/* ========== 全局重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: #f5f7fa;
    color: #1a2a3a;
    line-height: 1.5;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

/* ========== 导航栏 ========== */
.header {
    background: #ffffff;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    flex-wrap: wrap;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: #ff6a00;
}

.logo i {
    font-size: 1.6rem;
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
    flex-wrap: wrap;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: 0.2s;
}

.nav-links a:hover {
    color: #ff6a00;
}

.btn-download-nav {
    background: #ff6a00;
    color: white !important;
    padding: 8px 24px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
}

.btn-download-nav:hover {
    background: #e55a00;
}

/* ========== Hero 首屏 ========== */
.hero {
    padding: 70px 0;
    background: linear-gradient(135deg, #fff5eb 0%, #ffffff 100%);
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
}

.hero-content {
    flex: 1.2;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    border-radius: 20px;
    box-shadow: 0 20px 35px -12px rgba(0, 0, 0, 0.15);
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: #ff6a00;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: #4a5a6a;
    margin-bottom: 12px;
}

.hero-desc {
    font-size: 1rem;
    color: #6a7a8a;
    margin-bottom: 28px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 40px;
    text-decoration: none;
    font-weight: 600;
    transition: 0.2s;
}

.btn-primary {
    background: #ff6a00;
    color: white;
}

.btn-primary:hover {
    background: #e55a00;
    transform: translateY(-2px);
}

.btn-secondary {
    border: 2px solid #ff6a00;
    color: #ff6a00;
}

.btn-secondary:hover {
    background: #ff6a00;
    color: white;
}

.hero-stats {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    color: #ff6a00;
}

.stat-label {
    font-size: 0.85rem;
    color: #6a7a8a;
}

/* ========== 通用区块 ========== */
.section-title {
    text-align: center;
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: #1a2a3a;
}

.section-subtitle {
    text-align: center;
    color: #6a7a8a;
    max-width: 680px;
    margin: 0 auto 48px;
}

/* ========== 核心功能 ========== */
.features {
    padding: 70px 0;
    background: #ffffff;
}

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

.feature-card {
    background: #fafbfc;
    border-radius: 20px;
    padding: 32px 24px;
    text-align: center;
    transition: 0.25s;
    border: 1px solid #eef2f5;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: #fff0e3;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
    color: #ff6a00;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: #6a7a8a;
    font-size: 0.9rem;
}

@media (max-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 550px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== 性能对比 ========== */
.performance {
    padding: 70px 0;
    background: #f8fafc;
}

.comparison-item {
    margin-bottom: 24px;
}

.comparison-item h4 {
    margin-bottom: 8px;
    font-size: 1rem;
}

.bar-container {
    background: #e4e8ec;
    border-radius: 12px;
    overflow: hidden;
}

.bar {
    padding: 10px 16px;
    border-radius: 12px;
    color: white;
    font-size: 0.8rem;
    font-weight: 600;
}

.sogou-bar {
    background: #ff6a00;
}

.other-bar {
    background: #9aaebf;
    margin-top: 4px;
}

/* ========== 安全防护 ========== */
.security {
    padding: 70px 0;
    background: #ffffff;
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.security-card {
    background: #fafbfc;
    border-radius: 20px;
    padding: 28px 20px;
    text-align: center;
    border: 1px solid #eef2f5;
}

.security-icon {
    font-size: 2.5rem;
    color: #ff6a00;
    margin-bottom: 16px;
}

.security-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.security-card p {
    font-size: 0.85rem;
    color: #6a7a8a;
}

@media (max-width: 900px) {
    .security-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 550px) {
    .security-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== 扩展支持 ========== */
.extensions {
    padding: 70px 0;
    background: #f8fafc;
}

.extensions-content {
    display: flex;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
}

.extensions-list {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.extension-item {
    background: white;
    padding: 16px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid #eef2f5;
    font-weight: 500;
}

.extension-item i {
    color: #ff6a00;
    margin-right: 8px;
}

.extensions-desc {
    flex: 1;
    text-align: center;
}

.btn-outline {
    display: inline-block;
    margin-top: 20px;
    padding: 10px 24px;
    border: 2px solid #ff6a00;
    border-radius: 40px;
    text-decoration: none;
    color: #ff6a00;
    font-weight: 600;
}

.btn-outline:hover {
    background: #ff6a00;
    color: white;
}

/* ========== 跨平台 ========== */
.platforms {
    padding: 70px 0;
    background: #ffffff;
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.platform-card {
    background: #fafbfc;
    border-radius: 20px;
    padding: 32px 20px;
    text-align: center;
    border: 1px solid #eef2f5;
}

.platform-icon {
    font-size: 3rem;
    color: #ff6a00;
    margin-bottom: 16px;
}

.platform-card h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.platform-card p {
    font-size: 0.8rem;
    color: #6a7a8a;
    margin-bottom: 20px;
}

.btn-platform {
    display: inline-block;
    padding: 8px 24px;
    background: #ff6a00;
    color: white;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
}

.btn-platform:hover {
    background: #e55a00;
}

@media (max-width: 900px) {
    .platforms-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 550px) {
    .platforms-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== FAQ ========== */
.faq {
    padding: 70px 0;
    background: #f8fafc;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.faq-column h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: #ff6a00;
}

.faq-column ul {
    list-style: none;
}

.faq-column li {
    margin-bottom: 10px;
}

.faq-column a {
    text-decoration: none;
    color: #4a5a6a;
    font-size: 0.85rem;
}

.faq-column a:hover {
    color: #ff6a00;
}

@media (max-width: 900px) {
    .faq-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 550px) {
    .faq-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== 下载引导 ========== */
.download {
    padding: 70px 0;
    background: linear-gradient(135deg, #ff6a00, #ff8c3a);
    color: white;
}

.download .section-title,
.download .section-subtitle {
    color: white;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin: 40px 0 24px;
}

.btn-download-large {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    background: white;
    color: #ff6a00;
    padding: 18px 32px;
    border-radius: 20px;
    text-decoration: none;
    min-width: 180px;
    transition: 0.2s;
}

.btn-download-large:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.btn-download-large i {
    font-size: 2rem;
}

.btn-download-large span {
    font-size: 1rem;
    font-weight: 700;
}

.btn-download-large small {
    font-size: 0.7rem;
    color: #8a9aaa;
}

.download-note {
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.85;
}

.download-note a {
    color: white;
    text-decoration: underline;
}

/* ========== 页脚 ========== */
.footer {
    background: #1a2a3a;
    color: #a0b0c0;
    padding: 56px 0 32px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-logo .logo {
    font-size: 1.3rem;
    color: #ff6a00;
}

.footer-links {
    display: flex;
    gap: 48px;
    flex-wrap: wrap;
}

.footer-column h4 {
    color: white;
    margin-bottom: 16px;
}

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

.footer-column li {
    margin-bottom: 8px;
}

.footer-column a {
    text-decoration: none;
    color: #a0b0c0;
    font-size: 0.85rem;
}

.footer-column a:hover {
    color: #ff6a00;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    padding-top: 24px;
    border-top: 1px solid #2a3a4a;
}

.social-icons {
    display: flex;
    gap: 16px;
}

.social-icons a {
    color: #a0b0c0;
    font-size: 1.2rem;
}

.social-icons a:hover {
    color: #ff6a00;
}

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: #ff6a00;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    display: none;
    align-items: center;
    justify-content: center;
    transition: 0.2s;
    z-index: 99;
}

.back-to-top:hover {
    background: #e55a00;
    transform: translateY(-3px);
}

/* ========== 响应式补充 ========== */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
    }
    .hero-title {
        font-size: 2.2rem;
    }
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    .hero-stats {
        justify-content: center;
    }
    .hero-buttons {
        justify-content: center;
    }
    .extensions-list {
        grid-template-columns: repeat(2, 1fr);
    }
}