/* Petra-Flow - Unique Industrial Design System */

/* ================================
   RESET & BASE STYLES
   ================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Industrial Green & Dark Gray */
    --primary-green: #2d7a4f;
    --primary-green-dark: #1f5838;
    --primary-green-light: #3a9961;
    --dark-gray: #1a1f2e;
    --medium-gray: #2c3547;
    --light-gray: #e8eaed;
    --text-dark: #1a1f2e;
    --text-medium: #4a5568;
    --text-light: #718096;
    --white: #ffffff;
    --overlay-dark: rgba(26, 31, 46, 0.75);
    
    /* Typography */
    --font-main: 'Poppins', sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-semibold: 600;
    
    /* Spacing */
    --section-padding: 80px 0;
    --container-max: 1200px;
    
    /* Effects */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    font-weight: var(--font-weight-normal);
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--white);
    overflow-x: hidden;
}

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

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

/* ================================
   TYPOGRAPHY
   ================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

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: 1.25rem;
    color: var(--text-medium);
    font-size: 1rem;
}

/* ================================
   LAYOUT CONTAINERS
   ================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: var(--section-padding);
}

.section-alt {
    background-color: var(--light-gray);
}

/* ================================
   HEADER & NAVIGATION
   ================================ */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

header.scrolled {
    box-shadow: var(--shadow-md);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 0;
}

.logo {
    font-size: 1.75rem;
    font-weight: var(--font-weight-semibold);
    color: var(--dark-gray);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: bold;
    font-size: 1.25rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

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

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

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

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

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-dark);
    cursor: pointer;
}

/* ================================
   HERO SECTION (UNIQUE DESIGN)
   ================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 76px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
}

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

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        rgba(26, 31, 46, 0.85) 0%, 
        rgba(45, 122, 79, 0.65) 100%);
    z-index: -1;
}

.hero-content {
    text-align: center;
    color: var(--white);
    max-width: 900px;
    padding: 2rem;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    color: var(--white);
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    color: var(--light-gray);
    margin-bottom: 2.5rem;
    font-weight: var(--font-weight-light);
}

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

/* ================================
   BUTTONS
   ================================ */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: var(--radius);
    font-weight: var(--font-weight-semibold);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary-green);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--primary-green-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--white);
    color: var(--primary-green);
}

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

.btn-outline:hover {
    background: var(--primary-green);
    color: var(--white);
}

/* ================================
   FEATURE CARDS (UNIQUE LAYOUT)
   ================================ */
.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 3rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-green), var(--primary-green-light));
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-green);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--white);
    font-size: 2rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-medium);
    line-height: 1.8;
}

/* ================================
   CONTENT SECTIONS
   ================================ */
.content-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.content-text h2 {
    margin-bottom: 1.5rem;
}

.content-text p {
    margin-bottom: 1.5rem;
}

.content-image {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.content-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.content-image:hover img {
    transform: scale(1.05);
}

/* ================================
   STATISTICS (UNIQUE DESIGN)
   ================================ */
.stats-section {
    background: linear-gradient(135deg, var(--dark-gray) 0%, var(--medium-gray) 100%);
    color: var(--white);
    padding: 80px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 3rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
}

.stat-number {
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: var(--font-weight-semibold);
    color: var(--primary-green-light);
    line-height: 1;
    margin-bottom: 0.5rem;
    display: block;
}

.stat-label {
    font-size: 1.1rem;
    color: var(--light-gray);
    font-weight: var(--font-weight-light);
}

/* ================================
   CALL TO ACTION
   ================================ */
.cta-section {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-green-dark) 100%);
    color: var(--white);
    text-align: center;
    padding: 80px 20px;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
}

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

.cta-content h2 {
    color: var(--white);
    margin-bottom: 1.5rem;
}

.cta-content p {
    color: var(--light-gray);
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

/* ================================
   BLOG CARDS
   ================================ */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2.5rem;
}

.blog-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

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

.blog-image {
    height: 240px;
    overflow: hidden;
}

.blog-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.blog-content {
    padding: 2rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.blog-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.blog-content h3 {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.blog-excerpt {
    color: var(--text-medium);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.blog-link {
    color: var(--primary-green);
    font-weight: var(--font-weight-semibold);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.blog-link:hover {
    color: var(--primary-green-dark);
}

/* ================================
   BLOG ARTICLE
   ================================ */
.article-header {
    max-width: 900px;
    margin: 0 auto 3rem;
    text-align: center;
}

.article-meta {
    display: flex;
    gap: 2rem;
    justify-content: center;
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.article-image {
    width: 100%;
    height: 500px;
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-md);
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
}

.article-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 1.5rem;
}

.article-content h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.article-content ul, 
.article-content ol {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

.article-content li {
    margin-bottom: 0.75rem;
    color: var(--text-medium);
}

/* ================================
   CONTACT FORM
   ================================ */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-green);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.contact-details h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.contact-details p {
    color: var(--text-medium);
}

.contact-form {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-dark);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--light-gray);
    border-radius: var(--radius);
    font-family: var(--font-main);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-green);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.map-container {
    margin-top: 4rem;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    height: 400px;
}

.map-container iframe {
    width: 100%;
    height: 100%;
    border: 0;
}

/* ================================
   FAQ
   ================================ */
.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.5rem 2rem;
    background: none;
    border: none;
    text-align: left;
    font-family: var(--font-main);
    font-size: 1.1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-green);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--primary-green);
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer-content {
    padding: 0 2rem 1.5rem;
    color: var(--text-medium);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

/* ================================
   FOOTER
   ================================ */
footer {
    background: var(--dark-gray);
    color: var(--light-gray);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h3 {
    color: var(--white);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.footer-section p,
.footer-section a {
    color: var(--light-gray);
    margin-bottom: 0.75rem;
    display: block;
}

.footer-section a:hover {
    color: var(--primary-green-light);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--medium-gray);
    color: var(--text-light);
}

/* ================================
   COOKIE BANNER
   ================================ */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--dark-gray);
    color: var(--white);
    padding: 1.5rem;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    transform: translateY(100%);
    transition: var(--transition);
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-content {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.cookie-text {
    flex: 1;
}

.cookie-text p {
    color: var(--light-gray);
    margin-bottom: 0;
}

.cookie-text a {
    color: var(--primary-green-light);
    text-decoration: underline;
}

.cookie-buttons {
    display: flex;
    gap: 1rem;
}

.btn-small {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
}

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

.fade-in {
    animation: fadeInUp 0.8s ease-out;
}

/* ================================
   RESPONSIVE DESIGN
   ================================ */
@media (max-width: 1024px) {
    .content-section {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 76px;
        left: -100%;
        flex-direction: column;
        width: 100%;
        background: var(--white);
        padding: 2rem;
        box-shadow: var(--shadow-md);
        transition: var(--transition);
        gap: 1rem;
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .cookie-content {
        flex-direction: column;
        text-align: center;
    }
    
    .cookie-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .cookie-buttons .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    :root {
        --section-padding: 50px 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-content {
        padding: 1rem;
    }
    
    .feature-card,
    .blog-card,
    .contact-form {
        padding: 1.5rem;
    }
}