/* yachiyo.css */
:root {
  --primary: #ff66cc;
  --primary-hover: #ff99dd;
  --bg-gradient-start: #1a0033;
  --bg-gradient-end: #330066;
  --text: #ffffff;
  --card-bg: rgba(255, 255, 255, 0.1);
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  color: var(--text);
  min-height: 100vh;
  padding: 20px;
  line-height: 1.6;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  background: var(--card-bg);
  padding: 40px 30px;
  border-radius: 24px;
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

h1 {
  text-align: center;
  font-size: 2.4rem;
  margin-bottom: 8px;
  text-shadow: 0 0 15px rgba(255, 102, 204, 0.5);
}

.subtitle {
  text-align: center;
  margin-bottom: 30px;
  opacity: 0.9;
  font-size: 1.1rem;
}

textarea {
  width: 100%;
  height: 180px;
  padding: 18px;
  border-radius: 16px;
  border: none;
  font-size: 1.05rem;
  background: #ffffff;
  color: #222;
  resize: vertical;
  margin-bottom: 10px;
}

textarea:focus {
  outline: 3px solid var(--primary);
}

.buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 20px 0;
}

button {
  padding: 14px 28px;
  font-size: 1.05rem;
  font-weight: 600;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(255, 102, 204, 0.3);
}

button:hover {
  transform: translateY(-3px) scale(1.05);
  background: var(--primary-hover);
  box-shadow: 0 6px 20px rgba(255, 102, 204, 0.4);
}

h3 {
  margin: 25px 0 10px 0;
  font-size: 1.3rem;
}

#output {
  position: relative;
  margin-top: 10px;
  padding: 25px;
  background: rgba(0, 0, 0, 0.35);
  border-radius: 16px;
  min-height: 120px;
  white-space: pre-wrap;
  word-break: break-all;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 8px 16px;
  font-size: 0.95rem;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  border-radius: 30px;
  cursor: pointer;
  transition: 0.3s;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.35);
}

footer {
  text-align: center;
  margin-top: 40px;
  opacity: 0.75;
  font-size: 0.95rem;
}

footer a {
  color: #ff99dd;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* スマホ対応 */
@media (max-width: 600px) {
  .container {
    padding: 25px 20px;
  }
  h1 {
    font-size: 2rem;
  }
  .buttons {
    justify-content: center;
  }
}