/* =========================================================================
   SysML Studio - Landing page styles
   Hand-written, no framework. Dark theme (carbon) by default, single-file.
   ========================================================================= */

:root {
  /* Palette - carbon with a warmer cyan/violet duet. Kept quiet and dark. */
  --bg-0: #07080a;
  --bg-1: #0b0c0f;
  --bg-2: #101116;
  --bg-3: #171922;
  --surface: #0f1014;
  --surface-2: #15161c;
  --border: #20222b;
  --border-strong: #2c2f3a;

  --text-1: #eceef3;
  --text-2: #b3b7c2;
  --text-3: #868a97;
  --text-4: #555966;

  --accent:      #6ea8ff;   /* primary azure */
  --accent-2:    #9ec2ff;
  --accent-dim:  #16223d;
  --accent-glow: rgba(110, 168, 255, 0.22);

  --violet:      #a78bfa;
  --cyan:        #67e8f9;
  --mint:        #5eead4;

  --ok: #34d399;
  --warn: #fbbf24;
  --danger: #f87171;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.5);
  --shadow: 0 6px 28px rgba(0,0,0,0.45);
  --shadow-lg: 0 24px 80px -12px rgba(0,0,0,0.7), 0 0 0 1px rgba(110,168,255,0.05);

  /* Typography - system stack but with display + mono variants.
     Serious display face via ui-serif/system fallback + custom weights. */
  --font-sans: "InterVariable", "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "InterVariable", "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --container: 1180px;
  --header-h: 64px;

  --ease-out: cubic-bezier(.22,.61,.36,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);

  color-scheme: dark;
}

/* =========================================================================
   Reset / base
   ========================================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 8px);
}

body {
  margin: 0;
  background: var(--bg-0);
  color: var(--text-1);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  font-feature-settings: "cv11", "ss01", "ss03", "cv02";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
}

/* Ambient page background: dot grid + subtle vignette + grain noise.
   Fixed so it feels like a layer behind all content. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(255,255,255,0.045) 1px, transparent 1px),
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(110,168,255,0.06), transparent 60%);
  background-size: 28px 28px, 100% 100%;
  mask-image: radial-gradient(ellipse 100% 80% at 50% 20%, #000 40%, transparent 90%);
  -webkit-mask-image: radial-gradient(ellipse 100% 80% at 50% 20%, #000 40%, transparent 90%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='140' height='140'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 0.8 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

.site-header, main, .site-footer { position: relative; z-index: 1; }

img, svg { display: block; max-width: 100%; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--accent-2); }

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--text-1);
  text-wrap: balance;
}

p { margin: 0; }

ul { margin: 0; padding: 0; list-style: none; }

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-2);
  padding: 0.12em 0.38em;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--accent-2);
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

/* Accessibility - skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  background: var(--accent);
  color: #07101f;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 1000;
}
.skip-link:focus { left: 12px; }

/* Scroll progress bar - thin accent line at the top of the viewport
   that fills as the user scrolls. Width is set inline by JS via
   scaleX transform so updates are GPU-cheap on every scroll event. */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 1100;
  pointer-events: none;
  background: transparent;
}
.scroll-progress > span {
  display: block;
  height: 100%;
  width: 100%;
  transform-origin: 0 50%;
  transform: scaleX(var(--p, 0));
  background: linear-gradient(90deg, #6ea8ff 0%, #a78bfa 50%, #67e8f9 100%);
  box-shadow: 0 0 12px rgba(110, 168, 255, 0.45);
  transition: transform 0.08s linear;
}

/* =========================================================================
   Layout helpers
   ========================================================================= */

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
  position: relative;
}
.section-muted { background: var(--bg-1); }

.section-head {
  max-width: 680px;
  margin-bottom: 56px;
}
.section-head-center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}
.section-head h2 {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: 16px;
}
.section-lede {
  color: var(--text-2);
  font-size: 17px;
  line-height: 1.6;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 14px;
}

.dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-3);
}
.dot-ok   { background: var(--ok);    box-shadow: 0 0 8px rgba(34,197,94,0.55); }
.dot-warn { background: var(--warn);  box-shadow: 0 0 8px rgba(245,158,11,0.55); }
/* Generic green-ok pulse for status dots (footer, hero eyebrow). */
.dot-pulse { animation: dot-pulse 2.4s ease-in-out infinite; }
@keyframes dot-pulse {
  0%, 100% { box-shadow: 0 0 8px rgba(52,211,153,0.55), 0 0 0 0 rgba(52,211,153,0.55); }
  50%      { box-shadow: 0 0 8px rgba(52,211,153,0.55), 0 0 0 6px rgba(52,211,153,0); }
}
@media (prefers-reduced-motion: reduce) { .dot-pulse { animation: none; } }

.accent-text {
  background: linear-gradient(100deg, #9ec2ff 0%, #a78bfa 50%, #67e8f9 100%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: text-sheen 9s ease-in-out infinite alternate;
}
@keyframes text-sheen {
  from { background-position: 0% 50%; }
  to   { background-position: 100% 50%; }
}

/* =========================================================================
   Buttons
   ========================================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  border: 1px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease, color 0.15s ease;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  position: relative;
  background: linear-gradient(180deg, #85b6ff 0%, #5e9bf5 100%);
  color: #07101f;
  border-color: rgba(255,255,255,0.1);
  box-shadow: 0 1px 0 rgba(255,255,255,0.25) inset, 0 8px 24px -8px rgba(110,168,255,0.6), 0 0 0 1px rgba(110,168,255,0.3);
  overflow: hidden;
}
.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.35) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.7s var(--ease-out);
  pointer-events: none;
}
.btn-primary:hover::before { transform: translateX(120%); }
.btn-primary:hover { color: #07101f; border-color: rgba(255,255,255,0.2); transform: translateY(-1px); box-shadow: 0 1px 0 rgba(255,255,255,0.3) inset, 0 12px 32px -8px rgba(110,168,255,0.75), 0 0 0 1px rgba(110,168,255,0.45); }

.btn-secondary {
  background: var(--surface);
  color: var(--text-1);
  border-color: var(--border-strong);
}
.btn-secondary:hover { background: var(--surface-2); border-color: var(--text-4); color: var(--text-1); }

.btn-ghost {
  background: transparent;
  color: var(--text-1);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--surface); border-color: var(--border-strong); color: var(--text-1); }

.btn-lg {
  padding: 13px 22px;
  font-size: 15px;
  border-radius: 10px;
}
.btn-block { display: flex; width: 100%; }

/* =========================================================================
   Header
   ========================================================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(10, 10, 11, 0.78);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-1);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--text-1); }
.brand-mark { color: var(--accent); }
.brand-name { font-size: 15.5px; }
.brand-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--accent-2);
  letter-spacing: 0.06em;
}

.site-nav {
  display: flex;
  gap: 24px;
  margin-left: 12px;
}
.site-nav a {
  color: var(--text-2);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 2px;
}
.site-nav a:hover { color: var(--text-1); }

.header-cta {
  margin-left: auto;
  display: flex;
  gap: 10px;
  align-items: center;
}

.menu-toggle {
  display: none;
  padding: 8px;
  border-radius: var(--radius-sm);
  color: var(--text-1);
  border: 1px solid var(--border);
}
.menu-toggle:hover { background: var(--surface); }

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 24px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-1);
}
.mobile-nav[hidden] { display: none; }
.mobile-nav a {
  color: var(--text-1);
  padding: 12px 4px;
  border-bottom: 1px solid var(--border);
  font-weight: 500;
}
.mobile-nav a.btn { margin-top: 12px; justify-content: center; border-bottom: 0; }

/* =========================================================================
   Hero
   ========================================================================= */

.hero {
  position: relative;
  padding: 88px 0 96px;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 520px;
  background:
    radial-gradient(ellipse 60% 55% at 30% 30%, rgba(96, 165, 250, 0.18), transparent 60%),
    radial-gradient(ellipse 50% 45% at 75% 40%, rgba(167, 139, 250, 0.14), transparent 60%);
  pointer-events: none;
  z-index: 0;
  filter: blur(12px);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 64px;
  align-items: center;
}

.hero-title {
  font-size: clamp(36px, 5.6vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  margin-bottom: 20px;
}

.hero-sub {
  color: var(--text-2);
  font-size: 18px;
  line-height: 1.6;
  max-width: 560px;
  margin-bottom: 28px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--text-3);
  font-size: 13px;
}
.hero-meta li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  opacity: 0;
  transform: translateY(4px);
  animation: hero-meta-in 0.6s var(--ease-out) both;
}
.hero-meta li:nth-child(1) { animation-delay: 0.55s; }
.hero-meta li:nth-child(2) { animation-delay: 0.7s; }
.hero-meta li:nth-child(3) { animation-delay: 0.85s; }
.hero-meta svg { color: var(--ok); }
@keyframes hero-meta-in {
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-meta li { opacity: 1; transform: none; animation: none; }
}

/* Hero canvas preview */
.hero-canvas {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
/* Hero diagram tab switcher */
.canvas-tabs {
  display: inline-flex;
  gap: 2px;
  margin-left: 12px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 2px;
}
.canvas-tab {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-3);
  background: transparent;
  border: none;
  border-radius: 5px;
  padding: 3px 9px;
  cursor: pointer;
  transition: color 0.18s ease, background 0.18s ease;
  line-height: 1.2;
}
.canvas-tab:hover { color: var(--text-2); background: var(--surface-2); }
.canvas-tab.is-active { color: var(--accent-2); background: var(--accent-dim); }

/* Auto-cycle progress bar - only renders when JS adds .auto-cycling.
   Hidden by default so static / reduced-motion users see a clean tab. */
.canvas-tab { position: relative; overflow: hidden; }
.canvas-tab.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0;
  background: var(--accent);
  opacity: 0;
}
.hero-canvas.auto-cycling .canvas-tab.is-active::after {
  opacity: 0.85;
  animation: tab-progress 4500ms linear forwards;
}
.hero-canvas.auto-cycling:hover .canvas-tab.is-active::after,
.hero-canvas.auto-cycling:focus-within .canvas-tab.is-active::after {
  animation-play-state: paused;
}
@keyframes tab-progress {
  from { width: 0; }
  to   { width: 100%; }
}

/* Multiple diagram panes - only active one visible.
   Each activation re-runs the per-element entrance animations
   (display:none → block restarts CSS animations). */
.canvas-panel {
  display: none;
  width: 100%;
}
.canvas-panel.is-active {
  display: block;
  animation: panel-enter 0.42s var(--ease-out) both;
}
@keyframes panel-enter {
  from { opacity: 0; transform: scale(0.985); }
  to   { opacity: 1; transform: scale(1); }
}

/* Cursors overlay - floats on top of every panel so the four collaborators
   keep drifting regardless of which diagram is on screen. The active panel
   below sets the height; this SVG matches it via the same viewBox + absolute
   inset, with no own background and no parallax (panels do that themselves). */
.hero-canvas { position: relative; }
.canvas-cursors {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  background: transparent !important;
  transform: none !important;
  pointer-events: none;
  /* The chrome bar sits above the panels in flow; offset cursors below it.
     Chrome is ~38px (10px+11px+10px padding + content); use top: 38px so the
     overlay only covers the panel area, not the chrome. */
  top: 38px;
  height: calc(100% - 38px);
}

/* Sequence diagram node entrance animation */
.canvas-svg .seq-node {
  opacity: 0;
  transform: translateY(5px);
  transform-origin: center;
  animation: node-pop 0.5s ease-out forwards;
}
.canvas-svg .seq-node:nth-child(1) { animation-delay: 0.1s; }
.canvas-svg .seq-node:nth-child(2) { animation-delay: 0.25s; }
.canvas-svg .seq-node:nth-child(3) { animation-delay: 0.4s; }
.canvas-svg .seq-line {
  stroke-dasharray: 300;
  stroke-dashoffset: 300;
  animation: edge-draw 0.6s ease-out 0.5s forwards;
}
.canvas-svg .seq-msg {
  opacity: 0;
  animation: node-pop 0.4s ease-out forwards;
}
.canvas-svg .seq-msg:nth-child(1) { animation-delay: 0.7s; }
.canvas-svg .seq-msg:nth-child(2) { animation-delay: 0.9s; }
.canvas-svg .seq-msg:nth-child(3) { animation-delay: 1.1s; }
.canvas-svg .seq-msg:nth-child(4) { animation-delay: 1.3s; }
.canvas-svg .seq-frag {
  opacity: 0;
  animation: node-pop 0.4s ease-out 1.5s forwards;
}

/* REQ diagram animations */
.canvas-svg .req-node {
  opacity: 0;
  transform: translateY(6px);
  transform-origin: center;
  animation: node-pop 0.5s ease-out forwards;
}
.canvas-svg .req-node:nth-child(1) { animation-delay: 0.15s; }
.canvas-svg .req-node:nth-child(2) { animation-delay: 0.40s; }
.canvas-svg .req-node:nth-child(3) { animation-delay: 0.65s; }
.canvas-svg .req-edge {
  stroke-dasharray: 250;
  stroke-dashoffset: 250;
  animation: edge-draw 0.7s ease-out forwards;
}
.canvas-svg .req-edge-1 { animation-delay: 0.85s; }
.canvas-svg .req-edge-2 { animation-delay: 1.05s; }
.canvas-svg .req-label {
  opacity: 0;
  animation: node-pop 0.3s ease-out forwards;
}
.canvas-svg .req-label-1 { animation-delay: 1.0s; }
.canvas-svg .req-label-2 { animation-delay: 1.2s; }

/* =========================================================================
   How it works - 3-step workflow strip
   ========================================================================= */
.how-steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0 16px;
  align-items: start;
  margin-top: 48px;
}
.how-step {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.how-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--accent-dim);
  border: 1px solid rgba(110,168,255,0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  transition:
    transform 0.45s var(--ease-spring),
    background 0.25s ease,
    border-color 0.25s ease,
    color 0.25s ease,
    box-shadow 0.3s ease;
}
.how-step:hover .how-icon {
  transform: scale(1.08) rotate(-4deg);
  background: color-mix(in srgb, var(--accent) 24%, var(--accent-dim));
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
  color: var(--accent-2);
  box-shadow: 0 0 24px -4px var(--accent-glow);
}
.how-step h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-1);
  margin: 0;
}
.how-step p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.6;
  margin: 0;
}
.how-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--text-4);
  padding-top: 12px;
  font-weight: 300;
}

.canvas-chrome {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
}
.canvas-chrome .dot {
  width: 11px;
  height: 11px;
  background: var(--border-strong);
}
.canvas-chrome .dot:nth-child(1) { background: #ef4444; }
.canvas-chrome .dot:nth-child(2) { background: #f59e0b; }
.canvas-chrome .dot:nth-child(3) { background: #22c55e; }
.canvas-label {
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-3);
}
.canvas-svg {
  display: block;
  width: 100%;
  height: auto;
  background: var(--bg-1);
  /* Parallax offset driven by JS via custom props on .hero-canvas */
  transition: transform 0.4s var(--ease-out);
  transform: translate3d(calc(var(--px, 0) * 6px), calc(var(--py, 0) * 4px), 0);
}

/* Keybinding pills floating in the canvas chrome (right side) */
.canvas-keys {
  margin-left: auto;
  display: inline-flex;
  gap: 6px;
}
.canvas-keys kbd {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 2px 6px;
  line-height: 1.2;
  box-shadow: 0 1px 0 rgba(0,0,0,0.4);
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s var(--ease-spring);
  opacity: 0;
  animation: key-fade-in 0.5s ease-out forwards;
}
.canvas-keys kbd:nth-child(1) { animation-delay: 1.0s; }
.canvas-keys kbd:nth-child(2) { animation-delay: 1.15s; }
.canvas-keys kbd:nth-child(3) { animation-delay: 1.30s; }
.hero-canvas:hover .canvas-keys kbd {
  color: var(--accent-2);
  border-color: var(--border-strong);
}
@keyframes key-fade-in {
  from { opacity: 0; transform: translateY(-3px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Ping pulses emanating from each collaborator cursor */
.canvas-svg .ping {
  transform-origin: center;
  transform-box: fill-box;
  opacity: 0;
}
.canvas-svg .ping-pablo  { animation: ping-out 3.4s ease-out 3.0s infinite; }
.canvas-svg .ping-eric-b { animation: ping-out 3.4s ease-out 4.4s infinite; }
.canvas-svg .ping-eric-l { animation: ping-out 3.4s ease-out 5.8s infinite; }
.canvas-svg .ping-jp     { animation: ping-out 3.4s ease-out 7.2s infinite; }
@keyframes ping-out {
  0%   { opacity: 0;   transform: scale(0.4); }
  20%  { opacity: 0.7; }
  100% { opacity: 0;   transform: scale(2.6); }
}

/* Canvas animations (block pop + collab cursor drift) */
.canvas-svg .node {
  opacity: 0;
  transform: translateY(6px);
  transform-origin: center;
  animation: node-pop 0.6s ease-out forwards;
}
.canvas-svg .node-1 { animation-delay: 0.15s; }
.canvas-svg .node-2 { animation-delay: 0.45s; }
.canvas-svg .node-3 { animation-delay: 0.65s; }

.canvas-svg .edge {
  stroke-dasharray: 320;
  stroke-dashoffset: 320;
  animation: edge-draw 0.7s ease-out forwards;
}
.canvas-svg .edge-1 { animation-delay: 0.55s; }
.canvas-svg .edge-2 { animation-delay: 0.8s; }

.canvas-svg .cursor {
  opacity: 0;
  animation: cursor-fade 0.4s ease-out forwards;
}
.canvas-svg .cursor-pablo {
  animation: cursor-fade 0.4s ease-out 1.4s forwards,
             cursor-drift-pablo 5.2s ease-in-out 1.8s infinite alternate;
  transform: translate(90px, 96px);
}
.canvas-svg .cursor-eric-b {
  animation: cursor-fade 0.4s ease-out 1.6s forwards,
             cursor-drift-eric-b 6.1s ease-in-out 2.0s infinite alternate;
  transform: translate(350px, 92px);
}
.canvas-svg .cursor-eric-l {
  animation: cursor-fade 0.4s ease-out 2.0s forwards,
             cursor-drift-eric-l 5.8s ease-in-out 2.4s infinite alternate;
  transform: translate(40px, 200px);
}
.canvas-svg .cursor-jp {
  animation: cursor-fade 0.4s ease-out 1.8s forwards,
             cursor-drift-jp 4.7s ease-in-out 2.2s infinite alternate;
  transform: translate(210px, 215px);
}

@keyframes node-pop {
  from { opacity: 0; transform: translateY(6px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes edge-draw {
  to { stroke-dashoffset: 0; }
}
@keyframes cursor-fade {
  to { opacity: 1; }
}
@keyframes cursor-drift-pablo {
  from { transform: translate(90px, 96px); }
  to   { transform: translate(170px, 172px); }
}
@keyframes cursor-drift-eric-b {
  from { transform: translate(350px, 92px); }
  to   { transform: translate(282px, 186px); }
}
@keyframes cursor-drift-eric-l {
  from { transform: translate(40px, 200px); }
  to   { transform: translate(128px, 118px); }
}
@keyframes cursor-drift-jp {
  from { transform: translate(210px, 215px); }
  to   { transform: translate(298px, 98px); }
}

@media (prefers-reduced-motion: reduce) {
  .canvas-svg .cursor-pablo,
  .canvas-svg .cursor-eric-b,
  .canvas-svg .cursor-eric-l,
  .canvas-svg .cursor-jp {
    animation: cursor-fade 0.4s ease-out forwards;
  }
  .canvas-svg .ping { animation: none; opacity: 0; }
  .canvas-svg { transition: none; transform: none; }
  .canvas-keys kbd { animation: none; opacity: 1; }
}

/* =========================================================================
   Cards (capabilities)
   ========================================================================= */

.card-grid {
  display: grid;
  gap: 18px;
}
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}
.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  background: var(--surface-2);
}
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
  color: var(--accent-2);
  margin-bottom: 14px;
}
.card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}
.card p {
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.55;
}

/* =========================================================================
   Diagram grid
   ========================================================================= */

/* =========================================================================
   Diagram cards - mini interactive previews of each diagram type
   ========================================================================= */
.diagram-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  perspective: 1200px;
}
.diagram-card {
  --accent-c: var(--accent);
  position: relative;
  display: flex;
  flex-direction: column;
  background:
    linear-gradient(180deg, var(--surface) 0%, var(--bg-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transform-style: preserve-3d;
  transition:
    transform 0.4s var(--ease-out),
    border-color 0.25s ease,
    box-shadow 0.3s ease;
  will-change: transform;
}
.diagram-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(
    400px circle at var(--mx, 50%) var(--my, 0%),
    color-mix(in srgb, var(--accent-c) 18%, transparent),
    transparent 50%
  );
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 1;
}
.diagram-card:hover {
  border-color: color-mix(in srgb, var(--accent-c) 60%, var(--border));
  transform: translateY(-3px) rotateX(2deg);
  box-shadow:
    0 18px 40px -18px rgba(0, 0, 0, 0.7),
    0 0 0 1px color-mix(in srgb, var(--accent-c) 25%, transparent),
    0 0 60px -20px color-mix(in srgb, var(--accent-c) 50%, transparent);
}
.diagram-card:hover::before { opacity: 1; }

.dc-preview {
  position: relative;
  background:
    linear-gradient(180deg, #08090c 0%, #0b0d12 100%);
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.dc-preview::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    160px circle at 90% 8%,
    color-mix(in srgb, var(--accent-c) 22%, transparent),
    transparent 60%
  );
  pointer-events: none;
  opacity: 0.7;
  transition: opacity 0.3s ease;
}
.diagram-card:hover .dc-preview::after { opacity: 1; }
.dc-svg {
  display: block;
  width: 100%;
  height: auto;
  color: var(--accent-c);
  position: relative;
  z-index: 1;
}

.dc-meta {
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  z-index: 2;
}
.dc-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--accent-c);
  text-transform: uppercase;
  margin-bottom: 2px;
  align-self: flex-start;
  padding: 3px 8px;
  border-radius: 4px;
  background: color-mix(in srgb, var(--accent-c) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-c) 22%, transparent);
}
.dc-meta h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.01em;
}
.dc-meta p {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.55;
}

/* Per-node entrance: fade + slight rise. Replays each time card hovers
   (via .diagram-card:hover .dc-node) so it always feels alive. */
.dc-svg .dc-node,
.dc-svg .dc-edge,
.dc-svg .dc-port,
.dc-svg .dc-diamond,
.dc-svg .dc-bar {
  transform-origin: center;
}
.diagram-card.is-visible .dc-node {
  animation: dc-node-pop 0.55s var(--ease-out) both;
}
.diagram-card.is-visible .dc-node.n1 { animation-delay: 0.05s; }
.diagram-card.is-visible .dc-node.n2 { animation-delay: 0.15s; }
.diagram-card.is-visible .dc-node.n3 { animation-delay: 0.25s; }
.diagram-card.is-visible .dc-node.n4 { animation-delay: 0.35s; }

.diagram-card.is-visible .dc-edge {
  stroke-dasharray: 220;
  stroke-dashoffset: 220;
  animation: dc-edge-draw 0.7s ease-out 0.3s forwards;
}
.diagram-card.is-visible .dc-edge.e2 { animation-delay: 0.45s; }
.diagram-card.is-visible .dc-edge.e3 { animation-delay: 0.6s; }
.diagram-card.is-visible .dc-edge.e4 { animation-delay: 0.75s; }
.diagram-card.is-visible .dc-edge[stroke-dasharray] {
  /* Edges that already have a stroke-dasharray (dotted REQ, SEQ return)
     keep their pattern - skip the draw-on animation by overriding. */
  animation: none;
  stroke-dashoffset: 0;
  opacity: 0;
  animation: dc-fade-in 0.5s ease-out 0.5s forwards;
}

.diagram-card.is-visible .dc-port {
  opacity: 0;
  animation: dc-fade-in 0.4s ease-out 0.6s forwards;
}
.diagram-card.is-visible .dc-diamond {
  opacity: 0;
  animation: dc-fade-in 0.4s ease-out 0.7s forwards;
}
.diagram-card.is-visible .dc-bar {
  opacity: 0;
  animation: dc-fade-in 0.45s ease-out 0.5s forwards;
}

@keyframes dc-node-pop {
  from { opacity: 0; transform: translateY(4px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0)  scale(1); }
}
@keyframes dc-edge-draw {
  from { stroke-dashoffset: 220; }
  to   { stroke-dashoffset: 0; }
}
@keyframes dc-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Hover replay - bump nodes a hair so the card feels reactive */
.diagram-card:hover .dc-node {
  animation: dc-node-bump 0.6s var(--ease-spring) both;
}
.diagram-card:hover .dc-node.n2 { animation-delay: 0.06s; }
.diagram-card:hover .dc-node.n3 { animation-delay: 0.12s; }
.diagram-card:hover .dc-node.n4 { animation-delay: 0.18s; }
@keyframes dc-node-bump {
  0%   { transform: translateY(0) scale(1); }
  40%  { transform: translateY(-1.5px) scale(1.02); }
  100% { transform: translateY(0) scale(1); }
}

/* Subtle dot grid behind each preview, shared pattern */
.dc-grid { display: none; }   /* placeholder so future iterations can add a pattern */

/* =========================================================================
   Versions (v1 / v2)
   ========================================================================= */

.version-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}
.version-card {
  position: relative;
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  overflow: hidden;
  transition: transform 0.4s var(--ease-out),
              border-color 0.25s ease,
              box-shadow 0.3s ease;
}
.version-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(360px circle at 100% 0%,
    color-mix(in srgb, var(--vc-accent, var(--accent)) 14%, transparent),
    transparent 55%);
  opacity: 0.6;
  transition: opacity 0.3s ease;
  z-index: 0;
}
.version-card:hover { transform: translateY(-3px); box-shadow:
  0 22px 48px -22px rgba(0,0,0,0.7),
  0 0 0 1px color-mix(in srgb, var(--vc-accent, var(--accent)) 25%, transparent),
  0 0 70px -25px color-mix(in srgb, var(--vc-accent, var(--accent)) 50%, transparent);
}
.version-card:hover::before { opacity: 1; }
.version-card > * { position: relative; z-index: 1; }

.version-live {
  --vc-accent: #34d399;
  border-color: rgba(52,211,153,0.30);
}
.version-live:hover { border-color: rgba(52,211,153,0.55); }
.version-beta {
  --vc-accent: #fbbf24;
  border-color: rgba(245,158,11,0.28);
}
.version-beta:hover { border-color: rgba(245,158,11,0.55); }

/* Live badge pulse: the "Available now" dot quietly breathes so the card
   reads as alive even when nothing else moves. */
.version-live .version-badge .dot-ok {
  animation: live-pulse 2.4s ease-in-out infinite;
}
@keyframes live-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(52,211,153,0.55); }
  50%      { box-shadow: 0 0 0 6px rgba(52,211,153,0); }
}

.version-head { display: flex; flex-direction: column; gap: 12px; }
.version-head h3 {
  font-size: 28px;
  letter-spacing: -0.02em;
}
.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  align-self: flex-start;
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge-ok   { background: rgba(34,197,94,0.12);  color: #4ade80; border: 1px solid rgba(34,197,94,0.28); }
.badge-beta { background: rgba(245,158,11,0.10); color: #fbbf24; border: 1px solid rgba(245,158,11,0.25); }

.version-lede { color: var(--text-2); font-size: 15px; line-height: 1.6; }
.version-list { display: flex; flex-direction: column; gap: 10px; }
.version-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-2);
  font-size: 14px;
}
.version-list svg { color: var(--accent); flex-shrink: 0; }
.version-card .btn { align-self: flex-start; margin-top: 4px; }

/* =========================================================================
   Pricing
   ========================================================================= */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  max-width: 880px;
  margin: 0 auto;
}
.price-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.price-pro {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(96,165,250,0.04), transparent 40%) var(--surface);
}
.price-ribbon {
  position: absolute;
  top: -11px;
  right: 24px;
  background: var(--accent);
  color: #07101f;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
}
.price-name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
}
.price-amount {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 4px 0;
}
.price-amount span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-3);
  letter-spacing: 0;
}
.price-lede { color: var(--text-2); font-size: 14px; }
.price-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.price-features li {
  color: var(--text-2);
  font-size: 14px;
  padding-left: 22px;
  position: relative;
}
.price-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 12px;
  height: 7px;
  border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
}
.price-features li strong {
  color: var(--text-1);
}
.price-features li strong::first-letter { text-transform: uppercase; }
.pricing-footnote {
  margin-top: 32px;
  text-align: center;
  color: var(--text-3);
  font-size: 14px;
}

/* =========================================================================
   Trust section
   ========================================================================= */

.section-trust { padding-bottom: 72px; }
.trust-badges {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 36px;
}
.trust-badges li {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.3s var(--ease-out),
              border-color 0.25s ease,
              box-shadow 0.3s ease;
  overflow: hidden;
}
.trust-badges li::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(220px circle at 100% 0%, var(--accent-glow), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.trust-badges li:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border));
  box-shadow:
    0 14px 30px -16px rgba(0, 0, 0, 0.7),
    0 0 0 1px color-mix(in srgb, var(--accent) 22%, transparent);
}
.trust-badges li:hover::before { opacity: 1; }
.trust-badges svg {
  color: var(--accent-2);
  position: relative;
  z-index: 1;
  transition: color 0.25s ease, transform 0.4s var(--ease-spring);
}
.trust-badges li:hover svg {
  color: var(--accent);
  transform: scale(1.08) rotate(-3deg);
}
.trust-badges span { display: flex; flex-direction: column; position: relative; z-index: 1; }
.trust-badges strong { font-size: 13px; color: var(--text-1); }
.trust-badges small { font-size: 12px; color: var(--text-3); }

.trust-links {
  text-align: center;
  color: var(--text-3);
  font-size: 14px;
}
.trust-links a { color: var(--text-2); margin: 0 8px; }
.trust-links a:hover { color: var(--accent-2); }

/* =========================================================================
   Final CTA
   ========================================================================= */

.section-cta {
  position: relative;
  text-align: center;
  padding: 96px 0;
  background: linear-gradient(180deg, var(--bg-1), var(--bg-0));
  border-top: 1px solid var(--border);
  overflow: hidden;
}
.section-cta::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -40%;
  width: 1100px;
  height: 700px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse 50% 70% at 50% 50%,
    var(--accent-glow), transparent 65%);
  pointer-events: none;
  filter: blur(8px);
}
.section-cta > .container { position: relative; z-index: 1; }
.section-cta h2 {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: 10px;
  letter-spacing: -0.03em;
}
.section-cta p {
  color: var(--text-2);
  margin-bottom: 28px;
}
.section-cta .hero-ctas { justify-content: center; margin-bottom: 0; }

/* =========================================================================
   Footer
   ========================================================================= */

.site-footer {
  background: var(--bg-1);
  border-top: 1px solid var(--border);
  padding-top: 56px;
  color: var(--text-3);
  font-size: 14px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.3fr 2fr;
  gap: 48px;
  padding-bottom: 40px;
}
.footer-brand .brand { margin-bottom: 12px; }
.footer-tag { color: var(--text-3); font-size: 13px; max-width: 300px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col h4 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-bottom: 4px;
}
.footer-col a {
  color: var(--text-2);
  font-size: 14px;
}
.footer-col a:hover { color: var(--accent-2); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-4);
  font-size: 13px;
}
.footer-bottom .container { padding: 0; }
.footer-status { display: inline-flex; align-items: center; gap: 8px; }
.footer-status a {
  color: var(--text-3);
  transition: color 0.15s ease;
}
.footer-status a:hover { color: var(--text-1); }

/* =========================================================================
   Scroll reveal (animated by landing.js)
   ========================================================================= */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================================================
   Responsive
   ========================================================================= */

@media (max-width: 1020px) {
  .grid-4          { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .diagram-grid    { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .trust-badges    { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .hero-inner      { grid-template-columns: 1fr; gap: 48px; }
  .hero-canvas     { max-width: 600px; margin: 0 auto; width: 100%; }
}

@media (max-width: 760px) {
  .how-steps       { grid-template-columns: 1fr; gap: 28px; }
  .how-divider     { display: none; }
  .section         { padding: 64px 0; }
  .hero            { padding: 56px 0 72px; }
  .site-nav        { display: none; }
  .header-cta .btn-ghost { display: none; }
  .menu-toggle     { display: inline-flex; }

  .grid-4          { grid-template-columns: 1fr; }
  .diagram-grid    { grid-template-columns: 1fr; }
  .version-grid    { grid-template-columns: 1fr; }
  .pricing-grid    { grid-template-columns: 1fr; }
  .trust-badges    { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-inner    { grid-template-columns: 1fr; gap: 32px; }
  .footer-cols     { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
  .footer-bottom   { flex-direction: column; gap: 8px; text-align: center; }

  .section-head    { margin-bottom: 36px; }
}

@media (max-width: 440px) {
  .footer-cols     { grid-template-columns: 1fr 1fr; }
  .trust-badges    { grid-template-columns: 1fr; }
  .hero-title      { font-size: 38px; }
}

/* Reduced motion - respect user preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* Print */
@media print {
  .site-header, .site-footer, .section-cta, .menu-toggle, .hero-glow { display: none; }
  body { background: #fff; color: #000; }
  .container { max-width: none; }
}