/* 必须使用box-sizing: border-box; */

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 7vw;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    background: rgba(12, 34, 51, 0.5);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(41, 182, 246, 0.2);
    transition: 0.6s ease-out;
    box-sizing: border-box;
}

.main-header.scroll-out {
    top: -100px;
    opacity: 0;
}

.main-header-left {
    display: flex;
    align-items: center;
    justify-content: start;
    gap: 15px;
    transform-origin: 0% 50%;
}

.main-header-logo {
    fill: #29b6f6;
}

.main-header-logo-g {
    transform: translate(-4px, 9px) scale(0.1);
}

.main-header-title-group {
    white-space: nowrap;
}

.main-header-main-title {
    font-size: 1.5rem;
    margin: 0;
}

.main-header-sub-title {
    font-size: 0.8rem;
    margin: 0;
}

.main-header-right {
    display: flex;
    gap: 20px;
    justify-content: end;
    align-items: center;
}

.normal-btn {
    padding: 0px 20px;
    border: 1px solid #4fc3f7;
    border-radius: 20px;
    height: 37px;
    line-height: 37px;
    text-align: center;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;

    background: linear-gradient(90deg, #00ffcc, #0099ff);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.disappear {
    display: none !important;
}

.mobile-menu-container {
    position: absolute;
    z-index: 200;
    top: 21px;
    right: 7vw;
}

.mobile-menu-btn {
    --size: 50px;
    width: var(--size);
    height: var(--size);
    border-radius: 50%;
    background-color: rgba(12, 34, 51, 0.6);
    border: 1px solid #0099ff88;
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.mobile-menu-btn .bar {
    width: 18px;
    height: 2px;
    background-color: #4fc3f7;
    border-radius: 3px;
    margin: 2px 0;
    transition: all 0.3s ease;
}

.mobile-menu-content {
    --border-color: rgba(41, 182, 246, 0.3);
    position: absolute;
    top: 60px;
    right: 0;
    width: 200px;
    background-color: rgba(12, 34, 51, 0.95);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    padding: 0;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.3);
    transform: scale(0.8);
    transform-origin: top right;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;

    display: flex;
    flex-direction: column;
    justify-content: start;
    align-items: center;
}

.mobile-menu-item {
    width: 85%;
    padding: 3px;
    height: 50px;
    border: none;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    font-size: 15px;
    position: relative;
}

.mobile-menu-content .mobile-menu-item:last-child {
    border-bottom: none;
}

.mobile-menu-container.active .mobile-menu-item::before {
    content: ">";
    position: absolute;
    top: 32%;
    --right: 17%;
    right: var(--right);
    font-size: 18px;
    background: inherit;
    background-clip: inherit;
    -webkit-background-clip: inherit;
    color: inherit;
    animation: arrowMove 1.6s infinite ease-in-out;
    opacity: 0;
    transition: 0.2s linear;
}

.mobile-menu-container.active .mobile-menu-item:hover::before {
    opacity: 1;
}

@keyframes arrowMove {
    50% {
        right: 12%;
    }
    100% {
        right: var(--right);
    }
}

.mobile-menu-container.active .mobile-menu-btn {
    border-radius: 8px;
    background-color: rgba(12, 34, 51, 0.95);
}

.mobile-menu-container.active .mobile-menu-btn .bar {
    width: 22px;
    height: 2px;
}

.mobile-menu-container.active .mobile-menu-btn .bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.mobile-menu-container.active .mobile-menu-btn .bar:nth-child(2) {
    opacity: 0;
}

.mobile-menu-container.active .mobile-menu-btn .bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.mobile-menu-container.active .mobile-menu-content {
    transform: scale(1);
    opacity: 1;
    pointer-events: auto;
}

.menu-open {
    overflow: hidden;
}

/* you should auto add: 'color-text' like: */
/* .color-text {
    background: linear-gradient(90deg, #00ffcc, #0099ff);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
} */