/* ============================================
   칼럼/케이스 페이지 전용 스타일
   - style.css의 CSS 변수 활용
   - 클래스 prefix: col- (충돌 방지)
   ============================================ */

/* ── 스크롤 진행 바 (상단 고정) ── */
.col-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), #7c3aed);
    z-index: 9999;
    transition: width 0.1s linear;
}

/* ── 페이지 컨테이너 ── */
.col-page {
    padding: 140px 24px 80px;
    max-width: 1200px;
    margin: 0 auto;
    color: var(--white);
}

/* ── Hero ── */
.col-hero {
    max-width: 800px;
    margin: 0 auto 40px;
    text-align: center;
}

.col-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary);
    color: #fff;
    border-radius: 30px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

.col-title {
    font-size: clamp(28px, 5vw, 44px);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--white), #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.col-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    color: var(--gray);
    font-size: 14px;
}

.col-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.col-hero-image {
    max-width: 1000px;
    margin: 40px auto;
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
}

.col-hero-image img {
    width: 100%;
    display: block;
}

/* Hero 이미지 없을 때 placeholder */
.col-hero-image.col-hero-empty {
    border: 2px dashed rgba(138, 153, 255, 0.35);
    border-radius: 24px;
    background:
        radial-gradient(circle at 30% 30%, rgba(138, 153, 255, 0.1) 0%, transparent 60%),
        linear-gradient(135deg, rgba(138, 153, 255, 0.06), rgba(124, 58, 237, 0.05));
}

.col-hero-image.col-hero-empty img {
    display: none;
}

.col-hero-image.col-hero-empty::before {
    content: '🖼️  대표 썸네일 예정';
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 16 / 9;
    color: var(--gray);
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 2px;
}

/* ── TL;DR 박스 (LLM 인용 대상) ── */
.col-tldr {
    max-width: 800px;
    margin: 0 auto 60px;
    padding: 28px 32px;
    background: linear-gradient(135deg, rgba(138, 153, 255, 0.12), rgba(124, 58, 237, 0.08));
    border-left: 4px solid var(--primary);
    border-radius: 0 16px 16px 0;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.col-tldr-label {
    display: inline-block;
    color: var(--primary);
    font-size: 14px;
    font-weight: 800;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.col-tldr p {
    font-size: 17px;
    line-height: 1.7;
    color: var(--white);
    margin: 0;
}

/* ── 본문 + 우측 sticky TOC ── */
.col-body-wrap {
    display: grid;
    grid-template-columns: minmax(0, 720px) 240px;
    gap: 60px;
    max-width: 1080px;
    margin: 0 auto;
    justify-content: center;
}

.col-toc {
    position: sticky;
    top: 100px;
    align-self: start;
    padding: 24px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.col-toc h3 {
    font-size: 12px;
    color: var(--primary);
    margin: 0 0 16px;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 700;
}

.col-toc ol {
    list-style: none;
    padding: 0;
    margin: 0;
    counter-reset: toc;
}

.col-toc li {
    counter-increment: toc;
    margin-bottom: 10px;
}

.col-toc a {
    display: block;
    padding: 8px 0 8px 14px;
    color: var(--gray);
    font-size: 14px;
    line-height: 1.5;
    border-left: 2px solid transparent;
    transition: 0.2s;
    text-decoration: none;
}

.col-toc a::before {
    content: counter(toc) ". ";
    color: var(--primary);
    font-weight: 700;
}

.col-toc a:hover,
.col-toc a.active {
    color: var(--white);
    border-left-color: var(--primary);
    background: rgba(138, 153, 255, 0.05);
}

/* ── 본문 ── */
.col-body {
    font-size: 17px;
    line-height: 1.9;
    color: #e2e8f0;
}

.col-body h2 {
    font-size: 28px;
    font-weight: 800;
    color: var(--white);
    margin: 56px 0 24px;
    padding-bottom: 12px;
    position: relative;
    scroll-margin-top: 80px;
}

.col-body h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), #7c3aed);
    border-radius: 2px;
}

.col-body h3 {
    font-size: 22px;
    font-weight: 700;
    margin: 32px 0 16px;
    color: var(--white);
}

.col-body p {
    margin: 0 0 24px;
}

.col-body strong {
    color: var(--white);
    font-weight: 700;
}

.col-body em {
    color: #cbd5e1;
}

.col-body a {
    color: var(--primary);
    border-bottom: 1px dashed var(--primary);
    text-decoration: none;
    transition: 0.2s;
}

.col-body a:hover {
    color: #7c3aed;
    border-bottom-style: solid;
}

.col-body blockquote {
    margin: 32px 0;
    padding: 20px 28px;
    background: rgba(138, 153, 255, 0.06);
    border-left: 4px solid var(--primary);
    border-radius: 0 12px 12px 0;
    color: var(--gray);
    font-style: italic;
}

.col-body blockquote p:last-child {
    margin-bottom: 0;
}

.col-body ul,
.col-body ol {
    margin: 24px 0 24px 8px;
    padding-left: 24px;
}

.col-body li {
    margin-bottom: 12px;
}

.col-body ul li::marker {
    color: var(--primary);
}

.col-body ol li::marker {
    color: var(--primary);
    font-weight: 700;
}

.col-body img {
    width: 100%;
    border-radius: 16px;
    margin: 32px 0;
    border: 1px solid var(--glass-border);
}

.col-body figure {
    margin: 32px 0;
}

.col-body figcaption {
    text-align: center;
    color: var(--gray);
    font-size: 14px;
    margin-top: 12px;
    font-style: italic;
}

/* ── 본문 썸네일 + 이미지 없을 때 점선 placeholder ── */
.col-thumb {
    margin: 36px 0;
}

.col-thumb img {
    width: 100%;
    display: block;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
}

.col-thumb.col-thumb-empty img {
    display: none;
}

.col-thumb.col-thumb-empty::before {
    content: '🖼️  이미지 예정';
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 16 / 9;
    background:
        radial-gradient(circle at 30% 30%, rgba(138, 153, 255, 0.08) 0%, transparent 60%),
        linear-gradient(135deg, rgba(138, 153, 255, 0.05), rgba(124, 58, 237, 0.04));
    border: 2px dashed rgba(138, 153, 255, 0.35);
    border-radius: 16px;
    color: var(--gray);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.col-body code {
    background: var(--dark-light);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.92em;
    color: var(--primary);
    font-family: 'Courier New', monospace;
}

.col-body pre {
    background: var(--dark-light);
    padding: 20px;
    border-radius: 12px;
    overflow-x: auto;
    margin: 24px 0;
    border: 1px solid var(--glass-border);
}

.col-body pre code {
    background: none;
    padding: 0;
    color: var(--white);
}

.col-body hr {
    border: none;
    height: 1px;
    background: var(--glass-border);
    margin: 48px 0;
}

/* ── 비교 표 (LLM이 인용하기 좋음) ── */
.col-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 32px 0;
    font-size: 15px;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
}

.col-body th,
.col-body td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.col-body th {
    background: rgba(138, 153, 255, 0.1);
    color: var(--primary);
    font-weight: 700;
}

.col-body tr:last-child td {
    border-bottom: none;
}

/* ── CTA 박스 (본문 중간/끝) ── */
.col-cta {
    margin: 60px 0;
    padding: 36px;
    background: linear-gradient(135deg, rgba(138, 153, 255, 0.15), rgba(124, 58, 237, 0.1));
    border: 1px solid rgba(138, 153, 255, 0.3);
    border-radius: 20px;
    text-align: center;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.col-cta h3 {
    font-size: 22px;
    font-weight: 800;
    margin: 0 0 12px;
    color: var(--white);
}

.col-cta p {
    color: var(--gray);
    margin: 0 0 24px;
}

.col-cta-btn {
    display: inline-block;
    padding: 14px 32px;
    background: var(--primary);
    color: #fff;
    border-radius: 50px;
    font-weight: 700;
    text-decoration: none;
    transition: 0.3s;
}

.col-cta-btn:hover {
    background: #7c3aed;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(138, 153, 255, 0.3);
}

/* ── 공유 ── */
.col-share {
    max-width: 720px;
    margin: 60px auto;
    padding: 32px 0;
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
    text-align: center;
}

.col-share-label {
    display: block;
    margin-bottom: 20px;
    font-size: 16px;
    color: var(--white);
    font-weight: 600;
}

.col-share-btns {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}

.col-share-btn {
    padding: 10px 20px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--white);
    cursor: pointer;
    font-size: 14px;
    transition: 0.2s;
    font-family: inherit;
}

.col-share-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ── 관련 글 ── */
.col-related {
    max-width: 1080px;
    margin: 60px auto 0;
}

.col-related h2 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 32px;
    text-align: center;
    color: var(--white);
}

.col-related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.col-related-card {
    display: block;
    padding: 24px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    transition: 0.3s;
    text-decoration: none;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.col-related-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 15px 35px rgba(138, 153, 255, 0.15);
}

.col-related-card .cat {
    display: inline-block;
    font-size: 12px;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.col-related-card .ttl {
    font-size: 17px;
    font-weight: 700;
    color: var(--white);
    line-height: 1.5;
    margin: 0 0 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.col-related-card .dt {
    font-size: 13px;
    color: var(--gray);
}

/* ── 반응형 ── */
@media (max-width: 900px) {
    .col-body-wrap {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .col-toc {
        display: none;
    }

    .col-page {
        padding: 100px 16px 60px;
    }

    .col-meta {
        gap: 12px;
        font-size: 13px;
    }

    .col-title {
        font-size: clamp(24px, 6vw, 32px);
    }

    .col-body {
        font-size: 16px;
        line-height: 1.85;
    }

    .col-body h2 {
        font-size: 24px;
        margin: 40px 0 18px;
    }

    .col-tldr {
        padding: 20px 24px;
    }

    .col-cta {
        padding: 28px 20px;
    }
}