:root {
  /* Dark Mode Variables */
  --bg-color: #1a1a1a;
  --text-color: #e0e0e0;
  --header-bg: linear-gradient(135deg, #0d1b2a, #1b263b);
  --nav-bg: #0d1b2a;
  --accent-color: #00d4ff;
  --secondary-text: #a0a0a0;
  --card-bg: #2f2f2f;
  --card-border: #415a77;
  --shadow-color: rgba(0, 0, 0, 0.8);
  --mission-bg: #252525;

  /* Yeni eklenen değişkenler */
  --transition-speed: 0.3s;
  --border-radius-sm: 5px;
  --border-radius-md: 8px;
  --border-radius-lg: 15px;
  --spacing-xs: 5px;
  --spacing-sm: 10px;
  --spacing-md: 20px;
  --spacing-lg: 30px;
  --spacing-xl: 60px;
  --font-size-sm: 0.85em;
  --font-size-base: 1em;
  --font-size-md: 1.2em;
  --font-size-lg: 1.5em;
  --font-size-xl: 2em;
  --font-size-xxl: 3em;
}

[data-theme="light"] {
  --bg-color: #f5f5f5;
  --text-color: #333333;
  --header-bg: linear-gradient(135deg, #e0f7fa, #b2ebf2);
  --nav-bg: #e0f7fa;
  --accent-color: #0288d1;
  --secondary-text: #666666;
  --card-bg: #ffffff;
  --card-border: #b0bec5;
  --shadow-color: rgba(0, 0, 0, 0.2);
  --mission-bg: #fafafa;
}

/* Erişilebilirlik için yardımcı sınıf */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

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

body {
  font-family: "Fira Code", monospace;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
  transition: all 0.3s ease;
}

header {
  background: var(--header-bg);
  padding: 60px 20px;
  text-align: center;
  box-shadow: 0 4px 20px var(--shadow-color);
  animation: fadeInDown 1.5s ease-out;
}

header h1 {
  font-size: 3em;
  color: var(--accent-color);
  text-shadow: 0 0 15px rgba(0, 212, 255, 0.7);
}

nav {
  background-color: var(--nav-bg);
  padding: 15px;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px var(--shadow-color);
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  margin: 0 30px;
  font-weight: bold;
  transition: all 0.4s ease;
}

nav a:hover {
  color: var(--accent-color);
  text-shadow: 0 0 10px var(--accent-color);
  transform: translateY(-3px);
}

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  z-index: 9999;
}

.theme-toggle:hover {
  border-color: var(--accent-color);
}

.theme-toggle i {
  color: var(--accent-color);
  font-size: 1.2em;
}

.container {
  max-width: 600px;
  margin: 60px auto;
  padding: 0 20px;
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(60px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideDown {
  from {
    max-height: 0;
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    max-height: 500px;
    opacity: 1;
    transform: translateY(0);
  }
}

/* Contact Sayfası için Ortak Stiller */
.contact-section {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 15px;
  border: 2px solid var(--card-border);
  box-shadow: 0 4px 15px var(--shadow-color);
  width: 100%;
  max-width: 600px;
  transition: all 0.3s ease;
  animation: slideInUp 0.8s ease-out forwards;
}

.contact-section:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 212, 255, 0.2);
  border-color: var(--accent-color);
}

.contact-section h2 {
  color: var(--accent-color);
  font-size: 2em;
  margin-bottom: 20px;
  text-align: center;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.contact-form label {
  font-size: 1.1em;
  color: var(--text-color);
}

.contact-form input,
.contact-form textarea {
  padding: 10px;
  border: 1px solid var(--card-border);
  border-radius: 5px;
  background: var(--bg-color);
  color: var(--text-color);
  font-family: "Fira Code", monospace;
  transition: border-color 0.3s ease;
  resize: none; /* Köşeden büyütmeyi devre dışı bırak */
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent-color);
  outline: none;
}

.contact-form button {
  padding: 10px;
  background: var(--accent-color);
  border: none;
  border-radius: 5px;
  color: var(--bg-color);
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s ease;
}

.contact-form button:hover {
  background: var(--accent-color);
}

.social-links {
  margin-top: 20px;
  text-align: center;
}

.social-links a {
  color: var(--accent-color);
  margin: 0 15px;
  font-size: 1.5em;
  transition: color 0.3s ease;
}

.social-links a:hover {
  color: #00ffea;
}

@media (max-width: 768px) {
  .container {
    flex-direction: column;
    align-items: center;
  }
  .contact-section {
    width: 100%;
  }
}