/* ─── Emoji Memory · Code 3 Workshop ─── */
/* Design tokens aligned with homepage / CardioStrip */

:root {
  /* White · EMS blue · Gold */
  --bg: #f3f6fb;
  --bg-elevated: #ffffff;
  --bg-panel: rgba(255, 255, 255, 0.92);
  --bg-card: #ffffff;
  --bg-card-hover: #eef3fa;
  --border: rgba(0, 63, 135, 0.12);
  --border-strong: rgba(0, 63, 135, 0.22);
  --text: #0b1f3a;
  --text-muted: #4a5f78;
  --text-dim: #6b7f96;
  --accent: #c9a227;
  --accent-soft: #e8d48b;
  --accent-dim: rgba(201, 162, 39, 0.14);
  --accent-glow: rgba(201, 162, 39, 0.32);
  --cyan: #0057b8;
  --cyan-dim: rgba(0, 87, 184, 0.1);
  --amber: #c9a227;
  --amber-dim: rgba(201, 162, 39, 0.14);
  --rose: #c43c4e;
  --violet: #3d5a80;
  --violet-dim: rgba(61, 90, 128, 0.1);
  --success: #1a8f5c;
  --ems: #003f87;
  --ems-mid: #0057b8;
  --ems-light: #2b7fd4;
  --gold: #c9a227;
  --gold-bright: #d4af37;
  --gold-soft: #f5e9c0;
  --surface: rgba(0, 63, 135, 0.04);
  --surface-hover: rgba(0, 63, 135, 0.07);
  --radius: 16px;
  --radius-sm: 12px;
  --radius-xs: 9px;
  --shadow: 0 12px 40px rgba(0, 63, 135, 0.1);
  --shadow-soft: 0 6px 20px rgba(0, 63, 135, 0.08);
  --font: "DM Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --content-max: 720px;
  --card-flip: 0.45s;
}

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

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: rgba(201, 162, 39, 0.35);
  color: #0b1f3a;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

.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;
}

/* Author display rules (e.g. .setup-panel { display:flex }) must not
   override the hidden attribute — force it off the layout. */
[hidden] {
  display: none !important;
}

.mono {
  font-family: var(--mono);
}

/* ─── Ambient background ─── */

.bg-fx {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  animation: orb-drift 18s var(--ease) infinite alternate;
}

.bg-orb-a {
  width: 520px;
  height: 520px;
  top: -12%;
  left: -8%;
  background: radial-gradient(circle, rgba(0, 87, 184, 0.18), transparent 68%);
}

.bg-orb-b {
  width: 460px;
  height: 460px;
  top: -8%;
  right: -6%;
  background: radial-gradient(circle, rgba(201, 162, 39, 0.18), transparent 68%);
  animation-delay: -6s;
}

.bg-orb-c {
  width: 480px;
  height: 480px;
  bottom: -18%;
  left: 35%;
  background: radial-gradient(circle, rgba(201, 162, 39, 0.12), transparent 70%);
  animation-delay: -11s;
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 63, 135, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 63, 135, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 20%, transparent 75%);
}

.bg-noise {
  position: absolute;
  inset: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
}

@keyframes orb-drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(30px, 24px) scale(1.08); }
}

/* ─── App shell ─── */

.app {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Header ─── */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.5rem;
  min-height: var(--header-h);
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px) saturate(1.3);
  -webkit-backdrop-filter: blur(18px) saturate(1.3);
  position: sticky;
  top: 0;
  z-index: 40;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-mark {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  filter: drop-shadow(0 0 14px var(--accent-glow));
  transition: transform 0.35s var(--ease), filter 0.35s var(--ease);
}

.brand:hover .brand-mark {
  transform: scale(1.04) rotate(-2deg);
  filter: drop-shadow(0 0 20px var(--accent-glow));
}

.brand-mark img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand-text h1 {
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  background: linear-gradient(135deg, var(--ems) 0%, var(--ems-mid) 55%, var(--gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand-text p {
  font-size: 0.76rem;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

.header-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: flex-end;
}

.pill {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0.38rem 0.75rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  backdrop-filter: blur(8px);
  max-width: min(100%, 28rem);
  text-align: center;
  line-height: 1.35;
  white-space: normal;
}

.pill-accent {
  color: var(--accent);
  background: var(--accent-dim);
  border-color: rgba(201, 162, 39, 0.28);
  box-shadow: 0 0 20px rgba(201, 162, 39, 0.1);
}

/* ─── Main ─── */

.main {
  flex: 1;
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ─── Glass panel ─── */

.glass-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px) saturate(1.15);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
  overflow: hidden;
  position: relative;
}

.glass-panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(201, 162, 39, 0.25), transparent);
  pointer-events: none;
  z-index: 1;
}

.title-kicker {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 0.45rem;
}

/* ─── Setup screen ─── */

.setup-panel {
  padding: 2rem 2rem 2.15rem;
  background:
    linear-gradient(180deg, rgba(0, 63, 135, 0.045), transparent 50%),
    linear-gradient(180deg, #ffffff, #f7f9fd);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.35rem;
}

.setup-panel h2 {
  font-size: clamp(1.6rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 0.35rem;
}

.setup-lead {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 36ch;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.difficulty-block {
  width: 100%;
  max-width: 28rem;
  margin-bottom: 1.5rem;
}

.field-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.65rem;
  text-align: left;
}

.difficulty-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.65rem;
}

.diff-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.2rem;
  padding: 0.9rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow-soft);
  text-align: left;
  transition:
    border-color 0.2s var(--ease),
    background 0.2s var(--ease),
    box-shadow 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.diff-btn:hover {
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
  transform: translateY(-1px);
}

.diff-btn:focus-visible {
  outline: 2px solid var(--ems-mid);
  outline-offset: 2px;
}

.diff-btn.is-active {
  border-color: rgba(0, 87, 184, 0.45);
  background: linear-gradient(180deg, rgba(0, 87, 184, 0.08), rgba(201, 162, 39, 0.06));
  box-shadow: 0 0 0 1px rgba(0, 87, 184, 0.12), var(--shadow-soft);
}

.diff-btn.is-active .diff-name {
  color: var(--ems);
}

.diff-name {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.diff-meta {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

/* ─── Buttons ─── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  padding: 0.7rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  transition:
    background 0.2s var(--ease),
    border-color 0.2s var(--ease),
    color 0.2s var(--ease),
    box-shadow 0.2s var(--ease),
    transform 0.2s var(--ease),
    gap 0.2s var(--ease);
}

.btn:focus-visible {
  outline: 2px solid var(--ems-mid);
  outline-offset: 3px;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--ems) 0%, var(--ems-mid) 100%);
  box-shadow: 0 8px 24px rgba(0, 63, 135, 0.28);
}

.btn-primary:hover {
  gap: 0.6rem;
  box-shadow: 0 10px 28px rgba(0, 63, 135, 0.34);
  filter: brightness(1.05);
}

.btn-lg {
  padding: 0.9rem 1.6rem;
  font-size: 1rem;
}

.btn-secondary {
  color: var(--ems);
  background: var(--surface);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: rgba(0, 63, 135, 0.3);
}

.btn-ghost {
  color: var(--text-muted);
  background: transparent;
  border-color: var(--border);
  padding: 0.5rem 0.9rem;
  font-size: 0.82rem;
}

.btn-ghost:hover {
  color: var(--ems);
  background: var(--surface);
  border-color: var(--border-strong);
}

/* ─── HUD ─── */

.hud {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  padding: 0.85rem 1.15rem;
}

.hud-stat {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 4.5rem;
}

.hud-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.hud-value {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ems);
  line-height: 1.2;
}

.hud-total {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
}

.hud-actions {
  display: flex;
  gap: 0.45rem;
  margin-left: auto;
}

/* ─── Play screen ─── */

.screen-play {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

.screen-play[hidden] {
  display: none !important;
}

/* ─── Board ─── */

.board {
  display: grid;
  gap: 0.65rem;
  width: 100%;
  perspective: 1000px;
  -webkit-perspective: 1000px;
}

.board[data-cols="3"] {
  grid-template-columns: repeat(3, 1fr);
}

.board[data-cols="4"] {
  grid-template-columns: repeat(4, 1fr);
}

.board[data-cols="6"] {
  grid-template-columns: repeat(4, 1fr);
}

@media (min-width: 560px) {
  .board[data-cols="6"] {
    grid-template-columns: repeat(6, 1fr);
  }
}

/* ─── Cards ─── */
/* Card button sizes via aspect-ratio; inner must fill with absolute inset
   (height:100% collapses when the only children are position:absolute). */

.card {
  position: relative;
  aspect-ratio: 1;
  width: 100%;
  min-width: 0;
  min-height: 0;
  border: none;
  padding: 0;
  background: transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  perspective: 800px;
  -webkit-perspective: 800px;
}

.card:focus-visible {
  outline: 2px solid var(--ems-mid);
  outline-offset: 3px;
  border-radius: calc(var(--radius-sm) + 2px);
}

.card:disabled {
  cursor: default;
}

.card-inner {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: transform var(--card-flip) var(--ease);
  border-radius: var(--radius-sm);
}

.card.is-flipped .card-inner,
.card.is-matched .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  /* Force a containing box for absolute fill */
  width: 100%;
  height: 100%;
}

.card-back {
  background:
    linear-gradient(145deg, var(--ems) 0%, var(--ems-mid) 55%, #004a9e 100%);
  color: var(--gold-bright);
  overflow: hidden;
  transform: rotateY(0deg);
}

.card-back::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 12px 12px;
  opacity: 0.7;
  pointer-events: none;
}

.card-back::after {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: calc(var(--radius-xs) - 2px);
  border: 1px solid rgba(212, 175, 55, 0.35);
  pointer-events: none;
}

.card-mark {
  position: relative;
  z-index: 1;
  font-family: var(--mono);
  font-size: clamp(0.85rem, 3.5vw, 1.15rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold-bright);
  text-shadow: 0 0 18px var(--accent-glow);
}

.card-front {
  background: linear-gradient(180deg, #ffffff, #f4f7fc);
  transform: rotateY(180deg);
  font-size: clamp(1.6rem, 7vw, 2.4rem);
  line-height: 1;
}

.card:not(:disabled):not(.is-flipped):not(.is-matched):hover .card-face.card-back {
  box-shadow: 0 8px 24px rgba(0, 63, 135, 0.22);
  filter: brightness(1.06);
}

.card.is-matched .card-front {
  border-color: rgba(26, 143, 92, 0.35);
  background: linear-gradient(180deg, #f3fbf7, #e8f6ef);
  box-shadow: 0 0 0 1px rgba(26, 143, 92, 0.15), var(--shadow-soft);
  animation: match-pop 0.45s var(--ease);
}

.card.is-mismatch .card-front {
  border-color: rgba(196, 60, 78, 0.4);
  animation: shake 0.4s var(--ease);
}

@keyframes match-pop {
  0% { transform: rotateY(180deg) scale(1); }
  40% { transform: rotateY(180deg) scale(1.06); }
  100% { transform: rotateY(180deg) scale(1); }
}

@keyframes shake {
  0%, 100% { transform: rotateY(180deg) translateX(0); }
  25% { transform: rotateY(180deg) translateX(-4px); }
  75% { transform: rotateY(180deg) translateX(4px); }
}

/* ─── Modal ─── */

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 1.25rem;
}

.modal[hidden] {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(11, 31, 58, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: fade-in 0.25s var(--ease);
}

.modal-card {
  position: relative;
  z-index: 1;
  width: min(100%, 400px);
  padding: 1.75rem 1.6rem 1.6rem;
  text-align: center;
  animation: modal-up 0.35s var(--ease);
}

.win-badge {
  font-size: 2.5rem;
  line-height: 1;
  margin-bottom: 0.5rem;
  filter: drop-shadow(0 6px 12px rgba(201, 162, 39, 0.25));
}

.modal-card h2 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.45rem;
}

.win-summary {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.15rem;
  line-height: 1.5;
}

.win-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-bottom: 1.4rem;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
}

.win-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.win-stats span {
  font-family: var(--mono);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.win-stats strong {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ems);
}

.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.modal-actions .btn {
  width: 100%;
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes modal-up {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ─── Responsive ─── */

@media (max-width: 720px) {
  .header {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.9rem 1.1rem;
  }

  .header-meta {
    justify-content: flex-start;
  }

  .main {
    padding: 1.35rem 1.1rem 2.25rem;
  }

  .setup-panel {
    padding: 1.5rem 1.2rem 1.65rem;
  }

  .difficulty-group {
    grid-template-columns: 1fr;
  }

  .hud {
    padding: 0.75rem 0.9rem;
  }

  .hud-actions {
    width: 100%;
    margin-left: 0;
    justify-content: flex-end;
  }

  .board {
    gap: 0.5rem;
  }
}

@media (max-width: 380px) {
  .board[data-cols="4"],
  .board[data-cols="6"] {
    grid-template-columns: repeat(3, 1fr);
  }

  .card-front {
    font-size: 1.45rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bg-orb {
    animation: none;
  }

  .card-inner,
  .diff-btn,
  .btn,
  .brand-mark,
  .modal-backdrop,
  .modal-card {
    transition: none;
    animation: none;
  }

  .card.is-matched .card-front,
  .card.is-mismatch .card-front {
    animation: none;
  }
}