/* 基础重置与变量 - Emerald Green & Dark Stealth 主题 */
:root {
    --primary: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --primary-glow: rgba(16, 185, 129, 0.4);
    --text-main: #f3f4f6;
    --text-light: #9ca3af;
    --bg-main: #111827;
    --bg-light: #1f2937;
    --bg-dark: #0b0f19;
    --border: #374151;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --button-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.39);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-main);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

.section-title {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--text-main);
    letter-spacing: 0.5px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 3rem;
}

/* 动画特效 (Fade In/Out) */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 导航栏 - 清晰边界与模糊背景 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(17, 24, 39, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid var(--primary);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    transition: all 0.3s ease;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-main);
}

.logo img {
    height: 32px;
    width: 32px;
}

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

.nav-links a {
    font-weight: 500;
    color: var(--text-light);
    transition: color 0.3s, text-shadow 0.3s;
}

.nav-links a:hover {
    color: var(--primary-light);
    text-shadow: 0 0 8px var(--primary-glow);
}

.nav-buttons {
    display: flex;
    gap: 15px;
    align-items: center;
}

.btn-login {
    font-weight: 600;
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: 8px;
    transition: background-color 0.3s;
}

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

/* 全局按钮样式 - 增强立体感与区分度 */
.btn-get, .btn-primary-large, .btn-buy, .btn-download, .btn-giant {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #ffffff;
    font-weight: 700;
    border-radius: 8px;
    text-align: center;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
    box-shadow: var(--button-shadow);
    transition: all 0.3s ease;
    border: 1px solid rgba(255,255,255,0.1);
    cursor: pointer;
}

.btn-get {
    padding: 8px 24px;
}

.btn-get:hover, .btn-primary-large:hover, .btn-buy:hover, .btn-download:hover, .btn-giant:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(16, 185, 129, 0.6);
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
}

.btn-get:active, .btn-primary-large:active, .btn-buy:active, .btn-download:active, .btn-giant:active {
    transform: translateY(1px);
    box-shadow: 0 2px 8px 0 rgba(16, 185, 129, 0.4);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background-color: var(--text-main);
    border-radius: 3px;
    transition: 0.3s;
}

/* 首屏横幅区 - 双栏布局 */
.hero {
    position: relative;
    padding: 160px 20px 100px;
    background: radial-gradient(circle at center, var(--bg-light) 0%, var(--bg-main) 100%);
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
    position: relative;
    z-index: 2;
}

.hero-art {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 1;
}

/* 矢量图动画特效 */
.animated-svg {
    width: 100%;
    max-width: 500px;
    height: auto;
}

.float-anim {
    animation: floating 4s ease-in-out infinite;
}

.pulse-anim {
    animation: pulsing 2s ease-in-out infinite alternate;
}

.data-stream {
    stroke-dasharray: 10;
    animation: stream 1s linear infinite;
}

@keyframes floating {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

@keyframes pulsing {
    0% { opacity: 0.6; filter: drop-shadow(0 0 5px var(--primary)); }
    100% { opacity: 1; filter: drop-shadow(0 0 15px var(--primary-light)); }
}

@keyframes stream {
    to { stroke-dashoffset: -20; }
}

.discount-tag {
    display: inline-flex;
    align-items: center;
    background-color: rgba(16, 185, 129, 0.15);
    color: var(--primary-light);
    padding: 6px 16px;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 24px;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--text-main);
}

.hero h1 span {
    color: var(--primary);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 40px;
}

.btn-primary-large {
    padding: 16px 40px;
    font-size: 1.25rem;
    border-radius: 12px;
}

/* 核心优势图卡区 */
.features {
    padding: 100px 0;
    background-color: var(--bg-main);
    border-top: 1px solid var(--border);
}

.feature-grid, .streaming-ai-grid {
    display: grid;
    gap: 30px;
    margin-bottom: 30px;
}

.feature-grid {
    grid-template-columns: repeat(3, 1fr);
}

.streaming-ai-grid {
    grid-template-columns: repeat(2, 1fr);
}

.feature-card, .special-card {
    background-color: var(--bg-light);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--border);
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

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

.icon {
    font-size: 3rem;
    margin-bottom: 20px;
    filter: drop-shadow(0 0 8px rgba(16, 185, 129, 0.4));
}

.feature-card h3, .special-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-main);
}

.feature-card p, .special-card p {
    color: var(--text-light);
}

/* 定价卡片区 */
.pricing {
    padding: 100px 0;
    background-color: var(--bg-dark);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    align-items: center;
}

.pricing-card {
    background-color: var(--bg-main);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow);
    position: relative;
    border: 1px solid var(--border);
    transition: transform 0.3s;
}

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

.pricing-card.recommended {
    transform: scale(1.05);
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-main) 100%);
    border: 2px solid var(--primary);
    box-shadow: 0 0 30px rgba(16, 185, 129, 0.2);
    z-index: 2;
}

.pricing-card.recommended:hover {
    transform: scale(1.05) translateY(-5px);
}

.tag-recommended {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    color: #111827;
    padding: 6px 20px;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 800;
    box-shadow: 0 4px 10px rgba(16, 185, 129, 0.4);
}

.pricing-card h3 {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 15px;
}

.price {
    font-size: 1rem;
    color: var(--text-main);
    margin-bottom: 30px;
}

.price span {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-light);
}

.plan-features {
    text-align: left;
    margin-bottom: 30px;
}

.plan-features li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    color: var(--text-light);
    display: flex;
    align-items: center;
}

.plan-features li::before {
    content: '✓';
    color: var(--primary);
    margin-right: 12px;
    font-weight: 900;
    font-size: 1.1rem;
}

.btn-buy {
    width: 100%;
    padding: 14px 0;
    font-size: 1.125rem;
}

/* 客户端下载区 */
.download {
    padding: 100px 0;
    background-color: var(--bg-main);
    border-top: 1px solid var(--border);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.download-card {
    background-color: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    transition: border-color 0.3s, background-color 0.3s;
}

.download-card:hover {
    border-color: var(--primary);
    background-color: #273345;
}

.download-card h3 {
    margin-bottom: 10px;
}

.download-card p {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 20px;
    min-height: 40px;
}

.btn-download {
    padding: 10px 0;
    width: 100%;
    font-size: 1rem;
}

/* 深度特性解析区 */
.why-choose {
    padding: 100px 0;
    background-color: var(--bg-dark);
}

.seo-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.seo-card {
    background-color: var(--bg-main);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.seo-card h4 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: var(--primary-light);
}

/* 用户评价跑马灯 */
.testimonials {
    padding: 100px 0;
    background-color: var(--bg-main);
    overflow: hidden;
    border-top: 1px solid var(--border);
}

.marquee-container {
    width: 100%;
    overflow: hidden;
    position: relative;
    padding: 20px 0;
}

.marquee-container::before,
.marquee-container::after {
    content: '';
    position: absolute;
    top: 0;
    width: 150px;
    height: 100%;
    z-index: 2;
}

.marquee-container::before {
    left: 0;
    background: linear-gradient(to right, var(--bg-main), transparent);
}

.marquee-container::after {
    right: 0;
    background: linear-gradient(to left, var(--bg-main), transparent);
}

.marquee-content {
    display: flex;
    width: max-content;
    animation: marquee 35s linear infinite;
}

.marquee-content:hover {
    animation-play-state: paused;
}

@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.review-card {
    width: 350px;
    background-color: var(--bg-light);
    padding: 30px;
    border-radius: 16px;
    margin: 0 15px;
    flex-shrink: 0;
    border: 1px solid var(--border);
}

.stars {
    color: var(--primary-light);
    font-size: 1.5rem;
    margin-bottom: 15px;
    letter-spacing: 2px;
}

.review-text {
    font-style: italic;
    color: var(--text-main);
    margin-bottom: 20px;
}

.author {
    font-weight: 700;
    color: var(--text-light);
}

/* 常见问题解答区 */
.faq {
    padding: 100px 0;
    background-color: var(--bg-dark);
}

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

details {
    background-color: var(--bg-main);
    margin-bottom: 15px;
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: background-color 0.3s;
}

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

summary {
    padding: 20px;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    position: relative;
    color: var(--text-main);
}

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

summary::after {
    content: '+';
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    color: var(--primary);
    transition: transform 0.3s;
}

details[open] summary::after {
    transform: translateY(-50%) rotate(45deg);
}

details p {
    padding: 0 20px 20px;
    color: var(--text-light);
    line-height: 1.7;
}

/* 底部转化区 */
.bottom-cta {
    padding: 100px 20px;
    background: linear-gradient(135deg, var(--bg-light), var(--bg-main));
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    text-align: center;
}

.bottom-cta h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--text-main);
}

.bottom-cta p {
    font-size: 1.25rem;
    margin-bottom: 40px;
    color: var(--text-light);
}

.btn-giant {
    padding: 20px 60px;
    font-size: 1.5rem;
    border-radius: 9999px;
    font-weight: 800;
}

/* 页脚 */
.footer {
    background-color: #05080f;
    color: var(--text-light);
    padding: 60px 0 30px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-light);
    transition: color 0.2s;
}

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

.copyright {
    font-size: 0.875rem;
    opacity: 0.6;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-art {
        margin-top: 40px;
    }

    .feature-grid, .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-card.recommended {
        transform: scale(1);
    }
    
    .pricing-card.recommended:hover {
        transform: translateY(-5px);
    }
    
    .download-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-links, .nav-buttons {
        display: none;
        flex-direction: column;
        width: 100%;
        text-align: center;
        background-color: rgba(17, 24, 39, 0.95);
        backdrop-filter: blur(15px);
        padding: 20px 0;
        border-bottom: 1px solid var(--border);
    }
    
    .nav-links.active, .nav-buttons.active {
        display: flex;
        position: absolute;
        top: 65px;
        left: 0;
    }
    
    .nav-buttons.active {
        top: 250px;
        padding-bottom: 25px;
    }

    .hamburger.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
        background-color: var(--primary);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
        background-color: var(--primary);
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .feature-grid, .streaming-ai-grid, .pricing-grid, .download-grid, .seo-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card.recommended {
        border-width: 1px;
    }

    .btn-buy, .btn-download, .btn-primary-large, .btn-giant {
        padding-top: 15px;
        padding-bottom: 15px;
        font-size: 1.125rem;
    }

    .section-title {
        font-size: 1.8rem;
    }
}