/* ==========================================================================
   ONCOGENCELL - TEMEL AYARLAR VE DEĞİŞKENLER
   ========================================================================== */
:root {
    --primary: #5BC4A5;
    --primary-hover: #48a68b;
    --dark: #2B324D;
    --light-gray: #f8f9fa;
    --text-gray: #6c757d;
    --white: #ffffff;
    --font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--dark);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}

.section-header p {
    max-width: 800px;
    margin: 0 auto;
    color: var(--text-gray);
    font-size: 16px;
}

.section-header.line-after h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary);
    margin: 20px auto 0;
    border-radius: 2px;
}

/* --- ANİMASYON SINIFLARI --- */
.fade-up {
    opacity: 0;
    transform: translateY(25px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
    will-change: opacity, transform;
}

.fade-up.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-up.anim-done {
    transform: none !important;
    will-change: auto;
}

.no-js .fade-up {
    opacity: 1;
    transform: none;
}

@media (prefers-reduced-motion: reduce) {
    .fade-up {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

.delay-1 { transition-delay: 0.05s; }
.delay-2 { transition-delay: 0.1s; }
.delay-3 { transition-delay: 0.15s; }
.delay-4 { transition-delay: 0.2s; }
.delay-5 { transition-delay: 0.25s; }

/* ==========================================================================
   HEADER & NAVBAR
   ========================================================================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 25px 0;
    z-index: 100;
    color: var(--white);
    background: transparent;
    transition: padding 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
    transform: translateZ(0);
}

header.scrolled {
    padding: 14px 0;
    background: rgba(30, 36, 56, 0.98);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 28px;
    font-weight: 300;
    letter-spacing: 1px;
    color: inherit;
    text-decoration: none;
    cursor: pointer;
}

.site-logo {
    height: 42px;
    width: auto;
    object-fit: contain;
    transition: transform 0.3s ease, filter 0.3s ease;
}

.logo:hover .site-logo {
    transform: scale(1.03);
}

header.scrolled .site-logo {
    height: 36px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 35px;
    font-size: 15px;
    font-weight: 500;
}

.nav-links li a {
    position: relative;
    padding-bottom: 5px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.nav-links li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--white);
    transition: width 0.3s ease;
}

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

.nav-links li {
    position: relative;
    display: flex;
    align-items: center;
}

.dropdown-icon {
    font-size: 10px;
    transition: transform 0.3s ease;
}

.dropdown:hover .dropdown-icon {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--dark);
    list-style: none;
    border-radius: 8px;
    padding: 10px 0;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.25s ease;
    z-index: 200;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    width: 100%;
}

.dropdown-menu li a {
    padding: 10px 20px;
    width: 100%;
    font-size: 14px;
    color: var(--white);
    display: block;
}

.dropdown-menu li a::after {
    display: none;
}

.dropdown-menu li a:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--primary);
}

.nav-icons {
    display: flex;
    align-items: center;
    gap: 10px;
}

.lang-dropdown {
    position: relative;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: inherit;
    font-size: 14px;
    cursor: pointer;
    padding: 6px 14px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--primary);
}

.lang-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 140px;
    background: var(--dark);
    list-style: none;
    border-radius: 8px;
    padding: 8px 0;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.25s ease;
    z-index: 200;
}

.lang-dropdown:hover .lang-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-menu li a {
    padding: 8px 16px;
    display: block;
    font-size: 13px;
    color: var(--white);
    transition: background 0.2s ease, color 0.2s ease;
}

.lang-menu li a::after {
    display: none;
}

.lang-menu li a.active {
    color: var(--primary);
    font-weight: 600;
}

.lang-menu li a:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--primary);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: inherit;
    font-size: 22px;
    cursor: pointer;
    padding: 4px 8px;
}

/* ==========================================================================
   HERO BÖLÜMÜ
   ========================================================================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    background: url('https://images.unsplash.com/photo-1579154204601-01588f351e67?auto=format&fit=crop&q=80') center/cover no-repeat;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(43, 50, 77, 0.85) 0%, rgba(43, 50, 77, 0.6) 100%);
    z-index: 1;
}

.hero-content {
    max-width: 900px;
    padding: 0 20px;
    z-index: 2;
    position: relative;
}

.hero h1 {
    font-size: 60px;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 25px;
    text-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 18px;
    margin-bottom: 45px;
    font-weight: 300;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
    opacity: 0.9;
}

.hero-btns {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 16px 36px;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
    letter-spacing: 0.5px;
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(91, 196, 165, 0.4);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(91, 196, 165, 0.5);
}

.btn-white {
    background-color: var(--white);
    color: var(--dark);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-white:hover {
    background-color: #f8f9fa;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* ==========================================================================
   ÖZELLİKLER, YÖNTEMLER VE İÇERİK BLOKLARI
   ========================================================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    border-radius: 12px;
    overflow: hidden;
    padding-bottom: 20px;
    background: var(--white);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.08);
}

.feature-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    margin-bottom: 20px;
    transition: transform 0.4s ease;
}

.feature-card:hover img {
    transform: scale(1.05);
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--dark);
    padding: 0 15px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-gray);
    padding: 0 15px;
    flex-grow: 1;
}

.methods-section {
    background-color: var(--light-gray);
    position: relative;
}

.methods-section::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,0,0,0.05), transparent);
}

.methods-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    counter-reset: method;
}

.method-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
    padding: 25px 15px;
    border-radius: 12px;
    height: 100%;
}

.method-item:hover {
    background: var(--white);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transform: translateY(-5px);
}

.method-icon {
    width: 90px;
    height: 90px;
    background-color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 36px;
    margin-bottom: 25px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.06);
    transition: transform 0.3s ease, background-color 0.3s ease, color 0.3s ease;
}

.method-item:hover .method-icon {
    transform: scale(1.1) rotate(5deg);
    background-color: var(--primary);
    color: var(--white);
}

.method-item h4 {
    font-size: 14px;
    text-transform: uppercase;
    margin-bottom: 15px;
    color: var(--dark);
    letter-spacing: 0.5px;
    min-height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.method-item p {
    font-size: 14px;
    color: var(--text-gray);
    text-align: center;
}

.how-it-works-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.how-text h2 {
    font-size: 42px;
    margin-bottom: 20px;
    color: var(--dark);
    line-height: 1.2;
}

.how-text h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary);
    margin-top: 25px;
    border-radius: 2px;
}

.how-text p {
    color: var(--text-gray);
    margin-bottom: 40px;
    font-size: 16px;
    font-weight: 300;
}

.how-img {
    position: relative;
}

.how-img::before {
    content: '';
    position: absolute;
    top: -20px; right: -20px; bottom: 20px; left: 20px;
    background-color: #c5dfd3;
    border-radius: 12px;
    z-index: -1;
    transition: transform 0.3s ease;
}

.how-img:hover::before {
    transform: translate(10px, -10px);
}

.how-img img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

/* ==========================================================================
   VİDEO BÖLÜMÜ
   ========================================================================== */
.video-section {
    padding: 40px 0 120px;
}

.video-container {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
    border-radius: 15px;
    overflow: hidden;
    background: #111827;
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: 15px;
}

.video-fallback {
    padding: 20px;
    text-align: center;
    color: #9ca3af;
    font-size: 14px;
}

/* ==========================================================================
   YORUMLAR & HABERLER
   ========================================================================== */
.testimonials-section {
    background-color: var(--light-gray);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.testimonial-card {
    background-color: var(--white);
    padding: 40px 30px;
    text-align: center;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.08);
}

.quote-mark {
    color: var(--primary);
    font-size: 50px;
    font-family: Georgia, serif;
    line-height: 1;
    margin-bottom: 20px;
    opacity: 0.5;
}

.testimonial-card p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 30px;
    font-style: italic;
}

.author-info h5 {
    font-size: 16px;
    color: var(--dark);
    margin-bottom: 15px;
    font-weight: 600;
}

.author-info img {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto;
    border: 3px solid var(--light-gray);
}

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

.news-card {
    border-radius: 15px;
    overflow: hidden;
    background: var(--white);
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.news-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.08);
}

.news-img-wrap {
    overflow: hidden;
}

.news-card img {
    width: 100%;
    height: 240px;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.news-card:hover img {
    transform: scale(1.06);
}

.news-content {
    padding: 25px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.news-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--dark);
    line-height: 1.4;
}

.news-card p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 25px;
    flex-grow: 1;
}

.read-more {
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
}

.read-more i {
    margin-left: 8px;
    transition: transform 0.25s ease;
}

.news-card:hover .read-more i {
    transform: translateX(5px);
}

/* ==========================================================================
   İLETİŞİM FORMU & FOOTER
   ========================================================================== */
.contact-section {
    background-color: var(--light-gray);
    padding-bottom: 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 80px;
}

.contact-img {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.contact-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 500px;
    transition: transform 0.4s ease;
}

.contact-img:hover img {
    transform: scale(1.03);
}

.contact-info-wrap {
    padding: 30px 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-info-wrap h2 {
    font-size: 32px;
    margin-bottom: 20px;
    color: var(--dark);
    line-height: 1.2;
}

.contact-info-wrap > p {
    font-size: 15px;
    color: var(--text-gray);
    margin-bottom: 40px;
}

.contact-detail {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
    transition: transform 0.25s ease;
}

.contact-detail:hover {
    transform: translateX(8px);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background-color: var(--dark);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
    box-shadow: 0 5px 15px rgba(43, 50, 77, 0.2);
}

.contact-detail p, .contact-detail a {
    font-size: 15px;
    color: var(--dark);
    font-weight: 500;
}

.contact-form {
    background-color: var(--white);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.05);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-size: 14px;
    color: var(--dark);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    font-family: inherit;
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
    background-color: #f8fafc;
}

.form-group input:focus {
    border-color: var(--primary);
    background-color: var(--white);
    box-shadow: 0 0 0 3px rgba(91, 196, 165, 0.1);
}

.form-group input:invalid:not(:placeholder-shown) {
    border-color: #e0554f;
}

.form-error {
    display: none;
    color: #c0392b;
    font-size: 13px;
    margin-top: 15px;
    padding: 10px 14px;
    background: #fdecea;
    border-radius: 6px;
}

.form-error.visible {
    display: block;
}

.form-success {
    display: none;
    color: #1b5e20;
    font-size: 14px;
    margin-top: 15px;
    padding: 14px;
    background: #e8f5e9;
    border-radius: 6px;
    text-align: center;
}

.form-success.visible {
    display: block;
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 30px;
}

.checkbox-group input {
    margin-top: 5px;
    cursor: pointer;
}

.checkbox-group label {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.5;
    cursor: pointer;
}

.btn-submit {
    width: 100%;
    padding: 16px;
    background-color: #122b40;
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    font-size: 15px;
    transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.btn-submit:hover {
    background-color: var(--primary);
    box-shadow: 0 8px 20px rgba(91, 196, 165, 0.3);
    transform: translateY(-2px);
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.form-footer-links {
    text-align: center;
    margin-top: 25px;
    font-size: 12px;
}

.form-footer-links a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.form-footer-links a:hover {
    text-decoration: underline;
}

footer {
    text-align: center;
    padding: 30px 0;
    background-color: var(--white);
    border-top: 1px solid #eaeaea;
}

.footer-note {
    font-size: 12px;
    color: var(--text-gray);
    margin-top: 15px;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 25px;
}

.social-icons a {
    color: var(--text-gray);
    font-size: 24px;
    transition: color 0.25s ease, transform 0.25s ease;
}

.social-icons a:hover {
    color: var(--primary);
    transform: translateY(-3px);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    background: var(--dark);
    color: var(--white);
    padding: 12px 20px;
    z-index: 1000;
    border-radius: 0 0 8px 0;
}

.skip-link:focus {
    left: 0;
}

/* ==========================================================================
   RESPONSIVE (DUYARLI) TASARIM
   ========================================================================== */
@media (max-width: 1024px) {
    .features-grid,
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .contact-img {
        display: none;
    }
    .hero h1 {
        font-size: 48px;
    }
    .how-it-works-grid {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .site-logo {
        height: 32px;
    }
    header.scrolled .site-logo {
        height: 28px;
    }
    .hero h1 {
        font-size: 38px;
    }
    .hero p {
        font-size: 16px;
    }
    .nav-links {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }
    .features-grid,
    .testimonials-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
    .how-it-works-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .section {
        padding: 60px 0;
    }
    .contact-form {
        padding: 25px;
    }
}