/* Reset and Base Styles */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

:root {
    --primary-color: #0f766e;
    --primary-hover: #115e59;
    --secondary-color: #f59e0b;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --bg-main: #f9fafb;
    --bg-card: #ffffff;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-main);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* Header & Nav */
.header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.2s ease;
    font-size: 0.95rem;
}

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

/* Buttons */
.btn-primary, .btn-buy {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    background-color: var(--primary-color);
    color: white;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

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

.btn-buy {
    width: 100%;
    margin-top: 15px;
    font-size: 1rem;
}

/* Hero Section - Split Layout Redesign */
.hero {
    background: var(--bg-main);
    padding: 60px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(15,118,110,0.08) 0%, rgba(249,250,251,0) 70%);
    z-index: 0;
}

.hero .container {
    position: relative;
    z-index: 1;
}

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

.hero-text {
    max-width: 600px;
}

.hero-text h2 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--text-main);
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-text p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    line-height: 1.6;
}

.hero-image {
    position: relative;
    height: 500px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #e0f2fe 0%, #ccfbf1 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255,255,255,0.5);
    overflow: hidden;
}

.hero-image-placeholder {
    font-size: 8rem;
    filter: drop-shadow(0 20px 30px rgba(0,0,0,0.1));
    animation: float 6s ease-in-out infinite;
}

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

/* Sections General */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 50px;
    font-size: 1.15rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Features - Redesigned to Cards */
.features {
    background-color: var(--bg-card);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-item {
    padding: 30px;
    background: var(--bg-main);
    border-radius: var(--radius-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

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

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    background: white;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

.feature-item h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.feature-item p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Products - Enhanced Grid and Cards */
.products {
    background-color: var(--bg-main);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 40px 30px;
}

.product-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    position: relative;
}

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

.product-image {
    height: 240px;
    background: linear-gradient(to bottom right, #f3f4f6, #e5e7eb);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.hot-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 600;
    letter-spacing: 0.5px;
    z-index: 2;
    box-shadow: 0 4px 6px rgba(15,118,110,0.3);
}

.product-info {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.product-info h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
    color: var(--text-main);
}

.product-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 20px;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.price-compare {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 8px;
}

.sale-price {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-main);
}

.original-price {
    text-decoration: line-through;
    color: #9ca3af;
    font-size: 1rem;
    font-weight: 500;
}

.profit-margin {
    color: var(--success-color);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 12px;
    background: rgba(16,185,129,0.1);
    display: inline-block;
    padding: 4px 10px;
    border-radius: 6px;
}

.product-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    font-size: 0.9rem;
}

.product-rating {
    color: #fbbf24;
    letter-spacing: 2px;
}

.stock-status {
    color: var(--warning-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 4px;
}

.bulk-discount {
    margin-top: 60px;
    background: linear-gradient(to right, #fef3c7, #fde68a);
    padding: 30px;
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid #fcd34d;
    box-shadow: var(--shadow-md);
}

.bulk-discount h3 {
    color: #b45309;
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.bulk-discount p {
    color: #92400e;
    font-size: 1.1rem;
}

/* Why Choose Us - Redesigned Table */
.why-choose {
    background-color: var(--bg-card);
}

.comparison-table {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.comparison-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    border-bottom: 1px solid var(--border-color);
}

.comparison-row:last-child {
    border-bottom: none;
}

.comparison-row.header {
    background: var(--bg-main);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

.comp-item {
    padding: 24px;
    display: flex;
    align-items: center;
}

.comp-item:not(:first-child) {
    justify-content: center;
    text-align: center;
    border-left: 1px solid var(--border-color);
}

.comp-item:first-child {
    font-weight: 500;
    color: var(--text-main);
}

.comp-item.paidou {
    background-color: rgba(15,118,110,0.05);
    color: var(--primary-color);
    font-weight: 600;
}

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

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    margin-bottom: 24px;
    font-size: 1.15rem;
    color: var(--text-muted);
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 8px;
    line-height: 1;
}

.stat-label {
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

/* Testimonials */
.testimonials {
    background-color: var(--bg-card);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background: var(--bg-main);
    padding: 40px 30px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    position: relative;
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 20px;
    left: 30px;
    font-size: 4rem;
    color: var(--border-color);
    font-family: serif;
    line-height: 1;
}

.testimonial-rating {
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.testimonial-text {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-main);
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    font-weight: 600;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 12px;
}

.testimonial-author::before {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background: var(--primary-color);
}

/* Contact Section */
.contact {
    background-color: var(--bg-main);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 60px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.contact-form {
    padding: 50px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-main);
    font-size: 0.95rem;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
    background: var(--bg-main);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(15,118,110,0.1);
    background: white;
}

.contact-info {
    background: var(--primary-color);
    color: white;
    padding: 50px;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.info-item h3 {
    margin-bottom: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    display: flex;
    align-items: center;
    gap: 10px;
}

.info-item p {
    color: #ccfbf1;
    line-height: 1.6;
    margin-left: 35px;
}

/* FAQ */
.faq {
    background-color: var(--bg-card);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.faq-item {
    background: var(--bg-main);
    padding: 24px 30px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.faq-item h3 {
    margin-bottom: 12px;
    color: var(--text-main);
    font-size: 1.15rem;
}

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

/* Footer */
.footer {
    background: #111827;
    color: #f9fafb;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 60px;
}

.footer-section h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: white;
    font-weight: 700;
}

.footer-section h4 {
    margin-bottom: 24px;
    color: white;
    font-weight: 600;
    font-size: 1.1rem;
}

.footer-section p {
    color: #9ca3af;
    margin-bottom: 16px;
    line-height: 1.7;
}

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

.footer-section ul li a {
    color: #9ca3af;
    transition: color 0.2s;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid #374151;
    padding-top: 30px;
    color: #9ca3af;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-text h2 {
        font-size: 2.75rem;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text {
        margin: 0 auto;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .comparison-row {
        grid-template-columns: 1fr;
    }
    
    .comp-item:not(:first-child) {
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding: 16px;
    }
    
    .comp-item.paidou {
        background: rgba(15,118,110,0.1);
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
    }
}