:root {
    --background-color: #f0f2f5;
    --card-background: #ffffff;
    --text-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --card-text: #1a1a1a;
    --border-color: #dee2e6;
    --primary-color: #006ce1; /* Reliable blue for finance */
    --positive-color: #d32f2f;
    --section-margin: 60px;
}

.dark-mode {
    --primary-color: #006ce1;
    --background-color: #121212;
    --card-background: rgba(255, 255, 255, 0.05);
    --text-color: #e0e0e0;
    --shadow-color: rgba(0, 108, 225, 0.1);
    --card-text: #ffffff;
    --border-color: rgba(255, 255, 255, 0.1);
    --positive-color: #ff5252;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    line-height: 1.6;
}

.main-header {
    background: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    padding: 30px 20px;
    text-align: center;
}

.header-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.container {
    max-width: 800px;
    margin: 40px auto;
    background: var(--card-background);
    padding: 50px 40px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.theme-toggle {
    position: absolute;
    top: -10px;
    right: 0;
    background: var(--background-color);
    border: 1px solid var(--border-color);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 6px var(--shadow-color);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.date-display {
    font-size: 0.95rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 700;
}

h1 {
    font-size: 2.2rem;
    font-weight: 700;
    margin: 0;
}

h2 {
    font-size: 1.6rem;
    margin-bottom: 25px;
    text-align: center;
}

.intro-section {
    text-align: center;
    margin-bottom: 40px;
}

.intro-text {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.stocks-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin: 40px 0;
}

.stock-card {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 5px 15px var(--shadow-color);
    transition: transform 0.3s ease;
}

.stock-card:hover {
    transform: translateY(-5px);
}

.stock-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--card-text);
    margin-bottom: 8px;
}

.stock-reason {
    font-size: 0.95rem;
    color: var(--text-color);
    opacity: 0.85;
}

.stock-return {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--positive-color);
    text-align: right;
}

.generate-btn {
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    padding: 18px 30px;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    margin-bottom: 40px;
}

.generate-btn:hover {
    background-color: #0056b3;
    box-shadow: 0 5px 15px rgba(0, 108, 225, 0.4);
}

.divider {
    margin: var(--section-margin) 0;
    border: 0;
    border-top: 1px solid var(--border-color);
}

.guide-section, .about-section, .contact-section {
    padding: 20px 0;
}

.guide-content p {
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 500px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: left;
}

.form-group input, .form-group textarea {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 15px;
    color: var(--card-text);
    font-family: inherit;
    font-size: 1rem;
}

.submit-btn {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 15px;
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    background-color: var(--primary-color);
    color: #ffffff;
}

.main-footer {
    background: var(--card-background);
    padding: 40px 20px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

.footer-links {
    margin-top: 15px;
    font-size: 0.9rem;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    margin: 0 10px;
}

.back-btn {
    position: absolute;
    left: 0;
    top: 0;
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.9rem;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--background-color);
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: var(--primary-color);
    color: #ffffff;
}

.policy-content {
    text-align: left;
}

.policy-content h3 {
    margin: 30px 0 15px;
    font-size: 1.3rem;
    color: var(--card-text);
}

.policy-content p, .policy-content li {
    font-size: 0.95rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.policy-content ul {
    padding-left: 20px;
}

.share-section {
    margin-top: 30px;
    text-align: center;
}

.share-title {
    font-size: 1rem;
    margin-bottom: 15px;
    opacity: 0.8;
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.share-btn {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px var(--shadow-color);
}

.share-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px var(--shadow-color);
}

.share-btn.kakao { background-color: #FEE500; color: #3c1e1e; }
.share-btn.x { background-color: #000000; color: #ffffff; }
.share-btn.facebook { background-color: #1877F2; color: #ffffff; }
.share-btn.link { background-color: #e0e0e0; color: #333333; }

@media (max-width: 600px) {
    .container {
        margin: 20px;
        padding: 30px 20px;
    }
...    
    .stock-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .stock-return {
        align-self: flex-end;
    }

    .theme-toggle {
        top: -20px;
    }
}