/* ============================================================
   SUMFLASH – Premium CSS Design System
   ============================================================ */

/* --- Fonts & Reset --- */
@keyframes shakeInput {
  0%,100% { transform: translateX(0); }
  20%     { transform: translateX(-8px); }
  40%     { transform: translateX(8px); }
  60%     { transform: translateX(-5px); }
  80%     { transform: translateX(5px); }
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-deep:    #07071a;
  --bg-dark:    #0d0d2b;
  --bg-card:    rgba(255,255,255,0.04);
  --bg-card2:   rgba(255,255,255,0.07);
  --border:     rgba(255,255,255,0.08);
  --border-glow:rgba(100,120,255,0.35);

  --accent:     #6c63ff;
  --accent2:    #a78bfa;
  --neon:       #00f0ff;
  --neon2:      #7c3aed;
  --success:    #10f080;
  --danger:     #ff4d6d;
  --warning:    #fbbf24;

  --text:       #e8eaff;
  --text-muted: #7a7d99;
  --text-dim:   #4a4d66;

  --radius:     16px;
  --radius-sm:  10px;
  --shadow:     0 8px 40px rgba(0,0,0,0.5);
  --shadow-glow:0 0 40px rgba(108,99,255,0.35);
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

html { font-size: 16px; }

body {
  font-family: 'Outfit', sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  min-height: 100vh;
  overflow: hidden;
  position: relative;
  overscroll-behavior: none;
}

/* ---- Particle Canvas ---- */
#particleCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* ============================================================
   SCREENS
   ============================================================ */
.screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.4,0,0.2,1);
  transform: translateY(20px);
  overflow-y: auto;
  padding: 20px 0;
}

.screen.active {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}

.screen.exit {
  opacity: 0;
  transform: translateY(-20px);
}

/* ============================================================
   MENU SCREEN
   ============================================================ */
.menu-container {
  width: min(92vw, 520px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

/* Logo */
.logo-area {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.logo-icon {
  width: 80px;
  height: 80px;
  border-radius: 24px;
  background: linear-gradient(135deg, var(--accent), var(--neon));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 40px rgba(108,99,255,0.6), 0 0 80px rgba(0,240,255,0.2);
  animation: logoFloat 3s ease-in-out infinite;
}

.logo-sigma {
  font-size: 42px;
  font-weight: 900;
  color: #fff;
  line-height: 1;
}

@keyframes logoFloat {
  0%,100% { transform: translateY(0) rotate(-2deg); }
  50%      { transform: translateY(-8px) rotate(2deg); }
}

.logo-title {
  font-size: 2.8rem;
  font-weight: 900;
  background: linear-gradient(135deg, #fff 30%, var(--neon));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
}

.logo-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
  font-weight: 400;
}

/* Settings Card */
.settings-card {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.settings-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.8rem;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.setting-label {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.setting-icon { font-size: 1rem; }

.btn-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.time-btn {
  flex: 1;
  min-width: 48px;
  padding: 10px 8px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-family: 'Outfit', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.time-btn:hover {
  border-color: var(--accent);
  color: var(--text);
  background: rgba(108,99,255,0.1);
}

.time-btn.active {
  background: linear-gradient(135deg, var(--accent), var(--neon2));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 0 20px rgba(108,99,255,0.4);
}

/* Start Button */
.btn-start {
  width: 100%;
  padding: 18px 32px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--neon) 100%);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 2px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 30px rgba(108,99,255,0.5), 0 4px 20px rgba(0,0,0,0.4);
  transition: var(--transition);
}

.btn-start::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.btn-start:hover::before { opacity: 1; }
.btn-start:hover { transform: translateY(-2px); box-shadow: 0 0 50px rgba(108,99,255,0.6), 0 8px 30px rgba(0,0,0,0.4); }
.btn-start:active { transform: translateY(0); }

.btn-start-text { font-size: 1.05rem; font-weight: 800; letter-spacing: 3px; }
.btn-start-arrow { font-size: 1.3rem; }

/* High Score Bar */
.high-score-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  backdrop-filter: blur(10px);
}

.hs-label { color: var(--text-muted); font-size: 0.9rem; }
.hs-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--warning);
}

/* ============================================================
   COUNTDOWN SCREEN
   ============================================================ */
.countdown-container {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.countdown-label {
  font-size: 1.2rem;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.countdown-number {
  font-size: clamp(8rem, 20vw, 12rem);
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent), var(--neon));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  animation: countPulse 0.9s ease-out;
  text-shadow: none;
  filter: drop-shadow(0 0 40px rgba(0,240,255,0.5));
}

@keyframes countPulse {
  0%   { transform: scale(1.5); opacity: 0; }
  60%  { transform: scale(0.95); opacity: 1; }
  100% { transform: scale(1); }
}

.countdown-hint {
  color: var(--text-muted);
  font-size: 1rem;
}

/* ============================================================
   SHOW NUMBERS SCREEN
   ============================================================ */
.show-container {
  width: min(92vw, 480px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.show-header {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.show-progress {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  color: var(--text-muted);
  letter-spacing: 2px;
}

.show-timer-bar-wrap {
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}

.show-timer-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--neon));
  border-radius: 99px;
  transform-origin: left;
  transition: transform linear;
}

.number-display-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.number-display {
  width: clamp(200px, 50vw, 280px);
  height: clamp(200px, 50vw, 280px);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(108,99,255,0.2), rgba(0,240,255,0.05));
  border: 2px solid rgba(108,99,255,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 2;
  animation: numberAppear 0.4s cubic-bezier(0.34,1.56,0.64,1);
}

@keyframes numberAppear {
  0%   { transform: scale(0.3) rotate(-15deg); opacity: 0; }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

.number-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(4rem, 12vw, 6rem);
  font-weight: 700;
  background: linear-gradient(135deg, #fff 40%, var(--neon));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 20px rgba(0,240,255,0.6));
}

.number-glow {
  position: absolute;
  width: 120%;
  height: 120%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(108,99,255,0.2) 0%, transparent 70%);
  animation: glowPulse 2s ease-in-out infinite;
  z-index: 1;
}

@keyframes glowPulse {
  0%,100% { transform: scale(1); opacity: 0.6; }
  50%      { transform: scale(1.1); opacity: 1; }
}

.show-hint {
  color: var(--text-muted);
  font-size: 1rem;
  letter-spacing: 1px;
}

/* ============================================================
   GUESS SCREEN
   ============================================================ */
.guess-container {
  width: min(92vw, 520px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.guess-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.guess-title {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, #fff, var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Timer Ring */
.guess-timer-ring {
  position: relative;
  width: 76px;
  height: 76px;
}

.timer-svg {
  width: 76px;
  height: 76px;
  transform: rotate(-90deg);
}

.timer-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 5;
}

.timer-fill {
  fill: none;
  stroke: url(#timerGrad);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 276.46;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear, stroke 0.5s ease;
}

.timer-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

/* Seen numbers chips */
.seen-numbers {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  min-height: 48px;
}

.num-chip {
  padding: 8px 16px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 99px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent2);
  animation: chipAppear 0.3s cubic-bezier(0.34,1.56,0.64,1);
}

@keyframes chipAppear {
  0%   { transform: scale(0); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

/* Input area */
.guess-input-area {
  width: 100%;
  display: flex;
  gap: 12px;
}

.guess-input-wrap {
  flex: 1;
  position: relative;
}

.guess-input {
  width: 100%;
  padding: 16px 20px;
  background: var(--bg-card2);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.5rem;
  font-weight: 700;
  outline: none;
  transition: border-color 0.25s, box-shadow 0.25s;
  text-align: center;
  -moz-appearance: textfield;
}

.guess-input::-webkit-outer-spin-button,
.guess-input::-webkit-inner-spin-button { -webkit-appearance: none; }

.guess-input::placeholder { color: var(--text-dim); font-size: 1rem; font-weight: 400; }

.guess-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(108,99,255,0.2), 0 0 20px rgba(108,99,255,0.15);
}

.guess-input.shake {
  animation: shakeInput 0.45s ease;
  border-color: var(--danger) !important;
}

.input-glow {
  position: absolute;
  inset: -1px;
  border-radius: var(--radius);
  pointer-events: none;
}

.btn-submit {
  padding: 16px 24px;
  background: linear-gradient(135deg, var(--success), #00d4ff);
  border: none;
  border-radius: var(--radius);
  color: #0a1a0f;
  font-family: 'Outfit', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  white-space: nowrap;
  box-shadow: 0 0 20px rgba(16,240,128,0.3);
}

.btn-submit:hover { transform: translateY(-2px); box-shadow: 0 0 30px rgba(16,240,128,0.5); }
.btn-submit:active { transform: translateY(0); }

.score-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.score-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
}

.score-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2rem;
  font-weight: 700;
  color: var(--warning);
}

/* ============================================================
   RESULT SCREEN
   ============================================================ */
.result-container {
  width: min(92vw, 480px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.result-icon {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  font-weight: 900;
  animation: resultPop 0.5s cubic-bezier(0.34,1.56,0.64,1);
}

.result-icon.correct {
  background: radial-gradient(circle, rgba(16,240,128,0.2), transparent);
  border: 3px solid var(--success);
  color: var(--success);
  box-shadow: 0 0 40px rgba(16,240,128,0.4);
}

.result-icon.wrong {
  background: radial-gradient(circle, rgba(255,77,109,0.2), transparent);
  border: 3px solid var(--danger);
  color: var(--danger);
  box-shadow: 0 0 40px rgba(255,77,109,0.4);
}

.result-icon.timeout {
  background: radial-gradient(circle, rgba(251,191,36,0.2), transparent);
  border: 3px solid var(--warning);
  color: var(--warning);
  box-shadow: 0 0 40px rgba(251,191,36,0.4);
}

@keyframes resultPop {
  0%   { transform: scale(0) rotate(-20deg); opacity: 0; }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

.result-title {
  font-size: 2.2rem;
  font-weight: 900;
}

.result-title.correct { color: var(--success); }
.result-title.wrong   { color: var(--danger); }
.result-title.timeout { color: var(--warning); }

.result-message {
  color: var(--text-muted);
  font-size: 1rem;
}

.result-stats {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
}

.stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
}

.stat-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
}

.result-numbers {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.res-chip {
  padding: 6px 14px;
  border-radius: 99px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  font-weight: 700;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  color: var(--accent2);
}

.result-total-score {
  width: 100%;
  background: linear-gradient(135deg, rgba(108,99,255,0.15), rgba(0,240,255,0.08));
  border: 1px solid rgba(108,99,255,0.3);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.total-score-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.total-score-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--warning);
}

.result-actions {
  width: 100%;
  display: flex;
  gap: 12px;
}

.btn-next {
  flex: 2;
  padding: 14px 24px;
  background: linear-gradient(135deg, var(--accent), var(--neon2));
  border: none;
  border-radius: var(--radius);
  color: #fff;
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 0 20px rgba(108,99,255,0.35);
}

.btn-next:hover { transform: translateY(-2px); box-shadow: 0 0 35px rgba(108,99,255,0.55); }

.btn-quit {
  flex: 1;
  padding: 14px 24px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-quit:hover { border-color: var(--danger); color: var(--danger); }

/* ============================================================
   GAME OVER SCREEN
   ============================================================ */
.gameover-container {
  width: min(92vw, 460px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

.gameover-trophy {
  font-size: 5rem;
  animation: trophyBounce 0.6s cubic-bezier(0.34,1.56,0.64,1);
  filter: drop-shadow(0 0 30px rgba(251,191,36,0.6));
}

@keyframes trophyBounce {
  0%   { transform: scale(0) translateY(40px); opacity: 0; }
  100% { transform: scale(1) translateY(0); opacity: 1; }
}

.gameover-title {
  font-size: 2.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--warning), #ff9100);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gameover-stats {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.go-stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}

.go-stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
}

.go-stat-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.go-play-again { margin-top: 8px; }

.go-menu {
  width: 100%;
  padding: 14px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.go-menu:hover { border-color: var(--accent); color: var(--accent); }

/* ============================================================
   SVG GRADIENT DEF (hidden)
   ============================================================ */
.svg-defs { position: absolute; width: 0; height: 0; }

/* ============================================================
   CONFETTI (dynamic)
   ============================================================ */
.confetti-piece {
  position: fixed;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  animation: confettiFall linear forwards;
  pointer-events: none;
  z-index: 999;
}

@keyframes confettiFall {
  0%   { transform: translateY(-10px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 480px) {
  .result-stats, .gameover-stats { grid-template-columns: 1fr 1fr; }
  .result-stats .stat-card:last-child { grid-column: span 2; }
  .logo-title { font-size: 2.2rem; }
}