/* ===== CSS Variables ===== */
:root {
    --primary-color: #00a651;
    --primary-dark: #008c45;
    --logo-color: #0066cc;
    --logo-color-dark: #0052a3;
    --secondary-color: #1a1a2e;
    --accent-color: #f39c12;
    --text-color: #333333;
    --text-light: #666666;
    --white: #ffffff;
    --light-bg: #f8f9fa;
    --border-color: #e0e0e0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

ul {
    list-style: none;
}

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

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

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-align: center;
}

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

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

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

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

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

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

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

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo a {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo-text {
    font-size: 2rem;
    font-weight: 700;
    color: var(--logo-color);
    letter-spacing: 2px;
}

.logo-img {
    height: 40px;
    width: auto;
    display: block;
}

.logo-tagline {
    font-size: 0.75rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    font-weight: 500;
    color: var(--text-color);
    padding: 10px 0;
    position: relative;
}

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

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

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

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

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--white);
    box-shadow: var(--shadow-lg);
    border-radius: 5px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 100;
}

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

.dropdown-menu li a {
    display: block;
    padding: 12px 20px;
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
}

.dropdown-menu li:last-child a {
    border-bottom: none;
}

.dropdown-menu li a:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    padding-top: 80px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="%2300a651" stroke-width="0.5" opacity="0.1"/><circle cx="50" cy="50" r="30" fill="none" stroke="%2300a651" stroke-width="0.5" opacity="0.1"/><circle cx="50" cy="50" r="20" fill="none" stroke="%2300a651" stroke-width="0.5" opacity="0.1"/></svg>');
    background-size: 200px;
    opacity: 0.5;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(0, 166, 81, 0.1) 0%, transparent 50%);
}

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

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

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

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

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

.section-header h2 {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.section-header p {
    color: var(--text-light);
    font-size: 1.125rem;
}

/* ===== About Section ===== */
.about-section {
    background-color: var(--light-bg);
}

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

.about-text p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background-color: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

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

/* ===== Products Section ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.product-card {
    background-color: var(--white);
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

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

.product-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--light-bg);
    border-radius: 50%;
    color: var(--primary-color);
}

.product-icon svg {
    width: 40px;
    height: 40px;
}

.product-card h3 {
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.product-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.product-features {
    text-align: left;
    margin-bottom: 20px;
}

.product-features li {
    padding: 5px 0;
    padding-left: 20px;
    position: relative;
    color: var(--text-light);
    font-size: 0.85rem;
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* ===== Why Choose Section ===== */
.why-choose-section {
    background-color: var(--secondary-color);
    color: var(--white);
}

.why-choose-section .section-header h2 {
    color: var(--white);
}

.why-choose-section .section-header p {
    color: rgba(255, 255, 255, 0.7);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 30px;
}

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

.feature-icon svg {
    width: 35px;
    height: 35px;
}

.feature-item h3 {
    margin-bottom: 10px;
}

.feature-item p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

/* ===== CTA Section ===== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    text-align: center;
    color: var(--white);
}

.cta-content h2 {
    margin-bottom: 15px;
}

.cta-content p {
    margin-bottom: 30px;
    opacity: 0.9;
}

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

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

/* ===== Footer ===== */
.footer {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 2fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    margin-bottom: 20px;
}

.footer-logo .logo-text {
    color: #66b3ff;
}

.footer-logo .logo-img {
    height: 36px;
    filter: brightness(0) invert(1);
}

.footer-logo .logo-tagline {
    color: rgba(255, 255, 255, 0.7);
}

.footer-col p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer-col h4 {
    color: var(--white);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

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

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer-col ul li a:hover {
    color: var(--primary-color);
}

.footer-col address {
    font-style: normal;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer-col address a {
    color: var(--primary-color);
}

.footer-col address a:hover {
    text-decoration: underline;
}

.footer-bottom {
    text-align: center;
    padding: 20px 0;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
}

/* ===== Page Header (for inner pages) ===== */
.page-header {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    padding: 150px 0 80px;
    text-align: center;
    color: var(--white);
}

.page-header h1 {
    margin-bottom: 15px;
}

.page-header p {
    opacity: 0.9;
    font-size: 1.125rem;
}

/* ===== Content Sections ===== */
.content-section {
    padding: 80px 0;
}

.content-section.alt {
    background-color: var(--light-bg);
}

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

.content-grid.reverse {
    direction: rtl;
}

.content-grid.reverse > * {
    direction: ltr;
}

/* ===== Product Detail Page ===== */
.product-detail-section {
    padding: 80px 0;
}

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

.product-intro-text h2 {
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.product-intro-text p {
    color: var(--text-light);
    margin-bottom: 15px;
}

.product-image {
    background-color: var(--light-bg);
    border-radius: 10px;
    padding: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.product-image svg {
    width: 200px;
    height: 200px;
    color: var(--primary-color);
}

.specs-section {
    background-color: var(--light-bg);
    padding: 60px 0;
}

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

.spec-card {
    background-color: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.spec-card h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.spec-card ul li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.9rem;
}

.spec-card ul li:last-child {
    border-bottom: none;
}

/* ===== Contact Page ===== */
.contact-section {
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3 {
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.contact-info p {
    color: var(--text-light);
    margin-bottom: 30px;
}

.contact-details {
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 20px;
}

.contact-item-icon {
    width: 50px;
    height: 50px;
    background-color: var(--light-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    flex-shrink: 0;
}

.contact-item-icon svg {
    width: 24px;
    height: 24px;
}

.contact-item-text h4 {
    color: var(--secondary-color);
    margin-bottom: 5px;
    font-size: 1rem;
}

.contact-item-text p {
    color: var(--text-light);
    margin-bottom: 0;
    font-size: 0.9rem;
}

.contact-item-text a {
    color: var(--primary-color);
}

.contact-form {
    background-color: var(--light-bg);
    padding: 40px;
    border-radius: 10px;
}

.contact-form h3 {
    color: var(--secondary-color);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 166, 81, 0.1);
}

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

/* ===== About Page ===== */
.about-hero {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
}

.about-hero p {
    color: var(--text-light);
    font-size: 1.125rem;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background-color: var(--primary-color);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 40px;
}

.timeline-item:nth-child(odd) {
    flex-direction: row-reverse;
}

.timeline-content {
    width: 45%;
    padding: 20px;
    background-color: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.timeline-content h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.timeline-content p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0;
}

.timeline-dot {
    width: 20px;
    height: 20px;
    background-color: var(--primary-color);
    border-radius: 50%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

/* ===== Map Section ===== */
.map-section {
    padding: 0;
}

.map-container {
    height: 400px;
    background-color: var(--light-bg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.map-placeholder {
    text-align: center;
    color: var(--text-light);
}

.map-placeholder svg {
    width: 60px;
    height: 60px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .products-grid,
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .specs-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }

    .main-nav {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background-color: var(--white);
        padding: 20px;
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: 0;
    }

    .nav-item {
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: 15px;
        border-bottom: 1px solid var(--border-color);
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background-color: var(--light-bg);
        display: none;
    }

    .dropdown.active .dropdown-menu {
        display: block;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .about-content,
    .content-grid,
    .product-intro,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .content-grid.reverse {
        direction: ltr;
    }

    .products-grid,
    .features-grid,
    .specs-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    section {
        padding: 60px 0;
    }

    .btn {
        width: 100%;
    }
}