:root {
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-color: #212529;
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4cc9f0;
    --container-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* 네비게이션 */
.navbar {
    position: sticky;
    top: 0;
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    z-index: 1000;
}
.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo { font-size: 1.5rem; font-weight: 700; color: var(--primary-color); text-decoration: none; }
.nav-links { display: flex; gap: 1.5rem; align-items: center; }
.nav-links a { text-decoration: none; color: var(--text-color); font-weight: 500; font-size: 0.9rem; }
.theme-toggle-btn {
    background: none; border: 1px solid var(--text-color); padding: 5px 12px; border-radius: 15px; cursor: pointer; color: var(--text-color);
}

/* 컨테이너 */
.container {
    max-width: 800px;
    margin: 3rem auto;
    padding: 0 1.5rem;
}

/* 히어로 섹션 (테스트 영역) */
.hero-section {
    background-color: var(--card-bg);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: var(--container-shadow);
    text-align: center;
    margin-bottom: 3rem;
}
h1 { font-size: 2.25rem; margin-bottom: 0.75rem; font-weight: 800; letter-spacing: -1px; }
.subtitle { opacity: 0.7; font-size: 1.1rem; margin-bottom: 2rem; }

/* 업로드 영역 */
#image-upload-container {
    border: 2px dashed var(--primary-color);
    border-radius: 20px;
    padding: 3rem;
    cursor: pointer;
    transition: all 0.2s;
}
#image-upload-container:hover { background-color: rgba(67, 97, 238, 0.03); }
.upload-icon { font-size: 3rem; display: block; margin-bottom: 1rem; }
.upload-text { font-size: 1.2rem; font-weight: 600; display: block; margin-bottom: 0.5rem; }
.upload-hint { font-size: 0.8rem; opacity: 0.6; }
#image-preview { max-width: 100%; border-radius: 15px; margin-top: 1.5rem; }

/* 정보 섹션 */
.info-section { text-align: left; padding: 2rem 0; }
.info-section h2 { font-size: 1.75rem; margin-bottom: 1.5rem; }
.info-section h3 { margin-top: 2rem; margin-bottom: 1rem; }
.info-section p { margin-bottom: 1.2rem; opacity: 0.85; }

.guide-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-top: 2rem; }
.guide-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 16px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
}
.guide-card h4 { margin-bottom: 0.75rem; font-size: 1.1rem; }
.guide-card p { font-size: 0.9rem; line-height: 1.5; margin-bottom: 0; }

/* 결과 리포트 */
.result-detail {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: rgba(67, 97, 238, 0.05);
    border-radius: 12px;
    text-align: left;
    font-size: 0.95rem;
}

/* 푸터 */
.footer {
    background-color: var(--card-bg);
    padding: 4rem 2rem;
    margin-top: 5rem;
    border-top: 1px solid rgba(0,0,0,0.05);
}
.footer-container { max-width: 1000px; margin: 0 auto; text-align: center; }
.footer-links { display: flex; justify-content: center; gap: 2rem; margin: 1.5rem 0; }
.footer-links a { text-decoration: none; color: var(--text-color); font-size: 0.85rem; opacity: 0.7; }
.privacy-note { font-size: 0.75rem; opacity: 0.5; max-width: 600px; margin: 0 auto; }

.divider { height: 1px; background-color: var(--text-color); opacity: 0.1; margin: 4rem 0; }

/* 기존 스타일 호환 */
#label-container { margin: 1.5rem 0; }
.prediction-bar-wrapper { display: flex; align-items: center; margin-bottom: 12px; gap: 12px; }
.bar-container { flex-grow: 1; height: 12px; background-color: rgba(0,0,0,0.05); border-radius: 6px; overflow: hidden; }
.bar { height: 100%; background: linear-gradient(90deg, var(--primary-color), var(--accent-color)); width: 0%; transition: width 0.3s; }

@media (max-width: 600px) {
    .guide-grid { grid-template-columns: 1fr; }
    h1 { font-size: 1.75rem; }
}