/* ============================================
   專欄頁面 v2.1.0 — 深色主題美化
   ============================================ */
.columns-page {
    max-width: 1240px;
    margin: 0 auto;
    padding: 48px 24px 96px;
    color: #e8e8ec;
}

/* ── 頁面標題 ── */
.columns-page-header {
    text-align: center;
    margin-bottom: 56px;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.columns-page .page-title {
    font-size: 2.6rem;
    margin: 0 0 14px;
    font-weight: 800;
    background: linear-gradient(135deg, #6ec1ff 0%, #b794ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 1px;
}
.columns-page .page-title .title-icon {
    -webkit-text-fill-color: initial;
    margin-right: 8px;
}

.columns-page .page-desc {
    color: #a0a0ad;
    font-size: 1.08rem;
    margin: 0;
    letter-spacing: 0.3px;
}

/* ── Section 標題（重點美化）── */
.columns-section {
    margin-bottom: 64px;
}

.columns-section .section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
    padding: 14px 20px;
    background: linear-gradient(90deg,
        rgba(110,193,255,0.10) 0%,
        rgba(183,148,255,0.06) 60%,
        transparent 100%);
    border-left: 4px solid #6ec1ff;
    border-radius: 6px;
}

/* 不同區塊用不同主色 */
.feature-section .section-header {
    background: linear-gradient(90deg,
        rgba(255,180,120,0.12) 0%,
        rgba(255,120,180,0.06) 60%,
        transparent 100%);
    border-left-color: #ffb478;
}

.columns-section .section-title {
    font-size: 1.7rem;          /* ← 加大 */
    margin: 0;
    font-weight: 700;
    color: #ffffff;             /* ← 純白，最大對比 */
    letter-spacing: 1.2px;
    display: flex;
    align-items: center;
    gap: 10px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.section-icon {
    font-size: 1.5rem;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.4));
}

.columns-section .more-link {
    font-size: 0.95rem;
    color: #6ec1ff;
    text-decoration: none;
    padding: 6px 14px;
    border: 1px solid rgba(110,193,255,0.3);
    border-radius: 20px;
    transition: all .25s ease;
    white-space: nowrap;
    font-weight: 500;
}
.columns-section .more-link:hover {
    background: rgba(110,193,255,0.15);
    border-color: #6ec1ff;
    transform: translateX(2px);
}

/* ── Grid ── */
.columns-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

/* ── 卡片（深色玻璃擬態）── */
.column-card {
    display: flex;
    flex-direction: column;
    background: linear-gradient(145deg, #1f2128 0%, #1a1c22 100%);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 14px;
    overflow: hidden;
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    height: 100%;
    box-shadow: 0 4px 12px rgba(0,0,0,0.25);
}
.column-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 36px rgba(0,0,0,0.5),
                0 0 0 1px rgba(110,193,255,0.25);
    border-color: rgba(110,193,255,0.2);
}

/* ── 圖片區 ── */
.card-thumb-link {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #0e0f13;
    position: relative;
}
.card-thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .5s ease;
}
.column-card:hover .card-thumb-img {
    transform: scale(1.06);
}

.card-thumb-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(circle at 30% 40%, rgba(110,193,255,0.15), transparent 60%),
        radial-gradient(circle at 70% 60%, rgba(183,148,255,0.12), transparent 60%),
        linear-gradient(135deg, #23252d 0%, #1a1c22 100%);
}
.placeholder-icon {
    font-size: 3.4rem;
    opacity: 0.45;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.5));
}

/* ── 卡片內容 ── */
.card-info {
    padding: 16px 18px 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 9px;
}

.card-channels {
    font-size: 0.78rem;
}
.card-channels a {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(110,193,255,0.12);
    color: #8dcfff;
    border-radius: 12px;
    text-decoration: none;
    font-size: 0.76rem;
    margin-right: 4px;
    border: 1px solid rgba(110,193,255,0.18);
    transition: all .2s ease;
}
.card-channels a:hover {
    background: rgba(110,193,255,0.22);
    color: #c5e6ff;
}

.card-title {
    font-size: 1.08rem;
    line-height: 1.45;
    margin: 2px 0 0;
    font-weight: 600;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.card-title a {
    color: #f0f0f5;
    text-decoration: none;
    transition: color .2s ease;
}
.card-title a:hover { color: #6ec1ff; }

.card-meta {
    font-size: 0.8rem;
    color: #8a8a96;
    display: flex;
    gap: 12px;
}

.card-excerpt {
    font-size: 0.88rem;
    color: #b0b0ba;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-top: auto;
}

/* ── 空狀態 ── */
.empty-msg {
    text-align: center;
    color: #888;
    padding: 48px 20px;
    background: rgba(255,255,255,0.02);
    border: 1px dashed rgba(255,255,255,0.08);
    border-radius: 10px;
}

/* ── 手機版 ── */
@media (max-width: 768px) {
    .columns-page { padding: 32px 16px 64px; }
    .columns-page .page-title { font-size: 2rem; }
    .columns-section .section-title { font-size: 1.4rem; }
    .columns-section .section-header { padding: 12px 14px; }
}

@media (max-width: 600px) {
    .columns-grid { grid-template-columns: 1fr; gap: 18px; }
    .columns-page .page-title { font-size: 1.75rem; }
    .columns-page .page-desc { font-size: 0.95rem; }
    .columns-section .section-title { font-size: 1.25rem; }
    .columns-section .more-link { font-size: 0.85rem; padding: 4px 10px; }
}

/* ── 淺色模式自動適配（如果使用者切回淺色）── */
@media (prefers-color-scheme: light) {
    body:not(.dark-mode) .columns-page { color: #222; }
    body:not(.dark-mode) .column-card {
        background: #fff;
        border-color: #ececec;
    }
    body:not(.dark-mode) .card-title a { color: #222; }
    body:not(.dark-mode) .card-excerpt { color: #555; }
}