/* category-index.htm 系列栏目导航聚合页 — 复用 tech-page.css .tech-grid 卡片网格 */
/* 五档：Phone≤767 | Small 768–1024 | Mid 1025–1439 | Large 1440–1679 | XLarge≥1680 */

.ci-page {
    background-color: #ffffff;
}

.ci-hero {
    padding: 60px 0 40px;
    text-align: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-bottom: 1px solid #dee2e6;
}
/* 固定顶栏挡住标题：与 subscribeToNews / configurationTool 共用 .ci-hero */
@media screen and (min-width: 931px) {
    body.ci-page:has(.header-v1.theme-header) .ci-hero {
        margin-top: var(--theme-header-height, 75px);
    }
}

.ci-hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.ci-hero h1 {
    font-size: 32px;
    font-weight: 600;
    color: #1a1a2e;
    margin: 0 0 12px;
}

.ci-hero p {
    font-size: 16px;
    color: #6c757d;
    margin: 0;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.ci-section {
    padding: 48px 0 64px;
}

.ci-section-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.ci-section .tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.ci-section .tech-grid-item {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 72px;
    padding: 16px 20px;
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.25s ease;
    cursor: pointer;
}

.ci-section .tech-grid-item:hover {
    background-color: #003554;
    border-color: #003554;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,53,84,0.15);
}

.ci-section .tech-grid-item-text {
    font-size: 15px;
    font-weight: 500;
    color: #333333;
    transition: color 0.25s ease;
    text-align: center;
    line-height: 1.4;
}

.ci-section .tech-grid-item:hover .tech-grid-item-text {
    color: #ffffff;
}

.ci-empty {
    text-align: center;
    padding: 80px 20px;
    color: #888888;
}

.ci-empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.4;
}

.ci-empty h2 {
    font-size: 20px;
    font-weight: 500;
    color: #555555;
    margin: 0 0 8px;
}

.ci-empty p {
    font-size: 15px;
    color: #999999;
    margin: 0;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

@media screen and (max-width: 1679px) {
    .ci-hero h1 {
        font-size: max(var(--kyd-text-sm-min, 14px), calc(32px * var(--kyd-text-scale, 1)));
    }
    .ci-hero p {
        font-size: max(var(--kyd-text-sm-min, 14px), calc(16px * var(--kyd-text-scale, 1)));
    }
    .ci-section .tech-grid-item-text,
    .ci-empty p {
        font-size: max(var(--kyd-text-sm-min, 14px), calc(15px * var(--kyd-text-scale, 1)));
    }
    .ci-empty h2 {
        font-size: max(var(--kyd-text-sm-min, 14px), calc(20px * var(--kyd-text-scale, 1)));
    }
    .ci-empty-icon {
        font-size: max(var(--kyd-text-sm-min, 14px), calc(48px * var(--kyd-text-scale, 1)));
    }
}

@media screen and (min-width: 1440px) and (max-width: 1679px) {
    .ci-hero {
        padding: 52px 0 36px;
    }
    .ci-section {
        padding: 44px 0 56px;
    }
}

@media screen and (min-width: 1025px) and (max-width: 1439px) {
    .ci-hero {
        padding: 48px 0 32px;
    }
    .ci-section {
        padding: 40px 0 52px;
    }
    .ci-section .tech-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 14px;
    }
}

@media screen and (min-width: 768px) and (max-width: 1024px) {
    .ci-hero {
        padding: 40px 0 28px;
    }
    .ci-hero-inner,
    .ci-section-inner {
        padding: 0 24px;
    }
    .ci-section {
        padding: 32px 0 48px;
    }
    .ci-section .tech-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: 12px;
    }
    .ci-empty {
        padding: 64px 20px;
    }
}

@media screen and (max-width: 767px) {
    .ci-hero {
        padding: 36px 0 24px;
    }
    .ci-hero-inner,
    .ci-section-inner {
        padding: 0 16px;
    }
    .ci-section {
        padding: 28px 0 40px;
    }
    .ci-section .tech-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .ci-section .tech-grid-item {
        min-height: 60px;
        padding: 12px 16px;
    }
    .ci-empty {
        padding: 48px 16px;
    }
}