/* BlindWar — design tokens + reset. Mobile first. */

:root {
  color-scheme: light;

  /* surface */
  --bg: #fbfbfd;
  --surface: #ffffff;

  /* ink */
  --ink: #12141a;
  --ink-soft: #7c8593;
  --ink-mid: #646d7c;
  --line: #e8eaee;
  --ink-inverse: #ffffff;
  --ink-inverse-soft: rgba(255, 255, 255, .72);

  /* board colours (also used for the drifting background grids) */
  --c-red: #e2566a;
  --c-blue: #6aa3ef;
  --c-green: #57c184;
  --c-purple: #ab86e4;

  /* the same four colours as flat tile fills */
  --c-red-soft: #fde9eb;    --c-red-line: #f7d3d8;
  --c-blue-soft: #e6effd;   --c-blue-line: #d2e2fa;
  --c-green-soft: #e4f7ec;  --c-green-line: #cdeddb;
  --c-purple-soft: #f1eafc; --c-purple-line: #e3d7f7;
  --c-blue-ink: #2a74e6;   /* readable blue for text on --c-blue-soft */
  --c-blue-btn: #4a90f2;   /* solid primary button */
  --c-green-ink: #1ba75a;
  --c-red-ink: #e03b4e;

  /* vivid player colours — the glossy balls */
  --ball-red: #f0393f;
  --ball-blue: #2f7df0;
  --ball-green: #21c45d;
  --ball-purple: #9b2ff0;

  /* shape */
  --radius-btn: 18px;
  --radius-card: 24px;
  --radius-tile: 16px;
  --shadow-btn: 0 1px 2px rgba(17, 24, 39, .06), 0 6px 18px rgba(17, 24, 39, .09);
  --shadow-btn-press: 0 1px 2px rgba(17, 24, 39, .08);

  /* safe areas, used by every screen */
  --sat: env(safe-area-inset-top, 0px);
  --sab: env(safe-area-inset-bottom, 0px);
  --sal: env(safe-area-inset-left, 0px);
  --sar: env(safe-area-inset-right, 0px);
}

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

html,
body {
  height: 100%;
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
    Inter, "Helvetica Neue", Roboto, Arial, sans-serif;
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overscroll-behavior: none;
}

/* the whole thing is a fixed-viewport app, never a scrolling document */
body {
  overflow: hidden;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
  color: inherit;
  margin: 0;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

svg { display: block; }

/* any class that sets `display` would otherwise beat the UA's [hidden] rule */
[hidden] { display: none !important; }

:focus-visible {
  outline: 3px solid rgba(18, 20, 26, .35);
  outline-offset: 3px;
}

.app {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100svh;
  height: 100dvh;
  overflow: hidden;
  isolation: isolate;
}

/* ── Screens ────────────────────────────────────────────────────────────
   Every screen fills the app; exactly one carries .is-active.          */

.screen {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .26s ease, transform .3s cubic-bezier(.2, .8, .3, 1),
    visibility .3s;
}

.screen.is-active {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* Vertically centres content that fits, scrolls it when it doesn't. */
.screen__inner {
  width: 100%;
  margin-block: auto;
}

/* Screens that stack content under the wordmark (modes, search, ...) */
.screen--stack {
  justify-content: flex-start;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding:
    calc(var(--sat) + clamp(64px, 8.5vh, 94px))
    calc(var(--sar) + 18px)
    calc(var(--sab) + 24px)
    calc(var(--sal) + 18px);
}

.screen--stack .screen__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(18px, 3vh, 32px);
}

/* ── Card surface, shared by every stacked screen ───────────────────── */

.cards {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2.2vh, 20px);
  width: 100%;
  max-width: 430px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 1.8vh, 16px);
  padding: clamp(14px, 2vh, 18px);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(17, 24, 39, .05), 0 10px 28px rgba(17, 24, 39, .085);
}

.card__head {
  display: flex;
  align-items: center;
  gap: clamp(10px, 3vw, 14px);
}

/* sized by height so the wide duo and the round globe read the same */
.card__icon {
  display: flex;
  align-items: center;
  flex: none;
}

.card__icon svg { height: clamp(26px, 7.4vw, 32px); width: auto; }
.card__icon--red { color: var(--c-red); }
.card__icon--ink { color: var(--ink); }

.card__title {
  margin: 0;
  font-size: clamp(19px, 5.5vw, 25px);
  font-weight: 750;
  letter-spacing: -.018em;
  line-height: 1.1;
}

.card__sub {
  margin: 3px 0 0;
  font-size: clamp(12px, 3.4vw, 14px);
  color: var(--ink-soft);
  line-height: 1.25;
}

/* ── Round icon button (back, and whatever comes next) ──────────────── */

.icon-btn {
  position: absolute;
  top: calc(var(--sat) + 14px);
  left: calc(var(--sal) + 16px);
  z-index: 2;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-btn);
  transition: transform .16s cubic-bezier(.2, .8, .3, 1), box-shadow .16s ease,
    background-color .16s ease, color .16s ease;
}

.icon-btn svg { width: 22px; height: 22px; }

/* the active screen is the scroll container, so pin the back button */
.screen.is-active .icon-btn { position: fixed; }

/* ── Action buttons, shared by every screen ────────────────────────────────────────────────────────── */

.action {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  min-height: clamp(48px, 6.8vh, 56px);
  margin-top: clamp(9px, 1.5vh, 13px);
  padding: 0 18px;
  border: 1.5px solid transparent;
  border-radius: 14px;
  font-size: clamp(15.5px, 4.4vw, 18px);
  font-weight: 700;
  letter-spacing: -.01em;
  transition: background-color .16s ease, border-color .16s ease,
    color .16s ease, transform .16s cubic-bezier(.2, .8, .3, 1), opacity .16s ease;
}

.action__icon { display: block; flex: none; }
.action__icon svg { width: clamp(18px, 5vw, 21px); height: auto; }
.action:active { transform: scale(.982); }

.action--primary {
  background: var(--c-blue-btn);
  color: var(--ink-inverse);
  box-shadow: 0 2px 10px rgba(74, 144, 242, .3);
}

.action--ghost {
  background: #f6faff;
  border-color: var(--line);
  color: var(--c-blue-ink);
}

/* empty-field nudge (keyframes in base.css) */
.hash-field.is-nudge { animation: nudge .3s ease; }

/* Start Match: white like the home menu, black only on hover/press. */
.action--white {
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-btn);
}

/* ── The black state: hover on a mouse, press on a finger ───────────── */

.btn:active, .btn.is-pressed,
.tile:active, .tile.is-pressed,
.friend:active, .friend.is-pressed,
.cta:active, .cta.is-pressed,
.action:active, .action.is-pressed,
.send:active, .send.is-pressed,
.icon-btn:active, .icon-btn.is-pressed {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--ink-inverse);
}

@media (hover: hover) {
  .btn:hover,
  .tile:hover,
  .friend:hover,
  .cta:hover,
  .action:hover,
  .send:hover,
  .icon-btn:hover {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--ink-inverse);
  }
}

@media (prefers-reduced-motion: reduce) {
  .screen { transition: opacity .01s; transform: none; }
}

/* Shared nudge: "you missed this bit" without a modal. */
@keyframes nudge {
  0%, 100% { translate: 0; }
  25% { translate: -5px; }
  60% { translate: 4px; }
}