/* ========================================
   TelegramHub 自定义样式
   ======================================== */

/* ========== CSS 变量 ========== */
:root {
    --tg-primary: #229ED9;
    --tg-primary-dark: #1a7ab5;
    --tg-primary-light: #e8f6fd;
    --tg-accent: #0088cc;
    --tg-dark: #1a1a2e;
    --tg-dark-card: #16213e;
    --tg-dark-text: #e0e0e0;
    --tg-bg: #ffffff;
    --tg-bg-secondary: #f8f9fa;
    --tg-text: #2c3e50;
    --tg-muted: #6c757d;
    --tg-border: #dee2e6;
    --tg-radius: 12px;
    --tg-shadow: 0 2px 8px rgba(0,0,0,0.08);
    --tg-shadow-hover: 0 8px 25px rgba(0,0,0,0.12);
    --tg-transition: all 0.3s ease;
}

/* ========== 暗黑模式变量 ========== */
[data-theme="dark"] {
    --tg-bg: #1a1a2e;
    --tg-bg-secondary: #16213e;
    --tg-text: #e0e0e0;
    --tg-muted: #9ca3af;
    --tg-border: #2d3748;
    --tg-shadow: 0 2px 8px rgba(0,0,0,0.3);
    --tg-shadow-hover: 0 8px 25px rgba(0,0,0,0.4);
}

/* ========== 全局 ========== */
body {
    background-color: var(--tg-bg);
    color: var(--tg-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    line-height: 1.8;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--tg-primary);
    transition: var(--tg-transition);
}
a:hover {
    color: var(--tg-primary-dark);
}

::selection {
    background-color: var(--tg-primary);
    color: #fff;
}

/* ========== 导航栏 ========== */
.bg-tg-primary {
    background-color: var(--tg-primary) !important;
}

.navbar .nav-link {
    color: rgba(255,255,255,0.85);
    font-size: 0.95rem;
    padding: 0.5rem 0.9rem;
    border-radius: 6px;
    transition: var(--tg-transition);
}
.navbar .nav-link:hover,
.navbar .nav-link.active {
    color: #fff;
    background-color: rgba(255,255,255,0.15);
}

.navbar-brand {
    font-size: 1.25rem;
}

#themeToggle {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    border-radius: 50%;
    transition: var(--tg-transition);
}
#themeToggle:hover {
    background-color: rgba(255,255,255,0.2);
    transform: rotate(15deg);
}

/* ========== Hero 区 ========== */
.hero-section {
    background: linear-gradient(135deg, #229ED9 0%, #1a7ab5 50%, #0d5f8a 100%);
    min-height: 70vh;
    position: relative;
    overflow: hidden;
}
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

[data-theme="dark"] .hero-section {
    background: linear-gradient(135deg, #1a7ab5 0%, #0d5f8a 50%, #0a4a6e 100%);
}

/* ========== 按钮 ========== */
.btn-tg-primary {
    background-color: var(--tg-primary);
    border-color: var(--tg-primary);
    color: #fff;
    border-radius: 8px;
    font-weight: 500;
    transition: var(--tg-transition);
}
.btn-tg-primary:hover {
    background-color: var(--tg-primary-dark);
    border-color: var(--tg-primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--tg-shadow-hover);
}

.btn-tg-accent {
    background-color: #fff;
    color: var(--tg-primary);
    border-radius: 50px;
    font-weight: 600;
    transition: var(--tg-transition);
}
.btn-tg-accent:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
    color: var(--tg-primary-dark);
}

.btn-outline-tg {
    border-color: var(--tg-primary);
    color: var(--tg-primary);
    border-radius: 8px;
}
.btn-outline-tg:hover {
    background-color: var(--tg-primary);
    border-color: var(--tg-primary);
    color: #fff;
}

/* ========== 区块背景 ========== */
.bg-tg-section {
    background-color: var(--tg-bg-secondary);
}

.text-tg-muted {
    color: var(--tg-muted) !important;
}

.text-tg-primary {
    color: var(--tg-primary) !important;
}

.border-tg {
    border-color: var(--tg-border) !important;
}

/* ========== 下载卡片 ========== */
.download-card {
    border-radius: var(--tg-radius);
    transition: var(--tg-transition);
    cursor: pointer;
}
.download-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--tg-shadow-hover);
}
.download-icon {
    font-size: 2.5rem;
    line-height: 1;
}
.download-card h6 {
    font-size: 0.95rem;
}

/* ========== 特色卡片 ========== */
.feature-card {
    border-radius: var(--tg-radius);
    transition: var(--tg-transition);
}
.feature-card:hover {
    background-color: var(--tg-bg-secondary);
    transform: translateY(-3px);
}
.feature-icon {
    font-size: 2.5rem;
    line-height: 1;
}

/* ========== 文章卡片 ========== */
.post-card {
    border-radius: var(--tg-radius);
    overflow: hidden;
    transition: var(--tg-transition);
}
.post-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--tg-shadow-hover);
}
.post-card:hover .card-title {
    color: var(--tg-primary) !important;
}

/* ========== 文章列表 ========== */
.post-list-item {
    transition: var(--tg-transition);
}
.post-list-item:hover {
    background-color: var(--tg-bg-secondary);
    border-radius: 8px;
    margin: 0 -12px;
    padding-left: 12px;
    padding-right: 12px;
}

/* ========== 文章内容 ========== */
.article-content {
    font-size: 1.05rem;
    line-height: 2;
}
.article-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--tg-primary);
    color: var(--tg-text);
}
.article-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.8rem;
    color: var(--tg-text);
}
.article-content p {
    margin-bottom: 1.2rem;
}
.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5rem 0;
}
.article-content ul, .article-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1.2rem;
}
.article-content li {
    margin-bottom: 0.5rem;
}
.article-content blockquote {
    border-left: 4px solid var(--tg-primary);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    background-color: var(--tg-bg-secondary);
    border-radius: 0 8px 8px 0;
    color: var(--tg-muted);
}
.article-content code {
    background-color: var(--tg-bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}
.article-content pre {
    background-color: #1e1e2e;
    color: #cdd6f4;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
}
.article-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

/* ========== 标签 ========== */
.bg-tg-tag {
    background-color: var(--tg-primary-light) !important;
    color: var(--tg-primary) !important;
}
[data-theme="dark"] .bg-tg-tag {
    background-color: rgba(34, 158, 217, 0.2) !important;
}

/* ========== FAQ 手风琴 ========== */
.accordion-button:not(.collapsed) {
    background-color: var(--tg-primary-light);
    color: var(--tg-primary);
    font-weight: 600;
}
[data-theme="dark"] .accordion-button:not(.collapsed) {
    background-color: rgba(34, 158, 217, 0.15);
    color: var(--tg-primary);
}
.accordion-button:focus {
    box-shadow: 0 0 0 0.2rem rgba(34, 158, 217, 0.25);
}
.accordion-button {
    font-weight: 500;
    color: var(--tg-text);
}
.accordion-body {
    line-height: 1.8;
}

/* ========== 侧边栏 Widget ========== */
.widget-item {
    border-radius: var(--tg-radius);
    overflow: hidden;
    border: 1px solid var(--tg-border);
}
.widget-item .card-header {
    background-color: var(--tg-primary);
    color: #fff;
    border-bottom: none;
    padding: 0.75rem 1rem;
}

/* ========== 404 页面 ========== */
.error-404 h1 {
    font-size: 8rem;
    line-height: 1;
    opacity: 0.3;
}

/* ========== 搜索表单 ========== */
.search-form {
    display: inline-flex;
}
.search-form .search-field {
    border: 1px solid var(--tg-border);
    border-radius: 8px 0 0 8px;
    padding: 0.4rem 0.8rem;
    background-color: var(--tg-bg);
    color: var(--tg-text);
}
.search-form .search-submit {
    border: none;
    background-color: var(--tg-primary);
    color: #fff;
    border-radius: 0 8px 8px 0;
    padding: 0.4rem 1rem;
    cursor: pointer;
}

/* ========== Footer ========== */
.bg-tg-dark {
    background-color: var(--tg-dark) !important;
}
.footer-links li a {
    color: #9ca3af;
    transition: var(--tg-transition);
}
.footer-links li a:hover {
    color: #fff;
    padding-left: 5px;
}

/* ========== 面包屑 ========== */
.breadcrumb-item a {
    color: var(--tg-primary);
}
.breadcrumb-item.active {
    color: var(--tg-muted);
}
.breadcrumb-item + .breadcrumb-item::before {
    color: var(--tg-muted);
}

/* ========== 分页 ========== */
.page-link {
    color: var(--tg-primary);
    border-color: var(--tg-border);
}
.page-link:hover {
    background-color: var(--tg-primary);
    border-color: var(--tg-primary);
    color: #fff;
}
.page-item.active .page-link {
    background-color: var(--tg-primary);
    border-color: var(--tg-primary);
}

/* ========== 文章导航 ========== */
.post-navigation a:hover .fw-semibold {
    color: var(--tg-primary) !important;
}

/* ========== 回到顶部 ========== */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background-color: var(--tg-primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--tg-transition);
    z-index: 999;
    box-shadow: var(--tg-shadow);
}
#backToTop.show {
    opacity: 1;
    visibility: visible;
}
#backToTop:hover {
    transform: translateY(-3px);
    box-shadow: var(--tg-shadow-hover);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .hero-section {
        min-height: 50vh;
        padding: 3rem 0;
    }
    .hero-section h1 {
        font-size: 2rem;
    }
    .hero-section .lead {
        font-size: 1rem;
    }
    .download-icon {
        font-size: 2rem;
    }
    .article-content h2 {
        font-size: 1.3rem;
    }
    .post-list-item .flex-shrink-0 {
        display: none;
    }
    #backToTop {
        bottom: 20px;
        right: 20px;
        width: 38px;
        height: 38px;
    }
}

@media (max-width: 576px) {
    .hero-section h1 {
        font-size: 1.5rem;
    }
    .hero-section .btn-lg {
        padding: 0.6rem 1.5rem;
        font-size: 0.9rem;
    }
}