/* ===========================================
   HEI - Heat Exchangers International Limited
   Professional Website Styles
   =========================================== */

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

:root {
    /* Primary Colors */
    --primary-color: #0066cc;
    --primary-dark: #004999;
    --primary-light: #0099ff;
    --accent-color: #00ccff;

    /* Navbar Colors */
    --navbar-dark: #0a1628;
    --navbar-mid: #132744;
    --navbar-light: #1a3a5c;

    /* Text Colors */
    --text-dark: #1a1a2e;
    --text-medium: #4a4a5a;
    --text-light: #6b7280;
    --text-muted: #9ca3af;

    /* Background Colors */
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --bg-dark: #0f172a;

    /* Utility */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

    /* Spacing */
    --section-padding: 100px;
    --container-max-width: 1200px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    overflow-x: hidden;
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', 'Poppins', sans-serif;
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.2;
    color: var(--text-dark);
}

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

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===========================================
   NAVIGATION
   =========================================== */
.navbar {
    background: linear-gradient(135deg, var(--navbar-dark) 0%, var(--navbar-mid) 50%, var(--navbar-light) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-smooth);
}

.navbar.scrolled {
    background: rgba(10, 22, 40, 0.98);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 24px;
    max-width: 1600px;
}

.logo {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo::before {
    content: '';
    position: absolute;
    left: -16px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 40px;
    background: linear-gradient(180deg, var(--primary-light), var(--accent-color));
    border-radius: 2px;
    box-shadow: 0 0 20px rgba(0, 153, 255, 0.4);
}

.logo h1 {
    color: #ffffff;
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: 4px;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1rem;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    transition: all var(--transition-normal);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    position: relative;
    text-transform: uppercase;
}

.nav-links a:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
}

.nav-links a.active {
    color: var(--accent-color);
    background: rgba(0, 204, 255, 0.1);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 6px;
    padding: 8px;
}

.hamburger span {
    width: 26px;
    height: 2px;
    background: #ffffff;
    transition: all var(--transition-normal);
    border-radius: 2px;
}

/* ===========================================
   HERO SLIDER
   =========================================== */
.hero-slider {
    position: relative;
    margin: 0;
    padding: 0 !important;
    overflow: hidden;
}

.slider-container {
    position: relative;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    margin: 0;
    padding: 0;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 2s ease-in-out;
    z-index: 1;
}

.slide.active {
    opacity: 1;
    z-index: 2;
}

.slide-bg {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transform: scale(1.05);
    transition: transform 8s ease-out;
}

.slide.active .slide-bg {
    transform: scale(1);
}

.slide-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(10, 22, 40, 0.85) 0%,
        rgba(10, 22, 40, 0.7) 50%,
        rgba(10, 22, 40, 0.6) 100%
    );
    display: flex;
    align-items: center;
}

.slide-overlay::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(to top, rgba(10, 22, 40, 0.9), transparent);
}

.slide-content {
    position: relative;
    z-index: 3;
    max-width: 1200px;
    color: #ffffff;
    padding: 0 80px;
}

.slide-content h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    color: #ffffff;
    text-shadow: 0 2px 40px rgba(0, 0, 0, 0.3);
    letter-spacing: -0.02em;
}

.slide-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
}

/* Slider Controls */
.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #ffffff;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    cursor: pointer;
    z-index: 10;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
}

.slider-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-50%) scale(1.05);
}

.slider-btn.prev { left: 40px; }
.slider-btn.next { right: 40px; }

/* Slider Indicators */
.slider-indicators {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 10;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.3);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.indicator:hover {
    background: rgba(255, 255, 255, 0.5);
}

.indicator.active {
    background: #ffffff;
    width: 40px;
    border-radius: 6px;
}

/* ===========================================
   SECTION STYLES
   =========================================== */
section {
    padding: var(--section-padding) 0;
}

.section-title {
    font-size: 2.75rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-dark);
    position: relative;
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.125rem;
    max-width: 1000px;
    margin: 0 auto 4rem;
    line-height: 1.8;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    margin: 24px auto 0;
    border-radius: 2px;
}

/* ===========================================
   ABOUT SECTION
   =========================================== */
.about {
    background: var(--bg-white);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-medium);
    margin-bottom: 1.5rem;
    line-height: 1.9;
}

.about-text p:first-child::first-letter {
    font-size: 3.5rem;
    font-weight: 700;
    float: left;
    line-height: 1;
    margin-right: 12px;
    color: var(--primary-color);
}

.about-image {
    position: relative;
}

.about-image::before {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100%;
    height: 100%;
    border: 3px solid var(--primary-light);
    border-radius: var(--radius-lg);
    z-index: 0;
    opacity: 0.3;
}

.about-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    object-fit: cover;
    position: relative;
    z-index: 1;
    transition: transform var(--transition-smooth);
}

.about-img:hover {
    transform: translateY(-8px);
}

/* ===========================================
   ACTIVITIES SECTION
   =========================================== */
.activities {
    background: var(--bg-light);
    position: relative;
}

.activities::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.activities-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.activity-card {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-smooth);
    border: 1px solid var(--border-light);
    position: relative;
}

.activity-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.activity-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-full);
    color: #ffffff;
    font-size: 2rem;
}

.activity-card h3 {
    font-size: 1.25rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.activity-card p {
    color: var(--text-medium);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* ===========================================
   PRODUCTS SECTION
   =========================================== */
.products {
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-white) 100%);
    position: relative;
    overflow: hidden;
}

.products::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.products .container {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    padding: 0 24px;
}

.products-slider-container {
    position: relative;
    display: flex;
    align-items: center;
    gap: 2rem;
    margin: 0 auto;
}

.products-slider-wrapper {
    flex: 1;
    overflow: hidden;
    position: relative;
    padding: 20px 0;
}

.products-slider {
    display: flex;
    gap: 2rem;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.products-slider .product-card {
    flex: 0 0 calc((100% - 4rem) / 3);
    min-width: 0;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-smooth);
    text-align: center;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-light);
}

.product-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.product-card:hover::after {
    transform: scaleX(1);
}

.product-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.product-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    position: relative;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.product-card h3 {
    font-size: 1.125rem;
    color: var(--text-dark);
    margin: 0;
    font-weight: 700;
    padding: 1.25rem 1.5rem 0.75rem;
    position: relative;
}

.product-card p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 0.9rem;
    padding: 0 1.5rem 2.5rem;
    margin: 0;
}

/* Products Slider Controls */
.products-slider-btn {
    flex-shrink: 0;
    background: var(--primary-color);
    color: #ffffff;
    border: none;
    width: 52px;
    height: 52px;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.products-slider-btn:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: scale(1.08);
}

.products-slider-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ===========================================
   INDUSTRIES SECTION
   =========================================== */
.industries {
    background: var(--bg-light);
    position: relative;
}

.industries::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.industries-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.industry-card {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-smooth);
    border: 1px solid var(--border-light);
    position: relative;
}

.industry-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.industry-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-full);
    color: #ffffff;
    font-size: 2rem;
}

.industry-card h3 {
    font-size: 1.25rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.industry-card p {
    color: var(--text-medium);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* ===========================================
   QUOTE SECTION
   =========================================== */
.quote-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--navbar-dark) 100%);
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}

.quote-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.quote-text {
    font-size: 2.5rem;
    font-weight: 700;
    color: #ffffff;
    text-align: center;
    line-height: 1.4;
    margin: 0;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* ===========================================
   VALUES/EXPERTISE SECTION
   =========================================== */
.values {
    background: var(--bg-white);
    position: relative;
}

.values::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.value-card {
    padding: 2.5rem;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
    border: 1px solid transparent;
}

.value-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color), var(--primary-light));
    border-radius: 2px 0 0 2px;
}

.value-card:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-light);
    transform: translateY(-8px);
}

.value-number {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.3;
    margin-bottom: 1rem;
    line-height: 1;
}

.value-card h3 {
    font-size: 1.375rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.value-card p {
    color: var(--text-medium);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* ===========================================
   CERTIFICATIONS SECTION
   =========================================== */
.certifications {
    background: linear-gradient(135deg, var(--navbar-dark) 0%, var(--navbar-mid) 100%);
    position: relative;
}

.certifications .section-title {
    color: #ffffff;
}

.certifications .section-title::after {
    background: linear-gradient(90deg, var(--accent-color), var(--primary-light));
}

.certifications .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.certification-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    transition: all var(--transition-smooth);
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.certification-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--accent-color), var(--primary-light));
}

.certification-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-8px);
    border-color: rgba(255, 255, 255, 0.2);
}

.certification-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-color);
    opacity: 0.4;
    margin-bottom: 1rem;
    line-height: 1;
}

.certification-card h3 {
    font-size: 1.25rem;
    color: #ffffff;
    margin-bottom: 1rem;
}

.certification-card p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    font-size: 0.95rem;
}

.certifications-note {
    margin-top: 3rem;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--accent-color);
}

.certifications-note p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
    font-size: 1rem;
    margin: 0;
    text-align: center;
}

/* ===========================================
   SUSTAINABILITY SECTION
   =========================================== */
.sustainability {
    background: var(--bg-white);
    position: relative;
}

.sustainability::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.sustainability-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.sustainability-card {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    transition: all var(--transition-smooth);
    border: 1px solid #a5d6a7;
    position: relative;
    overflow: hidden;
}

.sustainability-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, #4caf50, #81c784);
}

.sustainability-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: #81c784;
}

.sustainability-number {
    font-size: 3rem;
    font-weight: 800;
    color: #4caf50;
    opacity: 0.4;
    margin-bottom: 1rem;
    line-height: 1;
}

.sustainability-card h3 {
    font-size: 1.25rem;
    color: #2e7d32;
    margin-bottom: 1rem;
}

.sustainability-card p {
    color: #558b2f;
    line-height: 1.7;
    font-size: 0.95rem;
}

/* ===========================================
   CONTACT SECTION
   =========================================== */
.contact {
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-white) 100%);
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.contact-info > p {
    color: var(--text-medium);
    margin-bottom: 2.5rem;
    line-height: 1.8;
    font-size: 1.1rem;
}

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

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-item strong {
    display: block;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
    font-size: 1rem;
    font-weight: 600;
}

.contact-item p {
    color: var(--text-medium);
    line-height: 1.6;
    font-size: 0.95rem;
}

.contact-item a {
    color: var(--text-medium);
    text-decoration: none;
    transition: color var(--transition-normal);
}

.contact-item a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Contact Form */
.contact-form {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-normal);
    background: var(--bg-light);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-white);
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
}

.contact-form .btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: #ffffff;
    padding: 16px 32px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 14px rgba(0, 102, 204, 0.3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-form .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 204, 0.4);
}

.contact-form .btn:active {
    transform: translateY(0);
}

/* ===========================================
   FOOTER
   =========================================== */
.footer {
    background: var(--bg-dark);
    color: #ffffff;
    padding: 5rem 0 2rem;
    position: relative;
}

.footer .container {
    max-width: 1600px;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light), var(--accent-color));
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-section h3 {
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
    color: #ffffff;
}

.footer-section h4 {
    font-size: 1.125rem;
    margin-bottom: 1.25rem;
    color: #ffffff;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.footer-section p strong {
    color: #ffffff;
    font-weight: 600;
}

.footer-section p a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all var(--transition-normal);
}

.footer-section p a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.footer-section ul {
    list-style: none;
}

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

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all var(--transition-normal);
    font-size: 0.95rem;
}

.footer-section ul li a:hover {
    color: var(--accent-color);
    padding-left: 8px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===========================================
   RESPONSIVE DESIGN
   =========================================== */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }

    .values-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }
}

/* Mobile Landscape & Tablet Portrait */
@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }

    .navbar .container {
        padding: 0.75rem 20px;
    }

    .logo::before {
        left: -12px;
        height: 32px;
        width: 3px;
    }

    .logo h1 {
        font-size: 1.25rem;
        letter-spacing: 2px;
    }

    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        left: -100%;
        top: 56px;
        flex-direction: column;
        background: linear-gradient(180deg, var(--navbar-dark) 0%, var(--navbar-mid) 100%);
        width: 100%;
        text-align: center;
        transition: left var(--transition-normal);
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
        padding: 1rem 0;
        gap: 0;
        z-index: 999;
    }

    .nav-links.active {
        left: 0;
    }

    .nav-links li {
        margin: 0;
    }

    .nav-links a {
        display: block;
        padding: 1rem 2rem;
        font-size: 1rem;
        color: rgba(255, 255, 255, 0.9);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        border-radius: 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
        background: rgba(0, 153, 255, 0.15);
        color: var(--accent-color);
    }

    .nav-links li:last-child a {
        border-bottom: none;
    }

    .slider-container {
        height: 100vh;
        height: 100dvh;
    }

    .slide-content {
        padding: 0 24px;
    }

    .slide-content h1 {
        font-size: 2rem;
    }

    .slide-content p {
        font-size: 1rem;
    }

    .slider-btn {
        width: 44px;
        height: 44px;
    }

    .slider-btn.prev { left: 16px; }
    .slider-btn.next { right: 16px; }

    .section-title {
        font-size: 2rem;
    }

    .quote-text {
        font-size: 1.75rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .about-text p:first-child::first-letter {
        font-size: 2.5rem;
    }

    .about-image::before {
        display: none;
    }

    .activities-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .activity-card {
        padding: 2rem;
    }

    .industries-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .industry-card {
        padding: 2rem;
    }

    .certifications-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .certification-card {
        padding: 1.75rem;
    }

    .certification-number {
        font-size: 2.5rem;
    }

    .sustainability-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .sustainability-card {
        padding: 1.75rem;
    }

    .sustainability-number {
        font-size: 2.5rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .products .container {
        padding: 0 16px;
    }

    .products-slider .product-card {
        flex: 0 0 calc((100% - 1rem) / 2);
    }

    .products-slider-container {
        gap: 1rem;
    }

    .products-slider-btn {
        width: 44px;
        height: 44px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        text-align: center;
    }
}

/* Mobile Portrait */
@media (max-width: 480px) {
    :root {
        --section-padding: 50px;
    }

    .navbar .container {
        padding: 0.6rem 16px;
    }

    .logo::before {
        left: -10px;
        height: 28px;
    }

    .logo h1 {
        font-size: 1.1rem;
        letter-spacing: 1px;
    }

    .hamburger span {
        width: 22px;
    }

    .nav-links {
        top: 50px;
    }

    .slider-container {
        height: 100vh;
        height: 100dvh;
    }

    .slide-content {
        padding: 0 20px;
    }

    .slide-content h1 {
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }

    .slide-content p {
        font-size: 0.9rem;
        line-height: 1.6;
    }

    .slider-btn {
        width: 40px;
        height: 40px;
    }

    .slider-btn.prev { left: 12px; }
    .slider-btn.next { right: 12px; }

    .section-title {
        font-size: 1.75rem;
    }

    .quote-section {
        padding: 3rem 0;
    }

    .quote-text {
        font-size: 1.35rem;
    }

    .products-slider .product-card {
        flex: 0 0 100%;
    }

    .products-slider-container {
        gap: 0.75rem;
    }

    .products-slider-btn {
        width: 40px;
        height: 40px;
    }

    .value-card {
        padding: 1.75rem;
    }

    .activities-grid {
        grid-template-columns: 1fr;
    }

    .activity-card {
        padding: 1.5rem;
    }

    .activity-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .industries-grid {
        grid-template-columns: 1fr;
    }

    .industry-card {
        padding: 1.5rem;
    }

    .industry-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .certifications-grid {
        grid-template-columns: 1fr;
    }

    .certification-card {
        padding: 1.5rem;
    }

    .certification-number {
        font-size: 2rem;
    }

    .certifications-note {
        padding: 1.5rem;
    }

    .sustainability-grid {
        grid-template-columns: 1fr;
    }

    .sustainability-card {
        padding: 1.5rem;
    }

    .sustainability-number {
        font-size: 2rem;
    }

    .contact-form {
        padding: 1.75rem;
    }
}