/* HONGFA Distributor Website - Modern CSS Styles */

/* CSS Variables */
:root {
    --primary-color: #0056a0;
    --primary-dark: #003366;
    --secondary-color: #4a90e2;
    --accent-color: #ffa500;
    --text-dark: #333333;
    --text-light: #666666;
    --text-muted: #999999;
    --background-grey: #f8f9fa;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
    --gradient: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

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

body {
    font-family: 'Lato', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

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

.container-narrow {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 20px;
    color: var(--text-dark);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Site Header */
.site-header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

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

.logo a {
    display: block;
}

/* Main Navigation */
.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 30px;
}

.main-nav a {
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.main-nav a:hover,
.main-nav a.active {
    background-color: var(--primary-color);
    color: var(--white);
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    position: relative;
    transition: background 0.2s ease-out;
}

.hamburger::before, .hamburger::after {
    content: '';
    display: block;
    width: 100%;
    height: 3px;
    background: var(--text-dark);
    position: absolute;
    transition: all 0.2s ease-out;
}

.hamburger::before { top: -8px; }
.hamburger::after { top: 8px; }

/* Hero Banner */
.hero-banner {
    background: var(--gradient);
    background-image: url('../images/hero-background.svg');
    background-size: cover;
    background-position: center;
    background-blend-mode: overlay;
    color: var(--white);
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 56, 160, 0.8);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-banner h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--white);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-banner p {
    font-size: 1.3rem;
    margin-bottom: 30px;
    color: rgba(255,255,255,0.9);
}

/* CTA Button */
.cta-button {
    display: inline-block;
    background: var(--accent-color);
    color: var(--white);
    padding: 15px 30px;
    border-radius: 50px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(255, 165, 0, 0.3);
}

.cta-button:hover {
    background: #ff8c00;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 165, 0, 0.4);
    color: var(--white);
}

.cta-button.secondary {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    box-shadow: none;
}

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

/* Why Choose Us Section */
.why-choose-us {
    padding: 80px 0;
    background: var(--background-grey);
}

.why-choose-us h2 {
    text-align: center;
    margin-bottom: 60px;
    font-size: 2.5rem;
    color: var(--primary-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 40px;
}

@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

.feature-item {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border-top: 4px solid var(--primary-color);
}

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

.feature-item img {
    width: 60px;
    height: 60px;
    margin-bottom: 20px;
}

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

.feature-item p {
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Product Categories Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

/* Product Categories 2-Row Horizontal Grid */
.category-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.category-list-item {
    background: var(--white);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.category-list-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.category-list-item img {
    width: 50px;
    height: 50px;
    margin-bottom: 15px;
}

.category-list-item .content {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
}

.category-list-item h3 {
    margin-bottom: 10px;
    font-size: 1.1rem;
    color: var(--primary-dark);
}

.category-list-item p {
    margin-bottom: 15px;
    font-size: 0.9rem;
    line-height: 1.4;
    flex: 1;
}

@media (max-width: 1200px) {
    .category-list {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .category-list {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }
    
    .category-list-item {
        flex-direction: row;
        text-align: left;
        align-items: center;
        gap: 15px;
    }
    
    .category-list-item img {
        margin-bottom: 0;
        flex-shrink: 0;
    }
    
    .category-list-item .content {
        align-items: flex-start;
    }
}

/* Solutions 2-Row Grid (3-2 layout for 5 items) */
.solutions-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.solution-list-item {
    background: var(--white);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.solution-list-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.solution-list-item img {
    width: 60px;
    height: 60px;
    margin-bottom: 15px;
    border-radius: 6px;
}

.solution-list-item .content {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
}

.solution-list-item h3 {
    margin-bottom: 10px;
    font-size: 1.1rem;
    color: var(--primary-dark);
}

.solution-list-item p {
    margin-bottom: 15px;
    font-size: 0.9rem;
    line-height: 1.4;
    flex: 1;
}

/* Center the last 2 items in the second row */
.solution-list-item:nth-child(4) {
    grid-column: 1;
}

.solution-list-item:nth-child(5) {
    grid-column: 3;
}

@media (max-width: 1200px) {
    .solutions-list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .solution-list-item:nth-child(4),
    .solution-list-item:nth-child(5) {
        grid-column: auto;
    }
}

@media (max-width: 768px) {
    .solutions-list {
        grid-template-columns: 1fr;
    }
    
    .solution-list-item {
        flex-direction: row;
        text-align: left;
        align-items: center;
        gap: 15px;
    }
    
    .solution-list-item img {
        margin-bottom: 0;
        flex-shrink: 0;
    }
    
    .solution-list-item .content {
        align-items: flex-start;
    }
    
    .solution-list-item:nth-child(4),
    .solution-list-item:nth-child(5) {
        grid-column: auto;
    }
}

.category-item {
    background: var(--white);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.category-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.category-item img {
    width: 50px;
    height: 50px;
    margin-bottom: 20px;
}

.category-item h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--primary-dark);
}

.category-item p {
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.learn-more-link {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.learn-more-link:hover {
    color: var(--primary-dark);
    transform: translateX(5px);
}

/* Page Header & Breadcrumbs */
.page-header {
    background: var(--gradient);
    color: var(--white);
    padding: 60px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--white);
}

.breadcrumb {
    display: flex;
    justify-content: center;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: 10px;
}

.breadcrumb-item a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
}

.breadcrumb-item.active {
    color: var(--white);
}

.breadcrumb-item + .breadcrumb-item::before {
    content: '/';
    padding: 0 8px;
    color: rgba(255,255,255,0.6);
}

/* Intro Text Section */
.intro-text {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
}

.intro-text h2 {
    font-size: 2.2rem;
    color: var(--primary-dark);
    margin-bottom: 20px;
}

.intro-text p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-light);
}

/* Lists and Grids */
.list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.list-item-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

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

.list-item-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-content {
    padding: 25px;
}

.card-content h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--primary-dark);
}

.card-content p {
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.article-meta,
.meta-info {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
    display: block;
}

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

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: start;
}

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

.contact-info p {
    margin-bottom: 10px;
    font-size: 1rem;
}

.contact-form {
    background: var(--background-grey);
    padding: 40px;
    border-radius: 15px;
}

.contact-form h3 {
    color: var(--primary-dark);
    margin-bottom: 25px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

/* Footer */
.site-footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
    margin-top: 80px;
}

.site-footer p {
    margin-bottom: 10px;
    color: rgba(255,255,255,0.8);
}

.footer-nav a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-nav a:hover {
    color: var(--white);
}

/* Responsive Design */
@media (max-width: 768px) {
    .site-header .container {
        flex-wrap: wrap;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .main-nav {
        display: none;
        width: 100%;
        order: 3;
    }
    
    .main-nav.is-active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 10px;
        padding: 20px 0;
        border-top: 1px solid var(--border-color);
        margin-top: 15px;
    }
    
    .hero-banner {
        padding: 60px 0;
    }
    
    .hero-banner h1 {
        font-size: 2.5rem;
    }
    
    .features-grid,
    .category-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .container,
    .container-narrow {
        padding: 0 15px;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.8rem; }
    h3 { font-size: 1.3rem; }
}

@media (max-width: 480px) {
    .hero-banner h1 {
        font-size: 2rem;
    }
    
    .hero-banner p {
        font-size: 1.1rem;
    }
    
    .cta-button {
        padding: 12px 25px;
        font-size: 0.9rem;
    }
    
    .feature-item,
    .category-item {
        padding: 25px 20px;
    }
}

/* Additional utility classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

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

.btn-group {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Filter Buttons (for news page) */
.filter-btn {
    margin: 0 10px;
    padding: 10px 20px;
    border: 2px solid var(--primary-color);
    background: white;
    color: var(--primary-color);
    border-radius: 25px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary-color);
    color: white;
}

/* Improved list layouts for technical articles */
.articles-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin: 40px 0;
}

.article-item {
    background: var(--white);
    border-radius: 8px;
    padding: 25px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

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

.article-item img {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
}

.article-item .card-content {
    flex: 1;
    padding: 0;
}

.article-item h3 {
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.article-item .meta-info {
    font-size: 0.75rem;
    margin-bottom: 8px;
}

.article-item p {
    margin-bottom: 12px;
    font-size: 0.9rem;
    line-height: 1.5;
}

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

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