:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-strong: #edf7f6;
  --text: #151922;
  --muted: #586174;
  --line: #d8e0ea;
  --accent: #0f766e;
  --accent-dark: #0b5e59;
  --shadow: 0 18px 48px rgba(22, 32, 48, 0.08);
  --radius: 8px;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f9fbff 0%, #eef4f8 100%);
  line-height: 1.65;
}

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

img {
  max-width: 100%;
}

.container {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: rgba(249, 251, 255, 0.9);
  border-bottom: 1px solid rgba(216, 224, 234, 0.8);
}

.site-header .container,
.site-nav,
.hero-actions,
.footer-grid,
.contact-list,
.breadcrumb {
  display: flex;
  gap: 1rem;
}

.site-header .container {
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0;
}

.brand::before {
  content: "";
  width: 2rem;
  height: 2rem;
  flex: 0 0 auto;
  border-radius: 8px;
  background: url("/assets/topiapps-icon.svg") center / contain no-repeat;
}

.site-nav a,
.site-footer a {
  color: var(--muted);
}

.site-nav a:hover,
.site-footer a:hover,
.article-card a:hover,
.article-list-item a:hover {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  padding: 0.2rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px 0;
  background: var(--text);
}

.hero,
.section,
.page-hero {
  padding: 4.5rem 0;
}

.hero-grid,
.callout,
.page-layout {
  display: grid;
  gap: 2rem;
}

.hero-grid {
  grid-template-columns: 1.3fr 0.8fr;
  align-items: center;
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  line-height: 1.1;
  margin-top: 0;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.7rem);
  margin-bottom: 1rem;
  max-width: 13ch;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.lead,
.section-heading p,
.article-card p,
.info-card p,
.page-intro,
.copy-block p,
.callout p,
.feature-card li,
.contact-card p {
  color: var(--muted);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.8rem 1.2rem;
  border-radius: var(--radius);
  font-weight: 700;
  transition: transform 180ms ease, background-color 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--accent);
  color: #fff;
}

.button.primary:hover {
  background: var(--accent-dark);
}

.button.secondary {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.5);
}

.feature-card,
.info-card,
.article-card,
.callout,
.contact-card,
.copy-block,
.article-list-item {
  background: var(--surface);
  border: 1px solid rgba(216, 224, 234, 0.9);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.feature-card,
.callout,
.copy-block,
.contact-card {
  padding: 1.7rem;
}

.feature-card ul,
.copy-block ul {
  padding-left: 1.2rem;
  margin-bottom: 0;
}

.hero-media {
  overflow: hidden;
  border: 1px solid rgba(216, 224, 234, 0.9);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background: var(--surface);
}

.hero-media img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.media-card {
  overflow: hidden;
  padding: 0;
}

.media-card img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.media-card h2,
.media-card ul {
  margin-left: 1.7rem;
  margin-right: 1.7rem;
}

.media-card ul {
  margin-bottom: 1.7rem;
}

.section-soft {
  background: linear-gradient(180deg, rgba(237, 247, 246, 0.9), rgba(255, 255, 255, 0.35));
  border-top: 1px solid rgba(216, 224, 234, 0.85);
  border-bottom: 1px solid rgba(216, 224, 234, 0.85);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 2rem;
}

.card-grid,
.article-grid,
.article-list {
  display: grid;
  gap: 1.4rem;
}

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

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

.article-tools {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: end;
  margin-bottom: 1.4rem;
}

.search-field {
  display: grid;
  gap: 0.45rem;
  color: var(--muted);
  font-weight: 700;
}

.search-field input {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.8rem 1rem;
  color: var(--text);
  background: var(--surface);
  font: inherit;
  box-shadow: 0 10px 26px rgba(22, 32, 48, 0.05);
}

.search-field input:focus {
  outline: 2px solid rgba(15, 118, 110, 0.25);
  border-color: var(--accent);
}

.article-results {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
  white-space: nowrap;
}

.info-card,
.article-card,
.article-list-item {
  padding: 1.5rem;
}

.article-meta {
  color: var(--accent);
  text-transform: uppercase;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.article-list-item.is-hidden {
  display: none;
}

.pagination {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.55rem;
  margin-top: 1.7rem;
}

.pagination button {
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.pagination button:hover,
.pagination button.is-active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.pagination button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.callout {
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
}

.site-footer {
  padding: 2.5rem 0 3rem;
  border-top: 1px solid rgba(216, 224, 234, 0.85);
}

.footer-grid {
  justify-content: space-between;
  align-items: start;
}

.footer-grid div {
  display: grid;
  gap: 0.5rem;
  max-width: 300px;
}

.page-hero {
  padding-bottom: 2rem;
}

.breadcrumb {
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.page-layout {
  grid-template-columns: minmax(0, 2fr) minmax(280px, 0.9fr);
  align-items: start;
}

.article-list-item h3,
.copy-block h2 {
  margin-bottom: 0.6rem;
}

.article-list-item p:last-child,
.copy-block p:last-child,
.contact-card p:last-child {
  margin-bottom: 0;
}

.sidebar-stack {
  display: grid;
  gap: 1.2rem;
}

.contact-list {
  flex-direction: column;
  align-items: flex-start;
}

.contact-tag {
  display: inline-flex;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--accent-dark);
  font-size: 0.88rem;
  font-weight: 700;
}

.site-nav.is-open {
  display: flex;
}

@media (max-width: 920px) {
  .hero-grid,
  .callout,
  .page-layout,
  .card-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: none;
  }
}

@media (max-width: 760px) {
  .article-tools {
    grid-template-columns: 1fr;
  }

  .article-results {
    white-space: normal;
  }

  .site-nav {
    position: absolute;
    top: 76px;
    left: 1rem;
    right: 1rem;
    display: none;
    flex-direction: column;
    padding: 1rem;
    border-radius: var(--radius);
    background: rgba(255, 252, 247, 0.98);
    border: 1px solid rgba(216, 224, 234, 0.95);
    box-shadow: var(--shadow);
  }

  .nav-toggle {
    display: inline-block;
  }

  .hero,
  .section,
  .page-hero {
    padding: 3.2rem 0;
  }
}