@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Playfair+Display:wght@400;700;900&family=Inter:wght@300;400;500&display=swap');

/* === RESET === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

/* === THEME VARIABLES === */
:root {
  --bg: #ffffff;
  --bg-subtle: #f8fafc;
  --fg: #1a1a2e;
  --fg-dim: #4a4a6a;
  --fg-faint: #8a8aa8;
  --accent: #2563eb;
  --accent-light: #3b82f6;
  --accent-pale: #dbeafe;
  --accent-bg: #eff6ff;
  --border: rgba(26, 26, 46, 0.12);
  --border-light: rgba(26, 26, 46, 0.06);
  --mono: 'Space Mono', monospace;
  --display: 'Playfair Display', Georgia, serif;
  --sans: 'Inter', system-ui, sans-serif;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: inherit; }

/* ============================================================
   BORDERED GRID FRAME SYSTEM (.g / .gc)
   Inspired by newspaper/editorial grid layouts.
   .g  = grid row (border-left, auto-columns)
   .gc = grid cell (border-top, border-right, padding)
   ============================================================ */

main {
  position: relative;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 32px;
}

/* Grid row */
.g {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  border-left: 1px solid var(--border);
  border-color: var(--border);
}

/* Auto-detect columns by child count */
.g:has(> .gc:nth-child(2)) { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g:has(> .gc:nth-child(3)) { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g:has(> .gc:nth-child(4)) { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.g:has(> .gc:nth-child(5)) { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.g:has(> .gc:nth-child(6)) { grid-template-columns: repeat(6, minmax(0, 1fr)); }

/* Grid cell */
.gc {
  border-top: 1px solid var(--border);
  border-right: 1px solid var(--border);
  padding: 16px;
  border-color: inherit;
}

/* Full-width cell (forces span all columns) */
.gc.col-full {
  grid-column: 1 / -1;
}

/* ============================================================
   NAVIGATION
   ============================================================ */

header.g {
  border-top: 1px solid var(--border);
  border-bottom: none;
}

.nav-brand {
  display: flex;
  align-items: center;
  padding: 12px 16px;
}

.nav-brand h2 {
  font-family: var(--sans);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.03em;
}

.nav-link {
  display: flex;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
  transition: color 0.2s;
  position: relative;
}

.nav-link:hover {
  color: var(--accent);
}

.nav-end {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.nav-end small {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
  padding: 48px 32px;
  text-align: center;
  display: flex;
  justify-content: center;
}

.hero-inner {
  max-width: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 32px 0;
}

.hero-badge {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.8;
}

.hero-title {
  font-family: var(--display);
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--fg);
}

.hero-sub {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--fg-dim);
  font-weight: 300;
  max-width: 520px;
}

/* Install commands */
.install {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.install-step { display: flex; flex-direction: column; gap: 4px; }

.install-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.install-head small {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

.cmd {
  border: 1px solid var(--border);
  background: var(--bg-subtle);
  padding: 8px 12px;
}

.cmd code {
  font-family: var(--mono);
  font-size: 0.6875rem;
  line-height: 1.6;
  word-break: break-all;
  color: var(--fg);
}

.cp {
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-faint);
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.2s;
  min-height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cp:hover { color: var(--accent); }

/* ============================================================
   SECTION LABELS
   ============================================================ */

.section-label {
  padding: 12px 16px;
}

.section-label small {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

/* ============================================================
   STATS / RESULTS
   ============================================================ */

.stat {
  padding: 24px 20px;
}

.stat-num {
  font-family: var(--display);
  font-size: 2.75rem;
  font-weight: 900;
  line-height: 1;
  margin-bottom: 8px;
  color: var(--accent);
}

.stat-label {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-dim);
  line-height: 1.5;
}

.stat-detail {
  font-size: 0.75rem;
  color: var(--fg-faint);
  margin-top: 6px;
  line-height: 1.5;
  font-weight: 300;
}

/* ============================================================
   KEY FINDING
   ============================================================ */

.finding {
  padding: 32px 24px;
}

.finding blockquote {
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 400;
  font-style: italic;
  line-height: 1.6;
  margin-bottom: 12px;
  color: var(--fg);
}

.finding-attr {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ============================================================
   TERMINAL DEMO
   ============================================================ */

#demo {
  grid-template-columns: 1fr 1fr !important;
}

.demo-terminal {
  background: #1e293b;
  padding: 0 !important;
  display: flex;
  flex-direction: column;
  height: 400px;
  min-height: 400px;
  max-height: 400px;
  overflow: hidden;
}

.term-head {
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 10px 16px;
  flex: 0 0 auto;
}

.term-dots {
  display: flex;
  gap: 6px;
}

.term-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-amber { background: #f5a623; }
.dot-green { background: #22c55e; }

.term-title {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.35);
}

#demo-pre {
  font-family: var(--mono);
  font-size: 0.6875rem;
  line-height: 1.9;
  color: #cbd5e1;
  white-space: pre-wrap;
  height: auto;
  min-height: 0;
  overflow: hidden;
  padding: 16px;
  flex: 1 1 auto;
}

#demo-pre .terminal-row {
  display: block;
  min-height: 1.30625rem;
}

#demo-pre .p { color: #f8fafc; font-weight: 700; }
#demo-pre .g { color: #4ade80; font-weight: 700; }
#demo-pre .d { color: #64748b; }

#demo-pre .cursor {
  display: inline-block;
  width: 7px;
  height: 14px;
  background: #94a3b8;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink { 50% { opacity: 0; } }

.demo-side {
  background: url('../assets/banner2.webp') center/cover no-repeat;
  position: relative;
  min-height: 400px;
  border-left: none !important;
}

.demo-side::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(37,99,235,0.04));
}

.demo-label {
  position: absolute;
  bottom: 16px;
  right: 20px;
  z-index: 2;
  font-family: var(--display);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #fff;
  opacity: 0.7;
  text-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

/* ============================================================
   FEATURES
   ============================================================ */

.feat-wrap {
  padding: 0 !important;
}

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

.feat-item {
  padding: 20px;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  position: relative;
  transition: background 0.15s;
}

.feat-item:hover {
  background: var(--bg-subtle);
}

.feat-item:nth-child(3n) {
  border-right: none;
}

.feat-item:nth-last-child(-n+3) {
  border-bottom: none;
}

.feat-title {
  display: block;
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 8px;
}

.feat-item p {
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--fg-dim);
  font-weight: 300;
}

.more-link {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  transition: opacity 0.2s;
}

.more-link:hover { opacity: 0.7; }

/* ============================================================
   ARCHITECTURE
   ============================================================ */

.arch-content {
  padding: 24px 20px 32px;
}

.arch-title {
  display: block;
  font-family: var(--display);
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  margin-bottom: 28px;
  color: var(--fg);
}

.arch-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
}

.arch-tab {
  font-family: var(--mono);
  padding: 12px 20px;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  color: var(--fg-faint);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  transition: all 0.25s;
  position: relative;
  bottom: -1px;
}

.arch-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.arch-tab:hover:not(.active) { color: var(--fg-dim); }

.arch-panel { display: none; padding: 32px 0; animation: fadeUp 0.3s ease; }
.arch-panel.active { display: block; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Architecture HTML diagrams ── */
.diagram {
  margin-bottom: 24px;
  padding: 24px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
}

.dia-row {
  display: flex;
  gap: 14px;
  align-items: stretch;
}

.dia-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.dia-box {
  border: 1px solid var(--border);
  padding: 12px 14px;
  background: var(--bg);
  position: relative;
}

.dia-box h5 {
  font-family: var(--mono);
  font-size: 0.5625rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 6px;
  line-height: 1;
}

.dia-box ul {
  list-style: none;
  font-family: var(--sans);
  font-size: 0.6875rem;
  color: var(--fg-dim);
  line-height: 1.6;
}

.dia-box .meta {
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 0.5rem;
  color: var(--fg-faint);
  letter-spacing: 0.04em;
}

/* Color accents via left border */
.dia-box.c-amber  { border-left: 3px solid #d97706; }
.dia-box.c-amber h5  { color: #d97706; }
.dia-box.c-blue   { border-left: 3px solid var(--accent); }
.dia-box.c-blue h5   { color: var(--accent); }
.dia-box.c-red    { border-left: 3px solid #dc2626; }
.dia-box.c-red h5    { color: #dc2626; }
.dia-box.c-green  { border-left: 3px solid #16a34a; }
.dia-box.c-green h5  { color: #16a34a; }
.dia-box.c-dark   { border-left: 3px solid var(--fg); }
.dia-box.c-dark h5   { color: var(--fg); }

.dia-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  gap: 4px;
  padding: 0 2px;
}

.dia-arrow .arr {
  font-size: 18px;
  color: var(--fg-faint);
  line-height: 1;
}

.dia-arrow .lbl {
  font-family: var(--mono);
  font-size: 0.5rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  white-space: nowrap;
}

.dia-bidi {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  gap: 6px;
  padding: 0 6px;
}

.dia-bidi-item {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--mono);
  font-size: 0.5rem;
  color: var(--fg-faint);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.dia-section {
  border: 1px solid var(--border);
  padding: 14px;
  background: var(--bg);
  flex: 1;
}

.dia-section-header {
  font-family: var(--mono);
  font-size: 0.5625rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.dia-section-header.c-amber  { color: #d97706; }
.dia-section-header.c-red    { color: #dc2626; }
.dia-section-header.c-green  { color: #16a34a; }
.dia-section-header.c-dark   { color: var(--fg); }

.dia-varrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 0;
  gap: 2px;
}

.dia-varrow .arr { font-size: 16px; color: var(--fg-faint); }
.dia-varrow .lbl {
  font-family: var(--mono);
  font-size: 0.5rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

.dia-callout {
  margin-top: 20px;
  padding: 16px 20px;
  background: var(--accent-bg);
  border-left: 3px solid var(--accent);
}

.dia-callout p {
  font-size: 0.8125rem;
  color: var(--fg-dim);
  line-height: 1.7;
  font-weight: 300;
}

.dia-callout strong { color: var(--accent); font-weight: 500; }

.dia-callout .tag {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 0.5rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.explain {
  font-size: 0.8125rem;
  color: var(--fg-dim);
  line-height: 1.75;
  max-width: 700px;
  font-weight: 300;
}

.explain strong { color: var(--fg); font-weight: 500; }

/* ── Architecture Overview diagram ── */
.arch-overview .arch-primary {
  display: grid;
  grid-template-columns: minmax(180px, 200px) minmax(0, 2fr) auto minmax(240px, 280px);
  gap: 12px;
  align-items: stretch;
}

.arch-io {
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: space-between;
}

.arch-io-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 6px 0;
}

.arch-io-flow .arr {
  font-size: 16px;
  color: var(--fg-faint);
  line-height: 1;
}

.arch-io-flow .lbl {
  font-family: var(--mono);
  font-size: 0.5rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  text-align: center;
  line-height: 1.4;
}

.arch-react,
.arch-docker {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.react-stage {
  display: flex;
  align-items: stretch;
  gap: 10px;
}

.react-stage > .dia-box {
  flex: 1;
}

.react-stage-back { flex-direction: row-reverse; }

.dia-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  padding: 0 4px;
}

.dia-flow .lbl {
  font-family: var(--mono);
  font-size: 0.5rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  white-space: nowrap;
}

.dia-box.decision {
  border-style: dashed;
}

.tag-yes,
.tag-no {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.5rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 1px 6px;
  border-radius: 2px;
  margin-right: 4px;
}

.tag-yes { color: #16a34a; background: rgba(22, 163, 74, 0.12); }
.tag-no  { color: #dc2626; background: rgba(220, 38, 38, 0.12); }

.obs-box { border-width: 2px; }

.obs-feedback {
  color: var(--accent);
  font-weight: 500;
}

.arch-bridge {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 18px;
  padding: 0 4px;
  min-width: 80px;
}

.arch-bridge-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.arch-bridge-row .arr {
  font-size: 18px;
  color: var(--fg-faint);
  line-height: 1;
}

.arch-bridge-row .lbl {
  font-family: var(--mono);
  font-size: 0.5rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  white-space: nowrap;
}

.arch-fs {
  border: 1px dashed var(--border);
  padding: 10px;
  background: var(--bg);
}

.arch-fs-label {
  font-family: var(--mono);
  font-size: 0.5625rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 8px;
}

.arch-fs-inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.arch-feedback-connector {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 16px auto 0;
  padding: 10px 16px;
  max-width: 520px;
  border: 1px solid var(--accent);
  border-left-width: 3px;
  background: var(--accent-bg);
}

.arch-feedback-connector .arr {
  font-size: 18px;
  color: var(--accent);
  line-height: 1;
  font-weight: 700;
}

.arch-feedback-connector .lbl {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.arch-feedback-connector em {
  font-style: normal;
  color: var(--fg-dim);
}

.arch-validation {
  margin-top: 12px;
}

.validation-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.validation-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}

.vlink {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.vlink .arr { color: var(--fg-faint); }
.vlink em { font-style: normal; color: var(--fg-faint); }

.vlink-feedback { color: var(--accent); font-weight: 500; }
.vlink-feedback .arr,
.vlink-feedback em { color: var(--accent); }

/* Responsive: stack primary grid on narrow viewports */
@media (max-width: 900px) {
  .arch-overview .arch-primary {
    grid-template-columns: 1fr;
  }
  .arch-bridge {
    flex-direction: row;
    justify-content: center;
    gap: 24px;
  }
  .react-stage,
  .react-stage-back {
    flex-direction: column;
  }
  .validation-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   TEAM
   ============================================================ */

.team-member {
  padding: 20px 16px;
}

.team-member h4 {
  font-family: var(--display);
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--fg);
}

.team-member .aff {
  font-size: 0.75rem;
  color: var(--fg-dim);
  font-weight: 300;
  margin-bottom: 8px;
}

.team-member .gs {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

.team-member .gs:hover { color: var(--fg); }

.team-member.highlight h4 { color: var(--accent); font-weight: 900; }

.team-member.highlight .role {
  font-family: var(--mono);
  font-size: 0.5625rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 8px;
}

/* ============================================================
   CITATION
   ============================================================ */

.cite-content {
  padding: 24px 20px 32px;
}

.cite-title {
  font-family: var(--display);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--fg);
}

.cite-meta {
  font-size: 0.8125rem;
  color: var(--fg-dim);
  font-weight: 300;
  margin-bottom: 4px;
}

.cite-venue {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--fg-faint);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.cite-doi {
  font-size: 0.8125rem;
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.2s;
}

.cite-doi:hover { opacity: 0.7; }

.bibtex {
  margin-top: 20px;
  padding: 16px 20px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--fg-dim);
  line-height: 1.8;
  position: relative;
}

.bibtex .cp {
  position: absolute;
  top: 8px;
  right: 12px;
}

/* ============================================================
   FOOTER
   ============================================================ */

.footer {
  border-bottom: 1px solid var(--border);
}

.footer .gc {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer small {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

.footer .version {
  color: var(--accent);
}

.footer a {
  transition: opacity 0.2s;
}

.footer a:hover { opacity: 0.7; }

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 900px) {
  main { padding: 0 16px; }

  .g:has(> .gc:nth-child(5)),
  .g:has(> .gc:nth-child(6)) {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .feat-item:nth-child(3n) { border-right: 1px solid var(--border); }
  .feat-item:nth-child(2n) { border-right: none; }
  .feat-item:nth-last-child(-n+3) { border-bottom: 1px solid var(--border); }
  .feat-item:nth-last-child(-n+2) { border-bottom: none; }

  #demo {
    grid-template-columns: 1fr !important;
  }

  .demo-side {
    min-height: 200px;
  }

  .hero-title {
    font-size: 2.5rem;
  }
}

@media (max-width: 640px) {
  .g {
    grid-template-columns: 1fr !important;
  }

  .feat-grid {
    grid-template-columns: 1fr;
  }

  .feat-item { border-right: none !important; }
  .feat-item:last-child { border-bottom: none; }

  .hero-title {
    font-size: 2rem;
  }

  .stat-num {
    font-size: 2rem;
  }

  .dia-row {
    flex-direction: column;
  }

  .dia-arrow {
    flex-direction: row;
    padding: 4px 0;
  }
}