body {
    font-family: 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', Arial, sans-serif;
    background: #f7f8fa;
    background-size: auto;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-center {
    width: max-content;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.site-logo {
    display: block;
    width: 216.5px;
    height: 73.5px;
    background-image: url('images/logo-black.png');
    background-repeat: no-repeat;
    background-size: 100% 100%;
    background-position: left top;
    margin: 48px 0 24px 0;
}

.header-bar {
    display: flex;
    align-items: flex-start;
    padding-left: 0;
    margin-top: 0;
}

.web-home nav {
    display: flex;
    justify-content: flex-start;
    margin: 0 0 32px 0;
    padding-left: 0;
}

.web-home .nav-list {
    display: flex;
    gap: 32px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.web-home .nav-block {
    background: rgba(255, 255, 255, 0.85);
    border-radius: 16px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    padding: 32px 36px;
    min-width: 220px;
    max-width: 320px;
    text-align: center;
    transition: box-shadow 0.2s, transform 0.2s, background 0.2s;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: #222;
    border: none;
}

.web-home .nav-block:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
    transform: translateY(-4px) scale(1.03);
    color: #0078d7;
    background: rgba(240, 246, 255, 0.95);
}

.web-home .nav-block i {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    fill: #0078d7;
    transition: fill 0.2s, background 0.2s;
    background: none;
    border-radius: 8px;
}

.web-home .nav-block:hover i {
    fill: #005fa3;
    background: #e3f2fd;
}

.web-home .nav-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.web-home .nav-desc {
    font-size: 1rem;
    color: #666;
}

footer {
    margin-top: auto;
    background: none;
    text-align: center;
    padding: 32px 0 16px 0;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 1) 100%);
    z-index: 0;
    pointer-events: none;
    border-radius: 0;
}

@media (prefers-color-scheme: dark) {
    footer::before {
        background: linear-gradient(to bottom, rgba(24, 26, 27, 0) 0%, rgba(24, 26, 27, 1) 100%);
    }
}

footer>* {
    position: relative;
    z-index: 1;
}

.page-bg-bottom {
    height: 0;
    position: relative;
    z-index: -1;
}

.page-bg-bottom::after {
    content: '';
    display: block;
    position: absolute;
    right: 0;
    bottom: 0;
    width: 400px;
    height: 400px;
    background: url('images/bg-black.png') no-repeat right bottom;
    background-size: contain;
    pointer-events: none;
    z-index: 0;
}

@media (max-width: 800px) {
    .main-center {
        width: 100%;
        max-width: 100vw;
        box-sizing: border-box;
        padding: 0 8px;
    }
    .site-logo {
        margin: 32px 0 16px 0;
    }
    .header-bar {
        width: 100%;
        margin: 0;
        padding: 0;
    }
    .web-home nav {
        width: 100%;
        margin: 0;
        padding: 0;
    }
    .web-home .nav-list {
        flex-direction: column;
        gap: 16px;
        width: 100%;
        margin: 0;
        padding: 0;
        align-items: stretch;
    }
    .web-home .nav-block {
        background: rgba(255, 255, 255, 0.85);
        width: 95%;
        margin: 0 auto;
        padding: 12px 10px;
        border-radius: 10px;
        box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
        display: flex;
        flex-direction: row;
        align-items: center;
        text-align: left;
    }
    .web-home .nav-block:hover {
        background: rgba(240, 246, 255, 0.95);
    }
    .web-home .nav-block i {
        width: 48px;
        min-width: 48px;
        max-width: 48px;
        height: 48px;
        margin-bottom: 0;
        margin-right: 14px;
        font-size: 2rem;
        flex-shrink: 0;
        align-self: center;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .web-home .nav-block-text {
        display: flex;
        flex-direction: column;
        justify-content: center;
        flex: 1;
    }
    .web-home .nav-title,
    .web-home .nav-desc {
        margin-bottom: 0;
    }
    .web-home .nav-title {
        font-size: 1.05rem;
        font-weight: 600;
        margin-bottom: 4px;
    }
    .web-home .nav-desc {
        font-size: 0.95rem;
        color: #666;
    }
}

@media (max-width: 480px) {
    .web-home .site-logo {
        margin: 24px 0 12px 0;
    }
    .main-center {
        padding: 0 2px;
    }
}

@media (prefers-color-scheme: dark) {
    .web-home .site-logo {
        background-image: url('images/logo-white.png');
    }
}

@media (prefers-color-scheme: dark) {
    body {
        background: #181a1b;
        color: #eee;
    }
    .web-home .nav-block {
        background: rgba(35, 39, 42, 0.85);
        color: #e6e6e6;
        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
    }
    .web-home .nav-block:hover {
        background: rgba(35, 47, 62, 0.95);
        color: #4ea1ff;
    }
    .web-home .nav-block i {
        fill: #4ea1ff;
        background: none;
    }
    .web-home .nav-block:hover i {
        fill: #1e90ff;
        background: #232f3e;
    }
    .web-home .nav-desc {
        color: #aaa;
    }
    footer p,
    footer a,
    footer small {
        color: #888;
    }
    footer a:hover {
        color: #4ea1ff;
    }
    .page-bg-bottom::after {
        background: url('images/bg-white.png') no-repeat right bottom;
        background-size: contain;
    }
}


/** about us **/

.about-header-center {
    width: 980px;
    margin: 0 0 0 32px;
}

.about-body-center {
    width: 90%;
    margin: 0 0 0 32px;
    line-height: 1.6;
}

.web-about .site-logo {
    display: block;
    width: 216.5px;
    height: 73.5px;
    background-image: url('images/logo-black.png');
    background-repeat: no-repeat;
    background-size: 100% 100%;
    background-position: left top;
    margin: 20px 0 12px 0;
}

.about-nav-bar {
    background: #ccc;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    padding: 0 24px;
    margin-top: 0;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

.about-nav-list {
    display: flex;
    gap: 32px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.about-nav-link {
    background: none;
    border-radius: 0;
    box-shadow: none;
    padding: 18px 0 14px 0;
    min-width: 120px;
    text-align: center;
    transition: color 0.2s, border-bottom 0.2s;
    cursor: pointer;
    text-decoration: none;
    color: #222;
    font-weight: 600;
    font-size: 1.1rem;
    border: none;
    display: block;
    border-bottom: 3px solid transparent;
}

.about-nav-link.active {
    color: #0078d7;
    border-bottom: 3px solid #0078d7;
    background: none;
}

.about-nav-link.active:hover {
    color: #005fa3;
    border-bottom: 3px solid #005fa3;
    background: none;
}

.about-nav-link:hover {
    color: #0078d7;
    background: none;
}

.important {
    color: #d32f2f;
    font-weight: bold;
    background: #fff3e0;
    padding: 2px 4px;
    border-radius: 4px;
    display: inline;
}

.update_time {
    font-size: 0.6em;
    color: #888;
    margin-left: 12px;
    font-weight: normal;
}

.warn-block {
    background: #fff8e1;
    color: #b26a00;
    border-left: 4px solid #ffb300;
    padding: 12px 16px;
    border-radius: 6px;
    margin: 18px 0 12px 0;
    font-size: 1em;
    line-height: 1.7;
}

.warn-block b {
    text-decoration: underline;
}


/* 新增英文说明样式，仅PC端显示 */

.about-nav-en {
    display: inline-block;
    font-size: 0.72em;
    color: #888;
    margin-left: 6px;
    font-weight: 400;
    vertical-align: middle;
}

@media (max-width: 800px) {
    .about-header-center {
        width: 100%;
        box-sizing: border-box;
        padding: 0 8px;
        margin: 6px 0 0 0;
        margin-top: 0;
    }
    .web-about .site-logo {
        margin: 20px 0 12px 0;
        width: 160px;
        height: 54px;
        max-width: 100%;
    }
    .about-nav-bar {
        padding: 0 2px;
    }
    .about-nav-list {
        flex-direction: row;
        gap: 12px;
    }
    .about-nav-link {
        font-size: 0.92rem;
        padding: 10px 0 8px 0;
    }
    .about-nav-en {
        display: none;
    }
}

@media (prefers-color-scheme: dark) {
    a {
        color: #eee;
    }
    .web-about .site-logo {
        background-image: url('images/logo-white.png');
    }
    .about-nav-bar {
        background: #262a31;
    }
    .about-nav-link {
        color: #e6e6e6;
        border-bottom: 3px solid transparent;
    }
    .about-nav-link.active {
        color: #4ea1ff;
        border-bottom: 3px solid #4ea1ff;
    }
    .about-nav-link.active:hover {
        color: #1e90ff;
        border-bottom: 3px solid #1e90ff;
    }
    .about-nav-link:hover {
        color: #4ea1ff;
    }
    .important {
        color: #ffb4a2;
        background: #2d2320;
    }
    .update_time {
        color: #aaa;
    }
    .warn-block {
        background: #2d2a1a;
        color: #ffd54f;
        border-left: 4px solid #ffd54f;
    }
    .about-nav-en {
        color: #aaa;
    }
    .page-bg-bottom::after {
        background: url('images/bg-white.png') no-repeat right bottom;
        background-size: contain;
    }
}