:root {
    /* Light Theme */
    --bg: #F8FAFC;
    --surface: #FFFFFF;
    --surface-hover: #F1F5F9;
    --border: #E2E8F0;
    
    --text-main: #0F172A;
    --text-muted: #64748B;
    
    --primary: #3B82F6;
    --primary-hover: #2563EB;
    
    --critical: #EF4444;
    --warning: #F59E0B;
    --info: #3B82F6;
    --success: #10B981;

    --critical-bg: #FEE2E2;
    --warning-bg: #FEF3C7;
    --info-bg: #EFF6FF;

    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    
    --font-sans: 'Inter', system-ui, sans-serif;
    --font-mono: 'Fira Code', monospace;
    --transition: 0.2s ease;
}

[data-theme="dark"] {
    /* Dark Theme */
    --bg: #0B0F19;
    --surface: #1E293B;
    --surface-hover: #334155;
    --border: #334155;
    
    --text-main: #F1F5F9;
    --text-muted: #94A3B8;

    --primary: #60A5FA;
    --primary-hover: #3B82F6;

    --critical-bg: rgba(239, 68, 68, 0.15);
    --warning-bg: rgba(245, 158, 11, 0.15);
    --info-bg: rgba(59, 130, 246, 0.15);

    --shadow-sm: 0 4px 6px rgba(0,0,0,0.3);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.5);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.5);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition), color var(--transition);
}

/* Typography & Utils */
h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.2; }
.hidden { display: none !important; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
}

.btn-icon {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.btn-clear {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.25rem;
}
.btn-clear:hover { color: var(--text-main); }

.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.75rem; }
.btn-text { background: transparent; color: var(--text-muted); padding: 0; border: none; }
.btn-text:hover { color: var(--primary); text-decoration: underline; }

.btn-outline {
    background: transparent;
    border-color: var(--border);
    color: var(--text-main);
}
.btn-outline:hover { background: var(--surface-hover); }

/* Header */
.app-header {
    height: 64px;
    background: rgba(var(--surface-rgb), 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 50;
}

:root:not([data-theme="dark"]) .app-header { background: rgba(255, 255, 255, 0.85); }
[data-theme="dark"] .app-header { background: rgba(30, 41, 59, 0.85); }

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
}
.logo h1 { font-size: 1.25rem; color: var(--text-main); letter-spacing: -0.02em; }
.logo span { font-weight: 400; color: var(--text-muted); }

/* Layout */
.app-layout {
    flex: 1;
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    padding: 2rem 1.5rem;
    gap: 2rem;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    min-width: 0;
}

.sidebar {
    width: 280px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

@media (max-width: 800px) {
    .app-layout { flex-direction: column; }
    .sidebar { width: 100%; order: -1; flex-direction: row; flex-wrap: wrap; }
    .sidebar-card { flex: 1; min-width: 250px; }
}

/* Hero Search */
.hero-search {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.hero-search h2 {
    font-size: 1.75rem;
    letter-spacing: -0.02em;
}

.search-bar {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.search-icon {
    position: absolute;
    left: 1rem;
    color: var(--text-muted);
}

#searchInput {
    width: 100%;
    padding: 1.25rem 3rem;
    font-size: 1.125rem;
    font-family: var(--font-sans);
    color: var(--text-main);
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    outline: none;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

#searchInput:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.search-bar .btn-clear {
    position: absolute;
    right: 1rem;
}

/* Filters */
.filters {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.4rem 0.85rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    background: var(--surface-hover);
    color: var(--text-main);
}
.filter-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* Results Area */
.results-header {
    margin-bottom: 1rem;
}
#resultsCount {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-muted);
}

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

/* Error Card */
.error-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.error-card::before {
    content: '';
    position: absolute;
    left: 0; top: 0; width: 4px; height: 100%;
    background: var(--text-muted);
    transition: var(--transition);
}
.error-card.severity-critical::before { background: var(--critical); }
.error-card.severity-warning::before { background: var(--warning); }
.error-card.severity-info::before { background: var(--info); }

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

.card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.badge {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    background: var(--surface-hover);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.card-code {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-main);
}

.card-message {
    font-size: 0.95rem;
    color: var(--text-main);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Sidebar */
.sidebar-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

.sidebar-card h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-main);
    margin-bottom: 1rem;
}
.sidebar-card h3 svg { color: var(--primary); }

.meta-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.meta-list li {
    font-size: 0.875rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    background: var(--surface-hover);
    border: 1px solid transparent;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.meta-list li .meta-code {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-main);
}
.meta-list li:hover { border-color: var(--border); background: var(--bg); }
.meta-list li.empty-msg {
    background: transparent;
    color: var(--text-muted);
    cursor: default;
    padding: 0;
    font-style: italic;
    font-size: 0.85rem;
}
.meta-list li.empty-msg:hover { border-color: transparent; background: transparent; }

.remove-meta {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    opacity: 0;
    transition: var(--transition);
}
.meta-list li:hover .remove-meta { opacity: 1; }
.remove-meta:hover { color: var(--critical); }

/* Empty state */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
    background: var(--surface);
    border: 1px dashed var(--border);
    border-radius: var(--radius-lg);
}
.empty-state svg { margin-bottom: 1rem; opacity: 0.5; }

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(var(--bg-rgb), 0.8);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
    padding: 1rem;
}

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

.modal-container {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 650px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.show .modal-container {
    transform: translateY(0);
}

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

.modal-title { display: flex; flex-direction: column; gap: 0.5rem; align-items: flex-start; }
#modalCode { font-family: var(--font-mono); font-size: 1.5rem; }

.modal-actions { display: flex; gap: 0.5rem; }
.modal-actions .btn-icon.active { color: var(--warning); fill: var(--warning); }
.modal-actions .btn-icon.active svg { fill: var(--warning); stroke: var(--warning); }

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.severity-banner {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
}
.severity-banner.critical { background: var(--critical-bg); color: var(--critical); border: 1px solid rgba(239, 68, 68, 0.2); }
.severity-banner.warning { background: var(--warning-bg); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.2); }
.severity-banner.info { background: var(--info-bg); color: var(--info); border: 1px solid rgba(59, 130, 246, 0.2); }

.dt-title { font-size: 1rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.5rem;}
.dt-desc { font-size: 1rem; line-height: 1.6; }

.dt-list { list-style-position: inside; color: var(--text-main); line-height: 1.6; }
.dt-list li { margin-bottom: 0.4rem; }

.code-block {
    position: relative;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    overflow-x: auto;
}
.code-block pre { margin: 0; font-family: var(--font-mono); font-size: 0.9rem; color: var(--text-main); white-space: pre-wrap;}
.copy-code-btn {
    position: absolute;
    top: 0.5rem; right: 0.5rem;
    background: var(--surface);
}

/* Toast */
.toast {
    position: fixed;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-main);
    color: var(--bg);
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: bottom 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 2000;
    box-shadow: var(--shadow-md);
}
.toast.show { bottom: 2rem; }