@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap');

:root {
    --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --background-color: #0d1117; /* Deep Navy Blue */
    --card-background-color: rgba(22, 27, 34, 0.6);
    --text-color: #c9d1d9;
    --text-color-secondary: #8b949e;
    
    /* K-Culture Accent Colors */
    --accent-color-kpop: #ff7eb9; /* Energetic Pink */
    --accent-color-kdrama: #4ed9d9; /* Vivid Teal */
    --accent-color-kfood: #ffdb58; /* Bright Yellow */
    --accent-color-kbeauty: #c792ea; /* Soft Lavender */

    --accent-color-default: var(--accent-color-kpop);

    --border-color: rgba(240, 246, 252, 0.1);
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
    --card-border-radius: 16px;
    --backdrop-blur: 10px;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 25px;
    background-image: url('data:image/svg+xml,%3Csvg width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"%3E%3Cfilter id="noise"%3E%3CfeTurbulence type="fractalNoise" baseFrequency="0.8" numOctaves="3" stitchTiles="stitch"/%3E%3C/filter%3E%3Crect width="100%25" height="100%25" filter="url(%23noise)" opacity="0.05"/%3E%3C/svg%3E');
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.8rem;
    font-weight: 700;
    margin: 0;
    background: linear-gradient(45deg, var(--accent-color-kpop), var(--accent-color-kdrama));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    font-size: 1.1rem;
    color: var(--text-color-secondary);
    margin-top: 8px;
}

#interest-selector {
    margin-bottom: 40px;
}

#interest-selector h2, #news-feed h2 {
    font-size: 1.3rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 25px;
    color: var(--text-color-secondary);
}

.interests-container {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.interest-btn {
    background-color: transparent;
    color: var(--text-color-secondary);
    border: 1px solid var(--border-color);
    padding: 10px 22px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.25s ease;
}

.interest-btn:hover {
    transform: translateY(-2px);
    color: #fff;
    border-color: var(--accent-color-default);
}

.interest-btn.active {
    color: #fff;
    transform: translateY(-2px);
    border-width: 2px;
}

.interest-btn[data-interest="K-Pop"].active {
    border-color: var(--accent-color-kpop);
    box-shadow: 0 0 15px rgba(255, 126, 185, 0.4);
}
.interest-btn[data-interest="K-Drama"].active {
    border-color: var(--accent-color-kdrama);
    box-shadow: 0 0 15px rgba(78, 217, 217, 0.4);
}
.interest-btn[data-interest="K-Food"].active {
    border-color: var(--accent-color-kfood);
    box-shadow: 0 0 15px rgba(255, 219, 88, 0.4);
}
.interest-btn[data-interest="K-Beauty"].active {
    border-color: var(--accent-color-kbeauty);
    box-shadow: 0 0 15px rgba(199, 146, 234, 0.4);
}

.feed-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
}

.news-article {
    background-color: var(--card-background-color);
    border-radius: var(--card-border-radius);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(var(--backdrop-blur));
    -webkit-backdrop-filter: blur(var(--backdrop-blur));
}

.news-article:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.4);
}

.article-image {
    width: 100%;
    height: 180px;
    background-size: cover;
    background-position: center;
    border-bottom: 1px solid var(--border-color);
}

.article-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.article-content h3 {
    margin: 0 0 10px 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.article-content p {
    margin: 0 0 15px 0;
    color: var(--text-color-secondary);
    flex-grow: 1;
    line-height: 1.5;
    font-size: 0.95rem;
}

.article-content a {
    color: var(--accent-color-kpop);
    text-decoration: none;
    font-weight: 600;
    align-self: flex-start;
    transition: color 0.2s ease;
}

.article-content a:hover {
    color: #fff;
}

.placeholder-message {
    grid-column: 1 / -1; 
    text-align: center;
    padding: 40px;
    font-size: 1rem;
    color: var(--text-color-secondary);
    background-color: var(--card-background-color);
    border-radius: var(--card-border-radius);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(var(--backdrop-blur));
    -webkit-backdrop-filter: blur(var(--backdrop-blur));
}

/* --- Responsive Design --- */

@media (min-width: 600px) {
    .feed-container {
        grid-template-columns: repeat(2, 1fr);
    }
    header h1 {
        font-size: 3.5rem;
    }
}

@media (min-width: 900px) {
    .feed-container {
        grid-template-columns: repeat(3, 1fr);
        gap: 30px;
    }
    body {
        padding: 40px;
    }
}