:root {
    --bg-app: #0F172A;
    --bg-card: #1E293B;
    --bg-input: #0B1120;
    --bg-hover: #334155;

    --primary: #06B6D4;
    /* Cyan */
    --primary-hover: #0891B2;
    --accent: #EF4444;
    /* Red */
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --border: #334155;

    --diff-added-bg: rgba(16, 185, 129, 0.15);
    --diff-added-text: #34D399;
    --diff-removed-bg: rgba(239, 68, 68, 0.15);
    --diff-removed-text: #F87171;
    --diff-modified-bg: rgba(245, 158, 11, 0.15);
    --diff-modified-text: #FCD34D;

    --font-sans: 'Inter', system-ui, sans-serif;
    --font-mono: 'Fira Code', monospace;
    --radius: 12px;
}

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

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

.hidden {
    display: none !important;
}

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

.flex-fill {
    flex-grow: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.overflow-hidden {
    overflow: hidden;
}

.mb-2 {
    margin-bottom: 0.5rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

.mt-4 {
    margin-top: 1rem;
}

.mt-8 {
    margin-top: 2rem;
}

.pb-4 {
    padding-bottom: 1rem;
}

.border-bottom {
    border-bottom: 1px solid var(--border);
}

.full-width {
    width: 100%;
}

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

.fs-xs {
    font-size: 0.75rem;
}

.glass {
    background: rgba(30, 41, 59, 0.6);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Header */
.header {
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    border-bottom: 1px solid var(--border);
}

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

.brand h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

.actions {
    display: flex;
    gap: 1rem;
}

/* Main layout */
.main-content {
    flex-grow: 1;
    overflow: hidden;
    position: relative;
}

/* Input Phase */
.input-grid {
    display: flex;
    height: 100%;
    padding: 2rem;
    gap: 2rem;
    opacity: 0;
    pointer-events: none;
    position: absolute;
    inset: 0;
    transition: opacity 0.3s;
}

.input-grid.active {
    opacity: 1;
    pointer-events: auto;
}

@media (max-width: 900px) {
    .input-grid {
        flex-direction: column;
        overflow-y: auto;
    }
}

.card {
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.card-header {
    margin-bottom: 1.5rem;
}

.card-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

.url-input {
    display: flex;
    gap: 0.5rem;
}

.inp {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    outline: none;
    font-family: var(--font-sans);
    width: 100%;
    transition: border 0.2s;
}

.inp:focus {
    border-color: var(--primary);
}

.inp.sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
}

.code-editor {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: #E2E8F0;
    padding: 1rem;
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    resize: none;
    outline: none;
    flex-grow: 1;
    width: 100%;
}

.code-editor:focus {
    border-color: var(--primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-sans);
    font-weight: 500;
    border: none;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn.primary {
    background: var(--primary);
    color: #000;
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

.btn.primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn.secondary {
    background: rgba(6, 182, 212, 0.1);
    color: var(--primary);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.btn.secondary:hover {
    background: rgba(6, 182, 212, 0.2);
}

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

.btn.outline:hover:not(:disabled) {
    background: var(--bg-hover);
}

.btn.sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

.icon-btn {
    background: transparent;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

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


/* Result Phase */
.result-layout {
    display: flex;
    height: 100%;
    padding: 2rem;
    gap: 2rem;
    opacity: 0;
    pointer-events: none;
    position: absolute;
    inset: 0;
    transition: opacity 0.3s;
}

.result-layout.active {
    opacity: 1;
    pointer-events: auto;
}

.result-sidebar {
    width: 300px;
    flex: none;
    overflow-y: auto;
}

.result-main {
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.tree-container {
    flex-grow: 1;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    padding-right: 1rem;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.stat-box {
    padding: 1rem 0.5rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid transparent;
}

.stat-box.diff-added {
    background: var(--diff-added-bg);
    border-color: rgba(16, 185, 129, 0.3);
}

.stat-box.diff-added .stat-num {
    color: var(--diff-added-text);
}

.stat-box.diff-removed {
    background: var(--diff-removed-bg);
    border-color: rgba(239, 68, 68, 0.3);
}

.stat-box.diff-removed .stat-num {
    color: var(--diff-removed-text);
}

.stat-box.diff-modified {
    background: var(--diff-modified-bg);
    border-color: rgba(245, 158, 11, 0.3);
}

.stat-box.diff-modified .stat-num {
    color: var(--diff-modified-text);
}

.stat-num {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--text-muted);
}

.filters {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.filter-cb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--text-muted);
}

.filter-cb input {
    accent-color: var(--primary);
}

/* Tree rendering styles */
.tree-node {
    margin-left: 1.5rem;
    position: relative;
}

.tree-node::before {
    content: '';
    position: absolute;
    left: -1rem;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--border);
    pointer-events: none;
    opacity: 0.5;
}

.tree-line {
    display: flex;
    align-items: flex-start;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    margin-bottom: 2px;
}

.tree-line:hover {
    background: rgba(255, 255, 255, 0.03);
}

/* Line type modifiers */
.t-added {
    background: var(--diff-added-bg) !important;
    color: var(--diff-added-text);
}

.t-removed {
    background: var(--diff-removed-bg) !important;
    color: var(--diff-removed-text);
    text-decoration: line-through opacity(0.5);
}

.t-modified {
    background: var(--diff-modified-bg) !important;
}

.t-modified>span.mod-old {
    color: var(--diff-removed-text);
    text-decoration: line-through;
    margin-right: 0.5rem;
}

.t-modified>span.mod-new {
    color: var(--diff-added-text);
}

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

/* Hiding via filters */
.tree-node.f-hidden {
    display: none;
}

.tree-line.f-hidden {
    display: none;
}

.t-key {
    color: #8BE9FD;
    margin-right: 0.5rem;
    cursor: pointer;
    user-select: none;
}

.t-key:hover {
    text-decoration: underline;
}

.t-val-str {
    color: #F1FA8C;
}

.t-val-num {
    color: #BD93F9;
}

.t-val-bool {
    color: #FF79C6;
}

.t-val-null {
    color: var(--text-muted);
    font-style: italic;
}

.t-bracket {
    color: var(--text-main);
    cursor: pointer;
}

.t-bracket:hover {
    color: var(--primary);
}

.tree-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    margin-right: 4px;
    cursor: pointer;
    color: var(--text-muted);
    transition: transform 0.2s;
}

.tree-toggle.collapsed {
    transform: rotate(-90deg);
}

.tree-children.collapsed {
    display: none;
}

.type-badge {
    font-size: 0.65rem;
    background: var(--bg-input);
    padding: 0.1rem 0.3rem;
    border-radius: 4px;
    border: 1px solid var(--border);
    margin-left: 0.5rem;
    color: var(--text-muted);
}