/* 全局重置与基础样式 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg-dark: #0f0f1a;
    --color-bg-card: rgba(26, 26, 46, 0.85);
    --color-bg-glass: rgba(255, 255, 255, 0.06);
    --color-primary: #e94560;
    --color-primary-hover: #ff5a7a;
    --color-accent: #0f3460;
    --color-text: #e0e0e0;
    --color-text-light: #a0a0b0;
    --color-heading: #ffffff;
    --color-border: rgba(233, 69, 96, 0.3);
    --color-glow: rgba(233, 69, 96, 0.4);
    --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px var(--color-glow);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg-dark);
    color: var(--color-text);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
    background-image: 
        radial-gradient(ellipse at 10% 20%, rgba(233, 69, 96, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 90% 80%, rgba(15, 52, 96, 0.12) 0%, transparent 60%),
        radial-gradient(ellipse at 50% 50%, rgba(26, 26, 46, 0.5) 0%, transparent 80%);
    background-attachment: fixed;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

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

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

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

::-webkit-scrollbar-track {
    background: var(--color-bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-hover);
}

/* 滚动动画基类 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* 标题样式 */
h1, h2, h3, h4 {
    color: var(--color-heading);
    font-weight: 700;
    line-height: 1.3;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.4rem); margin-bottom: 1.5rem; }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); margin-bottom: 0.8rem; }

section {
    padding: 4rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* 导航栏 */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 15, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.8rem 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--color-heading);
    font-size: 1.3rem;
    font-weight: 700;
    transition: transform var(--transition);
}

.logo:hover {
    transform: scale(1.05);
    color: var(--color-heading);
}

.logo svg {
    width: 36px;
    height: 36px;
    filter: drop-shadow(0 0 6px var(--color-glow));
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.2rem;
}

.nav-links a {
    color: var(--color-text-light);
    padding: 0.5rem 0.9rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
    transition: transform var(--transition);
}

.nav-links a:hover {
    color: var(--color-heading);
    background: var(--color-bg-glass);
}

.nav-links a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--color-heading);
    cursor: pointer;
    padding: 0.3rem;
    transition: transform var(--transition);
}

.nav-toggle:hover {
    transform: rotate(90deg);
}

/* 移动端导航 */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(15, 15, 26, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1rem;
        gap: 0.3rem;
        transform: translateY(-120%);
        opacity: 0;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        border-bottom: 1px solid var(--color-border);
        pointer-events: none;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-links a {
        padding: 0.8rem 1rem;
        font-size: 1rem;
        border-radius: var(--radius-sm);
    }

    .nav-toggle {
        display: block;
    }
}

/* Hero 区域 - 渐变Banner */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 1.5rem 4rem;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 40%, #0f3460 70%, #1a1a2e 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

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

#hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(233, 69, 96, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 30%, rgba(15, 52, 96, 0.15) 0%, transparent 50%);
    animation: heroPulse 8s ease-in-out infinite;
    pointer-events: none;
}

@keyframes heroPulse {
    0%, 100% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.1); opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-content h1 {
    margin-bottom: 1.2rem;
    text-shadow: 0 0 30px rgba(233, 69, 96, 0.3);
    animation: fadeInUp 0.8s ease-out;
}

.hero-content p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--color-text-light);
    margin-bottom: 1rem;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.btn {
    display: inline-block;
    padding: 0.9rem 2.2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    color: #fff;
    box-shadow: 0 4px 20px var(--color-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px var(--color-glow);
    color: #fff;
}

.btn-secondary {
    background: transparent;
    color: var(--color-heading);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-glass);
    border-color: var(--color-primary);
    transform: translateY(-3px);
    color: var(--color-heading);
}

/* 卡片通用样式 - 圆角卡片 + 毛玻璃 */
section:not(#hero) {
    animation: fadeInUp 0.6s ease-out;
}

.about-grid, .products-list, .solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

article, .company-details, .faq-list details, blockquote {
    background: var(--color-bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-md);
    padding: 1.8rem;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
    box-shadow: var(--shadow-card);
}

article:hover {
    transform: translateY(-6px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-card), var(--shadow-glow);
}

article h3 {
    color: var(--color-primary);
    margin-bottom: 0.8rem;
}

article p {
    color: var(--color-text-light);
}

/* 列表样式 */
ul, ol {
    padding-left: 1.5rem;
    color: var(--color-text-light);
}

li {
    margin-bottom: 0.5rem;
}

/* FAQ 区域 */
.faq-list details {
    margin-bottom: 1rem;
    cursor: pointer;
    padding: 1.2rem 1.8rem;
    transition: all var(--transition);
}

.faq-list details:hover {
    border-color: var(--color-primary);
    background: rgba(233, 69, 96, 0.05);
}

.faq-list summary {
    font-weight: 600;
    color: var(--color-heading);
    font-size: 1.05rem;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.faq-list summary::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--color-primary);
    transition: transform var(--transition);
}

.faq-list details[open] summary::after {
    transform: rotate(45deg);
}

.faq-list details p {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
}

/* 知识中心文章列表 */
.article-list {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0.8rem;
    margin-bottom: 2rem;
}

.article-list li a {
    display: block;
    padding: 0.8rem 1.2rem;
    background: var(--color-bg-glass);
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    transition: all var(--transition);
    color: var(--color-text);
    font-weight: 500;
}

.article-list li a:hover {
    background: var(--color-bg-card);
    border-color: var(--color-primary);
    transform: translateX(4px);
    color: var(--color-primary);
}

#knowledge article {
    margin-bottom: 1.5rem;
}

#knowledge article h3 {
    color: var(--color-heading);
    margin-bottom: 0.6rem;
}

/* 用户反馈 */
blockquote {
    font-style: italic;
    border-left: 4px solid var(--color-primary);
    margin-bottom: 1rem;
    position: relative;
}

blockquote p {
    color: var(--color-text);
}

blockquote::before {
    content: '"';
    font-size: 3rem;
    color: var(--color-primary);
    opacity: 0.3;
    position: absolute;
    top: 0.2rem;
    left: 0.8rem;
    line-height: 1;
}

/* 企业信息 */
.company-details p {
    margin-bottom: 0.6rem;
    color: var(--color-text-light);
}

.company-details strong {
    color: var(--color-heading);
}

/* 核心服务、特性、收益、使用流程等 */
#services ul, #features ul, #benefits ul, #howto ol, #workflow ol {
    background: var(--color-bg-card);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-md);
    padding: 1.8rem 2rem;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
}

#services li, #features li, #benefits li {
    padding: 0.4rem 0;
}

/* 使用流程 */
#workflow ol, #howto ol {
    counter-reset: step;
    list-style: none;
    padding-left: 0;
}

#workflow ol li, #howto ol li {
    counter-increment: step;
    padding: 0.6rem 0 0.6rem 2.8rem;
    position: relative;
    color: var(--color-text-light);
}

#workflow ol li::before, #howto ol li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0.4rem;
    width: 2rem;
    height: 2rem;
    background: var(--color-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
}

/* 联系区域 */
#contact ul {
    list-style: none;
    padding: 0;
}

#contact ul li {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--color-border);
}

#contact ul li:last-child {
    border-bottom: none;
}

/* 底部 */
footer {
    background: rgba(15, 15, 26, 0.95);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--color-border);
    padding: 3rem 1.5rem 2rem;
    margin-top: 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-info {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem 1.5rem;
    margin-bottom: 1.5rem;
}

.footer-links a {
    color: var(--color-text-light);
    font-size: 0.9rem;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-legal {
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-text-light);
    line-height: 1.8;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

.footer-legal strong {
    color: var(--color-text);
}

/* 更新信息标签 */
.update-info {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: 2rem;
    padding: 0.5rem 1rem;
    background: var(--color-bg-glass);
    border-radius: var(--radius-sm);
    display: inline-block;
    width: auto;
    margin-left: auto;
    margin-right: auto;
}

/* 响应式调整 */
@media (max-width: 768px) {
    section {
        padding: 3rem 1rem;
    }

    .about-grid, .products-list, .solutions-grid {
        grid-template-columns: 1fr;
    }

    article {
        padding: 1.4rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }

    .article-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .nav-container {
        padding: 0.6rem 1rem;
    }

    #hero {
        padding: 5rem 1rem 3rem;
    }

    .faq-list details {
        padding: 1rem;
    }
}

/* 暗色模式支持（默认已是暗色，这里做增强） */
@media (prefers-color-scheme: light) {
    :root {
        --color-bg-dark: #0f0f1a;
        --color-text: #e0e0e0;
        --color-text-light: #a0a0b0;
        --color-heading: #ffffff;
    }
    /* 保持暗色风格，不跟随系统 */
}

/* 动画辅助类 */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.float-anim {
    animation: float 4s ease-in-out infinite;
}

/* 选中高亮 */
::selection {
    background: var(--color-primary);
    color: #fff;
}

/* 焦点样式 */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* 兼容旧浏览器 */
@supports not (backdrop-filter: blur(12px)) {
    article, .faq-list details, .company-details, blockquote,
    #services ul, #features ul, #benefits ul, #howto ol, #workflow ol {
        background: var(--color-bg-card);
    }
}