:root {
    --bg-color: #fdfbf7;
    --container-bg: #ffffff;
    --text-color: #2c2c2c;
    --secondary-text: #5d5d5d;
    --accent-color: #8b0000; /* Deep Red/Traditional */
    --gold-color: #b8860b;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    --button-bg: #2c2c2c;
    --button-hover: #4a4a4a;
    --button-text: #ffffff;
    --input-border: #e0e0e0;
    --input-focus: #8b0000;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --secondary-text: #b0b0b0;
    --accent-color: #ff4d4d;
    --gold-color: #ffd700;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --button-bg: #e0e0e0;
    --button-hover: #ffffff;
    --button-text: #121212;
    --input-border: #333333;
}

body {
    font-family: 'Noto Sans KR', 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.8;
    transition: all 0.3s ease;
}

header {
    background-color: var(--container-bg);
    border-bottom: 1px solid var(--input-border);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent-color);
    text-decoration: none;
    letter-spacing: -1px;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

.hero {
    text-align: center;
    margin-bottom: 5rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.hero p {
    font-size: 1.1rem;
    color: var(--secondary-text);
    max-width: 600px;
    margin: 0 auto;
}

.card {
    background-color: var(--container-bg);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    margin-bottom: 4rem;
    border: 1px solid rgba(0,0,0,0.02);
}

.section-title {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    border-left: 5px solid var(--accent-color);
    padding-left: 1rem;
}

.article-content {
    font-size: 1.05rem;
    color: var(--secondary-text);
    margin-bottom: 2.5rem;
}

.article-content h3 {
    color: var(--text-color);
    margin-top: 2rem;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--input-border);
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 12px;
    font-size: 1.2rem;
}

.upload-box {
    border: 2px dashed var(--input-border);
    padding: 3rem;
    border-radius: 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-box:hover {
    border-color: var(--accent-color);
    background-color: rgba(139, 0, 0, 0.02);
}

.btn {
    display: inline-block;
    background-color: var(--button-bg);
    color: var(--button-text);
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.3s;
}

.btn:hover {
    transform: translateY(-3px);
    opacity: 0.9;
}

.prediction-bar {
    margin-top: 1.5rem;
}

.progress-bg {
    background-color: var(--input-border);
    height: 10px;
    border-radius: 5px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.progress-fill {
    height: 100%;
    background-color: var(--accent-color);
    width: 0%;
    transition: width 1s ease-out;
}

footer {
    background-color: var(--container-bg);
    padding: 4rem 0;
    border-top: 1px solid var(--input-border);
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-col h4 {
    margin-bottom: 1.5rem;
}

.footer-col a {
    display: block;
    color: var(--secondary-text);
    text-decoration: none;
    margin-bottom: 0.8rem;
}

.footer-col a:hover {
    color: var(--accent-color);
}

.copyright {
    text-align: center;
    margin-top: 3rem;
    color: var(--secondary-text);
    font-size: 0.9rem;
}

/* Saju Form Styles */
.saju-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 600px) {
    .saju-grid {
        grid-template-columns: 1fr;
    }
}