/* ============================================================================
   Qwave Design System — "Deep Signal"
   A single reusable token + component sheet consumed by index.html and
   design-system.html. Built on modern CSS: oklch() palettes, color-mix(),
   @property-animated custom properties, container queries, :has(), scroll-
   driven animations, and cross-document view transitions.
   ========================================================================== */

/* ---- Animatable custom properties -------------------------------------- */
@property --qw-angle {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}
@property --qw-shine {
  syntax: "<percentage>";
  inherits: false;
  initial-value: 0%;
}

/* ---- Design tokens ------------------------------------------------------ */
:root {
  color-scheme: dark;

  /* Palette primitives — oklch for perceptually even ramps.
     Brand: aqua (the "wave"), signal-blue, quantum-green, pq-violet. */
  --aqua:        oklch(0.86 0.13 200);
  --aqua-bright: oklch(0.92 0.11 197);
  --aqua-deep:   oklch(0.62 0.11 210);
  --blue:        oklch(0.72 0.13 249);
  --green:       oklch(0.85 0.18 156);
  --violet:      oklch(0.72 0.16 292);
  --amber:       oklch(0.80 0.15 78);
  --rose:        oklch(0.68 0.19 20);

  /* Ink ramp — deep-space navy toward black. */
  --ink-900: oklch(0.16 0.03 250);
  --ink-950: oklch(0.12 0.03 252);
  --ink-975: oklch(0.09 0.025 253);
  --ink-999: oklch(0.05 0.02 254);

  /* Semantic surfaces */
  --bg:        var(--ink-999);
  --surface:   color-mix(in oklab, var(--ink-900) 62%, transparent);
  --surface-2: color-mix(in oklab, var(--ink-900) 82%, transparent);
  --glass:     color-mix(in oklab, var(--ink-950) 55%, transparent);

  /* Borders / hairlines */
  --hairline:      color-mix(in oklab, var(--aqua) 16%, transparent);
  --hairline-soft: color-mix(in oklab, white 8%, transparent);
  --border-strong: color-mix(in oklab, var(--aqua) 42%, transparent);

  /* Text */
  --text:        oklch(0.95 0.01 240);
  --text-muted:  oklch(0.74 0.02 245);
  --text-faint:  oklch(0.58 0.02 248);

  /* Brand semantic aliases */
  --brand:   var(--aqua);
  --brand-2: var(--blue);
  --accent:  var(--green);
  --quantum: var(--violet);

  /* Glows */
  --glow-brand: 0 0 40px color-mix(in oklab, var(--aqua) 45%, transparent);
  --glow-soft:  0 0 24px color-mix(in oklab, var(--aqua) 24%, transparent);

  /* Signature gradients */
  --grad-brand: linear-gradient(135deg, var(--aqua) 0%, var(--blue) 100%);
  --grad-aurora: linear-gradient(120deg,
      var(--aqua) 0%, var(--blue) 42%, var(--violet) 78%, var(--green) 120%);
  --grad-text: linear-gradient(120deg,
      oklch(0.99 0.01 220) 0%, var(--aqua-bright) 55%, var(--blue) 100%);

  /* Typography */
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", monospace;

  /* Fluid type scale (1.25 minor-third, clamped) */
  --step--1: clamp(0.83rem, 0.79rem + 0.18vw, 0.94rem);
  --step-0:  clamp(1rem, 0.95rem + 0.25vw, 1.15rem);
  --step-1:  clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --step-2:  clamp(1.56rem, 1.4rem + 0.85vw, 2.1rem);
  --step-3:  clamp(1.95rem, 1.7rem + 1.4vw, 3rem);
  --step-4:  clamp(2.44rem, 2rem + 2.4vw, 4.2rem);
  --step-5:  clamp(3rem, 2.2rem + 4.2vw, 6rem);

  /* Spacing scale */
  --sp-1: 0.25rem; --sp-2: 0.5rem;  --sp-3: 0.75rem; --sp-4: 1rem;
  --sp-5: 1.5rem;  --sp-6: 2rem;    --sp-7: 3rem;    --sp-8: 4rem;
  --sp-9: 6rem;    --sp-10: 8rem;

  /* Radii */
  --r-1: 8px; --r-2: 12px; --r-3: 18px; --r-4: 26px; --r-pill: 999px;

  /* Elevation */
  --shadow-1: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-2: 0 8px 30px rgba(0,0,0,0.5);
  --shadow-3: 0 24px 70px rgba(0,0,0,0.6);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-1: 0.16s; --dur-2: 0.3s; --dur-3: 0.6s; --dur-4: 1s;

  /* Layout */
  --container: 1180px;
}

/* Cross-document view transitions between pages of the system. */
@view-transition { navigation: auto; }

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  /* Static aurora field behind everything. */
  background-image:
    radial-gradient(60% 50% at 50% -10%, color-mix(in oklab, var(--aqua) 18%, transparent), transparent 70%),
    radial-gradient(50% 40% at 12% 20%, color-mix(in oklab, var(--blue) 12%, transparent), transparent 60%),
    radial-gradient(40% 40% at 88% 70%, color-mix(in oklab, var(--violet) 10%, transparent), transparent 60%);
  background-attachment: fixed;
}

img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
code, pre { font-family: var(--font-mono); }

::selection { background: color-mix(in oklab, var(--aqua) 40%, transparent); color: white; }

:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- Typography helpers ------------------------------------------------- */
.display {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.h1 { font-size: var(--step-5); }
.h2 { font-size: var(--step-4); }
.h3 { font-size: var(--step-3); }
.lead { font-size: var(--step-1); color: var(--text-muted); text-wrap: pretty; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--brand);
}
.gradient-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.muted { color: var(--text-muted); }
.mono { font-family: var(--font-mono); }

/* ---- Layout primitives -------------------------------------------------- */
.container {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}
.section { padding-block: clamp(4rem, 8vw, 8rem); }
.stack > * + * { margin-top: var(--sp-4); }
.center { text-align: center; }

/* ---- Buttons ------------------------------------------------------------ */
.btn {
  --_bg: var(--surface);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.85em 1.5em;
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: var(--step-0);
  border: 1px solid var(--hairline-soft);
  background: var(--_bg);
  color: var(--text);
  cursor: pointer;
  transition: transform var(--dur-1) var(--ease-out),
              box-shadow var(--dur-2) var(--ease-out),
              border-color var(--dur-2) var(--ease-out),
              background var(--dur-2) var(--ease-out);
  will-change: transform;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  border-color: transparent;
  background: var(--grad-brand);
  color: var(--ink-999);
  box-shadow: var(--glow-soft);
}
.btn-primary:hover { box-shadow: var(--glow-brand); }

.btn-ghost { background: color-mix(in oklab, white 4%, transparent); }
.btn-ghost:hover { border-color: var(--border-strong); background: color-mix(in oklab, white 8%, transparent); }

.btn-lg { padding: 1em 1.9em; font-size: var(--step-1); }

/* ---- Badge / pill ------------------------------------------------------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.4em 0.95em;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--brand);
  background: color-mix(in oklab, var(--aqua) 10%, transparent);
  border: 1px solid var(--hairline);
}
.pill .dot-live {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0 color-mix(in oklab, var(--green) 70%, transparent);
  animation: pulse-ring 2s var(--ease-out) infinite;
}
@keyframes pulse-ring {
  0%   { box-shadow: 0 0 0 0 color-mix(in oklab, var(--green) 60%, transparent); }
  70%  { box-shadow: 0 0 0 8px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

.tag {
  display: inline-flex; align-items: center; gap: 0.4em;
  padding: 0.25em 0.7em; border-radius: var(--r-pill);
  font-family: var(--font-mono); font-size: 0.72rem;
  letter-spacing: 0.04em;
  border: 1px solid var(--hairline-soft);
  color: var(--text-muted);
  background: color-mix(in oklab, white 3%, transparent);
}

/* ---- Card + gradient border -------------------------------------------- */
.card {
  position: relative;
  padding: var(--sp-6);
  border-radius: var(--r-3);
  background: var(--glass);
  border: 1px solid var(--hairline-soft);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  transition: transform var(--dur-2) var(--ease-out),
              border-color var(--dur-2) var(--ease-out),
              background var(--dur-2) var(--ease-out);
  overflow: clip;
}
/* Pointer-tracked spotlight (see JS setting --mx/--my). */
.card::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(
    420px circle at var(--mx, 50%) var(--my, 0%),
    color-mix(in oklab, var(--aqua) 14%, transparent), transparent 55%);
  opacity: 0;
  transition: opacity var(--dur-2) var(--ease-out);
  pointer-events: none;
}
.card:hover { transform: translateY(-5px); border-color: var(--border-strong); }
.card:hover::before { opacity: 1; }
.card h3 { font-family: var(--font-display); font-size: var(--step-1); margin-bottom: var(--sp-2); }
.card p { color: var(--text-muted); font-size: var(--step-0); }

.card-icon {
  display: grid; place-items: center;
  width: 46px; height: 46px; margin-bottom: var(--sp-4);
  border-radius: var(--r-2);
  font-size: 1.4rem;
  background: color-mix(in oklab, var(--aqua) 12%, transparent);
  border: 1px solid var(--hairline);
}

/* Animated conic gradient hairline for "featured" surfaces. */
.grad-border {
  position: relative;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--glass), var(--glass)) padding-box,
    conic-gradient(from var(--qw-angle),
      var(--aqua), var(--blue), var(--violet), var(--green), var(--aqua)) border-box;
  animation: spin-border 8s linear infinite;
}
@keyframes spin-border { to { --qw-angle: 360deg; } }

/* ---- Terminal ----------------------------------------------------------- */
.terminal {
  border-radius: var(--r-3);
  border: 1px solid var(--hairline);
  background: color-mix(in oklab, var(--ink-999) 88%, black);
  box-shadow: var(--shadow-3);
  overflow: hidden;
  font-family: var(--font-mono);
}
.terminal-bar {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--hairline-soft);
  background: color-mix(in oklab, white 3%, transparent);
}
.terminal-bar .dot { width: 11px; height: 11px; border-radius: 50%; }
.dot-r { background: #ff5f57; } .dot-y { background: #febc2e; } .dot-g { background: #28c840; }
.terminal-title { margin-left: 0.6rem; font-size: 0.78rem; color: var(--text-faint); }
.terminal pre {
  margin: 0; padding: var(--sp-5);
  font-size: var(--step--1); line-height: 1.8;
  color: color-mix(in oklab, var(--aqua) 70%, white);
  overflow-x: auto;
}
.terminal .cmt { color: var(--text-faint); }
.terminal .cmd { color: var(--green); }

/* ---- Divider / hairline glow ------------------------------------------- */
.hr-glow {
  height: 1px; border: 0;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}

/* ---- Reveal-on-scroll (JS toggles .in) --------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }
.reveal[data-delay="4"] { transition-delay: 0.32s; }
.reveal[data-delay="5"] { transition-delay: 0.40s; }

/* ---- Scroll-driven top progress bar (bleeding-edge, progressive) ------- */
.scroll-progress {
  position: fixed; inset: 0 0 auto 0; height: 3px; z-index: 100;
  transform-origin: 0 50%;
  background: var(--grad-aurora);
  transform: scaleX(0);
}
@supports (animation-timeline: scroll()) {
  .scroll-progress {
    animation: grow-x linear;
    animation-timeline: scroll(root block);
  }
  @keyframes grow-x { to { transform: scaleX(1); } }
}