:root {
    --primary-color: #00d2ff;
    --secondary-color: #3a7bd5;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --accent-color: #fbbf24;
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 500px;
    padding: 20px;
    text-align: center;
}

header {
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: #94a3b8;
}

.card {
    background-color: var(--card-bg);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
    min-height: 350px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hidden {
    display: none !important;
}

/* Upload Area */
.upload-area {
    border: 2px dashed #475569;
    border-radius: 15px;
    width: 100%;
    padding: 40px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover, .upload-area.active {
    border-color: var(--primary-color);
    background-color: rgba(0, 210, 255, 0.05);
}

.upload-area i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.upload-area p {
    font-weight: 600;
    margin-bottom: 5px;
}

.upload-area span {
    font-size: 0.8rem;
    color: #64748b;
}

/* Analysis Animation */
.image-preview-container {
    position: relative;
    width: 250px;
    height: 250px;
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 20px;
    border: 3px solid var(--primary-color);
}

#preview-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.scan-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    box-shadow: 0 0 15px var(--primary-color);
    animation: scan 2s linear infinite;
}

@keyframes scan {
    0% { top: 0; }
    50% { top: 100%; }
    100% { top: 0; }
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: #334155;
    border-radius: 4px;
    margin-top: 15px;
    overflow: hidden;
}

.progress-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    transition: width 0.3s ease;
}

/* Results */
.score-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 8px solid var(--primary-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 25px;
    background: radial-gradient(circle, rgba(0, 210, 255, 0.1) 0%, transparent 70%);
}

#score-num {
    font-size: 4rem;
    font-weight: 800;
    color: var(--text-color);
}

.score-label {
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: 600;
}

#result-title {
    font-size: 1.8rem;
    margin-bottom: 10px;
    color: var(--accent-color);
}

#result-comment {
    color: #cbd5e1;
    margin-bottom: 30px;
    line-height: 1.6;
}

.btn {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 210, 255, 0.4);
}

footer {
    margin-top: 30px;
    font-size: 0.85rem;
    color: #64748b;
}