* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #1a365d;
    --accent-blue: #3182ce;
    --light-blue: #e6f3ff;
    --gold: #d69e2e;
    --gray-50: #f7fafc;
    --gray-100: #edf2f7;
    --gray-600: #718096;
    --gray-800: #2d3748;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #1a365d 0%, #3182ce 100%);
    --shadow-soft: 0 10px 25px rgba(26, 54, 93, 0.1);
    --shadow-strong: 0 20px 40px rgba(26, 54, 93, 0.15);
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(26, 54, 93, 0.1);
    transition: all 0.3s ease;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    font-family: 'Playfair Display', serif;
    font-size: 28px;
    font-weight: 600;
    color: var(--primary-blue);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: var(--accent-blue);
}

/* 用户下拉菜单 */
.user-dropdown {
    position: relative;
}

.user-menu-trigger {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.user-menu-trigger:hover {
    background: var(--light-blue);
    color: var(--primary-blue) !important;
}

.user-email {
    font-weight: 600;
    color: var(--primary-blue);
}

.dropdown-arrow {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.user-dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.user-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 8px;
    box-shadow: var(--shadow-strong);
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1001;
}

.user-dropdown:hover .user-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-dropdown-menu a {
    display: block;
    padding: 12px 16px;
    color: var(--gray-600);
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}

.user-dropdown-menu a:hover {
    background: var(--light-blue);
    color: var(--primary-blue);
}

.user-dropdown-menu hr {
    margin: 8px 0;
    border: none;
    border-top: 1px solid var(--gray-100);
}

.btn-primary {
    background: var(--gradient);
    color: #ffffff !important;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0f2a44 0%, #2c5aa0 100%);
    color: #ffffff !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-strong);
}

.btn-secondary {
    background: transparent;
    color: var(--accent-blue);
    border: 2px solid var(--accent-blue);
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-secondary:hover {
    background: var(--light-blue);
    color: var(--primary-blue);
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background: var(--primary-blue);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    display: block;
    margin-bottom: 10px;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 30px;
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    /* 移动端可以添加汉堡菜单，暂时隐藏 */
    .mobile-menu-toggle {
        display: block;
        background: none;
        border: none;
        font-size: 24px;
        color: var(--primary-blue);
        cursor: pointer;
    }
    
    /* 如果需要显示移动端菜单 */
    .nav-menu.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        border-top: 1px solid var(--gray-100);
        box-shadow: var(--shadow-strong);
        padding: 20px;
        gap: 15px;
    }
    
    .user-dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        margin-top: 10px;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}