:root {
    /* --- Cyber-Industrial Palette --- */
    --c-bg-main: #050505;
    --c-bg-panel: #0a0a0a;
    --c-bg-input: #080808;
    
    --c-accent: #00F0FF;     /* Cyan Neon */
    --c-accent-glow: rgba(0, 240, 255, 0.4);
    --c-secondary: #FFD700;  /* Gold/Amber */
    --c-danger: #FF2A6D;     /* Neon Red */
    --c-success: #05FFA1;    /* Neon Green */

    --c-text-main: #EAEAEA;
    --c-text-dim: #555555;
    --c-text-label: #888888;
    
    --c-border: #222222;
    --c-border-active: #444444;
    --c-grid: rgba(255, 255, 255, 0.03);

    /* --- Syntax Highlighting --- */
    --json-key: #00F0FF;
    --json-string: #EAEAEA;
    --json-number: #FFD700;
    --json-boolean: #FF2A6D;
    --json-null: #777777;
    --json-bracket: #444444;
    
    /* --- Typography --- */
    --font-ui: 'Archivo', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* --- Dimensions --- */
    --header-height: 64px;
    --panel-header-height: 48px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
}

* { box-sizing: border-box; outline: none; }

body {
    margin: 0;
    padding: 0;
    background-color: var(--c-bg-main);
    color: var(--c-text-main);
    font-family: var(--font-ui);
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --- Layout Background --- */
.bg-grid {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-image: 
        linear-gradient(var(--c-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--c-grid) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}

.app-container {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 1920px;
    margin: 0 auto;
}

/* --- Header --- */
.app-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    border-bottom: 1px solid var(--c-border);
    background: rgba(5, 5, 5, 0.8);
    backdrop-filter: blur(8px);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--c-accent);
    color: var(--c-bg-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-family: var(--font-mono);
    clip-path: polygon(0 0, 100% 0, 100% 75%, 75% 100%, 0 100%);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    margin: 0;
    text-transform: uppercase;
}

.logo .accent-text {
    color: var(--c-accent);
    font-weight: 400;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-right: var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--c-accent);
}

.status-dot {
    width: 6px;
    height: 6px;
    background-color: var(--c-accent);
    box-shadow: 0 0 8px var(--c-accent);
}

.github-link {
    color: var(--c-text-dim);
    transition: color 0.2s;
}
.github-link:hover { color: var(--c-text-main); }

/* --- Main Content --- */
.main-content {
    flex: 1;
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    overflow: hidden;
}

.panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--c-bg-panel);
    border: 1px solid var(--c-border);
    overflow: hidden;
    position: relative;
}

.panel::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 4px; height: 100%;
    background: var(--c-border);
    opacity: 0.5;
}

.input-panel::before { background: var(--c-secondary); }
.viewer-panel::before { background: var(--c-accent); }

/* --- Panel Header --- */
.panel-header {
    height: var(--panel-header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md) 0 var(--spacing-lg); /* Extra padding left for border */
    border-bottom: 1px solid var(--c-border);
    background: var(--c-bg-input);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-mono);
}

.panel-icon {
    font-size: 0.75rem;
    color: var(--c-text-dim);
    border: 1px solid var(--c-border);
    padding: 2px 4px;
}

.panel-header h2 {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    margin: 0;
    color: var(--c-text-main);
    text-transform: uppercase;
}

/* --- Actions --- */
.actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn {
    appearance: none;
    border: 1px solid var(--c-border-active);
    background: transparent;
    color: var(--c-text-label);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    padding: 6px 16px;
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 0.05em;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    color: var(--c-text-main);
    border-color: var(--c-text-main);
    background: rgba(255, 255, 255, 0.02);
}

.btn-primary {
    border-color: var(--c-accent);
    color: var(--c-accent);
}

.btn-primary:hover {
    background: var(--c-accent);
    color: var(--c-bg-main);
    box-shadow: 0 0 15px var(--c-accent-glow);
}

.btn-danger:hover {
    border-color: var(--c-danger);
    color: var(--c-danger);
}

.btn-icon {
    padding: 6px;
    border: none;
    color: var(--c-text-dim);
}
.btn-icon:hover { color: var(--c-text-main); }

.btn-sm {
    padding: 4px 12px;
    font-size: 0.7rem;
}

/* --- Editors --- */
.editor-container, .viewer-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: var(--c-bg-panel);
}

#json-input {
    width: 100%;
    height: 100%;
    background: transparent;
    border: none;
    color: var(--c-text-main);
    font-family: var(--font-mono);
    font-size: 13px;
    padding: var(--spacing-lg); /* Padding to clear side border */
    resize: none;
    line-height: 1.6;
}
#json-input::placeholder { color: var(--c-text-dim); opacity: 0.5; }

/* --- Viewer Tree --- */
.viewer-container {
    padding-left: var(--spacing-sm); /* Offset for tree lines */
}

#json-viewer {
    width: 100%;
    height: 100%;
    overflow: auto;
    padding: var(--spacing-md);
    padding-left: var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.8;
}

/* Tree Nodes */
.json-node {
    margin-left: 1px; /* Align with border maybe? */
}

.collapsible {
    cursor: pointer;
    display: inline-block;
    position: relative;
    padding-left: 20px;
}

.collapsible::after {
    content: '';
    position: absolute;
    left: 8px;
    top: 50%;
    width: 6px;
    height: 6px;
    border-right: 2px solid var(--c-text-dim);
    border-bottom: 2px solid var(--c-text-dim);
    transform: translateY(-70%) rotate(45deg);
    transition: transform 0.15s;
}

.collapsible.collapsed::after {
    transform: translateY(-50%) rotate(-45deg);
}

.collapsible-content {
    margin-left: 9px;
    padding-left: 10px;
    border-left: 1px solid var(--c-border);
    overflow: hidden;
}
.collapsible-content:hover { border-left-color: var(--c-border-active); }

.collapsible.collapsed + .collapsible-content { display: none; }

.json-key { color: var(--json-key); }
.json-string { color: var(--json-string); }
.json-number { color: var(--json-number); }
.json-boolean { color: var(--json-boolean); }
.json-null { color: var(--json-null); font-style: italic; }
.json-bracket { color: var(--json-bracket); }

/* --- Search --- */
.search-box {
    display: flex;
    align-items: center;
    background: var(--c-bg-input);
    border: 1px solid var(--c-border);
    margin: 0 var(--spacing-md);
    height: 32px;
    width: 240px;
}
.search-box:focus-within { border-color: var(--c-accent); }

.search-icon { margin-left: 8px; color: var(--c-text-dim); }

#search-input {
    background: transparent;
    border: none;
    color: var(--c-text-main);
    width: 100%;
    height: 100%;
    padding: 0 8px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
}
#search-input::placeholder { color: var(--c-text-dim); }

/* --- Footer --- */
.panel-footer {
    height: 40px;
    border-top: 1px solid var(--c-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md) 0 var(--spacing-lg);
    background: var(--c-bg-input);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--c-text-dim);
}

.footer-stat .value { color: var(--c-accent); margin-left: 4px; }
.footer-actions { display: flex; gap: 8px; }

/* --- Empty State --- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--c-text-dim);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.grid-animation {
    width: 60px;
    height: 60px;
    border: 1px solid var(--c-border);
    margin-bottom: var(--spacing-md);
    position: relative;
}
.grid-animation::before {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 20px; height: 20px;
    background: var(--c-accent);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 0.2; box-shadow: 0 0 0 0 rgba(0, 240, 255, 0.4); }
    70% { opacity: 1; box-shadow: 0 0 0 10px rgba(0, 240, 255, 0); }
    100% { opacity: 0.2; box-shadow: 0 0 0 0 rgba(0, 240, 255, 0); }
}

/* --- Error Toast --- */
.error-toast {
    position: absolute;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    background: rgba(255, 42, 109, 0.1);
    border-left: 2px solid var(--c-danger);
    color: var(--c-danger);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    backdrop-filter: blur(4px);
    transition: opacity 0.3s;
}

.hidden { display: none; }

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--c-bg-main); }
::-webkit-scrollbar-thumb { background: var(--c-border-active); }
/* --- Dynamic JS Elements --- */
.json-count {
    color: var(--c-text-dim);
    font-size: 0.8em;
    margin-left: 8px;
    font-style: italic;
}

.json-line {
    padding-left: 20px;
}

.json-block-footer {
    padding-left: 20px;
    color: var(--json-bracket);
}