:root {
    --primary-color: #3182f6;
    --bg-color: #f2f4f6;
    --container-bg: white;
    --text-color: #333d4b;
    --subtext-color: #6b7684;
    --border-color: #e5e8eb;
    --card-bg: #f9fafb;
    --header-height: 60px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #4892ff;
        --bg-color: #121212;
        --container-bg: #1e1e1e;
        --text-color: #e0e0e0;
        --subtext-color: #a0a0a0;
        --border-color: #333;
        --card-bg: #2a2a2a;
    }
}

body {
    font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

/* ============================
   LAYOUT
   ============================ */

header {
    width: 100%;
    height: var(--header-height);
    background-color: var(--container-bg);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: flex;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s, border-color 0.3s;
}

.header-container {
    width: 100%;
    max-width: 960px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo a { /* ... */ }
header nav a { /* ... */ }

main {
    width: 100%;
    padding: 20px;
    padding-top: calc(var(--header-height) + 20px);
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-grow: 1;
}

.page-section {
    display: none;
    width: 100%;
}

.page-section.active {
    display: block;
}

footer {
    width: 100%;
    text-align: center;
    padding: 30px 0;
    margin-top: 20px;
    color: var(--subtext-color);
    font-size: 13px;
    border-top: 1px solid var(--border-color);
    transition: color 0.3s, border-color 0.3s;
}

/* ============================
   COMPONENTS
   ============================ */

.container {
    background: var(--container-bg);
    width: 100%;
    max-width: 500px;
    padding: 30px;
    border-radius: 24px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    box-sizing: border-box;
    margin: 0 auto 20px auto;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s, border-color 0.3s;
}

h1 { font-size: 26px; /* ... */ }
h2 { font-size: 22px; /* ... */ }
.subtitle { color: var(--subtext-color); /* ... */ }

mark {
    background-color: rgba(49, 130, 246, 0.2); /* Semi-transparent primary color */
    color: inherit;
    border-radius: 3px;
    padding: 0 2px;
}

/* --- Homepage Dashboard --- */
.quick-link-grid { /* ... */ }
.quick-link-card { /* ... */ }
.details-toggle { /* ... */ }
#advanced-filters { /* ... */ }
.section-title { /* ... */ }

/* --- Input & Forms --- */
.search-bar-wrapper { /* ... */ }
#search-query {
    padding: 20px 25px;
    padding-right: 60px;
    font-size: 18px;
    border: 2px solid var(--primary-color);
    border-radius: 16px;
    background-color: var(--bg-color);
}
.search-icon {
    right: 20px;
    width: 28px; height: 28px;
    opacity: 0.7;
}

.form-group { /* ... */ }
label { /* ... */ }
select, input, textarea {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 16px;
}

/* --- Cards --- */
.result-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    /* ... */
}
.result-card:hover {
    border-color: var(--primary-color);
}

.tag { /* ... */ }
.bookmark-icon { /* ... */ }
.share-icon {
    position: absolute;
    top: 15px;
    right: 55px;
    font-size: 24px;
    cursor: pointer;
    z-index: 10;
    opacity: 0.6;
    transition: transform 0.2s;
}
.share-icon:hover {
    transform: scale(1.2);
    opacity: 1;
}

/* --- Other --- */
.ad-banner { background-color: var(--card-bg); }
.category-grid { /* ... */ }
.category-card { background: var(--card-bg); }
.article-body { /* ... */ }

/* ============================
   MOBILE OPTIMIZATION
   ============================ */
@media (max-width: 600px) {
    header nav a {
        margin-left: 15px;
        font-size: 15px;
    }
    .logo a { font-size: 18px; }
    .quick-link-grid { grid-template-columns: repeat(2, 1fr); }
}