/* ============================================================
   Severed Signal Studios — site styles
   Art direction: Vostrenian state bureaucracy, 1983, seen
   through a PlayStation 1. Flat fills, dithered gradients,
   hard edges, institutional palette. Committed dark theme.
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  color-scheme: dark;

  /* Palette. Desaturated, institutional, slightly sick. */
  --ink:          #0a0c0b;
  --ink-raised:   #121614;
  --ink-card:     #171c19;
  --concrete:     #2a302c;
  --concrete-lit: #3d443e;
  --grout:        #545c53;

  --paper:        #d9d0bb;
  --paper-dim:    #a9a292;
  --paper-faint:  #7b7568;

  --state-red:    #b8402f;
  --state-red-lit:#d8574320;
  --stamp:        #a5382a;
  --amber:        #d9a441;
  --amber-dim:    #8d6c2c;
  --phosphor:     #8fbf8a;

  /* Type */
  --font-display: "IBM Plex Sans Condensed", "Archivo Narrow", "Arial Narrow", system-ui, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;

  --step--1: clamp(0.75rem, 0.72rem + 0.15vw, 0.82rem);
  --step-0:  clamp(0.9rem, 0.86rem + 0.2vw, 1rem);
  --step-1:  clamp(1.05rem, 0.98rem + 0.35vw, 1.25rem);
  --step-2:  clamp(1.3rem, 1.1rem + 0.9vw, 1.75rem);
  --step-3:  clamp(1.7rem, 1.3rem + 1.9vw, 2.75rem);
  --step-4:  clamp(2.4rem, 1.4rem + 4.6vw, 5.5rem);

  /* Space */
  --sp-1: 0.375rem;
  --sp-2: 0.75rem;
  --sp-3: 1.25rem;
  --sp-4: 2rem;
  --sp-5: 3.25rem;
  --sp-6: 5rem;
  --sp-7: 7.5rem;

  --measure: 64ch;
  --edge: clamp(1.15rem, 4vw, 3.5rem);
  --maxw: 1240px;

  --rule: 1px solid var(--concrete);
  --rule-lit: 1px solid var(--concrete-lit);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@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 {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--step-0);
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
/* height:auto is load-bearing: the key art carries width/height attributes,
   and without it the box keeps its intrinsic 900px height and letterboxes
   the artwork inside, leaving a huge dead gap in the hero. */
img, svg { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: 0.005em;
  text-transform: uppercase;
  margin: 0;
  text-wrap: balance;
}
p { margin: 0 0 var(--sp-3); max-width: var(--measure); text-wrap: pretty; }
a { color: var(--amber); text-underline-offset: 0.25em; text-decoration-thickness: 1px; }
a:hover { color: var(--paper); }
ul, ol { margin: 0 0 var(--sp-3); padding-left: 1.15em; }
li { margin-bottom: var(--sp-1); }
hr { border: 0; border-top: var(--rule); margin: var(--sp-5) 0; }

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

/* ---------- Skip link ---------- */
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--amber); color: var(--ink);
  padding: var(--sp-2) var(--sp-3);
  font-weight: 600; text-decoration: none;
}
.skip:focus { left: var(--sp-2); top: var(--sp-2); }

/* ---------- Texture overlays ---------- */
/* Scanlines + grain, fixed over everything, pointer-transparent. */
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 60;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.22) 0 1px,
    rgba(0, 0, 0, 0) 1px 3px
  );
  mix-blend-mode: multiply;
  opacity: 0.55;
}
.grain {
  position: fixed; inset: -50%;
  pointer-events: none;
  z-index: 61;
  opacity: 0.05;
  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='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 900ms steps(3) infinite;
}
@keyframes grain {
  0%   { transform: translate(0, 0); }
  33%  { transform: translate(-3%, 2%); }
  66%  { transform: translate(2%, -3%); }
  100% { transform: translate(0, 0); }
}
@media (prefers-reduced-motion: reduce) { .grain { animation: none; } }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--edge); }
.section { padding-block: var(--sp-6); border-top: var(--rule); }
.section--flush { border-top: 0; }
.stack > * + * { margin-top: var(--sp-3); }

/* Section label — a bureaucratic file tag. */
.eyebrow {
  font-size: var(--step--1);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper-faint);
  font-weight: 600;
  margin: 0 0 var(--sp-2);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.eyebrow::before {
  content: "";
  width: 1.75rem; height: 1px;
  background: var(--state-red);
  flex: none;
}

/* ---------- Header ---------- */
.masthead {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--ink) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: var(--rule);
}
.masthead__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-3);
  min-height: 62px;
}
.brand {
  display: inline-flex; align-items: center; gap: 0.6rem;
  color: var(--paper); text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; font-size: 0.95rem;
  white-space: nowrap;
}
.brand:hover { color: var(--amber); }
.brand svg { width: 26px; height: 26px; flex: none; }
.nav { display: flex; align-items: center; gap: clamp(0.9rem, 2.5vw, 1.9rem); }
.nav a {
  color: var(--paper-dim); text-decoration: none;
  font-size: var(--step--1); letter-spacing: 0.14em;
  text-transform: uppercase; font-weight: 500;
  padding-block: 0.5rem;
  border-bottom: 1px solid transparent;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--paper); border-bottom-color: var(--state-red); }
@media (max-width: 640px) {
  .nav a[data-optional] { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.5rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid var(--state-red);
  background: var(--state-red);
  color: #f6efe2;
  cursor: pointer;
  transition: transform 90ms steps(2), background-color 120ms, color 120ms;
}
.btn:hover { background: #cf4a36; color: #fff; transform: translate(-1px, -1px); }
.btn:active { transform: translate(0, 0); }
.btn--ghost {
  background: transparent; border-color: var(--concrete-lit); color: var(--paper);
}
.btn--ghost:hover { background: var(--concrete); border-color: var(--paper-faint); color: var(--paper); }
.btn[aria-disabled="true"] {
  background: transparent; border-color: var(--concrete); color: var(--paper-faint);
  cursor: not-allowed; pointer-events: none;
}
.btn-row { display: flex; flex-wrap: wrap; gap: var(--sp-2); align-items: center; }

/* ---------- Hero ---------- */
.hero { position: relative; border-bottom: var(--rule); overflow: hidden; }
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  padding-block: clamp(2.5rem, 7vw, 5.5rem);
}
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; gap: var(--sp-4); }
  .hero__art { order: -1; }
}
.hero__kicker {
  font-size: var(--step--1);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--state-red);
  font-weight: 600;
  margin-bottom: var(--sp-3);
}
.hero__title {
  font-size: var(--step-4);
  margin-bottom: var(--sp-3);
  letter-spacing: -0.005em;
}
.hero__title span { display: block; color: var(--amber); }
.hero__hook {
  font-size: var(--step-1);
  color: var(--paper);
  line-height: 1.55;
  max-width: 34ch;
  margin-bottom: var(--sp-3);
}
.hero__sub { color: var(--paper-dim); max-width: 46ch; }

/* Status chip */
.chip {
  display: inline-flex; align-items: center; gap: 0.5rem;
  border: 1px solid var(--concrete-lit);
  padding: 0.35rem 0.75rem;
  font-size: var(--step--1);
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--paper-dim);
  margin-bottom: var(--sp-3);
}
.chip::before {
  content: ""; width: 7px; height: 7px; background: var(--amber);
  animation: blink 2.4s steps(1) infinite;
}
@keyframes blink { 0%, 60% { opacity: 1; } 61%, 100% { opacity: 0.25; } }

/* ---------- Cards / panels ---------- */
.panel {
  background: var(--ink-card);
  border: var(--rule);
  padding: clamp(1.15rem, 3vw, 2rem);
}
.panel--paper {
  background: var(--paper);
  color: #16130d;
  border-color: #b3a894;
}
.grid { display: grid; gap: var(--sp-3); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }

/* Numbered steps — the core loop */
.loop { counter-reset: step; }
.loop__item {
  position: relative;
  border-top: var(--rule);
  padding: var(--sp-3) 0 var(--sp-3) clamp(3rem, 8vw, 5rem);
}
.loop__item::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute; left: 0; top: var(--sp-3);
  font-family: var(--font-display);
  font-size: var(--step-2);
  color: var(--state-red);
  line-height: 1;
}
.loop__item h3 {
  font-size: var(--step-1);
  letter-spacing: 0.1em;
  margin-bottom: var(--sp-1);
}
.loop__item p { color: var(--paper-dim); margin: 0; }

/* Fact rows — press kit / spec tables */
.facts { border-top: var(--rule); }
.facts__row {
  display: grid;
  grid-template-columns: minmax(9rem, 15rem) 1fr;
  gap: var(--sp-2) var(--sp-3);
  padding: var(--sp-2) 0;
  border-bottom: var(--rule);
  align-items: baseline;
}
@media (max-width: 560px) { .facts__row { grid-template-columns: 1fr; gap: 0; } }
.facts__k {
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper-faint);
  font-weight: 600;
}
.facts__v { color: var(--paper); }
.facts__v p:last-child { margin-bottom: 0; }

/* Influence tiles */
.infl {
  border: var(--rule);
  padding: var(--sp-3);
  background: var(--ink-raised);
}
.infl h3 { font-size: var(--step-0); letter-spacing: 0.08em; color: var(--paper); margin-bottom: var(--sp-1); }
.infl p { font-size: var(--step--1); color: var(--paper-dim); margin: 0; line-height: 1.65; }

/* ---------- Stamp ---------- */
.stamp {
  display: inline-block;
  border: 2px solid var(--stamp);
  color: var(--stamp);
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  padding: 0.3rem 0.85rem;
  transform: rotate(-4deg);
  font-size: var(--step--1);
  opacity: 0.9;
}
.stamp--ok { border-color: var(--phosphor); color: var(--phosphor); }

/* ---------- Newsletter ---------- */
.signup { background: var(--ink-raised); border: var(--rule); padding: clamp(1.25rem, 4vw, 2.75rem); }
.form-row { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-top: var(--sp-3); max-width: 34rem; }
.form-row input[type="email"] {
  flex: 1 1 16rem;
  background: var(--ink);
  border: 1px solid var(--concrete-lit);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--step-0);
  padding: 0.8rem 1rem;
}
.form-row input::placeholder { color: var(--paper-faint); }
.form-row input:focus-visible { border-color: var(--amber); }
.form-note { font-size: var(--step--1); color: var(--paper-faint); margin: var(--sp-2) 0 0; }
.form-status { font-size: var(--step--1); margin: var(--sp-2) 0 0; min-height: 1.5em; }
.form-status[data-state="ok"] { color: var(--phosphor); }
.form-status[data-state="err"] { color: var(--state-red); }

/* ---------- Footer ---------- */
.foot { border-top: var(--rule); padding-block: var(--sp-5); color: var(--paper-faint); }
.foot a { color: var(--paper-dim); text-decoration: none; }
.foot a:hover { color: var(--amber); text-decoration: underline; }
.foot__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); gap: var(--sp-4); }
.foot h4 { font-size: var(--step--1); letter-spacing: 0.18em; color: var(--paper-dim); margin-bottom: var(--sp-2); }
.foot ul { list-style: none; padding: 0; margin: 0; }
.foot li { margin-bottom: var(--sp-1); font-size: var(--step--1); }
.foot__legal { margin-top: var(--sp-5); padding-top: var(--sp-3); border-top: var(--rule); font-size: var(--step--1); display: flex; flex-wrap: wrap; gap: var(--sp-3); justify-content: space-between; }

/* ---------- Utilities ---------- */
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.muted { color: var(--paper-dim); }
.faint { color: var(--paper-faint); }
.mono-label {
  font-size: var(--step--1); letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--paper-faint); font-weight: 600;
}
.lede { font-size: var(--step-1); line-height: 1.6; color: var(--paper); }
.center-narrow { max-width: 58ch; margin-inline: auto; }

/* ============================================================
   Key art — the block in elevation
   The building IS the puzzle grid: 9 apartments, lobby,
   basement. Rendered flat with dithered bands, PSX style.
   ============================================================ */
.block-art { position: relative; width: 100%; }
.block-art svg { width: 100%; height: auto; shape-rendering: crispEdges; }

/* Windows react on hover/focus — a hint that the block is the interface. */
.block-art .unit { cursor: default; }
.block-art .unit rect.glass { transition: fill 140ms steps(2); }
.block-art .unit:hover rect.glass,
.block-art .unit:focus-visible rect.glass { fill: var(--amber); }
.block-art .unit:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

/* The severed signal: antenna flicker */
.antenna-arc { animation: sever 6s steps(1) infinite; }
@keyframes sever {
  0%, 78%  { opacity: 0; }
  80%, 82% { opacity: 1; }
  83%, 88% { opacity: 0; }
  90%      { opacity: 0.7; }
  92%, 100%{ opacity: 0; }
}
@media (prefers-reduced-motion: reduce) { .antenna-arc { animation: none; opacity: 0.5; } }

/* ============================================================
   Deduction teaser — a real, tiny slice of the core loop
   ============================================================ */
.ded {
  background: var(--ink-raised);
  border: var(--rule);
  padding: clamp(1.15rem, 3.5vw, 2.25rem);
}
.ded__head { display: flex; flex-wrap: wrap; gap: var(--sp-2); align-items: baseline; justify-content: space-between; margin-bottom: var(--sp-3); }
.ded__title { font-size: var(--step-1); letter-spacing: 0.1em; }
.ded__layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(1rem, 3vw, 2.5rem); align-items: start; }
@media (max-width: 780px) { .ded__layout { grid-template-columns: 1fr; } }

.clues { list-style: none; padding: 0; margin: 0; counter-reset: clue; }
.clues li {
  position: relative;
  padding: var(--sp-2) 0 var(--sp-2) 2.25rem;
  border-bottom: var(--rule);
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--paper-dim);
}
.clues li::before {
  counter-increment: clue;
  content: counter(clue);
  position: absolute; left: 0; top: var(--sp-2);
  font-size: var(--step--1);
  color: var(--state-red);
  font-weight: 600;
  border: 1px solid var(--concrete-lit);
  width: 1.5rem; height: 1.5rem;
  display: grid; place-items: center;
  line-height: 1;
}

/* The register — where you write your answer */
.register { border: var(--rule); background: var(--ink); }
.register__row {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-2);
  border-bottom: var(--rule);
}
.register__row:last-of-type { border-bottom: 0; }
.register__door {
  font-family: var(--font-display);
  font-size: var(--step-1);
  color: var(--paper);
  letter-spacing: 0.06em;
  border-right: var(--rule);
  padding-right: var(--sp-2);
}
.register select {
  width: 100%;
  background: var(--ink-card);
  border: 1px solid var(--concrete-lit);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--step-0);
  padding: 0.6rem 0.7rem;
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--paper-faint) 50%),
                    linear-gradient(135deg, var(--paper-faint) 50%, transparent 50%);
  background-position: calc(100% - 18px) 55%, calc(100% - 13px) 55%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}
.register select:focus-visible { border-color: var(--amber); }
.register__row[data-verdict="wrong"] select { border-color: var(--state-red); }
.register__row[data-verdict="right"] select { border-color: var(--phosphor); }

.ded__actions { display: flex; flex-wrap: wrap; gap: var(--sp-2); align-items: center; margin-top: var(--sp-3); }
.ded__verdict { font-size: var(--step--1); line-height: 1.6; min-height: 3em; margin-top: var(--sp-2); }
.ded__verdict strong { display: block; font-family: var(--font-display); font-size: var(--step-1); letter-spacing: 0.12em; margin-bottom: 0.2rem; }
.ded__verdict[data-state="pass"] strong { color: var(--phosphor); }
.ded__verdict[data-state="fail"] strong { color: var(--state-red); }

/* ---------- Utility classes ----------
   These exist so no page needs a style attribute, which in turn lets
   the Content-Security-Policy drop 'unsafe-inline' for styles. */
.h2-lg { font-size: var(--step-3); }
.h2-md { font-size: var(--step-2); }
.card-title { font-size: var(--step-2); margin: var(--sp-2) 0; }
.mb-2 { margin-bottom: var(--sp-2); }
.mb-3 { margin-bottom: var(--sp-3); }
.mb-4 { margin-bottom: var(--sp-4); }
.mt-2 { margin-top: var(--sp-2); }
.mt-3 { margin-top: var(--sp-3); }
.mt-4 { margin-top: var(--sp-4); }
.tiny { font-size: var(--step--1); }
.center { text-align: center; }
.mi-auto { margin-inline: auto; }
.measure-wide { max-width: 62ch; }
summary { cursor: pointer; }
details > summary:hover { color: var(--paper); }