/* style.css - Dark Tech SaaS Theme */
:root {
    --primary-color: #00e5ff; /* 霓虹青色 */
    --primary-hover: #00b8cc;
    --bg-color: #0d1117; /* 深黑背景 */
    --surface-color: #161b22; /* 卡片背景 */
    --text-main: #c9d1d9;
    --text-muted: #8b949e;
    --border-color: #30363d;
    --white: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-color);
    background-image: 
        linear-gradient(rgba(13, 17, 23, 0.9), rgba(13, 17, 23, 0.9)),
        url('data:image/svg+xml;utf8,<svg width="40" height="40" xmlns="http://www.w3.org/2000/svg"><path d="M0 0h40v40H0z" fill="none"/><path d="M40 10L0 10M40 20L0 20M40 30L0 30M10 40L10 0M20 40L20 0M30 40L30 0" stroke="rgba(255,255,255,0.03)" stroke-width="1"/></svg>');
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

a:hover {
    text-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
}

/* 导航栏 - 暗黑发光椭圆 */
header {
    position: fixed;
    top: 25px;
    width: 100%;
    z-index: 1000;
    padding: 0 1rem;
}

.nav-container {
    max-width: 850px;
    margin: 0 auto;
    padding: 0.8rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(22, 27, 34, 0.7);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: 50px;
    border: 1px solid var(--border-color);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--white);
    letter-spacing: 1px;
    text-transform: uppercase;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2.5rem;
}

nav a {
    color: var(--text-main);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

/* 主视觉区 */
.hero {
    display: flex;
    max-width: 1200px;
    margin: 10rem auto 6rem;
    padding: 0 2rem;
    align-items: center;
    gap: 4rem;
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--white);
    font-weight: 800;
}
.hero h1 span {
    color: var(--primary-color);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 90%;
}

.cta-button {
    display: inline-block;
    background: transparent;
    color: var(--primary-color) !important;
    padding: 1rem 3rem;
    border-radius: 4px;
    font-size: 1.1rem;
    font-weight: 600;
    border: 1px solid var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.cta-button:hover {
    background: var(--primary-color);
    color: var(--bg-color) !important;
    box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.dynamic-placeholder {
    width: 100%;
    max-width: 400px;
    height: 400px;
    background: radial-gradient(circle at center, var(--surface-color) 0%, transparent 70%);
    border: 1px dashed var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    border-radius: 50%;
    position: relative;
    animation: pulse 4s infinite alternate;
}
.dynamic-placeholder::before {
    content: '';
    position: absolute;
    width: 120%;
    height: 120%;
    border: 1px solid rgba(0, 229, 255, 0.2);
    border-radius: 50%;
    animation: spin 10s linear infinite;
}
.dynamic-placeholder::after {
    content: '';
    position: absolute;
    width: 140%;
    height: 140%;
    border: 1px dashed rgba(0, 229, 255, 0.1);
    border-radius: 50%;
    animation: spin-reverse 15s linear infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 rgba(0, 229, 255, 0); }
    100% { transform: scale(1); box-shadow: 0 0 40px rgba(0, 229, 255, 0.1); }
}
@keyframes spin { 100% { transform: rotate(360deg); } }
@keyframes spin-reverse { 100% { transform: rotate(-360deg); } }


/* 通用区段 */
section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

section h2 {
    font-size: 2.5rem;
    color: var(--white);
    margin-bottom: 3.5rem;
    position: relative;
    display: inline-block;
}
section h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--primary-color);
}

/* 核心优势 & AI卡片 */
.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--surface-color);
    padding: 3rem 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.card h3 {
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: 1rem;
}

/* 价格对比表 */
.pricing-table {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    align-items: center;
}

.price-card {
    background: var(--surface-color);
    padding: 3rem 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.price-card.popular {
    background: linear-gradient(180deg, var(--surface-color) 0%, rgba(0, 229, 255, 0.05) 100%);
    border: 1px solid var(--primary-color);
    transform: scale(1.05);
    position: relative;
}
.price-card.popular::before {
    content: '最受欢迎';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: var(--bg-color);
    padding: 2px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}

.price-card h3 {
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: 1rem;
}

.price {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--white);
    margin-bottom: 2rem;
}

.price span {
    font-size: 1rem;
    color: var(--text-muted);
}

.price-card ul {
    list-style: none;
    margin-bottom: 2.5rem;
    text-align: left;
}

.price-card li {
    margin-bottom: 1rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
}
.price-card li::before {
    content: '▶';
    color: var(--primary-color);
    font-size: 0.8rem;
    margin-right: 12px;
}

/* SEO 文章 - 紧凑列表样式 */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.article-card {
    background: transparent;
    padding: 1.5rem;
    border-left: 2px solid var(--border-color);
    transition: all 0.3s;
}

.article-card:hover {
    border-left-color: var(--primary-color);
    background: rgba(255,255,255,0.02);
}

.article-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.article-card h3 a {
    color: var(--white);
}

.article-card h3 a:hover {
    color: var(--primary-color);
}

.article-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* FAQ 区域 */
.faq-item {
    background: var(--surface-color);
    padding: 1.5rem 2rem;
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
}
.faq-item h3 {
    color: var(--white);
}

/* 评价区域 */
.review-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}
.review {
    background: var(--surface-color);
    padding: 2rem;
    font-style: italic;
    border: 1px solid var(--border-color);
    position: relative;
}
.review::before {
    content: '"';
    font-size: 4rem;
    position: absolute;
    top: -10px;
    left: 10px;
    color: rgba(255,255,255,0.05);
}
.review span {
    display: block;
    margin-top: 1rem;
    color: var(--primary-color);
    font-weight: bold;
    font-style: normal;
}


/* 页脚 */
footer {
    background: #000;
    text-align: center;
    padding: 4rem 1rem;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
}

.footer-links a {
    color: var(--text-muted);
    margin: 0 1rem;
    font-size: 0.9rem;
    text-transform: uppercase;
}

.pbn-links {
    margin: 2rem 0;
    font-size: 0.85rem;
}

.pbn-links a {
    color: #555;
    margin: 0 0.5rem;
}
.pbn-links a:hover {
    color: var(--primary-color);
}

/* 移动端适配 */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        margin-top: 8rem;
    }
    .nav-container {
        padding: 0.8rem 1.5rem;
    }
    nav ul {
        display: none;
    }
    .price-card.popular {
        transform: none;
    }
}