body { padding: 0; overflow-x: hidden; }
.left-aligned { margin-left: auto; }
.bg-dark { background-color: #343a40 !important; }
.bg-hero { background-color: #45b06cff; }

/* CALLOUT */
.bd-callout { padding:1.25rem; margin-top:1.25rem; margin-bottom:1.25rem; border:1px solid #e9ecef; border-left-width:.25rem; border-radius:.25rem }
.bd-callout h4 { margin-bottom: 1.25rem }
.bd-callout p:last-child { margin-bottom:0 }
.bd-callout code { border-radius:.25rem }
.bd-callout+.bd-callout { margin-top:-.25rem }
.bd-callout-info { border-left-color:#5bc0de }
.bd-callout-warning { border-left-color:#f0ad4e }
.bd-callout-danger { border-left-color:#d9534f }

/* Member Cards */
.member-card {
    width: 280px;
    margin: 15px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border-radius: 10px;
    overflow: hidden;
    background: #fff;
}

.member-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0,0,0,0.2);
}

.card-img-top {
    width: 100%;
    height: 280px;
    object-fit: cover;
    border-radius: 10px 10px 0 0;
}

.card-back-decoration {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 80px;
    height: 80px;
    background: rgba(69, 176, 108, 0.2);
    border-radius: 50%;
}

/* footer */
footer a { color: white; font-weight: bold; text-decoration: none; }
footer a:hover { color: white; text-decoration: underline; }


.page_container {
    /* background-color: #f4d4dd; */
    max-width: 100vw !important;
    min-height: 100vh;
}

/* =============================
   iGEM Top-tier Navigation - 浅绿环保主题
   ============================= */
:root {
    --igem-primary: #5ec081; /* 清新主绿 */
    --igem-primary-600: #3ea166; /* 主色加深 */
    --igem-accent: #cfead9; /* 浅绿点缀 */
    --igem-surface: rgba(223, 244, 231, 0.75); /* 浅绿毛玻璃 */
    --igem-surface-opaque: rgba(207, 234, 217, 0.95); /* 滚动后更实 */
    --igem-border: rgba(62, 161, 102, 0.25); /* 绿色边线 */
    --igem-white: #ffffff;
    --igem-text: #1a4d2e; /* 深绿文字 */
    --igem-muted: rgba(26, 77, 46, 0.75); /* 柔和深绿 */
}

/* layout spacing for fixed navbar */
body { padding-top: 80px; }

.navbar-igem {
    background: linear-gradient(180deg, rgba(223, 244, 231, 0.85) 0%, rgba(223, 244, 231, 0.65) 100%);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--igem-border);
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    height: 80px;
    transform: translateY(0);
}

.navbar-igem.navbar-hidden {
    transform: translateY(-100%);
}

.navbar-igem.navbar-visible {
    background: linear-gradient(180deg, var(--igem-surface-opaque) 0%, rgba(207, 234, 217, 0.92) 100%);
    box-shadow: 0 8px 32px rgba(94, 192, 129, 0.15), 0 2px 8px rgba(94, 192, 129, 0.1);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.navbar-igem .container { align-items: center; }

.brand-igem {
    font-weight: 800;
    letter-spacing: 0.4px;
    color: var(--igem-text) !important;
    position: relative;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.brand-igem::after {
    content: "";
    position: absolute;
    left: -8px;
    bottom: -6px;
    width: calc(100% + 16px);
    height: 10px;
    background: radial-gradient(60% 100% at 50% 100%, rgba(94,192,129,0.4) 0%, rgba(94,192,129,0) 100%);
    filter: blur(6px);
    opacity: 0.8;
    z-index: -1;
    transition: opacity 0.3s ease;
}

.brand-igem:hover::after {
    opacity: 1;
}

.navbar-igem .navbar-nav .nav-item { margin: 0 2px; }

.link-igem {
    color: var(--igem-muted) !important;
    padding: 0.5rem 0.85rem !important;
    border-radius: 10px;
    position: relative;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.link-igem::after {
    content: "";
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: 6px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--igem-primary), transparent);
    transform: scaleX(0);
    transform-origin: 50% 50%;
    transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border-radius: 1px;
}

.link-igem:hover, .link-igem:focus { color: var(--igem-text) !important; }
.link-igem:hover::after, .link-igem:focus::after { transform: scaleX(1); }

/* Dropdown (mega) styling */
.navbar-igem .dropdown-menu {
    border: 1px solid var(--igem-border);
    border-radius: 14px;
    background: linear-gradient(180deg, rgba(255,255,255,0.96) 0%, rgba(255,255,255,0.92) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 20px 40px rgba(62,161,102,0.15);
    padding: 10px;
    min-width: 220px;
    margin-top: 4px;
    z-index: 1000;
}

.navbar-igem .dropdown-item {
    color: var(--igem-text);
    border-radius: 8px;
    padding: 8px 12px;
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
}

.navbar-igem .dropdown-item:hover, .navbar-igem .dropdown-item:focus {
    color: var(--igem-text);
    background: rgba(94,192,129,0.18);
    transform: translateX(2px);
}

/* 优化的悬浮下拉菜单 */
@media (min-width: 992px) {
    /* 主要的hover效果 */
    .navbar-igem .dropdown:hover > .dropdown-menu { 
        display: block;
        opacity: 1;
        visibility: visible;
        transform: translateY(0) scale(1);
    }
    
    /* 增强dropdown容器的hover区域 */
    .navbar-igem .dropdown {
        position: relative;
    }
    
    /* 下拉菜单默认隐藏状态 */
    .navbar-igem .dropdown-menu {
        opacity: 0;
        visibility: hidden;
        transform: translateY(8px) scale(0.98);
        transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        display: block !important; /* 覆盖Bootstrap默认 */
        pointer-events: none;
    }
    
    /* hover时的可见状态 */
    .navbar-igem .dropdown:hover .dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0) scale(1);
        pointer-events: auto;
    }
    
    /* 增加鼠标移动的缓冲区域 */
    .navbar-igem .dropdown::after {
        content: "";
        position: absolute;
        top: 100%;
        left: -10px;
        right: -10px;
        height: 20px;
        background: transparent;
        z-index: 999;
    }
    
    /* 悬浮时主链接保持激活状态 */
    .navbar-igem .dropdown:hover > .link-igem {
        color: var(--igem-text) !important;
    }
    
    .navbar-igem .dropdown:hover > .link-igem::after {
        transform: scaleX(1);
    }
}

/* 移动端下拉菜单优化 */
@media (max-width: 991px) {
    .navbar-igem .dropdown-menu {
        opacity: 1 !important;
        visibility: visible !important;
        transform: none !important;
        display: none !important;
        pointer-events: auto !important;
        position: static;
        border: none;
        box-shadow: none;
        background: rgba(255, 255, 255, 0.95);
        margin: 8px 0;
        border-radius: 8px;
    }
    
    /* 点击展开移动端菜单 */
    .navbar-igem .dropdown.show .dropdown-menu {
        display: block !important;
    }
    
    /* 移动端链接样式 */
    .navbar-igem .dropdown-item {
        padding: 12px 20px;
        font-size: 0.95rem;
    }
}

/* Toggler icon for custom theme */
.navbar-igem .navbar-toggler { border-color: rgba(26,77,46,0.3); }
.navbar-igem .navbar-toggler:focus { box-shadow: 0 0 0 0.15rem rgba(94,192,129,0.35); }
.navbar-igem .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(26,77,46,0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* refined container width on very large screens */
@media (min-width: 1400px) {
    .navbar-igem .container { max-width: 1200px; }
}