/* ----- 全局样式:柔和、现代、响应式 ----- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', sans-serif;
}

body {
  background: linear-gradient(145deg, #f9f7f3 0%, #f0efe9 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

/* 返回首页按钮 */
.back-home-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1.5px solid #d4cdc0;
  border-radius: 50px;
  color: #2e3b3b;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  margin-bottom: 1rem;
}

.back-home-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(154, 171, 154, 0.4);
  border-color: #9aab9a;
  background: rgba(255, 255, 255, 1);
}

.tool-wrapper {
  max-width: 1300px;
  width: 100%;
  margin: 0 auto;
}

/* 主卡片容器 */
.main-card {
  background: rgba(255, 255, 245, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 2.5rem;
  box-shadow: 0 20px 40px -8px rgba(0, 20, 30, 0.15), 0 6px 12px rgba(0, 0, 0, 0.05);
  padding: 2.2rem 2rem;
  border: 1px solid rgba(230, 220, 210, 0.4);
}

h1 {
  font-size: 2.2rem;
  font-weight: 550;
  letter-spacing: -0.01em;
  color: #2e3b3b;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 0.25rem;
  border-bottom: 2px solid #d4cdc0;
  padding-bottom: 1.2rem;
}

h1 span {
  background: #d9d0c1;
  color: #2e3b3b;
  font-size: 1rem;
  font-weight: 500;
  padding: 0.2rem 1rem;
  border-radius: 40px;
  margin-left: 12px;
  opacity: 0.8;
}

.subhead {
  color: #5b6b6b;
  margin-bottom: 2.2rem;
  font-size: 1rem;
  font-weight: 400;
  padding-left: 0.3rem;
}

/* 单列布局:汉字→拼音 */
.convert-section {
  display: block;
  max-width: 800px;
  margin: 0 auto;
}

@media (max-width: 700px) {
  body { padding: 1rem; }
  .main-card { padding: 1.5rem; }
  .convert-section { max-width: 100%; }
  h1 { font-size: 1.8rem; }
  
  /* 移动端调整返回首页按钮 */
  .back-home-btn {
    padding: 0.45rem 0.9rem;
    font-size: 0.8rem;
  }
}

/* 卡片内分区 */
.section {
  background: #ffffffd6;
  border-radius: 1.8rem;
  padding: 1.8rem 1.6rem;
  box-shadow: inset 0 1px 3px rgba(255,255,255,0.9), 0 8px 18px -8px rgba(40, 30, 20, 0.08);
  border: 1px solid #ece5db;
}

.section-title {
  display: flex;
  align-items: baseline;
  margin-bottom: 1.4rem;
}

.section-title h2 {
  font-size: 1.6rem;
  font-weight: 500;
  color: #3a4a4a;
}

.section-title .badge {
  background: #b7c4b1;
  margin-left: 12px;
  padding: 0.2rem 0.8rem;
  border-radius: 30px;
  font-size: 0.8rem;
  color: #1e2b2b;
  font-weight: 450;
}

/* 输入框区域 */
.input-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: #4f5e5e;
  margin-bottom: 8px;
  letter-spacing: 0.3px;
}

textarea, input {
  width: 100%;
  padding: 1rem 1.2rem;
  font-size: 1.1rem;
  background: #fefcf9;
  border: 1.5px solid #ddd6cb;
  border-radius: 28px;
  outline: none;
  transition: all 0.2s ease;
  color: #1f2a2a;
  resize: vertical;
  font-family: inherit;
  box-shadow: inset 2px 2px 6px rgba(0,0,0,0.02);
}

textarea:focus, input:focus {
  border-color: #9aab9a;
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(150, 170, 140, 0.15);
}

textarea {
  min-height: 100px;
  line-height: 1.5;
}

/* 按钮组 */
.button-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 18px;
}

.btn {
  background: #e7e1d7;
  border: none;
  padding: 0.7rem 1.6rem;
  border-radius: 60px;
  font-size: 0.95rem;
  font-weight: 500;
  color: #2e3b3b;
  cursor: pointer;
  transition: 0.15s;
  border: 1px solid #cfc7bb;
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  backdrop-filter: blur(5px);
}

.btn-primary {
  background: #9aab9a;
  border-color: #7e917e;
  color: #fefcf7;
  box-shadow: 0 8px 14px -8px rgba(70, 90, 70, 0.3);
  font-weight: 550;
}

.btn-primary:hover {
  background: #849784;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1.5px solid #c9bfb2;
  box-shadow: none;
}

.btn-outline:hover {
  background: #e7dfd4;
  border-color: #a69b8d;
}

.btn:active {
  transform: translateY(1px);
  box-shadow: none;
}

/* 结果展示区 */
.result-area {
  background: #f5f2ec;
  border-radius: 24px;
  padding: 1.4rem 1.4rem;
  margin: 10px 0 6px;
  border: 1px solid #e0d6ca;
}

.result-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: #6b7a7a;
  margin-bottom: 10px;
}

.pinyin-output {
  font-size: 1.8rem;
  font-weight: 450;
  line-height: 1.4;
  word-break: break-word;
  color: #1e3a3a;
  font-family: 'Noto Serif SC', 'Times New Roman', serif;
  min-height: 4rem;
}

/* 候选词列表 (拼音转汉字) */
.candidate-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: center;
  min-height: 3.5rem;
}

.candidate-chip {
  background: #ffffffc7;
  padding: 0.6rem 1.3rem;
  border-radius: 50px;
  font-size: 1.3rem;
  font-weight: 480;
  color: #1e3a3a;
  border: 1px solid #cfc2b2;
  box-shadow: 0 2px 6px rgba(0,0,0,0.02);
  backdrop-filter: blur(4px);
  transition: all 0.1s;
  cursor: default;
  font-family: 'Noto Serif SC', serif;
}

.hint-note {
  color: #7a8a8a;
  font-size: 0.85rem;
  margin-top: 14px;
  font-style: italic;
  border-left: 3px solid #b7c4b1;
  padding-left: 16px;
}

/* 底部信息 */
.footer-note {
  margin-top: 2.5rem;
  padding-top: 1.2rem;
  border-top: 1px dashed #ccc6bb;
  font-size: 0.85rem;
  color: #5b6767;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.small-badge {
  background: #dbd2c6;
  padding: 0.2rem 0.9rem;
  border-radius: 30px;
  color: #2c3a3a;
}

.error-message {
  color: #b15e5e;
  font-weight: 450;
}

/* 清空/复制图标占位 (用文字) */
i.emoji-icon {
  font-style: normal;
  filter: none;
}