:root {
    --primary-color: #1a237e;
    --primary-light: #3949ab;
    --primary-dark: #0d1642;
    --accent-color: #00bcd4;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --danger-color: #f44336;
    --bg-color: #0a0f24;
    --bg-secondary: #111a3a;
    --bg-card: #162040;
    --text-primary: #ffffff;
    --text-secondary: #b0bec5;
    --border-color: #2d3a5f;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: #26c6da;
    text-shadow: 0 0 10px rgba(0, 188, 212, 0.5);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    padding: 20px 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid var(--accent-color);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-color), var(--primary-light));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 4px 15px rgba(0, 188, 212, 0.3);
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--text-primary), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text span {
    font-size: 0.75rem;
    color: var(--text-secondary);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    gap: 20px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
}

.main-content {
    padding: 40px 0;
    min-height: calc(100vh - 200px);
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-title::before {
    content: '';
    width: 4px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 2px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(57, 73, 171, 0.4);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(57, 73, 171, 0.5);
}

.btn-success {
    background: linear-gradient(135deg, #43a047, #2e7d32);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.4);
}

.btn-success:hover {
    background: linear-gradient(135deg, #388e3c, #1b5e20);
    transform: translateY(-2px);
}

.btn-danger {
    background: linear-gradient(135deg, #e53935, #c62828);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(244, 67, 54, 0.4);
}

.btn-danger:hover {
    background: linear-gradient(135deg, #d32f2f, #b71c1c);
    transform: translateY(-2px);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent-color), #0097a7);
    color: var(--bg-color);
    font-weight: 700;
    box-shadow: 0 4px 15px rgba(0, 188, 212, 0.4);
}

.btn-accent:hover {
    background: linear-gradient(135deg, #00acc1, #00838f);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 188, 212, 0.5);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

.input-group {
    margin-bottom: 20px;
}

.input-label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
}

.input-field {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.input-field:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 188, 212, 0.2);
}

.input-field::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.select-field {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23b0bec5' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    padding-right: 40px;
}

.grid {
    display: grid;
    gap: 20px;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.user-card {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.user-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
}

.user-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-3px);
}

.user-card:hover::before {
    opacity: 1;
}

.user-card.selected {
    border-color: var(--success-color);
    background: rgba(76, 175, 80, 0.1);
}

.user-card.selected::before {
    background: var(--success-color);
    opacity: 1;
}

.user-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    margin: 0 auto 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.user-nickname {
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.user-status {
    text-align: center;
    font-size: 0.75rem;
    padding: 4px 12px;
    border-radius: 20px;
    display: inline-block;
    margin: 0 auto;
    width: 100%;
}

.user-status.active {
    background: rgba(76, 175, 80, 0.2);
    color: var(--success-color);
}

.user-status.banned {
    background: rgba(244, 67, 54, 0.2);
    color: var(--danger-color);
}

.user-status.expired {
    background: rgba(255, 152, 0, 0.2);
    color: var(--warning-color);
}

.user-meta {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

.qr-container {
    background: white;
    padding: 20px;
    border-radius: var(--radius);
    display: inline-block;
    box-shadow: var(--shadow);
}

.qr-container svg {
    width: 100%;
    height: auto;
    max-width: 180px;
}

.qr-card {
    width: 100%;
}

.qr-info {
    width: 100%;
}

.qr-info > div {
    display: flex;
    flex-direction: column;
    gap: 4px;
    word-break: break-all;
}

.qr-code {
    width: 200px;
    height: 200px;
    display: block;
}

.auth-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-top: 20px;
}

.auth-info-item {
    background: var(--bg-secondary);
    padding: 15px;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-color);
}

.auth-info-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.auth-info-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-all;
}

.search-box {
    position: relative;
    margin-bottom: 20px;
}

.search-box input {
    padding-left: 45px;
}

.search-box::before {
    content: '🔍';
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
    padding: 25px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-3px);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.alert {
    padding: 15px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background: rgba(76, 175, 80, 0.15);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.alert-danger {
    background: rgba(244, 67, 54, 0.15);
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}

.alert-warning {
    background: rgba(255, 152, 0, 0.15);
    border: 1px solid var(--warning-color);
    color: var(--warning-color);
}

.alert-info {
    background: rgba(0, 188, 212, 0.15);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    gap: 5px;
}

.badge-success {
    background: rgba(76, 175, 80, 0.2);
    color: var(--success-color);
}

.badge-danger {
    background: rgba(244, 67, 54, 0.2);
    color: var(--danger-color);
}

.badge-warning {
    background: rgba(255, 152, 0, 0.2);
    color: var(--warning-color);
}

.table-container {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.data-table th,
.data-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.data-table tr:hover {
    background: rgba(0, 188, 212, 0.05);
}

.data-table tr:last-child td {
    border-bottom: none;
}

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-success {
    color: var(--success-color);
}

.text-danger {
    color: var(--danger-color);
}

.text-warning {
    color: var(--warning-color);
}

.text-muted {
    color: var(--text-secondary);
}

.flex {
    display: flex;
}

.flex-center {
    justify-content: center;
    align-items: center;
}

.flex-between {
    justify-content: space-between;
}

.gap-10 {
    gap: 10px;
}

.gap-20 {
    gap: 20px;
}

.mt-10 {
    margin-top: 10px;
}

.mt-20 {
    margin-top: 20px;
}

.mb-10 {
    margin-bottom: 10px;
}

.mb-20 {
    margin-bottom: 20px;
}

.hidden {
    display: none !important;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 15, 36, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

.spinner-overlay .loading {
    width: 50px;
    height: 50px;
    border-width: 4px;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 15, 36, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9998;
    backdrop-filter: blur(5px);
    padding: 20px;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
    line-height: 1;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--danger-color);
}

.modal-body {
    padding: 25px;
}

.modal-footer {
    padding: 20px 25px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.footer {
    background: var(--primary-dark);
    padding: 30px 0;
    margin-top: 60px;
    border-top: 2px solid var(--border-color);
}

.footer-content {
    text-align: center;
    color: var(--text-secondary);
}

.footer-content p {
    margin-bottom: 10px;
}

.footer-version {
    font-size: 0.875rem;
    color: var(--accent-color);
}

.admin-layout {
    display: flex;
    min-height: calc(100vh - 120px);
    gap: 0;
}

.admin-sidebar {
    width: 250px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 30px 0;
    flex-shrink: 0;
}

.admin-nav {
    list-style: none;
}

.admin-nav-item {
    margin: 5px 0;
}

.admin-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 25px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.admin-nav-link:hover {
    color: var(--text-primary);
    background: rgba(0, 188, 212, 0.1);
}

.admin-nav-link.active {
    color: var(--accent-color);
    background: rgba(0, 188, 212, 0.15);
    border-left-color: var(--accent-color);
}

.admin-main {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.location-status {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
}

.location-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-secondary);
}

.location-dot.success {
    background: var(--success-color);
    box-shadow: 0 0 10px rgba(76, 175, 80, 0.5);
}

.location-dot.warning {
    background: var(--warning-color);
    box-shadow: 0 0 10px rgba(255, 152, 0, 0.5);
}

.location-dot.error {
    background: var(--danger-color);
    box-shadow: 0 0 10px rgba(244, 67, 54, 0.5);
}

.anomaly-badge {
    display: inline-flex;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.anomaly-badge.vpn {
    background: rgba(156, 39, 176, 0.2);
    color: #ce93d8;
}

.anomaly-badge.location {
    background: rgba(255, 152, 0, 0.2);
    color: var(--warning-color);
}

.anomaly-badge.fingerprint {
    background: rgba(33, 150, 243, 0.2);
    color: #64b5f6;
}

.anomaly-badge.reputation {
    background: rgba(244, 67, 54, 0.2);
    color: var(--danger-color);
}

@media (max-width: 992px) {
    .admin-layout {
        flex-direction: column;
    }

    .admin-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 15px 0;
    }

    .admin-nav {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        padding: 0 15px;
    }

    .admin-nav-link {
        padding: 10px 15px;
        border-left: none;
        border-radius: var(--radius-sm);
    }

    .admin-nav-link.active {
        border-left: none;
        background: rgba(0, 188, 212, 0.2);
    }

    .admin-main {
        padding: 20px;
    }

    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .auth-info {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-card {
        padding: 20px;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .card {
        padding: 20px;
    }

    .user-avatar {
        width: 48px;
        height: 48px;
        font-size: 18px;
    }

    .qr-container {
        padding: 15px;
    }

    .qr-container svg {
        max-width: 160px;
    }

    .qr-card {
        padding: 20px !important;
    }

    .qr-info > div {
        font-size: 0.875rem;
    }

    .qr-code {
        width: 150px;
        height: 150px;
    }

    .modal-content {
        max-width: 100%;
        margin: 10px;
    }

    .modal-body {
        padding: 20px;
    }

    .modal-header,
    .modal-footer {
        padding: 15px 20px;
    }
}

@media (max-width: 576px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 0 15px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .data-table th,
    .data-table td {
        padding: 10px;
        font-size: 0.875rem;
    }

    .btn {
        padding: 10px 18px;
        font-size: 0.9rem;
    }

    .btn-sm {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .input-field {
        padding: 12px 15px;
    }

    .qr-card {
        padding: 16px !important;
    }

    .qr-container {
        padding: 12px;
    }

    .qr-container svg {
        max-width: 140px;
    }

    .qr-info {
        padding: 12px;
        font-size: 12px;
    }

    .modal-overlay {
        padding: 10px;
    }

    .modal-content {
        margin: 10px;
        border-radius: 12px;
    }

    .modal-header,
    .modal-footer {
        padding: 12px 15px;
    }

    .modal-body {
        padding: 15px;
    }

    .modal-title {
        font-size: 1.1rem;
    }
}