/* ── 设计令牌 ── */
:root {
  --bg:            #f4f8fd;
  --card:          #ffffff;
  --fg:            #0d1f35;
  --fg-muted:      #5a7a9a;
  --border:        #d6e4f0;
  --accent:        #1478c8;
  --accent-2:      #2878dc;
  --accent-light:  rgba(20, 120, 200, 0.08);
  --accent-border: rgba(20, 120, 200, 0.25);
  --green:         #0d9a6e;
  --green-bg:      rgba(13, 154, 110, 0.08);
  --red:           #c64545;
  --red-bg:        rgba(198, 69, 69, 0.08);
  --shadow-xs:     0 1px 2px rgba(20, 80, 160, 0.06);
  --shadow-sm:     0 2px 8px rgba(20, 80, 160, 0.08);
  --shadow-md:     0 4px 20px rgba(20, 80, 160, 0.10);
  --radius-sm:     10px;
  --radius:        16px;
  --radius-lg:     20px;
  --font:          'Inter', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', monospace;
}

/* ── 基础 ── */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  color-scheme: light;
  font-size: 15px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  min-height: 100vh;
}

/* 背景淡色装饰 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 50% at 5% 15%,  rgba(20,120,200,.05) 0%, transparent 60%),
    radial-gradient(ellipse 60% 60% at 95% 85%,  rgba(40,120,220,.04) 0%, transparent 55%);
}

a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
button { cursor: pointer; }

/* ── 页面容器 ── */
.admin-page {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 36px 20px 64px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ── 顶部导航 ── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 24px;
  background: rgba(255,255,255,.75);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.topbar-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.topbar-kicker {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
}

.topbar-title {
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.1;
  color: var(--fg);
}

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

/* 顶栏按钮 */
.nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 16px;
  border-radius: 999px;
  font-size: .88rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background .15s, box-shadow .15s, color .15s;
  border: 1px solid transparent;
  text-decoration: none !important;
}

.nav-btn--outline {
  border-color: var(--border);
  background: #fff;
  color: var(--fg-muted);
}
.nav-btn--outline:hover {
  border-color: var(--accent-border);
  color: var(--accent);
  box-shadow: var(--shadow-xs);
}

.nav-btn--ghost {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent-border);
}
.nav-btn--ghost:hover {
  background: rgba(20,120,200,.14);
}

/* ── 全局消息条 ── */
.msg-bar {
  padding: 13px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: .92rem;
  animation: fadeIn .2s ease;
}
.msg-bar.hidden { display: none !important; }
.msg-bar[data-tone="success"] {
  border-color: rgba(13,154,110,.22);
  background: var(--green-bg);
  color: var(--green);
}
.msg-bar[data-tone="danger"] {
  border-color: rgba(198,69,69,.22);
  background: var(--red-bg);
  color: var(--red);
}
.msg-bar[data-tone="info"] {
  border-color: var(--accent-border);
  background: var(--accent-light);
  color: var(--accent);
}

/* ── 统计行 ── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.stat-card {
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  box-shadow: var(--shadow-xs);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

.stat-value {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -.04em;
  line-height: 1;
  color: var(--fg);
}
.stat-value--green { color: var(--green); }
.stat-value--red   { color: var(--red); }

/* ── 通用卡片 ── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 24px 0;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--fg);
}

.card-badge {
  font-size: .82rem;
  color: var(--fg-muted);
}

/* ── 创建用户表单 ── */
.create-form {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-fields {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-size: .85rem;
  font-weight: 600;
  color: var(--fg-muted);
}

.field-input {
  height: 40px;
  padding: 0 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--fg);
  font-size: .92rem;
  transition: border-color .15s, box-shadow .15s;
  outline: none;
}
.field-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(20,120,200,.12);
}
.field-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235a7a9a' stroke-width='2.5'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 34px;
}

.form-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 4px;
  border-top: 1px solid var(--border);
}

/* ── 按钮 ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  height: 38px;
  padding: 0 18px;
  border-radius: 999px;
  font-size: .88rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: opacity .15s, transform .15s, box-shadow .15s;
  cursor: pointer;
}
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 3px 12px rgba(20,120,200,.28);
}
.btn-primary:hover:not(:disabled) {
  box-shadow: 0 5px 18px rgba(20,120,200,.38);
}

.btn-sm {
  height: 32px;
  padding: 0 13px;
  font-size: .82rem;
  font-weight: 500;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--fg-muted);
  transition: border-color .15s, color .15s;
}
.btn-sm:hover:not(:disabled) {
  border-color: var(--accent-border);
  color: var(--accent);
}

/* ── 表格 ── */
.table-wrap {
  overflow-x: auto;
  margin-top: 16px;
}

.user-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 820px;
}

.user-table thead tr {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.user-table th {
  padding: 10px 18px;
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--fg-muted);
  text-align: left;
  white-space: nowrap;
}

.user-table td {
  padding: 14px 18px;
  font-size: .9rem;
  border-bottom: 1px solid rgba(214,228,240,.6);
  vertical-align: middle;
  color: var(--fg);
}

.user-table tbody tr:last-child td { border-bottom: 0; }

.user-table tbody tr:hover td {
  background: rgba(20,120,200,.025);
}

.table-empty {
  padding: 48px;
  text-align: center;
  color: var(--fg-muted);
  font-size: .92rem;
}

/* 角色徽章 */
.role-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 600;
}
.role-badge--admin {
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid var(--accent-border);
}
.role-badge--user {
  background: rgba(90,122,154,.08);
  color: var(--fg-muted);
  border: 1px solid rgba(90,122,154,.2);
}

/* 状态点 */
.status-dot {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .88rem;
}
.status-dot::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}
.status-dot--active { color: var(--green); }
.status-dot--active::before { background: var(--green); }
.status-dot--disabled { color: var(--red); }
.status-dot--disabled::before { background: var(--red); }

/* 当前用户标记 */
.self-label {
  font-size: .82rem;
  color: var(--fg-muted);
  font-style: italic;
}

/* ── 页脚 ── */
.page-footer {
  text-align: center;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--fg-muted);
  opacity: .6;
}

/* ── 动画 ── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.admin-page {
  animation: fadeIn .5s cubic-bezier(.16,1,.3,1);
}

/* ── 响应式 ── */
@media (max-width: 860px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .form-fields { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .admin-page { padding: 20px 14px 48px; }
  .topbar { flex-direction: column; align-items: flex-start; }
  .stats-row { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .form-fields { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}