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

:root {
    --primary-color: #4a6cf7;
    --secondary-color: #6c63ff;
    --accent-color: #ff6b6b;
    --dark-color: #2d3436;
    --light-color: #f8f9fa;
    --text-color: #333;
    --text-light: #6c757d;
    --border-radius: 8px;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #ffffff;
    overflow-x: hidden;
}

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 16px;
}

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

.btn-primary:hover {
    background-color: #3a5bd9;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74, 108, 247, 0.3);
}

.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;
    transform: translateY(-2px);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.nav-brand h2 {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.5rem;
}

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

.nav-link {
    color: var(--text-color);
    font-weight: 500;
    text-decoration: none;
    position: relative;
    transition: var(--transition);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 3px 0;
    transition: var(--transition);
}

/* 主页横幅 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f5f7ff 0%, #e4e8ff 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 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="none"/><circle cx="50" cy="50" r="40" fill="rgba(74, 108, 247, 0.05)"/></svg>');
    background-size: 100px 100px;
    opacity: 0.5;
    z-index: 0;
}

.hero .container {
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
    padding-right: 40px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 15px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 30px;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-mockup {
    width: 300px;
    height: 500px;
    background-color: white;
    border-radius: 20px;
    box-shadow: var(--box-shadow);
    overflow: hidden;
    position: relative;
    transform: perspective(1000px) rotateY(-10deg);
    transition: var(--transition);
}

.app-mockup:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.mockup-screen {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.mockup-header {
    display: flex;
    justify-content: flex-start;
    padding: 10px;
    background-color: #f5f5f5;
}

.mockup-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 8px;
}

.mockup-dot:nth-child(1) {
    background-color: #ff5f56;
}

.mockup-dot:nth-child(2) {
    background-color: #ffbd2e;
}

.mockup-dot:nth-child(3) {
    background-color: #27c93f;
}

.mockup-content {
    flex: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.answer-item {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.answer-item:hover {
    background-color: #e9ecef;
    transform: translateX(5px);
}

.question-num {
    font-weight: 700;
    color: var(--primary-color);
    margin-right: 10px;
    font-size: 1.2rem;
}

.answer-text {
    font-weight: 600;
    color: var(--dark-color);
    font-size: 1.1rem;
}

/* 功能特点 */
.features {
    padding: 80px 0;
    background-color: white;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 15px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: var(--transition);
    border: 1px solid #f0f0f0;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--box-shadow);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background-color: rgba(74, 108, 247, 0.1);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 20px;
}

.feature-icon i {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 15px;
}

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

/* 使用教程 */
.tutorial {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.tutorial-steps {
    display: flex;
    justify-content: space-between;
    margin-bottom: 60px;
    position: relative;
}

.tutorial-steps::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #e9ecef;
    z-index: 0;
}

.step {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 1;
    padding: 0 15px;
}

.step-number {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 20px;
    position: relative;
}

.step h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 15px;
}

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

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

.tutorial-image img {
    max-width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* 下载区域 */
.download {
    padding: 80px 0;
    background-color: white;
}

.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.download-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid #f0f0f0;
    position: relative;
}

.download-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--box-shadow);
}

.download-card.featured {
    border: 2px solid var(--primary-color);
    transform: scale(1.03);
}

.featured-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--accent-color);
    color: white;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    z-index: 1;
}

.download-header {
    padding: 25px;
    background-color: #f8f9fa;
    text-align: center;
    border-bottom: 1px solid #e9ecef;
}

.download-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 5px;
}

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

.download-features {
    padding: 25px;
}

.download-features ul {
    list-style: none;
}

.download-features li {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    color: var(--text-light);
}

.download-features i {
    margin-right: 10px;
    color: var(--primary-color);
}

.download-features .fa-times {
    color: var(--text-light);
}

.download-footer {
    padding: 20px 25px;
    background-color: #f8f9fa;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

/* 隐私政策 */
.privacy {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.privacy-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.privacy-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: var(--transition);
    border: 1px solid #f0f0f0;
}

.privacy-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--box-shadow);
}

.privacy-icon {
    width: 70px;
    height: 70px;
    background-color: rgba(74, 108, 247, 0.1);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 20px;
}

.privacy-icon i {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.privacy-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 15px;
}

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

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

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo h2 {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 10px;
}

.footer-logo p {
    color: #b2b2b2;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.footer-column h3 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--primary-color);
}

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

.footer-column li {
    margin-bottom: 10px;
}

.footer-column a {
    color: #b2b2b2;
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #444;
    color: #b2b2b2;
}

/* 弹窗 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow: auto;
}

.modal-content {
    background-color: white;
    margin: 15% auto;
    padding: 30px;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: var(--box-shadow);
}

.close {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    color: #aaa;
}

.close:hover {
    color: var(--dark-color);
}

.modal h3 {
    margin-bottom: 20px;
    color: var(--dark-color);
}

.modal p {
    margin-bottom: 20px;
    color: var(--text-light);
}

.modal-buttons {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
}

/* 指南部分样式 - 简化版 */
.guide-section {
    margin-bottom: 50px;
    padding: 25px 30px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border-left: 4px solid #4a6fdc;
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.guide-section.visible {
    opacity: 1;
    transform: translateY(0);
}

.guide-section:hover {
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.08);
}

.guide-section h3 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.6rem;
    font-weight: 600;
    display: flex;
    align-items: center;
}

.guide-section h3::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 24px;
    background: linear-gradient(to bottom, #4a6fdc, #6a8aef);
    margin-right: 12px;
    border-radius: 4px;
}

.guide-section h4 {
    color: #34495e;
    margin-bottom: 12px;
    font-size: 1.15rem;
    font-weight: 600;
    display: flex;
    align-items: center;
}

.guide-section h4 i {
    margin-right: 10px;
    color: #4a6fdc;
    font-size: 1.1em;
}

.guide-section p {
    margin-bottom: 15px;
    line-height: 1.7;
    color: #555;
}

.guide-section ul {
    margin-bottom: 20px;
    padding-left: 20px;
}

.guide-section li {
    margin-bottom: 8px;
    line-height: 1.6;
    color: #555;
    position: relative;
    list-style-type: none;
    padding-left: 22px;
}

.guide-section li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #4a6fdc;
    font-weight: bold;
    font-size: 1.2em;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.feature-item {
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.feature-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.feature-item:nth-child(1) { transition-delay: 0.1s; }
.feature-item:nth-child(2) { transition-delay: 0.2s; }
.feature-item:nth-child(3) { transition-delay: 0.3s; }
.feature-item:nth-child(4) { transition-delay: 0.4s; }

.feature-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.feature-item h4 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 1.15rem;
    font-weight: 600;
    display: flex;
    align-items: center;
}

.feature-item h4 i {
    margin-right: 10px;
    color: #4a6fdc;
    font-size: 1.1em;
}

.feature-item ul {
    margin: 0;
    padding-left: 20px;
}

.feature-item li {
    margin-bottom: 8px;
    line-height: 1.6;
    color: #555;
    position: relative;
    list-style-type: none;
    padding-left: 22px;
}

.feature-item li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #4a6fdc;
    font-weight: bold;
    font-size: 1.2em;
}

.faq-list {
    margin-top: 20px;
}

.faq-item {
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 15px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.faq-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.faq-item:nth-child(1) { transition-delay: 0.1s; }
.faq-item:nth-child(2) { transition-delay: 0.2s; }
.faq-item:nth-child(3) { transition-delay: 0.3s; }
.faq-item:nth-child(4) { transition-delay: 0.4s; }
.faq-item:nth-child(5) { transition-delay: 0.5s; }

.faq-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.faq-item h4 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 1.15rem;
    font-weight: 600;
    display: flex;
    align-items: center;
}

.faq-item h4 i {
    margin-right: 10px;
    color: #4a6fdc;
    font-size: 1.1em;
}

.faq-item p {
    margin: 0;
    line-height: 1.6;
    color: #555;
    padding-left: 26px;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.contact-info-item {
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.contact-info-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.contact-info-item:nth-child(1) { transition-delay: 0.1s; }
.contact-info-item:nth-child(2) { transition-delay: 0.2s; }
.contact-info-item:nth-child(3) { transition-delay: 0.3s; }

.contact-info-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.contact-info-item h4 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 1.15rem;
    font-weight: 600;
}

.contact-info-item p {
    margin: 0;
    line-height: 1.6;
    color: #555;
}

.contact-info-item i {
    font-size: 2rem;
    color: #4a6fdc;
    margin-bottom: 15px;
}

.guide-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.guide-item {
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    align-items: center;
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.guide-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.guide-item:nth-child(1) { transition-delay: 0.1s; }
.guide-item:nth-child(2) { transition-delay: 0.2s; }
.guide-item:nth-child(3) { transition-delay: 0.3s; }

.guide-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.guide-number {
    background: #4a6fdc;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    margin-right: 15px;
    flex-shrink: 0;
    font-size: 1rem;
}

.guide-item p {
    margin: 0;
    line-height: 1.5;
    color: #444;
    font-size: 1rem;
}

/* 指南进度指示器 */
.guide-progress {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 15px;
    opacity: 0.8;
}

.guide-progress-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: rgba(74, 111, 220, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.guide-progress-dot.active {
    background-color: #4a6fdc;
    transform: scale(1.2);
}

.guide-progress-dot:hover {
    background-color: rgba(74, 111, 220, 0.7);
    transform: scale(1.1);
}

.guide-progress-dot::after {
    content: attr(data-title);
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 4px 8px;
    border-radius: 3px;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.guide-progress-dot:hover::after {
    opacity: 1;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    background: #4a6fdc;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    box-shadow: 0 3px 10px rgba(74, 111, 220, 0.2);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 0.8;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    opacity: 1;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(74, 111, 220, 0.3);
}

.back-to-top:active {
    transform: translateY(-1px);
}

/* 打印样式 */
@media print {
    header, .hero, .download, .footer {
        display: none;
    }
    
    .tutorial {
        margin-top: 0;
    }
    
    .guide-section {
        break-inside: avoid;
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #e0e0e0;
        margin-bottom: 20px;
    }
    
    .feature-item, .faq-item {
        break-inside: avoid;
        page-break-inside: avoid;
    }
    
    .back-to-top, .guide-progress {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    h2 {
        font-size: 18pt;
        page-break-after: avoid;
    }
    
    h3 {
        font-size: 14pt;
        page-break-after: avoid;
    }
}
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        padding-right: 0;
        margin-bottom: 40px;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .guide-list {
        grid-template-columns: 1fr;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
    }
    
    .faq-list {
        grid-template-columns: 1fr;
    }
    
    .guide-progress {
        right: 15px;
    }
    
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 20px 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }
    
    .hamburger.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .tutorial-steps {
        flex-direction: column;
    }
    
    .tutorial-steps::before {
        display: none;
    }
    
    .step {
        margin-bottom: 30px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .guide-section {
        padding: 30px 20px;
        margin-bottom: 30px;
    }
    
    .guide-section h3 {
        font-size: 1.8rem;
    }
    
    .guide-section h4 {
        font-size: 1.3rem;
    }
    
    .feature-item,
    .faq-item,
    .contact-info-item {
        padding: 15px;
    }
    
    .guide-progress {
        display: none;
    }
    
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .features-grid,
    .privacy-content {
        grid-template-columns: 1fr;
    }
    
    .download-options {
        grid-template-columns: 1fr;
    }
    
    .download-card.featured {
        transform: scale(1);
    }
}