/* =============================================
   Pi中文网 - 主样式表
   主色: #0078D7 | 辅色: #ffc107 | 文字: #333
   基于 Bootstrap 5 扩展
   ============================================= */

/* ---------- 全局重置与基础 ---------- */
:root {
    --pi-primary: #0078D7;
    --pi-secondary: #ffc107;
    --pi-dark: #1a1a2e;
    --pi-text: #333333;
    --pi-text-light: #666666;
    --pi-border: #e0e0e0;
    --pi-radius: 8px;
    --pi-shadow: 0 2px 8px rgba(0,0,0,0.08);
    --pi-shadow-hover: 0 6px 20px rgba(0,0,0,0.12);
    --pi-transition: all 0.3s ease;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--pi-text);
    background-color: #f5f6fa;
    line-height: 1.6;
}

a {
    color: var(--pi-primary);
    transition: var(--pi-transition);
}

a:hover {
    color: #005bb5;
}

/* ---------- 顶部公告栏 ---------- */
.top-bar {
    font-size: 0.85rem;
}

.top-bar a {
    color: rgba(255, 255, 255, 0.85);
    transition: var(--pi-transition);
}

.top-bar a:hover {
    color: #ffffff;
    text-decoration: underline !important;
}

/* ---------- 导航栏增强 ---------- */
.navbar {
    box-shadow: 0 2px 12px rgba(0, 120, 215, 0.25);
}

.navbar-brand {
    font-size: 1.3rem;
    letter-spacing: 0.5px;
}

.navbar-nav .nav-link {
    font-size: 0.95rem;
    padding: 0.5rem 0.9rem;
    border-radius: var(--pi-radius);
    transition: var(--pi-transition);
}

.navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.navbar-nav .nav-link.active {
    background-color: rgba(255, 255, 255, 0.15);
}

.dropdown-menu {
    border: none;
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow-hover);
    padding: 0.5rem;
}

.dropdown-item {
    border-radius: 6px;
    padding: 0.45rem 1rem;
    font-size: 0.9rem;
    transition: var(--pi-transition);
}

.dropdown-item:hover {
    background-color: var(--pi-primary);
    color: #fff;
}

/* 搜索框 */
.navbar .input-group {
    max-width: 260px;
}

.navbar .form-control:focus {
    border-color: var(--pi-secondary);
    box-shadow: 0 0 0 2px rgba(255, 193, 7, 0.3);
}

/* ---------- 主内容区 ---------- */
main {
    min-height: calc(100vh - 200px);
}

/* ---------- Hero 轮播区域 ---------- */
.hero-slider {
    background: linear-gradient(135deg, #0078D7 0%, #005bb5 100%);
    border-radius: var(--pi-radius);
    overflow: hidden;
    position: relative;
    margin-bottom: 2rem;
}

.hero-slider .carousel-item img {
    height: 380px;
    object-fit: cover;
    width: 100%;
}

.hero-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: #fff;
}

.hero-overlay h3 {
    font-weight: 700;
    margin-bottom: 0.3rem;
}

.hero-overlay p {
    font-size: 0.9rem;
    opacity: 0.85;
    margin-bottom: 0;
}

.carousel-control-prev,
.carousel-control-next {
    width: 5%;
    opacity: 0.7;
}

.carousel-indicators button {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

/* ---------- Pi 实时行情卡片 ---------- */
.pi-market {
    background: linear-gradient(135deg, #0078D7 0%, #00a0e9 100%);
    border-radius: var(--pi-radius);
    padding: 1.2rem 1.5rem;
    color: #fff;
    margin-bottom: 1.5rem;
    box-shadow: var(--pi-shadow);
}

.pi-market h4 {
    font-size: 0.85rem;
    font-weight: 600;
    opacity: 0.8;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.pi-market .price-value {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.1;
}

.pi-market .price-usd {
    font-size: 0.85rem;
    opacity: 0.7;
    margin-left: 0.3rem;
}

.pi-market .price-change {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

.pi-market .price-change.up {
    background-color: rgba(76, 175, 80, 0.25);
    color: #a5d6a7;
}

.pi-market .price-change.down {
    background-color: rgba(244, 67, 54, 0.25);
    color: #ef9a9a;
}

.pi-market .market-row {
    display: flex;
    gap: 1.5rem;
    margin-top: 0.8rem;
    font-size: 0.8rem;
    opacity: 0.8;
}

.pi-market .market-row span {
    white-space: nowrap;
}

/* ---------- 文章卡片 ---------- */
.card-article {
    background: #fff;
    border: none;
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow);
    transition: var(--pi-transition);
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card-article:hover {
    transform: translateY(-4px);
    box-shadow: var(--pi-shadow-hover);
}

.card-article .card-img-wrap {
    position: relative;
    overflow: hidden;
    height: 180px;
}

.card-article .card-img-top {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.card-article:hover .card-img-top {
    transform: scale(1.05);
}

.card-article .card-badge {
    position: absolute;
    top: 0.6rem;
    left: 0.6rem;
}

.card-article .card-body {
    padding: 1rem 1.1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-article .card-title {
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 0.5rem;
    color: var(--pi-text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-article .card-title a {
    color: inherit;
    text-decoration: none;
}

.card-article .card-title a:hover {
    color: var(--pi-primary);
}

.card-article .card-text {
    font-size: 0.85rem;
    color: var(--pi-text-light);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
    margin-bottom: 0.8rem;
}

.card-article .card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.78rem;
    color: #999;
    border-top: 1px solid #f0f0f0;
    padding-top: 0.6rem;
    margin-top: auto;
}

.card-article .card-meta .author {
    color: var(--pi-primary);
    font-weight: 500;
}

.card-article .card-meta .stats {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

.card-article .card-meta .stats i {
    margin-right: 2px;
}

/* 列表模式文章 */
.list-article {
    display: flex;
    gap: 1rem;
    background: #fff;
    border-radius: var(--pi-radius);
    padding: 1rem;
    box-shadow: var(--pi-shadow);
    transition: var(--pi-transition);
    margin-bottom: 0.8rem;
}

.list-article:hover {
    box-shadow: var(--pi-shadow-hover);
    transform: translateX(4px);
}

.list-article .list-img {
    width: 120px;
    height: 80px;
    object-fit: cover;
    border-radius: 6px;
    flex-shrink: 0;
}

.list-article .list-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.list-article .list-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--pi-text);
    margin-bottom: 0.3rem;
    text-decoration: none;
}

.list-article .list-title:hover {
    color: var(--pi-primary);
}

.list-article .list-desc {
    font-size: 0.82rem;
    color: var(--pi-text-light);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 0.3rem;
}

/* ---------- 热文推荐 ---------- */
.hot-articles {
    background: #fff;
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow);
    padding: 1.2rem;
    margin-bottom: 1.5rem;
}

.hot-articles h5 {
    font-weight: 700;
    font-size: 1rem;
    color: var(--pi-text);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--pi-secondary);
    display: inline-block;
}

.hot-articles .hot-item {
    display: flex;
    gap: 0.7rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid #f0f0f0;
    align-items: flex-start;
}

.hot-articles .hot-item:last-child {
    border-bottom: none;
}

.hot-articles .hot-num {
    width: 22px;
    height: 22px;
    background: var(--pi-primary);
    color: #fff;
    border-radius: 50%;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: 700;
}

.hot-articles .hot-num.top3 {
    background: var(--pi-secondary);
    color: #333;
}

.hot-articles .hot-title {
    font-size: 0.88rem;
    color: var(--pi-text);
    text-decoration: none;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.hot-articles .hot-title:hover {
    color: var(--pi-primary);
}

.hot-articles .hot-views {
    font-size: 0.75rem;
    color: #999;
    margin-top: 2px;
}

/* ---------- 钱包地址查询框 ---------- */
.search-box {
    background: #fff;
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow);
    padding: 1.2rem;
    margin-bottom: 1.5rem;
}

.search-box h5 {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 0.8rem;
}

.search-box .form-control {
    border-radius: 6px;
    font-size: 0.85rem;
    border-color: var(--pi-border);
}

.search-box .form-control:focus {
    border-color: var(--pi-primary);
    box-shadow: 0 0 0 3px rgba(0, 120, 215, 0.15);
}

.search-box .btn-primary {
    background-color: var(--pi-primary);
    border-color: var(--pi-primary);
    border-radius: 6px;
}

.search-box .btn-primary:hover {
    background-color: #005bb5;
    border-color: #005bb5;
}

/* ---------- 标签云 ---------- */
.tag-cloud {
    background: #fff;
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow);
    padding: 1.2rem;
    margin-bottom: 1.5rem;
}

.tag-cloud h5 {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 0.8rem;
}

.tag-cloud .tag-item {
    display: inline-block;
    padding: 0.25rem 0.65rem;
    background: #f0f4f8;
    color: var(--pi-text-light);
    border-radius: 20px;
    font-size: 0.78rem;
    margin: 0.2rem;
    text-decoration: none;
    transition: var(--pi-transition);
}

.tag-cloud .tag-item:hover {
    background: var(--pi-primary);
    color: #fff;
}

.tag-cloud .tag-item.active {
    background: var(--pi-secondary);
    color: #333;
    font-weight: 600;
}

/* ---------- 大事记时间线 ---------- */
.milestone-timeline {
    position: relative;
    padding-left: 2rem;
    margin: 1.5rem 0;
}

.milestone-timeline::before {
    content: '';
    position: absolute;
    left: 0.6rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--pi-primary), var(--pi-secondary));
}

.milestone-item {
    position: relative;
    margin-bottom: 1.5rem;
    padding-left: 1.2rem;
}

.milestone-item::before {
    content: '';
    position: absolute;
    left: -1.5rem;
    top: 0.3rem;
    width: 12px;
    height: 12px;
    background: var(--pi-primary);
    border-radius: 50%;
    border: 3px solid #fff;
    box-shadow: 0 0 0 2px var(--pi-primary);
}

.milestone-item .milestone-date {
    font-size: 0.78rem;
    color: var(--pi-primary);
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.milestone-item .milestone-title {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 0.3rem;
    color: var(--pi-text);
}

.milestone-item .milestone-desc {
    font-size: 0.85rem;
    color: var(--pi-text-light);
    line-height: 1.5;
}

/* ---------- 底部样式 ---------- */
.site-footer {
    font-size: 0.9rem;
}

.site-footer a {
    color: #aaa;
    transition: var(--pi-transition);
}

.site-footer a:hover {
    color: var(--pi-secondary);
}

.site-footer h5,
.site-footer h6 {
    font-weight: 700;
}

.site-footer hr {
    opacity: 0.2;
}

/* ---------- 分页样式 ---------- */
.pagination {
    margin-top: 2rem;
}

.pagination .page-link {
    color: var(--pi-primary);
    border-color: #ddd;
    border-radius: 6px;
    margin: 0 2px;
    font-size: 0.9rem;
}

.pagination .page-link:hover {
    background-color: var(--pi-primary);
    border-color: var(--pi-primary);
    color: #fff;
}

.pagination .page-item.active .page-link {
    background-color: var(--pi-primary);
    border-color: var(--pi-primary);
}

/* ---------- 区块标题栏 ---------- */
.section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.2rem;
}

.section-title h3 {
    font-weight: 800;
    font-size: 1.2rem;
    margin: 0;
    color: var(--pi-text);
}

.section-title h3::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 1.1em;
    background: var(--pi-primary);
    border-radius: 2px;
    margin-right: 0.5rem;
    vertical-align: middle;
}

.section-title .more-link {
    font-size: 0.85rem;
    color: var(--pi-primary);
    text-decoration: none;
    font-weight: 500;
}

.section-title .more-link:hover {
    text-decoration: underline;
}

/* ---------- 辅助类 ---------- */
.badge-pi {
    background-color: var(--pi-primary);
    color: #fff;
    font-size: 0.72rem;
    padding: 0.25rem 0.55rem;
    border-radius: 20px;
    font-weight: 600;
}

.badge-hot {
    background-color: #ff4757;
    color: #fff;
    font-size: 0.72rem;
    padding: 0.25rem 0.55rem;
    border-radius: 20px;
    font-weight: 600;
}

.text-up { color: #4caf50 !important; }
.text-down { color: #f44336 !important; }

/* ---------- 响应式断点 ---------- */
@media (max-width: 991.98px) {
    .hero-slider .carousel-item img {
        height: 280px;
    }

    .navbar .input-group {
        max-width: 100%;
        margin-top: 0.5rem;
    }

    .navbar-collapse {
        background: rgba(0, 120, 215, 0.95);
        padding: 0.8rem;
        border-radius: var(--pi-radius);
        margin-top: 0.5rem;
    }
}

@media (max-width: 767.98px) {
    .hero-slider .carousel-item img {
        height: 200px;
    }

    .pi-market .price-value {
        font-size: 1.5rem;
    }

    .card-article .card-img-wrap {
        height: 160px;
    }

    .list-article .list-img {
        width: 90px;
        height: 65px;
    }

    .section-title h3 {
        font-size: 1.05rem;
    }

    .milestone-timeline {
        padding-left: 1.5rem;
    }
}

@media (max-width: 575.98px) {
    .top-bar .container {
        flex-direction: column;
        gap: 0.3rem;
        text-align: center;
    }

    .hero-slider {
        border-radius: 0;
        margin-left: -0.75rem;
        margin-right: -0.75rem;
    }

    .card-article .card-img-wrap {
        height: 140px;
    }

    .pi-market .market-row {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--pi-primary);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #005bb5;
}