/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.3;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }

p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

a {
    color: #007AFF;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #0056CC;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 12px 24px;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #007AFF, #5856D6);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 122, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 122, 255, 0.4);
    color: white;
}

.btn-secondary {
    background: rgba(0, 122, 255, 0.1);
    color: #007AFF;
    border: 2px solid rgba(0, 122, 255, 0.2);
}

.btn-outline {
    background: transparent;
    color: #007AFF;
    border: 2px solid #007AFF;
}

.btn-outline:hover {
    background: #007AFF;
    color: white;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.5rem;
    color: #007AFF;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #007AFF;
}

.download-btn {
    background: #007AFF;
    color: white !important;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f8f9ff 0%, #e8f2ff 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding-left: 2rem;
}

.hero-content {
    padding-left: 1rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: #1a1a1a;
}

.gradient-text {
    background: linear-gradient(135deg, #007AFF, #5856D6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #007AFF;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
}

.phone-mockup {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
}

.app-screenshot {
    width: 100%;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

/* Page Hero */
.page-hero {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, #f8f9ff 0%, #e8f2ff 100%);
    text-align: center;
}

.page-hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #1a1a1a;
}

.page-hero-content p {
    font-size: 1.2rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* Sections */
.features-preview,
.core-features,
.help-section,
.contact-section,
.privacy-content {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    padding: 0 2rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1a1a1a;
}

.section-header p {
    font-size: 1.1rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

/* Features Grid */
.features-grid,
.guides-grid,
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card,
.guide-category,
.tech-card {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover,
.tech-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.feature-icon,
.guide-icon,
.tech-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #007AFF, #5856D6);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon i,
.guide-icon i,
.tech-icon i {
    font-size: 1.5rem;
    color: white;
}

/* Contact Form */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-form {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #333;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #007AFF;
}

/* Privacy Policy */
.policy-document {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 3rem;
    align-items: start;
}

.policy-toc {
    position: sticky;
    top: 120px;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.policy-toc ul {
    list-style: none;
}

.policy-toc li {
    margin-bottom: 0.5rem;
}

.policy-section {
    margin-bottom: 3rem;
}

.policy-highlight {
    background: #f8f9ff;
    border-left: 4px solid #007AFF;
    padding: 1rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 8rem 0 2rem; margin-top: 6rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.footer-logo-img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

.footer-logo-text {
    font-size: 1.2rem;
    font-weight: 700;
    color: #007AFF;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #ccc;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
}

.social-link:hover {
    background: #007AFF;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 2rem;
    text-align: center;
    color: #666;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        padding-left: 0;
    }
    
    .hero-content {
        padding-left: 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-header {
        padding: 0 1rem;
    }
    
    .why-content,
    .mission-content {
        padding: 0 1rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .policy-document {
        grid-template-columns: 1fr;
    }
    
    .policy-toc {
        position: static;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
}

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

.feature-card,
.guide-category,
.tech-card {
    animation: fadeInUp 0.6s ease forwards;
}

/* Utility Classes */
.text-center { text-align: center; }
.mb-2 { margin-bottom: 2rem; }
.mt-2 { margin-top: 2rem; }

/* Additional specific styles for complex sections */
.why-choose,
.mission-section,
.story-section {
    padding: 80px 0;
    background: #f8f9ff;
}

.why-content,
.mission-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding: 0 2rem;
}

.timeline-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.timeline-icon {
    width: 50px;
    height: 50px;
    background: #007AFF;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.faq-accordion .faq-item {
    background: white;
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    transition: background 0.3s ease;
}

.faq-question:hover {
    background: #f8f9ff;
}

.faq-answer {
    padding: 0 1.5rem 1.5rem;
    color: #666;
}

.search-box {
    display: flex;
    max-width: 500px;
    margin: 2rem auto 0;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.search-box input {
    flex: 1;
    padding: 1rem;
    border: none;
    font-size: 1rem;
}

.search-box button {
    padding: 1rem;
    background: #007AFF;
    border: none;
    color: white;
    cursor: pointer;
} 

/* 图片尺寸控制 */
.feature-image img { max-width: 300px; width: 100%; height: auto; border-radius: 12px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); }
.mission-image img, .vision-image img { max-width: 280px; width: 100%; height: auto; border-radius: 12px; box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1); }
.why-image img { max-width: 350px; width: 100%; height: auto; border-radius: 12px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); }
.member-photo img { width: 100px; height: 100px; border-radius: 50%; object-fit: cover; box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1); }
.phone-mockup { position: relative; max-width: 220px; margin: 0 auto; }
/* 移动端图片调整 */
@media (max-width: 768px) {
  .feature-image img { max-width: 250px; }
  .mission-image img, .vision-image img { max-width: 220px; }
  .why-image img { max-width: 280px; }
  .member-photo img { width: 80px; height: 80px; }
  .phone-mockup { max-width: 180px; }
}