:root {
  --primary: #4361ee;
  --primary-hover: #3a56d4;
  --upload-color: #007bff;
  --convert-color: #fd7e14;
  --border: #dee2e6;
  --bg-light: #f8f9fa;
  --text-light: #212529;
  --card-light: #ffffff;
}

body.dark-theme {
  --primary: #3f37c9;
  --primary-hover: #2a27af;
  --upload-color: #0d6efd;
  --convert-color: #ff922b;
  --border: #495057;
  --bg-light: #212529;
  --text-light: #f8f9fa;
  --card-light: #2b3035;
}

html, body {
  height: 100%;
  overflow-x: hidden; /* Kaydırma çubuğu için sabit alan ayırır */
  position: relative;
}

body {
  background-color: var(--bg-light);
  color: var(--text-light);
  font-family: 'Open Sans', sans-serif;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  position: relative;
}

header, footer {
  background-color: var(--card-light);
  padding: 1rem 2rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
  max-width: 100vw;
}

header .logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
}

.controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.theme-switch, .language-switch {
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.3s ease, transform 0.3s ease;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
}

.theme-switch:hover, .language-switch:hover {
  background-color: var(--border);
}

.controls .material-icons {
  font-size: 24px;
  color: var(--text-light);
}

.language-menu {
  opacity: 0;
  transform: translateY(-10px);
  transform: scaleY(0);
  transform-origin: top right;
  transition: transform 0.2s ease-out, opacity 0.2s ease-out;
  position: fixed;
  top: 65px;
  width: auto;
  max-width: 85px;
  overflow: hidden;
  background-color: var(--card-light);
  border: 2px solid var(--border);
  border-radius: 10px;
  z-index: 1000;
  pointer-events: none;
}

.language-menu.active {
  opacity: 1;
  transform: scaleY(1);
  pointer-events: auto;
}

.language-menu button {
  width: 100%;
  padding: 0.5rem 1rem;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  color: var(--text-light);
}

.language-menu button:hover {
  background-color: var(--border);
}

main {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  justify-content: center;
}

.conversion-container {
  width: calc(100% - 32px);
  max-width: 800px;
  background-color: var(--card-light);
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  padding: 2rem;
  margin-bottom: auto;
  text-align: center;
  box-sizing: border-box;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
  flex-direction: column;
  display: flex;
}

/* Sekme yapısı */
.tabs {
  position: relative;
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
}

/* Her sekme */
.tab {
  flex: 1;
  text-align: center;
  padding: 0.75rem;
  cursor: pointer;
  opacity: 0.7;
  font-weight: 700;
  transition: color 0.3s ease;
  color: #888;
  display: block;
}

.tab.active {
  opacity: 1;
  color: var(--primary);
}

/* Alt çizgi (indicator) */
.tab-indicator {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background-color: var(--primary);
  width: 0;
  transition: left 0.25s ease, width 0.25s ease;
}

/* Eğer HTML'de tab-text varsa, normal blok gibi göster; old-color'u görünür yap */
.tab-text {
  position: relative;
  display: inline-block;
  white-space: nowrap;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

/* old-color asıl metin: göster */
.old-color {
  display: inline-block;
}

/* new-color tamamen gizli */
.new-color {
  display: none;
}

/* DOSYA YÜKLEME ALANI */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 3rem 2rem;
  text-align: center;
  margin-bottom: 1.5rem;
  cursor: pointer;
  position: relative;
  transition: border-color 0.4s;
}

.upload-area:hover {
  border-color: var(--primary);
  -webkit-tap-highlight-color: transparent !important;
}

.upload-icon {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.upload-text {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.upload-subtext {
  opacity: 0.7;
  font-size: 0.9rem;
}

.file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.file-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  margin-bottom: 0.75rem;
  text-align: left;
}

.file-name {
  font-weight: 700;
}

.file-size {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-left: 0.5rem;
}

.progress-bar-container {
  width: 100%;
  background-color: var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.progress-bar {
  height: 10px;
  width: 0%;
  background-color: var(--upload-color);
  transition: width 0.4s ease;
}

.btn {
  padding: 0.75rem 1.5rem;
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  margin-top: 1rem;
  font-weight: 700;
  transition: background-color 0.5s, transform 0.15s;
}

.btn:disabled {
  background-color: #cccccc;
  cursor: not-allowed;
  pointer-events: none;
}

footer {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  background-color: var(--card-light);
  color: var(--text-light);
  width: 100%;
  margin-top: auto;
  bottom: 0;
  padding: 0.5rem 1rem;
  position: relative;
  flex-shrink: 0;
  box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

.footer-content {
  display: flex;
  align-items: center;
  gap: 10px;
}

.github-icon {
  width: 80px;
  height: 40px;
  border-radius: 20px;
  transition: background-color 0.6s ease, transform 0.3s ease;
}

.github-link:hover .github-icon {
  border-radius: 20px;
  background-color: var(--border);
  -webkit-tap-highlight-color: transparent !important;
}

footer p {
  margin: 0;
  font-weight: bold;
}

@media (max-width: 768px) {
  body {
    overflow-x: hidden !important;
    width: 100vw;
    z-index: 1;
  }

  header {
    padding: 6px 10px !important;
    min-height: 40px;
    flex-wrap: nowrap;
    position: relative;
    z-index: 1;
    max-width: 100vw;
    overflow-x: hidden;
  }

  header .logo {
    font-size: 0.85rem !important;
    gap: 3px !important;
    white-space: nowrap;
    max-width: 70%;
  }

  header .logo svg {
    width: 16px !important;
    height: 16px !important;
    flex-shrink: 0;
  }

  .controls {
    gap: 5px;
    flex-shrink: 0;
    max-width: 30%;
    z-index: 2;
    position: relative;
  }

  .theme-switch, .language-switch {
    padding: 3px;
  }

/* Varsayılan menü durumu: görünmez, yukarı kaymış, tıklanamaz */
.language-menu {
  position: absolute;      /* Yine sabit/bağıl konumlama */
  top: 100%;              /* Butonun altından başlasın */
  right: 0;
  transform: translateY(-10px);
  opacity: 0;
  pointer-events: none;    /* Tıklamayı devre dışı bırak */
  transition: transform 0.2s ease-out, opacity 0.2s ease-out;
  background-color: var(--card-light);
  border: 2px solid var(--border);
  border-radius: 4px;
  z-index: 1000;
  transform: scaleY(0);
  transform-origin: top right;
  position: fixed;
  top: 45px;
  right: 10px;
  width: auto;
  max-width: 85px;
  overflow: hidden;
  z-index: 10;
  pointer-events: none;
  /* Eğer max-width vs. istersen ekleyebilirsin */
}

/* Menü aktifleşince: translate ve opacity değerleri normale */
.language-menu.active {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;    /* Artık tıklanabilir */
  }

  .controls .material-icons {
    font-size: 16px !important;
  }

  .tab {
    padding: 0.4rem;
    font-size: 0.75rem;
    min-width: 50%;
    box-sizing: border-box;
  }

  .tab-text {
    font-size: 0.75rem;
    line-height: 1.1;
    display: inline-flex;
    max-width: 100%;
  }

  .tab-indicator {
    height: 1.5px;
  }

  .upload-area {
    width: calc(100%);
    height: 200px;
    box-sizing: border-box;
  }

  .upload-icon {
    font-size: 1.8rem !important;
    margin-bottom: 0.3rem;
  }

  .upload-text {
    font-size: clamp(0.7rem, vw, 1rem);
    margin-bottom: 0.2rem;
    line-height: 1.2;
    word-break: break-word;
    justify-content: center;
  }

  .upload-subtext {
    font-size: 0.7rem !important;
  }

  main {
    padding: 0.8rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-width: 100vw;
    overflow-x: hidden;
  }

  .conversion-container {
    width: calc(100% - 32px) !important;
    margin: 0 16px !important;
    padding: 1.2rem !important;
    max-width: none;
  }

  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    margin-top: 0.8rem;
    width: 100%;
    max-width: 100%;
  }

  footer {
    padding: 0.4rem !important;
    height: auto;
    bottom: 0;
    max-width: 100vw;
    overflow: hidden;
  }

  .footer-content {
    gap: 5px;
    transform: scale(0.95);
    flex-wrap: nowrap;
  }

  .github-icon {
    width: 60px !important;
    height: 25px !important;
    max-width: 100%;
  }

  footer p {
    font-size: 0.7rem !important;
    white-space: nowrap;
  }

  .file-name {
    font-size: 0.8rem;
    word-break: break-all;
  }

  .file-size {
    font-size: 0.75rem;
  }

  * {
    max-width: 100%;
    box-sizing: border-box;
  }
}