/**
 * 1bug 工具箱 — Apple HIG 设计系统
 * - SF 字体栈 / 系统色 / 8pt 网格 / 44pt 触控目标
 * - 浅色 + 深色双主题（prefers-color-scheme + 手动切换）
 */

:root {
  --font-system: -apple-system, BlinkMacSystemFont, 'SF Pro Display',
                 'SF Pro Text', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --system-blue: #007AFF;
  --system-green: #34C759;
  --system-indigo: #5856D6;
  --system-orange: #FF9500;
  --system-pink: #FF2D55;
  --system-purple: #AF52DE;
  --system-red: #FF3B30;
  --system-teal: #5AC8FA;
  --system-yellow: #FFCC00;
  --system-gray: #8E8E93;
  --system-gray5: #E5E5EA;
  --system-gray6: #F2F2F7;

  --label-primary: #000000;
  --label-secondary: rgba(60, 60, 67, 0.6);
  --label-tertiary: rgba(60, 60, 67, 0.3);

  --bg-primary: #FFFFFF;
  --bg-secondary: #F2F2F7;
  --bg-tertiary: #FFFFFF;
  --fill-quaternary: rgba(118, 118, 128, 0.12);
  --separator: rgba(60, 60, 67, 0.12);

  --tint-blue: rgba(0, 122, 255, 0.1);

  --space-1: 4px;  --space-2: 8px;  --space-3: 12px;
  --space-4: 16px; --space-5: 20px; --space-6: 24px;
  --space-8: 32px; --space-10: 40px; --space-12: 48px;

  --radius-sm: 8px; --radius-md: 12px; --radius-lg: 16px;
  --radius-xl: 20px; --radius-full: 9999px;

  --ease-default: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --duration-fast: 200ms;
  --duration-normal: 300ms;

  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.04), 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 2px 4px rgba(0, 0, 0, 0.06), 0 12px 32px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  --system-blue: #0A84FF;
  --system-green: #30D158;
  --system-indigo: #5E5CE6;
  --system-orange: #FF9F0A;
  --system-pink: #FF375F;
  --system-purple: #BF5AF2;
  --system-red: #FF453A;
  --system-teal: #64D2FF;
  --system-yellow: #FFD60A;
  --system-gray5: #2C2C2E;
  --system-gray6: #1C1C1E;

  --label-primary: #FFFFFF;
  --label-secondary: rgba(235, 235, 245, 0.6);
  --label-tertiary: rgba(235, 235, 245, 0.3);

  --bg-primary: #000000;
  --bg-secondary: #1C1C1E;
  --bg-tertiary: #2C2C2E;
  --fill-quaternary: rgba(120, 120, 128, 0.24);
  --separator: rgba(84, 84, 88, 0.4);

  --tint-blue: rgba(10, 132, 255, 0.18);

  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-card-hover: 0 2px 4px rgba(0, 0, 0, 0.35), 0 12px 32px rgba(0, 0, 0, 0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --system-blue: #0A84FF;
    --system-green: #30D158;
    --system-indigo: #5E5CE6;
    --system-orange: #FF9F0A;
    --system-pink: #FF375F;
    --system-purple: #BF5AF2;
    --system-red: #FF453A;
    --system-teal: #64D2FF;
    --system-yellow: #FFD60A;
    --system-gray5: #2C2C2E;
    --system-gray6: #1C1C1E;
    --label-primary: #FFFFFF;
    --label-secondary: rgba(235, 235, 245, 0.6);
    --label-tertiary: rgba(235, 235, 245, 0.3);
    --bg-primary: #000000;
    --bg-secondary: #1C1C1E;
    --bg-tertiary: #2C2C2E;
    --fill-quaternary: rgba(120, 120, 128, 0.24);
    --separator: rgba(84, 84, 88, 0.4);
    --tint-blue: rgba(10, 132, 255, 0.18);
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow-card-hover: 0 2px 4px rgba(0, 0, 0, 0.35), 0 12px 32px rgba(0, 0, 0, 0.45);
  }
}

/* ---------- Base ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-system);
  font-size: 17px;
  line-height: 1.5;
  color: var(--label-primary);
  background: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; font-size: inherit; color: inherit; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--separator);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--label-primary);
  min-height: 44px;
}

.nav-logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--system-blue);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.nav-logo svg { width: 16px; height: 16px; }
.nav-title { font-size: 17px; font-weight: 600; }

.icon-btn {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background var(--duration-fast) var(--ease-default),
              transform var(--duration-fast) var(--ease-default);
}
.icon-btn:hover { background: var(--fill-quaternary); }
.icon-btn:active { transform: scale(0.92); }
.icon-btn span { display: inline-flex; color: var(--label-primary); }

/* 工具详情页标题图标 */
.title-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  color: #fff;
  margin-right: var(--space-3);
  vertical-align: -10px;
}

/* ---------- Layout ---------- */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-4) var(--space-12);
}

.footer {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  color: var(--label-tertiary);
  font-size: 13px;
}

.beian { margin-top: var(--space-2); }

.beian a {
  color: var(--label-tertiary);
  text-decoration: none;
  margin: 0 var(--space-2);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 24px;
  transition: color var(--duration-fast) var(--ease-default);
}
.beian a:hover { color: var(--label-secondary); }
.beian img { display: block; }

/* ---------- Home: Hero ---------- */
.hero { text-align: center; margin-bottom: var(--space-10); animation: rise var(--duration-normal) var(--ease-default) both; }

.hero h1 {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: var(--space-2);
}

.hero p { color: var(--label-secondary); font-size: 15px; }

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Search ---------- */
.search-wrap { max-width: 560px; margin: 0 auto var(--space-8); }

.search-input {
  width: 100%;
  min-height: 44px;
  padding: 0 var(--space-4) 0 40px;
  border: none;
  border-radius: var(--radius-full);
  background: var(--fill-quaternary);
  font-size: 17px;
  outline: none;
  transition: box-shadow var(--duration-fast) var(--ease-default);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%238E8E93' viewBox='0 0 16 16'%3E%3Cpath d='M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001c.03.04.062.078.098.115l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85a1.007 1.007 0 0 0-.115-.1zM12 6.5a5.5 5.5 0 1 1-11 0 5.5 5.5 0 0 1 11 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 14px center;
}
.search-input:focus { box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.3); }
.search-input::placeholder { color: var(--label-tertiary); }

/* ---------- Category section ---------- */
.category { margin-bottom: var(--space-8); }

.category-title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.2px;
  margin-bottom: var(--space-3);
  padding-left: var(--space-1);
}

/* ---------- Tool cards grid ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-4);
}

.tool-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--bg-tertiary);
  border-radius: 18px;
  border: 1px solid var(--separator);
  box-shadow: var(--shadow-card);
  text-decoration: none;
  color: var(--label-primary);
  animation: cardIn 420ms var(--ease-default) both;
  transition: transform var(--duration-fast) var(--ease-default),
              box-shadow var(--duration-fast) var(--ease-default);
}
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card-hover); }
.tool-card:active { transform: scale(0.98); }

.tool-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: inset 0 -2px 4px rgba(0, 0, 0, 0.1), 0 2px 6px rgba(0, 0, 0, 0.12);
}

.link-arrow {
  flex-shrink: 0;
  align-self: center;
  margin-left: auto;
  color: var(--label-tertiary);
  display: inline-flex;
  transition: color var(--duration-fast) var(--ease-default),
              transform var(--duration-fast) var(--ease-default);
}
.tool-card:hover .link-arrow { color: var(--system-blue); transform: translate(1px, -1px); }

.tool-meta { min-width: 0; }
.tool-name { font-size: 17px; font-weight: 600; margin-bottom: 2px; }
.tool-desc {
  font-size: 13px;
  color: var(--label-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- Tool detail page ---------- */
.page-header { margin-bottom: var(--space-6); }

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 0 var(--space-3) 0 var(--space-2);
  margin-bottom: var(--space-3);
  margin-left: calc(-1 * var(--space-2));
  border: none;
  background: transparent;
  color: var(--system-blue);
  font-size: 17px;
  border-radius: var(--radius-sm);
  transition: background var(--duration-fast) var(--ease-default);
}
.back-btn:hover { background: var(--tint-blue); }

.page-title { font-size: 28px; font-weight: 700; letter-spacing: -0.4px; }
.page-desc { color: var(--label-secondary); font-size: 15px; margin-top: var(--space-1); }

/* ---------- Panels & form controls ---------- */
.panel {
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
}

.panel-title {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--label-secondary);
  margin-bottom: var(--space-3);
}

.field { margin-bottom: var(--space-4); }
.field:last-child { margin-bottom: 0; }

.field-label {
  display: block;
  font-size: 15px;
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.text-input, .select-input {
  width: 100%;
  min-height: 44px;
  padding: 0 var(--space-3);
  border: none;
  border-radius: var(--radius-md);
  background: var(--fill-quaternary);
  outline: none;
  transition: box-shadow var(--duration-fast) var(--ease-default);
}
.text-input:focus, .select-input:focus, .text-area:focus {
  box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.3);
}

.text-area {
  width: 100%;
  min-height: 120px;
  padding: var(--space-3);
  border: none;
  border-radius: var(--radius-md);
  background: var(--fill-quaternary);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  resize: vertical;
  outline: none;
  transition: box-shadow var(--duration-fast) var(--ease-default);
}

.output-box {
  width: 100%;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--fill-quaternary);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 44px;
  max-height: 420px;
  overflow: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0 var(--space-5);
  border: none;
  border-radius: var(--radius-full);
  font-size: 17px;
  font-weight: 600;
  transition: transform var(--duration-fast) var(--ease-default),
              opacity var(--duration-fast) var(--ease-default);
}
.btn:active { transform: scale(0.97); }

.btn-primary { background: var(--system-blue); color: #fff; }
.btn-secondary { background: var(--tint-blue); color: var(--system-blue); }
.btn-plain { background: var(--fill-quaternary); color: var(--label-primary); font-weight: 500; }

.btn-sm {
  min-height: 32px;
  padding: 0 var(--space-3);
  font-size: 13px;
  font-weight: 500;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

/* ---------- Chips (segmented options) ---------- */
.chips { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.chip {
  min-height: 36px;
  padding: 0 var(--space-4);
  border: none;
  border-radius: var(--radius-full);
  background: var(--fill-quaternary);
  color: var(--label-primary);
  font-size: 15px;
  transition: background var(--duration-fast) var(--ease-default),
              color var(--duration-fast) var(--ease-default),
              transform var(--duration-fast) var(--ease-default);
}
.chip:active { transform: scale(0.96); }
.chip.active { background: var(--system-blue); color: #fff; font-weight: 600; }

/* ---------- Live result rows ---------- */
.result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--separator);
}
.result-row:last-child { border-bottom: none; }
.result-label { font-size: 15px; color: var(--label-secondary); flex-shrink: 0; }
.result-value {
  font-family: var(--font-mono);
  font-size: 15px;
  text-align: right;
  word-break: break-all;
}

/* ---------- Misc ---------- */
.error-text { color: var(--system-red); font-size: 13px; margin-top: var(--space-2); }
.hint-text { color: var(--label-tertiary); font-size: 13px; margin-top: var(--space-2); }

.swatch {
  width: 100%;
  height: 80px;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  border: 1px solid var(--separator);
}

.match-highlight { background: rgba(255, 204, 0, 0.45); border-radius: 3px; padding: 0 1px; }
[data-theme="dark"] .match-highlight { background: rgba(255, 214, 10, 0.4); color: #fff; }

.drop-zone {
  border: 2px dashed var(--separator);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  color: var(--label-secondary);
  transition: border-color var(--duration-fast) var(--ease-default),
              background var(--duration-fast) var(--ease-default);
  cursor: pointer;
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--system-blue);
  background: var(--tint-blue);
  color: var(--system-blue);
}

.img-preview {
  max-width: 100%;
  max-height: 280px;
  border-radius: var(--radius-md);
  display: block;
  margin: var(--space-3) auto 0;
}

.range-row { display: flex; align-items: center; gap: var(--space-3); }
.range-row input[type="range"] { flex: 1; accent-color: var(--system-blue); }
.range-val { font-family: var(--font-mono); font-size: 15px; min-width: 48px; text-align: right; }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-3);
}
.stat-item {
  background: var(--fill-quaternary);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  text-align: center;
}
.stat-num { font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat-cap { font-size: 12px; color: var(--label-secondary); }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 40px;
  transform: translateX(-50%) translateY(20px);
  background: var(--label-primary);
  color: var(--bg-primary);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-size: 15px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-default),
              transform var(--duration-normal) var(--ease-spring);
  z-index: 200;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .container { padding: var(--space-5) var(--space-4) var(--space-10); }
  .hero h1 { font-size: 32px; letter-spacing: -0.6px; }
  .tool-grid { grid-template-columns: 1fr; }
  .page-title { font-size: 24px; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}