:root {
  --arm-yellow: #ffb81c;
  --arm-yellow-soft: rgba(255, 184, 28, 0.16);
  --arm-black: #231f20;
  --arm-grey-50: #f7f7f8;
  --arm-grey-100: #f0f0f2;
  --arm-grey-200: #e2e2e5;
  --arm-grey-300: #d0d0d4;
  --arm-grey-500: #8b8d91;
  --arm-grey-700: #5c5e62;
  --surface: #ffffff;
  --shadow-soft: 0 8px 20px rgba(35, 31, 32, 0.05);
  --radius: 10px;
  --page-max: 1080px;
  --font-sans: "IBM Plex Sans", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "Cascadia Code", Menlo, monospace;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--arm-black);
  background:
    radial-gradient(900px 360px at 50% -100px, rgba(255, 184, 28, 0.14), transparent 60%),
    linear-gradient(180deg, #fff 0%, var(--arm-grey-50) 220px);
  line-height: 1.5;
}

a {
  color: var(--arm-black);
}

a:hover {
  color: var(--arm-grey-700);
}

button,
input {
  font: inherit;
}

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 1.1rem 1.25rem 0.25rem;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
  text-decoration: none;
  color: inherit;
}

.site-header__logo {
  height: 32px;
  width: auto;
  flex-shrink: 0;
}

.site-header__title {
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  min-width: 0;
}

.site-header__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.4rem;
}

.site-header__nav a {
  font-size: 0.8125rem;
  text-decoration: none;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--arm-grey-200);
  border-radius: 999px;
  background: var(--surface);
  white-space: nowrap;
}

.site-header__nav a:hover {
  border-color: var(--arm-yellow);
}

.ard-corner {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  flex-shrink: 0;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--arm-grey-200);
  border-radius: 8px;
  background: var(--arm-black);
  color: #fff;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1;
  box-shadow: var(--shadow-soft);
}

.ard-corner:hover {
  color: #fff;
  border-color: var(--arm-yellow);
  background: #2f2b2c;
}

.ard-corner__arrow {
  font-size: 0.85rem;
  line-height: 1;
}

@media (max-width: 820px) {
  .site-header {
    flex-wrap: wrap;
    align-items: flex-start;
  }

  .site-header__actions {
    width: 100%;
    justify-content: flex-start;
  }

  .site-header__nav a {
    white-space: normal;
    text-align: center;
  }
}

.hero {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 2rem 1.25rem 1rem;
  text-align: center;
}

.hero__heading {
  margin: 0 auto 0.55rem;
  max-width: 20ch;
  font-size: clamp(1.6rem, 3.2vw, 2.15rem);
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.hero__lede {
  margin: 0 auto 1.25rem;
  max-width: 46ch;
  color: var(--arm-grey-700);
  font-size: 0.98rem;
}

.search-form {
  display: flex;
  justify-content: center;
  margin-bottom: 0.95rem;
}

.search-form input {
  width: 100%;
  max-width: 560px;
  padding: 0.75rem 1rem;
  border: 1px solid var(--arm-grey-200);
  border-radius: 999px;
  background: var(--surface);
  color: var(--arm-black);
  box-shadow: var(--shadow-soft);
  text-align: left;
}

.search-form input:focus {
  outline: 2px solid var(--arm-yellow);
  outline-offset: 1px;
  border-color: var(--arm-yellow);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  margin-bottom: 0.55rem;
}

.filter-chip {
  border: 1px solid var(--arm-grey-200);
  background: var(--surface);
  color: var(--arm-black);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  font-size: 0.78rem;
  cursor: pointer;
}

.filter-chip:hover {
  border-color: var(--arm-grey-300);
}

.filter-chip.is-active {
  border-color: var(--arm-yellow);
  background: var(--arm-yellow-soft);
}

.filter-chip__count {
  margin-left: 0.3rem;
  color: var(--arm-grey-500);
}

.results-meta {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--arm-grey-500);
  text-align: center;
}

.browse {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0.5rem 1.25rem 2.5rem;
}

.results-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.65rem;
  align-items: start;
}

@media (min-width: 720px) {
  .results-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .results-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.result-item {
  margin: 0;
  border: 1px solid var(--arm-grey-200);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.result-item.is-expanded {
  border-color: var(--arm-yellow);
  box-shadow: var(--shadow-soft);
  grid-column: 1 / -1;
}

.result-item__summary {
  width: 100%;
  height: 168px;
  display: flex;
  flex-direction: column;
  text-align: left;
  padding: 0.8rem 0.85rem;
  border: 0;
  background: transparent;
  cursor: pointer;
  color: inherit;
}

.result-item.is-expanded .result-item__summary {
  height: auto;
}

.result-item__summary:hover {
  background: rgba(255, 184, 28, 0.04);
}

.result-item__title {
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.result-item.is-expanded .result-item__title {
  display: block;
  -webkit-line-clamp: unset;
  line-clamp: unset;
  overflow: visible;
}

.result-item__type {
  display: inline-flex;
  align-self: flex-start;
  margin-bottom: 0.4rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--arm-grey-700);
  background: var(--arm-grey-100);
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
}

.result-item__type[data-category="stack"] {
  background: #eef6ff;
  color: #355a8a;
}

.result-item__type[data-category="framework-tool"] {
  background: #f3f0ff;
  color: #5b4a8a;
}

.result-item__type[data-category="skill"] {
  background: #eefaf1;
  color: #2f6b45;
}

.result-item__type[data-category="digital-twin"] {
  background: #eef6fb;
  color: #2f5f7a;
}

.result-item__description {
  margin: 0;
  font-size: 0.8rem;
  color: var(--arm-grey-700);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.result-item.is-expanded .result-item__description {
  display: block;
  -webkit-line-clamp: unset;
  line-clamp: unset;
  overflow: visible;
  flex: none;
  margin-bottom: 0.55rem;
}

.result-item__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-top: auto;
  max-height: 1.55rem;
  overflow: hidden;
}

.result-item.is-expanded .result-item__meta {
  max-height: none;
  overflow: visible;
}

.tag {
  font-size: 0.72rem;
  color: var(--arm-grey-700);
  background: var(--arm-grey-50);
  border: 1px solid var(--arm-grey-200);
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
}

.result-item__details {
  display: none;
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--arm-grey-200);
}

.result-item.is-expanded .result-item__details {
  display: block;
}

.result-item__details[hidden] {
  display: none !important;
}

.detail-section {
  margin-top: 0.9rem;
}

.detail-section h4 {
  margin: 0 0 0.4rem;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--arm-grey-500);
}

.detail-url {
  font-size: 0.84rem;
  word-break: break-all;
}

.detail-url a {
  color: #1f4f8a;
}

.payload-block {
  margin: 0;
  padding: 0.75rem;
  background: var(--arm-grey-50);
  border: 1px solid var(--arm-grey-200);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 320px;
  overflow: auto;
}

.site-footer {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
  font-size: 0.78rem;
  color: var(--arm-grey-500);
  text-align: center;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.1rem;
  margin-bottom: 0.65rem;
}

.site-footer__links a {
  color: var(--arm-grey-700);
  text-decoration: none;
}

.site-footer__links a:hover {
  color: var(--arm-black);
  text-decoration: underline;
}

.site-footer code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--arm-grey-100);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
}

.empty-state,
.loading-state {
  grid-column: 1 / -1;
  padding: 2rem 1rem;
  text-align: center;
  color: var(--arm-grey-500);
  border: 1px dashed var(--arm-grey-200);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.7);
}

.error-state {
  grid-column: 1 / -1;
  padding: 1rem;
  border: 1px solid #e57373;
  background: #ffebee;
  border-radius: 8px;
  color: #b71c1c;
  font-size: 0.875rem;
}