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

:root {
    --primary: #25D366;
    --primary-dark: #1da851;
    --secondary: #128C7E;
    --danger: #dc3545;
    --warning: #ffc107;
    --success: #28a745;
    --text: #2c3e50;
    --text-light: #6c757d;
    --bg: #f0f2f5;
    --card-bg: #ffffff;
    --border: #e1e8ed;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* Login Screen */
.login-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.login-container {
    background: var(--card-bg);
    padding: 40px 30px;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.logo {
    font-size: 64px;
    margin-bottom: 10px;
}

.login-header h1 {
    font-size: 28px;
    color: var(--text);
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-light);
    font-size: 14px;
}

/* App Header */
.app-header {
    background: var(--primary);
    color: white;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo-small {
    font-size: 32px;
}

.header-title h1 {
    font-size: 20px;
    font-weight: 600;
}

.header-title p {
    font-size: 12px;
    opacity: 0.9;
}

/* Stats Container */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    padding: 16px;
    background: var(--bg);
}

.stat-card {
    background: var(--card-bg);
    padding: 16px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s;
}

.stat-card.clickable {
    cursor: pointer;
}

.stat-card.clickable:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.stat-card.clickable:active {
    transform: scale(0.98);
}

.stat-card:not(.clickable):active {
    transform: scale(0.98);
}

.stat-icon {
    font-size: 32px;
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary);
}

.stat-label {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

/* Tabs */
.tabs-container {
    background: var(--card-bg);
    margin: 0 16px 16px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.tabs {
    display: flex;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    flex: 1;
    padding: 14px 16px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-light);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background: var(--card-bg);
}

.tab-content {
    display: none;
    padding: 16px;
}

.tab-content.active {
    display: block;
}

/* Systems List */
.systems-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.system-card {
    background: var(--bg);
    padding: 16px;
    border-radius: 12px;
    border-left: 4px solid var(--primary);
}

.system-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.system-info h3 {
    font-size: 18px;
    color: var(--text);
    margin-bottom: 4px;
}

.system-info p {
    font-size: 13px;
    color: var(--text-light);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.status-badge.active {
    background: #d4edda;
    color: #155724;
}

.status-badge.inactive {
    background: #f8d7da;
    color: #721c24;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: currentColor;
}

.system-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 8px;
    margin-bottom: 12px;
    font-size: 13px;
}

.meta-item {
    display: flex;
    flex-direction: column;
}

.meta-label {
    color: var(--text-light);
    font-size: 11px;
}

.meta-value {
    color: var(--text);
    font-weight: 600;
}

.system-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* Form */
.create-form-container {
    max-width: 600px;
}

.create-form-container h2 {
    font-size: 24px;
    margin-bottom: 8px;
}

.form-description {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 24px;
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.3s;
}

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

.form-group textarea {
    resize: vertical;
}

.form-group small {
    display: block;
    margin-top: 6px;
    color: var(--text-light);
    font-size: 12px;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

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

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

.btn-sm {
    padding: 8px 16px;
    font-size: 12px;
}

.btn-block {
    width: 100%;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border-left: 4px solid var(--danger);
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-left: 4px solid var(--success);
}

/* API Key Display */
.api-key-display {
    background: var(--bg);
    padding: 20px;
    border-radius: 12px;
    margin-top: 24px;
    border: 2px dashed var(--primary);
}

.api-key-display h3 {
    margin-bottom: 12px;
}

.api-key-box {
    background: var(--card-bg);
    padding: 16px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    word-break: break-all;
    margin-bottom: 12px;
    border: 1px solid var(--border);
}

.warning-text {
    color: var(--danger);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 12px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    padding: 20px;
    overflow-y: auto;
}

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

.modal-content {
    background: var(--card-bg);
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

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

.modal-header h3 {
    font-size: 20px;
}

.btn-close {
    background: transparent;
    border: none;
    font-size: 32px;
    cursor: pointer;
    color: var(--text-light);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.btn-close:hover {
    background: var(--bg);
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* Loading */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-spinner p {
    margin-top: 16px;
    color: var(--text-light);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .system-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .modal-content {
        max-height: 95vh;
    }

    .modal-footer {
        flex-direction: column-reverse;
    }

    .modal-footer .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .stats-container {
        grid-template-columns: 1fr;
    }

    .app-header {
        padding: 12px 16px;
    }

    .header-title h1 {
        font-size: 18px;
    }

    .stat-value {
        font-size: 20px;
    }

    .tabs-container {
        margin: 0 8px 8px;
    }

    .login-container {
        padding: 30px 20px;
    }
}