:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --border-color: #30363d;
    --accent: #58a6ff;
    --accent-hover: #1f6feb;
    --success: #2ea043;
    --danger: #f85149;
    --code-bg: #0d1117;
    --code-comment: #8b949e;
    --font-sans: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --radius: 8px;
}

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

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

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 32px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
}

.nav-brand h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.nav-brand svg {
    color: var(--text-primary);
}

.btn {
    padding: 8px 16px;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--success);
    color: #fff;
}

.btn-primary:hover {
    background-color: #2c974b;
}

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

.btn-outline:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--text-secondary);
}

/* Layout */
.container {
    display: grid;
    grid-template-columns: 450px 1fr;
    gap: 24px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px 32px;
    flex: 1;
    width: 100%;
}

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 24px;
}

h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 12px;
    margin-top: 24px;
}

/* Search */
.search-container {
    position: relative;
    margin-bottom: 16px;
}

#search-input {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

#search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.3);
}

.autocomplete-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-top: 4px;
    max-height: 250px;
    overflow-y: auto;
    z-index: 50;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    display: none;
}

.autocomplete-dropdown.active {
    display: block;
}

.dropdown-item {
    padding: 10px 16px;
    cursor: pointer;
    font-size: 0.875rem;
}

.dropdown-item:hover,
.dropdown-item.focused {
    background-color: var(--accent-hover);
    color: #fff;
}

/* Tags */
.selected-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: 38px;
}

.tag {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.tag-remove {
    cursor: pointer;
    color: var(--text-secondary);
    font-weight: bold;
    font-size: 0.9rem;
}

.tag-remove:hover {
    color: var(--danger);
}

/* Presets */
.preset-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.btn-preset {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--accent);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-preset:hover {
    background: var(--bg-tertiary);
    border-color: var(--text-secondary);
}

/* Custom Rules */
.custom-rules {
    flex: 1;
    display: flex;
    flex-direction: column;
}

#custom-textarea {
    flex: 1;
    min-height: 150px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    padding: 12px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    resize: vertical;
    outline: none;
}

#custom-textarea:focus {
    border-color: var(--accent);
}

/* Preview Panel */
.preview-panel {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.preview-header h2 {
    font-size: 1.125rem;
}

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

.preview-content {
    flex: 1;
    overflow: auto;
    position: relative;
    background: var(--code-bg);
}

pre {
    margin: 0;
    padding: 24px;
}

code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    white-space: pre;
}

.syn-comment {
    color: var(--code-comment);
}

.syn-match {
    color: var(--text-primary);
}

#loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(22, 27, 34, 0.9);
    padding: 16px 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    color: var(--accent);
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(88, 166, 255, 0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.hidden {
    display: none !important;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    width: 500px;
    max-width: 90vw;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

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

.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.history-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: var(--radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-tags {
    font-size: 0.85rem;
    color: var(--accent);
    margin-bottom: 4px;
}

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

.history-actions button {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
}

.history-actions button:hover {
    border-color: var(--text-secondary);
}

.text-muted {
    color: var(--text-secondary);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--success);
    color: white;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 500;
    font-size: 0.875rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

@media (max-width: 900px) {
    .container {
        grid-template-columns: 1fr;
    }

    .card,
    .preview-panel {
        min-height: 500px;
    }
}