:root {
  --bg: #0e0e11;
  --panel: #131317;
  --card: #1a1a1f;
  --input: #232329;
  --input-focus: #2a2a31;
  --border: #2a2a31;
  --text: #f2f2f4;
  --muted: #9a9aa6;
  --accent: #14b8a6;
  --accent-strong: #0d9488;
  --accent-soft: rgba(20, 184, 166, 0.14);
  --danger: #f87171;
  --radius: 12px;
  --font: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }

/* ---------- 登录 ---------- */
.login-view {
  min-height: 100vh; display: grid; place-items: center;
  background:
    radial-gradient(600px 300px at 70% 10%, rgba(20, 184, 166, 0.18), transparent 60%),
    radial-gradient(500px 280px at 20% 90%, rgba(99, 102, 241, 0.16), transparent 60%),
    var(--bg);
  padding: 24px;
}
.login-box {
  width: 100%; max-width: 400px;
  background: var(--card); border: 1px solid var(--border); border-radius: 18px;
  padding: 38px 34px;
}
.login-brand { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.login-box h1 { font-size: 26px; font-weight: 700; }
.login-sub { color: var(--muted); font-size: 14px; margin: 8px 0 26px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 7px; }
.field label .req { color: var(--danger); }
.login-btn {
  width: 100%; padding: 12px; border: none; border-radius: 10px;
  background: var(--accent); color: #fff; font-size: 15px; font-weight: 600;
  transition: background .2s;
}
.login-btn:hover { background: var(--accent-strong); }
.login-error { color: var(--danger); font-size: 13px; margin-top: 12px; min-height: 18px; }
.login-back { display: block; text-align: center; color: var(--muted); font-size: 13px; margin-top: 20px; }
.login-back:hover { color: var(--accent); }

/* ---------- 布局 ---------- */
.app { display: flex; min-height: 100vh; }
.sidebar {
  width: 230px; flex: none;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh;
}
.side-brand {
  padding: 24px 22px 18px;
  font-size: 19px; font-weight: 800;
  border-bottom: 1px solid var(--border);
}
.side-user {
  margin: 16px 16px 8px; padding: 12px 14px;
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  font-size: 13px; color: var(--muted);
}
.side-user .u-name { color: var(--text); font-weight: 600; }
.side-nav { flex: 1; padding: 6px 14px; display: flex; flex-direction: column; gap: 4px; }
.side-nav a {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 14px; border-radius: 10px;
  color: var(--muted); font-size: 14px; font-weight: 500;
  transition: background .15s, color .15s;
}
.side-nav a svg { width: 18px; height: 18px; }
.side-nav a:hover { background: var(--input); color: var(--text); }
.side-nav a.active { background: var(--accent); color: #06201d; font-weight: 600; }
.side-foot { padding: 14px 16px 20px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 8px; }
.side-foot a, .side-foot button {
  font-size: 13px; color: var(--muted); background: none; border: none;
  text-align: left; padding: 8px 10px; border-radius: 8px;
}
.side-foot a:hover, .side-foot button:hover { background: var(--input); color: var(--text); }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 10;
  padding: 18px 30px;
  background: rgba(14, 14, 17, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.breadcrumb { font-size: 13px; color: var(--muted); }
.breadcrumb span.current { color: var(--text); }
.topbar-actions { display: flex; gap: 10px; align-items: center; }

.content { padding: 30px; max-width: 980px; width: 100%; }

.page-head { margin-bottom: 24px; }
.page-title { font-size: 26px; font-weight: 800; }
.page-sub { color: var(--muted); font-size: 14px; margin-top: 4px; }

/* ---------- 卡片与表单 ---------- */
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; margin-bottom: 22px;
}
.card-title { font-size: 16px; font-weight: 700; margin-bottom: 18px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-grid .full { grid-column: 1 / -1; }
.field textarea { min-height: 110px; resize: vertical; }
.input {
  width: 100%; padding: 11px 13px;
  background: var(--input); border: 1px solid transparent; border-radius: 8px;
  color: var(--text); font-size: 14px; transition: border .15s, background .15s;
}
.input:focus { outline: none; border-color: var(--accent); background: var(--input-focus); }
.input::placeholder { color: #63636d; }
textarea.input { line-height: 1.6; }

/* 头像上传 */
.avatar-row { display: flex; align-items: center; gap: 18px; }
.avatar-preview {
  width: 76px; height: 76px; border-radius: 14px; overflow: hidden;
  background: var(--input); flex: none; border: 1px solid var(--border);
}
.avatar-preview img { width: 100%; height: 100%; object-fit: cover; }
.avatar-actions { display: flex; flex-direction: column; gap: 8px; }
.avatar-hint { font-size: 12px; color: var(--muted); }
.btn-upload {
  padding: 8px 16px; border-radius: 8px; font-size: 13px; font-weight: 600;
  background: var(--accent-soft); color: var(--accent); border: 1px solid var(--accent);
}
.btn-remove { background: none; border: none; color: var(--muted); font-size: 13px; text-align: left; }
.btn-remove:hover { color: var(--danger); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 18px; border-radius: 9px; border: none;
  font-size: 14px; font-weight: 600; transition: background .15s;
}
.btn-primary { background: var(--accent); color: #06201d; }
.btn-primary:hover { background: var(--accent-strong); }
.btn-ghost { background: var(--input); color: var(--text); }
.btn-ghost:hover { background: var(--input-focus); }
.btn-danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
.btn-danger:hover { background: rgba(248, 113, 113, 0.12); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.form-actions { display: flex; gap: 12px; margin-top: 22px; align-items: center; }

/* ---------- 仪表盘 ---------- */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 18px; margin-bottom: 24px; }
.stat-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px;
}
.stat-num { font-size: 34px; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 13px; color: var(--muted); margin-top: 4px; }
.dash-links { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- 列表管理 ---------- */
.list-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.item-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 20px; margin-bottom: 14px;
}
.item-main { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; }
.item-title { font-size: 15px; font-weight: 700; }
.item-sub { font-size: 13px; color: var(--muted); margin-top: 4px; }
.item-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.item-tags span {
  font-size: 12px; color: var(--accent); background: var(--accent-soft);
  padding: 3px 10px; border-radius: 999px;
}
.item-actions { display: flex; gap: 8px; flex: none; }
.icon-btn {
  width: 34px; height: 34px; display: grid; place-items: center;
  background: var(--input); border: none; border-radius: 8px; color: var(--muted);
  transition: color .15s, background .15s;
}
.icon-btn svg { width: 16px; height: 16px; }
.icon-btn:hover { color: var(--text); background: var(--input-focus); }
.icon-btn.danger:hover { color: var(--danger); }
.empty { color: var(--muted); text-align: center; padding: 40px 0; font-size: 14px; }

/* ---------- 模态 ---------- */
.modal-mask {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(0, 0, 0, 0.6);
  display: flex; align-items: center; justify-content: center; padding: 24px;
}
.modal {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  width: 100%; max-width: 620px; max-height: 86vh; overflow: auto; padding: 28px;
}
.modal h3 { font-size: 18px; font-weight: 700; margin-bottom: 20px; }

/* ---------- 颜色选择 ---------- */
.color-presets { display: flex; gap: 10px; margin-top: 8px; flex-wrap: wrap; }
.color-dot {
  width: 30px; height: 30px; border-radius: 50%;
  border: 2px solid transparent; cursor: pointer; transition: transform .1s;
}
.color-dot:hover { transform: scale(1.1); }
.color-dot.active { border-color: #fff; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: #26262a; color: var(--text); border: 1px solid var(--border);
  padding: 12px 22px; border-radius: 10px; font-size: 14px;
  opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s; z-index: 200;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { border-color: var(--danger); color: var(--danger); }

/* ---------- 响应式 ---------- */
@media (max-width: 780px) {
  .sidebar { width: 72px; }
  .side-brand { font-size: 0; padding: 20px 0; text-align: center; }
  .side-brand::after { content: "后台"; font-size: 13px; }
  .side-user { display: none; }
  .side-nav a { justify-content: center; padding: 12px; }
  .side-nav a span { display: none; }
  .side-foot a, .side-foot button { text-align: center; }
  .form-grid { grid-template-columns: 1fr; }
  .content { padding: 18px; }
}