/* ─── Custom Properties ──────────────────────────────────────────────────── */
:root {
  --bg-base:     #090b0e;
  --bg-surface:  #0d1017;
  --bg-elevated: #111520;
  --bg-code:     #0a0d13;

  --border:        #1c2235;
  --border-subtle: #131824;

  --accent:     #4a8cff;
  --accent-dim: rgba(74, 140, 255, 0.12);

  --green:     #3dd68c;
  --green-dim: rgba(61, 214, 140, 0.12);

  --text-primary:   #dde2ee;
  --text-secondary: #7a8499;
  --text-muted:     #3a4256;
  --text-code:      #a8b4d0;

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, 'Courier New', monospace;

  --radius:    6px;
  --radius-lg: 10px;
  --radius-xl: 14px;

  --shadow:    0 1px 3px rgba(0,0,0,0.5), 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 4px 32px rgba(0,0,0,0.6), 0 1px 2px rgba(0,0,0,0.4);

  --transition: 180ms ease;
  --max-w: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
code { font-family: var(--font-mono); font-size: 0.875em; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: #7aadff; }

/* ─── Focus ──────────────────────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ─── Layout ─────────────────────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

.section     { padding: 96px 0; }
.section-alt { background: var(--bg-surface); }

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 64px;
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.15;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.7;
}

/* ─── Navigation ─────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition), backdrop-filter var(--transition);
}

.nav.scrolled {
  background: rgba(9, 11, 14, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-color: var(--border-subtle);
}

.nav-inner {
  display: flex;
  align-items: center;
  height: 60px;
  gap: 32px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  flex-shrink: 0;
}
.nav-logo:hover { color: var(--text-primary); }
.nav-logo svg { color: var(--accent); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 28px;
  margin-left: auto;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.nav-links a:hover { color: var(--text-primary); }

/* ─── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
  line-height: 1;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { background: #6aa2ff; border-color: #6aa2ff; color: #fff; }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border);
}
.btn-ghost:hover { color: var(--text-primary); border-color: #2e3a52; }

.btn-sm  { font-size: 0.8125rem; padding: 6px 14px; }
.btn-lg  { font-size: 1rem; padding: 13px 26px; }

/* ─── Hero ───────────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  overflow: hidden;
  padding: 148px 0 80px;
}

/* subtle dot-grid background */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(74,140,255,0.18) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 20%, transparent 80%);
  pointer-events: none;
}

/* radial accent glow */
.hero::after {
  content: '';
  position: absolute;
  top: -160px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 600px;
  background: radial-gradient(ellipse at center, rgba(74,140,255,0.07) 0%, transparent 65%);
  pointer-events: none;
}

.hero-container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 56px;
  align-items: center;
}

.hero-code {
  grid-column: 1 / -1;
  margin-top: 24px;
  max-width: 760px;
  width: 100%;
  margin-left: auto;
  margin-right: auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 5px 14px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  flex-shrink: 0;
  animation: pulse 2.8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--green); }
  50%       { opacity: 0.4; box-shadow: 0 0 3px var(--green); }
}

.hero-headline {
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 22px;
}

.hero-sub {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 48px;
  margin-bottom: 36px;
}

.hero-image img {
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  width: 100%;
}

/* ─── Code Panels ────────────────────────────────────────────────────────── */
.code-panel {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.code-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

/* three fake window dots */
.code-panel-header::before {
  content: '';
  display: inline-block;
  width: 36px;
  height: 10px;
  border-radius: 5px;
  background:
    radial-gradient(circle 4px at 4px 5px,  #ff5f57 0%, #ff5f57 100%) no-repeat 0 0,
    radial-gradient(circle 4px at 18px 5px, #febc2e 0%, #febc2e 100%) no-repeat 14px 0,
    radial-gradient(circle 4px at 32px 5px, #28c840 0%, #28c840 100%) no-repeat 28px 0;
  opacity: 0.5;
  flex-shrink: 0;
}

.code-panel-title {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-secondary);
  margin-left: 10px;
}

.copy-btn {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 3px 9px;
  cursor: pointer;
  transition: all var(--transition);
  margin-left: auto;
}
.copy-btn:hover { color: var(--text-secondary); border-color: #2e3a52; }

.code-panel pre {
  padding: 20px 22px;
  overflow-x: auto;
}

.code-panel code {
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--text-code);
  white-space: pre;
}

/* ─── Credibility Strip ──────────────────────────────────────────────────── */
.strip {
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  padding: 52px 0;
  background: var(--bg-surface);
}

.strip-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.strip-item { text-align: center; }

.strip-item dt {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 5px;
  letter-spacing: -0.02em;
}
.strip-item dt code {
  font-size: 0.9em;
  color: var(--accent);
}

.strip-item dd {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.45;
}
.strip-item dd code { color: var(--text-secondary); font-size: 0.85em; }

/* ─── Architecture ───────────────────────────────────────────────────────── */
.arch-diagram {
  margin-bottom: 40px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}
.arch-diagram img { width: 100%; }

.arch-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.arch-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  transition: border-color var(--transition), transform var(--transition);
}
.arch-card:hover { border-color: rgba(74,140,255,0.4); transform: translateY(-2px); }

.arch-card-icon {
  font-size: 1.125rem;
  color: var(--accent);
  margin-bottom: 12px;
  font-family: var(--font-mono);
  line-height: 1;
}

.arch-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.arch-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}
.arch-card code { color: rgba(74,140,255,0.85); }

/* ─── Tabs ───────────────────────────────────────────────────────────────── */
.tabs { max-width: 820px; margin: 0 auto; }

.tab-list {
  display: flex;
  gap: 2px;
  padding: 4px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
}

.tab-btn {
  padding: 8px 20px;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition);
}
.tab-btn:hover   { color: var(--text-primary); }
.tab-btn.active  { background: var(--bg-code); color: var(--text-primary); }

.tab-panel .code-panel {
  border-radius: 0 var(--radius-lg) var(--radius-lg) var(--radius-lg);
}

/* ─── Integrations ───────────────────────────────────────────────────────── */
.integration-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.integration-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: border-color var(--transition), transform var(--transition);
}
.integration-card:hover { border-color: rgba(74,140,255,0.3); transform: translateY(-2px); }

.integration-logo {
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.integration-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(74,140,255,0.18);
  border-radius: 3px;
  padding: 2px 8px;
}

.integration-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ─── Evaluation ─────────────────────────────────────────────────────────── */
.eval-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.eval-feature {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  min-width: 0;
  transition: border-color var(--transition);
}
.eval-feature:hover { border-color: rgba(74,140,255,0.3); }

.eval-feature h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.eval-feature p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 18px;
}
.eval-feature p code { color: var(--text-code); }

.code-inline {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  overflow-x: auto;
}
.code-inline code {
  font-size: 0.7875rem;
  color: var(--text-code);
  white-space: nowrap;
}

/* ─── Security ───────────────────────────────────────────────────────────── */
.security-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px 40px;
}

.security-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.security-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--green-dim);
  border: 1px solid rgba(61,214,140,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--green);
  font-size: 0.625rem;
  margin-top: 2px;
}

.security-item h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.security-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}
.security-item code { color: var(--text-code); }

/* ─── CTA ────────────────────────────────────────────────────────────────── */
.cta-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
}

.cta-inner {
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.cta-inner h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}

.cta-inner > p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  margin-bottom: 32px;
  line-height: 1.65;
}
.cta-inner > p code { color: var(--text-code); }

.cta-code {
  margin-bottom: 32px;
  text-align: left;
}

.cta-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ─── Footer ─────────────────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.footer-nav {
  display: flex;
  gap: 24px;
}

.footer-nav a {
  font-size: 0.8125rem;
  color: var(--text-muted);
}
.footer-nav a:hover { color: var(--text-secondary); }

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-left: auto;
}

/* ─── Scroll Reveal ──────────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* stagger children inside card grids */
.arch-cards .arch-card:nth-child(2) { transition-delay: 60ms; }
.arch-cards .arch-card:nth-child(3) { transition-delay: 120ms; }
.arch-cards .arch-card:nth-child(4) { transition-delay: 180ms; }

.integration-grid .integration-card:nth-child(2) { transition-delay: 60ms; }
.integration-grid .integration-card:nth-child(3) { transition-delay: 120ms; }
.integration-grid .integration-card:nth-child(4) { transition-delay: 60ms; }
.integration-grid .integration-card:nth-child(5) { transition-delay: 120ms; }
.integration-grid .integration-card:nth-child(6) { transition-delay: 180ms; }

.strip-grid .strip-item:nth-child(2) { transition-delay: 50ms; }
.strip-grid .strip-item:nth-child(3) { transition-delay: 100ms; }
.strip-grid .strip-item:nth-child(4) { transition-delay: 150ms; }
.strip-grid .strip-item:nth-child(5) { transition-delay: 200ms; }

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .arch-cards { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .hero-container { grid-template-columns: 1fr; gap: 40px; }
  .hero-image { order: -1; max-width: 560px; margin: 0 auto; width: 100%; }
  .hero-headline { font-size: clamp(2rem, 6vw, 3rem); }
  .hero-sub { max-width: 100%; }
  .hero-code { margin-top: 8px; max-width: 100%; }
  .integration-grid { grid-template-columns: repeat(2, 1fr); }
  .security-grid { grid-template-columns: repeat(2, 1fr); }
  .strip-grid { grid-template-columns: repeat(3, 1fr); }
  .nav-links { display: none; }
}

@media (max-width: 640px) {
  .arch-cards      { grid-template-columns: 1fr; }
  .eval-grid       { grid-template-columns: 1fr; }
  .integration-grid{ grid-template-columns: 1fr; }
  .security-grid   { grid-template-columns: 1fr; }
  .strip-grid      { grid-template-columns: repeat(2, 1fr); }
  .hero            { padding: 110px 0 56px; }
  .section         { padding: 64px 0; }
  .container       { padding: 0 18px; }
  .footer-inner    { flex-direction: column; align-items: flex-start; gap: 16px; }
  .footer-copy     { margin-left: 0; }
  .tab-btn         { padding: 8px 14px; }
}