/* Telegram 中文版网站样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0088cc;
    --primary-dark: #0066aa;
    --secondary-color: #666;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --success: #2ed573;
    --warning: #ffa502;
    --danger: #ff4757;
    --border-color: #e9ecef;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 25px rgba(0, 136, 204, 0.15);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
    overflow-x: hidden;
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand .logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    min-height: 100vh;
    padding: 8rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
    gap: 4rem;
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--secondary-color);
    margin-bottom: 2rem;
    line-height: 1.7;
}

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

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

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

.hero-stats {
    display: flex;
    gap: 3rem;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

/* Hero Image - Phone Mockup */
.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    width: 320px;
    height: 640px;
    background: linear-gradient(145deg, #f0f0f0, #ffffff);
    border-radius: 35px;
    padding: 25px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.15);
    position: relative;
    transform: rotate(-5deg);
    transition: transform 0.3s ease;
}

.phone-mockup:hover {
    transform: rotate(0deg) scale(1.02);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: #000;
    border-radius: 25px;
    overflow: hidden;
    position: relative;
}

.chat-interface {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.chat-header {
    background: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.telegram-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.telegram-avatar::before {
    content: 'T';
    font-size: 1.2rem;
}

.chat-info {
    flex: 1;
    color: white;
}

.chat-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.chat-status {
    font-size: 0.8rem;
    opacity: 0.8;
}

.chat-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.3s ease;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    justify-content: flex-end;
    overflow-y: auto;
}

.message {
    display: flex;
    animation: messageSlide 0.5s ease-out;
}

.message.received {
    justify-content: flex-start;
}

.message.sent {
    justify-content: flex-end;
}

.message-bubble {
    max-width: 75%;
    padding: 0.75rem 1rem;
    border-radius: 18px;
    font-size: 0.9rem;
    position: relative;
}

.message.received .message-bubble {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border-bottom-left-radius: 6px;
}

.message.sent .message-bubble {
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-color);
    border-bottom-right-radius: 6px;
}

.message-text {
    margin-bottom: 0.25rem;
}

.message-time {
    font-size: 0.75rem;
    opacity: 0.7;
    text-align: right;
}

.chat-input {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.input-area {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.input-placeholder {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.input-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.input-emoji, .input-send {
    cursor: pointer;
    font-size: 1.1rem;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.input-emoji:hover, .input-send:hover {
    opacity: 1;
}

@keyframes messageSlide {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Features Section */
.features {
    padding: 6rem 0;
    background: var(--light-bg);
}

.features h2 {
    text-align: center;
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 4rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.feature-icon {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--secondary-color);
    line-height: 1.7;
    font-size: 1rem;
}
/* Security Section */
.security {
    padding: 6rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.security-content {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.security-text {
    flex: 1;
}

.security h2 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.security .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 3rem;
}

.security-features {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.security-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.security-icon {
    font-size: 2rem;
    min-width: 60px;
    text-align: center;
}

.security-info h4 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.security-info p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.security-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.security-shield {
    position: relative;
}

.security-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: float 3s ease-in-out infinite;
}

.particle:nth-child(1) { top: 20%; left: 10%; animation-delay: 0s; }
.particle:nth-child(2) { top: 40%; right: 15%; animation-delay: 0.5s; }
.particle:nth-child(3) { bottom: 30%; left: 20%; animation-delay: 1s; }
.particle:nth-child(4) { bottom: 20%; right: 10%; animation-delay: 1.5s; }
.particle:nth-child(5) { top: 60%; left: 50%; animation-delay: 2s; }

@keyframes float {
    0%, 100% { transform: translateY(0px) scale(1); opacity: 0.6; }
    50% { transform: translateY(-20px) scale(1.2); opacity: 1; }
}

/* Download Section */
.download {
    padding: 6rem 0;
    background: var(--white);
}

.download h2 {
    text-align: center;
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
    margin-bottom: 4rem;
}

.download-category h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 16px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.download-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.download-btn.mobile:hover {
    background: linear-gradient(135deg, #007AFF, #34A853);
    color: white;
}

.download-btn.desktop:hover {
    background: linear-gradient(135deg, #0078D4, #000);
    color: white;
}

.download-btn.web:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.download-icon {
    min-width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-info {
    flex: 1;
}

.download-platform {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.download-store {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.download-size {
    color: var(--secondary-color);
    font-size: 0.8rem;
}

.download-arrow {
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.download-btn:hover .download-arrow {
    transform: translateX(5px);
}

.download-qr {
    text-align: center;
    margin-top: 3rem;
}

.qr-code {
    display: inline-block;
    padding: 1rem;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
}

.download-qr p {
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* Testimonials Section */
.testimonials {
    padding: 6rem 0;
    background: var(--light-bg);
}

.testimonials h2 {
    text-align: center;
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 4rem;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-5px);
}

.testimonial-content {
    margin-bottom: 1.5rem;
}

.stars {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.testimonial-content p {
    color: var(--secondary-color);
    line-height: 1.7;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--light-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.author-name {
    font-weight: 600;
    color: var(--text-color);
}

.author-title {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

/* Help Section */
.help {
    padding: 6rem 0;
    background: var(--white);
}

.help h2 {
    text-align: center;
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 4rem;
}

.help-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.help-category {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 16px;
    transition: transform 0.3s ease;
}

.help-category:hover {
    transform: translateY(-3px);
}

.help-category h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1.5rem;
}

.help-category ul {
    list-style: none;
}

.help-category li {
    margin-bottom: 0.75rem;
}

.help-category a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.3s ease;
    display: block;
    padding: 0.5rem 0;
    border-bottom: 1px solid transparent;
}

.help-category a:hover {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-brand .logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.footer-brand p {
    color: #ccc;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.social-link {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

.social-link:hover {
    color: var(--primary-color);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.footer-column a {
    display: block;
    color: #ccc;
    text-decoration: none;
    margin-bottom: 0.75rem;
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

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

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom p {
    color: #999;
    font-size: 0.9rem;
}

.footer-badges {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.badge {
    background: rgba(0, 136, 204, 0.1);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    border: 1px solid rgba(0, 136, 204, 0.2);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 6rem 1rem 3rem;
        gap: 2rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-stats {
        justify-content: center;
        gap: 2rem;
    }
    
    .nav {
        padding: 1rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .feature-card {
        padding: 2rem;
    }
    
    .security-content {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }
    
    .security h2 {
        font-size: 2rem;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .download h2 {
        font-size: 2rem;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .help-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .phone-mockup {
        width: 280px;
        height: 560px;
        transform: none;
    }
    
    .phone-mockup:hover {
        transform: scale(1.02);
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .features h2,
    .security h2,
    .download h2,
    .testimonials h2,
    .help h2 {
        font-size: 1.8rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .download-btn {
        padding: 1rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .hero-stats {
        gap: 1.5rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
}

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

.feature-card,
.testimonial-card,
.help-category {
    animation: fadeInUp 0.6s ease-out;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading animation */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}