/* ==========================================================================
   CSS Variables & Theming System
   ========================================================================== */
:root {
    /* Color Palette - Default Accessible (Soft & Calming) */
    --color-bg: #F8F9FA;
    /* Cream/Off-white */
    --color-text: #333333;
    /* Dark Charcoal */
    --color-primary: #00ACC1;
    /* Pastel Teal */
    --color-primary-light: #AEEAFA;
    /* Soft Ed Blue */
    --color-cta: #4CAF50;
    /* Soft Green */
    --color-cta-hover: #45a049;
    --color-card-bg: #FFFFFF;
    --color-border: #E0E0E0;
    --color-timeline: #CFD8DC;

    /* Typography Defaults */
    --font-family-base: 'Inter', sans-serif;
    --font-size-base: 16px;
    --font-size-h1: 2.5rem;
    --font-size-h2: 2rem;
    --font-size-h3: 1.5rem;
    --line-height-base: 1.6;
    --letter-spacing-base: normal;
    --letter-spacing-h: -0.02em;

    /* Spacing & Layout */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;

    /* Effects */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

/* --- High Contrast Theme Overrides --- */
:root[data-theme="high-contrast"] {
    --color-bg: #000000;
    --color-text: #FFFFFF;
    --color-primary: #FFFF00;
    /* Yellow on Black is very readable */
    --color-primary-light: #333300;
    --color-cta: #00FFFF;
    /* Cyan CTA */
    --color-cta-hover: #00CCCC;
    --color-card-bg: #121212;
    --color-border: #FFFFFF;
    --color-timeline: #555555;
}

/* --- Dyslexia Font Mode Overrides --- */
:root[data-font="dyslexia"] {
    --font-family-base: 'Lexend', 'Comic Sans MS', sans-serif;
    --font-size-base: 18px;
    /* Slightly larger */
    --line-height-base: 1.8;
    /* More breathing room */
    --letter-spacing-base: 0.05em;
    /* Increase character tracking */
    --letter-spacing-h: 0.02em;
}

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

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    letter-spacing: var(--letter-spacing-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: var(--transition);
    overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
    font-weight: 700;
    letter-spacing: var(--letter-spacing-h);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    /* Ensure contrast mode applies */
}

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

a:hover,
a:focus {
    text-decoration: underline;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-title {
    text-align: center;
    font-size: var(--font-size-h2);
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--color-primary);
    border-radius: 2px;
}

.section-bg {
    background-color: var(--color-card-bg);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

section {
    padding: var(--spacing-xl) 0;
}

/* ==========================================================================
   Components
   ========================================================================== */

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    font-weight: 600;
    border-radius: 50px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 1.1rem;
    text-decoration: none;
}

.btn:hover,
.btn:focus {
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-cta);
    color: #FFFFFF;
    /* High contrast inner text */
}

[data-theme="high-contrast"] .btn-primary {
    color: #000000;
    font-weight: 700;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--color-cta-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Header */
.site-header {
    background-color: var(--color-bg);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: nowrap;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-right: auto;
    /* Push the menu and buttons to the right edge */
    flex-shrink: 0;

}

.tubitak-placeholder {
    background-color: var(--color-primary-light);
    color: var(--color-text);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-md);
    font-weight: 700;
    font-size: 0.9rem;
    border: 1px solid var(--color-primary);
}

.site-branding {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);

}

.site-logo {
    height: 80px;
    width: auto;
    display: block;
    border-radius: 8px;
    /* Optional, just in case */
    box-shadow: var(--shadow-sm);
    /* A little depth */
    transition: var(--transition);
}

.site-logo:hover {
    transform: scale(1.02);
}

.site-title-text {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
    line-height: 1;
}

[data-theme="high-contrast"] .site-title-text {
    color: var(--color-primary);
}

.project-title h1 {
    font-size: 1.2rem;
    margin: 0;
    color: var(--color-primary);
}

[data-theme="high-contrast"] .project-title h1 {
    color: var(--color-primary);
}

.accessibility-controls {
    display: flex;
    gap: 0.5rem;
    /* Butonları birbirine biraz daha yaklaştırdık */
    flex-shrink: 0;
    white-space: nowrap;
}

.btn-icon {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-text);
    padding: 0.5rem 1rem;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    font-size: 0.9rem;
    outline: none;
}

.btn-icon:hover,
.btn-icon:focus {
    background-color: var(--color-primary-light);
}

.btn-icon[aria-pressed="true"] {
    background-color: var(--color-primary);
    color: var(--color-bg);
}

/* Hero Section */
.hero {
    padding: calc(var(--spacing-xl) * 1.5) 0 var(--spacing-xl);
    overflow: hidden;
    position: relative;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-primary-light) 100%);
}

[data-theme="high-contrast"] .hero {
    background: var(--color-bg);
    border-bottom: 2px solid var(--color-primary);
}

.hero-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.hero-content {
    flex: 1;
    z-index: 2;
}

.hero-title {
    font-size: var(--font-size-h1);
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

[data-theme="high-contrast"] .hero-title {
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    max-width: 500px;
    color: var(--color-text);
    opacity: 0.9;
}

.hero-image-wrapper {
    flex: 1;
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: center;
}

.hero-img {
    max-width: 100%;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    animation: float 6s ease-in-out infinite;
    border: 4px solid var(--color-bg);
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-15px);
    }

    100% {
        transform: translateY(0px);
    }
}

/* Project Basics Cards */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    background-color: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.card-icon {
    width: 80px;
    height: 80px;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

[data-theme="high-contrast"] .card-icon {
    background-color: var(--color-bg);
    border: 2px solid var(--color-primary);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.95rem;
    opacity: 0.85;
}

/* Timeline / How it works */
.timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.timeline-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    background-color: var(--color-card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.timeline-marker {
    width: 50px;
    height: 50px;
    background-color: var(--color-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.5rem;
    flex-shrink: 0;
}

[data-theme="high-contrast"] .timeline-marker {
    color: #000;
}

.timeline-content h3 {
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

[data-theme="high-contrast"] .timeline-content h3 {
    color: var(--color-text);
}

/* Specific styling for larger screens */
@media (min-width: 768px) {
    .timeline {
        flex-direction: row;
        align-items: stretch;
    }

    .timeline-item {
        flex: 1;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .timeline-line {
        display: block;
        flex-grow: 1;
        height: 4px;
        background-color: var(--color-timeline);
        margin-top: 25px;
        /* align with marker */
    }

    .timeline-marker {
        margin-bottom: var(--spacing-sm);
    }
}

@media (max-width: 767px) {
    .timeline-line {
        display: none;
    }
}

/* Targeted Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.skill-column {
    background-color: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
}

.skill-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-primary-light);
    padding-bottom: var(--spacing-xs);
}

.skill-icon {
    font-size: 2rem;
}

.skill-list {
    list-style: none;
}

.skill-list li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: var(--spacing-sm);
    font-size: 1.05rem;
}

.skill-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-cta);
    font-weight: bold;
    font-size: 1.2rem;
}

/* Academic Team */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    justify-items: center;
}

.team-card {
    text-align: center;
    width: 100%;
    max-width: 250px;
}

.member-avatar {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background-color: var(--color-primary-light);
    margin: 0 auto var(--spacing-sm);
    border: 4px solid var(--color-card-bg);
    box-shadow: var(--shadow-sm);
	overflow: hidden;
    /* In a real scenario, use background-image */
}
.member-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
}

[data-theme="high-contrast"] .member-avatar {
    background-color: var(--color-bg);
    border: 2px solid var(--color-primary);
}

.member-name {
    font-size: 1.2rem;
    margin-bottom: 0.2rem;
}

.member-title {
    color: var(--color-primary);
    font-weight: 500;
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
}

[data-theme="high-contrast"] .member-title {
    color: var(--color-text);
}

.uni-logo-placeholder {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    font-size: 0.8rem;
    border: 1px dashed var(--color-border);
    border-radius: 4px;
    color: #777;
}

/* Footer */
.site-footer {
    background-color: var(--color-text);
    color: #FFFFFF;
    padding: var(--spacing-lg) 0 var(--spacing-sm);
}

[data-theme="high-contrast"] .site-footer {
    border-top: 2px solid var(--color-primary);
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    display: inline-block;
    margin-bottom: var(--spacing-sm);
    color: #333;
    /* Because background of tubitak-placeholder is light */
}

.tubitak-img {
    height: 80px;
    width: auto;
    background-color: #FFFFFF;
    /* Geri plan koyu olduğu için görünür olmasını sağlar */
    padding: 0.5rem;
    border-radius: 8px;
}

.footer-col h4 {
    color: #FFFFFF;
    margin-bottom: var(--spacing-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding-bottom: 0.5rem;
}

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

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #CCCCCC;
}

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

.footer-text {
    color: #CCCCCC;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-sm);
    font-size: 0.85rem;
    color: #999;
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.main-nav {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    white-space: nowrap;
    /* Menünün tek satır kalmasını garantiler */
    flex-shrink: 0;
}

.main-nav a {
    color: var(--color-text);
    font-weight: 500;
    font-size: 1.05rem;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-md);
    transition: var(--transition);
}

.main-nav a:hover,
.main-nav a:focus,
.main-nav a.active {
    background-color: var(--color-primary-light);
    color: var(--color-text);
    text-decoration: none;
}

[data-theme="high-contrast"] .main-nav a.active {
    background-color: var(--color-primary);
    color: var(--color-bg);
}

/* ==========================================================================
   Inner Page Layouts
   ========================================================================== */
.page-header {
    background-color: var(--color-bg);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.page-title {
    font-size: var(--font-size-h1);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

[data-theme="high-contrast"] .page-title {
    color: var(--color-text);
}

.page-subtitle {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.9;
}

.content-section {
    padding: var(--spacing-lg) 0;
}

.article-box {
    background-color: var(--color-card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    max-width: 900px;
    margin: 0 auto var(--spacing-md);
}

.article-box p {
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

/* Extended Team Card */
.team-grid-large {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.team-card-detailed {
    background-color: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.team-bio {
    margin-top: var(--spacing-sm);
    font-size: 0.95rem;
    text-align: left;
    border-top: 1px dashed var(--color-border);
    padding-top: var(--spacing-sm);
    color: var(--color-text);
    opacity: 0.9;
}

/* Contact Form */
.contact-container {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--color-card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    font-family: inherit;
    font-size: 1rem;
    background-color: var(--color-bg);
    color: var(--color-text);
}

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

textarea.form-input {
    resize: vertical;
    min-height: 120px;
}

/* Publications */
.pub-item {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.pub-item:last-child {
    border-bottom: none;
}

.pub-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

[data-theme="high-contrast"] .pub-title {
    color: var(--color-primary);
}

.pub-authors {
    font-style: italic;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }

    .hero-subtitle {
        margin: 0 auto var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .logo-area {
        margin-right: 0;
    }

    .main-nav {
        white-space: normal;
        flex-wrap: wrap;
        justify-content: center;
    }

    .accessibility-controls {
        width: 100%;
        justify-content: center;
    }

    :root:not([data-font="dyslexia"]) {
        --font-size-h1: 2rem;
        --font-size-h2: 1.75rem;
    }
}