/* No.1工具导航 — 淡蓝科技目录
   冰面白底、钢色正文、天蓝强调；近直角、细线。避开紫渐变与苹果蓝圆角卡。 */

:root {
  --paper: #eef4f9;
  --paper-deep: #e2ecf4;
  --cream: #f7fbfe;
  --cream-2: #ffffff;
  --ink: #1a2a3a;
  --ink-2: #4a6278;
  --ink-3: #7a91a6;
  --line: #c9dce8;
  --line-strong: #adc6d8;
  --persimmon: #3d9ad6;
  --persimmon-deep: #2478b3;
  --persimmon-soft: rgba(61, 154, 214, 0.14);
  --pine: #2f7aa8;
  --pine-soft: rgba(47, 122, 168, 0.12);
  --brass: #5aa0c8;
  --cta: #d4ebf7;
  --shadow: 0 10px 28px rgba(26, 42, 58, 0.07);
  --shadow-print: 6px 6px 0 rgba(61, 154, 214, 0.18);
  --radius: 3px;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
  --space: 1.25rem;
  --max: 1120px;
  --fast: 0.16s ease;
  --med: 0.28s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(61, 154, 214, 0.14), transparent 50%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(160, 214, 236, 0.22), transparent 45%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
  min-height: 100vh;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

.page-shell {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- 刊头 ---------- */

.masthead,
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1rem 0 0.9rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--ink);
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
}

.brand,
.wordmark,
.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand-icon,
.wordmark-mark {
  width: 2.35rem;
  height: 2.35rem;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  background: var(--persimmon);
  color: var(--cream-2);
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1;
  border-radius: 2px;
}

.brand h1,
.wordmark-copy h1 {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.brand p,
.wordmark-copy p {
  font-size: 0.72rem;
  color: var(--ink-2);
  letter-spacing: 0.12em;
  margin-top: 0.15rem;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.nav-link {
  padding: 0.4rem 0.7rem;
  color: var(--ink-2);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: color var(--fast), border-color var(--fast);
}

.nav-link:hover {
  color: var(--ink);
}

.nav-link.active {
  color: var(--ink);
  border-bottom-color: var(--persimmon);
  background: transparent;
  font-weight: 600;
}

.nav-link[target="_blank"] {
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  margin-left: 0.35rem;
  padding: 0.35rem 0.7rem;
  color: var(--ink);
}

.nav-link[target="_blank"]:hover,
.nav-link[target="_blank"].active {
  background: var(--ink);
  color: var(--cream);
  border-bottom-color: var(--ink);
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  font-family: inherit;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--fast), color var(--fast), transform var(--fast), box-shadow var(--fast);
}

.btn-primary {
  background: var(--persimmon);
  color: #f4fafe;
  border-color: var(--persimmon);
}

.btn-primary:hover {
  background: var(--persimmon-deep);
  box-shadow: var(--shadow-print);
  transform: translate(-1px, -1px);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}

.btn-secondary:hover {
  background: var(--ink);
  color: var(--cream);
}

/* ---------- Hero ---------- */

.hero-panel {
  margin-bottom: 2.5rem;
  padding: 0 0 2rem;
  border-bottom: 1px solid var(--line);
  background: none;
  box-shadow: none;
}

.hero-home {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(180px, 0.7fr);
  gap: 2rem 3rem;
  align-items: end;
  position: relative;
}

.hero-home::before {
  content: "壹";
  position: absolute;
  right: 4%;
  top: -1.2rem;
  font-family: var(--serif);
  font-size: clamp(6rem, 16vw, 11rem);
  line-height: 0.8;
  color: var(--ink);
  opacity: 0.05;
  pointer-events: none;
  user-select: none;
}

.hero-copy {
  position: relative;
  max-width: 38rem;
}

.eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--persimmon);
  margin-bottom: 0.75rem;
  background: none;
  padding: 0;
  text-transform: none;
}

.hero-copy h2 {
  font-family: var(--serif);
  font-size: clamp(1.85rem, 4.4vw, 3.05rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: 0.01em;
  text-wrap: pretty;
  margin-bottom: 0.85rem;
}

.hero-copy p {
  font-size: 0.98rem;
  color: var(--ink-2);
  max-width: 42ch;
  margin-bottom: 1.15rem;
}

.hero-search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.35rem 0.35rem 0.9rem;
  background: var(--cream);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  max-width: 32rem;
}

.hero-search:focus-within {
  box-shadow: 3px 3px 0 var(--persimmon);
}

.hero-search input,
#searchInput {
  border: none;
  background: transparent;
  flex: 1;
  min-width: 0;
  font-size: 0.95rem;
  color: var(--ink);
  outline: none;
  font-family: inherit;
}

.hero-search input::placeholder,
#searchInput::placeholder {
  color: var(--ink-3);
}

.search-icon {
  width: 0.85rem;
  height: 0.85rem;
  border: 1.6px solid var(--ink-3);
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
  font-size: 0;
  color: transparent;
}

.search-icon::after {
  content: "";
  position: absolute;
  width: 0.38rem;
  height: 1.5px;
  background: var(--ink-3);
  right: -0.22rem;
  bottom: -0.02rem;
  transform: rotate(45deg);
}

.hero-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-left: 1px solid var(--ink);
  padding-left: 1.5rem;
}

.stat-item {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  background: none;
  text-align: left;
}

.stat-item:last-child {
  border-bottom: none;
}

.stat-item strong {
  display: block;
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat-item span {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--ink-2);
}

/* ---------- 区块 ---------- */

.section {
  margin-bottom: 2.75rem;
}

.section-header {
  margin-bottom: 1.1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--line);
}

.section-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
}

.section-title {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.section-desc {
  font-size: 0.88rem;
  color: var(--ink-2);
  margin-top: 0.2rem;
}

.text-link {
  color: var(--persimmon);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
}

.text-link:hover {
  text-decoration: underline;
}

/* ---------- 分类目录 ---------- */

.category-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--ink);
}

.category-card {
  display: grid;
  grid-template-columns: 2.6rem 1fr auto;
  align-items: center;
  gap: 0.85rem;
  padding: 0.95rem 0.85rem;
  text-decoration: none;
  color: inherit;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
  opacity: 1;
  animation: none;
  transition: background var(--fast), color var(--fast);
}

.category-card:nth-child(2n) {
  border-right: none;
}

.category-card:hover {
  background: var(--ink);
  color: var(--cream);
  transform: none;
  box-shadow: none;
}

.category-index,
.category-icon {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--persimmon);
  letter-spacing: 0.04em;
}

.category-card:hover .category-index,
.category-card:hover .category-icon,
.category-card:hover .category-count,
.category-card:hover .category-desc {
  color: #c5e4f5;
}

.category-name {
  font-size: 1rem;
  font-weight: 650;
  line-height: 1.3;
}

.category-desc {
  font-size: 0.78rem;
  color: var(--ink-2);
  margin-top: 0.1rem;
}

.category-count {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink-3);
  min-width: 1.8em;
  text-align: right;
}

.category-meta {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.category-arrow {
  display: none;
}

/* ---------- 工具卡片 ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.15rem 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--cream);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  min-height: 0;
  overflow: hidden;
  box-shadow: none;
  opacity: 1;
  animation: none;
  transition: transform var(--med), box-shadow var(--med), border-color var(--fast);
}

.card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-print);
  border-color: var(--ink);
}

.card-main {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  flex: 1;
  min-width: 0;
}

.card-cover,
.card-avatar {
  aspect-ratio: 16 / 10;
  width: 100%;
  height: auto;
  background: var(--paper-deep);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.card-cover img,
.card-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}

.card:hover .card-cover img,
.card:hover .card-avatar img {
  transform: scale(1.04);
}

.card-body,
.card-top {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.85rem 0.9rem 0.4rem;
}

.card-top {
  flex-direction: column;
  align-items: stretch;
}

.card-category {
  align-self: flex-start;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--pine);
  background: none;
  padding: 0;
  border-radius: 0;
}

.card-title {
  font-family: var(--serif);
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.3;
}

.card-subtitle {
  font-size: 0.8rem;
  color: var(--ink-2);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-actions {
  display: flex;
  gap: 0.4rem;
  padding: 0.55rem 0.9rem 0.9rem;
  margin-top: auto;
}

.card-link,
.card-link-ghost {
  display: inline-flex;
  align-items: center;
  padding: 0.28rem 0.55rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  margin-top: 0;
}

.card-link {
  background: var(--ink);
  color: var(--cream);
  border: 1px solid var(--ink);
}

.card-link:hover {
  background: var(--persimmon);
  border-color: var(--persimmon);
  transform: none;
  box-shadow: none;
}

.card-link-ghost {
  color: var(--ink-2);
  border: 1px solid var(--line-strong);
  background: transparent;
}

.card-link-ghost:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.page-home .card-grid {
  grid-template-columns: repeat(4, 1fr);
}

/* ---------- 列表页 ---------- */

.page-intro {
  margin: 0 0 1.25rem;
}

.page-intro h2 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 0.35rem;
}

.page-intro p {
  color: var(--ink-2);
  font-size: 0.92rem;
}

.search-section {
  background: var(--cream);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  padding: 0.9rem 1rem 0.85rem;
  margin-bottom: 1.25rem;
  box-shadow: none;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0 0.7rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 0.75rem;
  background: none;
  border-radius: 0;
}

.search-box:focus-within {
  border-bottom-color: var(--persimmon);
  box-shadow: none;
}

.category-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.category-chip {
  padding: 0.28rem 0.65rem;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink-2);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 500;
  font-family: inherit;
  white-space: nowrap;
  transition: background var(--fast), color var(--fast), border-color var(--fast);
}

.category-chip:hover {
  border-color: var(--ink);
  color: var(--ink);
  background: transparent;
}

.category-chip.active {
  background: var(--persimmon);
  color: #f4fafe;
  border-color: var(--persimmon);
  box-shadow: none;
}

.content-section {
  flex: 1;
}

.list-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.9rem;
  flex-wrap: wrap;
}

.stats-row {
  font-size: 0.88rem;
  color: var(--ink-2);
}

.stats-row strong {
  font-family: var(--serif);
  color: var(--ink);
  font-size: 1rem;
}

.page-info {
  font-size: 0.78rem;
  color: var(--ink-3);
}

.empty-state {
  grid-column: 1 / -1;
  padding: 3rem 1rem;
  text-align: center;
  border: 1px dashed var(--line-strong);
  color: var(--ink-2);
  background: var(--cream);
}

/* ---------- 分页 ---------- */

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.3rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.pagination-btn {
  min-width: 2rem;
  height: 2rem;
  padding: 0 0.55rem;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink-2);
  cursor: pointer;
  font-size: 0.82rem;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.pagination-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.pagination-btn.active {
  background: var(--ink);
  color: var(--cream);
  border-color: var(--ink);
}

.pagination-ellipsis {
  color: var(--ink-3);
  padding: 0 0.25rem;
}

/* ---------- 步骤 / CTA ---------- */

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--ink);
}

.step-card {
  padding: 1.25rem 1.1rem 1.4rem;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
}

.step-card:last-child {
  border-right: none;
}

.step-num {
  display: inline-block;
  width: auto;
  height: auto;
  background: none;
  color: var(--persimmon);
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.55rem;
  border-radius: 0;
}

.step-card h3 {
  font-family: var(--serif);
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.step-card p {
  font-size: 0.88rem;
  color: var(--ink-2);
}

.cta-band {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  background: var(--cta);
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 1.6rem 1.5rem;
  margin-bottom: 2rem;
  box-shadow: none;
}

.cta-band h2 {
  font-family: var(--serif);
  font-size: 1.35rem;
  margin-bottom: 0.3rem;
}

.cta-band p {
  font-size: 0.88rem;
  color: var(--ink-2);
}

.cta-band .btn-primary {
  background: var(--persimmon);
  flex-shrink: 0;
}

/* ---------- 详情页 ---------- */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  font-size: 0.78rem;
  color: var(--ink-3);
  margin-bottom: 1.25rem;
}

.breadcrumb a {
  color: var(--ink-2);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--persimmon);
}

.detail-panel {
  display: grid;
  grid-template-columns: minmax(220px, 280px) 1fr;
  gap: 2rem;
  background: var(--cream);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2.25rem;
  box-shadow: var(--shadow-print);
}

.detail-cover {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 2px;
  overflow: hidden;
  background: var(--paper-deep);
  border: 1px solid var(--line);
}

.detail-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail-cat {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--pine);
  text-decoration: none;
  background: none;
  padding: 0;
  margin-bottom: 0.55rem;
}

.detail-copy h1 {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3.4vw, 2.45rem);
  letter-spacing: 0.01em;
  line-height: 1.2;
  margin-bottom: 0.7rem;
}

.detail-copy p {
  color: var(--ink-2);
  max-width: 46ch;
  margin-bottom: 1.25rem;
  font-size: 1rem;
}

.detail-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 1.25rem;
  margin: 0 0 1.25rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.detail-meta div {
  min-width: 0;
}

.detail-meta dt {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--ink-3);
  margin-bottom: 0.15rem;
}

.detail-meta dd {
  font-size: 0.9rem;
  word-break: break-all;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--ink);
}

.related-card {
  display: grid;
  grid-template-columns: 3.25rem 1fr;
  gap: 0.75rem;
  align-items: center;
  text-decoration: none;
  color: inherit;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-radius: 0;
  padding: 0.85rem 0.75rem;
  box-shadow: none;
}

.related-card:nth-child(2n) {
  border-right: none;
}

.related-card:hover {
  background: var(--cream);
  box-shadow: none;
}

.related-card img {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 2px;
  object-fit: cover;
  background: var(--paper-deep);
  border: 1px solid var(--line);
}

.related-card strong {
  display: block;
  font-family: var(--serif);
  font-size: 0.95rem;
}

.related-card span {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 0.75rem;
  color: var(--ink-2);
}

/* ---------- 页脚 ---------- */

.page-footer {
  margin-top: auto;
  padding: 1.5rem 0 0.5rem;
  background: none;
  border: 0;
  border-top: 1px solid var(--ink);
  border-radius: 0;
  box-shadow: none;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 1rem;
}

.footer-links a {
  color: var(--ink-2);
  text-decoration: none;
  font-size: 0.85rem;
}

.footer-links a:hover {
  color: var(--persimmon);
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--ink-3);
}

/* ---------- 动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ---------- 响应式 ---------- */

@media (max-width: 1020px) {
  .card-grid,
  .page-home .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

}

@media (max-width: 900px) {
  .hero-home {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .hero-home::before {
    top: -0.5rem;
    right: 0;
  }

  .hero-stats {
    grid-template-columns: 1fr 1fr;
    border-left: none;
    padding-left: 0;
    border-top: 1px solid var(--ink);
  }

  .stat-item {
    padding: 0.85rem 1rem 0.85rem 0;
  }

  .stat-item:first-child {
    border-right: 1px solid var(--line);
    padding-right: 1rem;
  }

  .masthead,
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    position: static;
  }

  .topnav {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .steps-grid,
  .cta-band,
  .detail-panel {
    grid-template-columns: 1fr;
  }

  .cta-band {
    flex-direction: column;
    align-items: flex-start;
  }

  .step-card,
  .step-card:last-child {
    border-right: none;
  }

  .detail-cover {
    aspect-ratio: 16 / 9;
    max-height: 240px;
  }

  .card-grid,
  .page-home .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

}

@media (max-width: 640px) {
  .page-shell {
    padding: 0 0.9rem 2rem;
  }

  .hero-copy h2 {
    font-size: 1.7rem;
  }

  .hero-search {
    flex-wrap: wrap;
    padding: 0.55rem;
  }

  .hero-search .btn {
    width: 100%;
  }

  .category-grid,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .category-card,
  .category-card:nth-child(2n),
  .related-card,
  .related-card:nth-child(2n) {
    border-right: none;
  }

  .card-grid,
  .page-home .card-grid {
    grid-template-columns: 1fr;
  }


  .category-bar {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 0.2rem;
  }

  .category-bar::-webkit-scrollbar {
    display: none;
  }

  .section-header-row,
  .footer-content,
  .list-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .detail-meta {
    grid-template-columns: 1fr;
  }

  .brand h1,
  .wordmark-copy h1 {
    font-size: 1.02rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #12202c;
    --paper-deep: #173044;
    --cream: #173044;
    --cream-2: #1c3a50;
    --ink: #e8f4fb;
    --ink-2: #a9c7db;
    --ink-3: #6f91a8;
    --line: #2a4a62;
    --line-strong: #3a6280;
    --persimmon: #5eb3e4;
    --persimmon-deep: #3d9ad6;
    --pine: #7ec4ea;
    --cta: #1a3a52;
  }

  body {
    background-image:
      radial-gradient(ellipse 70% 40% at 0% 0%, rgba(94, 179, 228, 0.16), transparent 50%),
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.07'/%3E%3C/svg%3E");
  }

  .masthead,
  .topbar {
    background: color-mix(in srgb, var(--paper) 90%, transparent);
  }

  .card:hover {
    box-shadow: 6px 6px 0 rgba(94, 179, 228, 0.28);
  }
}