@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&display=swap');

:root {
    --primary: #2d5af0;
    --primary-light: #5b7ff5;
    --primary-dark: #1a3cb8;
    --secondary: #00d4aa;
    --secondary-light: #33e0be;
    --accent: #ff6b35;
    --text-dark: #1a2234;
    --text-body: #4a5568;
    --text-muted: #718096;
    --bg-light: #f7fafc;
    --bg-card: #ffffff;
    --bg-dark: #1a2234;
    --border: #e2e8f0;
    --shadow-sm: 0 2px 8px rgba(45,90,240,0.08);
    --shadow-md: 0 8px 24px rgba(45,90,240,0.12);
    --shadow-lg: 0 16px 48px rgba(45,90,240,0.16);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-body);
    background: var(--bg-light);
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    color: var(--primary-dark);
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    letter-spacing: -0.5px;
}

.nav-desktop {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-body);
    padding: 8px 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
    border-radius: 1px;
}

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

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

.btn-contact-header {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(45,90,240,0.3);
}

.btn-contact-header:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(45,90,240,0.4);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-mobile {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    padding: 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
}

.nav-mobile.active {
    display: block;
}

.nav-link-mobile {
    display: block;
    padding: 12px 0;
    font-size: 16px;
    color: var(--text-body);
    border-bottom: 1px solid var(--border);
}

.btn-contact-mobile {
    width: 100%;
    margin-top: 16px;
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26,34,52,0.85), rgba(45,90,240,0.7));
}

.hero-bg-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content {
    position: relative;
    z-index: 1;
    color: white;
    max-width: 700px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    margin-bottom: 24px;
    opacity: 0.9;
}

.breadcrumb a {
    color: white;
    opacity: 0.8;
}

.breadcrumb a:hover {
    opacity: 1;
}

.breadcrumb .sep {
    opacity: 0.5;
}

.breadcrumb .current {
    opacity: 0.9;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 12px;
    line-height: 1.6;
}

.hero-update {
    font-size: 14px;
    opacity: 0.8;
    margin-bottom: 32px;
    padding: 8px 16px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-full);
    display: inline-block;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: white;
    color: var(--primary);
    padding: 16px 32px;
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    color: var(--primary-dark);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: white;
    padding: 16px 32px;
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 600;
    border: 2px solid rgba(255,255,255,0.5);
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    border-color: white;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 18px;
    color: var(--text-muted);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 48px;
}

.about {
    padding: 100px 0;
    background: white;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 60px;
    align-items: center;
    margin-bottom: 60px;
}

.about-lead {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-content p {
    margin-bottom: 16px;
}

.about-img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-light);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

.feature-card:hover {
    background: white;
    border-color: var(--border);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
}

.download {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-light) 0%, white 100%);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.download-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    border: 2px solid var(--border);
    transition: var(--transition);
    position: relative;
}

.download-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.download-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.download-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--accent), #ff8f65);
    color: white;
    padding: 6px 20px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
}

.download-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.android-icon {
    background: linear-gradient(135deg, #3ddc84, #00c853);
}

.android-icon::before {
    content: '';
    width: 40px;
    height: 40px;
    background: white;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M17.6 9.48l1.84-3.18c.16-.31.04-.69-.26-.85a.637.637 0 00-.83.22l-1.88 3.24a11.463 11.463 0 00-8.94 0L5.65 5.67a.643.643 0 00-.87-.2c-.28.18-.37.54-.22.83L6.4 9.48A10.78 10.78 0 002 18h20a10.78 10.78 0 00-4.4-8.52zM7 15.25a1.25 1.25 0 110-2.5 1.25 1.25 0 010 2.5zm10 0a1.25 1.25 0 110-2.5 1.25 1.25 0 010 2.5z'/%3E%3C/svg%3E") center/contain no-repeat;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M17.6 9.48l1.84-3.18c.16-.31.04-.69-.26-.85a.637.637 0 00-.83.22l-1.88 3.24a11.463 11.463 0 00-8.94 0L5.65 5.67a.643.643 0 00-.87-.2c-.28.18-.37.54-.22.83L6.4 9.48A10.78 10.78 0 002 18h20a10.78 10.78 0 00-4.4-8.52zM7 15.25a1.25 1.25 0 110-2.5 1.25 1.25 0 010 2.5zm10 0a1.25 1.25 0 110-2.5 1.25 1.25 0 010 2.5z'/%3E%3C/svg%3E") center/contain no-repeat;
}

.ios-icon {
    background: linear-gradient(135deg, #007aff, #5856d6);
}

.ios-icon::before {
    content: '';
    width: 40px;
    height: 40px;
    background: white;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M18.71 19.5c-.83 1.24-1.71 2.45-3.05 2.47-1.34.03-1.77-.79-3.29-.79-1.53 0-2 .77-3.27.82-1.31.05-2.3-1.32-3.14-2.53C4.25 17 2.94 12.45 4.7 9.39c.87-1.52 2.43-2.48 4.12-2.51 1.28-.02 2.5.87 3.29.87.78 0 2.26-1.07 3.81-.91.65.03 2.47.26 3.64 1.98-.09.06-2.17 1.28-2.15 3.81.03 3.02 2.65 4.03 2.68 4.04-.03.07-.42 1.44-1.38 2.83M13 3.5c.73-.83 1.94-1.46 2.94-1.5.13 1.17-.34 2.35-1.04 3.19-.69.85-1.83 1.51-2.95 1.42-.15-1.15.41-2.35 1.05-3.11z'/%3E%3C/svg%3E") center/contain no-repeat;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M18.71 19.5c-.83 1.24-1.71 2.45-3.05 2.47-1.34.03-1.77-.79-3.29-.79-1.53 0-2 .77-3.27.82-1.31.05-2.3-1.32-3.14-2.53C4.25 17 2.94 12.45 4.7 9.39c.87-1.52 2.43-2.48 4.12-2.51 1.28-.02 2.5.87 3.29.87.78 0 2.26-1.07 3.81-.91.65.03 2.47.26 3.64 1.98-.09.06-2.17 1.28-2.15 3.81.03 3.02 2.65 4.03 2.68 4.04-.03.07-.42 1.44-1.38 2.83M13 3.5c.73-.83 1.94-1.46 2.94-1.5.13 1.17-.34 2.35-1.04 3.19-.69.85-1.83 1.51-2.95 1.42-.15-1.15.41-2.35 1.05-3.11z'/%3E%3C/svg%3E") center/contain no-repeat;
}

.pc-icon {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

.pc-icon::before {
    content: '';
    width: 40px;
    height: 40px;
    background: white;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M21 2H3c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h7v2H8v2h8v-2h-2v-2h7c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm0 14H3V4h18v12z'/%3E%3C/svg%3E") center/contain no-repeat;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M21 2H3c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h7v2H8v2h8v-2h-2v-2h7c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm0 14H3V4h18v12z'/%3E%3C/svg%3E") center/contain no-repeat;
}

.download-card h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.download-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
    line-height: 1.6;
}

.download-features {
    list-style: none;
    text-align: left;
    margin-bottom: 24px;
}

.download-features li {
    font-size: 14px;
    color: var(--text-body);
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    border-bottom: 1px dashed var(--border);
}

.download-features li:last-child {
    border-bottom: none;
}

.download-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary);
    font-weight: 600;
}

.btn-download {
    width: 100%;
    padding: 14px;
    border: 2px solid var(--primary);
    background: transparent;
    color: var(--primary);
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

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

.btn-download.primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.download-note {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 12px;
}

.download-tips {
    background: linear-gradient(135deg, rgba(45,90,240,0.05), rgba(0,212,170,0.05));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.download-tips h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.download-tips p {
    font-size: 15px;
    line-height: 1.8;
}

.showcase {
    padding: 100px 0;
    background: var(--bg-dark);
    overflow: hidden;
}

.showcase .section-title {
    color: white;
}

.showcase .section-desc {
    color: rgba(255,255,255,0.7);
}

.showcase-slider {
    overflow: hidden;
    margin: 0 -20px;
    padding: 20px;
}

.showcase-track {
    display: flex;
    gap: 24px;
    animation: scrollSlider 30s linear infinite;
}

@keyframes scrollSlider {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.showcase-item {
    flex-shrink: 0;
    width: 270px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.showcase-item:hover {
    transform: scale(1.05);
}

.showcase-item img {
    width: 100%;
    height: auto;
}

.guide {
    padding: 100px 0;
    background: white;
}

.guide-steps {
    margin-bottom: 60px;
}

.guide-step {
    display: grid;
    grid-template-columns: 80px 1fr 300px;
    gap: 40px;
    align-items: center;
    padding: 40px 0;
    border-bottom: 1px solid var(--border);
}

.guide-step.reverse {
    grid-template-columns: 80px 300px 1fr;
}

.guide-step.reverse .step-image {
    order: -1;
}

.step-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
    opacity: 0.3;
}

.step-content h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.step-content p {
    font-size: 15px;
    line-height: 1.8;
}

.step-image img {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.guide-advanced {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 48px;
    margin-bottom: 48px;
}

.guide-advanced h3 {
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 32px;
    text-align: center;
}

.advanced-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.advanced-item {
    background: white;
    padding: 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.advanced-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.advanced-item p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
}

.guide-cta {
    text-align: center;
    padding: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-lg);
    color: white;
}

.guide-cta p {
    font-size: 18px;
    margin-bottom: 20px;
}

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

.security {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-light) 0%, white 100%);
}

.security-overview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 60px;
}

.security-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.security-content h3 {
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.security-content p {
    margin-bottom: 16px;
    line-height: 1.8;
}

.security-tips {
    margin-bottom: 48px;
}

.security-tips h3 {
    font-size: 24px;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 12px;
}

.tips-intro {
    text-align: center;
    margin-bottom: 32px;
    color: var(--text-muted);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.tip-card {
    background: white;
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.tip-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.tip-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tip-icon.warning {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
}

.tip-icon.warning::before {
    content: '⚠';
    font-size: 28px;
}

.tip-icon.shield {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
}

.tip-icon.shield::before {
    content: '🛡';
    font-size: 28px;
}

.tip-icon.lock {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
}

.tip-icon.lock::before {
    content: '🔒';
    font-size: 28px;
}

.tip-icon.alert {
    background: linear-gradient(135deg, #ef4444, #f87171);
}

.tip-icon.alert::before {
    content: '🚨';
    font-size: 28px;
}

.tip-card h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.tip-card p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
}

.security-notice {
    background: linear-gradient(135deg, rgba(239,68,68,0.05), rgba(251,191,36,0.05));
    border: 1px solid rgba(239,68,68,0.2);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.security-notice h3 {
    font-size: 18px;
    color: #dc2626;
    margin-bottom: 16px;
}

.security-notice p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 12px;
}

.security-notice p:last-child {
    margin-bottom: 0;
}

.faq {
    padding: 100px 0;
    background: white;
}

.faq-list {
    max-width: 900px;
    margin: 0 auto 48px;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    overflow: hidden;
    transition: var(--transition);
}

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

.faq-item.active {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    cursor: pointer;
    background: white;
    transition: var(--transition);
}

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

.faq-question h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
    padding-right: 20px;
}

.faq-toggle {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-light);
    position: relative;
    flex-shrink: 0;
    transition: var(--transition);
}

.faq-toggle::before,
.faq-toggle::after {
    content: '';
    position: absolute;
    background: var(--primary);
    border-radius: 2px;
    transition: var(--transition);
}

.faq-toggle::before {
    width: 12px;
    height: 2px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.faq-toggle::after {
    width: 2px;
    height: 12px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.faq-item.active .faq-toggle {
    background: var(--primary);
}

.faq-item.active .faq-toggle::before,
.faq-item.active .faq-toggle::after {
    background: white;
}

.faq-item.active .faq-toggle::after {
    transform: translate(-50%, -50%) rotate(90deg);
}

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

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 24px 24px;
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-body);
}

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

.faq-more p {
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.faq-more .btn-secondary {
    background: var(--bg-light);
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.brand {
    padding: 100px 0;
    background: var(--bg-light);
}

.brand-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 60px;
    align-items: center;
}

.brand-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.brand-text p {
    margin-bottom: 20px;
    line-height: 1.9;
    font-size: 16px;
}

.contact {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.contact .section-title {
    color: white;
}

.contact .section-desc {
    color: rgba(255,255,255,0.8);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
}

.contact-info {
    color: white;
}

.contact-info h3 {
    font-size: 24px;
    margin-bottom: 20px;
}

.contact-info p {
    margin-bottom: 12px;
    opacity: 0.9;
    line-height: 1.8;
}

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

.btn-contact-large {
    display: inline-block;
    background: white;
    color: var(--primary);
    padding: 20px 48px;
    border-radius: var(--radius-full);
    font-size: 18px;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
}

.btn-contact-large:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.contact-note {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    margin-top: 16px;
}

.news {
    padding: 100px 0;
    background: white;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.news-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.news-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.news-image {
    height: 180px;
    overflow: hidden;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.news-card:hover .news-image img {
    transform: scale(1.05);
}

.news-content {
    padding: 24px;
}

.news-date {
    display: inline-block;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.news-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
    line-height: 1.4;
}

.news-content p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
}

.footer {
    background: var(--bg-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-top {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 30px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-brand img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
}

.footer-brand span {
    font-size: 20px;
    font-weight: 700;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: white;
}

.footer-column a {
    display: block;
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    padding: 8px 0;
    transition: var(--transition);
}

.footer-column a:hover {
    color: white;
    padding-left: 8px;
}

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

.footer-legal {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 20px;
}

.footer-legal a {
    color: rgba(255,255,255,0.6);
    font-size: 13px;
}

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

.footer-copyright {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 12px;
}

.footer-disclaimer {
    font-size: 12px;
    color: rgba(255,255,255,0.4);
    max-width: 600px;
    margin: 0 auto;
}

.float-buttons {
    position: fixed;
    right: 24px;
    bottom: 100px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 999;
}

.float-btn {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.contact-float {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
}

.contact-float:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.backtop {
    background: white;
    color: var(--text-dark);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.backtop.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.backtop:hover {
    background: var(--bg-light);
}

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .guide-step {
        grid-template-columns: 60px 1fr;
        gap: 24px;
    }
    
    .guide-step.reverse {
        grid-template-columns: 60px 1fr;
    }
    
    .step-image {
        display: none;
    }
    
    .guide-step.reverse .step-image {
        order: 0;
    }
    
    .advanced-grid {
        grid-template-columns: 1fr;
    }
    
    .security-overview {
        grid-template-columns: 1fr;
    }
    
    .brand-content {
        grid-template-columns: 1fr;
    }
    
    .brand-image {
        order: -1;
        max-width: 300px;
        margin: 0 auto;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 768px) {
    .nav-desktop,
    .btn-contact-header {
        display: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .header-inner {
        height: 64px;
    }
    
    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-actions .btn-primary,
    .hero-actions .btn-secondary {
        width: 100%;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .section-desc {
        font-size: 16px;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        order: -1;
        max-width: 280px;
        margin: 0 auto;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand {
        justify-content: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer-legal {
        flex-wrap: wrap;
        gap: 16px;
    }
    
    .float-buttons {
        right: 16px;
        bottom: 80px;
    }
    
    .float-btn {
        width: 48px;
        height: 48px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 26px;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .download-card {
        padding: 32px 20px;
    }
    
    .guide-advanced {
        padding: 32px 20px;
    }
    
    .faq-question {
        padding: 16px 20px;
    }
    
    .faq-question h3 {
        font-size: 15px;
    }
}