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

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

body {
    font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #212529;
    background-color: #fff;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

a:hover {
    color: #007BFF;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --primary-color: #1B365C;
    --secondary-color: #F8F9FA;
    --accent-color: #007BFF;
    --success-color: #28A745;
    --warning-color: #FFC107;
    --error-color: #DC3545;
    --text-primary: #212529;
    --text-secondary: #6C757D;
    --text-light: #ADB5BD;
    --border-color: #DEE2E6;
    --shadow-light: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-heavy: 0 8px 24px rgba(0,0,0,0.2);
    
    /* Typography */
    --font-primary: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    --font-secondary: 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-japanese: 'Noto Sans JP', 'Yu Gothic', sans-serif;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 64px;
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 80px;
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-btn: 6px;
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0.0, 0.2, 1);
    --transition-standard: 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* ===== Utility Classes ===== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xxl) 0;
}

.section-dark {
    background-color: var(--secondary-color);
}

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

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header {
    margin-bottom: var(--spacing-xxl);
}

/* ===== Loading Screen ===== */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-logo {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    animation: pulse 2s infinite;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid white;
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    animation: spin 1s linear infinite;
}

.loading-text {
    font-size: 1.2rem;
    opacity: 0.8;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ===== Button Styles ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    border-radius: var(--border-radius-btn);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-standard);
    cursor: pointer;
    border: 2px solid transparent;
    min-height: 44px;
    min-width: 120px;
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-outline {
    background-color: transparent;
    color: white;
    border-color: white;
}

.btn-outline:hover {
    background-color: white;
    color: var(--primary-color);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-loading .btn-text {
    opacity: 0;
}

.btn-loading .btn-loading {
    display: flex;
    align-items: center;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* ===== Navigation Styles ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-light);
    transition: all var(--transition-standard);
    height: var(--header-height);
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-medium);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.nav-brand {
    display: flex;
    align-items: center;
}

.nav-logo {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-lg);
}

.nav-link {
    display: block;
    padding: var(--spacing-sm) 0;
    color: var(--text-primary);
    font-weight: 500;
    position: relative;
    transition: color var(--transition-standard);
}

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ===== Language Switcher ===== */
.language-switcher {
    display: flex;
    gap: 4px;
}

.lang-btn {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: white;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-standard);
    cursor: pointer;
}

.lang-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.lang-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* ===== Mobile Navigation ===== */
.nav-toggle {
    display: none;
    flex-direction: column;
    width: 30px;
    height: 24px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--text-primary);
    margin-bottom: 3px;
    transition: all var(--transition-standard);
    transform-origin: center;
}

.nav-toggle span:last-child {
    margin-bottom: 0;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

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

/* ===== Hero Section ===== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
}

.hero-slider {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-slide.active {
    opacity: 1;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(27, 54, 92, 0.6);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    width: 100%;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
    animation: fadeInUp 1s ease-out 0.3s both;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.6s both;
}

/* Hero Controls */
.hero-controls {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 3;
}

.hero-prev {
    left: var(--spacing-md);
}

.hero-next {
    right: var(--spacing-md);
}

.hero-prev,
.hero-next {
    position: absolute;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    transition: all var(--transition-standard);
    cursor: pointer;
}

.hero-prev:hover,
.hero-next:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* Hero Indicators */
.hero-indicators {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
    z-index: 3;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all var(--transition-standard);
}

.indicator.active {
    background: white;
    transform: scale(1.2);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    color: white;
    opacity: 0.8;
    z-index: 3;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid white;
    border-bottom: 2px solid white;
    transform: rotate(45deg);
    animation: bounce 2s infinite;
    margin-bottom: var(--spacing-xs);
}

.scroll-text {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) rotate(45deg);
    }
    40% {
        transform: translateY(-10px) rotate(45deg);
    }
    60% {
        transform: translateY(-5px) rotate(45deg);
    }
}

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

/* ===== About Section ===== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    margin-bottom: var(--spacing-xxl);
}

.about-text {
    padding-right: var(--spacing-md);
}

.about-intro h3 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.about-intro p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

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

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: transform var(--transition-standard);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.about-image {
    position: relative;
}

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

.about-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--success-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.about-values {
    margin-top: var(--spacing-xxl);
}

.about-values h3 {
    font-size: 2rem;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.value-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: transform var(--transition-standard);
}

.value-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.value-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: white;
    font-size: 2rem;
}

.value-item h4 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

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

/* ===== Products Section ===== */
.products {
    padding: var(--spacing-xxl) 0;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.product-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: all var(--transition-standard);
}

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

.product-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

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

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

.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(27, 54, 92, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-standard);
}

.product-card:hover .product-overlay {
    opacity: 1;
}

.product-icon {
    color: white;
    font-size: 3rem;
}

.product-content {
    padding: var(--spacing-lg);
}

.product-content h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.product-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.product-features {
    list-style: none;
    padding: 0;
    margin: 0;
}

.product-features li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-md);
}

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

/* ===== Features Section ===== */
.features {
    padding: var(--spacing-xxl) 0;
    background-color: var(--secondary-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: all var(--transition-standard);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: white;
    font-size: 2rem;
}

.feature-item h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

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

/* ===== Contact Section ===== */
.contact {
    padding: var(--spacing-xxl) 0;
}

/* .contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
} */

.contact-info {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    padding-right: var(--spacing-md);
}

.contact-item {
    width: calc(50% - var(--spacing-md));
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: transform var(--transition-standard);
}

.contact-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-right: var(--spacing-md);
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.contact-details p {
    color: var(--text-secondary);
    margin: 0;
}

/* Contact Form */
.contact-form-wrapper {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
}

.contact-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    transition: border-color var(--transition-standard);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-group input.error,
.form-group textarea.error {
    border-color: var(--error-color);
}

.form-error {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    display: block;
}

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

.contact-form .btn {
    grid-column: 1 / -1;
    margin-top: var(--spacing-md);
}

/* ===== Footer Styles ===== */
.footer {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    height: 40px;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-standard);
}

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

.footer-contact p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.footer-contact i {
    width: 16px;
    flex-shrink: 0;
}

.footer-social h4 {
    margin-bottom: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all var(--transition-standard);
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-md);
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.copyright {
    color: rgba(255, 255, 255, 0.6);
    margin: 0;
}

.footer-bottom-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-bottom-links a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-standard);
}

.footer-bottom-links a:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* ===== Back to Top Button ===== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 50px;
    height: 50px;
    background: var(--accent-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-standard);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-standard);
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

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

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== Responsive Styles ===== */
@media (max-width: 1199.98px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
}

@media (max-width: 991.98px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .about-stats {
        grid-template-columns: repeat(4, 1fr);
    }
    
    /* .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    } */
    .contact-info {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    .contact-item {
        margin-bottom: var(--spacing-xs);
        width: 100%;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-lg);
    }
}

@media (max-width: 767.98px) {
    :root {
        --spacing-xxl: 48px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1.125rem;
    }
    
    /* Mobile Navigation */
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background: white;
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding: var(--spacing-xl) 0;
        transition: left var(--transition-standard);
        box-shadow: var(--shadow-medium);
        gap: var(--spacing-md);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .language-switcher {
        order: -1;
        margin-right: var(--spacing-sm);
    }
    
    /* Hero Section */
    .hero {
        height: 80vh;
        min-height: 500px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-controls {
        display: none;
    }
    
    /* About Section */
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    /* Products Section */
    .products-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    /* Features Section */
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    /* Contact Form */
    .contact-form {
        grid-template-columns: 1fr;
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .footer-links {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .social-links {
        justify-content: center;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
    
    .back-to-top {
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 575.98px) {
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .hero-controls {
        display: none;
    }
    
    .hero-prev,
    .hero-next {
        display: none;
    }
}

/* ===== Animation Classes ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* ===== Print Styles ===== */
@media print {
    .navbar,
    .hero-controls,
    .hero-indicators,
    .back-to-top {
        display: none !important;
    }
    
    .hero {
        height: auto;
        min-height: auto;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    .section-title {
        font-size: 18pt;
    }
    
    .btn {
        border: 1pt solid #000;
        background: none !important;
    }
}