:root {
    --bg-main: #050505;
    --bg-panel: #121214;
    --card-border: rgba(255, 255, 255, 0.08);
    --primary: #00ff41; /* Matrix Green */
    --text-main: #ffffff;
    --text-muted: #888888;
    
    --font-mono: 'JetBrains Mono', monospace;
    --font-sans: 'Inter', sans-serif;
}

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

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

.app-container {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background: var(--bg-panel);
    border-right: 1px solid var(--card-border);
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
    gap: 30px;
    box-shadow: 10px 0 30px rgba(0,0,0,0.5);
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--primary);
    font-size: 1.2rem;
    font-weight: 700;
    font-family: var(--font-mono);
    text-shadow: 0 0 15px rgba(0, 255, 65, 0.4);
}

.control-group h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Buttons */
.btn {
    padding: 12px 20px;
    border-radius: 8px;
    font-family: var(--font-sans);
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    border: none;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary);
    color: #000;
    box-shadow: 0 4px 15px rgba(0, 255, 65, 0.2);
}
.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 255, 65, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border: 1px solid var(--card-border);
}
.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
}

.btn-sm {
    padding: 6px 10px;
    font-size: 0.75rem;
    flex: 1;
}

.text-input {
    width: 100%;
    background: rgba(0,0,0,0.4);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 10px 15px;
    color: var(--text-main);
    font-family: var(--font-mono);
    outline: none;
    letter-spacing: 2px;
    transition: 0.2s;
    margin-bottom: 8px;
}
.text-input:focus {
    border-color: var(--primary);
}

.preset-btns {
    display: flex;
    gap: 8px;
}

/* Sliders */
.slider-container {
    margin-bottom: 15px;
}
.slider-container label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 8px;
    color: var(--text-main);
}
input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    height: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
    outline: none;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 255, 65, 0.5);
}

/* Themes */
.theme-toggles {
    display: flex;
    background: rgba(0,0,0,0.3);
    border-radius: 8px;
    padding: 4px;
    border: 1px solid var(--card-border);
}
.btn-theme {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.85rem;
    transition: 0.2s;
}
.btn-theme.active {
    background: var(--primary);
    color: #000;
}

/* Main Content (ASCII Viewer) */
.main-content {
    flex: 1;
    background: var(--bg-main);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.ascii-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden; /* Prevent scrollbars from popping */
}

pre#ascii-output {
    font-family: var(--font-mono);
    line-height: 1;
    letter-spacing: 2px;
    white-space: pre;
    text-align: center;
    transition: color 0.3s;
    /* Transform scaled dynamically in JS to fit screen */
}

/* Theme Classes applied to PRE */
.theme-matrix {
    color: var(--primary);
    text-shadow: 0 0 5px rgba(0, 255, 65, 0.5);
}
.theme-bw {
    color: #ffffff;
}
.theme-color {
    /* Color mode handled via inline spans in JS */
    color: #ffffff;
}