:root {
    /* Light Mode */
    --bg-color: #f8f9fa;
    --header-bg: #ffffff;
    --text-color: #212529;
    --text-secondary: #6c757d;
    --primary-color: #0d6efd;
    --accent-color: #f1f3f5;
    --card-bg: #ffffff;
    --shadow: 0 10px 30px rgba(0,0,0,0.05);
    --border-color: #dee2e6;
}

[data-theme="dark"] {
    /* Dark Mode */
    --bg-color: #121212;
    --header-bg: #1e1e1e;
    --text-color: #e9ecef;
    --text-secondary: #adb5bd;
    --primary-color: #3d8bfd;
    --accent-color: #2b2b2b;
    --card-bg: #1e1e1e;
    --shadow: 0 10px 40px rgba(0,0,0,0.3);
    --border-color: #343a40;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    transition: background-color 0.4s ease, color 0.4s ease;
}

header {
    background-color: var(--header-bg);
    padding: 1.2rem 10%;
    text-align: center;
    box-shadow: 0 2px 15px rgba(0,0,0,0.02);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--primary-color), #6610f2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

main {
    padding: 3rem 10%;
    max-width: 1000px;
    margin: 0 auto;
}

#daily-summary {
    margin-bottom: 3.5rem;
}

.summary-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 1.5rem;
}

.summary-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.summary-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: var(--primary-color);
}

.summary-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.summary-list li {
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
    font-weight: 500;
    padding-left: 2rem;
    position: relative;
    color: var(--text-color);
}

.summary-list li::before {
    content: "⚡";
    position: absolute;
    left: 0;
    font-size: 1rem;
}

.value-analysis {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.news-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.refresh-btn {
    background: var(--accent-color);
    color: var(--primary-color);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 700;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.refresh-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.2);
}

.rotating {
    animation: rotate 0.5s linear;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

/* Partnership Form Styles */
#contact {
    margin-top: 4rem;
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.95rem;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.submit-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    width: 100%;
    font-size: 1rem;
    transition: transform 0.2s, opacity 0.2s;
}

.submit-btn:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

#theme-toggle {
    background: var(--accent-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s ease;
}

#theme-toggle:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    header, main { padding: 1rem 5%; }
    .summary-card, #contact { padding: 1.5rem; }
    .news-section-header { flex-direction: column; align-items: flex-start; gap: 1rem; }
}