/* ===== 基础样式 & CSS 变量 ===== */

:root {
  /* 手帐粉彩系 - 浅色模式 */
  --color-bg: #fdf8f4;
  --color-surface: #ffffff;
  --color-surface-hover: #faf6f2;
  --color-text: #3d3d3d;
  --color-text-secondary: #8a8a8a;
  --color-border: #e8e0d8;
  --color-border-light: #f0ebe5;

  --color-accent: #e8b4b8;
  --color-accent-light: #f5e1e3;
  --color-accent-dark: #d4959a;

  --color-success: #a8d5ba;
  --color-success-light: #e3f2e8;
  --color-warning: #f5d491;
  --color-warning-light: #fdf5e3;
  --color-error: #e8a4a4;
  --color-error-light: #fce8e8;

  --color-morning: #a8d5ba;
  --color-afternoon: #f5d491;
  --color-evening: #e8b4b8;

  /* 字体 */
  --font-display: 'ZCOOL KuaiLe', cursive;
  --font-body: 'Noto Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
  --font-mono: 'Courier New', monospace;

  /* 间距 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-inset: inset 0 1px 2px rgba(0,0,0,0.04);

  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* 布局 */
  --sidebar-width: 200px;
  --sidebar-collapsed: 60px;
  --header-height: 56px;
}

/* 暗黑模式 */
[data-theme="dark"] {
  --color-bg: #1a1a2e;
  --color-surface: #16213e;
  --color-surface-hover: #1a2744;
  --color-text: #e8e0d8;
  --color-text-secondary: #a0a0b0;
  --color-border: #2a2a4a;
  --color-border-light: #333355;

  --color-accent: #c9969a;
  --color-accent-light: #4a3a4a;
  --color-accent-dark: #b08085;

  --color-success: #7db89a;
  --color-success-light: #2a4a3a;
  --color-warning: #d4b872;
  --color-warning-light: #4a4020;
  --color-error: #c97a7a;
  --color-error-light: #4a2a2a;

  --color-morning: #7db89a;
  --color-afternoon: #d4b872;
  --color-evening: #c9969a;
}

/* ===== 重置 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ===== 通用类 ===== */
.handwritten-title {
  font-family: var(--font-display);
  letter-spacing: 2px;
  font-weight: 400;
}

.paper-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

/* 横线纸背景 */
.lined-paper {
  background-image: repeating-linear-gradient(
    transparent,
    transparent 27px,
    var(--color-border) 27px,
    var(--color-border) 28px
  );
  line-height: 28px;
  background-attachment: local;
}

/* 点阵背景 */
.dot-paper {
  background-image: radial-gradient(circle, var(--color-border) 0.8px, transparent 0.8px);
  background-size: 16px 16px;
}

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-accent);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  font-size: 18px;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

/* ===== 输入框 ===== */
input[type="text"],
input[type="password"],
textarea {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--color-text);
  transition: border-color var(--transition-fast);
  outline: none;
}

input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

/* ===== 复选框自定义 ===== */
input[type="checkbox"] {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  flex-shrink: 0;
}

input[type="checkbox"]:checked {
  background: var(--color-success);
  border-color: var(--color-success);
}

input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 12px;
  font-weight: bold;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-pill);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-secondary);
}

/* ===== 工具类 ===== */
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}