/* ===== 全局样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #FF6B9D;
    --primary-dark: #E55A87;
    --secondary-color: #FFB347;
    --text-color: #333;
    --text-light: #666;
    --bg-light: #FFF9FC;
    --bg-white: #FFFFFF;
    --border-color: #E8E8E8;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 16px rgba(255, 107, 157, 0.2);
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-color: #F5F5F5;
        --text-light: #AAAAAA;
        --bg-light: #1A1A1A;
        --bg-white: #2D2D2D;
        --border-color: #404040;
        --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-hover: 0 4px 16px rgba(255, 107, 157, 0.3);
    }
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    color: var(--text-color);
    background-color: var(--bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ===== 导航栏 ===== */
.navbar {
    background-color: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.heart-icon {
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    clip-path: path('M10 3.5L8.5 2C7 -1 2 1 2 5c0 3.5 5 9 8 12c3-3 8-8.5 8-12c0-4-5-6-6.5-3L10 3.5z');
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.3s ease;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 3px;
}

/* ===== Hero 区域 ===== */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 100px 0 80px;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.3rem;
    opacity: 0.95;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border-color: white;
}

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

/* ===== 通用 Section ===== */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    color: var(--text-color);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    margin: 15px auto 0;
    border-radius: 3px;
}

/* ===== 功能介绍 ===== */
.features {
    background-color: var(--bg-white);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

.feature-card:nth-child(2) .feature-icon { animation-delay: 0.5s; }
.feature-card:nth-child(3) .feature-icon { animation-delay: 1s; }
.feature-card:nth-child(4) .feature-icon { animation-delay: 1.5s; }
.feature-card:nth-child(5) .feature-icon { animation-delay: 2s; }
.feature-card:nth-child(6) .feature-icon { animation-delay: 2.5s; }

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    color: var(--text-color);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* ===== 应用信息 ===== */
.app-info {
    background-color: var(--bg-light);
}

.info-table {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--bg-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 1.2rem 2rem;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
}

.info-row:last-child {
    border-bottom: none;
}

.info-row:hover {
    background-color: var(--bg-light);
}

.info-label {
    font-weight: 600;
    color: var(--text-color);
}

.info-value {
    color: var(--text-light);
}

/* ===== FAQ ===== */
.faq {
    background-color: var(--bg-white);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--bg-light);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease;
}

.faq-question:hover {
    background-color: var(--bg-white);
}

.faq-question h3 {
    font-size: 1.1rem;
    color: var(--text-color);
    flex: 1;
    padding-right: 1rem;
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: bold;
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 1.5rem 1.5rem;
}

.faq-answer p {
    color: var(--text-light);
    line-height: 1.8;
}

.faq-answer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.faq-answer a:hover {
    text-decoration: underline;
}

/* ===== 联系我们 ===== */
.contact {
    background-color: var(--bg-light);
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
}

.contact-info p {
    font-size: 1.1rem;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 2rem;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.contact-method {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.contact-method:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.contact-method h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.contact-method p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 0;
    text-align: center;
}

/* ===== 页脚 ===== */
.footer {
    background-color: var(--bg-white);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.separator {
    color: var(--border-color);
}

.footer-copyright {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-white);
        flex-direction: column;
        padding: 0;
        box-shadow: var(--shadow);
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        visibility: hidden;
        transition: max-height 0.3s ease, opacity 0.3s ease, visibility 0.3s ease, padding 0.3s ease;
        gap: 0;
    }

    .nav-menu.active {
        max-height: 300px;
        padding: 1rem;
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li {
        padding: 0.5rem 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .info-row {
        flex-direction: column;
        gap: 0.3rem;
    }

    .feature-grid,
    .contact-methods {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 0 40px;
    }

    section {
        padding: 50px 0;
    }

    .feature-card,
    .contact-method {
        padding: 1.5rem;
    }

    .info-row {
        padding: 1rem 1.5rem;
    }

    .faq-question {
        padding: 1rem;
    }

    .faq-question h3 {
        font-size: 1rem;
    }
}

/* ===== 隐私政策和使用条款页面样式 ===== */
.policy-page {
    min-height: 100vh;
    background-color: var(--bg-light);
}

.policy-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 60px 0 40px;
    text-align: center;
}

.policy-header h1 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.policy-header .update-date {
    opacity: 0.9;
    font-size: 0.95rem;
}

.policy-content {
    max-width: 900px;
    margin: -30px auto 0;
    background-color: var(--bg-white);
    border-radius: 16px 16px 0 0;
    padding: 40px;
    box-shadow: var(--shadow);
}

.policy-content h2 {
    font-size: 1.6rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.policy-content h2:first-child {
    margin-top: 0;
}

.policy-content h3 {
    font-size: 1.2rem;
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    color: var(--text-color);
}

.policy-content p,
.policy-content ul {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.policy-content ul {
    padding-left: 2rem;
}

.policy-content li {
    margin-bottom: 0.5rem;
}

.policy-content a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.policy-content a:hover {
    text-decoration: underline;
}

.policy-back {
    text-align: center;
    padding: 2rem 0;
}

.policy-back a {
    display: inline-block;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.policy-back a:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

@media (max-width: 768px) {
    .policy-header {
        padding: 40px 0 30px;
    }

    .policy-header h1 {
        font-size: 1.8rem;
    }

    .policy-content {
        padding: 25px;
        margin-top: -20px;
    }

    .policy-content h2 {
        font-size: 1.4rem;
    }

    .policy-content h3 {
        font-size: 1.1rem;
    }
}