/* =============================================================
   RYTT Sovereign Semiotics — Design System v0.1.0
   Palette: deep ink · cyan accent · gold secondary · no violet
   Type: Instrument Serif (display) + Geist (body/mono)
   ============================================================= */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Geist:wght@300..700&family=Geist+Mono:wght@300..500&display=swap');

:root {
  color-scheme: dark;

  /* Surfaces */
  --ink:        #060a12;
  --ink-1:      #0c1120;
  --ink-2:      #111827;
  --panel:      rgba(13, 21, 40, .78);
  --line:       rgba(120, 160, 210, .16);
  --line-hi:    rgba(120, 160, 210, .32);

  /* Text */
  --text:       #edf0f5;
  --muted:      #7a8ba0;
  --faint:      #3d4f62;

  /* Accent */
  --cyan:       #3ee8ff;
  --cyan-glow:  rgba(62, 232, 255, .18);
  --cyan-dim:   rgba(62, 232, 255, .08);
  --gold:       #e8c87c;
  --gold-glow:  rgba(232, 200, 124, .14);

  /* Radius */
  --r-sm: 3px;
  --r-md: 6px;
  --r-lg: 10px;

  /* Transitions */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --t-fast: 180ms;
  --t-med:  280ms;

  /* Layout */
  --max: 1160px;
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'Geist', 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, monospace;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; -webkit-font-smoothing: antialiased; }
body {
  min-width: 320px;
  font-family: var(--font-body);
  font-size: clamp(0.9375rem, 0.9rem + 0.2vw, 1.0625rem);
  color: var(--text);
  background-color: var(--ink);
  line-height: 1.65;
  overflow-x: hidden;
}

/* ---- Global background ---- */
body::before {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  content: "";
  background:
    radial-gradient(ellipse 80% 50% at 75% 0%, rgba(30, 80, 120, .32), transparent),
    radial-gradient(ellipse 60% 40% at 10% 80%, rgba(62, 232, 255, .06), transparent);
}
body::after {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  content: "";
  opacity: .18;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.6) 0%, transparent 65%);
}

a { color: inherit; }
img, svg { display: block; max-width: 100%; }
h1,h2,h3,h4 { line-height: 1.08; }
p { max-width: 72ch; }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }

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

/* ---- Skip link ---- */
.skip-link {
  position: fixed; left: 1rem; top: 1rem; z-index: 100;
  padding: .65rem 1rem;
  color: var(--ink); background: var(--gold);
  font-size: .82rem; font-weight: 700;
  border-radius: var(--r-sm);
  transform: translateY(-200%);
  transition: transform var(--t-fast) var(--ease);
  text-decoration: none;
}
.skip-link:focus { transform: translateY(0); }

/* ---- Layout shell ---- */
.shell {
  width: min(var(--max), 100% - 3rem);
  margin-inline: auto;
}

/* ---- Header ---- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  display: flex;
  width: min(100%, 100vw);
  padding: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(6, 10, 18, .82);
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
}
.header-inner {
  width: min(var(--max), 100% - 3rem);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
}
.brand {
  display: inline-flex; gap: .75rem; align-items: center;
  color: var(--text); text-decoration: none;
  font-weight: 700; font-size: .88rem; letter-spacing: .05em; text-transform: uppercase;
  transition: color var(--t-fast) var(--ease);
}
.brand:hover { color: var(--cyan); }
.brand-mark {
  display: grid; width: 2.2rem; height: 2.2rem; place-items: center;
  border: 1px solid var(--cyan);
  color: var(--cyan); font-family: var(--font-display); font-size: .88rem;
  box-shadow: 0 0 20px var(--cyan-glow), inset 0 0 12px var(--cyan-dim);
  border-radius: var(--r-sm);
  letter-spacing: -.05em;
}
.brand small { display: block; color: var(--muted); font-size: .56rem; letter-spacing: .15em; font-weight: 400; margin-top: .1rem; }
.site-nav {
  display: flex; gap: 1.4rem; align-items: center;
  font-size: .82rem; color: var(--muted);
}
.site-nav a { text-decoration: none; transition: color var(--t-fast) var(--ease); padding: .25rem 0; }
.site-nav a:hover { color: var(--cyan); }
.nav-pill {
  padding: .35rem .85rem;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  color: var(--text) !important;
  font-size: .78rem; font-weight: 600;
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease) !important;
}
.nav-pill:hover { border-color: var(--cyan) !important; background: var(--cyan-dim) !important; }

/* ---- Hero ---- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(280px, 1.1fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
  padding: clamp(5rem, 10vw, 8rem) 0 clamp(4rem, 8vw, 6rem);
}
.hero-copy { max-width: 640px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  color: var(--cyan); font-size: .72rem; font-weight: 700;
  letter-spacing: .18em; text-transform: uppercase;
}
.status-dot {
  width: .42rem; height: .42rem; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,100% { box-shadow: 0 0 10px var(--cyan); }
  50%      { box-shadow: 0 0 20px var(--cyan), 0 0 36px var(--cyan-glow); }
}
h1 {
  margin-top: 1rem;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 7.5vw, 6.8rem);
  font-weight: 400;
  letter-spacing: -.04em;
  line-height: 1.02;
}
h1 em { color: var(--gold); font-style: italic; }
.hero-lede {
  margin-top: 1.6rem;
  color: var(--muted);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  line-height: 1.7;
  max-width: 560px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2.2rem; }
.proof-line {
  display: flex; flex-wrap: wrap; gap: 1rem; align-items: baseline;
  margin-top: 2rem;
  color: var(--muted); font-size: .78rem;
  border-top: 1px solid var(--line);
  padding-top: 1.4rem;
}
.proof-line .eq {
  color: var(--gold);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.25rem;
}

/* ---- Hero art ---- */
.hero-art {
  position: relative;
  display: flex; align-items: center; justify-content: center;
}
.hero-art::before {
  content: "";
  position: absolute; inset: 5%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(62, 232, 255, .15) 0%, transparent 70%);
  filter: blur(40px);
  z-index: -1;
  animation: breathe-glow 4s ease-in-out infinite;
}
@keyframes breathe-glow {
  0%,100% { opacity: .7; transform: scale(.95); }
  50%      { opacity: 1; transform: scale(1.05); }
}
.glyph-canvas-wrap {
  width: 100%; max-width: 540px;
  aspect-ratio: 1;
}
#hero-canvas { width: 100%; height: 100%; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .45rem;
  min-height: 2.75rem; padding: .65rem 1.2rem;
  font-size: .84rem; font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  transition: border-color var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--cyan); color: var(--ink);
  border-color: var(--cyan);
}
.btn-primary:hover {
  background: #8ef5ff; border-color: #8ef5ff;
  box-shadow: 0 4px 24px var(--cyan-glow);
}
.btn-secondary {
  background: rgba(255,255,255,.03);
  color: var(--text);
}
.btn-secondary:hover {
  border-color: var(--gold);
  background: var(--gold-glow);
}
.btn-ghost {
  background: transparent; color: var(--muted); border-color: transparent;
}
.btn-ghost:hover { color: var(--cyan); }

/* ---- Section shell ---- */
.section { padding: clamp(4rem, 8vw, 7rem) 0; }
.section-head { max-width: 700px; margin-bottom: 3rem; }
.section-head .eyebrow { margin-bottom: .75rem; }
h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.4rem);
  font-weight: 400;
  letter-spacing: -.035em;
  line-height: 1.08;
}
h2 em { font-style: italic; color: var(--gold); }
.section-sub {
  margin-top: 1rem;
  color: var(--muted);
  font-size: clamp(.9rem, 1.5vw, 1.05rem);
}

/* ---- Feature grid ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.feature-card {
  padding: 2rem 1.75rem;
  background: var(--ink-1);
  transition: background var(--t-med) var(--ease);
}
.feature-card:hover { background: var(--ink-2); }
.feature-num {
  font-family: var(--font-mono);
  font-size: .7rem; color: var(--cyan);
  letter-spacing: .1em;
  margin-bottom: 2rem;
}
h3 {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 1.8vw, 1.45rem);
  font-weight: 400;
  margin-bottom: .75rem;
}
.feature-card p { color: var(--muted); font-size: .9rem; max-width: 36ch; }

/* ---- Metrics strip ---- */
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  margin: 3rem 0;
}
.metric {
  padding: 1.75rem 1.5rem;
  background: var(--ink-1);
  text-align: center;
}
.metric-val {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  color: var(--cyan);
  letter-spacing: -.04em;
}
.metric-label {
  display: block;
  margin-top: .4rem;
  color: var(--muted);
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
}

/* ---- Explore grid ---- */
.explore-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1rem;
}
.explore-card {
  display: flex; flex-direction: column;
  padding: 2rem 1.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--ink-1);
  text-decoration: none;
  transition:
    border-color var(--t-med) var(--ease),
    background var(--t-med) var(--ease),
    transform var(--t-med) var(--ease),
    box-shadow var(--t-med) var(--ease);
}
.explore-card:hover {
  border-color: var(--cyan);
  background: linear-gradient(145deg, rgba(20, 55, 80, .9), var(--ink-1));
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0,0,0,.3);
}
.card-kicker {
  display: inline-block;
  color: var(--cyan); font-size: .7rem; font-weight: 700;
  letter-spacing: .16em; text-transform: uppercase;
  margin-bottom: 1.4rem;
}
.explore-card h3 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 400;
  color: var(--text);
}
.explore-card-lg h3 { font-size: clamp(1.8rem, 3vw, 2.6rem); }
.explore-card p { margin-top: .75rem; color: var(--muted); font-size: .88rem; max-width: 36ch; }
.card-arrow {
  margin-top: auto; padding-top: 2rem;
  color: var(--gold); font-size: .78rem; font-weight: 700;
  display: flex; align-items: center; gap: .4rem;
  transition: gap var(--t-fast) var(--ease);
}
.explore-card:hover .card-arrow { gap: .7rem; }

/* ---- Closing CTA ---- */
.closing {
  display: flex; align-items: flex-end; justify-content: space-between; gap: 2.5rem;
  padding: 2.5rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, rgba(20,40,70,.9), var(--ink-1));
  margin-bottom: 4rem;
}
.closing h2 { max-width: 560px; }
.closing-actions { display: flex; flex-wrap: wrap; gap: .75rem; flex-shrink: 0; }

/* ---- Footer ---- */
.site-footer {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
  color: var(--muted); font-size: .76rem;
}
.site-footer a { text-decoration: none; transition: color var(--t-fast) var(--ease); }
.site-footer a:hover { color: var(--cyan); }

/* ---- Scroll reveal ---- */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
[data-reveal].visible {
  opacity: 1;
  transform: none;
}
[data-reveal-delay="1"] { transition-delay: 0.08s; }
[data-reveal-delay="2"] { transition-delay: 0.16s; }
[data-reveal-delay="3"] { transition-delay: 0.24s; }
[data-reveal-delay="4"] { transition-delay: 0.32s; }

/* ---- Playground panel ---- */
.playground-wrap {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-1);
}
.playground-toolbar {
  display: flex; align-items: center; gap: .75rem;
  padding: .8rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: var(--ink-2);
  font-size: .78rem; color: var(--muted);
}
.playground-toolbar .label { margin-right: auto; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--cyan); font-size: .7rem; }
.playground-body { display: grid; grid-template-columns: 1fr 1fr; min-height: 180px; }
.pane {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: .84rem;
  border: none; outline: none;
  background: transparent;
  color: var(--text);
  resize: none;
  line-height: 1.7;
}
.pane-out { border-left: 1px solid var(--line); color: var(--cyan); }
.playground-footer {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
}
.pg-metric {
  padding: .75rem 1rem;
  border-right: 1px solid var(--line);
  font-size: .72rem;
}
.pg-metric:last-child { border-right: none; }
.pg-metric .val { display: block; font-family: var(--font-mono); font-size: .9rem; color: var(--gold); }
.pg-metric .lbl { color: var(--muted); margin-top: .2rem; }
.pg-status {
  display: inline-flex; align-items: center; gap: .35rem;
  font-size: .7rem; padding: .2rem .55rem;
  border-radius: var(--r-sm);
  background: rgba(62, 232, 255, .08);
  border: 1px solid rgba(62, 232, 255, .2);
  color: var(--cyan);
}
.pg-status.fail {
  background: rgba(255, 80, 80, .08);
  border-color: rgba(255,80,80,.2);
  color: #ff6b6b;
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 4rem; }
  .hero-art { max-width: 420px; margin: 0 auto; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .explore-grid { grid-template-columns: 1fr 1fr; }
  .metrics-strip { grid-template-columns: repeat(2, 1fr); }
  .closing { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 600px) {
  .shell { width: calc(100% - 2rem); }
  .feature-grid, .explore-grid, .metrics-strip { grid-template-columns: 1fr; }
  .playground-body { grid-template-columns: 1fr; }
  .pane-out { border-left: none; border-top: 1px solid var(--line); }
  .playground-footer { grid-template-columns: repeat(2, 1fr); }
  h1 { font-size: clamp(3rem, 16vw, 4.5rem); }
  .site-nav .hide-sm { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}