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

:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #e8f0fe;
    --secondary: #34a853;
    --accent: #fbbc04;
    --text-dark: #202124;
    --text-medium: #5f6368;
    --text-light: #80868b;
    --bg-white: #ffffff;
    --bg-gray: #f8f9fa;
    --bg-light: #f1f3f4;
    --border: #dadce0;
    --border-light: #e8eaed;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

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

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

ul, ol {
    list-style-position: inside;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.grid-12 {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 24px;
}

.col-1 { grid-column: span 1; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; }
.col-12 { grid-column: span 12; }

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.flex-col {
    display: flex;
    flex-direction: column;
}

.text-center {
    text-align: center;
}

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

.text-secondary {
    color: var(--secondary);
}

.bg-light {
    background-color: var(--bg-light);
}

.bg-gray {
    background-color: var(--bg-gray);
}

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-medium);
    margin-bottom: 48px;
    max-width: 720px;
}

header[role="banner"] {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.logo:hover {
    text-decoration: none;
}

nav[aria-label="主导航"] ul {
    display: flex;
    list-style: none;
    gap: 32px;
}

nav[aria-label="主导航"] a {
    color: var(--text-medium);
    font-size: 15px;
    font-weight: 500;
}

nav[aria-label="主导航"] a:hover {
    color: var(--primary);
    text-decoration: none;
}

nav[aria-label="主导航"] a[aria-current="page"] {
    color: var(--primary);
    font-weight: 600;
}

.breadcrumb {
    background-color: var(--bg-light);
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
}

.breadcrumb ol {
    display: flex;
    list-style: none;
    font-size: 14px;
    color: var(--text-medium);
}

.breadcrumb li {
    display: flex;
    align-items: center;
}

.breadcrumb li + li::before {
    content: "/";
    margin: 0 8px;
    color: var(--text-light);
}

.breadcrumb a {
    color: var(--text-medium);
}

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

.breadcrumb [aria-current="page"] {
    color: var(--text-dark);
    font-weight: 500;
}

.hero {
    background: linear-gradient(135deg, var(--primary-light) 0%, #ffffff 100%);
    padding: 100px 0 80px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.hero p {
    font-size: 18px;
    color: var(--text-medium);
    margin-bottom: 32px;
    max-width: 640px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: white;
}

.btn-secondary {
    background-color: var(--bg-white);
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-secondary:hover {
    background-color: var(--primary-light);
}

.btn-outline {
    background-color: transparent;
    color: var(--text-dark);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background-color: var(--primary-light);
}

.demo-section {
    background-color: var(--bg-white);
}

.demo-cards {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
    margin-top: 48px;
}

.demo-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    transition: all var(--transition);
    position: relative;
}

.demo-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.demo-card .card-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    background-color: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.demo-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.demo-card p {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 1.6;
}

.demo-card .step-number {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 24px;
    background-color: var(--primary);
    color: white;
    border-radius: 50%;
    font-size: 13px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.demo-note {
    text-align: center;
    margin-top: 32px;
    font-size: 15px;
    color: var(--text-medium);
    font-style: italic;
}

.faq-section {
    background-color: var(--bg-gray);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

details {
    background-color: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    transition: all var(--transition);
}

details[open] {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

summary {
    padding: 20px 24px;
    cursor: pointer;
    font-weight: 500;
    font-size: 16px;
    color: var(--text-dark);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color var(--transition);
}

summary:hover {
    background-color: var(--bg-light);
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: "+";
    font-size: 24px;
    color: var(--primary);
    font-weight: 300;
    transition: transform var(--transition);
}

details[open] summary::after {
    content: "−";
}

details .details-content {
    padding: 0 24px 24px;
}

details .details-content ol {
    margin-left: 20px;
    color: var(--text-medium);
    line-height: 1.8;
}

details .details-content li {
    margin-bottom: 8px;
}

.blueprint-preview {
    background-color: var(--bg-white);
}

.blueprint-visual {
    background-color: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 48px;
    margin-bottom: 32px;
}

.blueprint-diagram {
    display: flex;
    justify-content: space-around;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 32px;
}

.blueprint-module {
    flex: 1;
    min-width: 200px;
    text-align: center;
    padding: 24px;
    background-color: var(--bg-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.blueprint-module:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.blueprint-module-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--primary-light), #d2e3fc);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.blueprint-module h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.blueprint-module p {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 1.6;
}

.pricing-section {
    background-color: var(--bg-gray);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.pricing-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    position: relative;
}

.pricing-card.featured::before {
    content: "推荐";
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary);
    color: white;
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.pricing-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.pricing-card .price {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.pricing-card .price span {
    font-size: 16px;
    font-weight: 400;
    color: var(--text-medium);
}

.pricing-card .pricing-desc {
    font-size: 15px;
    color: var(--text-medium);
    margin-bottom: 24px;
    line-height: 1.6;
}

.pricing-card ul {
    list-style: none;
    margin-bottom: 32px;
    flex: 1;
}

.pricing-card li {
    padding: 8px 0;
    font-size: 15px;
    color: var(--text-dark);
    display: flex;
    align-items: center;
}

.pricing-card li::before {
    content: "✓";
    color: var(--secondary);
    font-weight: bold;
    margin-right: 10px;
    font-size: 16px;
}

.pricing-card .btn {
    width: 100%;
}

.pricing-note {
    text-align: center;
    margin-top: 32px;
    font-size: 14px;
    color: var(--text-medium);
}

footer {
    background-color: #202124;
    color: #e8eaed;
    padding: 48px 0 24px;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 32px;
}

.footer-brand h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    color: white;
}

.footer-brand p {
    font-size: 14px;
    color: #9aa0a6;
    line-height: 1.7;
}

.footer-nav h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
    color: white;
}

.footer-nav ul {
    list-style: none;
}

.footer-nav li {
    margin-bottom: 10px;
}

.footer-nav a {
    color: #9aa0a6;
    font-size: 14px;
}

.footer-nav a:hover {
    color: white;
    text-decoration: none;
}

.footer-bottom {
    border-top: 1px solid #3c4043;
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    color: #9aa0a6;
}

.flow-page h1 {
    font-size: 40px;
    margin-bottom: 16px;
}

.flow-intro {
    font-size: 18px;
    color: var(--text-medium);
    margin-bottom: 48px;
    max-width: 720px;
}

.flow-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.flow-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

.flow-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.flow-card-image {
    height: 180px;
    background: linear-gradient(135deg, var(--primary-light), #d2e3fc);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
}

.flow-card-content {
    padding: 24px;
}

.flow-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.flow-card .flow-desc {
    font-size: 15px;
    color: var(--text-medium);
    margin-bottom: 12px;
    line-height: 1.6;
}

.flow-card .flow-features {
    font-size: 14px;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.flow-card .flow-features strong {
    color: var(--secondary);
}

.flow-card .flow-quote {
    font-size: 14px;
    color: var(--text-medium);
    font-style: italic;
    padding: 12px 16px;
    background-color: var(--bg-light);
    border-left: 3px solid var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 16px;
}

.flow-card .flow-link {
    font-size: 14px;
    font-weight: 500;
}

.blueprint-page h1 {
    font-size: 40px;
    margin-bottom: 16px;
}

.blueprint-intro {
    font-size: 18px;
    color: var(--text-medium);
    margin-bottom: 48px;
    max-width: 720px;
}

.blueprint-article {
    background-color: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    margin-bottom: 32px;
}

.blueprint-article h2 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.blueprint-article p {
    font-size: 16px;
    color: var(--text-medium);
    line-height: 1.8;
    margin-bottom: 16px;
}

.article-images {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.article-image {
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    border: 1px solid var(--border-light);
}

.article-image-caption {
    font-size: 13px;
    color: var(--text-light);
    text-align: center;
    margin-top: 8px;
}

.blueprint-anecdote {
    background: linear-gradient(135deg, var(--primary-light), #fce8e6);
    border-radius: var(--radius-md);
    padding: 24px;
    margin: 24px 0;
    border-left: 4px solid var(--primary);
}

.blueprint-anecdote p {
    font-size: 15px;
    color: var(--text-dark);
    font-style: italic;
    margin: 0;
    line-height: 1.8;
}

.contact-page h1 {
    font-size: 40px;
    margin-bottom: 16px;
}

.contact-intro {
    font-size: 18px;
    color: var(--text-medium);
    margin-bottom: 48px;
    max-width: 720px;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 48px;
}

.contact-form {
    background-color: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    font-size: 15px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-dark);
    transition: border-color var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-info-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.contact-info-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.contact-info-card p {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 1.6;
    margin-bottom: 8px;
}

.contact-info-card .contact-icon {
    font-size: 24px;
    margin-bottom: 12px;
}

@media (max-width: 1024px) {
    .demo-cards {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .pricing-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }
    
    .blueprint-diagram {
        flex-direction: column;
        align-items: stretch;
    }
    
    .blueprint-module {
        min-width: auto;
    }
}

@media (max-width: 800px) {
    .section {
        padding: 60px 0;
    }
    
    .hero {
        padding: 60px 0 50px;
    }
    
    .hero h1 {
        font-size: 36px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .demo-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-cards {
        grid-template-columns: 1fr;
    }
    
    .flow-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .article-images {
        grid-template-columns: 1fr;
    }
    
    nav[aria-label="主导航"] ul {
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .grid-12 {
        grid-template-columns: repeat(6, 1fr);
    }
    
    .col-1, .col-2, .col-3, .col-4, .col-5, .col-6,
    .col-7, .col-8, .col-9, .col-10, .col-11, .col-12 {
        grid-column: span 6;
    }
    
    .header-inner {
        flex-direction: column;
        gap: 12px;
        padding: 12px 0;
    }
    
    nav[aria-label="主导航"] ul {
        gap: 16px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .demo-cards {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-buttons .btn {
        width: 100%;
    }
    
    .footer-inner {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .blueprint-article {
        padding: 24px;
    }
    
    .blueprint-article h2 {
        font-size: 22px;
    }
    
    .blueprint-visual {
        padding: 24px;
    }
    
    .pricing-card {
        padding: 24px;
    }
    
    .flow-page h1,
    .blueprint-page h1,
    .contact-page h1 {
        font-size: 30px;
    }
}