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

:root {
    --primary-color: #D32F2F;
    --primary-dark: #B71C1C;
    --secondary-color: #4CAF50;
    --text-dark: #212121;
    --text-light: #666666;
    --bg-light: #FFF8F0;
    --bg-white: #FFFFFF;
    --border-color: #E8D5C4;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

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

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

/* 导航栏 */
.navbar {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
}

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

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

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

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: all 0.3s;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #FFF8F0 0%, #FFFFFF 100%);
    padding: 80px 0;
    min-height: 600px;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--primary-color);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

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

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

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

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

/* 手机预览 */
.phone-mockup {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
}

.phone-screen {
    background: var(--bg-white);
    border-radius: 20px;
    padding: 20px;
    box-shadow: var(--shadow-lg);
    border: 8px solid #1a1a1a;
}

.app-preview {
    background: var(--bg-light);
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    padding: 20px;
}

.preview-header {
    text-align: center;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
}

.preview-date {
    text-align: center;
    font-size: 1rem;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.preview-content {
    display: flex;
    gap: 10px;
}

.preview-yi,
.preview-ji {
    flex: 1;
    padding: 10px;
    border-radius: 4px;
    font-size: 0.9rem;
}

.preview-yi {
    background: rgba(76, 175, 80, 0.1);
    color: var(--secondary-color);
}

.preview-ji {
    background: rgba(33, 33, 33, 0.1);
    color: var(--text-dark);
}

/* 功能预览 */
.features-preview {
    padding: 80px 0;
    background: var(--bg-white);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    color: var(--text-dark);
    margin-bottom: 3rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.feature-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    border: 2px solid var(--border-color);
    transition: all 0.3s;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.6;
}

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

/* 应用特色 */
.highlights {
    padding: 80px 0;
    background: var(--bg-light);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.highlight-item {
    text-align: center;
    padding: 2rem;
}

.highlight-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.highlight-item h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.highlight-item p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 下载区域 */
.download {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    text-align: center;
}

.download .section-title,
.download .section-subtitle {
    color: white;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 3rem 0;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1.5rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s;
    min-width: 200px;
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.download-icon {
    font-size: 2rem;
}

.download-text {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.download-label {
    font-size: 1.1rem;
    font-weight: 600;
}

.download-sub {
    font-size: 0.9rem;
    opacity: 0.8;
}

.download-note {
    margin-top: 2rem;
    opacity: 0.9;
    font-size: 0.9rem;
}

/* 页脚 */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

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

/* 内容页面样式 */
.content-page {
    padding: 40px 0 80px;
    background: var(--bg-white);
    min-height: 60vh;
}

.content-page h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.content-page h2 {
    font-size: 2rem;
    color: var(--text-dark);
    margin: 2rem 0 1rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.content-page h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin: 1.5rem 0 1rem;
}

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

.content-page ul,
.content-page ol {
    margin: 1rem 0 1rem 2rem;
    color: var(--text-light);
    line-height: 1.8;
}

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

.content-card {
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
}

.faq-item {
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    cursor: pointer;
    transition: all 0.3s;
}

.faq-item:hover {
    border-color: var(--primary-color);
}

.faq-question {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    color: var(--text-light);
    line-height: 1.8;
    margin-top: 1rem;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

.faq-item.active .faq-question::after {
    content: '−';
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* 联系表单 */
.contact-form {
    max-width: 600px;
    margin: 2rem auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    width: 100%;
    padding: 14px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.form-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}