/* ============================================================
   FrontierTech.news — "research lab that learned to design"
   Space Grotesk (display) + IBM Plex Sans (body)
   Accent: Electric Indigo #4F6EF7
   ============================================================ */

:root {
  --ink: #0B0D12;
  --ink-soft: #3A3F4B;
  --paper: #FAFAFB;
  --paper-raised: #FFFFFF;
  --line: #E4E6EC;
  --line-strong: #C9CCD6;
  --indigo: #4F6EF7;
  --indigo-deep: #2F45C9;
  --indigo-tint: #EEF1FE;

  --v-ai: #4F6EF7;       /* Artificial Intelligence */
  --v-ai-tint: #EEF1FE;
  --v-energy: #0F9D68;   /* Energy */
  --v-energy-tint: #E7F7EF;
  --v-biotech: #8B3DF0;  /* Biotech */
  --v-biotech-tint: #F4EBFE;
  --v-space: #0EA5D9;    /* Space */
  --v-space-tint: #E7F7FC;
  --v-blockchain: #C7860B; /* Blockchain */
  --v-blockchain-tint: #FBF1DD;
  --v-climate: #D9622B;   /* Climate & AgTech */
  --v-climate-tint: #FBEEE6;

  --radius-sm: 4px;
  --radius-md: 8px;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  --display: "Space Grotesk", "Arial Black", sans-serif;
  --body: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper-raised);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  font-family: var(--display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 2px;
}
.logo .dot { color: var(--indigo); }
.logo .tag {
  font-family: var(--mono), monospace;
  font-size: 10px;
  color: var(--ink-soft);
  letter-spacing: 0.14em;
  margin-left: 10px;
  border: 1px solid var(--line-strong);
  padding: 3px 6px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  font-weight: 500;
}
nav.primary-nav { display: flex; align-items: center; gap: 28px; }
nav.primary-nav a {
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
}
nav.primary-nav a:hover { color: var(--indigo); }
.btn-subscribe {
  background: var(--ink);
  color: #fff !important;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}
.btn-subscribe:hover { background: var(--indigo); }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-family: var(--mono);
  cursor: pointer;
}

@media (max-width: 780px) {
  nav.primary-nav {
    position: fixed;
    inset: 72px 0 0 0;
    background: var(--paper-raised);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 20px;
    transform: translateX(100%);
    transition: transform 0.2s ease;
    border-top: 1px solid var(--line);
  }
  nav.primary-nav.open { transform: translateX(0); }
  nav.primary-nav a { font-size: 18px; }
  .nav-toggle { display: block; }
}

/* ---------- Hero (asymmetric) ---------- */
.hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 48px;
  align-items: end;
}
.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--indigo);
  font-weight: 600;
  margin: 0 0 16px;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(40px, 6vw, 72px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}
.hero h1 em {
  font-style: normal;
  color: var(--indigo);
}
.hero p.dek {
  font-size: 19px;
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 0;
}
.hero-stat-card {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  padding: 28px;
  background: var(--paper-raised);
  position: relative;
  display: block;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.hero-stat-card:hover {
  border-color: var(--indigo);
  transform: translateY(-2px);
}
.hero-stat-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 5px;
  background: var(--indigo);
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}
.hero-stat-card .stat-kicker {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 600;
  margin-bottom: 14px;
}
.hero-stat-card .stat-num {
  font-family: var(--display);
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: block;
  color: var(--indigo);
}
.hero-stat-card .stat-label {
  font-size: 14px;
  color: var(--ink-soft);
  margin-top: 8px;
  display: block;
  line-height: 1.5;
}
.hero-stat-card .stat-cta {
  display: block;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}
.hero-stat-card:hover .stat-cta { color: var(--indigo); }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero { padding: 36px 0 28px; }
}

/* ---------- Vertical pill filter strip ---------- */
.pill-strip {
  display: flex;
  gap: 10px;
  padding: 20px 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}
.pill-strip::-webkit-scrollbar { display: none; }
.pill {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--paper-raised);
  color: var(--ink-soft);
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
  flex-shrink: 0;
}
.pill[data-v="all"].active,
.pill[data-v="all"]:hover { border-color: var(--ink); color: var(--ink); }
.pill[data-v="ai"].active, .pill[data-v="ai"]:hover { border-color: var(--v-ai); color: var(--v-ai); background: var(--v-ai-tint); }
.pill[data-v="energy"].active, .pill[data-v="energy"]:hover { border-color: var(--v-energy); color: var(--v-energy); background: var(--v-energy-tint); }
.pill[data-v="biotech"].active, .pill[data-v="biotech"]:hover { border-color: var(--v-biotech); color: var(--v-biotech); background: var(--v-biotech-tint); }
.pill[data-v="space"].active, .pill[data-v="space"]:hover { border-color: var(--v-space); color: var(--v-space); background: var(--v-space-tint); }
.pill[data-v="blockchain"].active, .pill[data-v="blockchain"]:hover { border-color: var(--v-blockchain); color: var(--v-blockchain); background: var(--v-blockchain-tint); }
.pill[data-v="climate"].active, .pill[data-v="climate"]:hover { border-color: var(--v-climate); color: var(--v-climate); background: var(--v-climate-tint); }

/* small badge used inline on article rows / article pages */
.badge {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  display: inline-block;
}
.badge.ai { color: var(--v-ai); background: var(--v-ai-tint); }
.badge.energy { color: var(--v-energy); background: var(--v-energy-tint); }
.badge.biotech { color: var(--v-biotech); background: var(--v-biotech-tint); }
.badge.space { color: var(--v-space); background: var(--v-space-tint); }
.badge.blockchain { color: var(--v-blockchain); background: var(--v-blockchain-tint); }
.badge.climate { color: var(--v-climate); background: var(--v-climate-tint); }

/* ---------- Numbered article list ---------- */
.article-list { padding: 12px 0 60px; }
.article-list h2.section-title,
h2.section-title {
  font-family: var(--display);
  font-size: 15px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 32px 0 16px;
  padding-top: 20px;
}
.article-row {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 20px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
}
.article-row:hover .article-row-title { color: var(--indigo); }
.article-row-num {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--line-strong);
  font-weight: 600;
}
.article-row-main { min-width: 0; }
.article-row-title {
  font-family: var(--display);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  line-height: 1.25;
}
.article-row-meta {
  font-size: 13px;
  color: var(--ink-soft);
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.article-row-meta .sep { color: var(--line-strong); }
.article-row-read {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
  white-space: nowrap;
  text-align: right;
}

@media (max-width: 640px) {
  .article-row { grid-template-columns: 32px 1fr; }
  .article-row-read { grid-column: 2; text-align: left; }
  .article-row-title { font-size: 19px; }
}

/* ---------- Article page ---------- */
.breadcrumb {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-soft);
  text-decoration: none;
  display: inline-block;
  margin: 28px 0 20px;
}
.breadcrumb:hover { color: var(--indigo); }

article.post { padding-bottom: 60px; }
.post-header { max-width: 780px; margin: 0 auto 32px; text-align: left; }
.post-header h1 {
  font-family: var(--display);
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
}
.post-dek { font-size: 19px; color: var(--ink-soft); margin: 0 0 20px; max-width: 62ch; }
.post-meta {
  font-size: 13px;
  color: var(--ink-soft);
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}
.post-hero-img {
  max-width: 940px;
  max-height: 340px;
  margin: 0 auto 8px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
}
.post-hero-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}
@media (max-width: 640px) {
  .post-hero-img { max-height: 200px; }
}
.post-hero-caption {
  max-width: 940px;
  margin: 0 auto 40px;
  font-size: 12px;
  color: var(--ink-soft);
  font-family: var(--mono);
}
.post-body {
  max-width: 700px;
  margin: 0 auto;
  font-size: 18px;
  line-height: 1.75;
}
.post-body p { margin: 0 0 24px; }
.post-body h2 {
  font-family: var(--display);
  font-size: 28px;
  letter-spacing: -0.01em;
  margin: 44px 0 18px;
}
.post-body h3 {
  font-family: var(--display);
  font-size: 21px;
  margin: 32px 0 12px;
}
.post-body blockquote {
  margin: 32px 0;
  padding-left: 22px;
  border-left: 3px solid var(--indigo);
  font-size: 21px;
  font-family: var(--display);
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.post-body ul, .post-body ol { padding-left: 22px; margin: 0 0 24px; }
.post-body li { margin-bottom: 10px; }
.post-body strong { font-weight: 600; }

.go-deeper {
  max-width: 700px;
  margin: 36px auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  background: var(--paper-raised);
}
.go-deeper .gd-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--indigo);
  font-weight: 700;
  margin: 0 0 12px;
}
.go-deeper ul { list-style: none; margin: 0; padding: 0; }
.go-deeper li { margin-bottom: 10px; font-size: 15px; }
.go-deeper a { text-decoration: underline; text-decoration-color: var(--line-strong); }
.go-deeper a:hover { color: var(--indigo); }

.faq { max-width: 700px; margin: 48px auto; }
.faq h2 { font-family: var(--display); font-size: 24px; margin-bottom: 18px; }
.faq-item { border-bottom: 1px solid var(--line); padding: 18px 0; }
.faq-item h3 { font-family: var(--body); font-size: 17px; font-weight: 600; margin: 0 0 8px; }
.faq-item p { margin: 0; color: var(--ink-soft); font-size: 15px; }

.related { border-top: 1px solid var(--line); padding: 40px 0; }
.related h2.section-title { margin-top: 0; padding-top: 0; }

/* ---------- Newsletter strip ---------- */
.newsletter {
  background: var(--ink);
  color: #fff;
  padding: 44px 0;
}
.newsletter .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.newsletter h3 {
  font-family: var(--display);
  font-size: 24px;
  margin: 0 0 6px;
}
.newsletter p { margin: 0; color: #B7BCCB; font-size: 14px; }
.newsletter-form { display: flex; gap: 10px; flex-wrap: wrap; }
.newsletter-form input[type="email"] {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid #3A3F4B;
  background: #171A22;
  color: #fff;
  font-size: 14px;
  min-width: 220px;
}
.newsletter-form button {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--indigo);
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
}
.newsletter-form button:hover { background: #6A85FF; }

/* ---------- Footer ---------- */
footer.site-footer {
  padding: 48px 0 28px;
  border-top: 1px solid var(--line);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 36px;
}
.footer-col h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 14px;
}
.footer-col a {
  display: block;
  text-decoration: none;
  color: var(--ink);
  font-size: 14px;
  margin-bottom: 10px;
}
.footer-col a:hover { color: var(--indigo); }
.footer-col p { font-size: 14px; color: var(--ink-soft); max-width: 32ch; margin: 0; }
.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  color: var(--ink-soft);
}
@media (max-width: 780px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- Utility pages (about etc.) ---------- */
.page-body {
  max-width: 700px;
  margin: 40px auto 80px;
  font-size: 17px;
  line-height: 1.75;
}
.page-body h1 { font-family: var(--display); font-size: 40px; margin-bottom: 20px; }
.page-body h2 { font-family: var(--display); font-size: 24px; margin: 36px 0 14px; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus { left: 16px; top: 16px; }