/* GLOBAL SOURCE TRADING - Main Stylesheet */

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

/* CSS Variables for Consistent Design System */
:root {
    /* Primary Colors */
    --primary-500: #0057B7;
    --primary-700: #00438E;
    --primary-100: #E6F0F8;
    
    /* Neutral Colors */
    --neutral-900: #111827;
    --neutral-600: #4B5563;
    --neutral-400: #9CA3AF;
    --neutral-200: #E5E7EB;
    --neutral-100: #F3F4F6;
    --neutral-0: #FFFFFF;
    
    /* Semantic Colors */
    --success-500: #10B981;
    --warning-500: #F59E0B;
    --error-500: #EF4444;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-xxl: 64px;
    --space-xxxl: 96px;
    
    /* Layout */
    --container-max-width: 1280px;
    --border-radius: 12px;
    --header-height: 70px;
}

/* Base Typography and Body Styles */
body {
    font-family: var(--font-family);
    background-color: var(--neutral-100);
    color: var(--neutral-900);
    line-height: 1.6;
    scroll-behavior: smooth;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

/* Header and Navigation */
.header {
    background: var(--neutral-0);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) 0;
    min-height: var(--header-height);
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-500);
    text-decoration: none;
    transition: color 0.3s ease;
}

.logo:hover {
    color: var(--primary-700);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
}

.nav-links a {
    text-decoration: none;
    color: var(--neutral-900);
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    color: var(--primary-500);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-500);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links a.active {
    color: var(--primary-500);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--space-xs);
}

.mobile-menu span {
    width: 24px;
    height: 3px;
    background: var(--neutral-900);
    margin: 2px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn-primary {
    background: var(--primary-500);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 87, 183, 0.25);
}

.btn-primary:hover {
    background: var(--primary-700);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 87, 183, 0.35);
}

.btn-secondary {
    background: var(--neutral-0);
    color: var(--neutral-900);
    border: 1px solid var(--neutral-200);
}

.btn-secondary:hover {
    background: var(--neutral-100);
    border-color: var(--primary-500);
    color: var(--primary-500);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--neutral-100) 0%, var(--neutral-200) 100%);
    padding: calc(var(--header-height) + var(--space-xxl)) 0 var(--space-xxl);
    text-align: center;
    position: relative;
    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"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23E5E7EB" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
    z-index: 0;
}

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

.hero h1 {
    font-size: 60px;
    font-weight: 700;
    line-height: 1.1;
    color: var(--neutral-900);
    margin-bottom: var(--space-md);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero p {
    font-size: 20px;
    color: var(--neutral-600);
    margin-bottom: var(--space-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Section Styles */
.section {
    padding: var(--space-xxxl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-xxl);
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--neutral-900);
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    font-size: 18px;
    color: var(--neutral-600);
    max-width: 600px;
    margin: 0 auto;
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.service-card {
    background: var(--neutral-0);
    padding: var(--space-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0, 87, 183, 0.08);
    transition: all 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-700));
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px rgba(0, 87, 183, 0.15);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-md);
    background: var(--primary-100);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-500);
}

.service-card h3 {
    font-size: 28px;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--space-sm);
    color: var(--neutral-900);
}

.service-card p {
    font-size: 16px;
    color: var(--neutral-600);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.service-features {
    list-style: none;
    text-align: left;
}

.service-features li {
    padding: var(--space-xs) 0;
    position: relative;
    padding-left: var(--space-md);
    color: var(--neutral-600);
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-500);
    font-weight: bold;
}

/* About Section */
.about {
    background: var(--neutral-0);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xxl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.about-text h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--neutral-900);
    margin-bottom: var(--space-md);
}

.about-text p {
    font-size: 18px;
    color: var(--neutral-600);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

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

.stat-item {
    text-align: center;
    padding: var(--space-md);
    background: var(--neutral-100);
    border-radius: var(--border-radius);
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-500);
    display: block;
}

.stat-label {
    font-size: 14px;
    color: var(--neutral-600);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.about-image {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 87, 183, 0.12);
}

.about-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    opacity: 0.1;
    z-index: 1;
}

/* Contact Section */
.contact {
    background: var(--neutral-0);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xxl);
    max-width: 1200px;
    margin: 0 auto;
}

.contact-form {
    background: var(--neutral-0);
    padding: var(--space-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--neutral-200);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 600;
    color: var(--neutral-900);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--space-sm);
    border: 1px solid var(--neutral-200);
    border-radius: var(--border-radius);
    font-size: 16px;
    font-family: var(--font-family);
    transition: all 0.3s ease;
    background: var(--neutral-0);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(0, 87, 183, 0.1);
}

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

.contact-info {
    padding: var(--space-lg) 0;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background: var(--neutral-100);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.contact-item:hover {
    background: var(--primary-100);
    transform: translateX(4px);
}

.contact-icon {
    width: 24px;
    height: 24px;
    margin-right: var(--space-md);
    color: var(--primary-500);
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 16px;
    color: var(--neutral-600);
    line-height: 1.5;
}

.contact-item a {
    color: var(--primary-500);
    text-decoration: none;
}

.contact-item a:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    background: var(--neutral-900);
    color: white;
    text-align: center;
    padding: var(--space-xl) 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-500);
    margin-bottom: var(--space-sm);
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
    margin-bottom: var(--space-sm);
}

.footer-links a {
    color: var(--neutral-400);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--primary-500);
}

.footer p {
    font-size: 14px;
    color: var(--neutral-400);
}

/* Page-Specific Styles */
.page-hero {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    color: white;
    padding: calc(var(--header-height) + var(--space-xxl)) 0 var(--space-xl);
    text-align: center;
    margin-top: var(--header-height);
}

.page-hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.page-hero p {
    font-size: 20px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.content-section {
    padding: var(--space-xxxl) 0;
}

.content-section:nth-child(even) {
    background: var(--neutral-100);
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.feature-item {
    background: var(--neutral-0);
    padding: var(--space-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.feature-item h4 {
    font-size: 20px;
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--space-sm);
}

.feature-item p {
    color: var(--neutral-600);
    line-height: 1.6;
}

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

.animate-on-scroll {
    animation: fadeInUp 0.6s ease-out;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 48px;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .contact-content,
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu {
        display: flex;
    }

    .hero {
        padding: calc(var(--header-height) + var(--space-xl)) 0 var(--space-lg);
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 18px;
    }

    .section-title {
        font-size: 36px;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .service-card {
        padding: var(--space-md);
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }

    .contact-form {
        padding: var(--space-md);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .page-hero h1 {
        font-size: 32px;
    }

    .page-hero p {
        font-size: 18px;
    }

    .feature-list {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
}

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

    .hero h1 {
        font-size: 28px;
    }

    .section-title {
        font-size: 28px;
    }

    .service-card h3 {
        font-size: 22px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .mobile-menu {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}