/* ========================================
   CSS RESET & BASE
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    
    /* Neutral Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    /* Border & Shadow */
    --border: #475569;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Monaco', 'Consolas', monospace;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ========================================
   HEADER
   ======================================== */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: var(--space-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.header-actions {
    display: flex;
    gap: var(--space-sm);
}

/* ========================================
   SEARCH & FILTER BAR
   ======================================== */
.search-bar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: var(--space-lg);
    position: sticky;
    top: 69px;
    z-index: 90;
}

.search-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.search-input-wrapper {
    position: relative;
    flex: 1;
}

.search-icon {
    position: absolute;
    left: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: var(--space-md) var(--space-md) var(--space-md) 3rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.filter-group {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.filter-select {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-base);
    min-width: 160px;
}

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

/* ========================================
   BUTTONS
   ======================================== */
.btn-primary,
.btn-secondary,
.btn-icon,
.btn-filter {
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-icon {
    background: transparent;
    color: var(--text-secondary);
    padding: var(--space-sm);
}

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

.btn-filter {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

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

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-close {
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

/* ========================================
   MAIN CONTENT
   ======================================== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    min-height: calc(100vh - 200px);
}

/* ========================================
   LIST VIEW
   ======================================== */
.list-view {
    position: relative;
}

.snippets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.snippet-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

.snippet-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
    gap: var(--space-sm);
}

.snippet-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
    line-height: 1.4;
}

.snippet-actions {
    display: flex;
    gap: var(--space-xs);
}

.btn-favorite {
    background: transparent;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    padding: var(--space-xs);
    transition: all var(--transition-fast);
    filter: grayscale(100%);
}

.btn-favorite.active {
    filter: grayscale(0%);
    transform: scale(1.2);
}

.btn-copy {
    background: var(--bg-tertiary);
    border: none;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.snippet-content {
    background: var(--bg-tertiary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    overflow-x: auto;
    margin-bottom: var(--space-md);
    white-space: pre-wrap;
    word-break: break-word;
}

.snippet-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.snippet-category {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: var(--primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.snippet-tags {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-tertiary);
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

.snippet-connections {
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border);
}

.connections-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* ========================================
   EMPTY STATE
   ======================================== */
.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-2xl);
    min-height: 400px;
}

.empty-state.show {
    display: flex;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--space-lg);
    opacity: 0.5;
}

.empty-state h2 {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
    max-width: 400px;
}

/* ========================================
   FLOW VIEW
   ======================================== */
.flow-view {
    position: relative;
    min-height: 600px;
}

.flow-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.flow-info {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.flow-canvas {
    width: 100%;
    height: 600px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    cursor: grab;
}

.flow-canvas:active {
    cursor: grabbing;
}

.flow-empty {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    pointer-events: none;
}

.flow-empty.hide {
    display: none;
}

/* ========================================
   MODAL
   ======================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.modal.show {
    display: flex;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn var(--transition-base);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.modal-header h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-lg);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

/* ========================================
   FORM
   ======================================== */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-base);
}

.form-textarea {
    resize: vertical;
    font-family: var(--font-mono);
    line-height: 1.6;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-select {
    cursor: pointer;
}

.form-select[multiple] {
    padding: var(--space-sm);
}

.form-select[multiple] option {
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-xs);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-help {
    display: block;
    margin-top: var(--space-xs);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ========================================
   DETAIL MODAL
   ======================================== */
.modal-detail {
    max-width: 800px;
}

.detail-meta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}

.detail-category {
    padding: var(--space-xs) var(--space-md);
    background: var(--primary);
    color: white;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
}

.detail-date {
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-tertiary);
    color: var(--text-muted);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.detail-tags {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.detail-tags .tag {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.detail-content-wrapper {
    position: relative;
    margin-bottom: var(--space-lg);
}

.detail-content {
    background: var(--bg-tertiary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

.btn-copy-large {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    padding: var(--space-sm) var(--space-lg);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-copy-large:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.detail-connections {
    margin-bottom: var(--space-lg);
}

.detail-connections h3 {
    font-size: 1rem;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.connection-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.connection-item {
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.connection-item:hover {
    background: var(--border);
    color: var(--text-primary);
}

.detail-actions {
    display: flex;
    gap: var(--space-sm);
    justify-content: flex-end;
}

/* ========================================
   TOAST NOTIFICATION
   ======================================== */
.toast {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    font-size: 0.875rem;
    font-weight: 600;
    z-index: 2000;
    transform: translateY(150%);
    transition: transform var(--transition-base);
}

.toast.show {
    transform: translateY(0);
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    .header-content {
        padding: 0 var(--space-md);
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .search-bar {
        padding: var(--space-md);
        top: 61px;
    }
    
    .main-content {
        padding: var(--space-lg) var(--space-md);
    }
    
    .snippets-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .filter-group {
        width: 100%;
    }
    
    .filter-select {
        flex: 1;
        min-width: auto;
    }
    
    .btn-filter {
        flex: 1;
    }
    
    .modal-content {
        max-height: 95vh;
    }
    
    .toast {
        bottom: var(--space-md);
        right: var(--space-md);
        left: var(--space-md);
    }
    
    .flow-canvas {
        height: 400px;
    }
}

@media (max-width: 480px) {
    .header-actions {
        gap: var(--space-xs);
    }
    
    .btn-primary {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.8rem;
    }
    
    .snippet-card {
        padding: var(--space-md);
    }
    
    .snippet-title {
        font-size: 1rem;
    }
    
    .snippet-content {
        font-size: 0.8rem;
    }
}

/* ========================================
   SCROLLBAR
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-sm);
}

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

/* ========================================
   UTILITIES
   ======================================== */
.hide {
    display: none !important;
}

.show {
    display: block !important;
}