/* ===== 全局重置 & 基础 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
    color: #333;
    background: #f8f9fa;
    line-height: 1.7;
    transition: background 0.4s, color 0.4s;
}

a {
    color: #1a3a6b;
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #c0392b;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ===== 导航吸顶 ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
    padding: 10px 0;
    transition: background 0.4s;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}

.navbar .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 700;
    color: #1a3a6b;
}

.navbar .logo svg {
    width: 40px;
    height: 40px;
}

.navbar .nav-links {
    display: flex;
    gap: 20px;
    list-style: none;
    font-size: 0.95rem;
}

.navbar .nav-links li a {
    padding: 5px 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s, color 0.3s;
    position: relative;
}

.navbar .nav-links li a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #1a3a6b, #c0392b);
    transition: width 0.3s;
}

.navbar .nav-links li a:hover::after {
    width: 100%;
}

.navbar .nav-links li a:hover {
    color: #c0392b;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: #1a3a6b;
    padding: 4px 8px;
    border-radius: 8px;
    transition: background 0.3s;
}

.menu-toggle:hover {
    background: rgba(26, 58, 107, 0.08);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .navbar .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 10px;
        padding: 15px 0;
        border-top: 1px solid rgba(0, 0, 0, 0.08);
        margin-top: 10px;
    }

    .navbar .nav-links.open {
        display: flex;
    }
}

/* ===== 面包屑 ===== */
.breadcrumb {
    background: rgba(240, 242, 245, 0.8);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    padding: 10px 0;
    font-size: 0.9rem;
}

.breadcrumb a {
    color: #1a3a6b;
}

.breadcrumb span {
    color: #666;
}

/* ===== Banner 轮播 (渐变) ===== */
.banner {
    position: relative;
    overflow: hidden;
    height: 420px;
    background: linear-gradient(135deg, #1a3a6b 0%, #2a5a8b 50%, #c0392b 100%);
    background-size: 200% 200%;
    animation: gradientShift 12s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    color: #fff;
    text-align: center;
}

.banner-slide.active {
    opacity: 1;
}

.banner-slide h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
    letter-spacing: 1px;
}

.banner-slide p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.95;
}

.banner-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
}

.banner-dots span {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: background 0.3s, transform 0.3s;
    backdrop-filter: blur(2px);
}

.banner-dots span.active {
    background: #fff;
    transform: scale(1.2);
}

.banner-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.25);
    padding: 12px 18px;
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: 50%;
    z-index: 10;
    transition: background 0.3s, transform 0.3s;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.banner-btn.prev {
    left: 15px;
}

.banner-btn.next {
    right: 15px;
}

@media (max-width: 768px) {
    .banner {
        height: 300px;
    }
    .banner-slide h2 {
        font-size: 1.8rem;
    }
    .banner-slide p {
        font-size: 1rem;
    }
    .banner-btn {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
        padding: 0;
    }
}

/* ===== 通用模块 ===== */
.section {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    color: #1a3a6b;
    margin-bottom: 15px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #1a3a6b, #c0392b);
    margin: 12px auto 0;
    border-radius: 4px;
}

.section-sub {
    text-align: center;
    color: #666;
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    font-size: 1.05rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

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

/* ===== 卡片 (毛玻璃 + 圆角 + hover) ===== */
.card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.4s, background 0.4s;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.12);
    background: rgba(255, 255, 255, 0.9);
}

.card svg {
    width: 50px;
    height: 50px;
    margin-bottom: 15px;
}

.card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #1a3a6b;
}

.card p {
    color: #555;
    font-size: 0.95rem;
}

.btn {
    display: inline-block;
    background: linear-gradient(135deg, #1a3a6b, #2a5a8b);
    color: #fff;
    padding: 12px 28px;
    border-radius: 30px;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
    box-shadow: 0 4px 12px rgba(26, 58, 107, 0.3);
    border: none;
    cursor: pointer;
}

.btn:hover {
    background: linear-gradient(135deg, #c0392b, #e74c3c);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(192, 57, 43, 0.35);
    color: #fff;
}

/* ===== 品牌介绍 ===== */
.brand-intro {
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.4);
}

.brand-intro .flex {
    display: flex;
    gap: 40px;
    align-items: center;
    flex-wrap: wrap;
}

.brand-intro .text {
    flex: 2;
    min-width: 280px;
}

.brand-intro .side {
    flex: 1;
    min-width: 200px;
    background: rgba(240, 244, 248, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 16px;
    padding: 25px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.brand-intro .side h4 {
    color: #1a3a6b;
    margin-bottom: 10px;
    font-size: 1.05rem;
}

.brand-intro .side ul {
    list-style: none;
}

.brand-intro .side ul li {
    padding: 5px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    font-size: 0.9rem;
}

.brand-intro .side ul li:last-child {
    border: 0;
}

/* ===== 文章列表 ===== */
.article-list article {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 22px;
    margin-bottom: 20px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.article-list article:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.9);
}

.article-list article h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: #1a3a6b;
}

.article-list article .meta {
    font-size: 0.85rem;
    color: #999;
    margin-bottom: 8px;
}

.article-list article p {
    color: #555;
    font-size: 0.95rem;
}

.article-list article .read-more {
    color: #c0392b;
    font-weight: 600;
    display: inline-block;
    transition: transform 0.3s;
}

.article-list article .read-more:hover {
    transform: translateX(4px);
}

/* ===== FAQ ===== */
.faq-item {
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 14px;
    margin-bottom: 12px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: background 0.3s;
}

.faq-question {
    background: rgba(247, 249, 252, 0.7);
    padding: 16px 22px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s;
    font-size: 0.98rem;
}

.faq-question:hover {
    background: rgba(238, 242, 247, 0.9);
}

.faq-question .icon {
    font-size: 1.2rem;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    color: #1a3a6b;
}

.faq-answer {
    padding: 0 22px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.4s ease;
    background: rgba(255, 255, 255, 0.4);
    color: #555;
    line-height: 1.8;
}

.faq-item.open .faq-answer {
    max-height: 600px;
    padding: 16px 22px;
}

.faq-item.open .faq-question .icon {
    transform: rotate(180deg);
}

/* ===== HowTo ===== */
.howto-steps {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 35px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.howto-steps ol {
    padding-left: 25px;
}

.howto-steps ol li {
    margin-bottom: 15px;
    padding-left: 8px;
}

.howto-steps ol li strong {
    color: #1a3a6b;
}

.howto-steps ul {
    padding-left: 20px;
}

.howto-steps ul li {
    margin-bottom: 8px;
}

/* ===== 数字动画 ===== */
.stats {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 30px;
    text-align: center;
    padding: 40px 0;
}

.stats .stat h3 {
    font-size: 2.5rem;
    color: #1a3a6b;
    margin-bottom: 5px;
    font-weight: 800;
}

.stats .stat p {
    color: #666;
    font-weight: 600;
    font-size: 0.95rem;
}

/* ===== 返回顶部 ===== */
.back-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1a3a6b, #2a5a8b);
    color: #fff;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    z-index: 999;
    transition: opacity 0.3s, transform 0.3s, background 0.3s;
}

.back-top.show {
    display: flex;
}

.back-top:hover {
    transform: translateY(-3px) scale(1.05);
    background: linear-gradient(135deg, #c0392b, #e74c3c);
}

/* ===== 暗黑模式 ===== */
.dark-mode-toggle {
    position: fixed;
    bottom: 100px;
    right: 40px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1a3a6b, #2a5a8b);
    color: #fff;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 999;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s, background 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
}

body.dark {
    background: #121212;
    color: #e0e0e0;
}

body.dark .navbar {
    background: rgba(30, 30, 30, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

body.dark .navbar .logo {
    color: #80bfff;
}

body.dark .navbar .nav-links li a {
    color: #bbb;
}

body.dark .navbar .nav-links li a:hover {
    color: #80bfff;
}

body.dark .card,
body.dark .brand-intro,
body.dark .article-list article,
body.dark .howto-steps,
body.dark .faq-answer {
    background: rgba(30, 30, 30, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: #ddd;
    border-color: rgba(255, 255, 255, 0.06);
}

body.dark .faq-question {
    background: rgba(42, 42, 42, 0.8);
}

body.dark .breadcrumb {
    background: rgba(26, 26, 26, 0.8);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

body.dark .breadcrumb a {
    color: #80bfff;
}

body.dark .section-title {
    color: #80bfff;
}

body.dark .section-title::after {
    background: linear-gradient(90deg, #80bfff, #c0392b);
}

body.dark .card h3 {
    color: #80bfff;
}

body.dark .card p,
body.dark .article-list article p,
body.dark .faq-answer {
    color: #ccc;
}

body.dark .faq-question .icon {
    color: #80bfff;
}

body.dark .stats .stat h3 {
    color: #80bfff;
}

body.dark .brand-intro .side {
    background: rgba(40, 40, 40, 0.6);
}

body.dark .brand-intro .side h4 {
    color: #80bfff;
}

body.dark .brand-intro .side ul li {
    border-bottom-color: rgba(255, 255, 255, 0.06);
    color: #ccc;
}

body.dark .howto-steps ol li strong {
    color: #80bfff;
}

body.dark .back-top,
body.dark .dark-mode-toggle {
    background: linear-gradient(135deg, #2a2a2a, #3a3a3a);
}

body.dark .back-top:hover,
body.dark .dark-mode-toggle:hover {
    background: linear-gradient(135deg, #c0392b, #e74c3c);
}

body.dark .menu-toggle {
    color: #80bfff;
}

body.dark .search-box input {
    background: rgba(30, 30, 30, 0.8);
    color: #e0e0e0;
    border-color: rgba(255, 255, 255, 0.1);
}

body.dark .search-box input:focus {
    border-color: #80bfff;
}

body.dark .search-box button {
    background: #80bfff;
    color: #121212;
}

/* ===== 滚动动画 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 图片懒加载占位 ===== */
.lazy-placeholder {
    background: rgba(224, 230, 237, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border-radius: 12px;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 0.9rem;
}

/* ===== 页脚 ===== */
footer {
    background: linear-gradient(135deg, #1a3a6b, #0f2a4a);
    color: #fff;
    padding: 40px 0;
    margin-top: 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

footer h4 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    border-bottom: 2px solid rgba(255, 255, 255, 0.15);
    padding-bottom: 8px;
    letter-spacing: 0.5px;
}

footer ul {
    list-style: none;
}

footer ul li {
    margin-bottom: 6px;
}

footer ul li a {
    color: #ccd9f0;
    font-size: 0.9rem;
    transition: color 0.3s, padding-left 0.3s;
}

footer ul li a:hover {
    color: #fff;
    padding-left: 4px;
}

footer .copyright {
    text-align: center;
    padding-top: 25px;
    margin-top: 25px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.85rem;
    color: #b0c4de;
}

/* ===== 搜索框 ===== */
.search-box {
    display: flex;
    gap: 5px;
    margin: 20px 0;
}

.search-box input {
    flex: 1;
    padding: 12px 20px;
    border: 2px solid rgba(0, 0, 0, 0.08);
    border-radius: 30px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.search-box input:focus {
    border-color: #1a3a6b;
    box-shadow: 0 0 0 3px rgba(26, 58, 107, 0.1);
}

.search-box button {
    background: linear-gradient(135deg, #1a3a6b, #2a5a8b);
    color: #fff;
    border: none;
    padding: 12px 24px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
    box-shadow: 0 4px 12px rgba(26, 58, 107, 0.2);
}

.search-box button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(26, 58, 107, 0.3);
    background: linear-gradient(135deg, #c0392b, #e74c3c);
}

/* ===== 客户评价 & 联系我们 卡片通用 ===== */
blockquote {
    max-width: 300px;
    font-style: italic;
    color: #555;
    padding: 16px;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border-radius: 12px;
    border-left: 4px solid #1a3a6b;
    transition: transform 0.3s;
}

blockquote:hover {
    transform: translateY(-3px);
}

/* ===== 友情链接 ===== */
.friend-links a {
    padding: 6px 14px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: background 0.3s, transform 0.3s;
}

.friend-links a:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: translateY(-2px);
}

/* ===== 响应式微调 ===== */
@media (max-width: 768px) {
    .section {
        padding: 40px 0;
    }
    .section-title {
        font-size: 1.6rem;
    }
    .brand-intro {
        padding: 24px;
    }
    .brand-intro .flex {
        gap: 20px;
    }
    .back-top,
    .dark-mode-toggle {
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
        right: 20px;
    }
    .dark-mode-toggle {
        bottom: 80px;
    }
    .back-top {
        bottom: 30px;
    }
    .stats .stat h3 {
        font-size: 2rem;
    }
}

/* ===== 选择文本样式 ===== */
::selection {
    background: #1a3a6b;
    color: #fff;
}

body.dark ::selection {
    background: #80bfff;
    color: #121212;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.04);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #1a3a6b, #c0392b);
    border-radius: 4px;
}

body.dark ::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.04);
}

body.dark ::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #80bfff, #c0392b);
}