:root { 
    --p: #6366f1; 
    --p-hover: #4f46e5;
    --bg: #0b0f1a; 
    --card: rgba(30, 41, 59, 0.7); 
    --text: #f8fafc; 
    --text-dim: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --success: #10b981; 
    --fail: #f43f5e; 
    --glass-bg: rgba(0, 0, 0, 0.2);
}

[data-theme="light"] {
    --bg: #f1f5f9;
    --card: rgba(255, 255, 255, 0.8);
    --text: #1e293b;
    --text-dim: #64748b;
    --border: rgba(0, 0, 0, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.5);
}

body {
    background-color: var(--bg);
    background-image: radial-gradient(circle at 2px 2px, var(--border) 1px, transparent 0);
    background-size: 40px 40px;
    color: var(--text);
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 60px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background-color 0.4s ease;
}

/* --- Header --- */
.app-header { text-align: center; margin-bottom: 40px; position: relative; width: 100%; max-width: 1300px; }
.app-header h1 { 
    font-size: 34px; font-weight: 800; margin: 0; letter-spacing: -1.5px; 
    background: linear-gradient(to right, var(--text), var(--p));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.app-header p { font-size: 14px; color: var(--text-dim); margin-top: 8px; font-weight: 500; }

.theme-toggle {
    position: absolute; right: 0; top: 5px;
    background: var(--card); border: 1px solid var(--border);
    color: var(--text); padding: 12px; border-radius: 14px;
    cursor: pointer; font-size: 18px; display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.app-container { width: 100%; max-width: 1300px; display: flex; flex-direction: column; gap: 24px; }
@media (min-width: 1024px) { .app-container { flex-direction: row; align-items: flex-start; } }

.card { 
    background: var(--card); backdrop-filter: blur(12px);
    padding: 30px; border-radius: 24px; border: 1px solid var(--border); 
    flex: 1; box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}
.sidebar { width: 100%; max-width: 380px; display: flex; flex-direction: column; gap: 24px; }

.drop-section { display: flex; gap: 20px; margin-bottom: 25px; }
#drop-zone { 
    flex: 1; border: 2px dashed var(--text-dim); padding: 40px; 
    border-radius: 20px; text-align: center; cursor: pointer; 
    background: var(--glass-bg); display: flex; flex-direction: column; gap: 10px;
    transition: 0.2s;
}
#drop-zone:hover { border-color: var(--p); background: rgba(99, 102, 241, 0.05); }
#image-preview { width: 120px; height: 120px; border-radius: 16px; object-fit: cover; border: 1px solid var(--border); display: none; }

.controls { 
    display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); 
    gap: 15px; margin-bottom: 25px; background: var(--glass-bg); padding: 20px; border-radius: 16px;
}
.field { display: flex; flex-direction: column; gap: 6px; }
label { font-size: 10px; font-weight: 800; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }
input, select { background: var(--bg); border: 1px solid var(--border); color: var(--text); padding: 10px; border-radius: 8px; font-size: 13px; outline: none; }

.grid-view { display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 12px; }
.swatch { 
    height: 110px; border-radius: 16px; position: relative; cursor: pointer;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    transition: 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.swatch:hover { transform: scale(1.05); box-shadow: 0 10px 20px rgba(0,0,0,0.2); }
.swatch-hex { font-family: 'JetBrains Mono'; font-size: 10px; padding: 4px 8px; border-radius: 6px; backdrop-filter: blur(4px); }

.history-container { max-height: 400px; overflow-y: auto; display: flex; flex-direction: column; gap: 12px; }
.history-item { 
    background: var(--glass-bg); border-radius: 14px; padding: 12px; 
    display: flex; align-items: center; gap: 15px; cursor: pointer; border: 1px solid transparent;
    transition: 0.2s;
}
.history-item:hover { border-color: var(--p); transform: translateX(5px); }
.history-thumb { width: 55px; height: 55px; border-radius: 8px; object-fit: cover; }
.history-palette { display: flex; height: 12px; flex: 1; border-radius: 6px; overflow: hidden; border: 1px solid var(--border); }

.btn-export { background: var(--p); color: white; border: none; padding: 16px; border-radius: 14px; font-weight: 800; cursor: pointer; width: 100%; transition: 0.2s; }
.btn-export:hover { background: var(--p-hover); transform: translateY(-2px); }

.sidebar-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
.btn-clear { background: transparent; border: 1px solid var(--fail); color: var(--fail); padding: 4px 8px; border-radius: 6px; font-size: 9px; font-weight: 700; cursor: pointer; text-transform: uppercase; }
.btn-clear:hover { background: var(--fail); color: white; }

.contrast-item { background: var(--glass-bg); padding: 14px; border-radius: 14px; margin-bottom: 8px; display: flex; justify-content: space-between; align-items: center; border-left: 4px solid var(--text-dim); }
.pass { border-left-color: var(--success); }
.fail { border-left-color: var(--fail); }

canvas, .hidden-picker { display: none; }