:root {
    --ana-renk: #6366f1;
    --ana-renk-hover: #4f46e5;
    --arka-plan: #0f172a;
    --kutu-arka-plan: rgba(30, 41, 59, 0.6);
    --siyah-transparan: rgba(15, 23, 42, 0.8);
    --metin: #f8fafc;
    --metin-soluk: #94a3b8;
    --sinir-rengi: rgba(255, 255, 255, 0.08);
}

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

body {
    background-color: var(--arka-plan);
    color: var(--metin);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Background gradient orb */
.arkaplan-efekti {
    position: fixed;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
}

/* Layout */
.kapsayici {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.icerik-alani {
    flex: 1;
    padding-top: 120px;
    padding-bottom: 60px;
}

/* Header */
.ust-sabit {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 80px;
    background: var(--siyah-transparan);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--sinir-rengi);
    z-index: 100;
}

.ust-sabit .kapsayici {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--metin);
    text-decoration: none;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff, #a5b4fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.ana-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.ana-menu a {
    color: var(--metin-soluk);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.ana-menu a:hover {
    color: var(--metin);
}

.dil-secici {
    display: flex;
    gap: 0.5rem;
    background: var(--kutu-arka-plan);
    padding: 0.3rem;
    border-radius: 20px;
    border: 1px solid var(--sinir-rengi);
}

.dil-secici a {
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.85rem;
    color: var(--metin-soluk);
}

.dil-secici a.aktif {
    background: var(--ana-renk);
    color: white;
}

/* Hero Section */
.kahraman-alani {
    text-align: center;
    padding: 6rem 0 4rem;
}

.kahraman-alani .baslik {
    font-size: 3.5rem;
    line-height: 1.2;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #ffffff, #a5b4fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Grid & Cards */
.uygulamalar-listesi {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.kart {
    background: var(--kutu-arka-plan);
    border: 1px solid var(--sinir-rengi);
    border-radius: 24px;
    padding: 2rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease;
    display: flex;
    flex-direction: column;
}

.kart:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    border-color: rgba(99, 102, 241, 0.4);
}

.kart h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--metin);
}

.kart p {
    color: var(--metin-soluk);
    margin-bottom: 2rem;
    flex: 1;
}

.buton {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background: rgba(99, 102, 241, 0.1);
    color: #a5b4fc;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    text-align: center;
    border: 1px solid rgba(99, 102, 241, 0.2);
    transition: all 0.3s ease;
}

.buton:hover {
    background: var(--ana-renk);
    color: white;
}

/* Footer */
footer {
    padding: 3rem 0;
    border-top: 1px solid var(--sinir-rengi);
    text-align: center;
    color: var(--metin-soluk);
    font-size: 0.9rem;
    background: var(--siyah-transparan);
}

/* 404 */
.hata-sayfasi { text-align: center; padding: 10vh 0; }
.hata-sayfasi h1 { font-size: 8rem; line-height: 1; color: var(--ana-renk); margin-bottom: 1rem; }
.hata-sayfasi h2 { font-size: 2rem; margin-bottom: 1rem; }
.hata-sayfasi p { color: var(--metin-soluk); margin-bottom: 2rem; }

/* Responsive */
@media (max-width: 768px) {
    .ust-sabit .kapsayici { flex-direction: column; justify-content: center; gap: 1rem; }
    .ust-sabit { height: auto; padding: 1rem 0; }
    .icerik-alani { padding-top: 150px; }
    .kahraman-alani .baslik { font-size: 2.2rem; }
    .ana-menu { gap: 1rem; flex-wrap: wrap; justify-content: center; }
}