:root {
  --bg-color: #282c34;
  --container-bg: #2d323a;
  --input-bg: #383e47;
  --code-bg: #282c34;
  --primary-color: #69b4ff;
  --primary-hover: #50a0ff;
  --text-color: #fff;
  --muted-text: #a0a0a0;
  --error-color: #ff6b6b;
}

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

body {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  color: var(--text-color);
}

.container {
  background-color: var(--container-bg);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  width: 100%;
  max-width: 380px;
  margin: 16px;
}

@media (min-width: 768px) {
  .container {
    padding: 40px;
    max-width: 480px;
  }
}

a {
  color: var(--text-color);
}

h1 {
  text-align: center;
  margin-bottom: 32px;
  font-size: 28px;
  font-weight: 600;
}

@media (min-width: 768px) {
  h1 {
    font-size: 32px;
    margin-bottom: 40px;
  }
}

.input-group {
  margin-bottom: 20px;
}

@media (min-width: 768px) {
  .input-group {
    margin-bottom: 24px;
  }
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  font-size: 14px;
}

input[type="text"] {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid transparent;
  background-color: var(--input-bg);
  border-radius: 6px;
  font-size: 16px;
  color: var(--text-color);
  transition: border-color 0.2s;
}

@media (min-width: 768px) {
  input[type="text"] {
    padding: 14px 16px;
  }
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--primary-color);
}

button {
  background-color: var(--primary-color);
  color: var(--text-color);
  border: none;
  padding: 14px 16px;
  border-radius: 6px;
  font-size: 16px;
  cursor: pointer;
  width: 100%;
  transition: background-color 0.3s;
  font-weight: 500;
}

@media (min-width: 768px) {
  button {
    padding: 16px 20px;
  }
}

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

.result {
  margin-top: 24px;
  padding: 16px;
  background-color: var(--input-bg);
  border-radius: 6px;
  display: none;
}

@media (min-width: 768px) {
  .result {
    padding: 20px;
  }
}

.code-container {
  background-color: var(--code-bg);
  border-radius: 6px;
  padding: 12px 8px;
  margin: 8px 0 16px;
  text-align: center;
}

@media (min-width: 768px) {
  .code-container {
    padding: 12px 16px;
    margin: 12px 0;
  }
}

.code {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 2px;
}

.timer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted-text);
}

@media (min-width: 768px) {
  .timer {
    margin-top: 16px;
  }
}

.timer-text {
  flex-grow: 1;
}

.copy-button {
  background-color: transparent;
  color: var(--primary-color);
  border: none;
  padding: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: color 0.2s;
  width: auto;
  display: flex;
  align-items: center;
  position: relative;
}

@media (min-width: 768px) {
  .copy-button {
    padding: 6px 12px;
  }
}

.copy-button:hover {
  color: var(--text-color);
}

.copy-tooltip {
  position: absolute;
  top: -32px;
  right: 0;
  background-color: var(--primary-color);
  color: var(--text-color);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.progress-bar {
  height: 4px;
  background-color: rgba(255, 255, 255, 0.1);
  margin-top: 8px;
  border-radius: 2px;
  overflow: hidden;
}

.progress {
  height: 100%;
  background-color: var(--primary-color);
  width: 100%;
  transition: width 1s linear;
}

.error-message {
  color: var(--error-color);
  text-align: center;
  margin-top: 12px;
  display: none;
  font-size: 14px;
}

.note {
  margin-top: 24px;
  color: var(--muted-text);
  font-size: 12px;
  text-align: center;
  line-height: 1.6;
}

.copy-svg {
  width: 16px;
  height: 16px;
  fill: var(--primary-color);
}

@supports (-webkit-touch-callout: none) {
  input,
  button {
    padding-left: 14px;
    padding-right: 14px;
  }
}