/* =============================================================================
   Synapse — Modern, Clean Styles
   ============================================================================= */

:root {
    /* Colors */
    --color-bg: #0a0a0b;
    --color-bg-secondary: #141415;
    --color-bg-tertiary: #1c1c1e;
    --color-border: #2a2a2d;
    --color-text: #e4e4e7;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    --color-primary: #6366f1;
    --color-primary-hover: #818cf8;
    --color-danger: #ef4444;
    --color-success: #22c55e;
    --color-warning: #f59e0b;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;

    /* Borders */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Transitions */
    --transition: 150ms ease;
}

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

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* =============================================================================
   Header
   ============================================================================= */

.header {
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    background: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text);
    text-decoration: none;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

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

/* =============================================================================
   Stats Bar
   ============================================================================= */

.stats-bar {
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    background: var(--color-bg-secondary);
}

.stats-grid {
    display: flex;
    gap: var(--spacing-xl);
}

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

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* =============================================================================
   Buttons
   ============================================================================= */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    background: transparent;
    color: var(--color-text);
    text-decoration: none;
}

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

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

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

.btn-ghost {
    border-color: transparent;
}

.btn-ghost:hover {
    background: var(--color-bg-tertiary);
}

.text-danger {
    color: var(--color-danger);
}

.text-danger:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* =============================================================================
   Main Layout
   ============================================================================= */

.main {
    min-height: calc(100vh - 140px);
}

.main .container {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}

/* =============================================================================
   Sidebar
   ============================================================================= */

.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.sidebar-section {
    margin-bottom: var(--spacing-lg);
}

.sidebar-section h3 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.nav-item {
    text-align: left;
    padding: var(--spacing-sm) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.nav-item:hover,
.nav-item.active {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.tag:hover {
    background: var(--color-border);
    color: var(--color-text);
}

/* =============================================================================
   Conversation List
   ============================================================================= */

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

.conversation-item {
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.conversation-item:hover {
    border-color: var(--color-primary);
    background: var(--color-bg-secondary);
}

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

.conv-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text);
}

.conv-meta {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.platform-badge {
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.platform-badge.chatgpt { background: #10a37f; color: white; }
.platform-badge.claude { background: #cc785c; color: white; }
.platform-badge.gemini { background: #4285f4; color: white; }
.platform-badge.perplexity { background: #1e88e5; color: white; }
.platform-badge.copilot { background: #000; color: white; }
.platform-badge.other { background: var(--color-bg-tertiary); color: var(--color-text-secondary); }

.conv-preview {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    line-height: 1.5;
}

.conv-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

.conv-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.conv-date {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* =============================================================================
   Detail Panel
   ============================================================================= */

.detail-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    max-width: 700px;
    height: 100vh;
    background: var(--color-bg);
    border-left: 1px solid var(--color-border);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.2s ease;
    z-index: 200;
}

.detail-panel.visible {
    transform: translateX(0);
}

.detail-header {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    z-index: 10;
}

.detail-content {
    padding: var(--spacing-lg);
}

.detail-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.detail-body {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* =============================================================================
   Empty State
   ============================================================================= */

.empty-state {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--color-text-secondary);
}

.empty-state svg {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.empty-state h2 {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    max-width: 400px;
    margin: 0 auto var(--spacing-md);
}

/* =============================================================================
   Search Overlay
   ============================================================================= */

.search-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    z-index: 300;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
}

.search-container {
    width: 100%;
    max-width: 600px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.search-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.search-header input {
    flex: 1;
    background: transparent;
    border: none;
    font-size: 1.125rem;
    color: var(--color-text);
    outline: none;
}

.search-results {
    max-height: 400px;
    overflow-y: auto;
}

.search-result-item {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    cursor: pointer;
}

.search-result-item:hover {
    background: var(--color-bg-secondary);
}

.search-result-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.search-result-preview {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* =============================================================================
   Modal
   ============================================================================= */

.modal {
    position: fixed;
    inset: 0;
    z-index: 400;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

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

.modal-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
}

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

/* =============================================================================
   Forms
   ============================================================================= */

.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.875rem;
    color: var(--color-text);
    transition: var(--transition);
}

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

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
}

/* =============================================================================
   Toast Notifications
   ============================================================================= */

.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 500;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    animation: slideIn 0.2s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toast.success { border-color: var(--color-success); }
.toast.error { border-color: var(--color-danger); }
.toast.info { border-color: var(--color-primary); }

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* =============================================================================
   Utilities
   ============================================================================= */

.hidden {
    display: none !important;
}

/* =============================================================================
   Responsive
   ============================================================================= */

@media (max-width: 768px) {
    .main .container {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .stats-grid {
        gap: var(--spacing-md);
    }

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

    .detail-panel {
        max-width: 100%;
    }
}