:root {
    --bg-base: #0A0E1A;
    --bg-surface: #12182B;
    --bg-surface-hover: #1A223A;
    --bg-panel: rgba(18, 24, 43, 0.7);
    --border-color: #2A3655;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    
    --primary: #2496ED;
    --primary-hover: #1C7ED6;
    --secondary: #60A5FA;
    --accent: #06B6D4;
    --success: #10B981;
    --danger: #EF4444;
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 15px rgba(36, 150, 237, 0.2);

    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
}

/* Typography */
h1 { font-size: 1.25rem; font-weight: 600; }
h2 { font-size: 1rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 1rem; }
h3 { font-size: 1.125rem; font-weight: 600; }
h4 { font-size: 0.875rem; font-weight: 500; color: var(--text-secondary); margin-bottom: 0.5rem; }
.subtitle { font-size: 0.875rem; color: var(--text-secondary); margin-top: -0.75rem; margin-bottom: 1rem; }

/* Buttons & Inputs */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

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

.btn.primary:hover {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-glow);
}

.btn.secondary {
    background-color: var(--bg-surface-hover);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn.outline {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px dashed var(--border-color);
}

.btn.outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn.sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon:hover {
    background-color: var(--bg-surface-hover);
    color: var(--text-primary);
}

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

.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(36, 150, 237, 0.2);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

/* Layout */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary);
}

.logo h1 {
    color: var(--text-primary);
}

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

.icon-link {
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.workspace {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.sidebar-section {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* Templates */
.template-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.template-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: grab;
    transition: var(--transition);
}

.template-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.template-card:active {
    cursor: grabbing;
}

.template-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background-color: rgba(36, 150, 237, 0.1);
    color: var(--primary);
}

.template-info h4 {
    margin: 0;
    color: var(--text-primary);
}

.template-info p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Center: Visual Editor */
.visual-editor {
    flex: 1;
    position: relative;
    background: radial-gradient(circle at center, var(--bg-surface) 0%, var(--bg-base) 100%);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.editor-header {
    position: absolute;
    top: 1rem;
    left: 1.5rem;
    right: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 5;
    pointer-events: none;
}

.editor-header h2 {
    margin: 0;
}

.editor-header .btn {
    pointer-events: auto;
}

.services-container {
    flex: 1;
    position: relative;
    overflow: auto;
    padding: 4rem 2rem 2rem;
    z-index: 2;
    /* Grid background */
    background-image: 
        linear-gradient(to right, rgba(42, 54, 85, 0.3) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(42, 54, 85, 0.3) 1px, transparent 1px);
    background-size: 40px 40px;
}

.empty-state {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    pointer-events: none;
}

.empty-state i {
    width: 48px;
    height: 48px;
    color: var(--border-color);
}

.empty-state p.sub {
    font-size: 0.875rem;
}

/* Service Box */
.service-box {
    position: absolute;
    width: 260px;
    background: var(--bg-panel);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    cursor: grab;
    user-select: none;
    transition: box-shadow 0.2s, border-color 0.2s;
    z-index: 10;
}

.service-box:active {
    cursor: grabbing;
}

.service-box:hover {
    border-color: var(--secondary);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.service-box.dragging {
    opacity: 0.8;
    z-index: 100;
}

.service-box-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(0,0,0,0.2);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.service-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
}

.service-actions {
    display: flex;
    gap: 0.25rem;
}

.service-actions .btn-icon {
    width: 24px;
    height: 24px;
}

.service-actions .btn-icon i {
    width: 14px;
    height: 14px;
}

.service-body {
    padding: 1rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.service-prop {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.service-prop i {
    width: 14px;
    height: 14px;
    color: var(--primary);
    margin-top: 2px;
}

.service-prop span {
    word-break: break-all;
}

.prop-badge {
    background: rgba(36, 150, 237, 0.1);
    color: var(--secondary);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    margin-right: 0.25rem;
    margin-bottom: 0.25rem;
    display: inline-block;
}

#dependency-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* Right: YAML Output */
.yaml-preview {
    width: 400px;
    background-color: var(--bg-surface);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

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

.preview-header h2 {
    margin: 0;
}

.validation-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.validation-status i {
    width: 16px;
    height: 16px;
}

.validation-status.valid {
    color: var(--success);
}

.validation-status.invalid {
    color: var(--danger);
}

.editor-wrapper {
    flex: 1;
    position: relative;
    padding: 1rem;
}

#yaml-output {
    width: 100%;
    height: 100%;
    background-color: var(--bg-base);
    color: #E2E8F0;
    font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    resize: none;
    outline: none;
    line-height: 1.6;
    tab-size: 2;
}

#yaml-output:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(36, 150, 237, 0.2);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background-color: var(--bg-surface);
    width: 100%;
    max-width: 600px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    max-height: 90vh;
    transform: scale(0.95);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.config-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px dashed var(--border-color);
}

.dynamic-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.list-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.list-item .separator {
    color: var(--text-secondary);
    font-weight: 600;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Responsive */
@media (max-width: 1200px) {
    .yaml-preview {
        width: 300px;
    }
}

@media (max-width: 900px) {
    .workspace {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: 200px;
        flex-direction: row;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        flex-shrink: 0;
    }
    
    .sidebar-section {
        flex: 1;
        border-bottom: none;
        border-right: 1px solid var(--border-color);
    }
    
    .yaml-preview {
        width: 100%;
        height: 300px;
        border-left: none;
        border-top: 1px solid var(--border-color);
        flex-shrink: 0;
    }
}