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

:root {
  --bg: #0f1117;
  --card: #1a1d27;
  --border: #2a2d3a;
  --text: #e4e4e7;
  --text-dim: #8b8d97;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --green: #22c55e;
  --green-bg: rgba(34, 197, 94, 0.1);
  --yellow: #eab308;
  --yellow-bg: rgba(234, 179, 8, 0.1);
  --red: #ef4444;
  --red-bg: rgba(239, 68, 68, 0.1);
  --blue-bg: rgba(59, 130, 246, 0.1);
  --radius: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.page { display: none; }
.page.active { display: block; }

/* Auth Page */
.auth-container {
  max-width: 400px;
  margin: 100px auto;
  padding: 40px;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.auth-header { text-align: center; margin-bottom: 30px; }
.auth-header .logo { font-size: 48px; margin-bottom: 10px; }
.auth-header h1 { font-size: 24px; margin-bottom: 5px; }
.auth-header p { color: var(--text-dim); }
.auth-tabs { display: flex; gap: 0; margin-bottom: 20px; background: var(--bg); border-radius: 8px; padding: 3px; }
.tab-btn { flex: 1; padding: 10px; border: none; background: none; color: var(--text-dim); cursor: pointer; border-radius: 6px; font-size: 14px; transition: all 0.2s; }
.tab-btn.active { background: var(--primary); color: white; }
.auth-form { display: flex; flex-direction: column; gap: 12px; }
.auth-form input { padding: 12px 16px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; outline: none; transition: border 0.2s; }
.auth-form input:focus { border-color: var(--primary); }

/* Buttons */
.btn { padding: 10px 20px; border: none; border-radius: 8px; cursor: pointer; font-size: 14px; font-weight: 500; transition: all 0.2s; display: inline-flex; align-items: center; gap: 6px; }
.btn.primary { background: var(--primary); color: white; }
.btn.primary:hover { background: var(--primary-hover); }
.btn.outline { background: none; border: 1px solid var(--border); color: var(--text); }
.btn.outline:hover { border-color: var(--text-dim); }
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn.absent-btn { background: var(--yellow); color: #000; font-size: 16px; padding: 14px 28px; }
.btn.absent-btn:hover { filter: brightness(0.9); }
.btn.restore-btn { background: var(--green); color: #000; font-size: 16px; padding: 14px 28px; }
.btn.restore-btn:hover { filter: brightness(0.9); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Header */
.header { display: flex; justify-content: space-between; align-items: center; padding: 16px 24px; background: var(--card); border-bottom: 1px solid var(--border); }
.header-left { display: flex; align-items: center; gap: 10px; }
.header-left h2 { font-size: 18px; }
.logo-sm { font-size: 24px; }
.header-right { display: flex; align-items: center; gap: 12px; font-size: 14px; color: var(--text-dim); }

/* Stats */
.stats-bar { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; padding: 20px 24px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; text-align: center; }
.stat-card.online { border-color: var(--green); background: var(--green-bg); }
.stat-card.online .stat-number { color: var(--green); }
.stat-card.absent { border-color: var(--yellow); background: var(--yellow-bg); }
.stat-card.absent .stat-number { color: var(--yellow); }
.stat-card.pending { border-color: var(--primary); background: var(--blue-bg); }
.stat-card.pending .stat-number { color: var(--primary); }
.stat-card.offline { border-color: #6b7280; background: rgba(107, 114, 128, 0.1); }
.stat-card.offline .stat-number { color: #6b7280; }
.stat-number { font-size: 32px; font-weight: 700; }
.stat-label { font-size: 13px; color: var(--text-dim); margin-top: 4px; }

/* Action Bar */
.action-bar { display: flex; gap: 12px; padding: 0 24px 16px; align-items: center; }
.admin-only { display: none; }
.admin-visible .admin-only { display: block; }

/* Upload Area */
.upload-area { margin: 0 24px 16px; }
.upload-zone { border: 2px dashed var(--border); border-radius: var(--radius); padding: 40px; text-align: center; cursor: pointer; transition: all 0.2s; }
.upload-zone:hover, .upload-zone.drag-over { border-color: var(--primary); background: var(--blue-bg); }
.upload-icon { font-size: 48px; margin-bottom: 10px; }
.upload-link { color: var(--primary); cursor: pointer; }
.upload-hint { color: var(--text-dim); font-size: 12px; margin-top: 8px; }
.upload-preview { display: flex; align-items: center; gap: 16px; padding: 16px; background: var(--card); border-radius: var(--radius); border: 1px solid var(--border); }
.upload-preview img { max-height: 150px; border-radius: 8px; object-fit: contain; }
.upload-actions { display: flex; gap: 8px; }

/* Sections */
.section { padding: 0 24px 20px; }
.section h3 { font-size: 16px; margin-bottom: 12px; color: var(--text-dim); }

/* User Grid */
.user-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.user-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; display: flex; align-items: center; gap: 12px; transition: all 0.2s; }
.user-card.online { border-left: 3px solid var(--green); }
.user-card.absent { border-left: 3px solid var(--yellow); }
.user-card.pending { border-left: 3px solid var(--primary); }
.user-card.offline { border-left: 3px solid #6b7280; opacity: 0.6; }
.user-avatar { width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
.user-card.online .user-avatar { background: var(--green-bg); color: var(--green); }
.user-card.absent .user-avatar { background: var(--yellow-bg); color: var(--yellow); }
.user-card.pending .user-avatar { background: var(--blue-bg); color: var(--primary); }
.user-card.offline .user-avatar { background: rgba(107, 114, 128, 0.15); color: #6b7280; }
.user-info { flex: 1; min-width: 0; }
.user-name { font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-status { font-size: 12px; color: var(--text-dim); }
.user-time { font-size: 11px; color: var(--yellow); margin-top: 2px; }
.user-card .delete-btn { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 16px; padding: 4px; opacity: 0; transition: opacity 0.2s; }
.user-card:hover .delete-btn { opacity: 1; }
.user-card .delete-btn:hover { color: var(--red); }

/* Request List */
.request-list { display: flex; flex-direction: column; gap: 12px; }
.request-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.request-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.request-user { font-weight: 500; }
.request-time { font-size: 12px; color: var(--text-dim); }
.request-image { max-width: 300px; max-height: 200px; border-radius: 8px; margin-bottom: 10px; cursor: pointer; }
.request-actions { display: flex; gap: 8px; }
.btn.approve { background: var(--green); color: #000; }
.btn.reject { background: var(--red); color: white; }

/* Modal */
.modal { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.6); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal.hidden { display: none; }
.modal-content { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; width: 400px; max-width: 90vw; max-height: 85vh; display: flex; flex-direction: column; }
.modal-content h3 { margin-bottom: 16px; }
.modal-body { overflow-y: auto; flex: 1; min-height: 0; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; flex-shrink: 0; }
.modal-footer { flex-shrink: 0; margin-top: 12px; }
.modal-content input { width: 100%; padding: 10px 14px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; margin-bottom: 10px; outline: none; }
.modal-content input:focus { border-color: var(--primary); }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 8px; }

/* Toast */
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); padding: 12px 24px; border-radius: 8px; font-size: 14px; z-index: 200; animation: slideUp 0.3s ease; }
.toast.hidden { display: none; }
.toast.success { background: var(--green); color: #000; }
.toast.error { background: var(--red); color: white; }
.toast.info { background: var(--primary); color: white; }

@keyframes slideUp { from { opacity: 0; transform: translateX(-50%) translateY(20px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }

.hidden { display: none !important; }

/* Responsive */
@media (max-width: 600px) {
  .stats-bar { grid-template-columns: repeat(3, 1fr); }
  .user-grid { grid-template-columns: 1fr; }
  .upload-preview { flex-direction: column; }
}

/* Config Section */
.config-section { margin-bottom: 20px; }
.config-section label { font-weight: 500; margin-bottom: 8px; display: block; }
.config-row { display: flex; gap: 8px; align-items: center; }
.config-row input[type="number"] { width: 80px; padding: 8px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; }
.config-hint { font-size: 12px; color: var(--text-dim); margin-top: 4px; }
.admin-user-list { display: flex; flex-direction: column; gap: 8px; max-height: 200px; overflow-y: auto; }
.admin-user-item { display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; background: var(--bg); border-radius: 8px; }
.admin-user-item .user-actions { display: flex; gap: 4px; }
.admin-user-item .btn { padding: 4px 8px; font-size: 12px; }

/* Log Tooltip */
.log-tooltip { position: fixed; background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 14px; z-index: 100; min-width: 240px; max-width: 320px; box-shadow: 0 8px 24px rgba(0,0,0,0.3); pointer-events: none; }
.log-tooltip.hidden { display: none; }
.log-tooltip-title { font-weight: 600; margin-bottom: 8px; font-size: 14px; }
.log-tooltip-content { font-size: 12px; color: var(--text-dim); }
.log-item { display: flex; justify-content: space-between; padding: 4px 0; border-bottom: 1px solid var(--border); }
.log-item:last-child { border-bottom: none; }
.log-time { color: var(--text); }
.log-duration { color: var(--yellow); }
.log-summary { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border); font-weight: 500; color: var(--text); }

/* Profile */
.profile-section { display: flex; flex-direction: column; gap: 12px; }
.profile-item { display: flex; flex-direction: column; gap: 4px; }
.profile-item label { font-size: 13px; color: var(--text-dim); }
.profile-item input { padding: 8px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; }
.profile-item input:focus { border-color: var(--primary); outline: none; }
.input-disabled { background: var(--card) !important; color: var(--text-dim) !important; cursor: not-allowed; }
.info-value { padding: 8px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; }

/* Tabs */
.chat-tabs { display: flex; padding: 0 24px; background: var(--card); border-bottom: 1px solid var(--border); }
.chat-tab { padding: 10px 20px; border: none; background: none; color: var(--text-dim); cursor: pointer; font-size: 14px; border-bottom: 2px solid transparent; transition: all 0.2s; position: relative; }
.chat-tab.active { color: var(--text); border-bottom-color: var(--primary); }
.badge { background: var(--red); color: white; font-size: 11px; padding: 1px 6px; border-radius: 10px; margin-left: 4px; }
.badge.hidden { display: none; }
.tab-content { display: block; }
.tab-content.hidden { display: none; }

/* Chat Layout */
.chat-wrapper { width: 50%; height: 500px; display: flex; flex-direction: column; border-left: 1px solid var(--border); }
.chat-messages { flex: 1; overflow-y: auto; padding: 10px; display: flex; flex-direction: column; gap: 4px; }
.chat-header { padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--border); font-weight: 500; font-size: 14px; }

/* WeChat-style bubbles */
.msg-item { display: flex; align-items: flex-start; gap: 6px; max-width: 80%; }
.msg-item.mine { align-self: flex-end; flex-direction: row-reverse; }
.msg-item.other { align-self: flex-start; }
.msg-avatar { width: 32px; height: 32px; border-radius: 4px; background: var(--primary); color: white; display: flex; align-items: center; justify-content: center; font-size: 13px; flex-shrink: 0; }
.msg-item.other .msg-avatar { background: var(--border); color: var(--text); }
.msg-bubble { padding: 6px 10px; border-radius: 4px; font-size: 14px; line-height: 1.4; word-wrap: break-word; overflow-wrap: break-word; white-space: pre-wrap; }
.msg-item.mine .msg-bubble { background: var(--primary); color: white; }
.msg-item.other .msg-bubble { background: var(--card); border: 1px solid var(--border); color: var(--text); }
.msg-name { font-size: 11px; color: var(--text-dim); margin-bottom: 2px; }
.msg-time { font-size: 10px; color: var(--text-dim); margin-top: 2px; text-align: right; display: flex; align-items: center; justify-content: flex-end; gap: 6px; }
.msg-item.mine .msg-time { color: rgba(255,255,255,0.6); }
.msg-recall-btn { font-size: 11px; color: var(--red); cursor: pointer; opacity: 0; transition: opacity 0.2s; }
.msg-time:hover .msg-recall-btn { opacity: 1; }
.msg-recall-btn.show { opacity: 1; }

/* Chat Input */
.chat-input-area { display: flex; gap: 6px; padding: 10px 12px; background: var(--card); border-top: 1px solid var(--border); }
.chat-input-area input { flex: 1; padding: 8px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; color: var(--text); font-size: 14px; outline: none; }
.chat-input-area input:focus { border-color: var(--primary); }
.btn-send { padding: 8px 16px; }
.chat-img-btn { cursor: pointer; font-size: 18px; padding: 6px 8px; border-radius: 6px; transition: background 0.2s; }
.chat-img-btn:hover { background: var(--border); }
.emoji-picker { position: absolute; bottom: 100%; left: 0; background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 8px; display: grid; grid-template-columns: repeat(8, 1fr); gap: 4px; z-index: 20; box-shadow: 0 4px 12px rgba(0,0,0,0.3); max-width: 280px; }
.emoji-item { font-size: 20px; cursor: pointer; padding: 4px; border-radius: 4px; text-align: center; transition: background 0.15s; }
.emoji-item:hover { background: var(--border); }

/* Private Chat Layout */
.private-layout { display: flex; height: 540px; }
.chat-user-list { width: 200px; border-right: 1px solid var(--border); overflow-y: auto; flex-shrink: 0; }
.chat-user-item { padding: 10px 12px; cursor: pointer; border-bottom: 1px solid var(--border); transition: background 0.2s; display: flex; justify-content: space-between; align-items: center; }
.chat-user-item:hover { background: var(--card); }
.chat-user-item.active { background: var(--card); border-left: 3px solid var(--primary); }
.chat-user-name { font-size: 14px; font-weight: 500; }
.unread-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--red); flex-shrink: 0; }
.unread-dot.hidden { display: none; }
.unread-count { background: var(--red); color: white; font-size: 11px; padding: 1px 6px; border-radius: 10px; }
.unread-count.hidden { display: none; }

/* Avatar */
.avatar-sm { width: 32px; height: 32px; border-radius: 4px; object-fit: cover; flex-shrink: 0; }