/* --- 全局变量和基础样式 --- */
:root {
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --neutral: #4b5563;
  --neutral-light: #6b7280;
  --bg-dark: #1f2937;
  --bg-light: #374151;
  --bg-darker: #111827;
  --text: #f9fafb;
  --text-muted: #9ca3af;
  --border: #4b5563;
  --radius: 6px;
  --content-padding: 0;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text);
  padding: 20px;
  margin: 0;
  display: flex;
  justify-content: center;
  min-height: 100vh;
}

.app-container {
  width: 100%;
  max-width: 1200px;
  background-color: var(--bg-light);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

/* --- 顶部标题+按钮区域 --- */
.header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  margin-bottom: 20px;
  padding: 0 var(--content-padding);
}

.page-title {
  margin: 0;
  font-size: 1.8em;
  color: var(--text);
}

.button-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.button-group button {
  padding: 8px 14px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.95em;
  font-weight: 500;
  transition: background-color 0.2s ease;
  min-width: 90px;
}

#toggle-controls-btn {
  background-color: var(--primary);
  color: white;
}
#toggle-controls-btn:hover {
  background-color: var(--primary-light);
}

#toggle-preview-btn {
  background-color: var(--neutral);
  color: white;
}
#toggle-preview-btn:hover {
  background-color: var(--neutral-light);
}

#clear-text-btn {
  background-color: #ef4444;
  color: white;
}
#clear-text-btn:hover {
  background-color: #dc2626;
}

/* --- 设置面板样式 --- */
.controls-panel {
  background-color: var(--bg-darker);
  padding: 20px var(--content-padding);
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  align-items: center;
}

.controls-row:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.controls-row > div {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox-group input[type="checkbox"] {
  width: 16px;
  height: 16px;
}

/* --- 内容容器 --- */
.content-wrapper {
  width: 100%;
  padding: var(--content-padding);
}

/* --- 文本输入区域 --- */
.input-area {
  margin-bottom: 20px;
  width: 100%;
}

.text-input-wrapper {
  position: relative;
  width: 100%;
}

#text-input {
  width: 100%;
  min-height: 2.5em;
  max-height: 12em;
  padding: 10px 14px;
  padding-bottom: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--bg-darker);
  color: var(--text);
  font-size: 1.1em;
  resize: none;
  overflow-y: auto;
  line-height: 1.8;
  word-wrap: break-word;
  scrollbar-width: thin;
  scrollbar-color: transparent transparent;
}

#text-input:hover, #text-input:focus {
  scrollbar-color: var(--primary-light) transparent;
}

#text-input::-webkit-scrollbar {
  width: 6px;
  background: transparent;
}
#text-input::-webkit-scrollbar-thumb {
  background-color: transparent;
  border-radius: 3px;
}
#text-input:hover::-webkit-scrollbar-thumb,
#text-input:focus::-webkit-scrollbar-thumb {
  background-color: var(--primary-light);
}
#text-input::-webkit-scrollbar-track {
  background: transparent;
}

#text-input:focus {
  outline: none;
  border-color: var(--primary);
}

.char-count {
  position: absolute;
  right: 20px;
  bottom: 10px;
  color: var(--text-muted);
  font-size: 0.9em;
  pointer-events: none;
}

/* --- 文件上传和按钮样式 --- */
#font-upload {
  position: absolute;
  width: 0.1px;
  height: 0.1px;
  opacity: 0;
  overflow: hidden;
  z-index: -1;
}

#font-upload + label, #save-font-btn, #clear-font-btn {
  display: inline-block;
  padding: 6px 12px;
  background-color: var(--primary);
  color: white;
  border-radius: var(--radius);
  cursor: pointer;
  user-select: none;
  font-size: 0.9em;
  border: none;
  font-weight: 500;
}

#font-upload + label:hover, #save-font-btn:hover {
  background-color: var(--primary-light);
}

#clear-font-btn {
  background-color: #ef4444;
}

#clear-font-btn:hover {
  background-color: #dc2626;
}

#file-status {
  font-size: 0.9em;
  color: var(--text-muted);
}

/* --- 预览区域（字帖框） --- */
.preview-area {
  border: 1px solid var(--border);
  padding: 20px;
  background-color: var(--bg-darker);
  overflow: auto;
  border-radius: var(--radius);
  width: 100%;
}

.preview-area.hidden-preview .grid-cell > span:not(.lines) {
  opacity: 0;
}

/* --- 核心：字帖网格布局 --- */
#calligraphy-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(70px, 1fr));
  gap: 10px;
  justify-items: center;
  transition: transform 0.2s ease;
  transform-origin: top left;
}

/* --- 核心：单个田字格的样式 --- */
.grid-cell {
  width: 70px;
  height: 70px;
  /* --- 修改点：将实线边框改为虚线边框 --- */
  border: 1px solid #999;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 42px;
  position: relative;
  font-family: sans-serif;
  background-color: var(--bg-darker);
}

/* --- 核心：在格子内部创建一个用于画线的元素 --- */
.grid-cell .lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* --- 田字格的十字线 --- */
.grid-cell .lines::before,
.grid-cell .lines::after {
  content: '';
  position: absolute;
  background-color: #666;
}

.grid-cell .lines::before {
  width: 90%;
  height: 1px;
  top: 50%;
  left: 5%;
  transform: translateY(-50%);
}

.grid-cell .lines::after {
  height: 90%;
  width: 1px;
  left: 50%;
  top: 5%;
  transform: translateX(-50%);
}

/* --- 米字格的对角线 --- */
.grid-cell.mi::before,
.grid-cell.mi::after {
  content: '';
  position: absolute;
  width: 1px;
  height: 141%;
  background-color: #666;
  top: -20.5%;
  left: 50%;
  transform-origin: center center;
}

.grid-cell.mi::before {
  transform: translateX(-50%) rotate(45deg);
}

.grid-cell.mi::after {
  transform: translateX(-50%) rotate(-45deg);
}


/* --- 响应式设计 --- */
@media (max-width: 768px) {
  body {
    padding: 10px;
  }
  .app-container {
    padding: 15px;
  }
  .header-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .button-group {
    width: 100%;
    justify-content: space-between;
  }
  .controls-row > div {
    width: 100%;
  }
}
/* 刷新字体按钮样式（和其他按钮保持一致） */
#refresh-font-btn {
    /* 复用已有按钮的基础样式（如果已有.button-group button样式，只需加差异化） */
    padding: 6px 12px;
    margin-left: 8px;
    border: none;
    border-radius: 4px;
    background-color: #2563eb; /* 蓝色系，和展开设置按钮呼应 */
    color: white;
    cursor: pointer;
    font-size: 14px;
}

#refresh-font-btn:hover {
    background-color: #1d4ed8; /*  hover 加深 */
}

#refresh-font-btn:active {
    background-color: #1e40af; /* 点击态 */
}

/* 若原有按钮有统一样式（.button-group button），可只加： */
/*
.button-group #refresh-font-btn {
    margin-left: 8px;
    background-color: #2563eb;
}
*/