/* ====== 基础变量 ====== */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  /* 亮色主题 */
  --bg: #f5f7fa;
  --bg-soft: #eef2f7;
  --card: #ffffff;
  --card-hover: #fafbff;
  --text: #1f2937;
  --text-light: #6b7280;
  --text-lighter: #9ca3af;
  --border: #e5e7eb;
  --primary: #4f46e5;
  --primary-light: #eef2ff;
  --primary-dark: #4338ca;
  --primary-gradient: linear-gradient(135deg, #4f46e5, #7c3aed);
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-hover: 0 12px 28px rgba(79,70,229,.15), 0 2px 6px rgba(0,0,0,.06);
  --radius: 14px;
  --radius-sm: 8px;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
}
[data-theme="dark"] {
  --bg: #0f172a;
  --bg-soft: #1e293b;
  --card: #1e293b;
  --card-hover: #273549;
  --text: #e2e8f0;
  --text-light: #94a3b8;
  --text-lighter: #64748b;
  --border: #334155;
  --primary: #818cf8;
  --primary-light: rgba(129,140,248,.12);
  --primary-dark: #6366f1;
  --primary-gradient: linear-gradient(135deg, #818cf8, #c084fc);
  --shadow: 0 1px 3px rgba(0,0,0,.3);
  --shadow-hover: 0 12px 28px rgba(129,140,248,.2);
  --code-bg: #020617;
  --code-text: #e2e8f0;
}

html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: background .3s, color .3s;
}
.container { width: 100%; max-width: 1240px; margin: 0 auto; padding: 0 24px; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* ====== 顶栏 ====== */
.topbar {
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--border);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  transition: background .3s, border-color .3s, box-shadow .3s;
}
[data-theme="dark"] .topbar { background: rgba(30,41,59,.9); }
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: 100%;
  padding: 0 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -.3px;
}
.logo-icon {
  font-size: 26px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
  border-radius: 6px;
}
.topnav {
  display: flex;
  gap: 4px;
  align-items: center;
  overflow-x: auto;
  flex: 1;
  margin: 0 16px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.topnav::-webkit-scrollbar { display: none; }
.topnav a {
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 14px;
  color: var(--text-light);
  transition: all .2s;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}
.topnav a:hover {
  background: var(--primary-light);
  color: var(--primary);
}
.theme-toggle, .sidebar-toggle {
  background: none;
  border: 1px solid var(--border);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .2s;
  color: var(--text);
}
.theme-toggle:hover, .sidebar-toggle:hover { border-color: var(--primary); color: var(--primary); }
.topbar-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.theme-toggle .theme-icon-dark { display: none; }
[data-theme="dark"] .theme-toggle .theme-icon-light { display: none; }
[data-theme="dark"] .theme-toggle .theme-icon-dark { display: inline; }
.sidebar-toggle { display: none; }

/* ====== 布局：侧边栏 + 主内容 ====== */
.layout-wrapper {
  display: flex;
  min-height: 100vh;
  padding-top: 64px;
}
.sidebar {
  position: fixed;
  top: 64px;
  left: 0;
  bottom: 0;
  width: 220px;
  background: var(--bg-soft);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform .3s ease;
}
.sidebar-header {
  padding: 16px 20px 10px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-lighter);
  text-transform: uppercase;
  letter-spacing: 1px;
  flex-shrink: 0;
}
.sidenav {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 10px;
  padding-bottom: 16px;
}
.sidenav a {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-light);
  transition: all .2s;
  font-weight: 500;
}
.sidenav a:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-group { margin-bottom: 4px; }
.nav-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  transition: all .2s;
  user-select: none;
}
.nav-group-header:hover { background: var(--primary-light); }
.nav-group-header .group-icon { margin-right: 8px; }
.nav-group-header .group-arrow {
  font-size: 10px;
  transition: transform .2s;
  color: var(--text-lighter);
}
.nav-group.collapsed .group-arrow { transform: rotate(-90deg); }
.nav-group-items {
  overflow: hidden;
  max-height: 500px;
  transition: max-height .3s ease;
}
.nav-group.collapsed .nav-group-items {
  max-height: 0;
}
.nav-group-items a {
  display: block;
  padding: 8px 14px 8px 36px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-light);
  transition: all .2s;
  font-weight: 500;
  margin: 1px 0;
}
.nav-group-items a:hover {
  background: var(--primary-light);
  color: var(--primary);
}
.nav-group-items a.active {
  background: var(--primary);
  color: #fff;
}
.nav-group-items a .tool-count {
  float: right;
  font-size: 11px;
  color: var(--text-lighter);
  background: var(--bg-secondary);
  padding: 1px 6px;
  border-radius: 10px;
}
.nav-group-items a.active .tool-count { color: rgba(255,255,255,.8); }

.sidebar-footer {
  flex-shrink: 0;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
}
[data-theme="dark"] .sidebar { background: rgba(15,23,42,.6); }
.sidebar-footer .fav-entry {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  transition: all .2s;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.sidebar-footer .fav-entry:hover {
  background: var(--primary-light);
  color: var(--primary);
}
.sidebar-footer .fav-entry .fav-count {
  margin-left: auto;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
}

.fav-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-light);
  cursor: pointer;
  font-size: 13px;
  transition: all .2s;
  margin-left: auto;
}
.fav-btn:hover { border-color: var(--primary); color: var(--primary); }
.fav-btn.active {
  background: #fff0f0;
  border-color: #ff4d4f;
  color: #ff4d4f;
}
.fav-btn .heart { transition: transform .2s; }
.fav-btn.active .heart { animation: heartBeat .3s ease; }
@keyframes heartBeat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.3); }
}
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 99;
}
.sidebar-overlay.show { display: block; }

.right-area {
  flex: 1;
  min-width: 0;
  margin-left: 220px;
  display: flex;
  flex-direction: column;
}
.main-content {
  flex: 1;
  padding: 0 24px;
  max-width: 1020px;
}

/* ====== Hero ====== */
.hero {
  text-align: center;
  padding: 64px 20px 48px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse at center, rgba(124,58,237,.12), transparent 60%);
  pointer-events: none;
}
.hero h1 {
  font-size: 38px;
  font-weight: 800;
  letter-spacing: -.8px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 14px;
  position: relative;
}
.hero p {
  color: var(--text-light);
  font-size: 16px;
  position: relative;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 56px;
  margin-top: 32px;
  flex-wrap: wrap;
  position: relative;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 32px;
  font-weight: 800;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}
.hero-stat .label {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 8px;
  font-weight: 500;
}

/* ====== 搜索 ====== */
.search-wrap {
  max-width: 600px;
  margin: 28px auto 0;
  position: relative;
  z-index: 1;
}
.search-wrap input {
  width: 100%;
  height: 52px;
  padding: 0 52px 0 20px;
  border: 1px solid var(--border);
  border-radius: 26px;
  font-size: 15px;
  background: var(--card);
  box-shadow: var(--shadow);
  transition: all .2s;
  outline: none;
  color: var(--text);
}
.search-wrap input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79,70,229,.12), var(--shadow);
}
.search-wrap input::placeholder { color: var(--text-lighter); }
.search-wrap::before {
  content: "🔍";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 16px;
  opacity: .5;
  pointer-events: none;
}

/* ====== 分类区块 ====== */
.category-section { margin: 48px 0; scroll-margin-top: 88px; }
.category-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
  padding-left: 14px;
  border-left: 4px solid;
  border-image: var(--primary-gradient) 1;
}
.category-title .count {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--primary);
  background: var(--primary-light);
  padding: 3px 12px;
  border-radius: 12px;
}

/* ====== 工具卡片网格 ====== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: all .25s cubic-bezier(.4,0,.2,1);
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  overflow: hidden;
}
.tool-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity .25s;
  z-index: 0;
}
.tool-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.tool-card > * { position: relative; z-index: 1; }
.tool-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary-light), rgba(252,231,243,.5));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  transition: transform .25s;
}
[data-theme="dark"] .tool-icon {
  background: linear-gradient(135deg, rgba(129,140,248,.15), rgba(192,132,252,.1));
}
.tool-card:hover .tool-icon { transform: scale(1.1) rotate(-5deg); }
.tool-name {
  font-weight: 600;
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.tool-desc {
  font-size: 12.5px;
  color: var(--text-light);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 异步标签 */
.async-tag {
  display: inline-block;
  font-size: 10px;
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  color: #92400e;
  padding: 2px 7px;
  border-radius: 5px;
  font-weight: 600;
  vertical-align: middle;
}
[data-theme="dark"] .async-tag {
  background: rgba(251,191,36,.15);
  color: #fcd34d;
}

/* ====== 工具操作页 ====== */
.tool-view { padding: 28px 0 80px; }
.tool-view-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  cursor: pointer;
  transition: all .2s;
  color: var(--text);
}
.back-btn:hover { border-color: var(--primary); color: var(--primary); transform: translateX(-2px); }
.tool-view-title { display: flex; align-items: center; gap: 14px; }
.tool-view-title .tool-icon { width: 44px; height: 44px; font-size: 22px; }
.tool-view-title h2 {
  font-size: 24px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.cat-tag {
  font-size: 12px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 3px 12px;
  border-radius: 12px;
  font-weight: 500;
}

.fav-category { margin-bottom: 32px; }
.fav-category h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.fav-category h3::before {
  content: '📁';
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text);
  cursor: pointer;
  transition: all .2s;
}
.btn-sm:hover { border-color: var(--error); color: var(--error); }
.tool-view-desc {
  color: var(--text-light);
  margin-bottom: 20px;
  font-size: 14.5px;
}
.notice-bar {
  background: var(--primary-light);
  color: var(--primary);
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 24px;
  border-left: 3px solid var(--primary);
}

/* ====== 表单 ====== */
.tool-form {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
.field { margin-bottom: 20px; }
.field:last-of-type { margin-bottom: 0; }
.field-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}
.field-label .req { color: #ef4444; margin-left: 2px; }
.field input[type="text"],
.field input[type="number"],
.field input[type="password"],
.field select,
.field textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  background: var(--card);
  transition: all .2s;
  outline: none;
  color: var(--text);
}
.field textarea {
  min-height: 150px;
  resize: vertical;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,.12);
}
[data-theme="dark"] .field input:focus,
[data-theme="dark"] .field select:focus,
[data-theme="dark"] .field textarea:focus {
  box-shadow: 0 0 0 3px rgba(129,140,248,.2);
}
.field-check {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  padding: 8px 0;
}
.field-check input { width: 18px; height: 18px; cursor: pointer; accent-color: var(--primary); }
.field-check label { font-size: 14px; cursor: pointer; }

.btn-run {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  background: var(--primary-gradient);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  margin-top: 12px;
  position: relative;
  overflow: hidden;
}
.btn-run::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,.2);
  transform: translateX(-100%);
  transition: transform .3s;
}
.btn-run:hover:not(:disabled)::before { transform: translateX(0); }
.btn-run:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(79,70,229,.3); }
.btn-run:disabled { opacity: .6; cursor: not-allowed; }

/* 文件上传 */
.file-upload { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.file-upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: var(--primary-light);
  color: var(--primary);
  border: 1px dashed var(--primary);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
}
.file-upload-btn:hover { background: var(--primary); color: #fff; border-style: solid; }
.file-name { font-size: 13px; color: var(--text-light); }
.file-preview { margin-top: 12px; }

/* 进度条 */
.progress-bar {
  width: 100%;
  height: 12px;
  background: var(--bg-soft);
  border-radius: 6px;
  overflow: hidden;
  margin-top: 14px;
}
.progress-bar-large {
  height: 20px;
  border-radius: 10px;
  margin-top: 12px;
}
.progress-fill {
  height: 100%;
  background: var(--primary-gradient);
  border-radius: 6px;
  transition: width .3s ease;
  position: relative;
  overflow: hidden;
}
.progress-bar-large .progress-fill {
  border-radius: 10px;
}
.progress-fill::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.4), transparent);
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer { 100% { transform: translateX(100%); } }

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}
.progress-title {
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
}
.progress-percent {
  font-weight: 700;
  font-size: 18px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.progress-info {
  display: flex;
  gap: 20px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.progress-info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.progress-info-label {
  font-size: 12px;
  color: var(--text-lighter);
}
.progress-info-value {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  font-family: 'SF Mono', Monaco, Consolas, monospace;
}
.task-id {
  font-size: 12px;
  color: var(--text-light);
}

/* 下载按钮 */
.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  background: linear-gradient(135deg, #ecfdf5, #d1fae5);
  color: #059669;
  border: 1px solid #10b981;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: all .2s;
}
[data-theme="dark"] .download-btn {
  background: rgba(16,185,129,.15);
  color: #34d399;
  border-color: rgba(16,185,129,.4);
}
.download-btn:hover { background: #10b981; color: #fff; transform: translateY(-1px); }

/* 图片网格 */
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px;
}
.image-item {
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  padding: 10px;
  text-align: center;
  transition: transform .2s;
}
.image-item:hover { transform: scale(1.02); }
.image-item img {
  max-width: 100%;
  max-height: 200px;
  border-radius: 6px;
  display: block;
  margin: 0 auto;
}
.download-link {
  display: inline-block;
  margin-top: 10px;
  font-size: 12px;
  color: var(--primary);
  text-decoration: none;
}
.download-link:hover { text-decoration: underline; }

/* ====== 结果区 ====== */
.result-area { margin-top: 28px; }
.result-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  animation: slideUp .3s ease;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.result-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.result-output {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 18px;
  border-radius: var(--radius-sm);
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 13.5px;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 440px;
  overflow: auto;
  line-height: 1.6;
}
.result-stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 12px;
  margin-bottom: 14px;
}
.stat-item {
  background: linear-gradient(135deg, var(--primary-light), rgba(252,231,243,.3));
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  transition: transform .2s;
}
[data-theme="dark"] .stat-item {
  background: linear-gradient(135deg, rgba(129,140,248,.1), rgba(192,132,252,.05));
}
.stat-item:hover { transform: translateY(-2px); }
.stat-item .stat-label { font-size: 12px; color: var(--text-light); }
.stat-item .stat-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  margin-top: 6px;
  word-break: break-all;
  font-family: "SFMono-Regular", Consolas, monospace;
}
.copy-btn {
  margin-left: auto;
  padding: 5px 14px;
  font-size: 12px;
  background: var(--primary-light);
  color: var(--primary);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all .2s;
  font-weight: 500;
}
.copy-btn:hover { background: var(--primary); color: #fff; }
.error-msg {
  background: linear-gradient(135deg, #fef2f2, #fee2e2);
  border: 1px solid #fecaca;
  color: #dc2626;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}
[data-theme="dark"] .error-msg {
  background: rgba(239,68,68,.1);
  border-color: rgba(239,68,68,.3);
  color: #fca5a5;
}
.loading { text-align: center; padding: 70px 0; color: var(--text-light); }
.empty { text-align: center; padding: 48px; color: var(--text-light); }

/* ====== 页脚 ====== */
.footer {
  margin-top: auto;
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  background: var(--card);
  text-align: center;
  color: var(--text-light);
  font-size: 13px;
  max-width: 1020px;
}
.footer-inner { max-width: 1020px; margin: 0 auto; }
.footer-sub { font-size: 12px; margin-top: 6px; opacity: .7; }

/* ====== 响应式 ====== */
@media (max-width: 768px) {
  .hero h1 { font-size: 28px; }
  .hero-stats { gap: 32px; }
  .hero-stat .num { font-size: 26px; }
  .topnav a { padding: 6px 10px; font-size: 13px; }
  .tools-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
  .tool-card { padding: 16px; }
  .tool-icon { width: 40px; height: 40px; font-size: 20px; }
  .container { padding: 0 16px; }
  .tool-form { padding: 20px; }
  .tool-view-title h2 { font-size: 20px; }
  /* 移动端：侧边栏改为抽屉式 */
  .sidebar-toggle { display: flex; }
  .sidebar {
    transform: translateX(-100%);
    box-shadow: 2px 0 20px rgba(0,0,0,.15);
  }
  .sidebar.open { transform: translateX(0); }
  .right-area { margin-left: 0; }
  .main-content { padding: 0 16px; }
  .footer { padding: 24px 16px; }
  .topnav { margin: 0 8px; }
}

/* 滚动条美化 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-soft); }
::-webkit-scrollbar-thumb {
  background: var(--text-lighter);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-light); }