/* ============================================================
   首页专属样式 — home.css
   依赖: variables.css | reset.css | layout.css | components.css
   ============================================================ */

/* ===== 辅助 ===== */
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================================
   Hero 区块
============================================================ */
.hero-section {
    position: relative;
    overflow: hidden;
    padding: 72px 0 60px;
    text-align: center;
    /* 深蓝渐变背景 */
    background:
        linear-gradient(160deg,
            hsl(220, 68%, 10%) 0%,
            hsl(226, 58%, 16%) 55%,
            hsl(215, 60%, 20%) 100%);
}

/* 装饰光晕 */
.hero-decorations { position: absolute; inset: 0; pointer-events: none; }

.hdeco {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.35;
}
.hdeco-1 {
    width: 480px; height: 480px;
    background: hsl(215, 85%, 55%);
    top: -160px; left: -100px;
    opacity: 0.20;
}
.hdeco-2 {
    width: 360px; height: 360px;
    background: hsl(195, 80%, 50%);
    bottom: -120px; right: -80px;
    opacity: 0.18;
}
.hdeco-3 {
    width: 200px; height: 200px;
    background: hsl(260, 70%, 65%);
    top: 30%; left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.12;
}

.hero-inner {
    position: relative;
    z-index: 1;
    max-width: 780px;
    margin: 0 auto;
}

/* 顶部标签 */
.hero-badge-top {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 16px;
    background: rgba(255, 255, 255, 0.10);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: rgba(255, 255, 255, 0.90);
    letter-spacing: 0.8px;
    text-transform: uppercase;
    margin-bottom: var(--space-lg);
    backdrop-filter: blur(8px);
}

/* 主标题 */
.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: var(--font-weight-bold);
    color: #ffffff;
    line-height: 1.18;
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.hero-em {
    background: linear-gradient(90deg, hsl(200, 100%, 70%), hsl(215, 100%, 75%));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 副标题 */
.hero-sub {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.70);
    line-height: 1.7;
    margin-bottom: var(--space-2xl);
    max-width: 580px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== 核心搜索框 ===== */
.hero-search-wrap {
    max-width: 640px;
    margin: 0 auto var(--space-lg);
}

.hero-search-form {
    display: flex;
    align-items: center;
    background: #ffffff;
    border-radius: var(--radius-full);
    padding: 6px 6px 6px 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35), 0 2px 8px rgba(0, 0, 0, 0.20);
    gap: 0;
    transition: box-shadow var(--transition-fast);
}

.hero-search-form:focus-within {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.40), 0 0 0 3px rgba(96, 165, 250, 0.5);
}

.hero-search-ico {
    color: var(--color-text-muted);
    font-size: 15px;
    flex-shrink: 0;
    margin-right: 10px;
}

.hero-search-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-size: var(--font-size-base);
    color: var(--color-text);
    padding: 8px 0;
    min-width: 0;
}

.hero-search-input::placeholder {
    color: var(--color-text-muted);
}

.hero-search-btn {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 11px 26px;
    background: linear-gradient(135deg, hsl(215, 85%, 52%), hsl(200, 85%, 48%));
    color: #fff;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    letter-spacing: 0.3px;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.35);
}

.hero-search-btn:hover {
    background: linear-gradient(135deg, hsl(215, 85%, 45%), hsl(200, 85%, 40%));
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.50);
    transform: translateY(-1px);
}

.hero-search-btn:active {
    transform: translateY(0);
}

/* ===== 热门关键词 ===== */
.hero-hot-keys {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
}

.hot-label {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.50);
}

.hot-tag {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.75);
    background: rgba(255, 255, 255, 0.10);
    border: 1px solid rgba(255, 255, 255, 0.18);
    padding: 4px 13px;
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-fast);
    backdrop-filter: blur(4px);
}

.hot-tag:hover {
    background: rgba(255, 255, 255, 0.22);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.35);
    transform: translateY(-1px);
}

/* ============================================================
   统计数据横条
============================================================ */
.stats-bar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg) 0;
}

.stats-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.stats-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 10px;
}

.stats-ico {
    font-size: 2rem;
    opacity: 0.85;
    color: var(--color-primary);
    background: rgba(59, 130, 246, 0.1);
    padding: 12px;
    border-radius: var(--radius-lg);
}

.stats-data {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
}

.stats-num {
    font-family: var(--font-heading);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    line-height: 1;
}

.stats-num em {
    font-style: normal;
    font-size: 0.6em;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
}

.stats-lbl {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.stats-divider {
    width: 1px;
    height: 28px;
    background: var(--color-border);
    flex-shrink: 0;
}

/* ============================================================
   通用 Section
============================================================ */
.home-section {
    padding: var(--space-2xl) 0;
}

/* 节标题行 */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    position: relative;
    padding-left: 14px;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 1.15em;
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
    border-radius: 2px;
}

.section-more {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    transition: gap var(--transition-fast), color var(--transition-fast);
}

.section-more:hover {
    color: var(--color-primary-dark);
    gap: 8px;
}

/* ============================================================
   热门分类
============================================================ */
.categories-section {
    background: var(--color-background);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: var(--space-md);
}

/* 使用 <a> 替代 <div onclick>，更语义化 */
.cat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: var(--space-lg) var(--space-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    outline-offset: 2px;
}

.cat-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary-light), transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.cat-card:hover,
.cat-card:focus-visible {
    border-color: var(--color-primary);
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.14);
}

.cat-card:hover::before,
.cat-card:focus-visible::before {
    opacity: 1;
}

.cat-icon {
    position: relative;
    z-index: 1;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    border-radius: var(--radius-lg);
    font-size: 1.3rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    font-family: var(--font-code);
    transition: all var(--transition-base);
}

.cat-card:hover .cat-icon,
.cat-card:focus-visible .cat-icon {
    background: var(--color-primary);
    color: #fff;
    transform: scale(1.08) rotate(-4deg);
}

.cat-name {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    text-align: center;
}

.cat-count {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* ============================================================
   热门资源
============================================================ */
.resources-section {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-3xl);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

/* ===== 资源卡片（覆盖/增强 components.css）===== */
.resource-card {
    position: relative;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 0;                   /* 去掉旧 padding，改用内部元素控 */
    cursor: pointer;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-xs);
}

.resource-card:hover {
    border-color: hsl(215, 60%, 78%);
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(59, 130, 246, 0.12);
}

.resource-card:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* 顶部彩色条 */
.rc-stripe {
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.resource-card:hover .rc-stripe {
    transform: scaleX(1);
}

/* 内容区 padding */
.rc-head,
.rc-title,
.rc-desc,
.rc-tags,
.rc-foot {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
}

.rc-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-md);
    padding-bottom: 0;
}

.rc-lang {
    display: inline-flex;
    align-items: center;
    padding: 3px 9px;
    font-size: 11px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    background: var(--color-primary-light);
    border: 1px solid hsl(215, 80%, 86%);
    border-radius: var(--radius-sm);
    letter-spacing: 0.3px;
}

.rc-pts {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: hsl(38, 85%, 48%);
    background: hsl(38, 95%, 93%);
    padding: 3px 9px;
    border-radius: var(--radius-full);
}

.rc-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    line-height: 1.4;
    margin: var(--space-sm) 0 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color var(--transition-fast);
}

.resource-card:hover .rc-title {
    color: var(--color-primary);
}

.rc-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin: 8px 0 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.rc-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-top: var(--space-sm);
    padding-bottom: 0;
}

.rc-tag {
    display: inline-flex;
    padding: 2px 8px;
    font-size: 11px;
    background: var(--color-background);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
}

/* 底部 footer */
.rc-foot {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding-top: var(--space-sm);
    padding-bottom: var(--space-md);
    margin-top: var(--space-sm);
    border-top: 1px solid var(--color-border-light);
}

.rc-meta {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.rc-go {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    margin-left: auto;
    opacity: 0;
    transform: translateX(-6px);
    transition: all var(--transition-base);
}

.resource-card:hover .rc-go {
    opacity: 1;
    transform: translateX(0);
}

/* ============================================================
   响应式
============================================================ */

/* ≤1024px 平板 */
@media (max-width: 1024px) {
    .resources-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ≤768px 手机横屏 */
@media (max-width: 768px) {
    .hero-section {
        padding: 52px 0 44px;
    }

    .hero-title {
        font-size: clamp(1.7rem, 7vw, 2.4rem);
    }

    .hero-sub {
        font-size: var(--font-size-base);
    }

    .stats-row {
        gap: var(--space-lg);
    }

    .stats-divider {
        display: none;
    }

    .stats-row {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
        text-align: center;
    }

    .stats-item {
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }

    .stats-data {
        align-items: center;
    }

    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ≤600px 手机竖屏 */
@media (max-width: 600px) {
    .resources-grid {
        grid-template-columns: 1fr;
    }
}

/* ≤480px 极小屏 */
@media (max-width: 480px) {
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-row {
        grid-template-columns: repeat(2, 1fr);
    }
}