* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background: #f5f7fa; color: #333; line-height: 1.6; -webkit-text-size-adjust: 100%; }
a { color: #4a90d9; text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 960px; margin: 0 auto; padding: 0 16px; min-height: 100vh; display: -webkit-box; display: -webkit-flex; display: flex; -webkit-box-orient: vertical; -webkit-flex-direction: column; flex-direction: column; }

/* Header */
.site-header { display: -webkit-box; display: -webkit-flex; display: flex; -webkit-box-pack: justify; -webkit-justify-content: space-between; justify-content: space-between; -webkit-box-align: center; -webkit-align-items: center; align-items: center; padding: 16px 0; border-bottom: 1px solid #e8e8e8; }
.site-header .logo a { font-size: 20px; font-weight: 700; color: #333; }
.site-header .nav a { margin-left: 20px; color: #666; font-size: 14px; }
.site-header .nav a.active, .site-header .nav a:hover { color: #4a90d9; }

/* Main */
.main { -webkit-box-flex: 1; -webkit-flex: 1; flex: 1; padding: 24px 0; }

/* Hero */
.hero { text-align: center; margin-bottom: 24px; }
.hero h1 { font-size: 28px; margin-bottom: 8px; color: #222; }
.hero .subtitle { color: #888; font-size: 14px; }

/* Search */
.search-box { margin-bottom: 24px; }
.search-box form { display: -webkit-box; display: -webkit-flex; display: flex; }
.search-input { -webkit-box-flex: 1; -webkit-flex: 1; flex: 1; height: 44px; padding: 0 14px; border: 1px solid #ddd; border-radius: 6px; font-size: 16px; outline: none; -webkit-appearance: none; appearance: none; }
.search-input:focus { border-color: #4a90d9; }
.search-btn { height: 44px; padding: 0 24px; background: #4a90d9; color: #fff; border: none; border-radius: 6px; font-size: 15px; cursor: pointer; margin-left: 8px; -webkit-appearance: none; appearance: none; }
.search-btn:hover { background: #3a7bc8; }

/* Cards */
.my-ip-card, .ip-detail-card, .form-card { background: #fff; border-radius: 10px; padding: 24px; margin-bottom: 24px; box-shadow: 0 1px 4px rgba(0,0,0,0.06); }
.card-title { font-size: 16px; font-weight: 600; margin-bottom: 16px; color: #222; }
.ip-display { text-align: center; margin-bottom: 16px; }
.ip-address { font-size: 32px; font-weight: 700; color: #4a90d9; font-family: monospace; word-break: break-all; }
.ip-display-large { text-align: center; margin-bottom: 20px; padding: 16px; background: #f8f9fa; border-radius: 8px; }
.ip-display-large .ip-address { font-size: 36px; }

/* Details */
.ip-details, .ip-details-large { margin-bottom: 16px; }
.detail-row { display: -webkit-box; display: -webkit-flex; display: flex; padding: 8px 0; border-bottom: 1px solid #f0f0f0; }
.detail-row:last-child { border-bottom: none; }
.detail-label { width: 100px; color: #888; font-size: 14px; -webkit-flex-shrink: 0; flex-shrink: 0; }
.detail-value { -webkit-box-flex: 1; -webkit-flex: 1; flex: 1; color: #333; font-size: 14px; word-break: break-all; }

/* Actions */
.card-actions { display: -webkit-box; display: -webkit-flex; display: flex; margin-top: 16px; }
.card-actions .btn { margin-right: 10px; }
.btn { display: inline-block; padding: 8px 20px; border-radius: 6px; font-size: 14px; cursor: pointer; border: none; text-align: center; text-decoration: none; -webkit-appearance: none; appearance: none; }
.btn-primary { background: #4a90d9; color: #fff; }
.btn-primary:hover { background: #3a7bc8; text-decoration: none; }
.btn-outline { background: #fff; color: #4a90d9; border: 1px solid #4a90d9; }
.btn-outline:hover { background: #f0f7ff; text-decoration: none; }
.btn-danger { background: #d9534f; color: #fff; }
.btn-danger:hover { background: #c9302c; }
.btn-block { display: block; width: 100%; }

/* Features - 用flex代替grid */
.features { display: -webkit-box; display: -webkit-flex; display: flex; -webkit-flex-wrap: wrap; flex-wrap: wrap; margin-top: 24px; margin-left: -8px; margin-right: -8px; }
.feature-item { -webkit-box-flex: 1; -webkit-flex: 1 1 30%; flex: 1 1 30%; min-width: 200px; background: #fff; border-radius: 10px; padding: 20px; text-align: center; box-shadow: 0 1px 4px rgba(0,0,0,0.06); margin: 8px; }
.feature-icon { font-size: 32px; margin-bottom: 8px; }
.feature-title { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.feature-desc { font-size: 12px; color: #888; }

/* Footer */
.site-footer { text-align: center; padding: 20px 0; color: #aaa; font-size: 12px; border-top: 1px solid #e8e8e8; }

/* Form */
.form-group { margin-bottom: 14px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 14px; color: #555; font-weight: 500; }
.form-group input, .form-group textarea, .form-group select { width: 100%; height: 42px; padding: 0 12px; border: 1px solid #ddd; border-radius: 6px; font-size: 16px; outline: none; background: #fff; -webkit-appearance: none; appearance: none; }
.form-group textarea { height: auto; padding: 8px 12px; resize: vertical; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { border-color: #4a90d9; }
.form-row { display: -webkit-box; display: -webkit-flex; display: flex; }
.form-row .form-group { -webkit-box-flex: 1; -webkit-flex: 1; flex: 1; margin-right: 12px; }
.form-row .form-group:last-child { margin-right: 0; }
.required { color: #d9534f; font-weight: bold; }
.form-desc { color: #888; font-size: 13px; margin-bottom: 14px; }
.form-section-title { font-size: 15px; font-weight: 600; margin: 16px 0 10px; padding-bottom: 6px; border-bottom: 1px solid #eee; }
.form-actions { display: -webkit-box; display: -webkit-flex; display: flex; margin-top: 16px; }
.form-actions .btn { margin-right: 10px; }

/* Current info box */
.current-info-box { background: #f8f9fa; border-radius: 6px; padding: 12px; margin-bottom: 16px; }
.current-info-title { font-size: 13px; font-weight: 600; color: #666; margin-bottom: 6px; }
.current-info-content { font-size: 13px; color: #555; line-height: 1.8; }

/* Alerts */
.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; font-size: 14px; }
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-error { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

/* Badges */
.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 12px; }
.badge-corrected { background: #fff3cd; color: #856404; }
.badge-pending { background: #fff3cd; color: #856404; }
.badge-approved { background: #d4edda; color: #155724; }
.badge-rejected { background: #f8d7da; color: #721c24; }

/* Admin */
.admin-body { background: #f0f2f5; }
.admin-layout { display: -webkit-box; display: -webkit-flex; display: flex; min-height: 100vh; }
.admin-sidebar { width: 200px; background: #1f2937; color: #fff; padding: 16px 0; -webkit-flex-shrink: 0; flex-shrink: 0; }
.admin-logo { font-size: 18px; font-weight: 700; padding: 0 20px 16px; border-bottom: 1px solid #374151; }
.admin-nav { padding: 12px 0; }
.admin-nav a { display: block; padding: 10px 20px; color: #9ca3af; font-size: 14px; text-decoration: none; }
.admin-nav a:hover, .admin-nav a.active { background: #374151; color: #fff; text-decoration: none; }
.admin-user { padding: 12px 20px; border-top: 1px solid #374151; font-size: 13px; color: #9ca3af; }
.admin-user a { color: #4a90d9; margin-left: 8px; }
.admin-main { -webkit-box-flex: 1; -webkit-flex: 1; flex: 1; padding: 24px; min-width: 0; }
.admin-page-header { margin-bottom: 20px; }
.admin-page-header h1 { font-size: 22px; margin-bottom: 6px; }
.page-desc { color: #888; font-size: 13px; }
.admin-card { background: #fff; border-radius: 8px; padding: 20px; margin-bottom: 20px; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
.admin-card-title { font-size: 16px; font-weight: 600; margin-bottom: 14px; padding-bottom: 10px; border-bottom: 1px solid #eee; }

/* Stats - 用flex代替grid */
.stats-grid { display: -webkit-box; display: -webkit-flex; display: flex; -webkit-flex-wrap: wrap; flex-wrap: wrap; margin-bottom: 20px; margin-left: -8px; margin-right: -8px; }
.stat-card { -webkit-box-flex: 1; -webkit-flex: 1 1 22%; flex: 1 1 22%; min-width: 140px; background: #fff; border-radius: 8px; padding: 20px; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,0.05); margin: 8px; }
.stat-value { font-size: 28px; font-weight: 700; color: #4a90d9; }
.stat-label { font-size: 13px; color: #888; margin-top: 4px; }
.stat-warning .stat-value { color: #f59e0b; }

/* Table */
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.admin-table th, .admin-table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid #eee; }
.admin-table th { background: #f8f9fa; font-weight: 600; color: #555; }
.admin-table tr:hover { background: #f8f9fa; }
.admin-table .empty { text-align: center; color: #aaa; padding: 30px; }
.btn-link { background: none; border: none; color: #4a90d9; cursor: pointer; font-size: 13px; padding: 0; margin-right: 10px; text-decoration: none; }
.btn-link:hover { text-decoration: underline; }
.btn-danger-link { color: #d9534f; }

/* Filter tabs */
.filter-tabs { display: -webkit-box; display: -webkit-flex; display: flex; margin-top: 8px; }
.filter-tabs a { padding: 6px 14px; border-radius: 4px; font-size: 13px; background: #e8e8e8; color: #666; margin-right: 8px; text-decoration: none; }
.filter-tabs a.active { background: #4a90d9; color: #fff; }
.filter-tabs a:hover { text-decoration: none; }

/* Detail grid - 用flex代替grid */
.detail-grid { display: -webkit-box; display: -webkit-flex; display: flex; -webkit-flex-wrap: wrap; flex-wrap: wrap; margin-bottom: 16px; margin-left: -6px; margin-right: -6px; }
.detail-item { -webkit-box-flex: 1; -webkit-flex: 1 1 45%; flex: 1 1 45%; min-width: 200px; display: -webkit-box; display: -webkit-flex; display: flex; -webkit-box-orient: vertical; -webkit-flex-direction: column; flex-direction: column; margin: 6px; }
.info-box { background: #f8f9fa; padding: 12px; border-radius: 6px; font-size: 13px; line-height: 1.8; margin-bottom: 14px; }

/* Admin login */
.admin-login-body { background: #f0f2f5; display: -webkit-box; display: -webkit-flex; display: flex; -webkit-box-align: center; -webkit-align-items: center; align-items: center; -webkit-box-pack: center; -webkit-justify-content: center; justify-content: center; min-height: 100vh; }
.admin-login-container { width: 100%; max-width: 380px; padding: 20px; }
.admin-login-card { background: #fff; border-radius: 10px; padding: 30px; box-shadow: 0 2px 10px rgba(0,0,0,0.08); }
.admin-login-card h2 { text-align: center; margin-bottom: 20px; font-size: 20px; }

/* Responsive */
@media (max-width: 768px) {
    .features { margin-left: 0; margin-right: 0; }
    .feature-item { -webkit-flex: 1 1 100%; flex: 1 1 100%; min-width: 100%; margin-left: 0; margin-right: 0; }
    .stats-grid { margin-left: 0; margin-right: 0; }
    .stat-card { -webkit-flex: 1 1 45%; flex: 1 1 45%; min-width: 45%; margin-left: 4px; margin-right: 4px; }
    .form-row { -webkit-box-orient: vertical; -webkit-flex-direction: column; flex-direction: column; }
    .form-row .form-group { margin-right: 0; }
    .admin-layout { -webkit-box-orient: vertical; -webkit-flex-direction: column; flex-direction: column; }
    .admin-sidebar { width: 100%; padding: 8px 0; }
    .admin-nav { display: -webkit-box; display: -webkit-flex; display: flex; -webkit-flex-wrap: wrap; flex-wrap: wrap; padding: 4px 0; }
    .admin-nav a { padding: 8px 14px; font-size: 13px; }
    .admin-user { display: none; }
    .admin-main { padding: 16px; }
    .detail-grid { margin-left: 0; margin-right: 0; }
    .detail-item { -webkit-flex: 1 1 100%; flex: 1 1 100%; min-width: 100%; margin-left: 0; margin-right: 0; }
    .ip-address { font-size: 24px; }
    .ip-display-large .ip-address { font-size: 28px; }
    .search-box form { -webkit-box-orient: vertical; -webkit-flex-direction: column; flex-direction: column; }
    .search-btn { width: 100%; margin-left: 0; margin-top: 8px; }
    .admin-table { font-size: 12px; }
    .admin-table th, .admin-table td { padding: 8px 6px; }
}


/* ===== 紧凑布局优化 ===== */
.site-header { padding: 10px 0; }
.site-header .logo a { font-size: 17px; }
.site-header .nav a { margin-left: 14px; font-size: 13px; }
.nav-user { color: #4a90d9; font-size: 13px; margin-left: 14px; font-weight: 600; }

.main { padding: 14px 0; }

.hero { margin-bottom: 14px; }
.hero h1 { font-size: 22px; margin-bottom: 4px; }
.hero .subtitle { font-size: 12px; }

.search-box { margin-bottom: 14px; }
.search-input { height: 38px; font-size: 14px; padding: 0 12px; }
.search-btn { height: 38px; padding: 0 18px; font-size: 14px; }

.my-ip-card, .ip-detail-card, .form-card { padding: 16px; margin-bottom: 14px; }
.card-title { font-size: 14px; margin-bottom: 10px; }
.ip-display { margin-bottom: 10px; }
.ip-address { font-size: 26px; }
.ip-display-large { margin-bottom: 12px; padding: 10px; }
.ip-display-large .ip-address { font-size: 28px; }

.ip-details, .ip-details-large { margin-bottom: 10px; }
.detail-row { padding: 5px 0; }
.detail-label { width: 80px; font-size: 13px; }
.detail-value { font-size: 13px; }

.card-actions { margin-top: 10px; }
.btn { padding: 6px 16px; font-size: 13px; }

.features { margin-top: 14px; }
.feature-item { padding: 14px; }
.feature-icon { font-size: 26px; margin-bottom: 6px; }
.feature-title { font-size: 13px; }
.feature-desc { font-size: 11px; }

.site-footer { padding: 12px 0; font-size: 11px; }

.form-group { margin-bottom: 10px; }
.form-group label { font-size: 13px; margin-bottom: 4px; }
.form-group input, .form-group textarea, .form-group select { height: 38px; font-size: 14px; padding: 0 10px; }
.form-section-title { font-size: 14px; margin: 12px 0 8px; }
.form-desc { font-size: 12px; margin-bottom: 10px; }
.current-info-box { padding: 10px; margin-bottom: 12px; }
.current-info-title { font-size: 12px; }
.current-info-content { font-size: 12px; line-height: 1.7; }

@media (max-width: 768px) {
    .ip-address { font-size: 20px; }
    .ip-display-large .ip-address { font-size: 22px; }
    .hero h1 { font-size: 20px; }
    .site-header .nav a { margin-left: 10px; font-size: 12px; }
    .nav-user { margin-left: 10px; font-size: 12px; }
}