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

:root {
    --primary-black: #0a0a0a;
    --secondary-black: #1a1a1a;
    --accent-black: #2a2a2a;
    --text-white: #ffffff;
    --text-gray: #CBCBCB;
    --text-medium-gray: #979797;
    --text-light-gray: #808080;
    --accent-orange: #E45801;
    --accent-orange-light: rgba(228, 88, 1, 0.1);
    --accent-orange-border: rgba(228, 88, 1, 0.3);
    --gradient-main: linear-gradient(135deg, #CBCBCB 0%, #979797 50%, #E45801 100%);
    --gradient-orange: linear-gradient(135deg, #E45801 0%, #ff7a2e 100%);
    --shadow-glow: 0 0 30px rgba(228, 88, 1, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
}

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
}

.app-icon-nav {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

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

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

.download-btn-nav {
    background: var(--gradient-orange);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.download-btn-nav:hover {
    color: var(--text-white) !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 70%, rgba(228, 88, 1, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 70% 30%, rgba(203, 203, 203, 0.03) 0%, transparent 50%),
                var(--primary-black);
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.5;
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
}

.floating-element {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--text-medium-gray);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
    box-shadow: 0 0 10px var(--text-medium-gray);
    opacity: 0.6;
}

.floating-element:nth-child(1) {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.floating-element:nth-child(2) {
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.floating-element:nth-child(3) {
    bottom: 30%;
    left: 80%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) scale(1); opacity: 0.7; }
    50% { transform: translateY(-20px) scale(1.2); opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 100px 20px 50px;
}

.app-showcase {
    position: relative;
    margin-bottom: 40px;
}

.app-icon-hero {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    box-shadow: var(--shadow-card);
    transition: transform 0.3s ease;
}

.app-icon-hero:hover {
    transform: scale(1.05);
}

.app-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: var(--gradient-orange);
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.2;
    z-index: -1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero-slogan {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-gray);
}

.hero-slogan-en {
    font-size: 1.1rem;
    color: var(--text-medium-gray);
    margin-bottom: 24px;
    font-style: italic;
    font-weight: 400;
}

.gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-gray);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    background: var(--gradient-orange);
    color: var(--text-white);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.download-btn.large {
    padding: 20px 40px;
    font-size: 18px;
}

.learn-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    background: transparent;
    color: var(--text-white);
    text-decoration: none;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.learn-more-btn:hover {
    border-color: var(--accent-orange);
    color: var(--accent-orange);
    transform: translateY(-3px);
}

/* Screenshots Section */
.screenshots-section {
    padding: 100px 0;
    background: var(--secondary-black);
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-medium-gray);
    margin-bottom: 60px;
    margin-top: -20px;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

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

.phone-frame {
    position: relative;
    width: auto;
    height: auto;
    background: transparent;
    border-radius: 0;
    border: none;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: none;
    overflow: visible;
}

.screenshot-img {
    width: auto;
    height: 400px;
    max-width: 200px;
    border-radius: 0;
    object-fit: contain;
    display: block;
}

.screenshot-placeholder {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-medium-gray);
    padding: 20px;
}

.screenshot-placeholder i {
    font-size: 2.5rem;
    color: var(--text-medium-gray);
    margin-bottom: 16px;
}

.screenshot-placeholder p {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-gray);
}

.screenshot-placeholder small {
    font-size: 0.8rem;
    color: var(--text-medium-gray);
}

.screenshot-item h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-white);
}

.screenshot-item p {
    font-size: 0.95rem;
    color: var(--text-medium-gray);
}

/* Sections */
.features, .use-cases, .download-section {
    padding: 100px 0;
    position: relative;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
}

/* Features */
.features {
    background: var(--primary-black);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    background: var(--accent-black);
    padding: 40px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-main);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-card);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-black);
    border: 2px solid var(--text-medium-gray);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 24px;
    color: var(--text-gray);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 20px;
}

.feature-highlight {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(203, 203, 203, 0.1);
    padding: 12px 20px;
    border-radius: 50px;
    border: 1px solid rgba(203, 203, 203, 0.3);
    width: fit-content;
}

.feature-highlight span {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-gray);
}

.feature-highlight small {
    color: var(--text-medium-gray);
    font-size: 0.9rem;
}

/* Use Cases */
.use-cases {
    background: var(--secondary-black);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.use-case-card {
    background: var(--accent-black);
    padding: 30px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.use-case-card:hover {
    transform: translateY(-5px);
    border-color: var(--text-gray);
}

.use-case-icon {
    width: 50px;
    height: 50px;
    background: var(--accent-black);
    border: 2px solid var(--text-medium-gray);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 20px;
    color: var(--text-gray);
}

.use-case-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.use-case-card p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* Download Section */
.download-section {
    background: var(--primary-black);
}

.download-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.download-content {
    text-align: left;
}

.download-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.download-subtitle {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 40px;
}

.download-note {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
    color: var(--text-medium-gray);
    font-size: 0.9rem;
}

.download-visual {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 200px;
    height: 400px;
    background: var(--accent-black);
    border-radius: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-card);
}

.phone-screen {
    width: 180px;
    height: 360px;
    background: var(--primary-black);
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-icon-download {
    width: 80px;
    height: 80px;
    border-radius: 18px;
}

/* Footer */
.footer {
    background: var(--primary-black);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 40px 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 600;
}

.app-icon-footer {
    width: 28px;
    height: 28px;
    border-radius: 6px;
}

.footer p {
    color: var(--text-medium-gray);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-slogan {
        font-size: 1.5rem;
    }
    
    .hero-slogan-en {
        font-size: 1rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    /* 移动端导航栏优化 - 隐藏导航链接，只保留语言切换 */
    .nav-links > a {
        display: none;
    }
    
    .nav-links {
        gap: 0;
        justify-content: flex-end;
    }
    
    .language-selector {
        margin-left: 0;
    }
    
    .language-select {
        padding: 6px 10px;
        font-size: 13px;
    }
    
    .screenshots-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .use-cases-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    .download-section .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .download-content {
        text-align: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-slogan {
        font-size: 1.3rem;
    }
    
    .hero-content {
        padding: 80px 15px 30px;
    }
    
    .app-icon-hero {
        width: 100px;
        height: 100px;
    }
    
    .feature-card, .use-case-card {
        padding: 25px;
    }
    
    .phone-mockup {
        width: 160px;
        height: 320px;
    }
    
    .phone-screen {
        width: 140px;
        height: 280px;
    }
    
    .app-icon-download {
        width: 60px;
        height: 60px;
    }
    
    .screenshots-grid {
        gap: 30px;
    }
    
    .screenshot-img {
        height: 300px;
        max-width: 150px;
    }
    
    /* 超小屏幕设备进一步优化导航栏 */
    .nav-container {
        padding: 12px 15px;
    }
    
    .nav-logo {
        font-size: 18px;
    }
    
    .app-icon-nav {
        width: 28px;
        height: 28px;
    }
    
    .language-select {
        padding: 5px 8px;
        font-size: 12px;
    }
}

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

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

::-webkit-scrollbar-track {
    background: var(--primary-black);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-orange);
}

/* Language Selector */
.language-selector {
    margin-left: 20px;
}

.language-select {
    background: var(--accent-black);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: var(--text-white);
    padding: 6px 12px;
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-select:hover {
    border-color: var(--text-gray);
}

.language-select:focus {
    outline: none;
    border-color: var(--accent-orange);
}

.language-select option {
    background: var(--accent-black);
    color: var(--text-white);
}