/* ===================================================
   全局导航栏（固定顶部，磨砂玻璃）
   =================================================== */
.global-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 44px;
    background: rgba(29, 29, 31, 0.9);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    z-index: 9999;
    transition: background 0.3s ease;
}

.nav-container {
    max-width: 1024px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo-img {
    height: 18px;
    width: auto;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 28px;
    margin: 0;
    padding: 0;
}

.nav-links a {
    font-size: 12px;
    color: #d1d1d6;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 1;
    color: #fff;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: #d1d1d6;
    font-size: 20px;
    cursor: pointer;
}

/* ===================================================
   全屏模块通用样式（核心：左右贯穿，无间隙堆叠）
   =================================================== */
.full-module {
    width: 100%;
    min-height: 680px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 55px; /* 避开固定导航栏 */
    position: relative;
    overflow: hidden;
    /* 模块之间无间隙，完全贴合 */
    margin: 0;
}

.module-link-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    text-decoration: none;
    color: inherit;
}

.module-inner {
    text-align: center;
    z-index: 2;
    padding: 50px 20px 0;
    max-width: 100%;
}

.module-title {
    font-size: 56px;
    font-weight: 700;
    margin: 0 0 6px;
    letter-spacing: -0.5px;
}

.module-subtitle {
    font-size: 28px;
    font-weight: 400;
    margin: 0 0 18px;
}

.module-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    align-items: center;
    margin-bottom: 40px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    font-size: 17px;
    padding: 10px 24px;
    border-radius: 980px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 400;
}

.btn-blue {
    background-color: #0071e3;
    color: #fff;
    border: 1px solid #0071e3;
}

.btn-blue:hover {
    background-color: #0077ed;
}

.btn-outline-white {
    background: transparent;
    color: #2997ff;
    border: 1px solid #2997ff;
}

.btn-outline-white:hover {
    background: #2997ff;
    color: #fff;
}

.btn-outline-dark {
    background: transparent;
    color: #0066cc;
    border: 1px solid #0066cc;
}

.btn-outline-dark:hover {
    background: #0066cc;
    color: #fff;
}

/* 视觉区域（图片） */
.module-visual {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 1;
    padding: 20px 0 0;
}

.module-img {
    max-width: 100%;
    max-height: 480px;
    object-fit: contain;
    display: block;
}

/* ===================================================
   深色模块（黑色背景）
   =================================================== */
.module-dark {
    background-color: #000;
    color: #f5f5f7;
}

.module-dark .module-title {
    color: #f5f5f7;
}

.module-dark .module-subtitle {
    color: #a1a1a6;
}

/* ===================================================
   浅色模块（白色背景）
   =================================================== */
.module-light {
    background-color: #fbfbfd;
    color: #1d1d1f;
}

.module-light .module-title {
    color: #1d1d1f;
}

.module-light .module-subtitle {
    color: #86868b;
}

/* ===================================================
   首屏英雄区（特殊处理）
   =================================================== */
.module-hero {
    background-color: #000;
    color: #f5f5f7;
    min-height: 100vh;
    justify-content: center;
    padding-top: 44px;
}

.module-hero .module-inner {
    padding: 80px 20px 0;
}

.module-hero .module-title {
    font-size: 64px;
    color: #f5f5f7;
}

.module-hero .module-subtitle {
    font-size: 32px;
    color: #a1a1a6;
}

.hero-img {
    max-width: 90%;
    max-height: 600px;
    object-fit: contain;
}

/* ===================================================
   页脚（苹果风格：浅灰、多列信息）
   =================================================== */
.global-footer {
    background-color: #f5f5f7;
    padding: 20px 0 30px;
    font-size: 12px;
    color: #86868b;
}

.footer-inner {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 22px;
}

.footer-disclaimer {
    margin: 0 0 15px;
    line-height: 1.6;
}

.footer-divider {
    height: 1px;
    background: #d2d2d7;
    margin-bottom: 15px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.copyright {
    margin: 0;
}

.footer-links {
    list-style: none;
    display: flex;
    gap: 10px;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

.footer-links a {
    color: #424245;
    text-decoration: none;
}

.footer-links a:hover {
    text-decoration: underline;
}

.footer-links .divider {
    color: #d2d2d7;
}

/* ===================================================
   滚动渐入动画（苹果风格从下往上淡入）
   =================================================== */
.fade-in-section {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 1s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 1s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: opacity, transform;
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===================================================
   响应式
   =================================================== */
@media (max-width: 1024px) {
    .nav-links {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }
    .module-title {
        font-size: 48px;
    }
    .module-subtitle {
        font-size: 24px;
    }
}

@media (max-width: 768px) {
    .full-module {
        min-height: 580px;
    }
    .module-title {
        font-size: 40px;
    }
    .module-subtitle {
        font-size: 21px;
    }
    .module-cta {
        flex-direction: column;
        gap: 12px;
    }
    .module-img {
        max-height: 360px;
    }
    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .module-title {
        font-size: 32px;
    }
    .module-subtitle {
        font-size: 19px;
    }
    .module-hero .module-title {
        font-size: 44px;
    }
    .module-hero .module-subtitle {
        font-size: 24px;
    }
}