/* TEMEL STİLLER */
:root {
  --primary-color: #e74c3c;
  --primary-hover: #c0392b;
  --secondary-color: #95a5a6;
  --secondary-hover: #7f8c8d;
  --text-color: #2c3e50;
  --light-color: #f5f5f5;
  --white: #ffffff;
  --success-color: #27ae60;
  --error-color: #e74c3c;
  --border-radius: 6px;
  --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--light-color);
  color: var(--text-color);
  line-height: 1.6;
  padding: 20px;
}

/* KONTEYNER VE BAŞLIK */
.container {
  max-width: 800px;
  margin: 40px auto;
  padding: 30px;
  background-color: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

h1 {
  text-align: center;
  color: var(--text-color);
  margin-bottom: 30px;
  font-weight: 600;
  font-size: 2rem;
}

/* FORM ELEMANLARI */
.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-color);
}

input[type="text"],
input[type="email"],
textarea,
select {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
  background-color: var(--white);
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus,
select:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 2px rgba(231, 76, 60, 0.2);
}

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

/* SELECT ÖZELLEŞTİRME */
select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
}

/* BUTONLAR */
.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 15px;
  margin-top: 25px;
}

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-submit {
  background-color: var(--primary-color);
  color: var(--white);
}

.btn-submit:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
}

.btn-clear {
  background-color: var(--secondary-color);
  color: var(--white);
}

.btn-clear:hover {
  background-color: var(--secondary-hover);
}

/* LIGHTBOX */
.lightbox {
  display: none;
  position: fixed;
  z-index: 1000;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(3px);
}

.lightbox-content {
  background-color: var(--white);
  margin: 15% auto;
  padding: 30px;
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 500px;
  position: relative;
  box-shadow: 0 5px 30px rgba(0, 0, 0, 0.3);
  animation: fadeIn 0.3s;
}

.close-lightbox {
  position: absolute;
  top: 15px;
  right: 25px;
  font-size: 1.75rem;
  font-weight: bold;
  color: #aaa;
  cursor: pointer;
  transition: var(--transition);
}

.close-lightbox:hover {
  color: var(--text-color);
}

/* HATA MESAJI */
.error-message {
  color: var(--error-color);
  animation: blink 1s linear infinite;
  font-weight: 500;
  margin: 15px 0;
}

/* ANİMASYONLAR */
@keyframes blink {
  0% { opacity: 1; }
  50% { opacity: 0.3; }
  100% { opacity: 1; }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* RESPONSIVE TASARIM */
@media (max-width: 768px) {
  .container {
    margin: 20px auto;
    padding: 20px;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .lightbox-content {
    margin: 30% auto;
    padding: 20px;
  }
}

@media (max-width: 480px) {
  body {
    padding: 10px;
  }
  
  h1 {
    font-size: 1.5rem;
  }
  
  input[type="text"],
  input[type="email"],
  textarea,
  select {
    padding: 10px 12px;
  }
}