/* ============================================================
   RUHN — shared design system
   The trailer for the app: clear first, mysterious second.
   Dark, blue-tinted, atmospheric (James Jean) over a precise
   geometric grid (Felipe Pantone). Accent used sparingly.
   ============================================================ */

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

:root {
  /* ── Surfaces (neutrals tinted toward D.I.A.N.A. blue, hue ~258) ── */
  --bg:            oklch(0.085 0.018 258);
  --bg-2:          oklch(0.115 0.018 258);
  --surface:       oklch(0.16 0.016 258 / 0.55);
  --surface-2:     oklch(0.20 0.018 258 / 0.55);
  --hairline:      oklch(0.55 0.03 258 / 0.14);
  --hairline-2:    oklch(0.62 0.04 258 / 0.26);

  /* ── Text ── */
  --text:          oklch(0.96 0.005 258);
  --text-2:        oklch(0.78 0.012 258);
  --text-3:        oklch(0.60 0.016 258);

  /* ── D.I.A.N.A. blue (#0055FF) ── */
  --diana:         #0055ff;
  --diana-bright:  #4d8bff;
  --diana-dim:     color-mix(in oklab, var(--diana) 55%, var(--bg));
  --diana-soft:    color-mix(in oklab, var(--diana) 16%, transparent);
  --diana-faint:   color-mix(in oklab, var(--diana) 8%, transparent);

  /* ── Effort spectrum (locked brand values) ── */
  --low:  #4ade80;
  --mid:  #facc15;
  --high: #fb923c;
  --peak: #ef4444;

  /* ── Spacing (4pt) ── */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px; --s-5: 20px;
  --s-6: 24px; --s-8: 32px; --s-10: 40px; --s-12: 48px; --s-16: 64px;
  --s-20: 80px; --s-24: 96px; --s-32: 128px;

  /* ── Type ── */
  --font-display: 'Anybody', system-ui, sans-serif;
  --font-body:    'Sora', system-ui, sans-serif;

  --ease:   cubic-bezier(0.22, 1, 0.36, 1);   /* ease-out-quint */
  --ease-2: cubic-bezier(0.4, 0, 0.2, 1);
  --radius: 14px;
  --radius-lg: 20px;

  --glass-blur: blur(28px) saturate(150%);
  --shadow: 0 24px 60px -20px oklch(0 0 0 / 0.6), 0 4px 16px oklch(0 0 0 / 0.35);
  --maxw: 1080px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* ── Atmosphere: ambient field glows + faint grid + grain ── */
.atmos { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }

.atmos__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
}
.atmos__glow--a {
  top: -22%; left: -14%;
  width: min(70vw, 760px); aspect-ratio: 1;
  background: radial-gradient(circle, color-mix(in oklab, var(--diana) 22%, transparent) 0%, transparent 68%);
  opacity: 0.5;
}
.atmos__glow--b {
  bottom: -28%; right: -16%;
  width: min(60vw, 640px); aspect-ratio: 1;
  background: radial-gradient(circle, oklch(0.30 0.14 286 / 0.5) 0%, transparent 70%);
  opacity: 0.4;
}

.atmos__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, oklch(0.7 0.05 258 / 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, oklch(0.7 0.05 258 / 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, black 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, black 0%, transparent 78%);
}

.atmos__grain {
  position: absolute; inset: -50%;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ============================================================
   NAV — shared floating glass bar (every page)
   ============================================================ */
.nav {
  position: fixed;
  top: clamp(12px, 2vw, 18px);
  left: 50%;
  transform: translateX(-50%);
  width: min(calc(100% - 28px), var(--maxw));
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  padding: 10px 12px 10px 18px;
  background: oklch(0.16 0.016 258 / 0.5);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--hairline);
  border-radius: 16px;
  box-shadow: 0 10px 34px oklch(0 0 0 / 0.35);
}
.nav::before {
  content: ''; position: absolute; inset: 0; border-radius: inherit;
  background: linear-gradient(180deg, oklch(1 0 0 / 0.06) 0%, transparent 42%);
  pointer-events: none;
}
.nav__brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.22em;
  color: var(--text);
  text-decoration: none;
  padding: 6px 4px;
  line-height: 1;
  transition: color 0.25s var(--ease);
}
.nav__brand:hover { color: var(--diana-bright); }
.nav__links { display: flex; align-items: center; gap: 2px; }
.nav__links a {
  color: var(--text-3);
  text-decoration: none;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 10px 14px;
  border-radius: 10px;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.nav__links a:hover { color: var(--text); background: oklch(1 0 0 / 0.04); }
.nav__links a[aria-current="page"] {
  color: var(--text);
  background: var(--diana-soft);
}

/* ============================================================
   LAYOUT PRIMITIVES
   ============================================================ */
.shell { position: relative; z-index: 1; }
.wrap {
  width: min(calc(100% - 40px), var(--maxw));
  margin-inline: auto;
}
.reading { max-width: 68ch; }

section { position: relative; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--diana-bright);
}
.eyebrow::before {
  content: '';
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--diana);
  box-shadow: 0 0 10px 1px var(--diana);
  animation: pulse 3.2s var(--ease-2) infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: var(--s-4);
  margin-bottom: var(--s-8);
}
.section-label::after {
  content: '';
  flex: 1; height: 1px;
  background: linear-gradient(90deg, var(--hairline-2), transparent);
}

/* ============================================================
   TYPE
   ============================================================ */
.h-display {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--text);
}
h1, h2, h3 { font-weight: 600; }

p { color: var(--text-2); }
strong { color: var(--text); font-weight: 600; }

a.inline { color: var(--diana-bright); text-decoration: none; border-bottom: 1px solid color-mix(in oklab, var(--diana) 35%, transparent); transition: border-color 0.2s; }
a.inline:hover { border-color: var(--diana-bright); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-decoration: none;
  cursor: pointer;
  border-radius: 12px;
  padding: 15px 24px;
  min-height: 48px;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease),
              border-color 0.25s var(--ease), box-shadow 0.3s var(--ease);
}
.btn svg { width: 17px; height: 17px; flex: none; }

.btn--primary {
  color: #fff;
  background: var(--diana);
  border: 1px solid color-mix(in oklab, var(--diana) 70%, white 8%);
  box-shadow: 0 8px 26px -8px var(--diana), inset 0 1px 0 oklch(1 0 0 / 0.22);
}
.btn--primary:hover {
  background: var(--diana-bright);
  transform: translateY(-2px);
  box-shadow: 0 14px 38px -10px var(--diana), inset 0 1px 0 oklch(1 0 0 / 0.3);
}
.btn--primary:active { transform: translateY(0); }

.btn--ghost {
  color: var(--text);
  background: oklch(1 0 0 / 0.025);
  border: 1px solid var(--hairline-2);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.btn--ghost:hover { background: oklch(1 0 0 / 0.06); border-color: var(--text-3); transform: translateY(-2px); }

.btn .arrow { transition: transform 0.3s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

.status {
  font-size: 0.74rem;
  color: var(--text-3);
  letter-spacing: 0.04em;
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
}
.status .dot { width: 5px; height: 5px; border-radius: 50%; background: var(--low); box-shadow: 0 0 8px var(--low); }

/* ============================================================
   SIGNAL VORTEX — D.I.A.N.A.'s presence (CSS only)
   Concentric contra-rotating arcs. The thing people remember.
   ============================================================ */
.signal { position: relative; width: 100%; aspect-ratio: 1; display: grid; place-items: center; }
.signal__core {
  position: absolute; width: 18%; aspect-ratio: 1; border-radius: 50%;
  background: radial-gradient(circle, oklch(0.98 0.04 258) 0%, var(--diana) 38%, transparent 72%);
  filter: blur(2px);
  animation: breathe 6s var(--ease-2) infinite;
}
.signal__ring {
  position: absolute; border-radius: 50%;
  border: 1.5px solid transparent;
  will-change: transform;
}
.signal__ring--base { border-color: oklch(0.6 0.05 258 / 0.10); border-width: 1px; }
.r1 { width: 30%; aspect-ratio: 1; border-top-color: var(--diana); border-right-color: color-mix(in oklab, var(--diana) 45%, transparent); animation: spin 7s linear infinite; }
.r2 { width: 44%; aspect-ratio: 1; border-bottom-color: var(--diana-bright); border-left-color: color-mix(in oklab, var(--diana) 30%, transparent); animation: spin-r 11s linear infinite; }
.r3 { width: 58%; aspect-ratio: 1; border-top-color: color-mix(in oklab, var(--diana) 80%, transparent); border-left-color: color-mix(in oklab, var(--diana) 22%, transparent); animation: spin 16s linear infinite; }
.r4 { width: 72%; aspect-ratio: 1; border-right-color: color-mix(in oklab, var(--diana) 55%, transparent); animation: spin-r 22s linear infinite; }
.r5 { width: 86%; aspect-ratio: 1; border-bottom-color: color-mix(in oklab, var(--diana) 38%, transparent); border-top-color: color-mix(in oklab, var(--diana) 12%, transparent); animation: spin 30s linear infinite; }
.r6 { width: 100%; aspect-ratio: 1; border-left-color: color-mix(in oklab, var(--diana) 26%, transparent); animation: spin-r 42s linear infinite; }
.signal__halo {
  position: absolute; width: 70%; aspect-ratio: 1; border-radius: 50%;
  background: radial-gradient(circle, var(--diana-soft) 0%, transparent 62%);
  animation: breathe 6s var(--ease-2) infinite;
}
@keyframes spin   { to { transform: rotate(360deg); } }
@keyframes spin-r { to { transform: rotate(-360deg); } }
@keyframes breathe { 0%,100% { opacity: 0.85; transform: scale(1); } 50% { opacity: 1; transform: scale(1.06); } }

/* ============================================================
   EFFORT SPECTRUM
   ============================================================ */
.spectrum { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--hairline); }
.spectrum__tier {
  padding: var(--s-6) var(--s-4) var(--s-5);
  display: flex; flex-direction: column; gap: 6px;
  position: relative;
  background: var(--bg-2);
}
.spectrum__tier + .spectrum__tier { border-left: 1px solid var(--hairline); }
.spectrum__bar { height: 4px; border-radius: 99px; width: 100%; }
.spectrum__name { font-family: var(--font-display); font-weight: 700; font-size: 0.92rem; letter-spacing: 0.12em; }
.spectrum__effort { font-size: 0.7rem; color: var(--text-3); letter-spacing: 0.04em; }
.t-low  .spectrum__bar { background: var(--low); box-shadow: 0 0 16px color-mix(in oklab, var(--low) 60%, transparent); }
.t-low  .spectrum__name { color: var(--low); }
.t-mid  .spectrum__bar { background: var(--mid); box-shadow: 0 0 16px color-mix(in oklab, var(--mid) 60%, transparent); }
.t-mid  .spectrum__name { color: var(--mid); }
.t-high .spectrum__bar { background: var(--high); box-shadow: 0 0 16px color-mix(in oklab, var(--high) 60%, transparent); }
.t-high .spectrum__name { color: var(--high); }
.t-peak .spectrum__bar { background: var(--peak); box-shadow: 0 0 16px color-mix(in oklab, var(--peak) 60%, transparent); }
.t-peak .spectrum__name { color: var(--peak); }

/* ============================================================
   CARDS / SURFACES (used sparingly, not everywhere)
   ============================================================ */
.panel {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: var(--s-6);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease), transform 0.3s var(--ease);
}
.panel:hover { border-color: var(--hairline-2); }

.kicker {
  font-size: 0.66rem; font-weight: 600; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--diana-bright); margin-bottom: var(--s-2);
}

/* settings path chip */
.path {
  display: inline-flex; align-items: center;
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 0.78rem;
  color: var(--diana-bright);
  background: var(--diana-faint);
  border: 1px solid color-mix(in oklab, var(--diana) 22%, transparent);
  border-radius: 7px;
  padding: 2px 8px;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

/* ============================================================
   FOOTER — shared (every page)
   ============================================================ */
.footer {
  position: relative; z-index: 1;
  margin-top: var(--s-24);
  border-top: 1px solid var(--hairline);
}
.footer__inner {
  width: min(calc(100% - 40px), var(--maxw));
  margin-inline: auto;
  padding: var(--s-12) 0 var(--s-16);
  display: flex; flex-wrap: wrap; gap: var(--s-6) var(--s-8);
  align-items: center; justify-content: space-between;
}
.footer__brand { font-family: var(--font-display); font-weight: 800; letter-spacing: 0.2em; font-size: 0.95rem; color: var(--text-2); }
.footer__links { display: flex; flex-wrap: wrap; gap: var(--s-6); }
.footer__links a { color: var(--text-3); text-decoration: none; font-size: 0.76rem; letter-spacing: 0.06em; transition: color 0.2s; }
.footer__links a:hover { color: var(--text); }
.footer__meta { width: 100%; color: var(--text-3); font-size: 0.7rem; letter-spacing: 0.04em; padding-top: var(--s-4); }

/* ============================================================
   SCROLL REVEAL (progressive; visible without JS)
   ============================================================ */
.js [data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.js [data-reveal].is-in { opacity: 1; transform: none; }
.js [data-reveal][data-reveal="2"] { transition-delay: 0.08s; }
.js [data-reveal][data-reveal="3"] { transition-delay: 0.16s; }
.js [data-reveal][data-reveal="4"] { transition-delay: 0.24s; }

/* accessibility */
:focus-visible { outline: 2px solid var(--diana-bright); outline-offset: 3px; border-radius: 4px; }
.skip {
  position: absolute; left: 12px; top: 12px; z-index: 200;
  transform: translateY(-150%);
  background: var(--diana); color: #fff; padding: 10px 16px; border-radius: 10px;
  font-size: 0.8rem; font-weight: 600; text-decoration: none;
  transition: transform 0.2s var(--ease);
}
.skip:focus { transform: translateY(0); }

@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; }
  .js [data-reveal] { opacity: 1; transform: none; }
}

/* ── Responsive nav ── */
@media (max-width: 560px) {
  .nav { padding: 8px 8px 8px 14px; }
  .nav__links a { padding: 9px 9px; font-size: 0.64rem; letter-spacing: 0.1em; }
  .nav__brand { font-size: 0.85rem; letter-spacing: 0.18em; }
}