/* ============================================
   Reset & Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

/* ============================================
   Utility Classes
   ============================================ */
.screen {
    display: none;
}

.screen.active {
    display: block;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #475569;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

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

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   Login Screen
   ============================================ */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-card {
    background: var(--surface);
    padding: 3rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

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

.logo i {
    font-size: 3rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-top: 0.5rem;
}

.login-card h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

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

#login-form .btn {
    width: 100%;
    margin-top: 1rem;
}

.error-message {
    color: var(--danger-color);
    text-align: center;
    margin-top: 1rem;
    display: none;
}

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

.success-message {
    color: var(--success-color);
    text-align: center;
    margin-top: 1rem;
    display: none;
    padding: 1rem;
    background-color: #d1fae5;
    border-radius: 0.5rem;
}

.success-message.active {
    display: block;
}

.login-footer {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.login-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.login-footer a:hover {
    text-decoration: underline;
}

.login-card small {
    display: block;
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.verification-content {
    text-align: center;
    padding: 2rem 0;
}

.verification-content p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.email-display {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 1.5rem 0;
}

.verification-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

.verification-actions .btn {
    width: 100%;
}

/* ============================================
   Navigation Bar
   ============================================ */
.navbar {
    background: var(--surface);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-brand i {
    font-size: 2rem;
}

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

#user-display {
    font-weight: 500;
    color: var(--text-primary);
}

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

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

.dashboard-header h1 {
    font-size: 2rem;
    color: var(--text-primary);
}

/* ============================================
   Stats Cards
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.stat-icon.running {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.stat-icon.stopped {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.stat-icon.suspended {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.stat-icon.total {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
}

.stat-info h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

/* ============================================
   VM List
   ============================================ */
.vm-list-container h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

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

.vm-card {
    background: var(--surface);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.vm-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

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

.vm-card-title {
    flex: 1;
}

.vm-card-title h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.vm-card-title p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.vm-status {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.vm-status.running {
    background-color: #d1fae5;
    color: #065f46;
}

.vm-status.terminated,
.vm-status.stopped {
    background-color: #fee2e2;
    color: #991b1b;
}

.vm-status.suspended {
    background-color: #fef3c7;
    color: #92400e;
}

.vm-status.created {
    background-color: #dbeafe;
    color: #1e40af;
}

.vm-card-info {
    margin-bottom: 1rem;
    padding: 1rem;
    background-color: var(--background);
    border-radius: 0.5rem;
}

.vm-info-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.vm-info-item:last-child {
    margin-bottom: 0;
}

.vm-info-label {
    color: var(--text-secondary);
}

.vm-info-value {
    color: var(--text-primary);
    font-weight: 500;
}

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

.vm-card-actions .btn {
    flex: 1;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.no-data {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.no-data i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* ============================================
   Modal
   ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    overflow-y: auto;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.modal-content {
    background: var(--surface);
    border-radius: 1rem;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

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

.modal-header h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.5rem;
}

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

.modal-content form {
    padding: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.radio-group {
    display: flex;
    gap: 1rem;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* VM Details Modal */
.vm-details-content {
    padding: 1.5rem;
}

.detail-section {
    margin-bottom: 2rem;
}

.detail-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.detail-grid {
    display: grid;
    gap: 1rem;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem;
    background-color: var(--background);
    border-radius: 0.5rem;
}

.detail-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.detail-value {
    color: var(--text-primary);
}

.connection-info {
    padding: 1rem;
    background-color: var(--background);
    border-radius: 0.5rem;
}

.code-block {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--text-primary);
    border-radius: 0.5rem;
}

.code-block code {
    flex: 1;
    color: #10b981;
    font-family: 'Courier New', monospace;
}

/* ============================================
   Loading & Toast
   ============================================ */
.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-overlay p {
    color: white;
    margin-top: 1rem;
    font-size: 1.25rem;
}

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--text-primary);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 3000;
    animation: slideIn 0.3s ease;
}

.toast.active {
    display: block;
}

.toast.success {
    background-color: var(--success-color);
}

.toast.error {
    background-color: var(--danger-color);
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

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

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .navbar {
        padding: 1rem;
    }

    .nav-user {
        flex-direction: column;
        align-items: flex-end;
    }
}