0.08); }
.brand-bar .brand-text { display: flex; flex-direction: column; justify-content: center; line-height: 1.4; }
.brand-bar .school { font-size: var(--fs-md); color: #fff; font-weight: 600; letter-spacing: 0.3px; }
.brand-bar .class { font-size: var(--fs-xs); color: rgba(255,255,255,0.78); }

.top-bar { grid-area: topbar; display: flex; align-items: center; gap: var(--sp-3); padding: 0 var(--sp-5); border-bottom: 1px solid rgba(255,255,255,0.08); background: linear-gradient(180deg, var(--brand-dark) 0%, var(--brand-800) 100%); }
.top-bar .date { font-size: var(--fs-sm); color: rgba(255,255,255,0.92); font-weight: 500; letter-spacing: 0.3px; }
.top-bar .range { display: inline-flex; align-items: center; gap: 2px; background: rgba(0,0,0,0.14); border: 1px solid rgba(255,255,255,0.06); border-radius: var(--r-md); padding: 3px; }
.top-bar .range button { padding: 5px 13px; font-size: var(--fs-sm); border-radius: 8px; color: rgba(255,255,255,0.72); font-weight: 500; transition: all .15s; }
.top-bar .range button.active { background: rgba(255,255,255,0.2); color: #fff; box-shadow: 0 1px 3px rgba(0,0,0,0.12); }
.top-bar .spacer { flex: 1; }
.top-bar .user { display: flex; align-items: center; gap: var(--sp-2); font-size: var(--fs-sm); color: rgba(255,255,255,0.82); }
.top-bar .user .name { color: #fff; font-weight: 500; }
.top-bar .net { font-size: var(--fs-xs); padding: 4px 10px; border-radius: 999px; background: rgba(94,140,106,0.22); color: #BFE0C7; display: inline-flex; align-items: center; gap: 6px; }
.top-bar .net.offline { background: rgba(176,138,78,0.22); color: #E6CFA6; }
.top-bar .btn.ghost { border-color: rgba(255,255,255,0.14); color: rgba(255,255,255,0.82); }
.top-bar .btn.ghost:hover { background: rgba(255,255,255,0.1); color: #fff; border-color: rgba(255,255,255,0.22); }

.side-nav { grid-area: side; background: var(--bg-card); border-right: 1px solid var(--border); padding: var(--sp-3) var(--sp-2); overflow-y: auto; }
.side-nav .nav-item { display: flex; align-items: center; gap: var(--sp-3); padding: 10px var(--sp-3); border-radius: var(--r-sm); color: var(--text-secondary); cursor: pointer; user-select: none; font-size: var(--fs-base); }
.side-nav .nav-item:hover { background: var(--bg-secondary); color: var(--text-primary); }
.side-nav .nav-item.active { background: var(--brand-tint); color: var(--brand-dark); font-weight: 500; }
.side-nav .nav-item .icon { width: 18px; height: 18px; flex-shrink: 0; }
.side-nav .group { padding: var(--sp-2) var(--sp-3); font-size: var(--fs-xs); color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.5px; margin-top: var(--sp-3); }

.main { grid-area: main; overflow-y: auto; padding: var(--sp-5); }
.page-head { display: flex; align-items: center; gap: var(--sp-3); margin-bottom: var(--sp-4); flex-wrap: wrap; }
.page-head h1 { font-size: var(--fs-xl); font-weight: 600; margin: 0; font-family: var(--font-serif); letter-spacing: 0.5px; }
.page-head .crumb { font-size: var(--fs-sm); color: var(--text-secondary); margin-right: auto; }
.page-head .actions { display: flex; gap: var(--sp-2); }

  /* 移动端响应 */
@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; grid-template-rows: var(--brand-bar-h) var(--topbar-h) 1fr auto; grid-template-areas: "brand" "topbar" "main" "side"; }
  .top-bar { padding: 0 var(--sp-3); gap: var(--sp-2); }
  .side-nav { display: flex; flex-direction: row; overflow-x: auto; padding: var(--sp-2); border-right: none; border-top: 1px solid var(--border); -webkit-overflow-scrolling: touch; }
  .side-nav .group { display: none; }
  .side-nav .nav-item { white-space: nowrap; flex-shrink: 0; }
  .main { padding: var(--sp-3); }
  .top-bar { flex-wrap: wrap; gap: var(--sp-2); padding: 0 var(--sp-3); row-gap: 6px; }
  .top-bar .range { order: 3; }
  .login-shell { grid-template-columns: 1fr; }
  .login-aside { display: none; }
}

/* 小屏手机：导航只保留图标，顶栏更紧凑 */
@media (max-width: 560px) {
  .side-nav .nav-item span { display: none; }
  .side-nav .nav-item { flex-direction: column; gap: 2px; padding: 6px 10px; font-size: 11px; }
  .side-nav .nav-item .icon { width: 22px; height: 22px; }
  .brand-bar .brand-text .class { display: none; }
  .top-bar .date { font-size: var(--fs-xs); }
  .top-bar .user .text-ter { display: none; }
  .card { padding: var(--sp-3); }
  .table-scroll > table { min-width: 560px; }
}