:root {
    --bg-main: #ffffff;
    --bg-soft: #f8fafc;
    --bg-card: #ffffff;
    --accent: #0284c7;
    --accent-hover: #0369a1;
    --text-title: #0f172a;
    --text-body: #475569;
    --text-muted: #64748b;
    --border: #e2e8f0;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-main);
    color: var(--text-body);
    line-height: 1.6;
}

/* Navigasyon / Header */
header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    min-height: 90px;
    padding: 10px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-sizing: border-box;
}

.logo-container {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-container img {
    max-height: 120px;
    height: auto;
    width: auto;
    display: block;
    object-fit: contain;
    transition: max-height 0.3s ease;
}

/* Navigasyon Menüsü */
nav {
    display: flex;
    align-items: center;
    gap: 10px;
}

nav a {
    font-size: 1.10rem;
    font-weight: 600;
    color: #334155;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 8px;
    letter-spacing: 0.3px;
    transition: all 0.2s ease;
}

nav a:hover {
    color: var(--accent);
    background: rgba(2, 132, 199, 0.06);
}

nav a.active {
    color: var(--accent);
    background: rgba(2, 132, 199, 0.1);
}

/* Hamburger Menü Butonu */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--text-title);
    cursor: pointer;
    padding: 5px;
}

/* Hero Bölümü */
.hero {
    padding: 70px 5% 50px 5%;
    text-align: center;
    max-width: 850px;
    margin: 0 auto;
}

.hero-tag {
    display: inline-block;
    background-color: #eff6ff;
    color: var(--accent);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
    border: 1px solid #dbeafe;
}

.hero h1 {
    font-size: 2.6rem;
    color: var(--text-title);
    margin-bottom: 20px;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 35px;
}

/* Butonlar */
.cta-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 30px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--accent);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(2, 132, 199, 0.2);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(2, 132, 199, 0.3);
}

.btn-secondary {
    background-color: var(--bg-main);
    color: var(--text-title);
    border: 1px solid var(--border);
}

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

/* Kartlar & Sayfa Alanları */
.section-wrapper {
    background-color: var(--bg-soft);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 60px 5%;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    text-align: center;
    font-size: 1.8rem;
    color: var(--text-title);
    margin-bottom: 40px;
    font-weight: 700;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 15px;
    margin-bottom: 40px;
}

.card, .feature-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover, .feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.06);
    border-color: #cbd5e1;
}

.card-icon, .icon-box {
    width: 48px;
    height: 48px;
    background-color: #e0f2fe;
    color: var(--accent);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 18px;
}

.card h3 {
    font-size: 1.25rem;
    color: var(--text-title);
    margin-bottom: 12px;
    font-weight: 600;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Faaliyetler Sayfası Stilleri */
.page-title-section {
    padding: 30px 0 20px 0;
    text-align: center;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    margin-bottom: 40px;
}

.page-title-section h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    color: #0f172a;
}

.page-title-section p {
    color: #64748b;
    font-size: 1rem;
}

.section-badge {
    background: rgba(2, 132, 199, 0.1);
    color: var(--accent);
    padding: 6px 16px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.85rem;
    display: inline-block;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.accordion-item {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 18px 24px;
    margin-bottom: 12px;
    border: 1px solid var(--border);
}

.accordion-item h4 {
    color: var(--accent);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* İletişim Kutusu */
.contact-section {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #ffffff;
    border-radius: 20px;
    padding: 45px 25px;
    text-align: center;
    margin: 50px 0 20px 0;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.15);
}

.contact-section h2 {
    font-size: 2rem;
    margin-bottom: 12px;
    color: #ffffff;
}

.contact-section p {
    color: #94a3b8;
    max-width: 600px;
    margin: 0 auto;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.social-btn {
    background-color: #1e293b;
    color: #ffffff;
    border: 1px solid #334155;
    padding: 12px 24px;
    border-radius: 50px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
}

.social-btn:hover {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #ffffff;
    transform: translateY(-2px);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 5%;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Mobile Responsive Yapı */
@media (max-width: 880px) {
    header {
        padding: 10px 5%;
        min-height: 70px;
    }

    .logo-container img {
        max-height: 70px; /* Mobilde taşmayı önlemek için küçültüldü */
    }

    .mobile-toggle {
        display: block; /* Mobil menü butonu görünür */
    }

    nav {
        display: none; /* Mobilde varsayılan kapalı */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border);
        gap: 8px;
    }

    nav.active {
        display: flex; /* Hamburger tıklanınca açılır */
    }

    nav a {
        width: 100%;
        text-align: center;
        padding: 12px;
    }

    .hero h1 {
        font-size: 1.9rem;
    }

    .hero {
        padding: 40px 5% 30px 5%;
    }

    .grid-2, .grid-4, .grid {
        grid-template-columns: 1fr;
    }
}