/* 山东晟金 - 主样式表
 * Shinygold Global Trading - Main Stylesheet
 */

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

body {
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    background: #F8FAFC;
    color: #1e293b;
    line-height: 1.6;
}

/* ==================== CSS Variables ==================== */
:root {
    --primary: #0A2540;
    --secondary: #1E40AF;
    --accent: #FBBF24;
    --accent-dark: #D97706;
    --light: #F1F5F9;
    --dark: #0F172A;
    --text-muted: #64748B;
}

/* ==================== Header ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 37, 64, 0.95);
    backdrop-filter: blur(20px);
    transition: all 0.3s;
}

.header.scrolled {
    background: rgba(10, 37, 64, 0.98);
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary);
}

.logo-image {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 8px;
}

.logo-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.2;
}

.logo-en {
    font-size: 0.65rem;
    color: rgba(255,255,255,0.6);
    letter-spacing: 0.1em;
    margin-top: 2px;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav a:hover,
.nav a.active {
    color: var(--accent);
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s;
}

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

/* ==================== Language Switcher ==================== */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-btn {
    padding: 0.4rem 0.8rem;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 6px;
    color: rgba(255,255,255,0.6);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s;
}

.lang-btn.active {
    background: var(--accent);
    color: var(--primary);
    font-weight: 600;
}

.lang-btn:hover:not(.active) {
    background: rgba(255,255,255,0.2);
    color: #fff;
}

/* ==================== Hero Section ==================== */
.hero {
    margin-top: 80px;
    height: 450px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.hero-home {
    background: none;
}

/* ==================== Video Background ==================== */
.hero-home .video-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
}

.hero-home .hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-home .video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(10, 37, 64, 0.7) 0%, rgba(30, 64, 175, 0.6) 50%, rgba(30, 58, 138, 0.5) 100%);
    z-index: 1;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
    color: #fff;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* ==================== Hero Slider ==================== */
.hero-home .hero-slider {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.hero-home .slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
}

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

.hero-home .slide-content {
    text-align: center;
    color: #fff;
    max-width: 800px;
    padding: 0 2rem;
    z-index: 3;
    position: relative;
}

.hero-home .slide-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
}

.hero-home .slide-content p {
    font-size: 1.2rem;
    opacity: 0.95;
    margin-bottom: 2rem;
}

.hero-home .slide-content .btn-primary {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--accent);
    color: var(--primary);
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    transition: all 0.3s;
}

.hero-home .slide-content .btn-primary:hover {
    background: #FCD34D;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(251, 191, 36, 0.3);
}

.hero-home .slider-controls {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1rem;
    z-index: 10;
}

.hero-home .slider-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.3);
    cursor: pointer;
    transition: all 0.3s;
}

.hero-home .slider-dot.active {
    background: var(--accent);
    transform: scale(1.2);
}

.hero-home .slider-dot:hover {
    background: rgba(255,255,255,0.5);
}

.hero-home .slider-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: rgba(255,255,255,0.1);
    border: none;
    border-radius: 50%;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s;
    z-index: 10;
}

.hero-home .slider-arrow:hover {
    background: rgba(255,255,255,0.2);
}

.hero-home .slider-arrow.prev {
    left: 2rem;
}

.hero-home .slider-arrow.next {
    right: 2rem;
}

/* ==================== Section ==================== */
.section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3rem;
}

.section-tag {
    display: inline-block;
    padding: 0.3rem 1rem;
    background: rgba(10, 37, 64, 0.1);
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    border-radius: 50px;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 1rem;
}

.section-desc {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* ==================== Buttons ==================== */
.btn-primary {
    padding: 1rem 2.5rem;
    background: var(--accent);
    color: var(--primary);
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    background: #FCD34D;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(251, 191, 36, 0.15);
}

.btn-outline {
    padding: 1rem 2.5rem;
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-outline:hover {
    border-color: #fff;
    background: rgba(255,255,255,0.1);
}

/* ==================== Cards ==================== */
.card {
    background: #fff;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: all 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.12);
}

/* ==================== Grid Layouts ==================== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ==================== Product Card ==================== */
.product-card {
    background: #fff;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: all 0.3s;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

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

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.product-card:hover .product-image img {
    transform: scale(1.1);
}

.product-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent 50%, rgba(10, 37, 64, 0.8));
}

.product-content {
    padding: 2rem;
}

.product-content h3 {
    font-size: 1.5rem;
    color: var(--dark);
    margin-bottom: 0.75rem;
}

.product-content p {
    color: var(--text-muted);
    line-height: 1.7;
}

/* ==================== Partner Logo ==================== */
.partner-logo {
    background: #fff;
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s;
}

.partner-logo:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.partner-logo img {
    max-width: 100%;
    max-height: 80px;
    object-fit: contain;
    filter: grayscale(100%);
    transition: filter 0.3s;
}

.partner-logo:hover img {
    filter: grayscale(0%);
}

/* ==================== Advantage Card ==================== */
.advantage-card {
    background: #fff;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.12);
}

.advantage-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border-radius: 50%;
    color: var(--primary);
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.advantage-card h3 {
    font-size: 1.25rem;
    color: var(--dark);
    margin-bottom: 0.75rem;
}

.advantage-card p {
    color: var(--text-muted);
    line-height: 1.7;
}

/* ==================== Contact Section ==================== */
.contact-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    padding: 0 2rem;
}

.contact-card {
    background: #fff;
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: all 0.3s;
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.12);
}

.contact-card h3 {
    font-size: 1.5rem;
    color: var(--dark);
    margin-bottom: 1.5rem;
}

.contact-card h3 span {
    color: var(--accent-dark);
}

.contact-info {
    margin-top: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    color: var(--text-muted);
    line-height: 1.8;
}

.contact-item svg {
    width: 24px;
    height: 24px;
    stroke: var(--accent);
    margin-right: 1rem;
    flex-shrink: 0;
}

.contact-item strong {
    color: var(--dark);
    font-size: 1.1rem;
}

/* ==================== FAQ Section ==================== */
.faq {
    background: var(--light);
    padding: 4rem 0;
    margin-top: 2rem;
}

.faq-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.faq h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 2rem;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    padding: 0 2rem;
}

.faq-item {
    background: #fff;
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid rgba(0,0,0,0.05);
    transition: all 0.3s;
}

.faq-item:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
}

.faq-item h4 {
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 0.75rem;
}

.faq-item p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ==================== CTA Section ==================== */
.cta {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    padding: 5rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

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

.cta-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.cta h2 {
    font-size: 2rem;
    color: #fff;
    margin-bottom: 1rem;
}

.cta p {
    color: rgba(255,255,255,0.8);
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* ==================== Footer ==================== */
.footer {
    background: var(--dark);
    color: #94A3B8;
    padding: 4rem 0 2rem;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand h3 {
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-brand p {
    color: #94A3B8;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.footer-column {
    padding-left: 2rem;
}

.footer-title {
    color: var(--accent);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    position: relative;
    display: inline-block;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    color: #94A3B8;
    font-size: 0.9rem;
}

.footer-contact-item svg {
    width: 18px;
    height: 18px;
    stroke: var(--accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.footer-contact-item a {
    color: #94A3B8;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-contact-item a:hover {
    color: var(--accent);
}

.footer-bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    padding-top: 1.5rem;
    font-size: 0.85rem;
    color: #64748B;
}

.footer-bottom p {
    color: #64748B;
    text-align: center;
}

/* ==================== Responsive Design ==================== */
@media (max-width: 1024px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-top {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .header-inner {
        height: 70px;
    }
    
    .nav {
        display: none;
    }
    
    .hero h1,
    .slide-content h1 {
        font-size: 2.5rem;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        gap: 2rem;
    }
    
    .contact-card {
        padding: 2rem;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-column {
        padding-left: 0;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .hero {
        height: 350px;
    }
    
    .slider-arrow {
        display: none;
    }
}