:root {
    --bg-base: #0f111a;
    --panel-bg: rgba(30, 30, 46, 0.6);
    --panel-border: rgba(255, 255, 255, 0.08);
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --accent: #8b5cf6;
    --accent-hover: #7c3aed;
    --input-bg: rgba(15, 17, 26, 0.6);
}

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

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-base);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(139, 92, 246, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(56, 189, 248, 0.15), transparent 25%);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
    line-height: 1.5;
}

.app-container {
    width: 100%;
    max-width: 1400px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    animation: fadeInDown 0.8s ease-out;
}

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

.logo svg {
    color: var(--accent);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 300;
}

.workspace {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: start;
    animation: fadeIn 1s ease-out;
}



.panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    padding: 1.5rem;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.panel:hover {
    box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.6);
}

.controls-panel {
    position: static;
}

.preview-panel {
    min-height: 600px;
}

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

.preview-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group {
    flex-grow: 1;
}

label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.ascii-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: 0.5rem;
}

.char-btn {
    background: var(--input-bg);
    border: 1px solid var(--panel-border);
    color: var(--text-primary);
    border-radius: 6px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Fira Code', monospace;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
}

.char-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
    transform: translateY(-2px);
}

.char-btn:active {
    transform: translateY(1px);
}

textarea {
    width: 100%;
    height: 250px;
    background: var(--input-bg);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    padding: 1rem;
    color: var(--text-primary);
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    resize: vertical;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.advanced-settings {
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.settings-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
    outline: none;
    transition: background 0.2s;
}

.settings-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
}

.settings-toggle .chevron {
    color: var(--text-secondary);
    transition: transform 0.3s ease, color 0.3s ease;
}

.settings-toggle::-webkit-details-marker {
    display: none;
}

.advanced-settings[open] .settings-toggle {
    border-bottom: 1px solid var(--panel-border);
    background: rgba(0, 0, 0, 0.2);
}

.advanced-settings[open] .settings-toggle .chevron {
    color: var(--accent);
    transform: rotate(90deg);
}

.advanced-settings[open] .settings-grid {
    padding: 1.25rem;
    animation: fadeIn 0.3s ease-out;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

input[type="number"], select {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 0.6rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

input[type="number"]:focus, select:focus {
    border-color: var(--accent);
}

input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 100%;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    background: none;
    padding: 0;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: 1px solid var(--panel-border);
    border-radius: 8px;
}

.primary-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.6rem 1.2rem;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    outline: none;
}

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

.primary-btn:active {
    transform: translateY(2px);
}

.canvas-container {
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    border: 1px dashed var(--panel-border);
    overflow: hidden;
    padding: 1rem;
    position: relative;
}

canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    transition: opacity 0.3s ease;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-base); 
}

::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2); 
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.3); 
}

/* =========================================
   Responsive Design
   ========================================= */

@media (max-width: 968px) {
    .workspace {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .controls-panel {
        position: static;
    }
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    .app-container {
        gap: 1.5rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .panel {
        padding: 1.25rem;
        gap: 1.25rem;
    }
    
    .preview-panel {
        min-height: 400px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 0.75rem;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .preview-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .primary-btn {
        width: 100%;
        justify-content: center;
    }
    
    textarea {
        height: 180px;
    }
    
    .panel {
        padding: 1rem;
        border-radius: 16px;
    }
    
    .canvas-container {
        padding: 0.5rem;
    }
}