/* OPTIMIZED BUILD */
:root {
    --color-primary: #00D8FF;
    --color-primary-dark: #155A8A;
    --color-accent: #FF6600;
    --color-bg: #0a0a0c;
    --color-surface: rgba(20, 24, 30, 0.85);
    --color-text: #f0f0f0;
    --color-text-secondary: #a0a0a8;
    --color-border: rgba(255, 255, 255, 0.1);
    
    --font-primary: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --radius-md: 8px;
    --space-4: 1rem;
}

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

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

.app-container {
    position: relative;
    z-index: 10;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* NAVBAR */
.navbar {
    height: 64px;
    background: var(--color-surface);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
}

.logo { font-weight: 800; letter-spacing: -1px; font-size: 1.25rem; }
.logo span { color: var(--color-primary); }

/* EDITOR LAYOUT */
.editor-shell {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.toolbar {
    width: 280px;
    background: var(--color-surface);
    backdrop-filter: blur(12px);
    border-right: 1px solid var(--color-border);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.tool-group label {
    display: block;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.control { margin-bottom: 1rem; }
.control span { display: block; font-size: 12px; margin-bottom: 0.5rem; }
input[type="range"] {
    width: 100%;
    accent-color: var(--color-primary);
}

.canvas-area {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: radial-gradient(circle at center, rgba(0,0,0,0) 0%, rgba(0,0,0,0.4) 100%);
    position: relative;
}

#main-canvas {
    max-width: 100%;
    max-height: 100%;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    background-image: 
        linear-gradient(45deg, #222 25%, transparent 25%), 
        linear-gradient(-45deg, #222 25%, transparent 25%), 
        linear-gradient(45deg, transparent 75%, #222 75%), 
        linear-gradient(-45deg, transparent 75%, #222 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

/* COMPONENTS */
.btn {
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    font-size: 13px;
}
.btn-primary { background: var(--color-primary); color: #000; }
.btn-secondary { background: rgba(255,255,255,0.05); color: #fff; border: 1px solid var(--color-border); }
.btn-ghost { background: transparent; color: var(--color-primary); border: 1px solid var(--color-primary); }
.btn:hover { transform: translateY(-1px); filter: brightness(1.1); }
.btn:disabled { opacity: 0.3; cursor: not-allowed; }
.btn-full { width: 100%; }

.empty-state { color: var(--color-text-secondary); font-size: 0.9rem; border: 2px dashed var(--color-border); padding: 4rem; border-radius: 20px; text-align: center; }

.helix-powered {
    position: fixed;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
}
.helix-powered a {
    font-size: 10px;
    color: #999;
    opacity: 0.35;
    text-decoration: none;
    letter-spacing: 2px;
}

.hidden { display: none !important; }
.history-controls {
    display: flex;
    gap: 5px;
    background: rgba(255, 255, 255, 0.05);
    padding: 4px;
    border-radius: var(--radius-md);
    margin: 0 15px;
}

.btn-icon {
    background: transparent;
    border: none;
    color: white;
    font-size: 18px;
    cursor: pointer;
    padding: 0 8px;
    transition: all 0.2s;
}
.btn-icon:hover { color: var(--color-primary); }

.selection-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-bottom: 10px;
}

.tool-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 6px;
    border-radius: 4px;
    font-size: 11px;
    cursor: pointer;
}
.tool-btn.active { 
    border-color: var(--color-primary); 
    color: white; 
    background: rgba(0, 216, 255, 0.1); 
}

.color-picker-wrapper {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

#color-palette {
    width: 42px;
    height: 42px;
    border: none;
    background: none;
    cursor: pointer;
}

#hex-input {
    flex: 1;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: white;
    padding: 0 10px;
    font-family: var(--font-mono);
    font-size: 12px;
}

.btn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}