/* ===========================================================
   Apple 产品分区对比 — Apple 官网风格
   =========================================================== */
:root {
  --arc-bg: #ffffff;
  --arc-bg-soft: #f5f5f7;
  --arc-text: #1d1d1f;
  --arc-text-soft: #6e6e73;
  --arc-line: #d2d2d7;
  --arc-blue: #0071e3;
  --arc-green: #34c759;
  --arc-red: #ff3b30;
  --arc-dep: #8e8e93;
  --arc-radius: 18px;
  --arc-radius-sm: 12px;
  --arc-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --arc-bg: #000000;
    --arc-bg-soft: #1c1c1e;
    --arc-text: #f5f5f7;
    --arc-text-soft: #a1a1a6;
    --arc-line: #38383c;
  }
}
body[data-theme="dark"] {
  --arc-bg: #000000;
  --arc-bg-soft: #1c1c1e;
  --arc-text: #f5f5f7;
  --arc-text-soft: #a1a1a6;
  --arc-line: #38383c;
}

.arc-page {
  font-family: var(--arc-font);
  color: var(--arc-text);
  background: var(--arc-bg);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

/* ---------- Hero ---------- */
.arc-hero {
  text-align: center;
  padding: 88px 20px 56px;
  background: linear-gradient(180deg, var(--arc-bg-soft) 0%, var(--arc-bg) 100%);
}
.arc-hero-inner { max-width: 820px; margin: 0 auto; }
.arc-hero-title {
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}
.arc-hero-sub {
  font-size: clamp(16px, 2.4vw, 21px);
  color: var(--arc-text-soft);
  margin: 0 auto 16px;
  max-width: 720px;
}
.arc-hero-note {
  font-size: 13px;
  color: var(--arc-text-soft);
  opacity: 0.8;
  margin: 0;
}

/* ---------- Toolbar ---------- */
.arc-toolbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--arc-bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--arc-line);
}
.arc-toolbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
.arc-seg {
  display: inline-flex;
  background: var(--arc-bg-soft);
  border-radius: 980px;
  padding: 4px;
  gap: 2px;
  flex-wrap: wrap;
}
.arc-seg-btn {
  border: none;
  background: transparent;
  color: var(--arc-text);
  font-size: 14px;
  font-weight: 500;
  padding: 7px 16px;
  border-radius: 980px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  font-family: inherit;
}
.arc-seg-btn:hover { color: var(--arc-blue); }
.arc-seg-btn.active {
  background: var(--arc-bg);
  color: var(--arc-text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}
body[data-theme="dark"] .arc-seg-btn.active { background: #2c2c2e; }

.arc-search-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--arc-bg-soft);
  border: 1px solid transparent;
  border-radius: 980px;
  padding: 8px 16px;
  min-width: 220px;
  flex: 1;
  max-width: 340px;
}
.arc-search-wrap i { color: var(--arc-text-soft); font-size: 13px; }
.arc-search-wrap input {
  border: none;
  background: transparent;
  outline: none;
  color: var(--arc-text);
  font-size: 14px;
  width: 100%;
  font-family: inherit;
}
.arc-search-wrap:focus-within { border-color: var(--arc-blue); }

/* ---------- Sections ---------- */
.arc-main { max-width: 1100px; margin: 0 auto; padding: 56px 20px 80px; }
.arc-section { margin-bottom: 72px; }
.arc-h2 {
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.arc-h2 i { color: var(--arc-blue); font-size: 0.85em; }
.arc-p {
  color: var(--arc-text-soft);
  font-size: 16px;
  margin: 0 0 24px;
  max-width: 760px;
}

/* ---------- Matrix ---------- */
.arc-table-scroll {
  overflow-x: auto;
  border-radius: var(--arc-radius);
  border: 1px solid var(--arc-line);
  -webkit-overflow-scrolling: touch;
}
.arc-matrix {
  border-collapse: collapse;
  width: 100%;
  min-width: 760px;
  font-size: 14px;
}
.arc-matrix thead th {
  background: var(--arc-bg-soft);
  padding: 14px 10px;
  text-align: center;
  font-weight: 600;
  border-bottom: 1px solid var(--arc-line);
  white-space: nowrap;
}
.arc-matrix thead th .rg-flag { font-size: 18px; display: block; }
.arc-matrix thead th .rg-label { font-size: 12px; color: var(--arc-text-soft); }
.arc-matrix .sticky-col {
  position: sticky;
  left: 0;
  z-index: 2;
  background: var(--arc-bg);
  text-align: left;
  min-width: 200px;
}
.arc-matrix thead .sticky-col { background: var(--arc-bg-soft); }
.arc-matrix tbody tr:nth-child(even) td { background: color-mix(in srgb, var(--arc-bg-soft) 50%, var(--arc-bg)); }
.arc-matrix tbody tr:nth-child(even) .sticky-col { background: color-mix(in srgb, var(--arc-bg-soft) 50%, var(--arc-bg)); }
.dim-cell { padding: 12px 14px; }
.dim-name { display: block; font-weight: 600; }
.dim-note { display: block; font-size: 12px; color: var(--arc-text-soft); margin-top: 2px; }
.arc-matrix td.cell { text-align: center; padding: 12px 10px; }
.cell-yes i { color: var(--arc-green); }
.cell-no i { color: var(--arc-red); opacity: 0.7; }
.cell-dep i { color: var(--arc-dep); }

.arc-legend {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 16px;
  font-size: 13px;
  color: var(--arc-text-soft);
}
.arc-legend .lg { display: inline-flex; align-items: center; gap: 6px; }
.lg-yes i { color: var(--arc-green); }
.lg-no i { color: var(--arc-red); }
.lg-dep i { color: var(--arc-dep); }

/* ---------- Model selector & product matrix ---------- */
.arc-model-seg {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 2px 2px 14px;
  margin-bottom: 8px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}
.arc-model-btn {
  flex: 0 0 auto;
  max-width: 300px;
  border: 1px solid var(--arc-line);
  border-radius: 980px;
  background: var(--arc-bg);
  color: var(--arc-text);
  padding: 9px 16px;
  font: 500 13px/1.35 var(--arc-font);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.arc-model-btn:hover {
  color: var(--arc-blue);
  border-color: var(--arc-blue);
}
.arc-model-btn.active {
  color: #fff;
  border-color: var(--arc-blue);
  background: var(--arc-blue);
}
.arc-product-summary {
  color: var(--arc-text-soft);
  font-size: 14px;
  margin: 4px 0 20px;
  line-height: 1.65;
}
.arc-product-summary strong {
  color: var(--arc-text);
  font-size: 17px;
  margin-right: 12px;
}
.arc-product-date {
  display: inline-block;
  color: var(--arc-text-soft);
  font-size: 12px;
  margin-bottom: 5px;
}
.arc-product-matrix th:not(.sticky-col) {
  min-width: 130px;
}
.arc-group-region {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
}
.arc-region-separator {
  display: inline-block;
  color: var(--arc-text-soft);
  margin: 0 7px;
  vertical-align: middle;
}
.arc-text-cell {
  min-width: 150px;
  padding: 13px 14px;
  text-align: left;
  vertical-align: top;
  color: var(--arc-text);
  border-left: 1px solid color-mix(in srgb, var(--arc-line) 65%, transparent);
}
.arc-table-diffs {
  margin: 0;
  padding-left: 17px;
}
.arc-table-diffs li {
  margin: 0 0 5px;
  line-height: 1.45;
}
.arc-table-diffs li:last-child {
  margin-bottom: 0;
}

/* ---------- Legacy product cards ---------- */
.arc-products { display: flex; flex-direction: column; gap: 14px; }
.arc-card {
  border: 1px solid var(--arc-line);
  border-radius: var(--arc-radius);
  background: var(--arc-bg);
  overflow: hidden;
  transition: box-shadow 0.25s, border-color 0.25s;
}
.arc-card.open { box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08); border-color: color-mix(in srgb, var(--arc-blue) 40%, var(--arc-line)); }
.arc-card-head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 26px;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: var(--arc-text);
}
.arc-card-title { display: flex; flex-direction: column; gap: 4px; }
.arc-card-name { font-size: 19px; font-weight: 600; letter-spacing: -0.01em; }
.arc-card-date { font-size: 13px; color: var(--arc-text-soft); }
.arc-chevron { color: var(--arc-text-soft); transition: transform 0.3s; }
.arc-card.open .arc-chevron { transform: rotate(180deg); color: var(--arc-blue); }

.arc-card-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  padding: 0 26px;
}
.arc-card.open .arc-card-body { padding-bottom: 26px; }
.arc-card-summary {
  color: var(--arc-text-soft);
  font-size: 15px;
  margin: 0 0 20px;
  padding-top: 4px;
  border-top: 1px solid var(--arc-line);
  padding-top: 18px;
}
.arc-region-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}
.arc-region-block {
  background: var(--arc-bg-soft);
  border-radius: var(--arc-radius-sm);
  padding: 16px 18px;
}
.arc-region-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.arc-region-head .rg-flag { font-size: 18px; }
.arc-region-head .rg-name { font-weight: 600; font-size: 15px; }
.arc-region-head .rg-model {
  font-size: 11px;
  color: var(--arc-text-soft);
  background: var(--arc-bg);
  padding: 2px 8px;
  border-radius: 980px;
  margin-left: auto;
}
.arc-diff-list { margin: 0; padding-left: 18px; }
.arc-diff-list li { font-size: 13.5px; color: var(--arc-text); margin-bottom: 5px; }

.arc-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--arc-text-soft);
}
.arc-empty i { font-size: 40px; margin-bottom: 12px; opacity: 0.5; }

/* ---------- Features ---------- */
.arc-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.arc-feature {
  display: flex;
  gap: 16px;
  background: var(--arc-bg-soft);
  border-radius: var(--arc-radius);
  padding: 22px;
}
.arc-feature-icon {
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--arc-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--arc-blue);
  font-size: 20px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}
.arc-feature-title { font-size: 17px; font-weight: 600; margin: 0 0 6px; }
.arc-feature-by {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--arc-blue);
  background: color-mix(in srgb, var(--arc-blue) 12%, transparent);
  padding: 3px 10px;
  border-radius: 980px;
  margin-bottom: 10px;
}
.arc-feature-desc { font-size: 14px; color: var(--arc-text-soft); margin: 0; }

/* ---------- Extend section ---------- */
.arc-extend .arc-code {
  background: var(--arc-bg-soft);
  border: 1px solid var(--arc-line);
  border-radius: var(--arc-radius-sm);
  padding: 20px 22px;
  font-family: "SF Mono", "Menlo", Consolas, monospace;
  font-size: 13px;
  line-height: 1.7;
  color: var(--arc-text);
  overflow-x: auto;
  margin: 16px 0;
}
.arc-p code, .arc-extend code {
  background: var(--arc-bg-soft);
  border-radius: 5px;
  padding: 2px 6px;
  font-family: "SF Mono", "Menlo", Consolas, monospace;
  font-size: 0.9em;
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .arc-hero { padding: 60px 16px 40px; }
  .arc-toolbar-inner { flex-direction: column; align-items: stretch; }
  .arc-search-wrap { max-width: none; }
  .arc-seg { width: 100%; justify-content: center; }
  .arc-model-btn { max-width: 240px; white-space: normal; }
  .arc-product-summary strong { display: block; margin-bottom: 2px; }
  .arc-card-head { padding: 18px 18px; }
  .arc-card-body { padding: 0 18px; }
  .arc-card.open .arc-card-body { padding-bottom: 18px; }
}