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

:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --secondary: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #0f172a;
    --dark-lighter: #1e293b;
    --dark-card: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--dark);
    color: var(--text);
    min-height: 100vh;
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: grid-move 20s linear infinite;
}

@keyframes grid-move {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.login-container {
    position: relative;
    z-index: 1;
}

.login-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 3rem;
    width: 400px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

.logo {
    text-align: center;
    margin-bottom: 2rem;
}

.logo-icon {
    font-size: 4rem;
    margin-bottom: 0.5rem;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    color: white;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
}

.input-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    color: white;
    font-size: 1rem;
    transition: all 0.3s;
}

.input-group input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.4);
}

.input-group input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.input-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
}

.btn-primary {
    width: 100%;
    padding: 0.875rem;
    background: white;
    color: #667eea;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.error-message {
    margin-top: 1rem;
    padding: 0.75rem;
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: #fca5a5;
    text-align: center;
    display: none;
}

.error-message.show {
    display: block;
}

/* Navbar */
.navbar {
    background: var(--dark-card);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.nav-brand .logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: 1rem;
}

.nav-link {
    padding: 0.5rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--text);
    background: rgba(99, 102, 241, 0.1);
}

.nav-link.active {
    color: white;
    background: var(--primary);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-logout {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-logout:hover {
    background: var(--danger);
    border-color: var(--danger);
    color: white;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-header h2 {
    font-size: 2rem;
    font-weight: 700;
}

.header-actions {
    display: flex;
    gap: 1rem;
}

.btn-add {
    width: auto;
    padding: 0.75rem 1.5rem;
}

/* Category Section */
.category-section {
    margin-bottom: 3rem;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 1rem;
    border-bottom: 2px solid var(--border);
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.3s;
    user-select: none;
}

.category-header:hover {
    background: rgba(99, 102, 241, 0.05);
}

.category-title {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.toggle-icon {
    font-size: 1rem;
    color: var(--text-secondary);
    transition: transform 0.3s;
    min-width: 1rem;
}

.category-icon {
    font-size: 2rem;
}

.category-title h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.category-count {
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 600;
}

/* Collapsed category */
.category-section.collapsed .category-content {
    display: none;
}

.category-section.collapsed .category-header {
    margin-bottom: 0;
}

.category-content {
    transition: all 0.3s ease-in-out;
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

/* Cards */
.card {
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient);
    opacity: 0;
    transition: opacity 0.3s;
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.2);
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.card-body {
    flex: 1;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.card-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    padding: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

.btn-icon.delete:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.card-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
    min-height: 2.4em;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    margin-top: auto;
}

.card-link:hover {
    color: var(--primary-hover);
}

.card {
    display: flex;
    flex-direction: column;
}

/* Server Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.stat {
    background: rgba(15, 23, 42, 0.5);
    padding: 1rem;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-bar {
    margin-top: 0.5rem;
    height: 6px;
    background: rgba(15, 23, 42, 0.5);
    border-radius: 3px;
    overflow: hidden;
}

.stat-fill {
    height: 100%;
    background: var(--gradient);
    transition: width 0.5s;
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-badge.online {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
    border: 1px solid var(--success);
}

.status-badge.offline {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
    border: 1px solid var(--danger);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    width: 500px;
    max-width: 90vw;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1.5rem;
}

.close {
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s;
}

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

.modal form {
    padding: 1.5rem;
}

.modal .input-group input,
.modal .input-group textarea {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border);
    color: var(--text);
}

.modal .input-group label {
    color: var(--text);
}

.modal .input-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-size: 1rem;
    cursor: pointer;
}

.modal .input-group select:focus {
    outline: none;
    border-color: var(--primary);
}

/* File Upload */
.file-upload-area {
    border: 2px dashed var(--border);
    border-radius: 10px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.file-upload-area:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.file-upload-content {
    cursor: pointer;
}

.image-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.upload-icon {
    font-size: 2.5rem;
}

.upload-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.card-image {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 0.5rem;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 150px;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.modal-actions button {
    flex: 1;
}

.btn-secondary {
    padding: 0.875rem;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background: var(--dark-lighter);
}

/* Speed Test Styles */
.speedtest-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    color: var(--primary);
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0.5rem 0;
}

.stat-unit {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.chart-container {
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    height: 500px;
}

/* Responsive */
@media (max-width: 768px) {
    .grid {
        grid-template-columns: 1fr;
    }
    
    .navbar {
        flex-direction: column;
        gap: 1rem;
    }
    
    .page-header {
        flex-direction: column;
        gap: 1rem;
        align-items: start;
    }
    
    .btn-add {
        width: 100%;
    }
    
    .speedtest-summary {
        grid-template-columns: 1fr 1fr;
    }
    
    .chart-container {
        height: 400px;
        padding: 1rem;
    }
}