:root {
    /* Colors */
    --primary: #0891b2; /* Turquoise / Cyan mix */
    --primary-light: #22d3ee;
    --primary-dark: #0e7490;
    --secondary: #0f172a; /* Dark Navy */
    --secondary-light: #1e293b;
    --background: #ffffff;
    --surface: #f8fafc;
    --text-main: #334155;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --white: #ffffff;
    
    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Layout */
    --container-width: 1200px;
    --container-padding: 1.5rem;
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --border-radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.01);
    --shadow-hover: 0 20px 40px -10px rgba(8, 145, 178, 0.1);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    overflow-y: scroll;
}

body {
    font-family: var(--font-family);
    color: var(--text-main);
    background-color: var(--background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}


/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--secondary);
    line-height: 1.2;
    font-weight: 700;
}

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: 1.25rem;
}

p {
    font-size: 1.125rem;
    color: var(--text-muted);
}

/* Layout */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--spacing-xl) 0;
    scroll-margin-top: 130px;
}

.bg-light {
    background-color: var(--surface);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-full);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
    white-space: nowrap;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 14px 0 rgba(8, 145, 178, 0.39);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(8, 145, 178, 0.4);
}

.btn-secondary {
    background-color: var(--surface);
    color: var(--secondary);
    border: 1px solid var(--border);
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
    padding: 1rem 0;
}

.header.scrolled {
    padding: 0.75rem 0;
    background-color: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

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

.logo-text {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--secondary);
    line-height: 1.1;
}

.logo-text span {
    color: var(--primary);
}

.logo small {
    font-weight: 400;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.nav {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

.nav-list {
    display: flex;
    gap: 0.5rem;
}

.nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-main);
    position: relative;
    padding: 0.5rem 0.5rem;
    white-space: nowrap;
}

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

.nav-link:hover {
    color: var(--primary);
}

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

.nav-link.active {
    color: var(--white);
    background-color: var(--primary);
    border-radius: 20px;
    padding: 0.4rem 0.75rem;
}
.nav-link.active::after {
    display: none;
}

.header-cta {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--secondary);
    transition: var(--transition);
    border-radius: 2px;
}

/* Hero Section */
.hero {
    padding-top: 10rem; /* Account for sticky header which is now taller */
    padding-bottom: var(--spacing-xl);
    overflow: hidden;
    position: relative;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    max-width: 600px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-title {
    margin-bottom: 1.5rem;
}

.hero-title span {
    color: var(--primary);
}

.hero-description {
    margin-bottom: 2.5rem;
    font-size: 1.25rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

.hero-image-wrapper {
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transform: perspective(1000px) rotateY(-5deg);
    transition: var(--transition);
}

.hero-image-wrapper:hover {
    transform: perspective(1000px) rotateY(0deg) translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: var(--border-radius-lg);
}

.hero-image-wrapper::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(8, 145, 178, 0.1) 0%, rgba(255,255,255,0) 100%);
    pointer-events: none;
}

/* Features Section */
.features {
    padding-bottom: 2rem;
    margin-top: -4rem; /* Overlap hero slightly */
    position: relative;
    z-index: 10;
}

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

.feature-card {
    background-color: var(--white);
    padding: 0;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid rgba(226, 232, 240, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(8, 145, 178, 0.2);
}

.feature-image-banner {
    width: 100%;
    height: 180px;
    background-color: var(--surface);
    overflow: hidden;
}

.feature-image-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    transition: transform 0.5s ease;
}

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

.feature-content {
    padding: 2rem 1.5rem;
}

.feature-title {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--secondary);
}

.feature-description {
    font-size: 1rem;
    line-height: 1.5;
}

/* Treatments Section */
.treatments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.treatment-card {
    background-color: var(--surface);
    border-radius: var(--border-radius-md);
    text-align: center;
    border: 1px solid rgba(226, 232, 240, 0.5);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 250px;
}

.treatment-image-wrapper {
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background-color: var(--background);
}

.treatment-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.treatment-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.treatment-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: rgba(8, 145, 178, 0.3);
}

.treatment-title {
    font-size: 1.1rem;
    margin: 0;
    font-weight: 600;
    transition: color 0.3s ease;
}

.treatment-card:hover .treatment-title {
    color: var(--primary);
}

/* Doctors Section */
.doctors-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.doctor-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid rgba(226, 232, 240, 0.5);
    display: flex;
    flex-direction: column;
}

.doctor-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(8, 145, 178, 0.2);
}

.doctor-image-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    background-color: var(--surface);
}

.doctor-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.5s ease;
}

.doctor-card:hover .doctor-image {
    transform: scale(1.05);
}

.doctor-info {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.doctor-name {
    font-size: 1.5rem;
    color: var(--secondary);
    margin-bottom: 0.25rem;
    min-height: 3.6rem; /* İki satırlık isimlerde unvanın hizasını korumak için */
    position: relative;
    padding-bottom: 0.5rem;
}

.doctor-name::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 3px;
    background-color: var(--primary-dark);
    border-radius: 2px;
}

.doctor-title {
    color: var(--primary);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 1rem;
    min-height: 2.8rem; /* Unvanların kapladığı alanı sabitleyerek biyografilerin aynı hizada başlamasını sağlar */
}

.doctor-bio {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    flex: 1;
    text-align: justify;
    -webkit-hyphens: auto;
    -ms-hyphens: auto;
    hyphens: auto;
}

/* Placeholder Sections */
.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.placeholder-content {
    background-color: var(--white);
    padding: 4rem 2rem;
    border-radius: var(--border-radius-lg);
    border: 2px dashed var(--border);
    text-align: center;
    color: var(--text-muted);
}

/* Clinic Gallery Marquee */
.gallery-marquee-container {
    width: 100%;
    overflow: hidden;
    position: relative;
    padding-bottom: 2rem;
}

.gallery-marquee-track {
    display: flex;
    width: max-content;
    gap: 2rem;
    animation: scroll-gallery 80s linear infinite;
}

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

.gallery-marquee-img {
    width: 400px;
    height: 300px;
    object-fit: cover;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    /* Kayarken oluşan bulanıklığı ve titreşimi önlemek için GPU hızlandırma ayarları */
    will-change: transform;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    transform: translateZ(0);
    image-rendering: -webkit-optimize-contrast;
}

.gallery-marquee-img:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-md);
}

@keyframes scroll-gallery {
    0% { transform: translateX(0); }
    100% { transform: translateX(calc(-50% - 1rem)); }
}

/* Footer Placeholder */
.footer {
    background-color: var(--secondary);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer .placeholder-content {
    background-color: transparent;
    border-color: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.7);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        gap: 2rem;
    }
    
    .features-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .doctors-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .nav-list {
        gap: 1.5rem;
    }
}

@media (max-width: 1350px) {
    .header-cta .btn {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background-color: var(--white);
        flex-direction: column;
        justify-content: flex-start;
        padding: 6rem 2rem 2rem;
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .nav.active {
        right: 0;
    }
    
    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
    
    .nav-link {
        font-size: 1.25rem;
        display: block;
        width: 100%;
    }
    
    /* Hamburger Animation */
    .mobile-menu-btn.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    .mobile-menu-btn.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .hero {
        padding-top: 8rem;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        margin: 0 auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-image-wrapper {
        transform: none;
        margin-top: 2rem;
    }
    
    .features {
        margin-top: 0;
        padding-top: var(--spacing-lg);
    }
    
    .doctors-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .features-container {
        grid-template-columns: 1fr;
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-actions .btn {
        width: 100%;
    }
    
    h1 {
        font-size: 2.25rem;
    }
}