/* ============================================================
   在线工具集合 · 设计系统样式
   基于 Ant Design 5.x 视觉体系 (style.html)
   ============================================================ */

:root {
  /* 主色板 */
  --primary: #1677ff;
  --primary-hover: #4096ff;
  --primary-active: #0958d9;
  --primary-light: #e7f1ff;
  --primary-lighter: #f0f6ff;
  --primary-soft: #dee2f9;
  --brand-deep: #275eff;
  --indigo: #2f54eb;

  /* 文字 */
  --text-primary: rgba(0, 0, 0, 0.88);
  --text-secondary: rgba(0, 0, 0, 0.65);
  --text-tertiary: rgba(0, 0, 0, 0.45);
  --text-disabled: rgba(0, 0, 0, 0.25);

  /* 背景 */
  --bg-base: #ffffff;
  --bg-soft: #f7f8f9;
  --bg-muted: #eff1f9;
  --bg-page: #f9fafb;
  --bg-dark: #001529;

  /* 边框 */
  --border-base: #d9d9d9;
  --border-light: #e6e8eb;
  --border-soft: #f0f0f0;

  /* 状态色 */
  --success: #52c41a;
  --warning: #faad14;
  --error: #ff4d4f;
  --info: #1677ff;
  --magenta: #eb2f96;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-pill: 99px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03), 0 1px 6px -1px rgba(0, 0, 0, 0.02), 0 2px 4px 0 rgba(0, 0, 0, 0.02);
  --shadow-md: 0 6px 16px 0 rgba(0, 0, 0, 0.08), 0 3px 6px -4px rgba(0, 0, 0, 0.12), 0 9px 28px 8px rgba(0, 0, 0, 0.05);
  --shadow-focus: 0 0 0 2px rgba(22, 119, 255, 0.1);

  /* 间距 */
  --sidebar-w: 220px;
  --header-h: 60px;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  color: var(--text-primary);
  background: var(--bg-page);
  line-height: 1.5715;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 600; color: var(--text-primary); }

/* ============================================================
   布局：顶栏 + 侧栏 + 主区
   ============================================================ */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: #fff;
  border-bottom: 1px solid var(--border-light);
  box-shadow: 0 1px 4px rgba(0, 21, 41, 0.04);
  display: flex;
  align-items: center;
  padding: 0 20px;
}
.app-header .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  width: calc(var(--sidebar-w) - 20px);
}
.app-header .brand img { width: 32px; height: 32px; border-radius: 6px; }
.app-header .brand .brand-name { font-size: 16px; font-weight: 600; color: var(--text-primary); white-space: nowrap; }

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  color: var(--text-secondary);
}
.menu-toggle:hover { background: var(--primary-lighter); color: var(--primary); }
.menu-toggle svg { width: 22px; height: 22px; }

.header-spacer { flex: 1; }
.header-link {
  color: var(--text-secondary);
  font-size: 13px;
}
.header-link:hover { color: var(--primary); }

.app-body { display: flex; align-items: flex-start; }

.app-sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: #fff;
  border-right: 1px solid var(--border-light);
  min-height: calc(100vh - var(--header-h));
  padding: 16px 12px;
  position: sticky;
  top: var(--header-h);
}
.nav-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.nav-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 14px;
  transition: all 0.2s;
}
.nav-list a svg { width: 18px; height: 18px; flex-shrink: 0; }
.nav-list a:hover { background: var(--primary-lighter); color: var(--primary); }
.nav-list a.active { background: var(--primary-light); color: var(--primary-active); font-weight: 500; }

.app-main {
  flex: 1;
  min-width: 0;
  padding: 24px 32px 64px;
  max-width: 1600px;
}

/* 遮罩（移动端） */
.sidebar-mask {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  z-index: 90;
}

/* ============================================================
   通用组件
   ============================================================ */
.page-header { margin-bottom: 20px; }
.page-header h2 {
  font-size: 22px;
  font-weight: 600;
  border-left: 4px solid var(--primary);
  padding-left: 12px;
  line-height: 1.3;
}
.page-header .page-description { color: var(--text-tertiary); font-size: 13px; margin: 8px 0 0 16px; }

.card {
  background: #fff;
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}
.card-shadow { box-shadow: var(--shadow-sm); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 32px;
  padding: 0 16px;
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  font-weight: 400;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
  line-height: 1;
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); color: #fff; }
.btn-primary:active { background: var(--primary-active); border-color: var(--primary-active); }
.btn-default { background: #fff; color: var(--text-primary); border-color: var(--border-base); }
.btn-default:hover { color: var(--primary-hover); border-color: var(--primary-hover); }
.btn-danger { background: #fff; color: var(--error); border-color: #ffccc7; }
.btn-danger:hover { background: #fff1f0; border-color: var(--error); }
.btn-text { background: transparent; color: var(--primary); }
.btn-text:hover { background: var(--primary-lighter); }
.btn-lg { height: 40px; padding: 0 20px; font-size: 15px; }
.btn-sm { height: 24px; padding: 0 12px; font-size: 12px; }
.btn:disabled, .btn-disabled { background: #f5f5f5; color: var(--text-disabled); border-color: var(--border-base); cursor: not-allowed; }
.btn:disabled:hover { background: #f5f5f5; color: var(--text-disabled); border-color: var(--border-base); }
.btn-block { width: 100%; }

/* 输入框 */
.input, .textarea, .select {
  height: 32px;
  padding: 0 12px;
  border: 1px solid var(--border-base);
  border-radius: 6px;
  background: #fff;
  font-size: 14px;
  font-family: inherit;
  color: var(--text-primary);
  transition: all 0.2s;
  width: 100%;
}
.textarea { height: auto; padding: 8px 12px; line-height: 1.6; resize: vertical; }
.select { cursor: pointer; appearance: none; background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23bfbfbf' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px; }
.input:focus, .textarea:focus, .select:focus { outline: none; border-color: var(--primary); box-shadow: var(--shadow-focus); }
.input:disabled, .textarea:disabled { background: #f5f5f5; color: var(--text-disabled); cursor: not-allowed; }
.input-lg { height: 40px; font-size: 15px; }

label.field-label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 6px; font-weight: 500; }

/* 表单行 */
.form-row { margin-bottom: 16px; }
.form-row:last-child { margin-bottom: 0; }
.form-inline { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

/* 单选 / 多选 */
.radio-group { display: inline-flex; flex-wrap: wrap; gap: 0; border: 1px solid var(--border-base); border-radius: 6px; overflow: hidden; }
.radio-group .radio-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0 16px;
  height: 32px;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  background: #fff;
  border: none;
  border-right: 1px solid var(--border-base);
  transition: all 0.2s;
  font-family: inherit;
}
.radio-group .radio-btn:last-child { border-right: none; }
.radio-group .radio-btn:hover { color: var(--primary); }
.radio-group .radio-btn.active { background: var(--primary); color: #fff; }
.radio-group input { position: absolute; opacity: 0; pointer-events: none; }

.checkbox { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; font-size: 14px; color: var(--text-primary); user-select: none; }
.checkbox input { width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer; }

/* 滑块 */
.range-wrap { display: flex; align-items: center; gap: 16px; }
.range-wrap input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: var(--primary-light);
  outline: none;
}
.range-wrap input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
  cursor: pointer;
}
.range-wrap input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%; background: #fff; border: 2px solid var(--primary); cursor: pointer;
}
.range-value { font-size: 14px; color: var(--primary); font-weight: 600; min-width: 64px; text-align: right; }

/* 标签 */
.tag { display: inline-block; padding: 0 8px; height: 22px; line-height: 20px; font-size: 12px; border-radius: 4px; border: 1px solid; }
.tag-blue { background: #e7f1ff; border-color: #a1c2ff; color: #0958d9; }
.tag-green { background: #f6ffed; border-color: #b7eb8f; color: #389e0d; }
.tag-orange { background: #fff7e6; border-color: #ffd591; color: #d46b08; }
.tag-red { background: #fff1f0; border-color: #ffa39e; color: #cf1322; }

/* 选项卡 Tabs */
.tabs { margin-bottom: 4px; }
.tabs .tab-nav { display: flex; gap: 4px; border-bottom: 1px solid var(--border-soft); margin-bottom: 20px; }
.tabs .tab-nav .tab-btn {
  position: relative;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.2s;
}
.tabs .tab-nav .tab-btn:hover { color: var(--primary-hover); }
.tabs .tab-nav .tab-btn.active { color: var(--primary); font-weight: 500; }
.tabs .tab-nav .tab-btn.active::after {
  content: "";
  position: absolute;
  left: 8px; right: 8px; bottom: -1px;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}
.tab-pane { display: none; }
.tab-pane.active { display: block; animation: fade 0.2s ease; }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

/* 上传区 */
.upload-area {
  border: 1px dashed var(--border-base);
  border-radius: 8px;
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: #fafbff;
}
.upload-area:hover, .upload-area.dragover { border-color: var(--primary); background: var(--primary-lighter); }
.upload-area .upload-icon { color: var(--text-tertiary); margin-bottom: 8px; display: inline-block; }
.upload-area .upload-icon svg { width: 40px; height: 40px; }
.upload-area .upload-text { color: var(--text-secondary); font-size: 14px; }
.upload-area .upload-text em { color: var(--primary); font-style: normal; }
.upload-area .upload-hint { color: var(--text-tertiary); font-size: 12px; margin-top: 6px; }

/* 提示消息 (toast) */
.toast-wrap {
  position: fixed;
  top: 76px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.toast {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  color: #fff;
  box-shadow: var(--shadow-md);
  animation: toastIn 0.25s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  pointer-events: auto;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--error); }
.toast.warning { background: var(--warning); }
.toast.info { background: var(--primary); }
@keyframes toastIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

/* 结果区 / 占位 */
.result-box {
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  padding: 14px 16px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  word-break: break-all;
  white-space: pre-wrap;
  min-height: 44px;
  line-height: 1.7;
}
.placeholder-box {
  text-align: center;
  color: var(--text-tertiary);
  padding: 40px 20px;
  font-size: 13px;
}
.placeholder-box .ph-icon { display: inline-block; margin-bottom: 8px; color: var(--text-disabled); }
.placeholder-box .ph-icon svg { width: 36px; height: 36px; }

.area-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.area-header h3 { font-size: 15px; font-weight: 600; }
.header-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.section-split { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

/* ============================================================
   首页 Hero
   ============================================================ */
.hero {
  background: linear-gradient(135deg, #1677ff 0%, #275eff 50%, #2f54eb 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 44px 40px;
  box-shadow: 0 6px 16px 0 rgba(22, 119, 255, 0.18), 0 3px 6px -4px rgba(0, 0, 0, 0.12);
  margin-bottom: 28px;
}
.hero h1 { font-size: 32px; font-weight: 700; letter-spacing: 0.5px; margin-bottom: 10px; color: #fff; }
.hero p { font-size: 16px; opacity: 0.92; margin: 0; max-width: 640px; }
.hero .hero-meta { margin-top: 16px; font-size: 13px; opacity: 0.85; }

/* 工具卡片网格 */
.tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.tool-card {
  background: #fff;
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 24px;
  cursor: pointer;
  transition: all 0.25s;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}
.tool-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.tool-card .tc-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--brand-deep));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.tool-card .tc-icon svg { width: 24px; height: 24px; }
.tool-card h3 { font-size: 17px; font-weight: 600; }
.tool-card .tc-desc { color: var(--text-tertiary); font-size: 13px; line-height: 1.7; }
.tool-card .tc-desc p { margin: 2px 0; }
.tool-card .tc-more { color: var(--primary); font-size: 13px; margin-top: auto; }

/* ============================================================
   二维码工具
   ============================================================ */
.qr-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--bg-soft);
  border-radius: 8px;
  min-height: 280px;
  justify-content: center;
}
.qr-preview img { width: 240px; height: 240px; image-rendering: pixelated; background: #fff; padding: 8px; border-radius: 8px; border: 1px solid var(--border-soft); }
.qr-preview .ph-icon svg { width: 48px; height: 48px; }

/* ============================================================
   图片转换
   ============================================================ */
.format-bar { display: flex; flex-wrap: wrap; gap: 20px; align-items: center; margin-bottom: 20px; }
.format-bar .format-item { display: flex; align-items: center; gap: 8px; }
.format-bar .format-label { font-size: 13px; color: var(--text-secondary); font-weight: 500; }
.format-bar .select { min-width: 140px; }
.image-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
.image-card { background: #fff; border: 1px solid var(--border-light); border-radius: 8px; overflow: hidden; box-shadow: var(--shadow-sm); }
.image-card .img-wrap { height: 140px; background: var(--bg-soft); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.image-card .img-wrap img { max-width: 100%; max-height: 100%; object-fit: contain; }
.image-card .img-body { padding: 10px 12px; }
.image-card .img-body h4 { font-size: 13px; margin: 0 0 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.image-card .img-body .img-size { font-size: 12px; color: var(--text-tertiary); margin: 0 0 8px; }

/* ============================================================
   密码生成器
   ============================================================ */
.pwd-display {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 20px;
}
.pwd-display .pwd-text { flex: 1; font-family: "SFMono-Regular", Consolas, Menlo, monospace; font-size: 18px; word-break: break-all; color: var(--text-primary); letter-spacing: 1px; }
.pwd-display .pwd-text.empty { color: var(--text-tertiary); font-size: 14px; }
.pwd-options { display: flex; flex-direction: column; gap: 18px; }
.char-options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.strength-area { margin-top: 20px; }
.strength-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; font-size: 13px; }
.strength-label { color: var(--text-secondary); }
.strength-value { font-weight: 600; }
.strength-bar { height: 8px; background: var(--bg-muted); border-radius: 4px; overflow: hidden; }
.strength-indicator { height: 100%; border-radius: 4px; transition: width 0.3s, background 0.3s; width: 0; }
.strength-very-weak { background: #ff4d4f; }
.strength-weak { background: #fa8c16; }
.strength-medium { background: #faad14; }
.strength-strong { background: #52c41a; }
.strength-very-strong { background: #13c2c2; }
.sv-very-weak { color: #ff4d4f; }
.sv-weak { color: #fa8c16; }
.sv-medium { color: #d48806; }
.sv-strong { color: #389e0d; }
.sv-very-strong { color: #08979c; }

/* ============================================================
   JSON 工具
   ============================================================ */
.json-viewer { background: var(--bg-soft); border: 1px solid var(--border-soft); border-radius: 8px; padding: 14px 16px; min-height: 200px; overflow: auto; }
.json-viewer pre { margin: 0; font-family: "SFMono-Regular", Consolas, Menlo, monospace; font-size: 13px; line-height: 1.7; white-space: pre-wrap; word-break: break-all; }
.json-key { color: #c41d7f; }
.json-string { color: #389e0d; }
.json-number { color: #0958d9; }
.json-boolean { color: #d46b08; }
.json-null { color: var(--text-tertiary); }

/* ============================================================
   页脚
   ============================================================ */
.app-footer {
  text-align: center;
  color: var(--text-tertiary);
  font-size: 12px;
  padding: 24px 0 8px;
}
.app-footer .footer-line { margin-bottom: 6px; }
.app-footer .footer-copyright { font-size: 12px; }
.app-footer .footer-copyright a { color: var(--text-tertiary); text-decoration: none; transition: color 0.2s; }
.app-footer .footer-copyright a:hover { color: var(--primary); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
  .section-split { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .app-header .brand { width: auto; }
  .menu-toggle { display: inline-flex; }
  .app-sidebar {
    position: fixed;
    top: var(--header-h);
    left: 0;
    bottom: 0;
    z-index: 95;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 2px 0 8px rgba(0,0,0,0.1);
  }
  .app-sidebar.open { transform: translateX(0); }
  .sidebar-mask.show { display: block; }
  .app-main { padding: 16px 16px 48px; }
  .tool-grid { grid-template-columns: 1fr; }
  .hero { padding: 32px 24px; }
  .hero h1 { font-size: 26px; }
  .char-options { grid-template-columns: 1fr; }
  .card { padding: 18px; }
  .radio-group .radio-btn { padding: 0 12px; }
}
@media (max-width: 480px) {
  .format-bar { flex-direction: column; align-items: stretch; }
  .format-bar .select { min-width: 0; }
}