:root {
    /* Dimensions & Spacing */
    --header-height: 64px;
    --sidebar-width: 260px;
    --list-width: 350px;

    /* Light Theme Colors (Default) */
    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    --bg-hover: #f1f5f9;
    --border-color: #e2e8f0;

    --text-main: #0f172a;
    --text-muted: #64748b;

    /* Brand Navy & Gold */
    --navy: #1e3a5f;
    --accent: #b8860b;
    /* Dark gold */
    --accent-light: #dac386;
    --accent-hover: #9c7308;

    /* Tag colors */
    --tag-bg: #e0f2fe;
    --tag-text: #0369a1;
    --tag-jurisdiction-bg: #f3e8ff;
    --tag-jurisdiction-text: #7e22ce;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);

    --font-ui: 'Inter', system-ui, sans-serif;
    --font-legal: 'Georgia', serif;
}

[data-theme="dark"] {
    --bg-main: #020617;
    --bg-surface: #0f172a;
    --bg-hover: #1e293b;
    --border-color: #334155;

    --text-main: #f8fafc;
    --text-muted: #94a3b8;

    --navy: #0f172a;
    /* Blends into dark app surface */
    --accent: #d4af37;
    /* Lighter gold for dark mode */

    --tag-bg: #0c4a6e;
    --tag-text: #7dd3fc;
    --tag-jurisdiction-bg: #3b0764;
    --tag-jurisdiction-text: #d8b4fe;

    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: var(--font-ui);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Typography Classes */
.text-accent {
    color: var(--accent);
}

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

.ui-font {
    font-family: var(--font-ui);
}

/* Disclaimer Banner */
.disclaimer {
    background-color: #fef9c3;
    color: #854d0e;
    text-align: center;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    border-bottom: 1px solid #fde047;
    z-index: 100;
}

[data-theme="dark"] .disclaimer {
    background-color: #422006;
    color: #fef08a;
    border-bottom: 1px solid #713f12;
}

/* Header */
.top-nav {
    height: var(--header-height);
    background-color: var(--navy);
    color: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    box-shadow: var(--shadow-sm);
    z-index: 50;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: var(--sidebar-width);
}

.brand h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    margin: 0;
}

.search-bar {
    flex: 1;
    max-width: 500px;
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 12px;
    color: #94a3b8;
}

#inp-search {
    width: 100%;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    border-radius: 6px;
    border: 1px solid transparent;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    font-family: var(--font-ui);
    transition: all 0.2s;
}

#inp-search::placeholder {
    color: #cbd5e1;
}

#inp-search:focus {
    background-color: var(--bg-surface);
    color: var(--text-main);
    outline: none;
    border-color: var(--accent);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 500;
    font-family: var(--font-ui);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
}

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

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

.btn-outline {
    background-color: transparent;
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: white;
}

.btn-danger {
    background-color: #fee2e2;
    color: #dc2626;
    border-color: #fecaca;
}

.btn-danger:hover {
    background-color: #fca5a5;
}

[data-theme="dark"] .btn-danger {
    background-color: #7f1d1d;
    color: #fecaca;
    border-color: #991b1b;
}

.btn-icon {
    background: transparent;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 0.4rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

#btn-theme {
    color: white;
}

/* Main App Layout */
.app-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem;
    overflow-y: auto;
    flex-shrink: 0;
}

.filter-group h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.mt-4 {
    margin-top: 1.5rem;
}

.mt-2 {
    margin-top: 0.75rem;
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.nav-menu li {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color 0.2s;
}

.nav-menu li:hover {
    background-color: var(--bg-hover);
}

.nav-menu li.active {
    background-color: var(--bg-hover);
    color: var(--accent);
}

.nav-menu li.active svg {
    color: var(--accent);
}

.input-select,
.input-text {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-surface);
    color: var(--text-main);
    outline: none;
}

.input-select:focus,
.input-text:focus {
    border-color: var(--accent);
}

.input-select.small {
    padding: 0.25rem;
    font-size: 0.8rem;
    width: auto;
}

.category-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.category-list li {
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
}

.category-list li:hover {
    background-color: var(--bg-hover);
    color: var(--text-main);
}

.category-list li.active {
    background-color: var(--bg-hover);
    font-weight: 600;
    color: var(--text-main);
    border-left: 3px solid var(--accent);
}

.category-list .count {
    font-size: 0.75rem;
    background: var(--bg-main);
    padding: 0.1rem 0.4rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

/* Center List Panel */
.list-panel {
    width: var(--list-width);
    background-color: var(--bg-main);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.list-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    background-color: var(--bg-surface);
}

.clause-list {
    flex: 1;
    overflow-y: auto;
}

.clause-item {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    background-color: var(--bg-surface);
    transition: background-color 0.2s;
}

.clause-item:hover {
    background-color: var(--bg-hover);
}

.clause-item.selected {
    background-color: var(--bg-hover);
    border-left: 3px solid var(--accent);
    padding-left: calc(1.5rem - 3px);
}

.cl-cat {
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.25rem;
}

.cl-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    line-height: 1.3;
}

.cl-preview {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Right Detail Panel */
.detail-panel {
    flex: 1;
    background-color: var(--bg-surface);
    position: relative;
    overflow-y: auto;
}

.empty-state {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    gap: 1rem;
}

.detail-content {
    padding: 2rem 3rem;
    max-width: 800px;
    margin: 0 auto;
}

.detail-content.hidden {
    display: none;
}

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

.tags-container {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.badge {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-weight: 500;
}

.badge.cat {
    background-color: var(--tag-bg);
    color: var(--tag-text);
}

.badge.jur {
    background-color: var(--tag-jurisdiction-bg);
    color: var(--tag-jurisdiction-text);
}

#detail-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.detail-actions {
    display: flex;
    gap: 0.5rem;
    color: var(--text-muted);
}

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

.detail-actions .btn-icon.favorited svg {
    fill: var(--accent);
    color: var(--accent);
}

.detail-explanation {
    background-color: var(--bg-hover);
    padding: 1.25rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border-left: 4px solid var(--accent);
}

.detail-explanation strong {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-muted);
}

.detail-text-container {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.detail-text {
    font-family: var(--font-legal);
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-main);
    white-space: pre-wrap;
}

.detail-footer {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* Modals */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.hidden {
    display: none;
}

.modal {
    background-color: var(--bg-surface);
    width: 100%;
    max-width: 600px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

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

.modal-body {
    padding: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-main);
}

.form-row {
    display: flex;
    gap: 1rem;
}

.flex-1 {
    flex: 1;
}

.modal-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    background: var(--bg-main);
}

.modal-footer .btn-outline {
    color: var(--text-main);
    border-color: var(--border-color);
}

.modal-footer .btn-outline:hover {
    background-color: var(--bg-hover);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--text-main);
    color: var(--bg-surface);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

@media (max-width: 1024px) {
    .sidebar {
        width: 220px;
    }

    .list-panel {
        width: 300px;
    }
}

@media (max-width: 768px) {
    .app-layout {
        flex-direction: column;
        overflow: visible;
        height: auto;
    }

    .sidebar,
    .list-panel,
    .detail-panel {
        width: 100%;
        height: auto;
        border-right: none;
    }

    .list-panel {
        border-bottom: 1px solid var(--border-color);
        max-height: 400px;
    }

    .brand h1 {
        display: none;
    }

    .search-bar {
        margin: 0 1rem;
    }
}