:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --surface-soft: #eef4f2;
  --ink: #20252b;
  --muted: #5f6874;
  --line: #d9dee7;
  --green: #19705a;
  --blue: #285a9b;
  --amber: #9a5c09;
  --coral: #b94735;
  --shadow: 0 12px 30px rgba(32, 37, 43, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--green);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(40, 90, 155, 0.45);
  outline-offset: 3px;
}

button,
input {
  font: inherit;
}

img,
svg {
  max-width: 100%;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 10;
  background: var(--ink);
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  border-bottom: 1px solid rgba(217, 222, 231, 0.86);
  background: rgba(247, 248, 251, 0.94);
  backdrop-filter: blur(14px);
}

.nav-wrap,
.section-inner,
.footer-inner {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-width: max-content;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font-weight: 800;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.25rem;
}

.site-nav a {
  border-radius: 7px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 650;
  padding: 0.5rem 0.7rem;
}

.site-nav a[aria-current="page"],
.site-nav a:hover {
  background: var(--surface);
  color: var(--ink);
}

.hero {
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(25, 112, 90, 0.12), rgba(40, 90, 155, 0.08)),
    url("data:image/svg+xml,%3Csvg width='1400' height='760' viewBox='0 0 1400 760' xmlns='http://www.w3.org/2000/svg'%3E%3Crect width='1400' height='760' fill='%23f7f8fb'/%3E%3Cg fill='none' stroke='%23d7dedb' stroke-width='1'%3E%3Cpath d='M0 120H1400M0 240H1400M0 360H1400M0 480H1400M0 600H1400M120 0V760M300 0V760M480 0V760M660 0V760M840 0V760M1020 0V760M1200 0V760'/%3E%3C/g%3E%3Cg fill='%2319705a' fill-opacity='0.12'%3E%3Crect x='170' y='124' width='220' height='82' rx='8'/%3E%3Crect x='890' y='136' width='280' height='74' rx='8'/%3E%3Crect x='615' y='395' width='360' height='94' rx='8'/%3E%3C/g%3E%3Cg fill='%23285a9b' fill-opacity='0.1'%3E%3Crect x='420' y='250' width='260' height='62' rx='8'/%3E%3Crect x='1060' y='475' width='190' height='90' rx='8'/%3E%3C/g%3E%3C/svg%3E");
  background-position: center;
  background-size: cover;
}

.hero .section-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  gap: 2rem;
  min-height: 520px;
  padding: 5.5rem 0 3rem;
}

.hero-copy {
  align-self: center;
  min-width: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--green);
  font-size: 0.88rem;
  font-weight: 760;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 3px;
  background: var(--green);
}

h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.18;
  letter-spacing: 0;
  margin: 0;
  overflow-wrap: anywhere;
}

h1 {
  max-width: 760px;
  font-size: clamp(2.35rem, 6vw, 5.4rem);
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.55rem);
}

h3 {
  font-size: 1.12rem;
}

p {
  margin: 0;
  overflow-wrap: anywhere;
}

.hero-lede {
  max-width: 720px;
  color: #39414b;
  font-size: 1.13rem;
  margin-top: 1.2rem;
}

.hero-line {
  display: block;
}

.mobile-line {
  display: inline;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.7rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 1px solid var(--ink);
  border-radius: 7px;
  background: var(--ink);
  color: #fff;
  font-weight: 750;
  padding: 0.62rem 0.95rem;
}

.button:hover {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.75);
  color: var(--ink);
}

.button.secondary:hover {
  background: #fff;
  border-color: var(--green);
  color: var(--green);
}

.button.hot {
  border-color: var(--coral);
  background: var(--coral);
}

.button.hot:hover {
  border-color: #8f2f22;
  background: #8f2f22;
}

.button.full {
  width: 100%;
}

.payment-note {
  color: var(--muted);
  font-size: 0.86rem;
}

.hero-panel {
  align-self: end;
  border: 1px solid rgba(217, 222, 231, 0.9);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
  padding: 1rem;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}

.metric {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.8rem;
}

.metric strong {
  display: block;
  font-size: 1.45rem;
  line-height: 1;
}

.metric span {
  color: var(--muted);
  font-size: 0.85rem;
}

.section {
  padding: 4rem 0;
}

.section.tight {
  padding: 2.4rem 0;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.section-head p {
  max-width: 640px;
  color: var(--muted);
  margin-top: 0.5rem;
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card,
.article-card,
.resource-card,
.ad-slot {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.card,
.article-card,
.resource-card {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  min-height: 100%;
  padding: 1.1rem;
}

.card p,
.article-card p,
.resource-card p {
  color: var(--muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tag {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 650;
  padding: 0.2rem 0.55rem;
}

.tag.hot {
  border-color: rgba(185, 71, 53, 0.26);
  background: #fff2ef;
  color: var(--coral);
}

.tag.paid {
  border-color: rgba(154, 92, 9, 0.28);
  background: #fff8e9;
  color: var(--amber);
}

.tag.free {
  border-color: rgba(25, 112, 90, 0.24);
  background: #eff8f5;
  color: var(--green);
}

.card-link {
  color: var(--green);
  font-weight: 760;
  margin-top: auto;
}

.accent-green {
  border-top: 4px solid var(--green);
}

.accent-blue {
  border-top: 4px solid var(--blue);
}

.accent-amber {
  border-top: 4px solid var(--amber);
}

.accent-coral {
  border-top: 4px solid var(--coral);
}

.offer-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.2rem;
  align-items: center;
  width: 100%;
  max-width: 100%;
  border: 1px solid rgba(185, 71, 53, 0.28);
  border-radius: 8px;
  background: linear-gradient(90deg, #fff8f3, #ffffff);
  box-shadow: var(--shadow);
  padding: 1.15rem;
}

.offer-copy {
  display: grid;
  gap: 0.65rem;
  min-width: 0;
}

.offer-copy p {
  color: var(--muted);
}

.offer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.offer-action {
  display: grid;
  gap: 0.7rem;
  justify-items: end;
  min-width: 190px;
}

.price {
  color: var(--coral);
  font-size: 1.55rem;
  font-weight: 850;
  line-height: 1;
}

.price small {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 650;
}

.conversion-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(210px, 280px);
  gap: 1rem;
  align-items: center;
  border: 1px solid rgba(185, 71, 53, 0.34);
  border-radius: 8px;
  background: #fff7f4;
  box-shadow: var(--shadow);
  padding: 1.1rem;
}

.seo-focus-card,
.seo-summary-card {
  border-color: rgba(25, 112, 90, 0.24);
  background: linear-gradient(90deg, #f4fbf8, #ffffff);
}

.conversion-copy {
  display: grid;
  gap: 0.55rem;
  min-width: 0;
}

.conversion-copy p {
  color: var(--muted);
}

.conversion-action {
  display: grid;
  gap: 0.55rem;
}

.ad-slot {
  display: grid;
  min-height: 112px;
  place-items: center;
  padding: 1rem;
  text-align: center;
  color: var(--muted);
  background: repeating-linear-gradient(
    -45deg,
    #ffffff,
    #ffffff 10px,
    #f1f4f7 10px,
    #f1f4f7 20px
  );
}

.ad-slot strong {
  display: block;
  color: var(--ink);
}

.feature-band {
  background: var(--surface-soft);
  border-block: 1px solid var(--line);
}

.article-hero {
  background: var(--surface-soft);
  border-bottom: 1px solid var(--line);
}

.article-hero .section-inner {
  padding: 4rem 0 2.6rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 1rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: var(--green);
  font-weight: 700;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 2rem;
  align-items: start;
}

.article-body {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: clamp(1.1rem, 3vw, 2rem);
}

.article-body h2 {
  font-size: 1.45rem;
  margin-top: 2rem;
}

.article-body h2:first-child {
  margin-top: 0;
}

.article-body p,
.article-body ul,
.article-body ol {
  color: #39414b;
  margin: 0.85rem 0 0;
}

.article-body li {
  margin: 0.35rem 0;
}

.article-image {
  margin: 0 0 1.15rem;
}

.article-image picture {
  display: block;
}

.article-image img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.article-image figcaption {
  color: var(--muted);
  font-size: 0.86rem;
  margin-top: 0.45rem;
}

.article-body pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f3f6f5;
  margin: 1rem 0 0;
  padding: 0.9rem;
}

.article-body code {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.article-body table {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin-top: 1rem;
  white-space: nowrap;
}

.article-body th,
.article-body td {
  border: 1px solid var(--line);
  padding: 0.65rem;
  text-align: left;
  vertical-align: top;
}

.article-body th {
  background: #f3f6f5;
}

.note {
  border-left: 4px solid var(--green);
  background: #f1f7f5;
  border-radius: 0 8px 8px 0;
  margin-top: 1rem;
  padding: 0.9rem 1rem;
}

.sidebar {
  display: grid;
  gap: 1rem;
  position: sticky;
  top: 88px;
}

.toc {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 1rem;
}

.toc strong {
  display: block;
  margin-bottom: 0.6rem;
}

.toc a {
  display: block;
  color: var(--muted);
  padding: 0.25rem 0;
}

.article-pager {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  padding-top: 1rem;
}

.compact-list {
  display: grid;
  gap: 0.45rem;
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
}

.compact-list a {
  color: var(--green);
  font-weight: 700;
}

.search-panel {
  display: grid;
  gap: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: clamp(1rem, 3vw, 1.4rem);
}

.search-panel label {
  font-weight: 800;
}

.search-panel input {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  padding: 0.65rem 0.8rem;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-chip {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  font-weight: 700;
  padding: 0.45rem 0.75rem;
}

.filter-chip.is-active,
.filter-chip:hover {
  border-color: var(--green);
  background: #eef7f3;
  color: var(--green);
}

.tag-filter {
  max-height: 7.2rem;
  overflow: auto;
  padding-right: 0.25rem;
}

.search-count,
.empty-state {
  color: var(--muted);
}

.list-links {
  display: grid;
  gap: 0.75rem;
}

.list-links a {
  border-bottom: 1px solid var(--line);
  color: var(--green);
  font-weight: 700;
  padding-bottom: 0.7rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #20252b;
  color: #dbe2ea;
  padding: 2.4rem 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: start;
}

.footer-inner p {
  max-width: 680px;
  color: #b7c0ca;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.9rem;
}

.footer-links a:hover {
  color: #fff;
}

@media (max-width: 900px) {
  .hero .section-inner,
  .article-layout,
  .offer-card,
  .conversion-card,
  .grid.three,
  .grid.two {
    grid-template-columns: 1fr;
  }

  .hero .section-inner {
    min-height: auto;
    padding-top: 4rem;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 680px) {
  .nav-wrap,
  .section-inner,
  .footer-inner {
    width: calc(100% - 1rem);
  }

  .nav-wrap,
  .section-head,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .site-nav a {
    padding: 0.45rem 0.55rem;
  }

  .button {
    min-height: 50px;
    padding-inline: 1rem;
  }

  .section {
    padding: 3rem 0;
  }

  .hero-copy,
  .hero-lede {
    max-width: 100%;
    width: 100%;
  }

  .hero-actions .button.hot {
    width: 100%;
  }

  h1 {
    font-size: 2.15rem;
    word-break: break-all;
  }

  .hero-lede {
    font-size: 1rem;
    word-break: break-all;
  }

  .mobile-line {
    display: block;
  }

  .metric-grid {
    grid-template-columns: 1fr;
  }

  .footer-links {
    justify-content: flex-start;
  }

  .offer-action {
    justify-items: stretch;
    min-width: 0;
  }

  .article-hero h1,
  .article-hero .hero-lede,
  .offer-card h2,
  .offer-card p,
  .article-card h2,
  .article-card p,
  .card p {
    line-break: anywhere;
    word-break: break-all;
  }

  .article-hero .section-inner,
  .conversion-card,
  .conversion-copy,
  .article-body {
    max-width: calc(100vw - 1rem);
    overflow: hidden;
  }

  .article-hero h1 {
    display: block;
    width: calc(100vw - 1rem);
    max-width: 100%;
    font-size: 1.68rem;
    line-height: 1.28;
    white-space: normal;
  }

  .conversion-card h2 {
    font-size: 1.45rem;
    line-height: 1.25;
  }

  .conversion-copy,
  .conversion-card h2,
  .conversion-card p {
    display: block;
    width: calc(100vw - 3rem);
    max-width: 100%;
    white-space: normal;
  }

  .offer-card {
    overflow: hidden;
  }

  .offer-card .button {
    max-width: 100%;
    width: 100%;
  }

  .conversion-card h2,
  .conversion-card p {
    line-break: anywhere;
    word-break: break-all;
  }
}