:root {
    --primary-color: #1877F2; /* Facebook Blue */
    --secondary-color: #000000; /* X Black */
    --bg-color: #f4f6f8;
    --card-bg: #ffffff;
    --text-color: #333333;
    --header-bg: #1e3a8a; /* Deep Blue for dignity */
    --header-text: #ffffff;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --radius: 12px;
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.main-header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 2rem 1rem;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.header-content h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.header-content p {
    font-size: 1rem;
    opacity: 0.9;
}

/* Main Container */
.sns-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 2rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

@media (min-width: 768px) {
    .sns-container {
        flex-direction: row;
        align-items: flex-start;
    }
}

/* Feed Sections */
.sns-feed {
    flex: 1;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 500px;
}

.feed-header {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #eee;
}

.facebook-feed .feed-header {
    background-color: #f0f2f5;
    color: var(--primary-color);
}

.x-feed .feed-header {
    background-color: #f5f8fa;
    color: var(--secondary-color);
}

.feed-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
}

.feed-header .icon {
    font-size: 1.5rem;
}

.feed-content {
    padding: 1rem;
    display: flex;
    justify-content: center;
    background-color: #fff;
    flex-grow: 1;
}

/* Embed Specific Adjustments */
.fb-page, .fb-page span, .fb-page iframe {
    width: 100% !important;
    max-width: 500px;
}

.twitter-timeline {
    width: 100% !important;
}

/* Footer */
.main-footer {
    text-align: center;
    padding: 1.5rem;
    background-color: #fff;
    color: #666;
    font-size: 0.9rem;
    border-top: 1px solid #eaeaea;
}