/* --- Sayfa Genel Yapısı --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: #050505; /* Simsiyah Arka Plan */
  color: #ffffff;
  font-family: 'Courier New', Courier, monospace; /* Tekno Font */
  display: flex;
  flex-direction: column; /* Öğeleri alt alta diz */
  align-items: center;    /* Yatay ortala */
  justify-content: center; /* Dikey ortala */
  min-height: 100vh;      /* Tam ekran */
}

/* --- Tarih Seçici Input --- */
input#datetime-picker {
  background-color: transparent;
  border: 2px solid #03e9f4;
  color: #fff;
  padding: 12px 20px;
  font-size: 1.1rem;
  font-family: inherit;
  outline: none;
  border-radius: 5px;
  text-align: center;
  margin-bottom: 25px; /* Butonla arayı aç */
  box-shadow: 0 0 5px #03e9f433; /* Hafif parlama */
  transition: 0.3s;
}

input#datetime-picker:focus {
  box-shadow: 0 0 20px #03e9f4; /* Tıklayınca parlasın */
}

/* --- Start Butonu --- */
button[data-start] {
  background: transparent;
  color: #03e9f4;
  border: 2px solid #03e9f4;
  padding: 10px 40px;
  font-size: 1.2rem;
  font-weight: bold;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 5px;
  margin-bottom: 50px; /* Timer ile arayı aç */
  transition: 0.3s;
  box-shadow: 0 0 10px #03e9f433;
}

button[data-start]:hover {
  background: #03e9f4;
  color: #050505; /* Yazı siyah */
  box-shadow: 0 0 20px #03e9f4, 0 0 40px #03e9f4; /* Neon Efekti */
}

button[data-start]:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

/* --- Timer Kutusu --- */
.timer {
  display: flex;
  gap: 20px; /* Kutular arası boşluk */
  margin-bottom: 40px;
}

/* Kutucuklar (Gün, Saat vb.) */
.field {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(3, 233, 244, 0.05); /* Çok hafif mavi zemin */
  border: 1px solid #03e9f4;
  padding: 20px;
  min-width: 100px; /* Sabit genişlik */
  border-radius: 8px;
  box-shadow: 0 0 15px rgba(3, 233, 244, 0.1);
}

/* Sayılar */
.value {
  font-size: 3rem;
  font-weight: bold;
  color: #fff;
  text-shadow: 0 0 15px #03e9f4; /* Rakamların parlaması */
  margin-bottom: 5px;
}

/* Etiketler (Days, Hours) */
.label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #03e9f4;
}

/* --- Go Back Linki --- */
a {
  color: #03e9f4; /* Mavi yazı */
  text-decoration: none;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  padding: 10px 20px;
  border: 1px solid transparent; /* Çerçeve yeri hazır olsun */
  transition: 0.3s;
}

a:hover {
  border: 1px solid #03e9f4;
  box-shadow: 0 0 10px #03e9f4;
  border-radius: 4px;
}