/* ============================================================
   PION CHESS — Design System & Global Styles
   GameFi Chess on The Open Network (TON)
   ============================================================ */

/* ── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700;800;900&family=Rajdhani:wght@300;400;500;600;700&display=swap');

/* ── Design Tokens ────────────────────────────────────────── */
:root {
  /* Colors — Core */
  --bg-primary:        #0a0a0a;
  --bg-secondary:      #111111;
  --bg-tertiary:       #1a1a1a;
  --bg-elevated:       #1e1e1e;

  /* Colors — Accent */
  --accent:            #00ff88;
  --accent-dim:        #00cc6a;
  --accent-dark:       #009950;
  --accent-glow:       rgba(0, 255, 136, 0.15);
  --accent-glow-md:    rgba(0, 255, 136, 0.25);
  --accent-glow-lg:    rgba(0, 255, 136, 0.40);

  /* Colors — Text */
  --text-primary:      #e0e0e0;
  --text-secondary:    #888888;
  --text-muted:        #555555;
  --text-accent:       #00ff88;

  /* Colors — Semantic */
  --danger:            #ff4444;
  --danger-dim:        #cc3333;
  --danger-glow:       rgba(255, 68, 68, 0.20);
  --warning:           #ffaa00;
  --warning-glow:      rgba(255, 170, 0, 0.20);
  --info:              #4488ff;
  --info-glow:         rgba(68, 136, 255, 0.20);
  --success:           #00ff88;
  --success-glow:      rgba(0, 255, 136, 0.20);

  /* Colors — Chess Board */
  --board-light:       #1a2a1a;
  --board-dark:        #0d1a0d;
  --board-highlight:   rgba(0, 255, 136, 0.30);
  --board-selected:    rgba(0, 255, 136, 0.45);
  --board-lastmove:    rgba(0, 204, 106, 0.18);
  --board-check:       rgba(255, 68, 68, 0.40);
  --board-border:      #00ff88;

  /* Typography */
  --font-heading:      'Orbitron', sans-serif;
  --font-body:         'Rajdhani', sans-serif;
  --font-mono:         'Courier New', 'Consolas', monospace;

  /* Font Sizes */
  --fs-xs:    0.7rem;
  --fs-sm:    0.8rem;
  --fs-base:  1rem;
  --fs-md:    1.125rem;
  --fs-lg:    1.35rem;
  --fs-xl:    1.75rem;
  --fs-2xl:   2.25rem;
  --fs-3xl:   3rem;
  --fs-4xl:   4rem;

  /* Spacing */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-5:  1.25rem;
  --sp-6:  1.5rem;
  --sp-8:  2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;

  /* Borders & Radius */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  --border-color: rgba(0, 255, 136, 0.15);
  --border-color-md: rgba(0, 255, 136, 0.30);

  /* Shadows */
  --shadow-sm:   0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md:   0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg:   0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-xl:   0 16px 48px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(0, 255, 136, 0.25),
                 0 0 40px rgba(0, 255, 136, 0.10);
  --shadow-glow-lg: 0 0 30px rgba(0, 255, 136, 0.35),
                    0 0 60px rgba(0, 255, 136, 0.15),
                    0 0 100px rgba(0, 255, 136, 0.05);
  --shadow-danger: 0 0 20px rgba(255, 68, 68, 0.25);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.03);

  /* Glass */
  --glass-bg:     rgba(17, 17, 17, 0.70);
  --glass-bg-md:  rgba(17, 17, 17, 0.85);
  --glass-border: rgba(0, 255, 136, 0.10);
  --glass-blur:   16px;

  /* Transitions */
  --ease-out:    cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast:   150ms;
  --duration-base:   250ms;
  --duration-slow:   400ms;
  --duration-slower: 600ms;

  /* Z-index layers */
  --z-canvas:      -1;
  --z-scanline:    0;
  --z-content:     1;
  --z-navbar:      100;
  --z-overlay:     200;
  --z-modal:       300;
  --z-toast:       400;
  --z-tooltip:     500;

  /* Layout */
  --navbar-height: 64px;
  --max-width:     1200px;
  --board-max:     560px;
}


/* ── CSS Reset ────────────────────────────────────────────── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

img, svg, video, canvas {
  display: block;
  max-width: 100%;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--accent-dim);
}

button {
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
  color: inherit;
  font-size: inherit;
}

input, textarea, select {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  outline: none;
  border: none;
  background: none;
  color: var(--text-primary);
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}


/* ── Selection & Scrollbar ────────────────────────────────── */
::selection {
  background: var(--accent-glow-md);
  color: var(--accent);
}

::-moz-selection {
  background: var(--accent-glow-md);
  color: var(--accent);
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-dark);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-dim);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--accent-dark) var(--bg-primary);
}


/* ── Particle Canvas ──────────────────────────────────────── */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: var(--z-canvas);
  pointer-events: none;
}


/* ── CRT Scanline Overlay ─────────────────────────────────── */
.scanline-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-scanline);
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.08) 2px,
    rgba(0, 0, 0, 0.08) 4px
  );
  animation: scan-lines 8s linear infinite;
}


/* ── Navbar ───────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-6);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  z-index: var(--z-navbar);
  box-shadow: var(--shadow-md);
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--fs-lg);
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent-glow-md);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: text-shadow var(--duration-base) var(--ease-out);
  white-space: nowrap;
}

.navbar__logo:hover {
  text-shadow: var(--shadow-glow);
}

.navbar__logo-icon {
  font-size: var(--fs-xl);
  filter: drop-shadow(0 0 6px var(--accent-glow-lg));
}

.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.navbar__balance {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-heading);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  white-space: nowrap;
}

.navbar__balance-icon {
  font-size: var(--fs-md);
}

.navbar__balance-value {
  letter-spacing: 0.04em;
}

#wallet-connect-btn {
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: var(--bg-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: all var(--duration-base) var(--ease-out);
  box-shadow: var(--shadow-glow);
  white-space: nowrap;
}

#wallet-connect-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow-lg);
}

#wallet-connect-btn:active {
  transform: translateY(0);
}


/* ── Main Content ─────────────────────────────────────────── */
#app {
  position: relative;
  z-index: var(--z-content);
  padding-top: var(--navbar-height);
  min-height: 100vh;
}


/* ── Screen System ────────────────────────────────────────── */
.screen {
  display: none;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
  padding: var(--sp-6);
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: calc(100vh - var(--navbar-height));
}

.screen.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
  animation: fade-in var(--duration-slow) var(--ease-out);
}


/* ── Lobby Screen ─────────────────────────────────────────── */
.lobby__banner {
  text-align: center;
  padding: var(--sp-12) 0 var(--sp-10);
}

.lobby__title {
  font-size: var(--fs-3xl);
  font-weight: 900;
  color: var(--accent);
  text-shadow: 0 0 30px var(--accent-glow-md);
  margin-bottom: var(--sp-3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.lobby__subtitle {
  font-size: var(--fs-md);
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.05em;
}

.lobby__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-6);
  max-width: 820px;
  margin: 0 auto;
  padding: 0 var(--sp-4) var(--sp-12);
}

.lobby__card {
  position: relative;
  background: rgba(13, 13, 13, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-xl);
  padding: 24px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--duration-slow) var(--ease-spring);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.03);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Card Theme Variables */
.lobby__card--pvp {
  --card-theme-color: #00ff88;
  --card-glow-color: rgba(0, 255, 136, 0.35);
}

.lobby__card--practice {
  --card-theme-color: #bd5eff;
  --card-glow-color: rgba(189, 94, 255, 0.35);
}

.lobby__card--wallet {
  --card-theme-color: #ffaa00;
  --card-glow-color: rgba(255, 170, 0, 0.35);
}

.lobby__card--airdrop {
  --card-theme-color: #00e5ff;
  --card-glow-color: rgba(0, 229, 255, 0.35);
}

/* Outer Cyber Glow Frame */
.lobby__card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  border: 1.5px solid var(--card-theme-color);
  opacity: 0.15;
  transition: all var(--duration-base) var(--ease-out);
  pointer-events: none;
  z-index: 5;
}

/* Hover States */
.lobby__card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8), 
              0 0 35px var(--card-glow-color), 
              inset 0 0 15px rgba(255, 255, 255, 0.02);
}

.lobby__card:hover::after {
  opacity: 1;
  box-shadow: inset 0 0 15px var(--card-glow-color);
}

.lobby__card:active {
  transform: translateY(-3px);
  transition-duration: var(--duration-fast);
}

/* Card Header Components */
.card-header {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
  height: 24px;
  pointer-events: none;
}

.card-badge {
  position: absolute;
  top: -24px;
  left: -20px;
  font-family: var(--font-heading);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--card-theme-color);
  background: rgba(10, 10, 10, 0.95);
  border-right: 1.5px solid var(--card-theme-color);
  border-bottom: 1.5px solid var(--card-theme-color);
  padding: 5px 18px 5px 22px;
  border-top-left-radius: 14px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  text-transform: uppercase;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
  pointer-events: auto;
}

.card-icon-right {
  position: absolute;
  top: -20px;
  right: -12px;
  font-size: 14px;
  background: radial-gradient(circle, #ffe066 0%, #f59e0b 100%);
  border: 1.5px solid #ffffff;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.8);
  animation: pulse-trophy 2s infinite ease-in-out;
  pointer-events: auto;
}

@keyframes pulse-trophy {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); box-shadow: 0 0 18px rgba(245, 158, 11, 1); }
  100% { transform: scale(1); }
}

/* Card Image Styles */
.card-image-container {
  width: 100%;
  aspect-ratio: 1.45;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  margin: var(--sp-4) 0 var(--sp-4);
  background: #050505;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.8);
  position: relative;
}

.card-image-container::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,10,10,0.85) 0%, transparent 40%);
  pointer-events: none;
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.lobby__card:hover .card-img {
  transform: scale(1.08);
}

/* Card Typography */
.lobby__card-title {
  font-family: var(--font-heading);
  font-size: var(--fs-lg);
  font-weight: 800;
  color: #ffffff;
  margin-bottom: var(--sp-2);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: all var(--duration-base) var(--ease-out);
}

.lobby__card:hover .lobby__card-title {
  color: var(--card-theme-color);
  text-shadow: 0 0 15px var(--card-glow-color);
}

.lobby__card-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-bottom: var(--sp-6);
  min-height: 38px;
  max-width: 92%;
  margin-left: auto;
  margin-right: auto;
  transition: color var(--duration-base) var(--ease-out);
}

.lobby__card:hover .lobby__card-subtitle {
  color: var(--text-primary);
}

/* Button Component */
.card-btn-container {
  width: 100%;
  display: flex;
  justify-content: center;
  margin-top: auto;
}

.card-action-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 8px 22px;
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--card-theme-color);
  border: 1.5px solid var(--card-theme-color);
  background: rgba(0, 0, 0, 0.45);
  border-radius: var(--radius-full);
  transition: all var(--duration-base) var(--ease-out);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.card-action-btn .arrow {
  display: inline-block;
  transition: transform var(--duration-base) var(--ease-spring);
  font-weight: 900;
}

.lobby__card:hover .card-action-btn {
  background: var(--card-theme-color);
  color: #000000;
  box-shadow: 0 0 15px var(--card-glow-color);
}

.lobby__card:hover .card-action-btn .arrow {
  transform: translateX(4px);
}


/* ── Back Button ──────────────────────────────────────────── */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-secondary);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--sp-4);
}

.back-btn:hover {
  color: var(--accent);
  background: var(--accent-glow);
}


/* ── Game Screen (PvP & Practice) ─────────────────────────── */
.game-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-6);
  padding: var(--sp-4) 0;
}

.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--board-max);
  padding: var(--sp-3) var(--sp-4);
  background: var(--glass-bg-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.player-info {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.player-info__avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--accent-glow);
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-lg);
}

.player-info__name {
  font-family: var(--font-heading);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.03em;
}

.player-info__rating {
  font-size: var(--fs-xs);
  color: var(--text-secondary);
}

/* Timer Display */
.timer {
  font-family: var(--font-mono);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--text-primary);
  background: var(--bg-primary);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  min-width: 90px;
  text-align: center;
  letter-spacing: 0.08em;
  transition: color var(--duration-fast), border-color var(--duration-fast);
}

.timer--active {
  color: var(--accent);
  border-color: var(--accent-dim);
  box-shadow: 0 0 12px var(--accent-glow);
  animation: glow-pulse 2s ease-in-out infinite;
}

.timer--danger {
  color: var(--danger);
  border-color: var(--danger-dim);
  box-shadow: 0 0 12px var(--danger-glow);
  animation: glow-pulse 1s ease-in-out infinite;
}

/* Chess Board Container */
.board-container {
  position: relative;
  width: 100%;
  max-width: var(--board-max);
  aspect-ratio: 1;
  border: 2px solid var(--board-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-glow), var(--shadow-lg);
  background: var(--board-dark);
}

.board-container__inner {
  width: 100%;
  height: 100%;
  display: block;
}

.pion-board-wrapper {
  width: 100%;
  height: 100%;
  display: flex !important;
  flex-direction: column;
  box-sizing: border-box;
}

.pion-board-wrapper svg {
  flex: 1;
  width: 100% !important;
  height: 100% !important;
  display: block;
}

.board-square {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0;
  cursor: pointer;
  position: relative;
  transition: background-color var(--duration-fast);
}

.board-square--light {
  background-color: var(--board-light);
}

.board-square--dark {
  background-color: var(--board-dark);
}

.board-square--highlighted {
  background-color: var(--board-highlight);
}

.board-square--selected {
  background-color: var(--board-selected);
}

.board-square--lastmove {
  background-color: var(--board-lastmove);
}

.board-square--check {
  background: radial-gradient(ellipse at center, var(--board-check), transparent 70%);
}

.board-square__piece {
  font-size: clamp(1.8rem, 5vw, 3.5rem);
  cursor: grab;
  user-select: none;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.5));
  transition: transform var(--duration-fast) var(--ease-spring);
}

.board-square__piece:hover {
  transform: scale(1.1);
}

.board-square__dot {
  position: absolute;
  width: 28%;
  height: 28%;
  border-radius: var(--radius-full);
  background: var(--accent-glow-md);
}

.board-square__capture-ring {
  position: absolute;
  width: 80%;
  height: 80%;
  border-radius: var(--radius-full);
  border: 3px solid var(--accent-glow-md);
}

/* File/Rank labels */
.board-container__files,
.board-container__ranks {
  position: absolute;
  display: flex;
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-muted);
  pointer-events: none;
}

.board-container__files {
  bottom: 2px;
  left: 0;
  right: 0;
  justify-content: space-around;
  padding: 0 3%;
}

.board-container__ranks {
  top: 0;
  bottom: 0;
  left: 3px;
  flex-direction: column;
  justify-content: space-around;
  padding: 2% 0;
}

/* Move History */
.move-history {
  width: 100%;
  max-width: var(--board-max);
  max-height: 200px;
  overflow-y: auto;
  background: var(--glass-bg-md);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--sp-3) var(--sp-4);
}

.move-history__title {
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--sp-2);
}

.move-history__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1);
}

.move-history__number {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-muted);
  min-width: 30px;
}

.move-history__move {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-primary);
  padding: var(--sp-1) var(--sp-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--duration-fast);
  min-width: 45px;
  text-align: center;
}

.move-history__move:hover {
  background: var(--accent-glow);
}

.move-history__move--active {
  background: var(--accent-glow-md);
  color: var(--accent);
}

/* Captured Pieces */
.captured-pieces {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  min-height: 28px;
  font-size: var(--fs-md);
  opacity: 0.7;
  flex-wrap: wrap;
}

.captured-pieces__advantage {
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  color: var(--accent);
  margin-left: var(--sp-2);
  font-weight: 600;
}

/* Game Actions */
.game-actions {
  display: flex;
  gap: var(--sp-3);
  width: 100%;
  max-width: var(--board-max);
}

/* Difficulty Selector */
.difficulty-selector {
  display: flex;
  gap: var(--sp-3);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--sp-4);
}

.difficulty-btn {
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  padding: var(--sp-2) var(--sp-5);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: all var(--duration-fast) var(--ease-out);
}

.difficulty-btn:hover {
  border-color: var(--accent-dim);
  color: var(--accent);
}

.difficulty-btn--active {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}


/* ── Matchmaking Screen ───────────────────────────────────── */
.matchmaking-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--navbar-height) - var(--sp-12));
  text-align: center;
  gap: var(--sp-8);
}

.matchmaking__title {
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.matchmaking__subtitle {
  font-size: var(--fs-base);
  color: var(--text-secondary);
  margin-top: var(--sp-2);
}

.time-controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
  max-width: 400px;
  width: 100%;
}

.time-control-btn {
  font-family: var(--font-heading);
  font-size: var(--fs-lg);
  font-weight: 700;
  padding: var(--sp-4) var(--sp-3);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background: var(--glass-bg-md);
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
  text-align: center;
}

.time-control-btn span {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 400;
  margin-top: var(--sp-1);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.time-control-btn:hover {
  border-color: var(--accent-dim);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.time-control-btn--active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
  box-shadow: var(--shadow-glow);
}

/* Searching animation */
.searching-area {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-6);
  padding: var(--sp-8) 0;
}

.searching-area.active {
  display: flex;
  animation: fade-in var(--duration-slow) var(--ease-out);
}

.searching-radar {
  position: relative;
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  border: 2px solid var(--border-color);
  overflow: hidden;
}

.searching-radar::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50%;
  height: 50%;
  transform-origin: 0 0;
  background: linear-gradient(90deg, transparent, var(--accent-glow-lg));
  animation: radar-sweep 2s linear infinite;
}

.searching-radar__dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  margin: -4px 0 0 -4px;
  background: var(--accent);
  border-radius: var(--radius-full);
  box-shadow: 0 0 10px var(--accent);
}

.searching-text {
  font-family: var(--font-heading);
  font-size: var(--fs-md);
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: glow-pulse 2s ease-in-out infinite;
}

.searching-elapsed {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-muted);
}


/* ── Wallet Screen ────────────────────────────────────────── */
.wallet-layout {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
  max-width: 600px;
  margin: 0 auto;
}

.wallet-header {
  text-align: center;
  padding: var(--sp-6) 0;
}

.wallet-header__title {
  font-size: var(--fs-2xl);
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--sp-2);
}

.wallet-header__status {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-sm);
  color: var(--text-secondary);
}

.balance-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-4);
}

.balance-card {
  background: var(--glass-bg-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--sp-6);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.balance-card__icon {
  font-size: var(--fs-2xl);
  margin-bottom: var(--sp-3);
}

.balance-card__label {
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--sp-2);
}

.balance-card__amount {
  font-family: var(--font-heading);
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent-glow);
  letter-spacing: 0.04em;
}

.balance-card__usd {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  margin-top: var(--sp-1);
}

/* Send Form */
.send-form {
  background: var(--glass-bg-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--sp-6);
}

.send-form__title {
  font-family: var(--font-heading);
  font-size: var(--fs-md);
  font-weight: 700;
  margin-bottom: var(--sp-4);
  letter-spacing: 0.04em;
}

/* Transaction History */
.tx-history {
  background: var(--glass-bg-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--sp-6);
}

.tx-history__title {
  font-family: var(--font-heading);
  font-size: var(--fs-md);
  font-weight: 700;
  margin-bottom: var(--sp-4);
  letter-spacing: 0.04em;
}

.tx-history__list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.tx-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-3) var(--sp-4);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.03);
  transition: border-color var(--duration-fast);
}

.tx-item:hover {
  border-color: var(--border-color);
}

.tx-item__left {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.tx-item__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-md);
}

.tx-item__icon--send {
  background: var(--danger-glow);
}

.tx-item__icon--receive {
  background: var(--success-glow);
}

.tx-item__details {
  display: flex;
  flex-direction: column;
}

.tx-item__type {
  font-weight: 600;
  font-size: var(--fs-sm);
}

.tx-item__address {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-muted);
}

.tx-item__right {
  text-align: right;
}

.tx-item__amount {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--fs-sm);
}

.tx-item__amount--positive {
  color: var(--accent);
}

.tx-item__amount--negative {
  color: var(--danger);
}

.tx-item__time {
  font-size: var(--fs-xs);
  color: var(--text-muted);
}

.tx-empty {
  text-align: center;
  padding: var(--sp-8);
  color: var(--text-muted);
}

.tx-empty__icon {
  font-size: var(--fs-3xl);
  margin-bottom: var(--sp-3);
  opacity: 0.4;
}


/* ── Airdrop Screen ───────────────────────────────────────── */
.airdrop-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-8);
  max-width: 600px;
  margin: 0 auto;
  padding: var(--sp-8) 0;
}

.airdrop-banner {
  text-align: center;
  padding: var(--sp-6);
  background: var(--glass-bg-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 100%;
  box-shadow: var(--shadow-glow);
}

.airdrop-banner__icon {
  font-size: var(--fs-4xl);
  margin-bottom: var(--sp-4);
  animation: float 3s ease-in-out infinite;
}

.airdrop-banner__title {
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--sp-2);
}

.airdrop-banner__desc {
  font-size: var(--fs-base);
  color: var(--text-secondary);
  max-width: 400px;
  margin: 0 auto;
}

.airdrop-countdown {
  background: var(--glass-bg-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--sp-8);
  width: 100%;
  text-align: center;
}

.airdrop-countdown__label {
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--sp-4);
}

.airdrop-countdown__timer {
  display: flex;
  justify-content: center;
  gap: var(--sp-4);
}

.airdrop-countdown__segment {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
}

.airdrop-countdown__value {
  font-family: var(--font-mono);
  font-size: var(--fs-3xl);
  font-weight: 700;
  color: var(--accent);
  text-shadow: 0 0 20px var(--accent-glow);
  min-width: 70px;
  background: var(--bg-primary);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.airdrop-countdown__unit {
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.airdrop-countdown__colon {
  font-family: var(--font-mono);
  font-size: var(--fs-3xl);
  color: var(--accent);
  align-self: flex-start;
  padding-top: var(--sp-3);
  animation: glow-pulse 1s ease-in-out infinite;
}

.airdrop-claim {
  width: 100%;
  text-align: center;
}

.airdrop-claim__amount {
  font-family: var(--font-heading);
  font-size: var(--fs-lg);
  color: var(--text-primary);
  margin-bottom: var(--sp-4);
}

.airdrop-claim__amount strong {
  color: var(--accent);
  font-size: var(--fs-2xl);
}

/* Claim History */
.claim-history {
  width: 100%;
  background: var(--glass-bg-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--sp-6);
}

.claim-history__title {
  font-family: var(--font-heading);
  font-size: var(--fs-md);
  font-weight: 700;
  margin-bottom: var(--sp-4);
  letter-spacing: 0.04em;
}

.claim-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-3) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.claim-item:last-child {
  border-bottom: none;
}

.claim-item__date {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
}

.claim-item__amount {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--accent);
}


/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--fs-sm);
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--radius-md);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: all var(--duration-base) var(--ease-out);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: opacity var(--duration-fast);
}

.btn:hover::after {
  opacity: 1;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: var(--bg-primary);
  box-shadow: var(--shadow-glow);
}

.btn--primary:hover {
  box-shadow: var(--shadow-glow-lg);
  transform: translateY(-2px);
}

.btn--primary:active {
  transform: translateY(0) scale(0.97);
}

.btn--secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
}

.btn--secondary:hover {
  background: var(--accent-glow);
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.btn--danger {
  background: linear-gradient(135deg, var(--danger), var(--danger-dim));
  color: #fff;
  box-shadow: var(--shadow-danger);
}

.btn--danger:hover {
  box-shadow: 0 0 30px rgba(255, 68, 68, 0.4);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn--ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-color-md);
  background: rgba(255, 255, 255, 0.03);
}

.btn--large {
  padding: var(--sp-4) var(--sp-10);
  font-size: var(--fs-base);
  border-radius: var(--radius-lg);
}

.btn--small {
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--fs-xs);
}

.btn--full {
  width: 100%;
}

.btn--pulse {
  animation: glow-pulse 2s ease-in-out infinite;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}


/* ── Form Inputs ──────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-bottom: var(--sp-4);
}

.form-label {
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.form-input {
  width: 100%;
  padding: var(--sp-3) var(--sp-4);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-input:focus {
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input--mono {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
}


/* ── Modal / Overlay ──────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-out);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--sp-8);
  max-width: 420px;
  width: 90%;
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  transform: scale(0.9) translateY(20px);
  transition: transform var(--duration-slow) var(--ease-spring);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal__title {
  font-size: var(--fs-xl);
  font-weight: 800;
  margin-bottom: var(--sp-4);
  text-align: center;
  letter-spacing: 0.04em;
}

.modal__body {
  color: var(--text-secondary);
  margin-bottom: var(--sp-6);
  text-align: center;
  line-height: 1.7;
}

.modal__actions {
  display: flex;
  gap: var(--sp-3);
  justify-content: center;
}


/* ── Toast Notifications ──────────────────────────────────── */
#toast-container {
  position: fixed;
  top: calc(var(--navbar-height) + var(--sp-4));
  right: var(--sp-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  pointer-events: none;
  max-width: 360px;
  width: 100%;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4) var(--sp-5);
  background: var(--glass-bg-md);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: slide-in-right var(--duration-slow) var(--ease-spring);
  position: relative;
  overflow: hidden;
}

.toast::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
}

.toast--success::before {
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.toast--error::before {
  background: var(--danger);
  box-shadow: 0 0 8px var(--danger);
}

.toast--info::before {
  background: var(--info);
  box-shadow: 0 0 8px var(--info);
}

.toast--warning::before {
  background: var(--warning);
  box-shadow: 0 0 8px var(--warning);
}

.toast__icon {
  font-size: var(--fs-lg);
  flex-shrink: 0;
}

.toast--success .toast__icon { color: var(--accent); }
.toast--error   .toast__icon { color: var(--danger); }
.toast--info    .toast__icon { color: var(--info); }
.toast--warning .toast__icon { color: var(--warning); }

.toast__message {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-primary);
  flex: 1;
}

.toast__close {
  font-size: var(--fs-base);
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--sp-1);
  transition: color var(--duration-fast);
  flex-shrink: 0;
}

.toast__close:hover {
  color: var(--text-primary);
}

.toast--exiting {
  animation: slide-out-right var(--duration-base) var(--ease-out) forwards;
}


/* ── Loading Spinner ──────────────────────────────────────── */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

.spinner--small {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

.spinner--large {
  width: 60px;
  height: 60px;
  border-width: 4px;
}


/* ── Status Indicator ─────────────────────────────────────── */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  position: relative;
}

.status-dot--online {
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}

.status-dot--online::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: var(--radius-full);
  border: 1px solid var(--accent);
  animation: glow-pulse 2s ease-in-out infinite;
  opacity: 0.5;
}

.status-dot--offline {
  background: var(--text-muted);
}

.status-dot--connecting {
  background: var(--warning);
  animation: glow-pulse 1s ease-in-out infinite;
}


/* ── Section Headers ──────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-6);
}

.section-title {
  font-size: var(--fs-xl);
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-color), transparent);
  margin: var(--sp-6) 0;
}


/* ── Empty State ──────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--sp-12);
  text-align: center;
  color: var(--text-muted);
}

.empty-state__icon {
  font-size: 3rem;
  margin-bottom: var(--sp-4);
  opacity: 0.3;
}

.empty-state__text {
  font-size: var(--fs-sm);
  max-width: 300px;
}


/* ── Keyframe Animations ─────────────────────────────────── */
@keyframes glow-pulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 12px var(--accent-glow);
  }
  50% {
    opacity: 0.85;
    box-shadow: 0 0 25px var(--accent-glow-md), 0 0 50px var(--accent-glow);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

@keyframes scan-lines {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 0 100vh;
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slide-in-right {
  from {
    opacity: 0;
    transform: translateX(100px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slide-out-right {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(100px);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes radar-sweep {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse-ring {
  0% {
    transform: scale(1);
    opacity: 0.5;
  }
  100% {
    transform: scale(2.2);
    opacity: 0;
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes text-glow {
  0%, 100% {
    text-shadow: 0 0 10px var(--accent-glow);
  }
  50% {
    text-shadow: 0 0 25px var(--accent-glow-md), 0 0 50px var(--accent-glow);
  }
}

@keyframes border-flow {
  0% {
    border-color: var(--border-color);
  }
  50% {
    border-color: var(--accent-dim);
  }
  100% {
    border-color: var(--border-color);
  }
}

@keyframes dots-loading {
  0%, 20% {
    content: '.';
  }
  40% {
    content: '..';
  }
  60%, 100% {
    content: '...';
  }
}


/* ── Utility Classes ──────────────────────────────────────── */
.text-accent  { color: var(--accent); }
.text-danger  { color: var(--danger); }
.text-muted   { color: var(--text-muted); }
.text-center  { text-align: center; }
.font-heading { font-family: var(--font-heading); }
.font-mono    { font-family: var(--font-mono); }
.hidden       { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mt-1 { margin-top: var(--sp-1); }
.mt-2 { margin-top: var(--sp-2); }
.mt-4 { margin-top: var(--sp-4); }
.mt-6 { margin-top: var(--sp-6); }
.mt-8 { margin-top: var(--sp-8); }
.mb-2 { margin-bottom: var(--sp-2); }
.mb-4 { margin-bottom: var(--sp-4); }
.mb-6 { margin-bottom: var(--sp-6); }
.gap-2 { gap: var(--sp-2); }
.gap-4 { gap: var(--sp-4); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-1 { flex: 1; }
.w-full { width: 100%; }


/* ── Responsive: 480px+ ──────────────────────────────────── */
@media (min-width: 480px) {
  :root {
    --fs-lg: 1.5rem;
    --fs-xl: 2rem;
    --fs-2xl: 2.5rem;
    --fs-3xl: 3.5rem;
  }

  .screen {
    padding: var(--sp-8);
  }

  .lobby__title {
    font-size: var(--fs-3xl);
  }

  .lobby__card {
    padding: var(--sp-10) var(--sp-8);
  }

  .airdrop-countdown__value {
    font-size: var(--fs-3xl);
    min-width: 80px;
  }

  .toast {
    max-width: 360px;
  }
}


/* ── Responsive: 768px+ ──────────────────────────────────── */
@media (min-width: 768px) {
  :root {
    --navbar-height: 72px;
  }

  .navbar {
    padding: 0 var(--sp-10);
  }

  .navbar__logo {
    font-size: var(--fs-xl);
  }

  .lobby__grid {
    gap: var(--sp-8);
    max-width: 800px;
  }

  .lobby__card-icon {
    font-size: 4.5rem;
  }

  .game-layout {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-start;
    gap: var(--sp-8);
  }

  .game-layout .board-container {
    flex-shrink: 0;
  }

  .game-side-panel {
    flex: 1;
    min-width: 250px;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    gap: var(--sp-4);
  }

  .move-history {
    max-height: 350px;
  }

  .time-controls {
    max-width: 500px;
  }

  .balance-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}


/* ── Responsive: 1024px+ ─────────────────────────────────── */
@media (min-width: 1024px) {
  :root {
    --board-max: 600px;
  }

  .lobby__grid {
    max-width: 900px;
  }

  .lobby__card {
    padding: var(--sp-12) var(--sp-10);
  }

  .game-side-panel {
    max-width: 350px;
  }

  .move-history {
    max-height: 450px;
  }

  .matchmaking-layout {
    gap: var(--sp-10);
  }
}


/* ── Responsive: 1200px+ (large screens) ─────────────────── */
@media (min-width: 1200px) {
  .lobby__card-icon {
    font-size: 5rem;
  }

  .lobby__card-title {
    font-size: var(--fs-xl);
  }
}


/* ── Reduced Motion ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .scanline-overlay {
    animation: none;
    display: none;
  }
}


/* ── Print ────────────────────────────────────────────────── */
@media print {
  .navbar,
  .scanline-overlay,
  #particle-canvas,
  #toast-container {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .screen {
    display: block !important;
    opacity: 1 !important;
    padding-top: 0;
  }
}