* {
  box-sizing: border-box;
}

:root {
  --page-bg: #060d11;
  --panel-bg: #0d171c;
  --card-bg: #101c22;
  --input-bg: #071014;
  --border: #263940;
  --border-focus: #55d6be;
  --text: #f4fbfa;
  --muted: #b7c8c7;
  --accent: #55d6be;
  --accent-hover: #70e3cf;
  --button-bg: #16262d;
  --button-hover: #20343c;
  --success: #74e0c9;
  --error: #ff8b8b;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at top, #102027 0%, var(--page-bg) 48%, #050a0d 100%);
  color: var(--text);
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
}

.converter {
  width: 100%;
  min-height: 100vh;
  padding: 30px 18px;
}

.container {
  width: 100%;
  max-width: 1150px;
  margin: 0 auto;
  padding: 28px;
  background: linear-gradient(145deg, #091217, #0d181d);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.header {
  text-align: center;
  margin-bottom: 28px;
}

.header h1 {
  margin: 0 0 8px;
  color: #ffffff;
  font-size: 32px;
  line-height: 1.2;
  font-weight: 700;
}

.header p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.editor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.card {
  min-width: 0;
  padding: 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 11px;
}

.card-header h2 {
  margin: 0;
  color: #ffffff;
  font-size: 17px;
  font-weight: 700;
}

.card-header span {
  color: var(--muted);
  font-size: 12px;
}

textarea {
  display: block;
  width: 100%;
  min-height: 370px;
  padding: 16px;
  resize: vertical;
  border: 1px solid #30454d;
  border-radius: 12px;
  outline: none;
  background: var(--input-bg) !important;
  color: #f7ffff !important;
  -webkit-text-fill-color: #f7ffff !important;
  caret-color: #ffffff !important;
  font-family: Consolas, "Courier New", monospace;
  font-size: 14px;
  line-height: 1.65;
}

textarea::placeholder {
  color: #9db0af !important;
  opacity: 1;
}

textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(85, 214, 190, 0.1);
}

textarea::selection {
  background: #225f56;
  color: #ffffff;
}

.actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 9px;
  margin: 20px 0 10px;
}

button {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 17px;
  background: var(--button-bg);
  color: #eaf5f3;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  background: var(--button-hover);
  border-color: #3e5a63;
}

button:active {
  transform: translateY(0);
}

button.primary {
  min-width: 175px;
  background: var(--accent);
  color: #061311;
  border-color: var(--accent);
}

button.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.status {
  min-height: 24px;
  margin-top: 8px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

.status.success {
  color: var(--success);
}

.status.error {
  color: var(--error);
}

footer {
  margin-top: 20px;
  color: #819593;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 760px) {
  .converter {
    padding: 15px 10px;
  }

  .container {
    padding: 17px;
    border-radius: 15px;
  }

  .header h1 {
    font-size: 25px;
  }

  .editor-grid {
    grid-template-columns: 1fr;
  }

  textarea {
    min-height: 290px;
  }

  button {
    flex: 1 1 auto;
  }

  button.primary {
    width: 100%;
  }
}