/* ===== 基础变量与重置 ===== */
:root {
    --primary: #4a6cf7;
    --primary-light: #6a8aff;
    --primary-dark: #2a4bd4;
    --secondary: #8e6cf7;
    --accent: #00c9ff;
    --light: #f8faff;
    --light-gray: #f0f4ff;
    --dark: #1e2a4a;
    --text: #4a5568;
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
    --gradient-light: linear-gradient(135deg, var(--primary-light), var(--accent));
    --shadow: 0 10px 30px rgba(74, 108, 247, 0.15);
    --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--light);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--dark);
}

p {
    margin-bottom: 1rem;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 100px 0;
    position: relative;
}

.section-title {
    text-align: center;
    margin-bottom: 70px;
    position: relative;
}

.section-title h2 {
    font-size: 2.8rem;
    color: var(--dark);
    display: inline-block;
    position: relative;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.section-title p {
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.2rem;
    color: var(--text);
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 32px;
    background: var(--gradient);
    color: white;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.7s ease;
}

.btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(74, 108, 247, 0.3);
}

.btn:hover::before {
    left: 100%;
}

/* ===== 导航栏样式 ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    padding: 10px 0;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    position: relative;
    animation: logoAnimation 4s infinite alternate;
}

@keyframes logoAnimation {
    0% {
        text-shadow: 0 0 10px rgba(74, 108, 247, 0.3);
        transform: scale(1);
    }
    25% {
        text-shadow: 0 0 15px rgba(74, 108, 247, 0.5), 0 0 25px rgba(142, 108, 247, 0.3);
        transform: scale(1.02);
    }
    50% {
        text-shadow: 0 0 20px rgba(74, 108, 247, 0.7), 0 0 30px rgba(142, 108, 247, 0.4);
        transform: scale(1);
    }
    75% {
        text-shadow: 0 0 15px rgba(74, 108, 247, 0.5), 0 0 25px rgba(142, 108, 247, 0.3);
        transform: scale(1.02);
    }
    100% {
        text-shadow: 0 0 10px rgba(74, 108, 247, 0.3);
        transform: scale(1);
    }
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
    position: relative;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    padding: 5px 0;
}

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

.nav-links a:hover {
    color: var(--primary);
}

.nav-links a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    cursor: pointer;
    width: 30px;
    height: 20px;
    position: relative;
}

.hamburger span {
    display: block;
    position: absolute;
    height: 3px;
    width: 100%;
    background: var(--dark);
    border-radius: 3px;
    opacity: 1;
    left: 0;
    transform: rotate(0deg);
    transition: var(--transition);
}

.hamburger span:nth-child(1) {
    top: 0;
}

.hamburger span:nth-child(2) {
    top: 8px;
}

.hamburger span:nth-child(3) {
    top: 16px;
}

.hamburger.active span:nth-child(1) {
    top: 8px;
    transform: rotate(135deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
    left: -30px;
}

.hamburger.active span:nth-child(3) {
    top: 8px;
    transform: rotate(-135deg);
}

/* ===== 底部样式 ===== */
footer {
    background: var(--dark);
    color: white;
    padding: 80px 0 20px;
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(74, 108, 247, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(142, 108, 247, 0.1) 0%, transparent 50%);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
    position: relative;
    z-index: 1;
}

.footer-column h3 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    position: relative;
    display: inline-block;
    color: white;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--gradient);
}

.footer-column p, .footer-column a {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 12px;
    display: block;
    text-decoration: none;
    transition: var(--transition);
}

.footer-column a:hover {
    color: white;
    transform: translateX(5px);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: var(--transition);
    color: white;
    font-size: 1.2rem;
}

.social-links a:hover {
    background: var(--gradient);
    transform: translateY(-5px);
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
    position: relative;
    z-index: 1;
}

/* ===== 动画定义 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0% {
        transform: translate(0, 0) rotate(0deg);
    }
    33% {
        transform: translate(30px, -50px) rotate(120deg);
    }
    66% {
        transform: translate(-20px, 20px) rotate(240deg);
    }
    100% {
        transform: translate(0, 0) rotate(360deg);
    }
}

/* ===== 响应式设计 - 公共部分 ===== */
@media (max-width: 768px) {
    .navbar {
        padding: 15px 0;
    }
    
    .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: white;
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 50px;
        transition: var(--transition);
        box-shadow: var(--shadow);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-links li {
        margin: 20px 0;
    }
    
    .hamburger {
        display: block;
    }
    
    .section {
        padding: 80px 0;
    }
    
    .section-title h2 {
        font-size: 2.2rem;
    }
}

@media (max-width: 576px) {
    .footer-content {
        grid-template-columns: 1fr;
    }
}