:root {
  --bg: #f5f7fb;
  --surface: #fff;
  --line: #d8e1ee;
  --line-strong: #bdc9da;
  --primary: #1d65d8;
  --primary-dark: #164fa9;
  --text: #162033;
  --muted: #667085;
  --soft: #eef4ff;
  --green: #128044;
  --orange: #b65c00;
  --red: #b42318;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 32px));
  min-height: 58px;
  margin: 0 auto;
  gap: 24px;
}

.brand,
.nav a {
  color: var(--text);
  text-decoration: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  white-space: nowrap;
}

.brand-mark,
.tool-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  color: #fff;
  background: var(--primary);
  font-weight: 700;
}

.brand-mark {
  width: 34px;
  height: 34px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 4px;
}

.nav a {
  border-bottom: 2px solid transparent;
  padding: 18px 14px 16px;
  color: #3b4658;
  font-size: 15px;
}

.nav a:hover,
.nav a.is-active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

main,
.footer {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.view {
  display: none;
  padding: 22px 0 26px;
}

.view.is-active {
  display: block;
}

.masthead,
.page-title,
.panel,
.tool-card,
.index-card,
.search-panel,
.today-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.masthead {
  display: grid;
  grid-template-columns: 1fr 150px;
  gap: 20px;
  align-items: center;
  padding: 28px;
  background: linear-gradient(180deg, #fff 0%, #f9fbff 100%);
}

.crumb {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: 32px;
  line-height: 1.25;
}

h2 {
  margin-bottom: 0;
  font-size: 20px;
}

.lead {
  max-width: 640px;
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.7;
}

.today-box {
  padding: 18px;
  text-align: center;
}

.today-box span,
.today-box small {
  display: block;
  color: var(--muted);
}

.today-box strong {
  display: block;
  margin: 4px 0;
  color: var(--primary);
  font-size: 42px;
  line-height: 1;
}

.search-panel {
  display: grid;
  grid-template-columns: 1fr 124px;
  gap: 10px;
  margin-top: 16px;
  padding: 12px;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 11px 12px;
  color: var(--text);
  background: #fff;
  outline: none;
}

textarea {
  resize: vertical;
}

input:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(29, 101, 216, 0.12);
}

.search-panel input {
  border-color: var(--line-strong);
  font-size: 16px;
}

.primary-btn,
.plain-btn,
.search-panel button,
.hot-row button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 6px;
  padding: 0 16px;
  font-weight: 700;
  text-decoration: none;
}

.primary-btn,
.search-panel button {
  border: 0;
  color: #fff;
  background: var(--primary);
}

.primary-btn:hover,
.search-panel button:hover {
  background: var(--primary-dark);
}

.plain-btn,
.hot-row button {
  border: 1px solid var(--line);
  color: var(--text);
  background: #fff;
}

.plain-btn:hover,
.hot-row button:hover,
.index-card:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.hot-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 18px;
}

.panel,
.tool-index {
  margin-top: 18px;
}

.panel,
.page-title {
  padding: 22px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  padding: 0 11px;
  color: var(--primary);
  background: var(--soft);
  font-size: 13px;
  font-weight: 700;
}

.report-grid {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 16px;
}

.score-card {
  border-radius: 8px;
  padding: 20px;
  color: #fff;
  background: #1d65d8;
}

.score-card span,
.score-card p {
  color: rgba(255, 255, 255, 0.86);
}

.score-card strong {
  display: block;
  margin: 8px 0;
  font-size: 48px;
  line-height: 1;
}

.checks,
.mini-report {
  display: grid;
  gap: 10px;
}

.check-item,
.mini-item,
.empty-state,
.result-box,
.serp-preview {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcff;
}

.check-item,
.mini-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
}

.check-item strong,
.mini-item strong {
  font-size: 14px;
}

.check-item p,
.mini-item p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.state-good {
  color: var(--green);
}

.state-warn {
  color: var(--orange);
}

.state-bad {
  color: var(--red);
}

.empty-state,
.result-box,
.mini-report {
  padding: 14px;
  color: var(--muted);
  line-height: 1.65;
}

.tool-index {
  padding-bottom: 8px;
}

.index-grid,
.tool-grid {
  display: grid;
  gap: 14px;
}

.index-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.index-card {
  display: grid;
  gap: 8px;
  min-height: 112px;
  padding: 18px;
  text-align: left;
}

.index-card span {
  color: var(--primary);
  font-weight: 700;
}

.index-card strong {
  color: #344054;
  font-size: 15px;
  line-height: 1.55;
}

.page-title {
  margin-bottom: 16px;
}

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

.tool-card {
  display: grid;
  align-content: start;
  gap: 14px;
  min-height: 250px;
  padding: 20px;
}

.tool-card.wide {
  grid-column: span 2;
}

.tool-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tool-icon {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  font-size: 12px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

label {
  display: grid;
  gap: 8px;
  color: #344054;
  font-size: 14px;
  font-weight: 700;
}

.inline-options,
.button-row,
.hint-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.inline-options label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 400;
}

.inline-options input {
  width: auto;
}

.serp-preview {
  padding: 16px;
}

.serp-preview a {
  display: block;
  margin-bottom: 5px;
  color: #1a0dab;
  font-size: 19px;
  text-decoration: none;
}

.serp-preview span {
  display: block;
  margin-bottom: 7px;
  color: #188038;
  font-size: 13px;
}

.serp-preview p {
  margin-bottom: 0;
  color: #545454;
  line-height: 1.55;
}

.hint-row span {
  border-radius: 999px;
  padding: 7px 10px;
  color: var(--muted);
  background: var(--soft);
  font-size: 13px;
}

.output,
.output-line {
  color: #0f172a;
  background: #f8fafc;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.metric-grid span {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  color: #344054;
  background: #fbfcff;
}

.apps-hero,
.apps-section,
.app-guide-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.apps-hero {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 24px;
  align-items: center;
  margin-bottom: 16px;
  padding: 24px;
  background: linear-gradient(180deg, #fff 0%, #f9fbff 100%);
}

.apps-icon-stack {
  position: relative;
  min-height: 190px;
}

.apps-icon-stack img {
  position: absolute;
  width: 112px;
  height: 112px;
  border: 4px solid #fff;
  border-radius: 18px;
  box-shadow: 0 10px 24px rgba(22, 58, 112, 0.16);
  object-fit: cover;
}

.apps-icon-stack img:nth-child(1) {
  top: 16px;
  left: 10px;
  z-index: 3;
}

.apps-icon-stack img:nth-child(2) {
  top: 54px;
  left: 86px;
  z-index: 2;
}

.apps-icon-stack img:nth-child(3) {
  top: 4px;
  left: 120px;
  z-index: 1;
}

.notice {
  margin: 0 0 16px;
  border-left: 4px solid var(--primary);
  border-radius: 8px;
  padding: 13px 15px;
  color: #344054;
  background: var(--soft);
  line-height: 1.6;
}

.apps-section {
  padding: 20px;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.app-guide-card {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
}

.app-guide-card img {
  width: 78px;
  height: 78px;
  border-radius: 12px;
  object-fit: cover;
}

.app-guide-card span {
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
}

.app-guide-card h3 {
  margin: 3px 0 6px;
  font-size: 18px;
}

.app-guide-card p,
.compact-faq p,
.apps-section li {
  color: var(--muted);
  line-height: 1.6;
}

.app-guide-card p {
  margin-bottom: 10px;
}

.app-guide-card a {
  color: var(--primary);
  font-weight: 700;
  text-decoration: none;
}

.app-guide-card a:hover {
  text-decoration: underline;
}

.apps-info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.apps-section ol {
  margin: 12px 0 0;
  padding-left: 22px;
}

.compact-faq {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.compact-faq + .compact-faq {
  margin-top: 12px;
}

.compact-faq h3 {
  margin-bottom: 6px;
  font-size: 16px;
}

.compact-faq p {
  margin-bottom: 0;
}

.app-detail-title {
  display: grid;
  gap: 8px;
}

.app-detail-title .plain-btn {
  justify-self: start;
}

.app-detail {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 16px;
}

.app-detail-side,
.app-detail-body {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.app-detail-side {
  display: grid;
  align-content: start;
  gap: 14px;
  padding: 20px;
  text-align: center;
}

.app-detail-side img {
  width: 150px;
  height: 150px;
  justify-self: center;
  border-radius: 18px;
  object-fit: cover;
  box-shadow: 0 10px 24px rgba(22, 58, 112, 0.16);
}

.guide-category {
  border-radius: 999px;
  padding: 8px 10px;
  color: var(--primary);
  background: var(--soft);
  font-size: 13px;
  font-weight: 700;
}

.guide-download,
.guide-report {
  width: 100%;
}

.guide-rating {
  display: grid;
  justify-items: center;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbff;
}

.guide-rating strong {
  color: var(--text);
  font-size: 24px;
  line-height: 1;
}

.guide-rating small {
  color: var(--muted);
  font-size: 13px;
}

.guide-rating p,
.guide-status {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.guide-meta {
  display: grid;
  gap: 8px;
  margin: 0;
  text-align: left;
}

.guide-meta div {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.guide-meta dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.guide-meta dd {
  margin: 0;
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.guide-status {
  min-height: 20px;
  text-align: left;
}

.app-detail-body {
  display: grid;
  gap: 14px;
  padding: 20px;
}

.guide-section {
  padding: 18px;
}

.guide-section p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.footer {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  border-top: 1px solid var(--line);
  padding: 22px 0 34px;
  color: var(--muted);
  font-size: 14px;
}

.footer span:first-child {
  color: var(--text);
  font-weight: 700;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 900px) {
  .index-grid,
  .tool-grid,
  .apps-grid,
  .apps-info-grid {
    grid-template-columns: 1fr;
  }

  .tool-card.wide {
    grid-column: auto;
  }
}

@media (max-width: 720px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
    gap: 10px;
  }

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

  .nav a {
    padding: 8px 10px;
  }

  .masthead,
  .apps-hero,
  .app-detail,
  .search-panel,
  .report-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 26px;
  }

  .check-item,
  .mini-item {
    grid-template-columns: 1fr;
  }
}