/* ========================================
   YAMEDIYASASI - Modern 2025 Design
   Energy Products Trading Website
   ======================================== */

/* === CSS Variables === */
:root {
    /* Color Palette - Deep industrial with energy accents */
    --color-primary: #FF6B35;
    --color-primary-dark: #E85A28;
    --color-primary-light: #FF8559;
    --color-secondary: #004E89;
    --color-secondary-dark: #003A66;
    --color-secondary-light: #1A6BAA;
    --color-accent: #F7B32B;
    --color-accent-dark: #D99A1F;
    
    --color-dark: #1A1D29;
    --color-dark-lighter: #2C3142;
    --color-text: #2C3E50;
    --color-text-light: #6C757D;
    --color-text-lighter: #95A5A6;
    
    --color-bg: #FFFFFF;
    --color-bg-light: #F8F9FA;
    --color-bg-lighter: #F1F3F5;
    
    --color-border: #E1E8ED;
    --color-border-light: #ECF0F1;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Space Grotesk', 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows - 2025 soft depth */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

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

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
}

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: 1.25rem;
}

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

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

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

ul {
    list-style: none;
}

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

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: 0 4px 16px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 107, 53, 0.4);
    color: white;
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

/* === Header === */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo a {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    display: flex;
    align-items: center;
}

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

.nav-list a {
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    padding: 0.5rem 0;
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

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

.btn-contact {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white !important;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-dark);
    transition: all var(--transition-base);
    border-radius: 2px;
}

/* === Hero Section === */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 78, 137, 0.9), rgba(255, 107, 53, 0.8));
    z-index: 1;
}

.hero-background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: white;
    max-width: 800px;
}

.hero-content h1 {
    color: white;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.hero-content p {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

/* === Page Hero === */
.page-hero {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-dark));
    color: white;
    text-align: center;
}

.page-hero h1 {
    color: white;
}

.page-hero p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
}

/* === Section Styles === */
section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
}

.section-header h2 {
    margin-bottom: var(--spacing-md);
}

.section-header p {
    font-size: 1.125rem;
}

.section-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
}

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

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

.feature-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.feature-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

/* === Services Section === */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.service-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.service-card img {
    width: 100%;
    height: 240px;
    object-fit: cover;
}

.service-content {
    padding: var(--spacing-lg);
}

.service-content h3 {
    margin-bottom: var(--spacing-md);
}

.service-content p {
    margin-bottom: var(--spacing-md);
}

.service-content ul {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-md);
}

.service-content li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
}

.service-content li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.service-card span {
    display: inline-block;
    margin-top: var(--spacing-md);
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    font-weight: 600;
    border-radius: var(--radius-sm);
}

/* === Process Section === */
.process-section {
    background: var(--color-bg-light);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.process-step {
    position: relative;
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

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

.step-number {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.process-step h3 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

/* === Stats Section === */
.stats-section {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-dark));
    color: white;
}

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

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-heading);
}

.stat-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
}

/* === Reviews Section === */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.review-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--color-primary);
}

.review-content {
    margin-bottom: var(--spacing-lg);
}

.review-content p {
    font-style: italic;
    color: var(--color-text);
}

.review-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.review-author img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    font-weight: 600;
    color: var(--color-dark);
}

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

/* === CTA Section === */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

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

.cta-section p {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
}

.cta-section .btn-primary {
    background: white;
    color: var(--color-primary);
}

.cta-section .btn-primary:hover {
    background: var(--color-bg-light);
}

/* === Contact Form === */
.contact-form-section {
    background: var(--color-bg-light);
}

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

.form-intro h2 {
    margin-bottom: var(--spacing-md);
}

.form-info-box {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-top: var(--spacing-lg);
}

.form-info-box h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.form-info-box ul {
    padding-left: var(--spacing-md);
}

.form-info-box li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
}

.form-info-box li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.form-container {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

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

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

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

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

.checkbox-group {
    display: flex;
    align-items: start;
    gap: var(--spacing-sm);
}

.checkbox-label {
    display: flex;
    align-items: start;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin-top: 0.25rem;
    cursor: pointer;
}

.btn-submit {
    width: 100%;
    padding: 1rem;
    font-size: 1.125rem;
    margin-top: var(--spacing-md);
}

.form-note {
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--color-text-lighter);
}

/* === Contact Methods === */
.contact-methods-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.contact-method-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform var(--transition-base);
}

.contact-method-card:hover {
    transform: translateY(-4px);
}

.method-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.contact-method-card h3 {
    margin-bottom: var(--spacing-md);
}

/* === Footer === */
.site-footer {
    background: var(--color-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-col h3,
.footer-col h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-about p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-policies ul,
.contact-list {
    list-style: none;
}

.footer-policies li,
.contact-list li {
    margin-bottom: var(--spacing-sm);
}

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

.footer-policies a:hover,
.contact-list a:hover {
    color: var(--color-primary);
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.contact-list svg {
    flex-shrink: 0;
    opacity: 0.7;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
}

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

/* === Additional Page Layouts === */
.content-layout {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.content-text h2 {
    margin-bottom: var(--spacing-md);
}

.content-image {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.content-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.timeline {
    margin-top: var(--spacing-xl);
}

.timeline-item {
    position: relative;
    padding-left: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-left: 2px solid var(--color-primary);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -8px;
    top: 0;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 3px solid white;
    box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline-date {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--color-primary);
    color: white;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.timeline-item h3 {
    margin-bottom: var(--spacing-sm);
}

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

.team-member {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.team-member:hover {
    transform: translateY(-4px);
}

.team-member img {
    width: 100%;
    height: 280px;
    object-fit: cover;
}

.team-member h3 {
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-sm);
    margin-bottom: 0;
}

.team-member p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    font-size: 0.9375rem;
}

/* === FAQ Section === */
.faq-category {
    margin-bottom: var(--spacing-2xl);
}

.category-title {
    color: var(--color-dark);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 3px solid var(--color-primary);
}

.faq-item {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--color-primary);
}

.faq-question {
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.faq-answer p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

/* === Policies Container === */
.policies-container {
    max-width: 900px;
    margin: var(--spacing-2xl) auto;
    padding: var(--spacing-xl);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* === Responsive Design === */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-about {
        grid-column: 1 / -1;
    }
    
    .form-layout {
        grid-template-columns: 1fr;
    }
    
    .content-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-2xl: 4rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 350px;
        height: 100vh;
        background: white;
        box-shadow: var(--shadow-xl);
        transition: right var(--transition-base);
        padding: 100px var(--spacing-lg) var(--spacing-lg);
    }
    
    .main-nav.active {
        right: 0;
    }
    
    .nav-list {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
    
    .nav-list a {
        font-size: 1.125rem;
        display: block;
        width: 100%;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-actions .btn {
        width: 100%;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .features-grid,
    .services-grid,
    .process-steps,
    .reviews-grid,
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* === Utility Classes === */
.alt-layout .content-layout {
    grid-template-columns: 1fr;
}

@media (min-width: 769px) {
    .alt-layout .content-layout {
        grid-template-columns: 1fr 1.5fr;
    }
    
    .alt-layout .service-detail-image {
        order: 2;
    }
}