/* ─── CSS Variables ─────────────────────────────────────────────────────────── */
:root {
  --bg: #0a0e1a;
  --bg2: #111827;
  --bg3: #1a2234;
  --accent: #00ff88;
  --accent2: #00ccff;
  --danger: #ff4444;
  --warn: #ffaa00;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --border: #2a3a50;
  --exact: #00c96d;
  --close: #d97706;
  --miss: #1e2d42;
}

/* ─── Reset & Base ───────────────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
}

/* ─── Screen Management ──────────────────────────────────────────────────────── */
.screen {
  display: none;
  width: 100%;
  max-width: 480px;
  min-height: 100vh;
  min-height: 100dvh;
  flex-direction: column;
  align-items: center;
  padding: 0 0 32px;
}

.screen.active {
  display: flex;
}

.screen-content {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 32px 20px;
  flex: 1;
}

/* ─── Logo / Header ──────────────────────────────────────────────────────────── */
.logo {
  text-align: center;
  padding: 24px 0 8px;
}

.logo-icon {
  font-size: 3.5rem;
  margin-bottom: 12px;
  filter: drop-shadow(0 0 20px rgba(0, 255, 136, 0.5));
}

.app-title {
  font-family: 'Share Tech Mono', monospace;
  font-size: clamp(2rem, 8vw, 2.8rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-shadow:
    0 0 10px rgba(0, 255, 136, 0.6),
    0 0 30px rgba(0, 255, 136, 0.3),
    0 0 60px rgba(0, 255, 136, 0.15);
  text-transform: uppercase;
}

.app-subtitle {
  color: var(--text-dim);
  font-size: 1rem;
  margin-top: 8px;
  letter-spacing: 0.05em;
}

/* ─── Screen Header Bar ──────────────────────────────────────────────────────── */
.screen-header {
  width: 100%;
  display: flex;
  align-items: center;
  padding: 16px 20px 8px;
  gap: 12px;
  border-bottom: 1px solid var(--border);
}

.screen-header h2 {
  font-family: 'Share Tech Mono', monospace;
  font-size: 1.2rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  flex: 1;
}

.back-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: color 0.2s, border-color 0.2s;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.back-btn:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

/* ─── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, filter 0.15s, opacity 0.15s;
  min-height: 52px;
  letter-spacing: 0.04em;
  text-decoration: none;
  width: 100%;
  max-width: 320px;
}

.btn:active {
  transform: scale(0.97);
  filter: brightness(0.9);
}

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

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.5);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
  box-shadow: 0 0 20px rgba(255, 68, 68, 0.3);
}

.btn-danger:hover {
  filter: brightness(1.1);
}

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

.btn-ghost:hover {
  border-color: var(--text-dim);
  background: var(--bg3);
}

.btn-secondary {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: var(--accent2);
  color: var(--accent2);
}

/* ─── Home Screen ────────────────────────────────────────────────────────────── */
.home-actions {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.join-area {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 16px;
  max-width: 320px;
}

.join-area.hidden {
  display: none;
}

.code-input {
  width: 100%;
  background: var(--bg2);
  border: 2px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-family: 'Share Tech Mono', monospace;
  font-size: 1.6rem;
  letter-spacing: 0.2em;
  padding: 12px 16px;
  text-align: center;
  text-transform: uppercase;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  min-height: 60px;
}

.code-input:focus {
  border-color: var(--accent2);
  box-shadow: 0 0 0 3px rgba(0, 204, 255, 0.2);
}

.code-input::placeholder {
  color: var(--text-dim);
  font-size: 1rem;
  letter-spacing: 0.05em;
}

/* ─── Create Keypad ─────────────────────────────────────────────────────────── */
#create-keypad-container {
  width: 100%;
}

#create-keypad-container .keypad {
  max-width: 100%;
}

/* ─── Create Screen ──────────────────────────────────────────────────────────── */
.create-step {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

.create-step.hidden {
  display: none;
}

.setting-group {
  width: 100%;
  max-width: 320px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.setting-label {
  font-size: 0.85rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.setting-desc {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: -8px;
}

/* ─── Stepper Control ────────────────────────────────────────────────────────── */
.stepper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.stepper-btn {
  width: 44px;
  height: 44px;
  min-height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg2);
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, background 0.2s, transform 0.1s;
  flex-shrink: 0;
}

.stepper-btn:hover {
  border-color: var(--accent);
  background: var(--bg3);
}

.stepper-btn:active {
  transform: scale(0.92);
}

.stepper-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.stepper-value {
  font-family: 'Share Tech Mono', monospace;
  font-size: 2.2rem;
  color: var(--accent);
  min-width: 48px;
  text-align: center;
  line-height: 1;
}

/* ─── PIN Display (guess input area) ────────────────────────────────────────── */
.pin-display {
  display: flex;
  flex-direction: row;
  gap: 8px;
  justify-content: center;
  align-items: center;
  padding: 8px 0;
}

.pin-cell {
  width: 56px;
  height: 56px;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: var(--bg3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Share Tech Mono', monospace;
  font-size: 1.6rem;
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
  flex-shrink: 0;
}

/* Adjust cell size for longer PINs */
.pin-display.length-7 .pin-cell,
.pin-display.length-8 .pin-cell {
  width: 46px;
  height: 46px;
  font-size: 1.3rem;
  border-radius: 8px;
}

.pin-display.length-6 .pin-cell {
  width: 50px;
  height: 50px;
}

.pin-cell.filled {
  border-color: var(--accent2);
  color: #fff;
}

.pin-cell.masked {
  color: var(--accent);
  font-size: 2rem;
}

.pin-cell.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.2), 0 0 12px rgba(0, 255, 136, 0.3);
  animation: glow-pulse 1.4s ease-in-out infinite;
}

/* ─── Keypad ─────────────────────────────────────────────────────────────────── */
.keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding: 16px;
  width: 100%;
  max-width: 320px;
}

.key {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 14px;
  min-height: 70px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 1.5rem;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s, transform 0.1s, box-shadow 0.1s;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.key:hover {
  background: var(--bg2);
  border-color: var(--text-dim);
}

.key:active {
  transform: scale(0.92);
  background: var(--bg2);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.4);
}

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

.key-submit {
  background: var(--accent);
  color: var(--bg);
  font-size: 1.3rem;
  font-weight: 700;
  border-color: var(--accent);
  box-shadow: 0 0 16px rgba(0, 255, 136, 0.3);
}

.key-submit:hover {
  filter: brightness(1.1);
}

.key-submit:active {
  filter: brightness(0.9);
}

.key-submit:disabled {
  background: var(--border);
  color: var(--text-dim);
  border-color: var(--border);
  box-shadow: none;
  opacity: 1;
}

.key-delete {
  color: var(--warn);
  font-size: 1.3rem;
}

/* ─── Attempts History Grid ──────────────────────────────────────────────────── */
.attempts-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  padding: 0 16px;
  align-items: center;
}

.attempt-row {
  display: flex;
  flex-direction: row;
  gap: 6px;
  justify-content: center;
  animation: slideIn 0.3s ease-out forwards;
}

.attempt-cell {
  width: 52px;
  height: 52px;
  border-radius: 8px;
  background: var(--miss);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Share Tech Mono', monospace;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-dim);
  flex-shrink: 0;
  transition: background 0.3s;
}

/* Adjust attempt cell for longer PINs */
.attempt-row.length-7 .attempt-cell,
.attempt-row.length-8 .attempt-cell {
  width: 42px;
  height: 42px;
  font-size: 1.1rem;
  border-radius: 6px;
}

.attempt-row.length-6 .attempt-cell {
  width: 46px;
  height: 46px;
}

.attempt-cell.exact {
  background: var(--exact);
  color: #fff;
}

.attempt-cell.close {
  background: var(--close);
  color: #fff;
}

.attempt-cell.miss {
  background: var(--miss);
  color: var(--text-dim);
}

/* ─── Play Screen ────────────────────────────────────────────────────────────── */
.game-info-bar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
}

.game-id-display {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.9rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

.game-id-display span {
  color: var(--accent2);
}

.tries-info {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.tries-info strong {
  color: var(--text);
}

/* ─── Tries Dots Bar ─────────────────────────────────────────────────────────── */
.tries-bar {
  display: flex;
  flex-direction: row;
  gap: 6px;
  align-items: center;
  justify-content: center;
  padding: 8px 0;
  flex-wrap: wrap;
}

.try-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--border);
  transition: background 0.3s;
  flex-shrink: 0;
}

.try-dot.used {
  background: var(--danger);
}

.try-dot.remaining {
  background: var(--accent);
  box-shadow: 0 0 6px rgba(0, 255, 136, 0.5);
}

/* ─── Share Screen ───────────────────────────────────────────────────────────── */
.share-card {
  width: 100%;
  max-width: 320px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.share-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.game-code-display {
  font-family: 'Share Tech Mono', monospace;
  font-size: clamp(2.2rem, 10vw, 3rem);
  color: var(--accent);
  letter-spacing: 0.3em;
  text-shadow:
    0 0 10px rgba(0, 255, 136, 0.5),
    0 0 30px rgba(0, 255, 136, 0.2);
  text-align: center;
}

.share-url {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-dim);
  word-break: break-all;
  text-align: center;
  padding: 8px 12px;
  background: var(--bg2);
  border-radius: 8px;
  border: 1px solid var(--border);
  width: 100%;
}

.share-instruction {
  font-size: 0.9rem;
  color: var(--text-dim);
  text-align: center;
  line-height: 1.5;
}

.share-buttons {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.copy-feedback {
  font-size: 0.8rem;
  color: var(--accent);
  min-height: 20px;
  text-align: center;
  transition: opacity 0.3s;
}

/* ─── Result Screen ──────────────────────────────────────────────────────────── */
.result-content {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 20px;
}

.result-icon {
  font-size: 4rem;
  line-height: 1;
  margin-bottom: 4px;
}

.result-title {
  font-family: 'Share Tech Mono', monospace;
  font-size: clamp(1.8rem, 8vw, 2.5rem);
  letter-spacing: 0.1em;
  text-align: center;
}

.result-title.win {
  color: var(--accent);
  text-shadow:
    0 0 10px rgba(0, 255, 136, 0.6),
    0 0 30px rgba(0, 255, 136, 0.3);
  animation: celebrate 0.6s ease-out forwards;
}

.result-title.lose {
  color: var(--danger);
  text-shadow:
    0 0 10px rgba(255, 68, 68, 0.6),
    0 0 30px rgba(255, 68, 68, 0.3);
}

.result-subtitle {
  font-size: 1rem;
  color: var(--text-dim);
  text-align: center;
  line-height: 1.5;
}

.result-pin-reveal {
  font-family: 'Share Tech Mono', monospace;
  font-size: 2rem;
  color: var(--accent2);
  letter-spacing: 0.3em;
  padding: 16px 24px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-shadow: 0 0 10px rgba(0, 204, 255, 0.4);
}

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

/* ─── Legend ─────────────────────────────────────────────────────────────────── */
.legend {
  display: flex;
  flex-direction: row;
  gap: 12px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  padding: 8px 16px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.legend-dot {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  flex-shrink: 0;
}

.legend-dot.exact { background: var(--exact); }
.legend-dot.close { background: var(--close); }
.legend-dot.miss  { background: var(--miss); border: 1px solid var(--border); }

/* ─── Section Divider ────────────────────────────────────────────────────────── */
.section-title {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: center;
  width: 100%;
  padding: 4px 0;
}

/* ─── Error / Toast ──────────────────────────────────────────────────────────── */
.error-message {
  background: rgba(255, 68, 68, 0.1);
  border: 1px solid rgba(255, 68, 68, 0.4);
  color: var(--danger);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.9rem;
  text-align: center;
  width: 100%;
  max-width: 320px;
  display: none;
}

.error-message.visible {
  display: block;
}

.info-message {
  background: rgba(0, 204, 255, 0.08);
  border: 1px solid rgba(0, 204, 255, 0.3);
  color: var(--accent2);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.85rem;
  text-align: center;
  width: 100%;
  max-width: 320px;
}

/* ─── Loading Spinner ────────────────────────────────────────────────────────── */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 32px;
  color: var(--text-dim);
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ─── Utility ────────────────────────────────────────────────────────────────── */
.hidden {
  display: none !important;
}

.text-center { text-align: center; }
.w-full { width: 100%; }

/* ─── Animations ─────────────────────────────────────────────────────────────── */
@keyframes glow-pulse {
  0%, 100% {
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.2), 0 0 12px rgba(0, 255, 136, 0.3);
  }
  50% {
    box-shadow: 0 0 0 4px rgba(0, 255, 136, 0.35), 0 0 20px rgba(0, 255, 136, 0.5);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  15%       { transform: translateX(-8px); }
  30%       { transform: translateX(8px); }
  45%       { transform: translateX(-6px); }
  60%       { transform: translateX(6px); }
  75%       { transform: translateX(-4px); }
  90%       { transform: translateX(4px); }
}

@keyframes celebrate {
  0%   { transform: scale(0.8); opacity: 0; }
  60%  { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.shake {
  animation: shake 0.5s ease-in-out;
}

.celebrate {
  animation: celebrate 0.6s ease-out forwards;
}

.fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}

/* ─── Scrollable attempt area ────────────────────────────────────────────────── */
.attempts-area {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  overflow-y: auto;
  max-height: 35vh;
  padding-bottom: 4px;
}

.attempts-area:empty::after {
  content: 'No guesses yet';
  color: var(--text-dim);
  font-size: 0.85rem;
  padding: 16px;
  display: block;
  text-align: center;
}

/* ─── Responsive (> 480px) ───────────────────────────────────────────────────── */
@media (min-width: 480px) {
  body {
    padding: 0 16px;
  }

  .screen {
    padding-bottom: 48px;
  }

  .app-title {
    font-size: 2.8rem;
  }

  .key {
    min-height: 76px;
  }
}

@media (min-width: 768px) {
  .screen-content {
    padding: 40px 32px;
  }
}

/* ─── Prevent iOS zoom on input focus ────────────────────────────────────────── */
@media (max-width: 480px) {
  input, select, textarea {
    font-size: 16px;
  }

  .code-input {
    font-size: 1.6rem;
  }
}