*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 13px;
}

body {
    height: 100vh;
    margin: 0;
    transition: color 0.5s, background-color 0.5s;
    line-height: 1.6;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-family: 'Open Sans', sans-serif;
    color: #313131;
}

/* Header */
.header {
    position: fixed;
    z-index: 999;
    top: 0;
    left: 0;
    height: 60px;
    width: 100%;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    padding: 0 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #fff;
}

.menu {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 10px;
}
.menu .nav {
    display: flex;
    align-items: center;
}
.menu .nav a {
    padding: 0 10px;
    color: #6C6D75;
    text-decoration: none;
    font-weight: 500;
    font-size: 12px;
    transition: color 0.3s;
}
.menu .nav a:hover {
    color: #FF546A;
}
.menu .nav .active {
    color: #313131;
    font-weight: 600;
}


.footer {
    width: 100%;
    background: #000;
    color: #fff;
}
.footer .top {
    padding: 40px 15px;
    text-align: center;
}
.footer .top .title {
    font-weight: 500;
    font-size: 24px;
}
.footer .top .social {
    margin: 24px 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}
.footer .top .social img {
    width: 32px;
}
.footer .top .social a:hover {
    transform: scale(1.3);
    transition: all 0.3s ease;
}
.footer .top .subtitle {
    font-size: 10px;
}
.footer .bottom {
    width: 100%;
    padding: 20px 50px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
}
.footer .bottom .nav {
    width: 100%;
    padding-bottom: 30px;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
}
.footer .bottom .nav a {
    text-decoration: none;
}
.footer .bottom .nav .group {
    padding: 10px;
}
.footer .bottom .nav .group >div {
    cursor: pointer;
    margin-bottom: 10px;
    font-size: 12px;
}
.footer .bottom .nav .group div:first-child {
    color: #fff;
    font-weight: 500;
    font-size: 15px;
}
.footer .bottom .nav .group div:not(:first-child) a {
    color: #e0e0e0;
}
.footer .bottom .identifier {
    text-align: left;
}
.footer .bottom .identifier div {
    color: #565B5E;
}
.footer .copyright {
    border-top: 1px solid #313131;
    padding: 15px 0 20px;
    text-align: center;
    font-size: 11px;
}

/* Dropdown */
.dropdown {
    position: relative;
    display: inline-block;
    border-radius: 5px;
}
.dropdown >* {
    font-size: 12px;
}
.dropdown img {
    height: 10px;
    vertical-align: middle;
}
.dropdown .dropdown-btn {
    width: 100%;
    padding: 5px 7px;
    border: none;
    cursor: pointer;
    background: none;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.dropdown .dropdown-btn span {
    margin: 0 6px;
    color: #6C6D75;
    font-weight: 500;
}

.dropdown .arrow {
    border: solid #666;
    border-width: 0 2px 2px 0;
    display: inline-block;
    padding: 3px;
    transform: rotate(45deg);
    transition: transform 0.3s;
}

.dropdown .dropdown-content {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    max-height: 400px;
    margin-top: 5px;
    z-index: 1;
    overflow-y: auto;
    border-radius: 4px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: none;
    background-color: #fff;
}

.dropdown .dropdown-item {
    padding: 8px;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
}

.dropdown .dropdown-item:hover {
    color: #FF546A;
    font-weight: 500;
}

.dropdown .dropdown-item.disabled {
    cursor: not-allowed;
    color: #cccccc;
    opacity: 0.7;
}

.dropdown .dropdown-item.disabled:hover {
    background: #fff;
}

.dropdown .dropdown-item .status-indicator {
    margin-left: 5px;
    color: #999;
}


.dropdown.active .dropdown-content {
    display: block;
}

.dropdown.active .arrow {
    transform: rotate(-135deg);
}

.doc {
    max-width: 900px;
    padding: 80px 20px 30px;
}
.doc .doc-header {
    padding: 30px 0;
}
.doc .content {

}