/* -------------------------------------------------------------
   TEKAY FLOORING SYSTEMS - PREMIUM CSS STYLESHEET
   Aesthetic: Architectural, Minimal, Understated Luxury
------------------------------------------------------------- */

/* 1. DESIGN SYSTEM & ROOT VARIABLES */
:root {
    --bg-primary: #FBFBFA;
    --bg-secondary: #F5F5F3;
    --color-dark: #151515;
    --color-gray-dark: #2A2A2A;
    --color-gray-muted: #666666;
    --color-gray-light: #E5E5E2;
    --color-accent: #A89F91; /* Architectural Muted Bronze/Taupe */
    --color-accent-light: #C4BCB0;
    
    --font-heading: 'Cormorant Garamond', serif;
    --font-body: 'Inter', sans-serif;
    
    --transition-smooth: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: all 1.2s cubic-bezier(0.16, 1, 0.3, 1);
    
    --header-height: 90px;
    --header-shrink-height: 70px;
}

/* 2. BASE RESET & INITIAL SETUP */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-primary);
    color: var(--color-gray-dark);
    font-family: var(--font-body);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    overflow-x: hidden;
    line-height: 1.62;
}

/* 3. MULTILINGUAL SWITCHER FUNCTIONALITY */
html[lang="tr"] .lang-en { display: none !important; }
html[lang="en"] .lang-tr { display: none !important; }
html[lang="tr"] .lang-en-only { display: none !important; }
html[lang="en"] .lang-tr-only { display: none !important; }

/* 4. TYPOGRAPHY & GENERAL COMPONENTS */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 400;
    letter-spacing: -0.01em;
    color: var(--color-dark);
}

p {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 0.95rem;
    color: var(--color-gray-muted);
}

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

ul {
    list-style: none;
}

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

.section-container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 4%;
}

.section-header {
    text-align: center;
    margin-bottom: 70px;
}

.section-subtitle {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    color: var(--color-accent);
    text-transform: uppercase;
    display: block;
    margin-bottom: 12px;
}

.section-title {
    font-size: 2.8rem;
    line-height: 1.2;
    margin-bottom: 20px;
    font-weight: 300;
}

.section-line {
    width: 40px;
    height: 1px;
    background-color: var(--color-accent);
    margin: 0 auto;
}

/* BUTTONS */
.btn-primary {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    padding: 16px 36px;
    background-color: transparent;
    color: #FFF;
    border: 1px solid rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
    z-index: 1;
    transition: var(--transition-fast);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #FFF;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: -1;
}

.btn-primary:hover {
    color: var(--color-dark);
    border-color: #FFF;
}

.btn-primary:hover::before {
    transform: scaleX(1);
    transform-origin: left;
}

/* Scroll Fade-In Animation */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* 5. MAIN NAVIGATION HEADER */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(251, 251, 250, 0.85);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(21, 21, 21, 0.05);
    z-index: 1000;
    transition: var(--transition-smooth);
}

.main-header.shrink {
    height: var(--header-shrink-height);
    background-color: rgba(251, 251, 250, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.02);
}

.header-container {
    height: 100%;
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 4%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 58px;
    width: auto;
    object-fit: contain;
    display: block;
    transition: var(--transition-smooth);
}

.main-header.shrink .logo-img {
    height: 45px;
}

.nav-menu ul {
    display: flex;
    gap: 32px;
}

.nav-menu a {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-gray-dark);
    padding: 8px 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--color-accent);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.nav-menu a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Language Button switcher styles */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.05em;
}

.lang-btn {
    background: none;
    border: none;
    color: var(--color-gray-muted);
    cursor: pointer;
    padding: 4px;
    transition: var(--transition-fast);
}

.lang-btn.active, .lang-btn:hover {
    color: var(--color-dark);
    font-weight: 600;
}

.lang-divider {
    color: var(--color-gray-light);
}

/* Mobile Nav Toggle Icon */
.mobile-nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 20px;
    height: 14px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.mobile-nav-toggle .bar {
    width: 100%;
    height: 1px;
    background-color: var(--color-dark);
    transition: var(--transition-fast);
}

/* 6. HERO SLIDER SECTION */
.hero-slider-section {
    position: relative;
    width: 100%;
    height: 90vh;
    min-height: 600px;
    background-color: var(--color-dark);
    overflow: hidden;
}

.slider-wrapper {
    width: 100%;
    height: 100%;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 0 8%;
    opacity: 0;
    pointer-events: none;
    transform: scale(1.04);
    transition: opacity 1.5s cubic-bezier(0.16, 1, 0.3, 1), transform 1.5s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1;
}

.slide.active {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
    z-index: 2;
}

.slide-content {
    max-width: 780px;
    color: #FFF;
    z-index: 3;
}

.slide-tag {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.3em;
    color: var(--color-accent-light);
    text-transform: uppercase;
    display: block;
    margin-bottom: 20px;
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.4s;
}

.slide-title {
    font-size: 4rem;
    line-height: 1.15;
    font-weight: 300;
    margin-bottom: 25px;
    transform: translateY(30px);
    opacity: 0;
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.6s;
}

.slide-desc {
    font-size: 1.1rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 40px;
    max-width: 580px;
    transform: translateY(30px);
    opacity: 0;
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.8s;
}

.slide-content .btn-primary {
    transform: translateY(30px);
    opacity: 0;
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1) 1s;
}

/* Animations for Active Slide Content */
.slide.active .slide-tag,
.slide.active .slide-title,
.slide.active .slide-desc,
.slide.active .btn-primary {
    transform: translateY(0);
    opacity: 1;
}

/* Slider Controls */
.slider-controls {
    position: absolute;
    bottom: 50px;
    right: 8%;
    display: flex;
    gap: 15px;
    z-index: 10;
}

.slider-control {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    color: #FFF;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition-fast);
}

.slider-control:hover {
    background-color: #FFF;
    color: var(--color-dark);
    border-color: #FFF;
}

/* Indicators */
.slider-indicators {
    position: absolute;
    bottom: 50px;
    left: 8%;
    display: flex;
    gap: 10px;
    z-index: 10;
}

.indicator {
    width: 30px;
    height: 2px;
    background-color: rgba(255, 255, 255, 0.25);
    cursor: pointer;
    transition: var(--transition-fast);
}

.indicator.active {
    background-color: #FFF;
    width: 50px;
}

/* 7. KURUMSAL / ABOUT SECTION */
.kurumsal-section {
    padding: 140px 0;
    border-bottom: 1px solid var(--color-gray-light);
}

.kurumsal-grid {
    display: grid;
    grid-template-columns: 1.1fr 1.9fr;
    gap: 80px;
    align-items: center;
}

.kurumsal-meta {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.kurumsal-meta .section-title {
    text-align: left;
    margin-top: 0;
}

.kurumsal-content .lead-text {
    font-size: 1.35rem;
    color: var(--color-dark);
    line-height: 1.5;
    margin-bottom: 25px;
    font-weight: 300;
}

.kurumsal-content p {
    margin-bottom: 20px;
    text-align: justify;
}

/* 8. ÜRÜNLER SECTION (10-ITEM GRID) */
.urunler-section {
    padding: 120px 0;
    background-color: var(--bg-primary);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    row-gap: 60px;
}

/* Product Card Design */
.product-card {
    display: flex;
    flex-direction: column;
    background-color: transparent;
    transition: var(--transition-smooth);
}

.product-image {
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    margin-bottom: 22px;
    background-color: #ECECE9;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(15%);
    transition: var(--transition-slow);
}

.product-card:hover .product-image img {
    transform: scale(1.06);
    filter: grayscale(0%);
}

.product-name {
    font-size: 1.6rem;
    font-weight: 400;
    margin-bottom: 10px;
    color: var(--color-dark);
    transition: var(--transition-fast);
}

.product-card:hover .product-name {
    color: var(--color-accent);
}

.product-desc {
    font-size: 0.88rem;
    line-height: 1.58;
}

/* 9. DEĞERLERİMİZ / VALUES SECTION (4 COLUMNS) */
.values-section {
    padding: 100px 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--color-gray-light);
    border-bottom: 1px solid var(--color-gray-light);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

.value-card {
    background-color: transparent;
    padding: 20px 0;
    transition: var(--transition-smooth);
}

.value-icon {
    font-size: 2.2rem;
    color: var(--color-accent);
    margin-bottom: 25px;
    font-weight: 300;
}

.value-title {
    font-size: 1.7rem;
    font-weight: 400;
    margin-bottom: 18px;
    color: var(--color-dark);
}

.value-text {
    font-size: 0.85rem;
    line-height: 1.6;
    text-align: justify;
}

/* 10. PARTNERS / MARQUEE SECTION */
.partners-section {
    padding: 100px 0 60px 0;
    background-color: var(--bg-primary);
    overflow: hidden;
}

.marquee-container {
    width: 100%;
    margin-top: 40px;
    overflow: hidden;
    position: relative;
    padding: 25px 0;
    border-top: 1px solid rgba(21, 21, 21, 0.05);
    border-bottom: 1px solid rgba(21, 21, 21, 0.05);
}

.marquee-container::before,
.marquee-container::after {
    content: '';
    position: absolute;
    top: 0;
    width: 150px;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.marquee-container::before {
    left: 0;
    background: linear-gradient(to right, var(--bg-primary) 0%, rgba(251, 251, 250, 0) 100%);
}

.marquee-container::after {
    right: 0;
    background: linear-gradient(to left, var(--bg-primary) 0%, rgba(251, 251, 250, 0) 100%);
}

.marquee-track {
    display: flex;
    width: max-content;
    animation: marquee 35s linear infinite;
}

.marquee-track:hover {
    animation-play-state: paused;
}

.partner-logo {
    width: 200px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.partner-logo img {
    max-height: 65px;
    max-width: 160px;
    width: auto;
    height: auto;
    object-fit: contain;
    filter: grayscale(100%) opacity(0.35);
    transition: var(--transition-fast);
}

.partner-logo:hover img {
    filter: grayscale(0%) opacity(0.9);
}

@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* 11. BLOG SECTION */
.blog-section {
    padding: 100px 0;
    border-top: 1px solid var(--color-gray-light);
    background-color: var(--bg-primary);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 50px;
}

.blog-post {
    display: flex;
    flex-direction: column;
}

.blog-post-img {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    margin-bottom: 25px;
    background-color: #ECECE9;
}

.blog-post-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(10%);
    transition: var(--transition-slow);
}

.blog-post:hover .blog-post-img img {
    transform: scale(1.04);
    filter: grayscale(0%);
}

.post-date {
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    margin-bottom: 8px;
}

.post-title {
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 12px;
    line-height: 1.3;
}

.blog-post:hover .post-title {
    color: var(--color-accent);
}

.post-excerpt {
    font-size: 0.88rem;
    line-height: 1.58;
}

/* 12. BIZE ULASIN / CONTACT & REQUEST FORM */
.contact-section {
    padding: 120px 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--color-gray-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 1.8fr;
    gap: 80px;
    align-items: flex-start;
}

.contact-info-col .section-title {
    text-align: left;
    margin-top: 10px;
}

.contact-intro {
    font-size: 1.05rem;
    margin-bottom: 45px;
}

.info-details {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.info-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.info-icon {
    font-size: 1.1rem;
    color: var(--color-accent);
    margin-top: 4px;
}

.info-content h4 {
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 6px;
    color: var(--color-dark);
}

.info-content p {
    font-size: 0.9rem;
    color: var(--color-gray-dark);
}

/* Form Styling */
.form-card {
    background-color: var(--bg-primary);
    padding: 50px;
    border: 1px solid rgba(21, 21, 21, 0.05);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.03);
}

.form-title {
    font-size: 1.8rem;
    font-weight: 300;
    margin-bottom: 35px;
    border-bottom: 1px solid var(--color-gray-light);
    padding-bottom: 15px;
}

.form-group {
    margin-bottom: 25px;
    display: flex;
    flex-direction: column;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group label {
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 300;
    padding: 12px 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--color-gray-light);
    color: var(--color-dark);
    outline: none;
    transition: var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(21, 21, 21, 0.25);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
}

/* Customize dropdown select */
.form-group select {
    cursor: pointer;
    border-radius: 0;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10" viewBox="0 0 10 10"><path fill="%23666" d="M0 3l5 5 5-5z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 5px center;
    padding-right: 20px;
}

.btn-submit {
    width: 100%;
    padding: 16px 0;
    background-color: var(--color-dark);
    color: #FFF;
    border: 1px solid var(--color-dark);
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    cursor: pointer;
    transition: var(--transition-fast);
    margin-top: 10px;
}

.btn-submit:hover {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

.form-feedback {
    margin-top: 15px;
    font-size: 0.82rem;
    font-weight: 400;
    text-align: center;
    min-height: 20px;
    transition: var(--transition-fast);
}

.form-feedback.success {
    color: #4C7D54;
}

.form-feedback.error {
    color: #A34848;
}

/* 13. FOOTER */
.main-footer {
    background-color: var(--color-dark);
    color: #FFF;
    padding: 90px 0 40px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.2fr 1.8fr;
    gap: 60px;
    margin-bottom: 70px;
}

.footer-logo {
    display: block;
    margin-bottom: 25px;
}

.footer-logo-img {
    height: 48px;
    width: auto;
    object-fit: contain;
    display: block;
}

.footer-tagline {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.45);
    margin-bottom: 30px;
    max-width: 250px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 36px;
    height: 36px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.88rem;
    transition: var(--transition-fast);
}

.social-links a:hover {
    color: var(--color-accent-light);
    border-color: var(--color-accent-light);
}

.footer-grid h4 {
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent-light);
    margin-bottom: 25px;
}

.footer-col-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col-links a {
    font-family: var(--font-body);
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.55);
}

.footer-col-links a:hover {
    color: #FFF;
    padding-left: 5px;
}

.footer-col-address p {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-body);
    font-size: 0.72rem;
    color: rgba(255, 255, 255, 0.3);
}

/* 14. RESPONSIVE DESIGN (MEDIA QUERIES) */

/* Large Tablets / Laptops */
@media (max-width: 1200px) {
    .section-title {
        font-size: 2.3rem;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
        row-gap: 50px;
    }
    
    .values-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

/* Tablets (Portrait) */
@media (max-width: 900px) {
    :root {
        --header-height: 80px;
    }
    
    .kurumsal-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .slide-title {
        font-size: 2.8rem;
    }
    
    .slide-desc {
        font-size: 0.95rem;
    }
    
    /* Show mobile menu toggle */
    .mobile-nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        background-color: var(--bg-primary);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.05);
        z-index: 999;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: right 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    }
    
    .nav-menu.open {
        right: 0;
    }
    
    .nav-menu ul {
        flex-direction: column;
        align-items: center;
        gap: 35px;
    }
    
    .nav-menu a {
        font-size: 0.95rem;
    }
    
    /* Hamburger Active Anims */
    .mobile-nav-toggle.active .bar:nth-child(1) {
        transform: translateY(6.5px) rotate(45deg);
    }
    
    .mobile-nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-6.5px) rotate(-45deg);
    }
}

/* Mobile Devices */
@media (max-width: 600px) {
    .section-title {
        font-size: 1.9rem;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .values-grid {
        grid-template-columns: 1fr;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .slide {
        padding: 0 5%;
    }
    
    .slide-title {
        font-size: 2.2rem;
    }
    
    .slider-controls {
        right: 5%;
        bottom: 30px;
    }
    
    .slider-indicators {
        left: 5%;
        bottom: 30px;
    }
    
    .form-card {
        padding: 30px 20px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
}

/* ==========================================================
   15. SUBPAGE GENERAL STYLES
   ========================================================== */
.subpage-header {
    padding: 160px 0 60px 0;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--color-gray-light);
    text-align: center;
}

.subpage-header h1 {
    font-size: 3.2rem;
    font-weight: 300;
    margin-bottom: 15px;
    color: var(--color-dark);
}

.breadcrumb {
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
}

.breadcrumb a {
    color: var(--color-gray-muted);
}

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

.breadcrumb-separator {
    margin: 0 8px;
    color: var(--color-gray-light);
}

/* ==========================================================
   16. PRODUCT DETAIL PAGE STYLES
   ========================================================== */
.product-detail-section {
    padding: 100px 0;
    background-color: var(--bg-primary);
}

.product-detail-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 80px;
    align-items: flex-start;
}

.product-detail-gallery {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.main-product-img {
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background-color: var(--bg-secondary);
    border: 1px solid rgba(21, 21, 21, 0.05);
}

.main-product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-thumbnail-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.thumb-img {
    aspect-ratio: 4 / 3;
    overflow: hidden;
    cursor: pointer;
    background-color: var(--bg-secondary);
    border: 1px solid rgba(21, 21, 21, 0.05);
}

.thumb-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(40%);
    transition: var(--transition-fast);
}

.thumb-img:hover img, .thumb-img.active img {
    filter: grayscale(0%);
    transform: scale(1.03);
}

.product-detail-info h2 {
    font-size: 2.8rem;
    font-weight: 300;
    margin-bottom: 20px;
    line-height: 1.15;
}

.product-detail-info .lead {
    font-size: 1.15rem;
    color: var(--color-gray-dark);
    margin-bottom: 30px;
    font-weight: 300;
}

.product-detail-info .description {
    margin-bottom: 40px;
}

.product-detail-info .description p {
    margin-bottom: 15px;
    text-align: justify;
}

/* Technical Specs Table */
.specs-title {
    font-size: 1.4rem;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--color-gray-light);
    padding-bottom: 8px;
    font-weight: 400;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 40px;
}

.specs-table tr {
    border-bottom: 1px solid rgba(21, 21, 21, 0.05);
}

.specs-table td {
    padding: 12px 0;
    font-size: 0.88rem;
    font-family: var(--font-body);
}

.specs-table td.spec-label {
    font-weight: 600;
    color: var(--color-dark);
    width: 40%;
}

.specs-table td.spec-value {
    color: var(--color-gray-muted);
}

.product-detail-info .btn-submit {
    display: inline-block;
    text-align: center;
}

/* ==========================================================
   17. UYGULAMALAR & GALLERY STYLES
   ========================================================== */
.gallery-section {
    padding: 80px 0 120px 0;
}

.gallery-filters {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 50px;
}

.filter-btn {
    background: none;
    border: 1px solid var(--color-gray-light);
    padding: 10px 24px;
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
    background-color: var(--color-dark);
    color: #FFF;
    border-color: var(--color-dark);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.gallery-item {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.gallery-item-img {
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background-color: var(--bg-secondary);
    margin-bottom: 15px;
}

.gallery-item-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(10%);
    transition: var(--transition-slow);
}

.gallery-item:hover .gallery-item-img img {
    transform: scale(1.05);
    filter: grayscale(0%);
}

.gallery-item-title {
    font-size: 1.35rem;
    font-weight: 400;
    color: var(--color-dark);
    margin-bottom: 4px;
}

.gallery-item-tag {
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ==========================================================
   18. REFERANSLAR STYLES
   ========================================================== */
.references-section {
    padding: 80px 0 120px 0;
}

.ref-intro {
    font-size: 1.15rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px auto;
    font-weight: 300;
}

.ref-table-container {
    width: 100%;
    overflow-x: auto;
}

.ref-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.ref-table th {
    padding: 16px 20px;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    border-bottom: 2px solid var(--color-dark);
}

.ref-table td {
    padding: 18px 20px;
    font-size: 0.9rem;
    font-family: var(--font-body);
    font-weight: 300;
    border-bottom: 1px solid var(--color-gray-light);
    color: var(--color-gray-dark);
}

.ref-table tr:hover td {
    background-color: var(--bg-secondary);
}

.ref-year {
    font-weight: 600;
    color: var(--color-dark);
}

/* ==========================================================
   19. RESPONSIVE SUBPAGES
   ========================================================== */
@media (max-width: 900px) {
    .subpage-header h1 {
        font-size: 2.4rem;
    }
    
    .product-detail-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .gallery-filters {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .filter-btn {
        padding: 8px 18px;
        font-size: 0.65rem;
    }
}

@media (max-width: 600px) {
    .subpage-header h1 {
        font-size: 2rem;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .ref-table th, .ref-table td {
        padding: 12px 10px;
        font-size: 0.8rem;
    }
}

/* ==========================================================
   20. CORPORATE BRANDING LOGO (KURUMSAL SAYFA LOGOSU)
   ========================================================== */
.kurumsal-logo-wrap {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--color-gray-light);
    max-width: 320px;
}

.kurumsal-logo-img {
    width: 100%;
    max-height: 120px;
    object-fit: contain;
    opacity: 0.85;
    transition: var(--transition-smooth);
}

.kurumsal-logo-wrap:hover .kurumsal-logo-img {
    opacity: 1;
    transform: translateY(-2px);
}

/* Who We Are Section Logo */
.who-we-are-logo {
    height: 90px;
    max-width: 360px;
    width: auto;
    object-fit: contain;
    display: block;
    margin: 0;
    padding: 0;
}

/* ==========================================================
   21. COLOR OPTIONS LIGHTBOX MODAL
   ========================================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(21, 21, 21, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.modal-content {
    background-color: var(--bg-primary);
    margin: 5% auto;
    padding: 40px;
    border: 1px solid rgba(21, 21, 21, 0.1);
    width: 85%;
    max-width: 800px;
    position: relative;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    border-radius: 4px;
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    color: var(--color-gray-muted);
    font-size: 2.2rem;
    font-weight: 300;
    cursor: pointer;
    transition: var(--transition-fast);
}

.close-modal:hover {
    color: var(--color-dark);
}

.modal-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 25px;
    text-align: center;
    font-weight: 300;
}

.color-slider-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background-color: var(--bg-secondary);
    border: 1px solid rgba(21, 21, 21, 0.05);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.color-slides {
    width: 100%;
    height: 100%;
}

.color-slide {
    display: none;
    width: 100%;
    height: 100%;
}

.color-slide img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.color-slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(251, 251, 250, 0.9);
    border: 1px solid var(--color-gray-light);
    color: var(--color-dark);
    width: 44px;
    height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition-fast);
    z-index: 10;
    border-radius: 50%;
}

.color-slider-btn:hover {
    background-color: var(--color-dark);
    color: #FFF;
    border-color: var(--color-dark);
}

.prev-btn { left: 15px; }
.next-btn { right: 15px; }

/* Responsive adjustments */
@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 20px;
    }
    .modal-title {
        font-size: 1.5rem;
    }
}