/* common.css - 所有页面共享的基础样式 */
:root {
    --color-gold: #D4AF37;
    --color-dark: #111111;
    --color-light: #F5F5F7;
    --color-gray: #86868B;
    --color-border: #E6E6E6;
    --transition-base: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.12);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", sans-serif;
    background-color: var(--color-light);
    color: var(--color-dark);
    line-height: 1.5;
    padding-top: 80px;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 苹果风格导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 9999;
    padding: 16px 0;
    background-color: rgba(245, 247, 249, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: var(--transition-base);
}

.header-dark {
    background-color: rgba(17, 17, 17, 0.8);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: #fff;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-gold);
    letter-spacing: 0.5px;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: inherit;
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    opacity: 0.8;
    transition: var(--transition-base);
}

.nav-links a:hover {
    opacity: 1;
    color: var(--color-gold);
}

.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    font-size: 15px;
    color: inherit;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    opacity: 0.9;
}

.menu-toggle:hover {
    opacity: 1;
    color: var(--color-gold);
}

.mobile-menu {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    height: calc(100vh - 60px);
    background-color: rgba(245, 247, 249, 0.96);
    backdrop-filter: blur(20px);
    z-index: 9998;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 28px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
}

.mobile-menu a {
    font-size: 20px;
    color: var(--color-dark);
    text-decoration: none;
    font-weight: 500;
    opacity: 0.85;
}

.mobile-menu a:hover {
    color: var(--color-gold);
    opacity: 1;
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

@media (max-width: 900px) {
    .nav-links { display: none; }
    .menu-toggle { display: block; }
}

/* 页脚 */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    font-size: 13px;
    color: var(--color-gray);
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    background-color: rgba(245, 245, 247, 0.8);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(0, 0, 0, 0.05);
    color: var(--color-dark);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-base);
    opacity: 0;
    visibility: hidden;
    z-index: 9999;
}

.back-to-top.active {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--color-gold);
    color: white;
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

/* 微信二维码弹窗 */
.qrcode-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
}

.qrcode-modal.active {
    opacity: 1;
    visibility: visible;
}

.qrcode-content {
    background-color: white;
    border-radius: 20px;
    padding: 40px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-medium);
    position: relative;
}

.qrcode-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: transparent;
    border: none;
    font-size: 20px;
    color: var(--color-gray);
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
}

.qrcode-close:hover {
    background-color: var(--color-light);
    color: var(--color-gold);
}

.qrcode-img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 12px;
    margin: 20px 0;
}

.qrcode-desc {
    font-size: 16px;
    color: var(--color-dark);
    margin-bottom: 24px;
}

.save-tip {
    font-size: 14px;
    color: var(--color-gray);
    margin-top: 8px;
    display: block;
}

/* 图片预览弹窗 */
.image-preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(8px);
    z-index: 999999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    padding: 20px;
    box-sizing: border-box;
}

.image-preview-modal.active {
    opacity: 1;
    visibility: visible;
}

.image-preview-content {
    max-width: 95vw;
    max-height: 95vh;
    width: auto;
    height: auto;
    position: relative;
    border-radius: 16px;
    overflow: visible;
    box-shadow: 0 10px 50px rgba(0, 0, 0, 0.3);
    transform: scale(0.95);
    transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-preview-modal.active .image-preview-content {
    transform: scale(1);
}

.preview-image {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 16px;
}

.image-preview-close {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    font-size: 24px;
    color: white;
    cursor: pointer;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
    backdrop-filter: blur(8px);
    z-index: 100;
}

.image-preview-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.preview-nav-btn {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    border: none;
    font-size: 32px;
    color: white;
    cursor: pointer;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
    backdrop-filter: blur(8px);
    z-index: 100;
}

.preview-prev {
    left: 20px;
}

.preview-next {
    right: 20px;
}

@media (max-width: 768px) {
    .preview-nav-btn {
        width: 48px;
        height: 48px;
        font-size: 24px;
    }
    .image-preview-close {
        width: 40px;
        height: 40px;
        font-size: 20px;
        top: 15px;
        right: 15px;
    }
    .image-preview-content {
        max-width: 98vw;
        max-height: 90vh;
    }
}