:root {
    --primary: #6366f1;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
    --border: #e2e8f0;
    --radius: 16px;
}

[data-theme="dark"] {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #f1f5f9;
    --border: #334155;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Inter', system-ui, sans-serif; }

body { background: var(--bg); color: var(--text); transition: background 0.3s; line-height: 1.6; }

.container { max-width: 1000px; margin: 0 auto; padding: 2rem; }

/* Hero & Header */
.hero { text-align: center; margin-bottom: 3rem; }
.gradient-text { background: linear-gradient(90deg, #6366f1, #a855f7); -webkit-background-clip: text; -webkit-text-fill-color: transparent; font-weight: 800; }

/* Drop Zone */
.upload-card {
    border: 2px dashed var(--primary);
    background: var(--card);
    border-radius: var(--radius);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
    box-shadow: 0 10px 25px -5px rgba(0,0,0,0.1);
}

.upload-card:hover { transform: translateY(-5px); background: rgba(99, 102, 241, 0.05); }

/* Preview Cards */
.preview-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; margin-top: 2rem; }

.img-card {
    background: var(--card);
    padding: 1rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Controls & Inputs */
.settings-grid { display: flex; gap: 2rem; background: var(--card); padding: 1.5rem; border-radius: var(--radius); margin-bottom: 2rem; align-items: center; }

.btn-primary { background: var(--primary); color: white; border: none; padding: 0.8rem 1.5rem; border-radius: 8px; font-weight: 600; cursor: pointer; }

/* Responsive adjustments */
@media (max-width: 768px) {
    .settings-grid { flex-direction: column; align-items: stretch; }
    .container { padding: 1rem; }
}