/* ===== CSS Variables ===== */
:root {
    /* Primary Colors - Agricultural Green Theme */
    --primary-green: #1ba853;
    --primary-green-dark: #158c44;
    --primary-green-light: #2dc966;
    --accent-green: #00a651;
    --bg-green-light: #f0f9f4;
    --bg-green-gradient: linear-gradient(135deg, #1ba853 0%, #2dc966 50%, #00a651 100%);
    
    /* Secondary Colors */
    --accent-orange: #f5a623;
    --accent-yellow: #f5c342;
    --accent-teal: #17a2b8;
    
    /* Neutral Colors */
    --text-dark: #2c3e50;
    --text-gray: #666666;
    --text-light: #999999;
    --white: #ffffff;
    --bg-light: #f8faf9;
    --border-color: #e8e8e8;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(27, 168, 83, 0.08);
    --shadow-md: 0 4px 16px rgba(27, 168, 83, 0.12);
    --shadow-lg: 0 8px 32px rgba(27, 168, 83, 0.15);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);
    
    /* Typography */
    --font-primary: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-heading: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    
    /* Spacing */
    --section-padding: 80px 0;
    --container-padding: 0 20px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    background-color: var(--white);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

ul, ol {
    list-style: none;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--container-padding);
    width: 100%;
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--container-padding);
}

/* ===== Header & Navigation ===== */
.header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition-normal);
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    max-width: 1400px;
    margin: 0 auto;
}

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

.logo img {
    height: 45px;
    width: auto;
}

.logo-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-green);
    display: none;
}

/* Main Navigation */
.main-nav {
    display: none;
}

.main-nav.active {
    display: flex;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 10px 20px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-dark);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

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

/* Dropdown Menu */
.nav-dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 5px;
}

.dropdown-toggle::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid currentColor;
    transition: var(--transition-fast);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 160px;
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition-normal);
    padding: 8px 0;
    z-index: 100;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: 10px 20px;
    font-size: 0.9rem;
    color: var(--text-dark);
    transition: var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--bg-green-light);
    color: var(--primary-green);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--primary-green);
    border-radius: 2px;
    transition: var(--transition-normal);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--bg-green-gradient);
    overflow: hidden;
    padding-top: 70px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255,255,255,0.05) 0%, transparent 40%);
    pointer-events: none;
}

.hero-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
    color: var(--white);
    max-width: 600px;
}

.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(10px);
    padding: 8px 20px;
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    margin-bottom: 20px;
    border: 1px solid rgba(255,255,255,0.3);
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-title .highlight {
    color: var(--accent-yellow);
    display: block;
}

.hero-desc {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 35px;
}

.hero-feature-tag {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    padding: 10px 18px;
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    border: 1px solid rgba(255,255,255,0.2);
    transition: var(--transition-fast);
}

.hero-feature-tag:hover {
    background: rgba(255,255,255,0.25);
    transform: translateY(-2px);
}

.hero-actions-wrapper {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.hero-actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.hero-contact {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 25px;
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    border: 2px solid rgba(255,255,255,0.3);
    transition: var(--transition-normal);
    width: fit-content;
    white-space: nowrap;
    height: fit-content;
    box-sizing: border-box;
}

.hero-contact:hover {
    background: rgba(255,255,255,0.25);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.hero-contact-icon {
    width: 25px;
    height: 25px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.hero-contact-icon svg {
    width: 18px;
    height: 18px;
    fill: var(--white);
}

.hero-contact-phone {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    text-decoration: none;
    letter-spacing: 1px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
    line-height: 1.2;
}

.hero-contact-phone:hover {
    color: var(--accent-yellow);
    text-shadow: 0 2px 8px rgba(245, 167, 35, 0.5);
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-phone-mockup {
    position: relative;
    max-width: 320px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.hero-phone-mockup img {
    border-radius: 30px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.3);
}

/* Decorative elements */
.hero-decor {
    position: absolute;
    pointer-events: none;
}

.hero-decor-circle {
    width: 200px;
    height: 200px;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 50%;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-xl);
    border: none;
    cursor: pointer;
    transition: var(--transition-normal);
}

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

.btn-primary:hover {
    background: var(--accent-yellow);
    color: var(--text-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

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

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

/* ===== Section Styles ===== */
.section {
    padding: var(--section-padding);
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-badge {
    display: inline-block;
    background: var(--bg-green-light);
    color: var(--primary-green);
    padding: 6px 16px;
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.section-title .green {
    color: var(--primary-green);
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-gray);
    max-width: 700px;
    margin: 0 auto;
}

/* ===== Features Section ===== */
.features {
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.feature-card {
    background: var(--white);
    padding: 35px 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-card);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: var(--bg-green-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    fill: var(--white);
}

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-gray);
    line-height: 1.7;
}

/* ===== System Overview ===== */
.system-overview {
    background: var(--white);
}

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

.system-text h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.system-text p {
    font-size: 1rem;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 15px;
}

.system-visual {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

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

.system-device img {
    max-height: 200px;
    margin-bottom: 10px;
}

.system-device span {
    font-size: 0.9rem;
    color: var(--text-gray);
}

/* ===== Functions Section ===== */
.functions {
    background: var(--bg-green-gradient);
    color: var(--white);
}

.functions .section-title {
    color: var(--white);
}

.functions .section-desc {
    color: rgba(255,255,255,0.9);
}

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

.function-card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    padding: 35px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255,255,255,0.2);
    transition: var(--transition-normal);
}

.function-card:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-5px);
}

.function-icon {
    width: 60px;
    height: 60px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.function-icon svg {
    width: 28px;
    height: 28px;
    fill: var(--white);
}

.function-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.function-card p {
    font-size: 0.95rem;
    opacity: 0.9;
    line-height: 1.7;
}

/* ===== Certificate Samples ===== */
.certificate-samples {
    background: var(--bg-light);
}

.samples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 25px;
}

.sample-card {
    background: var(--white);
    padding: 25px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    text-align: center;
}

.sample-card h4 {
    font-size: 1rem;
    color: var(--primary-green);
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.sample-placeholder {
    background: var(--bg-green-light);
    min-height: 300px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-green);
    font-size: 0.9rem;
    padding: 15px;
    overflow: hidden;
}

.sample-placeholder img {
    width: 100%;
    height: auto;
    max-width: 100%;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

/* ===== Devices Section ===== */
.devices {
    background: var(--white);
}

.devices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.device-card {
    text-align: center;
    padding: 30px 20px;
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
}

.device-card:hover {
    background: var(--bg-green-light);
}

.device-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.device-icon svg {
    width: 60px;
    height: 60px;
    fill: var(--primary-green);
}

.device-card h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.device-card p {
    font-size: 0.9rem;
    color: var(--text-gray);
}

/* ===== QR Code Section ===== */
.qrcode-section {
    background: linear-gradient(135deg, var(--bg-green-light) 0%, var(--white) 100%);
    text-align: center;
}

.qrcode-grid {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

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

.qrcode-item img {
    width: 160px;
    height: 160px;
    object-fit: contain;
    margin-bottom: 15px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
}

.qrcode-item p {
    font-size: 1rem;
    color: var(--text-dark);
    font-weight: 500;
}

/* ===== Footer ===== */
.footer {
    background: linear-gradient(180deg, #2c3e50 0%, #1a252f 100%);
    color: var(--white);
    padding: 60px 0 30px;
    margin-top: auto;
}

.footer-inner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 350px;
}

.footer-brand img {
    height: 50px;
    margin-bottom: 20px;
    filter: brightness(0) invert(1);
}

.footer-brand p {
    font-size: 0.95rem;
    opacity: 0.8;
    line-height: 1.7;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-links ul li {
    margin-bottom: 12px;
}

.footer-links a {
    font-size: 0.95rem;
    opacity: 0.8;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary-green-light);
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
    font-size: 0.95rem;
    opacity: 0.9;
}

.footer-contact-item svg {
    width: 20px;
    height: 20px;
    fill: var(--primary-green-light);
    flex-shrink: 0;
}

.footer-qrcodes {
    display: flex;
    gap: 20px;
}

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

.footer-qrcode img {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}

.footer-qrcode span {
    font-size: 0.8rem;
    opacity: 0.7;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 25px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    opacity: 0.6;
    margin-bottom: 5px;
}

.footer-bottom a {
    color: var(--primary-green-light);
}

.footer-stats {
    font-size: 0.8rem !important;
    opacity: 0.5 !important;
    margin-top: 10px !important;
}

.footer-stats span {
    color: var(--primary-green-light);
    font-weight: 500;
}

/* ===== Page Header (for inner pages) ===== */
.page-header {
    background: var(--bg-green-gradient);
    padding: 120px 0 60px;
    text-align: center;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 70%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(255,255,255,0.08) 0%, transparent 40%);
}

.page-header-content {
    position: relative;
    z-index: 1;
}

.page-header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
    font-size: 0.9rem;
}

.breadcrumb a {
    opacity: 0.8;
}

.breadcrumb a:hover {
    opacity: 1;
}

.breadcrumb span {
    opacity: 0.6;
}

/* ===== Content Section ===== */
.content-section {
    padding: 60px 0;
    background: var(--white);
}

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

.article-content {
    font-size: 1rem;
    line-height: 1.9;
    color: var(--text-dark);
}

.article-content h2 {
    font-size: 1.5rem;
    color: var(--primary-green);
    margin: 40px 0 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--bg-green-light);
}

.article-content h3 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin: 30px 0 15px;
}

.article-content p {
    margin-bottom: 15px;
    text-align: justify;
}

.article-content ol,
.article-content ul {
    margin: 15px 0;
    padding-left: 25px;
}

.article-content ol {
    list-style: decimal;
}

.article-content ul {
    list-style: disc;
}

.article-content li {
    margin-bottom: 10px;
}

/* ===== Help Section ===== */
.help-tabs {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
}

.help-tab {
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-xl);
    border: 2px solid var(--primary-green);
    background: transparent;
    color: var(--primary-green);
    cursor: pointer;
    transition: var(--transition-fast);
}

.help-tab:hover,
.help-tab.active {
    background: var(--primary-green);
    color: var(--white);
}

.help-steps {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.help-step {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 30px;
    align-items: start;
    background: var(--bg-light);
    padding: 30px;
    border-radius: var(--radius-lg);
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--bg-green-gradient);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

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

.step-content p {
    color: var(--text-gray);
    line-height: 1.8;
}

.step-content ol {
    margin-top: 15px;
    padding-left: 20px;
    list-style: decimal;
}

.step-content li {
    margin-bottom: 8px;
    color: var(--text-gray);
}

/* ===== Video Section ===== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.video-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: var(--transition-normal);
}

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

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    background: #000;
}

.video-wrapper video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-info {
    padding: 20px;
}

.video-info h3 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.video-info p {
    font-size: 0.9rem;
    color: var(--text-gray);
}

/* ===== About Section ===== */
.about-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 60px;
}

.about-intro h2 {
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.about-intro p {
    font-size: 1.05rem;
    color: var(--text-gray);
    line-height: 1.9;
    margin-bottom: 15px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: var(--bg-green-light);
    border-radius: var(--radius-md);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-green);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-top: 5px;
}

.about-values {
    background: var(--bg-light);
    padding: 60px 0;
}

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

.value-card {
    background: var(--white);
    padding: 35px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-card);
}

.value-icon {
    width: 70px;
    height: 70px;
    background: var(--bg-green-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.value-icon svg {
    width: 32px;
    height: 32px;
    fill: var(--white);
}

.value-card h3 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.value-card p {
    font-size: 0.95rem;
    color: var(--text-gray);
    line-height: 1.7;
}

/* ===== Responsive Design ===== */
@media (min-width: 768px) {
    .logo-text {
        display: block;
    }
    
    .main-nav {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: none;
    }
}

@media (max-width: 767px) {
    .header-inner {
        padding: 10px 15px;
    }
    
    .logo img {
        height: 38px;
    }
    
    .main-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--white);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        z-index: 999;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-link {
        font-size: 1.2rem;
        padding: 15px 30px;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: var(--bg-green-light);
        border-radius: var(--radius-md);
        margin-top: 10px;
    }
    
    .hero-inner {
        flex-direction: column;
        text-align: center;
        padding: 40px 0;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-features {
        justify-content: center;
    }
    
    .hero-actions-wrapper {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-contact {
        margin: 0 auto;
    }
    
    .hero-contact-phone {
        font-size: 1.2rem;
    }
    
    .hero-visual {
        order: -1;
        margin-bottom: 20px;
    }
    
    .hero-phone-mockup {
        max-width: 250px;
    }
    
    .section {
        padding: 50px 0;
    }
    
    .section-header {
        margin-bottom: 35px;
    }
    
    .system-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-hero {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .footer-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand {
        max-width: 100%;
    }
    
    .footer-qrcodes {
        justify-content: center;
    }
    
    .qrcode-grid {
        gap: 30px;
    }
    
    .help-step {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .step-number {
        margin: 0 auto;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .hero {
        min-height: auto;
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
    
    .hero-contact {
        padding: 12px 20px;
        justify-content: center;
    }
    
    .hero-contact-icon {
        width: 28px;
        height: 28px;
    }
    
    .hero-contact-icon svg {
        width: 16px;
        height: 16px;
    }
    
    .hero-contact-phone {
        font-size: 0.9rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .functions-grid {
        grid-template-columns: 1fr;
    }
    
    .devices-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }

.hidden { display: none; }
.visible { display: block; }