:root {
    --primary: #6c63ff;
    --primary-dark: #5a52d5;
    --bg-dark: #0f0f1a;
    --bg-card: #1a1a2e;
    --bg-card2: #16213e;
    --text-main: #e0e0f0;
    --text-muted: #8888aa;
    --border: #2a2a4a;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
}

* { box-sizing: border-box; }

body {
    background: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Pretendard', 'Noto Sans KR', -apple-system, sans-serif;
    margin: 0;
    min-height: 100vh;
}

/* Navbar */
.navbar {
    background: rgba(26,26,46,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}
.navbar-brand {
    font-size: 1.4rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6c63ff, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}
.nav-link { color: var(--text-muted) !important; transition: color .2s; }
.nav-link:hover { color: var(--text-main) !important; }

/* Cards */
.card-3d {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    transition: transform .2s, box-shadow .2s;
}
.card-3d:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(108,99,255,.15); }

/* Buttons */
.btn-primary-3d {
    background: linear-gradient(135deg, #6c63ff, #a78bfa);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-weight: 600;
    padding: 0.6rem 1.4rem;
    transition: opacity .2s, transform .1s;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
.btn-primary-3d:hover { opacity: .9; transform: translateY(-1px); color: #fff; }
.btn-primary-3d:disabled { opacity: .5; cursor: not-allowed; }

.btn-outline-3d {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-muted);
    padding: 0.6rem 1.4rem;
    transition: border-color .2s, color .2s;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
.btn-outline-3d:hover { border-color: var(--primary); color: var(--primary); }

/* Form */
.form-3d {
    background: var(--bg-card2);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-main);
    padding: 0.6rem 0.9rem;
    width: 100%;
    outline: none;
    transition: border-color .2s;
}
.form-3d:focus { border-color: var(--primary); }
.form-label-3d { color: var(--text-muted); font-size: .875rem; margin-bottom: .35rem; display: block; }

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color .2s, background .2s;
}
.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(108,99,255,.06);
}
.upload-zone .icon { font-size: 3rem; margin-bottom: 1rem; opacity: .6; }

/* 3D Viewer */
#model-viewer-container {
    background: radial-gradient(ellipse at center, #1a1a3a 0%, #0f0f1a 70%);
    border-radius: 16px;
    overflow: hidden;
    min-height: 400px;
    position: relative;
    border: 1px solid var(--border);
}
model-viewer {
    width: 100%;
    height: 460px;
    --progress-bar-color: var(--primary);
}

/* Status */
.status-card { border-left: 3px solid var(--border); }
.status-card.completed { border-left-color: var(--success); }
.status-card.failed    { border-left-color: var(--danger); }
.status-card.processing { border-left-color: var(--warning); animation: pulse 1.5s infinite; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: .7; }
}

/* Generation History */
.history-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    gap: 1rem;
    align-items: center;
    transition: border-color .2s;
}
.history-item:hover { border-color: var(--primary); }
.history-thumb {
    width: 60px; height: 60px;
    border-radius: 8px;
    object-fit: cover;
    background: var(--bg-card2);
    flex-shrink: 0;
}

/* Progress bar */
.progress-3d {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}
.progress-3d-bar {
    height: 100%;
    background: linear-gradient(90deg, #6c63ff, #a78bfa);
    border-radius: 3px;
    transition: width .3s;
}

/* Hero */
.hero {
    padding: 5rem 0 3rem;
    text-align: center;
}
.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, #a78bfa 50%, #6c63ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
    margin-bottom: 1rem;
}
.hero p { color: var(--text-muted); font-size: 1.1rem; max-width: 600px; margin: 0 auto 2rem; }

/* Alert */
.alert-3d {
    border-radius: 10px;
    padding: .75rem 1rem;
    margin-bottom: 1rem;
    font-size: .9rem;
}
.alert-danger  { background: rgba(239,68,68,.1);  border: 1px solid rgba(239,68,68,.3);  color: #fca5a5; }
.alert-success { background: rgba(34,197,94,.1);  border: 1px solid rgba(34,197,94,.3);  color: #86efac; }
.alert-info    { background: rgba(108,99,255,.1); border: 1px solid rgba(108,99,255,.3); color: #c4b5fd; }

/* Credits badge */
.credits-badge {
    background: rgba(108,99,255,.15);
    border: 1px solid rgba(108,99,255,.3);
    border-radius: 20px;
    padding: .2rem .8rem;
    font-size: .8rem;
    color: #a78bfa;
}

/* Slider */
input[type=range] {
    accent-color: var(--primary);
    width: 100%;
}

/* Responsive */
@media (max-width: 768px) {
    .hero { padding: 3rem 0 2rem; }
    model-viewer { height: 320px; }
}