/* ==========================================================================
   1. Reset & Variables
   ========================================================================== */
:root {
    --bg-dark: #12131a;
    --bg-pane: #1a1c23;
    --bg-input: #222530;
    --border-color: #2d3142;
    
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    
    --accent-por: #3b82f6; /* Blue */
    --accent-c: #10b981;   /* Green */
    --accent-primary: #6366f1; /* Indigo */
    
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', Courier, monospace;
}

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

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

/* ==========================================================================
   2. Layout Components (Header, Nav, Footer)
   ========================================================================== */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--bg-pane);
    border-bottom: 1px solid var(--border-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo h1 span {
    color: var(--accent-primary);
}

.app-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
}

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

.nav-btn.active {
    color: var(--text-main);
    background-color: var(--bg-input);
    border-color: var(--border-color);
}

.app-content {
    flex: 1;
    padding: 2rem;
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
}

.app-footer {
    text-align: center;
    padding: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-pane);
}

/* ==========================================================================
   3. Screens & Grid Panels
   ========================================================================== */
.screen-view {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.screen-header {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.screen-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

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

/* The Core Split Screen */
.split-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 1.5rem;
    align-items: stretch;
}

.pane {
    background-color: var(--bg-pane);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
}

.pane-header {
    background-color: var(--bg-dark);
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.file-name {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Badges */
.badge {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

.badge-por {
    background-color: rgba(59, 130, 246, 0.15);
    color: var(--accent-por);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge-c {
    background-color: rgba(16, 185, 129, 0.15);
    color: var(--accent-c);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

/* ==========================================================================
   4. Code Views & Forms
   ========================================================================== */
.code-display, 
.code-input, 
.code-output {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.6;
    padding: 1.25rem;
    flex: 1;
    overflow: auto;
    white-space: pre;
}

/* Static Displays */
.code-display {
    color: #e2e8f0;
}

/* Interactive Input / Output Areas */
.code-input {
    background-color: var(--bg-input);
    color: var(--text-main);
    border: none;
    outline: none;
    resize: none;
    min-height: 400px;
}

.code-input:focus {
    box-shadow: inset 0 0 0 1px var(--border-color);
}

/* Empty placeholder styling for contenteditable */
.code-input:empty::before {
    content: attr(placeholder);
    color: var(--text-muted);
}

.code-output {
    background-color: rgba(0, 0, 0, 0.15);
    color: var(--text-muted);
    min-height: 400px;
}

/* Buttons inside Panes */
.action-btn {
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.action-btn:hover {
    background-color: var(--border-color);
}

.action-btn.primary {
    background-color: var(--accent-primary);
    border-color: transparent;
}

.action-btn.primary:hover {
    filter: brightness(1.1);
}

/* ==========================================================================
   5. Utilities & Responsiveness
   ========================================================================== */
.d-none {
    display: none !important;
}

@media (max-width: 768px) {
    .app-content {
        padding: 1rem;
    }
    
    .split-container {
        grid-template-columns: 1fr;
    }
}