/* ========================================
   yugojuzureso - Modern Oil & Logistics Website
   2025 Design System
   ======================================== */

/* CSS Variables - Design Tokens */
:root {
    /* Color Palette - Dark petroleum theme with modern accents */
    --primary-dark: #0a1628;
    --primary-blue: #1a3a52;
    --accent-gold: #d4af37;
    --accent-orange: #ff6b35;
    --neutral-white: #ffffff;
    --neutral-light: #f5f7fa;
    --neutral-gray: #8892a6;
    --text-dark: #1e293b;
    --text-light: #64748b;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-headings: 'Segoe UI', system-ui, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;
    
    /* Shadows - Soft, layered 2025 style */
    --shadow-sm: 0 2px 8px rgba(10, 22, 40, 0.04);
    --shadow-md: 0 4px 16px rgba(10, 22, 40, 0.08);
    --shadow-lg: 0 12px 32px rgba(10, 22, 40, 0.12);
    --shadow-xl: 0 24px 48px rgba(10, 22, 40, 0.16);
    
    /* Border Radius - Smooth modern curves */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--neutral-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-fast);
}

ul {
    list-style: none;
}

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

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-headings);
    font-weight: 700;
    line-height: 1.2;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

strong {
    font-weight: 600;
    color: var(--text-dark);
}

/* ========================================
   Layout Utilities
   ======================================== */

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-2xl) 0;
}

/* ========================================
   Header & Navigation
   ======================================== */

header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-md);
    max-width: 1280px;
    margin: 0 auto;
}

.logo a {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary-dark);
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    position: relative;
}

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

.nav-menu a {
    font-weight: 500;
    color: var(--text-dark);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent-gold);
    transition: var(--transition-fast);
}

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

.nav-menu a:hover::after {
    width: 80%;
}

.contact-link {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-dark));
    color: var(--neutral-white) !important;
    padding: var(--spacing-xs) var(--spacing-md) !important;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

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

.contact-link::after {
    display: none;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 28px;
    height: 3px;
    background: var(--primary-dark);
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* ========================================
   Hero Sections
   ======================================== */

.hero {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
    color: var(--neutral-white);
    padding: var(--spacing-2xl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.05));
    pointer-events: none;
}

.hero-content {
    max-width: 700px;
    position: relative;
    z-index: 2;
    animation: fadeInUp 0.8s ease;
}

.hero h1 {
    color: var(--neutral-white);
    margin-bottom: var(--spacing-md);
}

.hero p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.hero-image {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 45%;
    opacity: 0.15;
    z-index: 1;
}

.hero-image img {
    width: 100%;
    border-radius: var(--radius-xl);
}

.page-hero {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-dark));
    padding: var(--spacing-xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-hero::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 100px;
    background: var(--neutral-white);
    border-radius: 50%;
}

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

.page-hero h1,
.page-hero p {
    color: var(--neutral-white);
}

.page-hero img {
    margin: var(--spacing-lg) auto 0;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 800px;
}

/* ========================================
   Buttons & CTAs
   ======================================== */

.cta-button,
.submit-btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-orange));
    color: var(--neutral-white);
    font-weight: 600;
    font-size: 1.125rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    border: none;
    cursor: pointer;
}

.cta-button:hover,
.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   Grid Systems
   ======================================== */

.services-grid,
.team-grid,
.features-grid,
.products-grid,
.solutions-list,
.areas-grid,
.benefits-grid,
.infra-grid,
.sources-list,
.cert-list,
.values-grid,
.cases-grid,
.contact-info-grid,
.hours-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

/* ========================================
   Cards
   ======================================== */

.service-card,
.product-card,
.solution-card,
.team-member,
.feature-item,
.area-card,
.benefit-item,
.infra-card,
.source-item,
.cert-item,
.value-item,
.case-card,
.contact-info-card,
.hours-card {
    background: var(--neutral-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    border: 1px solid rgba(10, 22, 40, 0.05);
}

.service-card:hover,
.product-card:hover,
.solution-card:hover,
.team-member:hover,
.case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-gold);
}

.service-card img,
.product-card img,
.solution-card img,
.team-member img,
.feature-item img,
.area-card img,
.benefit-item img,
.infra-card img,
.source-item img,
.cert-item img,
.case-card img,
.contact-info-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.service-card h3,
.product-card h3,
.solution-card h3,
.team-member h3,
.feature-item h3,
.case-card h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.service-card ul,
.product-card ul,
.solution-card ul {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-md);
}

.service-card ul li,
.product-card ul li,
.solution-card ul li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    color: var(--text-light);
}

.service-card ul li::before,
.product-card ul li::before,
.solution-card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-gold);
    font-weight: 700;
}

.service-pricing,
.product-price,
.solution-pricing {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(10, 22, 40, 0.1);
}

.service-pricing span,
.product-price,
.solution-pricing {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-orange);
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* ========================================
   Stats Section
   ======================================== */

.stats {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-dark));
    color: var(--neutral-white);
}

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

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--accent-gold);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
}

/* ========================================
   Process Section
   ======================================== */

.process-steps,
.implementation-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.process-step,
.impl-step {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--neutral-light);
    border-radius: var(--radius-lg);
    position: relative;
}

.process-step img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.step-number {
    display: inline-block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-orange));
    color: var(--neutral-white);
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
}

/* ========================================
   Timeline
   ======================================== */

.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--accent-gold), var(--primary-blue));
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-xl);
    padding-left: var(--spacing-lg);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -28px;
    top: 0;
    width: 16px;
    height: 16px;
    background: var(--accent-gold);
    border: 4px solid var(--neutral-white);
    border-radius: 50%;
    box-shadow: var(--shadow-md);
}

.timeline-date {
    display: inline-block;
    background: var(--primary-blue);
    color: var(--neutral-white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.timeline-item img {
    width: 100%;
    max-width: 600px;
    height: 300px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    margin: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
}

/* ========================================
   Reviews Section
   ======================================== */

.reviews {
    background: var(--neutral-light);
}

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

.review-card {
    background: var(--neutral-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--accent-gold);
}

.review-text {
    font-style: italic;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.review-author {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.review-author strong {
    color: var(--primary-blue);
}

.review-author span {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* ========================================
   FAQ Section
   ======================================== */

.faq,
.faq-page {
    background: var(--neutral-white);
}

.faq-list,
.faq-category {
    margin-top: var(--spacing-lg);
}

.faq-category h3 {
    color: var(--primary-blue);
    margin: var(--spacing-xl) 0 var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--accent-gold);
}

.faq-item {
    background: var(--neutral-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--accent-gold);
}

.faq-item h3,
.faq-item h4 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.faq-item p {
    color: var(--text-light);
    line-height: 1.8;
}

/* ========================================
   Contact Form
   ======================================== */

.contact-form-section {
    background: var(--neutral-light);
}

.form-wrapper {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    align-items: start;
}

#contact-form {
    background: var(--neutral-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid rgba(10, 22, 40, 0.1);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-gold);
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.form-group.checkbox {
    display: flex;
    align-items: center;
}

.form-group.checkbox label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 400;
    margin: 0;
}

.form-group.checkbox input {
    width: auto;
    margin: 0;
}

.form-group.checkbox a {
    color: var(--primary-blue);
    text-decoration: underline;
}

.submit-btn {
    width: 100%;
    margin-top: var(--spacing-md);
}

.form-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* ========================================
   CTA Section
   ======================================== */

.cta-section {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-dark));
    color: var(--neutral-white);
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.cta-section h2 {
    color: var(--neutral-white);
    margin-bottom: var(--spacing-md);
}

.cta-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

/* ========================================
   Footer
   ======================================== */

footer {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xl);
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3,
.footer-section h4 {
    color: var(--accent-gold);
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition-fast);
}

.footer-section a:hover {
    color: var(--accent-gold);
    padding-left: 5px;
}

.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

/* ========================================
   Pricing Table
   ======================================== */

.pricing-table {
    background: var(--neutral-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-top: var(--spacing-xl);
}

.pricing-row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid rgba(10, 22, 40, 0.05);
}

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

.pricing-row:hover {
    background: var(--neutral-light);
}

.pricing-service {
    font-weight: 500;
    color: var(--text-dark);
}

.pricing-price {
    font-weight: 700;
    color: var(--accent-orange);
    text-align: right;
}

.pricing-note {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--neutral-light);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-light);
}

/* ========================================
   Policies Placeholder
   ======================================== */

.policies-container {
    min-height: 400px;
    padding: var(--spacing-2xl) var(--spacing-md);
}

/* ========================================
   Map Section
   ======================================== */

.map-placeholder {
    margin-top: var(--spacing-lg);
}

.map-placeholder img {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.map-note {
    text-align: center;
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text-light);
}

/* ========================================
   Response Time / Emergency
   ======================================== */

.response-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.response-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--neutral-light);
    border-radius: var(--radius-lg);
}

.response-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.emergency-box {
    background: var(--accent-orange);
    color: var(--neutral-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    margin: var(--spacing-lg) 0;
}

.emergency-box p {
    color: var(--neutral-white);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.emergency-box strong {
    color: var(--neutral-white);
    font-size: 1.5rem;
}

/* ========================================
   Animations
   ======================================== */

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

/* ========================================
   Responsive Design - Mobile First
   ======================================== */

@media (max-width: 768px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-2xl: 4rem;
    }
    
    /* Mobile Navigation */
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--neutral-white);
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .nav-menu a {
        display: block;
        padding: var(--spacing-md);
        border-bottom: 1px solid rgba(10, 22, 40, 0.05);
    }
    
    /* Hero */
    .hero {
        text-align: center;
    }
    
    .hero-image {
        display: none;
    }
    
    /* Grids */
    .services-grid,
    .team-grid,
    .features-grid,
    .products-grid,
    .solutions-list,
    .footer-container {
        grid-template-columns: 1fr;
    }
    
    /* Form */
    .form-wrapper {
        grid-template-columns: 1fr;
    }
    
    .form-image {
        display: none;
    }
    
    /* Timeline */
    .timeline {
        padding-left: var(--spacing-lg);
    }
    
    .timeline::before {
        left: 10px;
    }
    
    .timeline-item::before {
        left: -18px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .services-grid,
    .team-grid,
    .features-grid,
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-container {
        grid-template-columns: repeat(2, 1fr);
    }
}