/* 变量和基本重置 */
:root {
    --primary-color: #16A085;        /* 绿松石 */
    --secondary-color: #F4D03F;      /* 金色 */
    --gradient-start: #16A085;
    --gradient-end: #F4D03F;
    --dark-color: #2C3E50;           /* 深蓝灰 */
    --light-color: #ECF0F1;
    --text-color: #333333;
    --card-bg: #FFFFFF;
    --background: #f9f9f9;
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

h1, h2, h3, h4 {
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
}

h1 {
    font-size: 2.8rem;
    background: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-fill-color: transparent;
}

h2 {
    font-size: 2.2rem;
    text-align: center;
    margin-bottom: 2.5rem;
    position: relative;
}

h2:after {
    content: '';
    position: absolute;
    width: 80px;
    height: 3px;
    background: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

h3 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
}

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

a:hover {
    color: var(--secondary-color);
}

ul {
    list-style: none;
}

section {
    padding: 5rem 0;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
    color: white;
    box-shadow: 0 4px 15px rgba(22, 160, 133, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(22, 160, 133, 0.4);
    color: white;
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

.btn-nav {
    padding: 8px 20px;
    font-size: 0.9rem;
}

.btn-large {
    padding: 15px 35px;
    font-size: 1.1rem;
}

/* 页眉和导航 */
header {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

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

.logo-icon {
    margin-right: 10px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-color);
}

.main-nav ul {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.main-nav a:not(.btn) {
    color: var(--text-color);
    font-weight: 500;
    position: relative;
}

.main-nav a:not(.btn)::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
    transition: var(--transition);
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 24px;
    position: relative;
}

.menu-toggle span {
    display: block;
    position: absolute;
    height: 3px;
    width: 100%;
    background: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
    border-radius: 3px;
    opacity: 1;
    transform: rotate(0deg);
    transition: var(--transition);
}

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

.menu-toggle span:nth-child(2) {
    top: 10px;
}

.menu-toggle span:nth-child(3) {
    top: 20px;
}

.menu-toggle.active span:nth-child(1) {
    top: 10px;
    transform: rotate(135deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    top: 10px;
    transform: rotate(-135deg);
}

/* 英雄区块 */
.hero {
    background: linear-gradient(135deg, rgba(22, 160, 133, 0.9), rgba(244, 208, 63, 0.9)), url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="%23333" opacity="0.05"/><path d="M0 50 L100 50 M50 0 L50 100" stroke="%23fff" stroke-width="0.5" opacity="0.2"/></svg>');
    background-size: cover;
    background-position: center;
    padding: 10rem 0 6rem;
    color: white;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    -webkit-text-fill-color: white;
    text-fill-color: white;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 特点部分 */
.features {
    background-color: white;
    position: relative;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--light-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
}

/* 使用方法部分 */
.how-it-works {
    background-color: var(--background);
}

.steps {
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: flex;
    margin-bottom: 3rem;
    position: relative;
}

.step:last-child {
    margin-bottom: 0;
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.5rem;
    margin-right: 1.5rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 50px;
    left: 25px;
    width: 2px;
    height: calc(100% - 25px);
    background: linear-gradient(to bottom, var(--gradient-start), var(--gradient-end));
    opacity: 0.3;
}

.cta-center {
    text-align: center;
    margin-top: 3rem;
}

/* FAQ部分 */
.faq {
    background-color: white;
}

.faq-items {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-question {
    padding: 1.2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.faq-question h3 {
    margin: 0;
    font-size: 1.1rem;
}

.faq-toggle {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: bold;
    transition: var(--transition);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
    padding: 0 1.2rem;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 1rem 1.2rem;
}

/* CTA部分 */
.cta {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    text-align: center;
    padding: 5rem 0;
}

.cta h2 {
    color: white;
}

.cta h2:after {
    background: white;
}

.cta p {
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

.cta .btn-primary:hover {
    background: var(--light-color);
    color: var(--dark-color);
}

/* 页脚 */
footer {
    background-color: var(--dark-color);
    color: white;
    padding: 4rem 0 1rem;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 3rem;
}

.footer-logo {
    margin-bottom: 1.5rem;
}

.footer-logo .logo-text {
    color: white;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 3rem;
}

.footer-column h4 {
    font-size: 1.1rem;
    margin-bottom: 1.2rem;
    color: white;
    position: relative;
}

.footer-column h4:after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 2px;
    background: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
}

.footer-column ul li {
    margin-bottom: 0.7rem;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-column a:hover {
    color: white;
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

/* 响应式设计 */
@media (max-width: 992px) {
    html {
        font-size: 15px;
    }
    
    h1 {
        font-size: 2.4rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .main-nav {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 100%;
        height: auto;
        background: white;
        flex-direction: column;
        box-shadow: var(--shadow);
        transition: var(--transition);
        opacity: 0;
    }
    
    .main-nav.active {
        right: 0;
        opacity: 1;
    }
    
    .main-nav ul {
        flex-direction: column;
        padding: 2rem 0;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
    
    .step-number {
        margin: 0 auto 1rem;
    }
    
    .step:not(:last-child)::after {
        left: 50%;
        top: 50px;
        height: calc(100% - 30px);
        width: 2px;
    }
    
    .feature-card {
        padding: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 2rem;
    }
    
    .footer-column h4:after {
        left: 0;
        transform: none;
    }
}

@media (max-width: 576px) {
    section {
        padding: 4rem 0;
    }
    
    .container {
        width: 95%;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.6rem;
    }
    
    .hero {
        padding: 8rem 0 4rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 100%;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
}