/*
 * 星火启元 AI频道共享样式
 * channels/ 目录下所有页面共用
 * 依赖: subdomain-common.css (基础暗色科技风)
 */

/* ====== 导航下拉菜单（子站公共样式中未包含） ====== */
nav li { position: relative; }
.submenu-content {
    display: none;
    position: absolute;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    min-width: 170px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    z-index: 1;
    border-radius: 12px;
    top: 100%;
    left: 0;
    border: 1px solid var(--glass-border);
    overflow: hidden;
    padding: 6px 0;
}
.submenu-content a {
    color: rgba(255,255,255,0.8);
    padding: 10px 16px;
    display: block;
    font-size: 0.9rem;
}
.submenu-content a:hover {
    background: rgba(99,102,241,0.15);
    color: #c7d2fe;
}
.submenu-content a::after { display: none; }
.submenu:hover .submenu-content { display: block; }

/* 频道下拉菜单 - 两列布局 */
.channels-submenu .submenu-content {
    min-width: 380px;
    display: none;
    grid-template-columns: 1fr 1fr;
    padding: 8px 0;
}
.channels-submenu:hover .submenu-content {
    display: grid;
}

/* ====== 频道英雄区 ====== */
.channel-hero {
    color: white;
    text-align: center;
    padding: 5rem 0 3rem;
    position: relative;
}

.channel-badge {
    display: inline-block;
    background: rgba(99,102,241,0.15);
    color: #818cf8;
    font-size: 0.85rem;
    padding: 4px 16px;
    border-radius: 20px;
    margin-bottom: 1.5rem;
    letter-spacing: 1px;
}

.channel-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    display: block;
}

.channel-hero h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    font-weight: 700;
    line-height: 1.3;
    background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 40%, #a5b4fc 70%, #818cf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.channel-hero p {
    font-size: 1.15rem;
    max-width: 700px;
    margin: 0 auto 1.5rem;
    color: #94a3b8;
    line-height: 1.8;
}

.channel-hero .channel-vision {
    font-size: 0.9rem;
    color: #a5b4fc;
    font-style: italic;
    letter-spacing: 1px;
}

/* ====== 频道亮点区 ====== */
.channel-features {
    padding: 4rem 0;
}

/* ====== 工具推荐卡片 ====== */
.tool-recommends {
    padding: 4rem 0;
}

.tool-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: var(--grad-card-border);
    opacity: 0;
    transition: opacity 0.4s;
}

.tool-card:hover {
    transform: translateY(-8px);
    border-color: rgba(99,102,241,0.3);
    box-shadow: var(--shadow-glow);
    background: rgba(255,255,255,0.1);
}
.tool-card:hover::before { opacity: 1; }

.tool-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.6rem;
    color: #e0e7ff;
    font-weight: 600;
}

.tool-card p {
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 0.8rem;
}

.tool-card .tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    margin-bottom: 1rem;
}

.tool-tag {
    display: inline-block;
    background: rgba(99,102,241,0.12);
    color: #818cf8;
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 10px;
}

.tool-card .tool-link {
    display: inline-block;
    color: #818cf8;
    font-size: 0.9rem;
    text-decoration: none;
    border-bottom: 1px dashed #818cf8;
    transition: all 0.3s;
}
.tool-card .tool-link:hover {
    color: #c7d2fe;
    border-color: #c7d2fe;
}

/* ====== 相关文章区（暗色版） ====== */
.related-articles {
    padding: 4rem 0;
}

.article-card-dark {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: all 0.3s;
}

.article-card-dark:hover {
    transform: translateY(-3px);
    border-color: rgba(99,102,241,0.3);
    box-shadow: 0 0 20px rgba(99,102,241,0.15);
}

.article-card-dark a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.article-card-dark h3 {
    font-size: 1.1rem;
    color: #e0e7ff;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.article-card-dark p {
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 0.8rem;
}

.article-card-dark .article-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
    color: #64748b;
}

/* ====== 学习资源区 ====== */
.related-resources {
    padding: 3rem 0;
    text-align: center;
}

.resource-link {
    display: inline-block;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.2rem 2rem;
    color: #e0e7ff;
    text-decoration: none;
    font-size: 1rem;
    transition: all 0.3s;
    margin: 0.5rem;
}

.resource-link:hover {
    border-color: rgba(99,102,241,0.3);
    box-shadow: var(--shadow-glow);
    transform: translateY(-3px);
}

/* ====== 相关频道导航 ====== */
.related-channels {
    padding: 4rem 0;
}

.channel-nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.2rem;
}

.channel-nav-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
}

.channel-nav-card:hover {
    transform: translateY(-4px);
    border-color: rgba(99,102,241,0.3);
    box-shadow: var(--shadow-glow);
    background: rgba(255,255,255,0.08);
}

.channel-nav-card .channel-nav-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    display: block;
}

.channel-nav-card h3 {
    font-size: 1.1rem;
    color: #e0e7ff;
    margin-bottom: 0.3rem;
    font-weight: 600;
}

.channel-nav-card p {
    color: #94a3b8;
    font-size: 0.85rem;
}

/* ====== 愿景横幅 ====== */
.vision-banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 3rem 2rem;
    text-align: center;
}

.vision-text {
    font-size: 1.8rem;
    color: #fff;
    letter-spacing: 3px;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.vision-text-en {
    font-size: 1rem;
    color: rgba(255,255,255,0.8);
    letter-spacing: 1px;
    font-style: italic;
}

/* ====== 频道总览页专用 ====== */
.channels-hero {
    color: white;
    text-align: center;
    padding: 5rem 0 3rem;
}

.channels-hero h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    font-weight: 700;
    background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 40%, #a5b4fc 70%, #818cf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.channels-hero p {
    font-size: 1.15rem;
    color: #94a3b8;
    max-width: 700px;
    margin: 0 auto 2rem;
    line-height: 1.8;
}

/* 频道统计 */
.channel-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.channel-stat {
    text-align: center;
}

.channel-stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    display: block;
    background: linear-gradient(135deg, #06b6d4, #f59e0b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.channel-stat-label {
    font-size: 0.9rem;
    color: #94a3b8;
}

/* 频道分类区块 */
.channel-category {
    padding: 2rem 0;
}

.channel-category-title {
    font-size: 1.15rem;
    color: #94a3b8;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid;
    border-image: linear-gradient(90deg, var(--c-primary), var(--c-accent)) 1;
    font-weight: 600;
}

/* 频道卡片（暗色版本） */
.channel-overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.channel-overview-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    text-decoration: none;
    color: inherit;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.channel-overview-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: var(--grad-card-border);
    opacity: 0;
    transition: opacity 0.4s;
}

.channel-overview-card:hover {
    transform: translateY(-8px);
    border-color: rgba(99,102,241,0.3);
    box-shadow: var(--shadow-glow);
    background: rgba(255,255,255,0.1);
}
.channel-overview-card:hover::before { opacity: 1; }

.channel-overview-card .channel-overview-icon {
    font-size: 2.5rem;
    margin-bottom: 0.8rem;
    display: block;
}

.channel-overview-card h3 {
    font-size: 1.2rem;
    color: #e0e7ff;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.channel-overview-card p {
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ====== 响应式 ====== */
@media (max-width: 768px) {
    .channel-hero h1, .channels-hero h1 { font-size: 1.8rem; }
    .channel-hero { padding: 3rem 0 2rem; }
    .channels-submenu .submenu-content {
        min-width: 280px;
        grid-template-columns: 1fr;
    }
    .channels-submenu:hover .submenu-content {
        display: block;
    }
    .channel-stats { gap: 1.5rem; }
    .channel-stat-number { font-size: 1.8rem; }
    .vision-text { font-size: 1.3rem; letter-spacing: 1px; }
    .vision-text-en { font-size: 0.85rem; }
}