/* ==========================================================================
   PS2 STUDIO — base.css
   Design tokens, reset, typography, primitives, motion preferences.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. TOKENS
   -------------------------------------------------------------------------- */
:root {
  /* Ink (dark surfaces) */
  --ink:          #0a0b0d;
  --ink-1:        #0e1014;
  --ink-2:        #14171d;
  --ink-3:        #1c2028;

  /* Paper (light surfaces) */
  --paper:        #f3f2ee;
  --paper-1:      #eceae4;
  --paper-2:      #e2dfd7;

  /* Type colour */
  --on-ink:         #f5f4f1;
  --on-ink-mute:    rgba(245, 244, 241, 0.62);
  --on-ink-faint:   rgba(245, 244, 241, 0.48);
  --on-paper:       #0d0f12;
  --on-paper-mute:  rgba(13, 15, 18, 0.64);
  --on-paper-faint: rgba(13, 15, 18, 0.58);

  /* Signal — the single accent. Marks opportunity, motion and action. */
  --signal:       #ff4d1c;
  --signal-soft:  #ff7a4d;
  --signal-deep:  #c7360f;  /* accessible on paper for small text */
  --signal-glow:  rgba(255, 77, 28, 0.30);

  /* Lines */
  --line-ink:        rgba(245, 244, 241, 0.12);
  --line-ink-soft:   rgba(245, 244, 241, 0.07);
  --line-paper:      rgba(13, 15, 18, 0.14);
  --line-paper-soft: rgba(13, 15, 18, 0.08);

  /* Contextual aliases — flipped per section by .surface-* classes */
  --bg:          var(--ink);
  --fg:          var(--on-ink);
  --fg-mute:     var(--on-ink-mute);
  --fg-faint:    var(--on-ink-faint);
  --line:        var(--line-ink);
  --line-soft:   var(--line-ink-soft);
  --accent-text: var(--signal);

  /* Typography */
  --font-sans:  "Inter Tight", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: "Instrument Serif", "Times New Roman", Georgia, serif;
  --font-mono:  ui-monospace, "SF Mono", SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;

  --fs-display: clamp(3.4rem, 12vw, 11rem);
  --fs-h1:      clamp(2.6rem, 6.1vw, 6rem);
  --fs-h2:      clamp(2.05rem, 5.2vw, 4.6rem);
  --fs-h3:      clamp(1.5rem, 2.9vw, 2.5rem);
  --fs-h4:      clamp(1.18rem, 1.7vw, 1.5rem);
  --fs-lead:    clamp(1.06rem, 1.5vw, 1.375rem);
  --fs-body:    clamp(0.98rem, 1.05vw, 1.075rem);
  --fs-small:   0.875rem;
  --fs-label:   0.7rem;

  /* Spacing */
  --gutter:    clamp(1.25rem, 5vw, 5.5rem);
  --section-y: clamp(5.5rem, 12vw, 11rem);
  --maxw:      1440px;
  --maxw-text: 68ch;

  /* Radius */
  --r-sm: 6px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 34px;

  /* Motion */
  --e-out:   cubic-bezier(0.16, 1, 0.3, 1);
  --e-inout: cubic-bezier(0.65, 0, 0.35, 1);
  --e-soft:  cubic-bezier(0.33, 1, 0.68, 1);
  --t-fast:  0.22s;
  --t-mid:   0.45s;
  --t-slow:  0.9s;

  --nav-h: 74px;
  color-scheme: dark;
}

@media (min-width: 900px) { :root { --nav-h: 88px; } }

/* Surface contexts ------------------------------------------------------- */
.surface-ink,
.surface-ink-1,
.surface-ink-2 {
  --fg: var(--on-ink);
  --fg-mute: var(--on-ink-mute);
  --fg-faint: var(--on-ink-faint);
  --line: var(--line-ink);
  --line-soft: var(--line-ink-soft);
  --accent-text: var(--signal);
  background: var(--bg);
  color: var(--fg);
}
.surface-ink   { --bg: var(--ink); }
.surface-ink-1 { --bg: var(--ink-1); }
.surface-ink-2 { --bg: var(--ink-2); }

.surface-paper,
.surface-paper-1 {
  --fg: var(--on-paper);
  --fg-mute: var(--on-paper-mute);
  --fg-faint: var(--on-paper-faint);
  --line: var(--line-paper);
  --line-soft: var(--line-paper-soft);
  --accent-text: var(--signal-deep);
  background: var(--bg);
  color: var(--fg);
}
.surface-paper   { --bg: var(--paper); }
.surface-paper-1 { --bg: var(--paper-1); }

/* --------------------------------------------------------------------------
   2. RESET
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--on-ink);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.is-locked { overflow: hidden; }

h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 500; line-height: 1.02; letter-spacing: -0.035em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
img, video { height: auto; }
button, input, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
address { font-style: normal; }
hr { border: 0; border-top: 1px solid var(--line); margin: 0; }
summary { cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 2px;
}
:focus:not(:focus-visible) { outline: none; }

::selection { background: var(--signal); color: #fff; }

/* --------------------------------------------------------------------------
   3. TYPOGRAPHY PRIMITIVES
   -------------------------------------------------------------------------- */
.display { font-size: var(--fs-display); font-weight: 500; line-height: 0.86; letter-spacing: -0.045em; }
.h1 { font-size: var(--fs-h1); line-height: 0.92; letter-spacing: -0.042em; font-weight: 500; }
.h2 { font-size: var(--fs-h2); line-height: 0.96; letter-spacing: -0.038em; font-weight: 500; }
.h3 { font-size: var(--fs-h3); line-height: 1.06; letter-spacing: -0.03em; font-weight: 500; }
.h4 { font-size: var(--fs-h4); line-height: 1.24; letter-spacing: -0.022em; font-weight: 500; }

.lead {
  font-size: var(--fs-lead);
  line-height: 1.5;
  letter-spacing: -0.015em;
  color: var(--fg-mute);
  max-width: 54ch;
}

.body-text { color: var(--fg-mute); max-width: var(--maxw-text); }
.body-text + .body-text { margin-top: 1em; }

/* Editorial italic — used sparingly, one or two words per headline. */
.ital {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.015em;
  font-size: 1.06em;   /* optical correction: the serif runs smaller */
  line-height: 0.9;
}

.accent { color: var(--accent-text); }
.mute { color: var(--fg-mute); }
.faint { color: var(--fg-faint); }
.nowrap { white-space: nowrap; }

.label {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-faint);
  line-height: 1;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-mute);
  line-height: 1;
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  flex: none;
}

.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }

/* --------------------------------------------------------------------------
   4. LAYOUT UTILITIES
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide { max-width: 1720px; }

.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: clamp(3.5rem, 7vw, 6.5rem); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1.25rem, 2.4vw, 2.5rem);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -130%);
  z-index: 200;
  background: var(--signal);
  color: var(--ink);
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  font-size: var(--fs-small);
  font-weight: 500;
  transition: transform var(--t-fast) var(--e-out);
}
.skip-link:focus { transform: translate(-50%, 0); }

.rule { height: 1px; background: var(--line); width: 100%; }

/* Section heading block */
.sec-head { display: grid; gap: clamp(1.25rem, 2.4vw, 2rem); }
.sec-head__title { max-width: 18ch; }
@media (min-width: 900px) {
  .sec-head--split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 5rem);
  }
}

/* --------------------------------------------------------------------------
   5. BUTTONS + LINKS
   -------------------------------------------------------------------------- */
/* Ink on signal, not white on signal: white text over #ff4d1c is only 3.3:1,
   below AA. Near-black over the same orange is 5.9:1 and reads sharper. */
.btn {
  --btn-bg: var(--signal);
  --btn-fg: var(--ink);
  --btn-hover: #fff;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.8em;
  padding: 1.05em 1.7em;
  border-radius: 100px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-size: var(--fs-small);
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--t-fast) var(--e-out),
              box-shadow var(--t-mid) var(--e-out),
              color var(--t-fast) linear;
}
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--btn-hover);
  transform: translateY(101%);
  transition: transform var(--t-mid) var(--e-out);
}
.btn:hover { transform: translateY(-2px); }
.btn:hover::before { transform: translateY(0); }
.btn:active { transform: translateY(0); }

.btn--primary:hover { color: var(--ink); box-shadow: 0 14px 44px -14px var(--signal-glow); }

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--fg);
  --btn-hover: var(--fg);
  box-shadow: inset 0 0 0 1px var(--line);
}
.btn--ghost:hover { color: var(--bg); }

.btn--solid-ink { --btn-bg: var(--ink); --btn-fg: var(--on-ink); --btn-hover: var(--signal); }
.btn--solid-ink:hover { color: #fff; }

.btn__arrow { flex: none; transition: transform var(--t-mid) var(--e-out); }
.btn:hover .btn__arrow { transform: translateX(4px); }

.btn--lg { padding: 1.2em 2em; font-size: 0.95rem; }
.btn--block { display: flex; width: 100%; }

.btn-row { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding-bottom: 2px;
  font-weight: 500;
  color: var(--fg);
}
.link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform-origin: right;
  transition: transform var(--t-mid) var(--e-out);
}
.link:hover::after { transform: scaleX(0); transform-origin: left; }
.link--accent { color: var(--accent-text); }

/* --------------------------------------------------------------------------
   6. MOTION — reveals (JS adds .is-in when the element enters the viewport)
   -------------------------------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translate3d(0, var(--reveal-y, 22px), 0);
  transition: opacity 0.85s var(--e-out) var(--reveal-delay, 0ms),
              transform 0.95s var(--e-out) var(--reveal-delay, 0ms);
}
[data-reveal].is-in { opacity: 1; transform: translate3d(0, 0, 0); }
[data-reveal="fade"] { --reveal-y: 0px; }

/* Line-by-line headline reveal */
.reveal-lines .rl-line { display: block; overflow: hidden; padding-bottom: 0.06em; margin-bottom: -0.06em; }
.reveal-lines .rl-inner {
  display: block;
  transform: translate3d(0, 105%, 0);
  transition: transform 1.05s var(--e-out) var(--rl-delay, 0ms);
}
.reveal-lines.is-in .rl-inner { transform: translate3d(0, 0, 0); }

/* No-JS safety net: content must never stay invisible. */
.no-js [data-reveal] { opacity: 1; transform: none; }
.no-js .reveal-lines .rl-inner { transform: none; }

/* --------------------------------------------------------------------------
   7. REDUCED MOTION
   -------------------------------------------------------------------------- */
@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;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .reveal-lines .rl-inner { transform: none !important; }
}