:root {
    --primary: #165DFF;
    --primary-dark: #0F3AAA;
    --primary-light: #E8F3FF;
    --secondary: #36CFC9;
    --success: #52C41A;
    --warning: #FAAD14;
    --danger: #FF4D4F;
    --text-primary: #1D2129;
    --text-secondary: #4E5969;
    --text-tertiary: #86909C;
    --border-light: #E5E6EB;
    --bg-light: #F7F8FA;
    --bg-white: #FFFFFF;
    --container-width: 1200px;
    --header-height: 80px;
    --header-height-m: 70px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-round: 50%;
    --transition-base: all 0.3s ease-out;
    --transition-fast: all 0.2s ease-out;
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    scrollbar-width: thin;
}

body {
    font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    padding-top: var(--header-height);
    transition: padding-right 0.2s ease-out;
}

/* 修复滚动条消失导致的页面晃动 */
body.no-scroll {
    overflow: hidden;
    padding-right: calc(100vw - 100%);
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

.bg-light { background-color: var(--bg-light); }
.bg-white { background-color: var(--bg-white); }

.section-padding {
    padding: var(--spacing-xxl) 0;
}

.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

/* 图片固定宽高比，防止加载重排导致晃动 */
img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
    display: block;
}

.img-container {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: inherit;
}

ul {
    list-style: none;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 500;
    line-height: 1;
    text-align: center;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
    border: none;
    outline: none;
    gap: 8px;
    will-change: background-color, box-shadow;
}

.btn-primary {
    background-color: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: #fff;
    box-shadow: 0 4px 12px rgba(22, 93, 255, 0.3);
}

.btn-secondary {
    background-color: #fff;
    color: var(--primary);
    border: 1px solid var(--primary);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

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

.btn-card {
    width: 100%;
    background-color: var(--primary-light);
    color: var(--primary);
    font-weight: 500;
}

.btn-card:hover {
    background-color: var(--primary);
    color: #fff;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 18px;
}

/* 导航栏固定高度，消除滚动过渡卡顿 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: #fff;
    box-shadow: var(--shadow-sm);
    z-index: 999;
    transition: var(--transition-base);
    will-change: transform, box-shadow;
    transform: translateZ(0);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo img {
    display: block;
}

.nav-desktop ul {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-desktop a {
    display: block;
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 500;
    border-bottom: 2px solid transparent;
}

.nav-desktop a.active,
.nav-desktop a:hover {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
}

.menu-toggle {
    display: none;
    font-size: 24px;
    color: var(--text-primary);
    cursor: pointer;
    background: transparent;
    border: none;
    outline: none;
}

.nav-mobile {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: #fff;
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg) 0;
    z-index: 998;
    transform: translateZ(0);
}

.nav-mobile.active {
    display: block;
}

.nav-mobile ul {
    padding: 0 var(--spacing-md);
}

.nav-mobile li {
    border-bottom: 1px solid var(--border-light);
}

.nav-mobile a {
    display: block;
    padding: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 16px;
}

.nav-mobile a.active {
    color: var(--primary);
    font-weight: 500;
}

.legal-links {
    display: flex;
    gap: var(--spacing-lg);
}

.section-header {
    margin-bottom: var(--spacing-xxl);
    text-align: center;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

.hero-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    padding: 80px 0 120px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('./images/reserve/hero-bg.png') no-repeat center/cover;
    opacity: 0.1;
    z-index: 0;
}

.hero-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xxl);
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.hero-desc {
    font-size: 20px;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.hero-btns {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.hero-tags span {
    padding: 6px 16px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 100px;
    font-size: 14px;
}

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

.hero-image img {
    margin: 0 auto 0 0;
}

/* 卡片hover优化，消除重排晃动 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-xl);
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    text-align: center;
    will-change: transform, box-shadow;
    transform: translateZ(0);
}

.feature-card:hover {
    transform: translateY(-8px) translateZ(0);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background-color: var(--primary-light);
    border-radius: var(--radius-round);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature-desc {
    color: var(--text-tertiary);
    font-size: 15px;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.download-card {
    padding: var(--spacing-xl);
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition-base);
    will-change: box-shadow;
}

.download-card:hover {
    box-shadow: var(--shadow-md);
}

.download-icon {
    margin: 0 auto var(--spacing-lg);
}

.download-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.download-desc {
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-lg);
}

.download-meta {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    font-size: 14px;
    color: var(--text-tertiary);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.news-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    will-change: transform, box-shadow;
    transform: translateZ(0);
}

.news-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px) translateZ(0);
}

.news-image {
    height: 200px;
    overflow: hidden;
}

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

.news-content {
    padding: var(--spacing-xl);
}

.news-date {
    font-size: 14px;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.news-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.news-title a {
    color: var(--text-primary);
}

.news-title a:hover {
    color: var(--primary);
}

.news-desc {
    color: var(--text-tertiary);
    font-size: 15px;
    margin-bottom: var(--spacing-lg);
}

.news-more {
    display: inline-flex;
    align-items: center;
    font-size: 14px;
    color: var(--primary);
    gap: 4px;
    transition: gap 0.2s ease-out;
}

.news-more:hover {
    gap: 8px;
}

.news-more-btn {
    margin-top: var(--spacing-lg);
}

.cta-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    padding: var(--spacing-xxl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-inner {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta-desc {
    font-size: 18px;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.footer {
    background-color: #0A1428;
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo img {
    margin-bottom: var(--spacing-md);
}

.footer-desc {
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-round);
    color: #fff;
    font-size: 18px;
    transition: var(--transition-fast);
}

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

.footer-title {
    font-size: 18px;
    font-weight: 600;
    color: #fff;
    margin-bottom: var(--spacing-lg);
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
}

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

.footer-contact li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 14px;
}

.footer-divider {
    height: 1px;
    background-color: rgba(255, 255, 255, 0.1);
    margin-bottom: var(--spacing-lg);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

/* 响应式适配修复，消除断点处布局抖动 */
@media (max-width: 992px) {
    .hero-title {
        font-size: 40px;
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .download-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .news-grid {
        grid-template-columns: 1fr;
    }
    .footer-top {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero-inner {
        gap: var(--spacing-xl);
    }
}

@media (max-width: 768px) {
    body {
        padding-top: var(--header-height-m);
    }
    .header {
        height: var(--header-height-m);
    }
    .nav-mobile {
        top: var(--header-height-m);
    }
    .menu-toggle {
        display: block;
    }
    .hero-inner {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-lg);
    }
    .hero-content {
        order: 2;
    }
    .hero-image {
        order: 1;
        text-align: center;
    }
    .hero-image img {
        margin: 0 auto;
    }
    .hero-title {
        font-size: 32px;
    }
    .section-title {
        font-size: 28px;
    }
    .section-desc {
        font-size: 16px;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .download-grid {
        grid-template-columns: 1fr;
    }
    .footer-top {
        grid-template-columns: 1fr;
    }
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    .cta-title {
        font-size: 28px;
    }
    .hero-btns {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-btns {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    .btn {
        width: 100%;
    }
    .hero-section {
        padding: 60px 0 80px;
    }
    .section-padding {
        padding: var(--spacing-xl) 0;
    }
}