/* ========== 后台管理系统 - 炫酷深色主题 ========== */
:root {
  --bg: #070b14;
  --sidebar: #0c1222;
  --panel: rgba(15, 23, 42, 0.72);
  --panel-border: rgba(99, 102, 241, 0.18);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.45);
  --accent: #22d3ee;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --sidebar-w: 260px;
  --header-h: 64px;
  --radius: 14px;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

body.admin-body {
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(99, 102, 241, 0.22), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(34, 211, 238, 0.12), transparent),
    var(--bg);
}

/* ===== 登录页 ===== */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: #050810;
}

.login-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.25) 0%, transparent 45%),
    radial-gradient(circle at 80% 20%, rgba(34, 211, 238, 0.18) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(168, 85, 247, 0.08) 0%, transparent 60%);
}

.login-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(99, 102, 241, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
}

.login-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  animation: float 8s ease-in-out infinite;
}
.login-orb-1 { width: 320px; height: 320px; background: rgba(99, 102, 241, 0.35); top: -80px; left: -80px; }
.login-orb-2 { width: 280px; height: 280px; background: rgba(34, 211, 238, 0.25); bottom: -60px; right: -60px; animation-delay: -4s; }

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(20px, -20px) scale(1.05); }
}

.login-card {
  position: relative;
  z-index: 2;
  width: 420px;
  padding: 42px 40px;
  border-radius: 24px;
  background: rgba(12, 18, 34, 0.75);
  border: 1px solid rgba(99, 102, 241, 0.25);
  backdrop-filter: blur(20px);
  box-shadow: 0 0 60px rgba(99, 102, 241, 0.15), var(--shadow);
}

.login-logo {
  text-align: center;
  margin-bottom: 32px;
}
.login-logo .icon {
  width: 64px; height: 64px; margin: 0 auto 16px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 28px;
  box-shadow: 0 8px 32px var(--primary-glow);
}
.login-logo h1 {
  font-size: 24px;
  background: linear-gradient(90deg, #fff, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.login-logo p { color: var(--muted); font-size: 13px; margin-top: 8px; }

.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 13px; color: var(--muted); margin-bottom: 8px;
}
.form-input {
  width: 100%; padding: 14px 16px;
  background: rgba(7, 11, 20, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 12px; color: var(--text); font-size: 14px;
  transition: all .25s;
}
.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2), 0 0 20px rgba(99, 102, 241, 0.15);
}

.btn-launch {
  width: 100%; padding: 14px; margin-top: 8px;
  border: none; border-radius: 12px; cursor: pointer;
  font-size: 15px; font-weight: 600; color: #fff;
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #22d3ee 100%);
  background-size: 200% auto;
  box-shadow: 0 8px 28px var(--primary-glow);
  transition: all .3s;
  position: relative; overflow: hidden;
}
.btn-launch:hover {
  background-position: right center;
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(99, 102, 241, 0.5);
}
.btn-launch:active { transform: translateY(0); }
.btn-launch.loading { opacity: .7; pointer-events: none; }

.form-error {
  color: var(--danger); font-size: 13px; text-align: center;
  min-height: 20px; margin-top: 12px;
}

/* ===== 后台布局 ===== */
.admin-layout { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  background: linear-gradient(180deg, rgba(12, 18, 34, 0.98) 0%, rgba(7, 11, 20, 0.98) 100%);
  border-right: 1px solid var(--panel-border);
  display: flex; flex-direction: column;
  position: fixed; top: 0; left: 0; bottom: 0; z-index: 100;
  backdrop-filter: blur(12px);
}

.sidebar-brand {
  padding: 22px 20px;
  border-bottom: 1px solid var(--panel-border);
  display: flex; align-items: center; gap: 12px;
}
.sidebar-brand .logo-icon {
  width: 40px; height: 40px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; box-shadow: 0 4px 16px var(--primary-glow);
}
.sidebar-brand .title { font-size: 16px; font-weight: 700; }
.sidebar-brand .sub { font-size: 11px; color: var(--muted); margin-top: 2px; }

.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }

.nav-group { margin-bottom: 8px; }
.nav-group-title {
  font-size: 11px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--muted); padding: 8px 12px 6px;
}

.nav-tree-item { margin-bottom: 2px; }

.nav-link {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px; border-radius: 10px;
  color: var(--muted); text-decoration: none; font-size: 14px;
  transition: all .2s; cursor: pointer; border: 1px solid transparent;
}
.nav-link:hover {
  color: var(--text);
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.12);
}
.nav-link.active {
  color: #fff;
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.25), rgba(34, 211, 238, 0.08));
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.12);
}
.nav-link .icon { width: 20px; text-align: center; font-size: 16px; }

.nav-children {
  margin-left: 12px; padding-left: 12px;
  border-left: 1px solid rgba(99, 102, 241, 0.15);
  max-height: 0; overflow: hidden;
  transition: max-height .3s ease;
}
.nav-group.open .nav-children { max-height: 200px; }
.nav-children .nav-link { padding: 9px 12px; font-size: 13px; }

.nav-toggle {
  margin-left: auto; font-size: 10px; transition: transform .2s;
}
.nav-group.open .nav-toggle { transform: rotate(90deg); }

.sidebar-footer {
  padding: 16px; border-top: 1px solid var(--panel-border);
}
.user-card {
  display: flex; align-items: center; gap: 10px;
  padding: 10px; border-radius: 10px;
  background: rgba(99, 102, 241, 0.06);
}
.user-avatar {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), #a855f7);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 14px;
}
.user-name { font-size: 13px; font-weight: 600; }
.user-role { font-size: 11px; color: var(--muted); }

.main-wrap {
  flex: 1; margin-left: var(--sidebar-w);
  display: flex; flex-direction: column; min-height: 100vh;
}

.topbar {
  height: var(--header-h);
  padding: 0 28px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--panel-border);
  background: rgba(12, 18, 34, 0.6);
  backdrop-filter: blur(10px);
  position: sticky; top: 0; z-index: 50;
}
.page-title { font-size: 18px; font-weight: 600; }
.breadcrumb { font-size: 12px; color: var(--muted); margin-top: 4px; }

.topbar-actions { display: flex; gap: 10px; align-items: center; }

.main-content { padding: 28px; flex: 1; }

/* ===== 卡片 / 统计 ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px; margin-bottom: 28px;
}
.stat-card {
  padding: 22px; border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(8px);
  position: relative; overflow: hidden;
  transition: transform .2s, box-shadow .2s;
}
.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.12);
}
.stat-card::after {
  content: ''; position: absolute; top: 0; right: 0;
  width: 80px; height: 80px; border-radius: 50%;
  background: radial-gradient(circle, var(--primary-glow), transparent 70%);
  opacity: .4; transform: translate(30%, -30%);
}
.stat-label { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.stat-value { font-size: 32px; font-weight: 700; }
.stat-value.primary { color: var(--accent); }
.stat-value.success { color: var(--success); }
.stat-value.warning { color: var(--warning); }
.stat-value.danger { color: var(--danger); }

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  overflow: hidden;
}
.panel-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--panel-border);
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
}
.panel-header h3 { font-size: 15px; font-weight: 600; }
.panel-body { padding: 0; }
.panel-body.padded { padding: 22px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 16px; border: none; border-radius: 10px;
  cursor: pointer; font-size: 13px; font-weight: 500;
  transition: all .2s; text-decoration: none; color: #fff;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  box-shadow: 0 4px 16px var(--primary-glow);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px var(--primary-glow); }
.btn-ghost {
  background: rgba(148, 163, 184, 0.1);
  border: 1px solid rgba(148, 163, 184, 0.15);
  color: var(--text);
}
.btn-ghost:hover { background: rgba(148, 163, 184, 0.18); }
.btn-success { background: var(--success); }
.btn-danger { background: var(--danger); }
.btn-sm { padding: 6px 12px; font-size: 12px; border-radius: 8px; }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* ===== 表格 ===== */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
  padding: 14px 16px; text-align: left;
  font-size: 12px; font-weight: 600; color: var(--muted);
  background: rgba(99, 102, 241, 0.06);
  border-bottom: 1px solid var(--panel-border);
  text-transform: uppercase; letter-spacing: .5px;
}
.data-table td {
  padding: 14px 16px; font-size: 13px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.06);
}
.data-table tr:hover td { background: rgba(99, 102, 241, 0.04); }
.data-table tr:last-child td { border-bottom: none; }

.badge {
  display: inline-block; padding: 4px 10px; border-radius: 20px;
  font-size: 11px; font-weight: 600;
}
.badge-success { background: rgba(34, 197, 94, 0.15); color: var(--success); }
.badge-danger { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.badge-info { background: rgba(34, 211, 238, 0.12); color: var(--accent); }

/* ===== 弹窗 ===== */
.modal-overlay {
  display: none; position: fixed; inset: 0; z-index: 200;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  align-items: center; justify-content: center;
}
.modal-overlay.show { display: flex; }
.modal-box {
  width: 460px; max-width: 92vw;
  background: linear-gradient(180deg, #121a2e, #0c1222);
  border: 1px solid var(--panel-border);
  border-radius: 18px; padding: 28px;
  box-shadow: 0 0 60px rgba(99, 102, 241, 0.2);
  animation: modalIn .25s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-box h3 { margin-bottom: 20px; font-size: 17px; }
.modal-footer { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; }

/* ===== Toast ===== */
.toast {
  position: fixed; top: 80px; right: 28px; z-index: 300;
  padding: 14px 20px; border-radius: 12px;
  background: rgba(12, 18, 34, 0.95);
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
  animation: slideIn .3s ease;
  display: none;
}
.toast.show { display: block; }
.toast.success { border-color: rgba(34, 197, 94, 0.4); }
.toast.error { border-color: rgba(239, 68, 68, 0.4); }
@keyframes slideIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

.empty-state {
  text-align: center; padding: 60px 20px; color: var(--muted);
}
.empty-state .icon { font-size: 48px; margin-bottom: 16px; opacity: .5; }

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .main-wrap { margin-left: 0; }
}