:root {
  --bg: #fbfcf9;
  --paper: #ffffff;
  --ink: #17211c;
  --muted: #5d6861;
  --soft-muted: #78847d;
  --line: #dfe6e0;
  --green: #1f7a4d;
  --green-dark: #175f3c;
  --mint: #edf5ef;
  --mint-soft: #f5f9f5;
  --radius: 8px;
}

* {
  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", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
}

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

[hidden] {
  display: none !important;
}

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

.skip-link {
  position: absolute;
  top: -56px;
  left: 16px;
  z-index: 1200;
  border-radius: var(--radius);
  background: var(--paper);
  padding: 10px 14px;
  color: var(--ink);
  box-shadow: 0 12px 30px rgba(31, 49, 39, 0.13);
  transition: top 0.18s ease;
}

.skip-link:focus {
  top: 12px;
}

body.sources-page main.site-main-content.site-content-container {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0;
}

.sources-container {
  width: min(1320px, calc(100% - 64px));
  margin-inline: auto;
}

.sources-hero {
  position: relative;
  isolation: isolate;
  min-height: 250px;
  overflow: hidden;
  border-bottom: 1px solid rgba(219, 228, 220, 0.9);
  background: #f7faf6;
}

.sources-hero::before {
  position: absolute;
  z-index: -2;
  inset: 0;
  background-image: url("../assets/generated/home-authority-sources-bg-v1.png");
  background-position: center right;
  background-size: cover;
  content: "";
}

.sources-hero::after {
  position: absolute;
  z-index: -1;
  inset: 0;
  background: linear-gradient(90deg, rgba(250, 252, 248, 0.99) 0%, rgba(250, 252, 248, 0.95) 38%, rgba(250, 252, 248, 0.56) 58%, rgba(250, 252, 248, 0.02) 78%);
  content: "";
  pointer-events: none;
}

.sources-hero-inner {
  display: flex;
  min-height: 250px;
  align-items: center;
  padding-block: 30px 28px;
}

.sources-hero-copy {
  width: min(670px, 58%);
}

.sources-hero h1 {
  margin-bottom: 14px;
  color: #14231b;
  font-size: clamp(2.7rem, 3.7vw, 3.45rem);
  font-weight: 900;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

.sources-hero p {
  margin-bottom: 0;
  color: #4f5f56;
  font-size: 1rem;
  line-height: 1.78;
}

.sources-hero .sources-hero-emphasis {
  margin-top: 14px;
  color: #405148;
  font-weight: 720;
}

.source-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--green);
  font-weight: 850;
  text-decoration: none;
  white-space: nowrap;
}

.source-link svg {
  width: 17px;
  height: 17px;
  transition: transform 0.18s ease;
}

.source-link:hover svg,
.source-link:focus-visible svg {
  transform: translateX(3px);
}

.source-tools {
  border-bottom: 1px solid #e6ece6;
  background: linear-gradient(100deg, #f8fbf8 0%, #eef5ef 58%, #f8faf7 100%);
}

.source-tools-inner {
  padding-block: 20px 19px;
}

.source-search {
  position: relative;
  display: block;
  width: min(930px, 100%);
}

.source-search > svg {
  position: absolute;
  top: 50%;
  left: 16px;
  width: 20px;
  height: 20px;
  color: #6c7b72;
  transform: translateY(-50%);
  pointer-events: none;
}

.source-search input {
  width: 100%;
  height: 48px;
  border: 1px solid #d8e2da;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
  padding: 0 48px 0 48px;
  color: var(--ink);
  outline: 0;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.source-search input::placeholder {
  color: #89948d;
}

.source-search input:focus {
  border-color: #56916f;
  background: #fff;
  box-shadow: 0 0 0 4px rgba(31, 122, 77, 0.1);
}

.source-search-clear {
  position: absolute;
  top: 50%;
  right: 8px;
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: #637269;
  transform: translateY(-50%);
}

.source-search-clear:hover {
  background: var(--mint);
}

.source-search-clear svg {
  width: 17px;
  height: 17px;
}

.source-filter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin-top: 15px;
}

.source-filters {
  display: flex;
  min-width: 0;
  flex-wrap: wrap;
  gap: 10px;
}

.source-filter {
  min-height: 38px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: #eaf2eb;
  padding: 7px 16px;
  color: #314239;
  font-size: 0.9rem;
  font-weight: 760;
  white-space: nowrap;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.source-filter:hover {
  border-color: #bdcfbf;
  background: #e2eee5;
}

.source-filter[aria-pressed="true"] {
  border-color: var(--green);
  background: var(--green);
  color: #fff;
}

.source-total {
  flex: none;
  margin: 0;
  color: #66736c;
  font-size: 0.94rem;
  white-space: nowrap;
}

.source-directory {
  background: #fdfefc;
}

.source-category {
  border-bottom: 1px solid var(--line);
}

.source-category:first-child {
  border-top: 1px solid transparent;
}

.category-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  min-height: 78px;
}

.category-toggle {
  display: grid;
  width: 100%;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  border: 0;
  background: transparent;
  padding: 13px 0;
  color: inherit;
  text-align: left;
}

.category-number {
  align-self: start;
  padding-top: 1px;
  color: var(--green);
  font-size: 1.95rem;
  font-weight: 520;
  letter-spacing: -0.04em;
  line-height: 1.15;
}

.category-title-row {
  display: flex;
  align-items: baseline;
  gap: 28px;
}

.category-title {
  display: block;
  flex: none;
  margin: 0;
  color: #18221d;
  font-size: 1.28rem;
  font-weight: 860;
  letter-spacing: -0.015em;
  line-height: 1.25;
}

.category-description {
  display: block;
  margin: 0;
  color: #657169;
  font-size: 0.91rem;
  line-height: 1.55;
}

.category-count-wrap {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  color: #617068;
  font-size: 0.91rem;
  white-space: nowrap;
}

.category-count-wrap svg {
  width: 20px;
  height: 20px;
  color: #385247;
  transition: transform 0.22s ease;
}

.source-category.is-open .category-count-wrap svg {
  transform: rotate(180deg);
}

.category-view-all {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 0;
  border-left: 1px solid #dce4de;
  background: transparent;
  padding: 4px 0 4px 19px;
  color: var(--green);
  font-size: 0.91rem;
  font-weight: 850;
  white-space: nowrap;
}

.category-view-all svg {
  width: 17px;
  height: 17px;
  transition: transform 0.18s ease;
}

.category-view-all:hover svg,
.category-view-all:focus-visible svg {
  transform: translateX(3px);
}

.category-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.24s ease;
}

.source-category.is-open .category-panel {
  grid-template-rows: 1fr;
}

.category-panel-inner {
  overflow: hidden;
}

.source-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 0 0 20px 82px;
}

body.sources-page .site-main-content .source-card {
  display: grid;
  min-height: 116px;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto 1fr auto;
  gap: 7px;
  border: 1px solid #dbe4dd;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  padding: 14px 16px 13px;
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

body.sources-page .site-main-content .source-card:hover {
  border-color: #b9cbbd;
  box-shadow: 0 10px 25px rgba(36, 62, 47, 0.05);
  transform: translateY(-1px);
}

body.sources-page .site-main-content .source-card h3 {
  margin: 0;
  overflow-wrap: anywhere;
  color: #17211c;
  font-size: 1rem;
  font-weight: 850;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

body.sources-page .site-main-content .source-card > p {
  margin: 0;
  color: #607068;
  font-size: 0.88rem;
  line-height: 1.55;
}

.source-card-meta {
  display: flex;
  min-width: 0;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
}

.source-institution {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  color: #718078;
  font-size: 0.82rem;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-card-actions {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 14px;
}

.source-type {
  border-radius: 6px;
  background: var(--mint);
  padding: 3px 8px;
  color: #4f7b60;
  font-size: 0.77rem;
  font-weight: 760;
  line-height: 1.45;
  white-space: nowrap;
}

.source-link {
  font-size: 0.84rem;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.source-link svg {
  width: 15px;
  height: 15px;
}

.source-empty {
  width: min(1320px, calc(100% - 64px));
  margin: 0 auto;
  padding: 78px 0 88px;
  text-align: center;
}

.source-empty p {
  margin-bottom: 16px;
  color: #536158;
  font-size: 1.08rem;
}

.source-empty button {
  min-height: 42px;
  border: 1px solid #bbcec0;
  border-radius: 8px;
  background: #fff;
  padding: 8px 16px;
  color: var(--green-dark);
  font-weight: 800;
}

.source-methodology {
  scroll-margin-top: 86px;
  background: linear-gradient(100deg, #f3f8f3 0%, #eaf3ed 52%, #f5f8f4 100%);
  padding-block: 28px 32px;
}

.source-methodology h2 {
  margin-bottom: 18px;
  color: #17231c;
  font-size: 1.55rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

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

.methodology-grid article {
  padding: 0 28px;
}

.methodology-grid article:first-child {
  padding-left: 0;
}

.methodology-grid article + article {
  border-left: 1px solid #d5e2d8;
}

.methodology-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 9px;
}

.methodology-heading span {
  color: var(--green);
  font-size: 0.9rem;
  font-weight: 850;
}

.methodology-heading h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 850;
}

.methodology-grid p {
  margin: 0;
  color: #58665e;
  font-size: 0.88rem;
  line-height: 1.72;
}

.source-filter:focus-visible,
.category-toggle:focus-visible,
.category-view-all:focus-visible,
.source-link:focus-visible,
.source-empty button:focus-visible,
.source-search-clear:focus-visible {
  border-radius: 7px;
  outline: 3px solid rgba(31, 122, 77, 0.22);
  outline-offset: 3px;
}

@media (max-width: 1080px) {
  .sources-container {
    width: min(100% - 64px, 1120px);
  }

  .sources-hero-copy {
    width: min(620px, 65%);
  }

  .source-card-grid {
    padding-left: 64px;
  }

  .category-toggle {
    grid-template-columns: 48px minmax(0, 1fr) auto;
    gap: 14px;
  }

  .category-title-row {
    gap: 18px;
  }
}

@media (max-width: 820px) {
  .sources-hero {
    min-height: 360px;
  }

  .sources-hero::before {
    background-position: 58% center;
  }

  .sources-hero::after {
    background: linear-gradient(90deg, rgba(250, 252, 248, 0.99) 0%, rgba(250, 252, 248, 0.95) 52%, rgba(250, 252, 248, 0.28) 86%);
  }

  .sources-hero-inner {
    min-height: 360px;
  }

  .sources-hero-copy {
    width: 72%;
  }

  .source-filter-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .source-filters {
    width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: thin;
  }

  .category-head {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding-block: 8px;
  }

  .category-title-row {
    display: block;
  }

  .category-description {
    margin-top: 5px;
  }

  .category-view-all {
    justify-self: end;
    margin: -8px 38px 9px 0;
  }

  .source-card-grid {
    padding-left: 0;
  }

  .methodology-grid {
    gap: 24px;
    grid-template-columns: 1fr;
  }

  .methodology-grid article,
  .methodology-grid article:first-child {
    padding: 0;
  }

  .methodology-grid article + article {
    border-top: 1px solid #d5e2d8;
    border-left: 0;
    padding-top: 22px;
  }
}

@media (max-width: 640px) {
  .sources-container,
  .source-empty {
    width: calc(100% - 32px);
  }

  .sources-hero {
    min-height: auto;
    padding-bottom: 170px;
  }

  .sources-hero::before {
    inset: auto 0 0;
    height: 178px;
    background-position: 70% center;
    background-size: cover;
  }

  .sources-hero::after {
    background: linear-gradient(180deg, #f8fbf7 0%, #f8fbf7 58%, rgba(248, 251, 247, 0.9) 67%, rgba(248, 251, 247, 0.16) 88%);
  }

  .sources-hero-inner {
    min-height: auto;
    padding-block: 38px 24px;
  }

  .sources-hero-copy {
    width: 100%;
  }

  .sources-hero h1 {
    margin-bottom: 12px;
    font-size: 2.55rem;
  }

  .sources-hero p {
    font-size: 0.94rem;
    line-height: 1.72;
  }

  .source-tools-inner {
    padding-block: 22px 20px;
  }

  .source-search input {
    height: 46px;
    padding-left: 44px;
    font-size: 0.88rem;
  }

  .source-filter-row {
    margin-top: 16px;
  }

  .source-filter {
    min-height: 36px;
    padding-inline: 13px;
    font-size: 0.84rem;
  }

  .source-total {
    font-size: 0.86rem;
  }

  .category-head {
    min-height: 83px;
  }

  .category-toggle {
    grid-template-columns: 42px minmax(0, 1fr) auto;
    gap: 9px;
    padding-block: 15px;
  }

  .category-number {
    font-size: 1.55rem;
  }

  .category-title {
    font-size: 1.05rem;
  }

  .category-description {
    font-size: 0.84rem;
    line-height: 1.48;
  }

  .category-count-wrap {
    gap: 7px;
    font-size: 0.79rem;
  }

  .category-count-label {
    max-width: 48px;
    line-height: 1.25;
    white-space: normal;
  }

  .category-view-all {
    margin: -5px 25px 9px 51px;
    font-size: 0.84rem;
  }

  .source-card-grid {
    grid-template-columns: 1fr;
    gap: 12px;
    padding-bottom: 21px;
  }

  body.sources-page .site-main-content .source-card {
    min-height: 140px;
    padding: 16px;
  }

  body.sources-page .site-main-content .source-card h3 {
    font-size: 0.96rem;
  }

  .source-card-meta {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .source-institution {
    width: 100%;
    white-space: normal;
  }

  .source-card-actions {
    width: 100%;
    justify-content: space-between;
  }

  .source-methodology {
    padding-block: 31px 38px;
  }

  .source-methodology h2 {
    margin-bottom: 20px;
    font-size: 1.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}