/* ========================================
   土豆财富量化交易 - 公共样式
   商务风格 · 专业设计
   ======================================== */

/* CSS变量定义 - 商务配色 */
:root {
    --primary-color: #2563EB;      /* 专业蓝 */
    --secondary-color: #1E40AF;    /* 深蓝 */
    --accent-color: #34D399;       /* 翠绿 */
    --background-color: #FFFFFF;   /* 白色 */
    --text-color: #0F172A;         /* 深色文字 */
    --text-muted: #64748B;         /* 次要文字 */
    --light-gray: #F8FAFC;         /* 浅灰背景 */
    --border-color: #E2E8F0;       /* 边框色 */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 20px rgba(0,0,0,0.05);
    --shadow-lg: 0 20px 40px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text-color);
    background-color: var(--background-color);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

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

/* ========================================
   导航栏样式
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: transparent;
    transition: var(--transition);
    padding: 15px 0;
}

.navbar.scrolled {
    background-color: rgba(255,255,255,0.95);
    box-shadow: var(--shadow);
}

.navbar.scrolled .logo {
    color: var(--text-color);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    color: var(--background-color);
    transition: var(--transition);
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-text {
    color: white;
}

.navbar.scrolled .logo-text {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-menu > li {
    display: flex;
    align-items: center;
}

.nav-menu a {
    color: var(--background-color);
    font-size: 16px;
    padding: 5px 0;
    position: relative;
}

.navbar.scrolled .nav-menu a {
    color: var(--text-color);
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.user-menu {
    position: relative;
}

.user-menu > a {
    display: block;
    line-height: normal;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 136px;
    padding: 8px;
    margin: 0;
    list-style: none;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: var(--transition);
    z-index: 20;
}

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

.user-dropdown a,
.navbar.scrolled .user-dropdown a {
    display: block;
    padding: 10px 12px;
    border-radius: 6px;
    color: var(--text-color);
    white-space: nowrap;
}

.user-dropdown a:hover {
    background: #EFF6FF;
    color: var(--primary-color);
}

.user-dropdown a::after {
    display: none;
}

/* 汉堡菜单（移动端） */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--background-color);
    transition: var(--transition);
}

.navbar.scrolled .hamburger span {
    background-color: var(--text-color);
}

/* ========================================
   页面标题区
   ======================================== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--background-color);
    text-align: center;
    padding: 120px 20px 60px;
}

.page-header h1 {
    font-size: 36px;
    margin-bottom: 10px;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
}

/* ========================================
   按钮样式
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(37, 99, 235, 0.4);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

/* ========================================
   卡片样式
   ======================================== */
.card {
    background-color: var(--background-color);
    border-radius: 10px;
    box-shadow: var(--shadow);
    padding: 30px;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

/* ========================================
   底部样式
   ======================================== */
.footer {
    background: #0F172A;
    color: white;
    padding: 80px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo .logo-icon {
    width: 40px;
    height: 40px;
}

.footer-logo span {
    font-size: 20px;
    font-weight: 600;
}

.footer-tagline {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 8px;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
}

.footer-links h4,
.footer-contact h4 {
    font-size: 16px;
    font-weight: 600;
    color: white;
    margin-bottom: 24px;
}

.footer-links ul,
.footer-contact ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #3B82F6;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

.footer-contact svg {
    width: 18px;
    height: 18px;
    stroke: #3B82F6;
    flex-shrink: 0;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.4);
    margin: 0;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.4);
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-legal a:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--background-color);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: var(--shadow);
        display: none;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu a {
        color: var(--text-color);
    }

    .user-dropdown {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: 0;
        padding: 6px 0 0 12px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-logo {
        justify-content: center;
    }

    .footer-contact li {
        justify-content: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .page-header h1 {
        font-size: 28px;
    }

    .page-header p {
        font-size: 16px;
    }
}