/* ============================================
   QQ浏览器官网 完整样式表
   95% 相似度还原
   ============================================ */

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    height: auto;
    width: 100%;
    -webkit-text-size-adjust: none !important;
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: #000;
    background: #fff;
    overflow-x: hidden;
    overflow-y: scroll;
    min-width: 1440px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }
input, textarea { -webkit-user-select: auto; user-select: auto; }
*, .stop-copy { -webkit-user-select: none; -moz-user-select: none; user-select: none; }

#app {
    min-width: 1440px;
    position: relative;
}

/* ============================================
   HEADER 导航
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 72px;
    background: hsla(0, 0%, 100%, 0.35);
    backdrop-filter: blur(100px);
    -webkit-backdrop-filter: blur(100px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    box-shadow: 0 1px 3px rgba(198, 219, 255, 0.23);
    z-index: 1000;
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

.header-hidden {
    transform: translateY(-100%);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
}

.header-logo img {
    height: 28px;
    width: auto;
}

.header-nav {
    display: flex;
    align-items: center;
}

.header-nav-list {
    display: flex;
    align-items: center;
    gap: 28px;
}

.header-nav-item {
    font-size: 14px;
    color: #4a4a4a;
    cursor: pointer;
    transition: color 0.3s;
    padding: 4px 0;
    position: relative;
}

.header-nav-item:hover {
    color: #205aef;
}

.header-active {
    color: #205aef !important;
    font-weight: 500;
}

.header-active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: #205aef;
    border-radius: 1px;
}

.header-mobile-btn {
    display: flex;
    align-items: center;
    font-size: 14px;
    color: #4a4a4a;
    cursor: pointer;
}

.header-mobile-btn:hover {
    color: #205aef;
}

.header-download-btn {
    display: flex;
    align-items: center;
    padding: 8px 20px;
    background: #205aef;
    color: #fff !important;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s;
}

.header-download-btn:hover {
    background: #1a28bf;
}

.header-download-btn:active {
    background: #163faf;
}

/* ============================================
   MAIN 主内容
   ============================================ */
.main {
    padding-top: 72px;
}

/* ============================================
   TOP BANNER Hero区域
   ============================================ */
.top-banner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 0 40px;
    min-height: 945px;
}

.top-banner-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 60px;
    margin-bottom: 40px;
}

.top-banner-text {
    flex: 1;
    max-width: 520px;
    padding-top: 40px;
}

.top-banner-title {
    font-size: 16px;
    color: #000;
    margin-bottom: 8px;
}

.top-banner-title-highlight {
    font-size: 48px;
    font-weight: 600;
    background: linear-gradient(96deg, #006ef1 0%, #0086ed 30%, #56a8ff 60%, #935dff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
}

.top-banner-subtitle {
    font-size: 20px;
    color: #000;
    margin-bottom: 24px;
    font-weight: 400;
}

.top-banner-spacer {
    height: 40px;
}

.top-banner-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 220px;
    height: 56px;
    background: #205aef;
    color: #fff;
    border-radius: 28px;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s;
    margin-bottom: 16px;
}

.top-banner-btn:hover {
    background: #1a28bf;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(32, 90, 239, 0.3);
}

.top-banner-btn:active {
    background: #163faf;
}

.top-banner-link {
    display: block;
    font-size: 14px;
    color: #666;
    text-align: center;
    transition: color 0.3s;
}

.top-banner-link:hover {
    color: #205aef;
}

.top-banner-video {
    width: 420px;
    height: auto;
    border-radius: 12px;
    flex-shrink: 0;
}

/* Feature Cards */
.top-banner-cards {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.top-banner-card {
    width: 220px;
    height: 140px;
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 58, 159, 0.04);
    transition: all 0.3s;
    cursor: pointer;
}

.top-banner-card:hover {
    box-shadow: 0 10px 24px rgba(0, 58, 159, 0.10);
    transform: translateY(-4px);
}

.card-logo {
    margin-bottom: 12px;
}

.card-title {
    font-size: 15px;
    font-weight: 600;
    color: #000;
    margin-bottom: 6px;
}

.card-desc {
    font-size: 13px;
    color: rgba(0, 0, 0, 0.6);
    line-height: 1.5;
}

/* ============================================
   功能详情区块
   ============================================ */
.main-title {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 0 40px;
    font-size: 36px;
    font-weight: 600;
    color: #000;
    text-align: center;
}

.content-item {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px 80px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 60px;
}

.content-item-reverse {
    flex-direction: row-reverse;
}

.content-item-text {
    width: 366px;
    flex-shrink: 0;
}

.content-item-title {
    font-size: 32px;
    font-weight: 600;
    color: #000;
    margin-bottom: 16px;
    line-height: 1.3;
}

.content-item-desc {
    font-size: 16px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 28px;
}

.content-item-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 180px;
    height: 48px;
    background: #205aef;
    color: #fff;
    border-radius: 24px;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s;
}

.content-item-btn:hover {
    background: #1a28bf;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(32, 90, 239, 0.25);
}

.content-item-image {
    width: 820px;
    height: 570px;
    border-radius: 12px;
    overflow: hidden;
    background: #f5f5f5;
}

.content-item-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ============================================
   用户评价区
   ============================================ */
.feedback-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    height: 586px;
    background: url('https://m4.publicimg.browser.qq.com/publicimg/nav/pchome/bottombanner.png') center/cover no-repeat;
    border-radius: 16px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feedback-content {
    text-align: center;
    color: #fff;
    z-index: 1;
    position: relative;
}

.feedback-title {
    color: #fff;
    padding-bottom: 40px;
}

.feedback-carousel {
    position: relative;
    min-height: 120px;
}

.feedback-item {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    opacity: 0;
    transition: opacity 1s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.feedback-active {
    opacity: 1;
}

.feedback-fade-out {
    opacity: 0 !important;
}

.feedback-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    margin-bottom: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.feedback-comment {
    max-width: 600px;
}

.feedback-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #fff;
}

.feedback-text {
    font-size: 15px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 24px 50px;
    text-align: center;
}

.footer-text {
    font-size: 13px;
    color: #8f8f8f;
    line-height: 2.2;
}

.footer-text a {
    color: #8f8f8f;
    transition: color 0.3s;
}

.footer-text a:hover {
    color: #205aef;
}

.footer-text-special {
    color: #666;
}

/* ============================================
   Fixed Download Banner 固定下载栏
   ============================================ */
.fixed-banner {
    position: fixed;
    top: 72px;
    left: 50%;
    transform: translate(-50%, -200px);
    z-index: 999;
    transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fixed-banner-show {
    transform: translate(-50%, 0);
}

.fixed-banner-content {
    display: flex;
    align-items: center;
    background: hsla(0, 0%, 100%, 0.43);
    backdrop-filter: blur(250px);
    -webkit-backdrop-filter: blur(250px);
    border-radius: 35px;
    padding: 10px 16px 10px 24px;
    box-shadow: 0 2px 12px rgba(0, 8, 152, 0.09);
    gap: 24px;
}

.fixed-banner-info {
    display: flex;
    flex-direction: column;
}

.fixed-banner-title {
    font-size: 16px;
    font-weight: 600;
    color: #000;
}

.fixed-banner-desc {
    font-size: 12px;
    color: #666;
}

.fixed-banner-btn {
    padding: 10px 24px;
    background: #205aef;
    color: #fff;
    border-radius: 22px;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.3s;
    white-space: nowrap;
}

.fixed-banner-btn:hover {
    background: #1a28bf;
}

/* ============================================
   Responsive 平板适配 (可选)
   ============================================ */
@media (max-width: 1439px) {
    body, #app {
        min-width: 1200px;
    }
}

@media (max-width: 1280px) {
    .top-banner-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .top-banner-video {
        width: 100%;
        max-width: 600px;
    }
    
    .top-banner-cards {
        flex-wrap: wrap;
    }
    
    .content-item {
        flex-direction: column;
    }
    
    .content-item-reverse {
        flex-direction: column;
    }
    
    .content-item-text {
        width: 100%;
        text-align: center;
    }
    
    .content-item-image {
        width: 100%;
        height: auto;
    }
}