:root {
  --bg: #0f1115;
  --card: #1a1d24;
  --card-hover: #1f232b;
  --border: #2a2f3a;
  --text: #e6e9ef;
  --muted: #8b93a7;
  --primary: #4f8cff;
  --primary-hover: #3a78f0;
  --primary-dim: rgba(79,140,255,.12);
  --danger: #ff5c5c;
  --ok: #22c55e;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}
a { color: var(--primary); text-decoration: none; }

/* ===== 通用 ===== */
.container { max-width: 880px; margin: 0 auto; padding: 24px 16px 48px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
input, button {
  font-family: inherit;
  font-size: 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 10px 14px;
  outline: none;
  transition: border-color .15s, background .15s;
}
input { background: var(--bg); color: var(--text); width: 100%; }
input:focus { border-color: var(--primary); }
input::placeholder { color: var(--muted); }
button {
  cursor: pointer;
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 18px;
  font-weight: 500;
  white-space: nowrap;
}
button:hover { background: var(--primary-hover); }
button:active { transform: translateY(1px); }
button.secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
button.secondary:hover { border-color: var(--primary); background: var(--primary-dim); }
button.danger { background: var(--danger); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.row { display: flex; gap: 10px; align-items: center; }
.field { margin-bottom: 14px; }
.field label { display: block; margin-bottom: 6px; color: var(--muted); font-size: 13px; }
.msg { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: 13px; }
.msg.error { background: rgba(255,92,92,.12); color: var(--danger); }
.msg.ok { background: rgba(34,197,94,.12); color: var(--ok); }
.hidden { display: none !important; }

/* ===== 顶栏（sticky） ===== */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
header h1 { font-size: 18px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
header h1::before {
  content: '';
  display: inline-block;
  width: 20px; height: 20px;
  background: var(--primary);
  border-radius: 5px;
  flex-shrink: 0;
}
header .user-info { color: var(--muted); font-size: 13px; }

/* ===== 搜索栏 ===== */
.search-card { margin-bottom: 20px; }
.search-card .row { gap: 8px; }
.search-card input { flex: 1; }
.search-actions { display: flex; gap: 8px; margin-top: 10px; }

/* ===== 邮件 ===== */
.mail-meta {
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
}
.mail-meta .meta-from { color: var(--text); font-weight: 500; }
.mail-meta .meta-attach { color: var(--primary); }
.mail-subject { font-size: 18px; font-weight: 600; margin-bottom: 10px; line-height: 1.4; }
.mail-body {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.mail-body iframe {
  width: 100%;
  min-height: 200px;
  border: none;
  background: #fff;
  display: block;
}
.mail-body pre {
  padding: 16px;
  white-space: pre-wrap;
  word-wrap: break-word;
  margin: 0;
  font-family: inherit;
  color: #333;
}
.mail-empty { text-align: center; color: var(--muted); padding: 48px 0; font-size: 14px; }

/* ===== 邮件列表 ===== */
.mail-list { list-style: none; }
.mail-list li {
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.mail-list li:hover {
  border-color: var(--primary);
  background: var(--card-hover);
}
.mail-list .li-subject { font-weight: 500; font-size: 14px; margin-bottom: 4px; }
.mail-list .li-meta { color: var(--muted); font-size: 12px; }
.mail-list .li-meta .li-from { color: var(--text); opacity: .7; }

/* ===== 返回按钮 ===== */
#back-to-list {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ===== Tabs ===== */
.tabs { display: flex; gap: 4px; margin-bottom: 16px; border-bottom: 1px solid var(--border); }
.tabs button {
  background: transparent;
  color: var(--muted);
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 10px 16px;
}
.tabs button.active { color: var(--text); border-bottom-color: var(--primary); }

/* ===== Spinner ===== */
.spinner {
  display: inline-block;
  width: 14px; height: 14px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .container { padding: 16px 12px 32px; }
  .card { padding: 16px; }
  .search-card .row { flex-direction: column; }
  .search-card .row button { width: 100%; }
  .search-actions { flex-wrap: wrap; }
  .mail-meta { font-size: 11px; gap: 4px 12px; }
  header h1 { font-size: 16px; }
  .modal { width: 92vw; margin: 20px auto; }
  .domain-add-row { flex-direction: column; }
  .domain-add-row button { width: 100%; }
}

/* ===== 域名管理弹窗 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  z-index: 100;
  padding-top: 60px;
}
.modal {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  width: 480px;
  max-width: 92vw;
  max-height: 80vh;
  overflow-y: auto;
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.modal-header h3 { font-size: 16px; font-weight: 600; }
.domain-add-row { display: flex; gap: 8px; margin-bottom: 8px; }
.domain-add-row input { flex: 1; }
.domain-suggest { margin-bottom: 16px; }
.domain-list { list-style: none; }
.domain-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 6px;
  font-size: 14px;
}
.domain-list li .domain-name { font-family: monospace; }
.domain-list li .domain-del {
  background: transparent;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 13px;
  padding: 4px 8px;
  border-radius: 4px;
}
.domain-list li .domain-del:hover { background: rgba(255,92,92,.15); }
.domain-empty { color: var(--muted); text-align: center; padding: 24px 0; font-size: 13px; }