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

body {
    font-family: 'Inter', 'Segoe UI', sans-serif;
    background-color: #ffffff;
    color: #000000;
    line-height: 1.8;
    overflow-x: hidden;
}

div:first-child {
    background: rgba(255, 255, 255, 0.95);
    padding: 25px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    border-bottom: 2px solid #e5e5e5;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

div:first-child a {
    color: #666666;
    font-weight: 600;
    padding: 12px 32px;
    margin: 0 5px;
    font-size: 15px;
    display: inline-block;
    position: relative;
    transition: color 0.3s;
}

div:first-child a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: #000000;
    transition: width 0.3s;
}

div:first-child a:hover {
    color: #000000;
}

div:first-child a:hover::before {
    width: 80%;
}

#hakkimda {
    background: #f5f5f5;
    padding: 140px 60px;
    position: relative;
}

#hakkimda::after {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 0, 0, 0.03), transparent);
    top: -200px;
    right: -200px;
    border-radius: 50%;
    z-index: 0;
}

.hakkimda-icerik {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1300px;
    margin: 0 auto;
    gap: 100px;
    position: relative;
    z-index: 1;
}

.hakkimda-yazi {
    flex: 1;
}

.hakkimda-yazi h2 {
    font-size: 56px;
    margin-bottom: 30px;
    font-weight: 800;
    line-height: 1.2;
    color: #000000;
}

.hakkimda-yazi span {
    background: linear-gradient(135deg, #333333 0%, #000000 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hakkimda-yazi p {
    font-size: 22px;
    color: #555555;
    margin-top: 20px;
    font-weight: 300;
}

.hakkimda-foto img {
    border-radius: 30px;
    border: 3px solid #000000;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    transition: all 0.5s ease;
    position: relative;
}

.hakkimda-foto img:hover {
    transform: translateY(-15px);
    box-shadow: 0 35px 70px rgba(0, 0, 0, 0.25);
}

#teknolojiler {
    background: #ffffff;
    padding: 120px 60px;
}

#teknolojiler h2 {
    font-size: 44px;
    margin-bottom: 60px;
    text-align: center;
    font-weight: 700;
    color: #000000;
}

#teknolojiler img {
    margin: 12px 10px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

#teknolojiler img:hover {
    transform: translateY(-12px) scale(1.1);
    filter: drop-shadow(0 10px 25px rgba(0, 0, 0, 0.2));
}

#projeler {
    background: #f5f5f5;
    padding: 120px 60px;
    position: relative;
}

#projeler::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 0, 0, 0.02), transparent);
    bottom: -150px;
    left: -150px;
    border-radius: 50%;
}

#projeler h2 {
    font-size: 44px;
    margin-bottom: 60px;
    text-align: center;
    font-weight: 700;
    color: #000000;
    position: relative;
    z-index: 1;
}

#repo-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 35px;
    margin-top: 60px;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    z-index: 1;
}

#sertifikalar {
  text-align: center;
  padding: 40px;
  background-color: #f9f9f9;
}

#sertifikalar h2 {
  font-size: 28px;
  margin-bottom: 20px;
  color: #000;
}

#sertifikalar img {
  display: inline-block;
  margin: 10px;
  border: 2px solid #000;
  border-radius: 10px;
  transition: transform 0.3s;
}

#sertifikalar img:hover {
  transform: scale(1.05);
}


footer {
    background: #000000;
    padding: 100px 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, #333333, transparent);
    top: 0;
    left: 0;
}

footer h2 {
    font-size: 44px;
    margin-bottom: 50px;
    font-weight: 700;
    color: #ffffff;
}

footer a {
    color: #666666;
    font-size: 60px;
    margin: 0 30px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-block;
}

footer a:hover {
    color: #ffffff;
    transform: translateY(-15px) scale(1.2);
    filter: drop-shadow(0 15px 30px rgba(255, 255, 255, 0.3));
}

h2 {
    color: #000000;
}

p {
    color: #555555;
}

a {
    text-decoration: none;
}

article {
    height: 0;
}


#renkmodu {
    background: transparent;
    border: 2px solid #ffffff;
    color: #ffffff;
    font-size: 24px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s;
}

body.light-mode #renkmodu {
    border-color: #000000;
    color: #000000;
}

#renkmodu:hover {
    transform: rotate(20deg) scale(1.1);
}


#parlaklik-uyari {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
}

#uyari-kutu {
    background: #ffffff;
    padding: 40px;
    border-radius: 15px;
    max-width: 500px;
    text-align: center;
    box-shadow: 0 10px 50px rgba(0, 0, 0, 0.5);
}

#uyari-kutu h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: #000000;
}

#uyari-kutu p {
    font-size: 18px;
    color: #555555;
    margin-bottom: 25px;
}

#uyari-kapat {
    background: #000000;
    color: #ffffff;
    border: none;
    padding: 15px 40px;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

#uyari-kapat:hover {
    background: #333333;
    transform: scale(1.05);
}

#parlaklik-uyari.gizle {
    display: none;
}