/**
 * Nebula Theme - Responsive & Grid System
 * Version: 2.0.5
 * 统一响应式系统：栅格、弹性容器、断点管理
 * 设计断点: xs(480) sm(576) md(768) lg(1024) xl(1280) 2xl(1536)
 */

/* ============================
   1. 容器系统
   ============================ */
.nebula-container,
.container {
    width: 100%;
    max-width: min(var(--nebula-container-max, 1200px), 100% - 32px);
    margin: 0 auto;
    padding: 0 var(--nebula-page-padding, 16px);
}

@media (min-width: 768px) {
    .nebula-container,
    .container {
        padding: 0 24px;
    }
}

@media (min-width: 1024px) {
    .nebula-container,
    .container {
        padding: 0 32px;
    }
}

/* 文章窄容器 */
.nebula-container--narrow {
    max-width: var(--nebula-container-article, 800px);
}

/* ============================
   2. 弹性栅格系统
   ============================ */
.nebula-grid {
    display: grid;
    gap: var(--nebula-space-5, 20px);
}

/* 列数控制 */
.nebula-grid--1 { grid-template-columns: 1fr; }
.nebula-grid--2 { grid-template-columns: repeat(2, 1fr); }
.nebula-grid--3 { grid-template-columns: repeat(3, 1fr); }
.nebula-grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
    .nebula-grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nebula-grid--2,
    .nebula-grid--3,
    .nebula-grid--4 { grid-template-columns: 1fr; }
}

/* ============================
   3. 弹性布局系统
   ============================ */
.nebula-flex {
    display: flex;
    gap: var(--nebula-space-5, 20px);
}

.nebula-flex--row {
    flex-direction: row;
}

.nebula-flex--col {
    flex-direction: column;
}

.nebula-flex--wrap {
    flex-wrap: wrap;
}

.nebula-flex--center {
    align-items: center;
    justify-content: center;
}

.nebula-flex__main {
    flex: 1;
    min-width: 0;
}

.nebula-flex__sidebar {
    width: 320px;
    flex-shrink: 0;
}

@media (max-width: 1024px) {
    .nebula-flex {
        flex-direction: column;
    }
    .nebula-flex__sidebar {
        width: 100%;
    }
}

/* ============================
   4. 响应式间距系统
   ============================ */
@media (max-width: 768px) {
    :root {
        --nebula-page-padding: 12px;
    }

    .nebula-section {
        padding: 32px 0;
    }

    .nebula-section--lg {
        padding: 48px 0;
    }
}

/* ============================
   5. 响应式字体
   ============================ */
@media (max-width: 768px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1.1rem; }

    body {
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 1.5rem; }

    body {
        font-size: 0.9rem;
    }
}

/* ============================
   6. 分页（移动端优化）
   ============================ */
@media (max-width: 768px) {
    .nebula-pagination .page-numbers {
        padding: 6px 10px;
        margin: 0 2px;
        font-size: 0.85rem;
    }

    .nebula-pagination .page-numbers.prev,
    .nebula-pagination .page-numbers.next {
        padding: 6px 8px;
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .nebula-pagination {
        padding: 20px 0;
    }

    .nebula-pagination .page-numbers {
        padding: 5px 8px;
        margin: 0 1px;
        font-size: 0.8rem;
        min-width: 30px;
    }

    /* 隐藏中间页码，只显示首尾 + 当前 */
    .nebula-pagination .page-numbers:not(.prev):not(.next):not(.current):not(:first-of-type):not(:last-of-type) {
        display: none;
    }
}

/* ============================
   7. 卡片列表 - 响应式
   ============================ */
.nebula-post-list--grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--nebula-space-5, 20px);
}

.nebula-post-list--list {
    display: flex;
    flex-direction: column;
    gap: var(--nebula-space-5, 20px);
}

@media (max-width: 768px) {
    .nebula-post-list--grid {
        grid-template-columns: 1fr;
        gap: var(--nebula-space-4, 16px);
    }
}

/* ============================
   8. 特色区域 - 响应式
   ============================ */
.ds-featured-area__inner {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--nebula-space-6, 24px);
    align-items: stretch;
}

@media (max-width: 1024px) {
    .ds-featured-area__inner {
        grid-template-columns: 1fr;
    }
}

/* ============================
   9. 页脚 - 响应式
   ============================ */
.nebula-footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--nebula-space-10, 40px);
    padding: var(--nebula-space-12, 48px) 0 var(--nebula-space-8, 32px);
}

@media (max-width: 1024px) {
    .nebula-footer__grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--nebula-space-8, 32px);
    }
    .nebula-footer__brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .nebula-footer__grid {
        grid-template-columns: 1fr;
        gap: var(--nebula-space-6, 24px);
        padding: var(--nebula-space-8, 32px) 0 var(--nebula-space-6, 24px);
    }
    .nebula-footer__bottom {
        flex-direction: column;
        gap: var(--nebula-space-3, 12px);
        text-align: center;
    }
}

/* ============================
   10. 搜索页 - 响应式
   ============================ */
.nebula-search-layout {
    display: flex;
    gap: var(--nebula-space-8, 32px);
    align-items: flex-start;
}

.nebula-search-sidebar {
    width: 320px;
    flex-shrink: 0;
    position: sticky;
    top: 84px;
}

@media (max-width: 1024px) {
    .nebula-search-layout {
        flex-direction: column;
    }
    .nebula-search-sidebar {
        width: 100%;
        position: static;
    }
}

@media (max-width: 768px) {
    .nebula-search-hero {
        padding: 40px 0 24px;
    }
    .nebula-search-hero__title {
        font-size: 1.5rem;
    }
    .nebula-search-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .nebula-search-filters {
        width: 100%;
    }
    .nebula-search-filter__select {
        width: 100%;
    }
}

/* ============================
   11. 触摸反馈 / 交互
   ============================ */
@media (hover: hover) and (pointer: fine) {
    /* PC 端 hover 效果 */
    .nebula-post-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--nebula-shadow-card-hover, 0 8px 30px rgba(0, 0, 0, 0.12));
    }
}

@media (hover: none) and (pointer: coarse) {
    /* 移动端触摸优化 */
    .nebula-post-card:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }

    /* 增大触摸目标 */
    .nebula-nav-menu a,
    .nebula-header__user-btn,
    .nebula-header__theme-toggle {
        min-height: 44px;
        min-width: 44px;
    }

    /* 移动端链接下划线提示 */
    .nebula-post-card__title a {
        text-decoration: underline;
        text-decoration-color: transparent;
        -webkit-text-decoration-color: transparent;
        transition: text-decoration-color 0.2s;
    }

    .nebula-post-card__title a:active {
        text-decoration-color: var(--nebula-primary, #0EA5E9);
    }

    /* 禁用 hover 效果 */
    .nebula-card:hover {
        transform: none !important;
    }

    .nebula-btn:hover {
        transform: none !important;
    }
}

/* ============================
   12. 减少动效偏好
   ============================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================
   13. 相关文章 - 响应式
   ============================ */
.nebula-related-posts__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--nebula-space-5, 20px);
}

@media (max-width: 1024px) {
    .nebula-related-posts__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .nebula-related-posts__grid {
        grid-template-columns: 1fr;
    }
}

/* ============================
   14. 文章布局 - 响应式
   ============================ */
.nebula-article-layout {
    display: flex;
    gap: var(--nebula-space-8, 32px);
    align-items: flex-start;
}

.nebula-article-main {
    flex: 1;
    min-width: 0;
    max-width: 800px;
}

.nebula-article-sidebar {
    width: 320px;
    flex-shrink: 0;
    position: sticky;
    top: 84px;
}

@media (max-width: 1200px) {
    .nebula-toc-sidebar {
        display: none;
    }
}

@media (max-width: 1024px) {
    .nebula-article-layout {
        flex-direction: column;
    }
    .nebula-article-sidebar {
        width: 100%;
        position: static;
    }
}

/* ============================
   15. 轮播图 - 响应式高度
   ============================ */
.ds-featured-carousel__slide {
    aspect-ratio: 16 / 10;
}

@media (max-width: 768px) {
    .ds-featured-carousel__slide {
        aspect-ratio: 16 / 9;
    }
    .ds-featured-carousel__arrow {
        width: 32px;
        height: 32px;
    }
}

/* ============================
   16. 侧边栏 - 移动端隐藏
   ============================ */
@media (max-width: 768px) {
    .nebula-sidebar--hidden-mobile {
        display: none;
    }
}

@media (max-width: 480px) {
    .nebula-sidebar--hidden-phone {
        display: none;
    }
}

/* ============================
   17. 间距系统 - 移动端压缩
   ============================ */
@media (max-width: 768px) {
    .nebula-article-header {
        padding: 32px 0 24px;
    }
    .nebula-article-content-wrapper {
        padding: 24px 0;
    }
    .nebula-page-content-wrapper {
        padding: 24px 0;
    }
    .nebula-related-posts {
        padding: 32px 0;
    }
}