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

:root {
  --bg: #0f0f1a;
  --bg-card: #1a1a2e;
  --text: #e8e8ed;
  --text-dim: #8888a0;
  --text-faint: #55556a;
  --amber: #f59e0b;
  --amber-glow: rgba(245, 158, 11, 0.15);
  --amber-dim: #b27308;
  --emerald: #10b981;
  --red: #ef4444;
  --purple: #8b5cf6;
  --border: #2a2a44;
  --radius: 12px;
  --radius-sm: 8px;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  touch-action: manipulation;
}

body { display: flex; flex-direction: column; max-width: 480px; margin: 0 auto; padding: 0 16px; }

.header { display: flex; align-items: center; justify-content: space-between; padding: 16px 0 12px; border-bottom: 1px solid var(--border); flex-shrink: 0; }
.header-left { display: flex; align-items: center; gap: 10px; }
.logo { display:flex; align-items:center; }
.logo img{width:auto;height:30px;max-width:180px;object-fit:contain;flex:0 0 auto;}
.puzzle-num { font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--text-dim); letter-spacing: 1px; }
.header-right { display: flex; gap: 8px; align-items: center; }
.header-btn { background: none; border: 1px solid var(--border); color: var(--text-dim); cursor: pointer; padding: 8px 10px; border-radius: var(--radius-sm); transition: color 0.2s, background 0.2s, border-color .2s; display: flex; align-items: center; justify-content: center; min-width: 40px; }
.header-btn:hover { color: var(--text); background: var(--bg-card); border-color: var(--text-dim); }
.header-btn i { font-size: 16px; }

/* Off-canvas menu */
.menu-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.45); opacity: 0; pointer-events: none; transition: opacity .22s ease; z-index: 140; }
.menu-overlay.visible { opacity: 1; pointer-events: auto; }
.offcanvas { position: fixed; top: 0; right: 0; width: min(88vw, 360px); height: 100vh; background: #111121; border-left: 1px solid var(--border); transform: translateX(100%); transition: transform .28s cubic-bezier(.34,1.02,.68,1); z-index: 150; padding: max(14px, env(safe-area-inset-top)) 16px 20px; overflow-y: auto; }
.offcanvas.open { transform: translateX(0); }
.offcanvas-head { display:flex; align-items:center; justify-content:space-between; margin-bottom: 14px; }
.offcanvas-title { font-family:'JetBrains Mono', monospace; font-size:13px; letter-spacing:2px; color: var(--text-dim); text-transform: uppercase; }
.menu-close { background:none; border:1px solid var(--border); color: var(--text-dim); border-radius:8px; width:34px; height:34px; cursor:pointer; }
.menu-section { background: var(--bg-card); border:1px solid var(--border); border-radius: 12px; padding: 10px; margin-bottom: 12px; }
.menu-item { width:100%; display:flex; align-items:center; gap:10px; padding:11px 10px; background:none; border:none; color:var(--text); text-align:left; cursor:pointer; border-radius:8px; font-size:14px; }
.menu-item:hover { background: rgba(255,255,255,.04); }
.menu-item i { width:18px; color: var(--amber); text-align:center; }
.lang-switcher { position: relative; }
.lang-btn { width:100%; background: none; border: 1px solid var(--border); color: var(--text); cursor: pointer; padding: 10px 12px; border-radius: 8px; font-size: 15px; line-height: 1; transition: border-color 0.15s, background 0.15s; display: flex; align-items: center; justify-content: space-between; }
.lang-current-value { display:flex; align-items:center; gap:10px; }
#lang-flag { font-size: 18px; }
#lang-label { font-size: 15px; color: var(--text); }
.lang-dropdown { position: static; margin-top: 8px; background: transparent; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; opacity: 1; transform: none; pointer-events: auto; transition: none; z-index: auto; min-width: 140px; box-shadow: none; display:none; }
.lang-dropdown.visible { display:block; }
.lang-option { display: flex; align-items: center; gap: 10px; width: 100%; padding: 10px 14px; background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 13px; text-align: left; }
.lang-option:hover { background: rgba(255,255,255,0.05); color: var(--text); }
.lang-option.active { color: var(--amber); }
.lang-option span { font-size: 18px; }

.stats-bar { display: flex; justify-content: center; gap: 32px; padding: 14px 0; flex-shrink: 0; }
.stat { text-align: center; }
.stat-label { font-size: 11px; text-transform: uppercase; letter-spacing: 2px; color: var(--text-dim); margin-bottom: 2px; }
.stat-value { font-family: 'JetBrains Mono', monospace; font-size: 20px; font-weight: 700; color: var(--text); }
.stat-value.amber { color: var(--amber); }

.chain-area { flex: 1; display: flex; flex-direction: column; align-items: center; padding: 16px 0; overflow-y: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
.chain-area::-webkit-scrollbar { display: none; }
.chain-inner { display: flex; flex-direction: column; align-items: center; width: 100%; max-width: 320px; gap: 0; }

.word-node { position: relative; width: 100%; text-align: center; padding: 14px 20px; font-family: 'JetBrains Mono', monospace; font-size: 22px; font-weight: 700; letter-spacing: 6px; text-transform: uppercase; border-radius: var(--radius); transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1); }
.word-node.start, .word-node.end { background: var(--bg-card); border: 2px solid var(--border); color: var(--text); }
.word-node.placed { background: var(--bg-card); border: 2px solid var(--amber); color: var(--amber); box-shadow: 0 0 20px var(--amber-glow); animation: slideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); }
.word-node.completed { border-color: var(--emerald); color: var(--emerald); box-shadow: 0 0 20px rgba(16, 185, 129, 0.15); }
.node-label { position: absolute; top: -8px; left: 20px; font-family: 'Inter', sans-serif; font-size: 10px; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; color: var(--text-faint); background: var(--bg); padding: 0 6px; }

.connector { display: flex; flex-direction: column; align-items: center; padding: 3px 0; }
.connector-line { width: 2px; height: 18px; background: var(--border); transition: background 0.3s; }
.connector-line.active { background: var(--amber); box-shadow: 0 0 8px var(--amber-glow); }
.connector-line.complete { background: var(--emerald); }
.compound-label { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: 2px; color: var(--amber-dim); text-transform: uppercase; padding: 2px 10px; background: var(--amber-glow); border-radius: 20px; white-space: nowrap; }

.gap { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 6px 0; transition: transform 0.45s cubic-bezier(0.34, 1.02, 0.68, 1); }
.gap-dot { width: 4px; height: 4px; border-radius: 50%; background: var(--text-faint); opacity: 0.4; }

.input-area { width: 100%; max-width: 320px; position: relative; z-index: 10; display: flex; flex-direction: column; }
.input-wrapper { position: relative; display: flex; align-items: center; }
.word-input { width: 100%; padding: 14px 48px 14px 16px; font-family: 'JetBrains Mono', monospace; font-size: 18px; font-weight: 500; letter-spacing: 4px; text-transform: uppercase; background: var(--bg-card); border: 2px solid var(--border); border-radius: var(--radius); color: var(--text); outline: none; transition: border-color 0.2s, box-shadow 0.2s; text-align: center; }
.word-input::placeholder { color: var(--text-faint); letter-spacing: 2px; font-size: 13px; text-transform: none; }
.word-input:focus { border-color: var(--amber); box-shadow: 0 0 20px var(--amber-glow); }
.input-submit { position: absolute; right: 8px; background: var(--amber); border: none; border-radius: var(--radius-sm); color: var(--bg); cursor: pointer; padding: 8px 10px; display: flex; align-items: center; justify-content: center; transition: opacity 0.2s; }
.input-submit:hover { opacity: 0.85; }
.input-submit svg { width: 18px; height: 18px; }

.autocomplete { position: relative; left: 0; right: 0; width: 100%; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); margin-top: 6px; max-height: 0; overflow: hidden; z-index: 10; scrollbar-width: thin; opacity: 0; transform: translateY(-4px); transition: max-height 0.45s cubic-bezier(0.34, 1.02, 0.68, 1), opacity 0.25s ease-out, transform 0.45s cubic-bezier(0.34, 1.02, 0.68, 1); border-color: transparent; pointer-events: none; }
.autocomplete.visible { max-height: 200px; opacity: 1; transform: translateY(0); border-color: var(--border); pointer-events: auto; overflow-y: auto; }
.autocomplete-item { padding: 11px 16px; font-family: 'JetBrains Mono', monospace; font-size: 14px; letter-spacing: 3px; text-transform: uppercase; color: var(--text-dim); cursor: pointer; transition: background 0.12s, color 0.12s, opacity 0.3s ease-out, transform 0.35s cubic-bezier(0.34, 1.02, 0.68, 1); border-bottom: 1px solid rgba(255,255,255,0.03); display: flex; justify-content: space-between; align-items: center; opacity: 0; transform: translateY(-6px); }
.autocomplete.visible .autocomplete-item { opacity: 1; transform: translateY(0); }
.autocomplete.visible .autocomplete-item:nth-child(1) { transition-delay: 0.03s; }
.autocomplete.visible .autocomplete-item:nth-child(2) { transition-delay: 0.06s; }
.autocomplete.visible .autocomplete-item:nth-child(3) { transition-delay: 0.09s; }
.autocomplete.visible .autocomplete-item:nth-child(4) { transition-delay: 0.12s; }
.autocomplete.visible .autocomplete-item:nth-child(5) { transition-delay: 0.15s; }
.autocomplete.visible .autocomplete-item:nth-child(6) { transition-delay: 0.18s; }
.autocomplete-item:last-child { border-bottom: none; }
.autocomplete-item:hover, .autocomplete-item.selected { background: var(--amber-glow); color: var(--amber); }
.compound-hint { font-size: 10px; color: var(--text-faint); letter-spacing: 1px; font-weight: 400; }
.autocomplete-item:hover .compound-hint, .autocomplete-item.selected .compound-hint { color: var(--amber-dim); }

.actions-bar { display: flex; justify-content: center; gap: 10px; padding: 12px 0 10px; flex-shrink: 0; }
.action-btn { font-family: 'Inter', sans-serif; font-size: 12px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; padding: 10px 18px; border-radius: var(--radius-sm); border: 1.5px solid var(--border); background: transparent; color: var(--text-dim); cursor: pointer; transition: all 0.2s; }
.legal-links { display:flex; justify-content:center; gap:10px; flex-wrap:wrap; padding: 0 0 14px; font-size:11px; }
.legal-links a { color: var(--text-faint); text-decoration: none; }
.legal-links a:hover { color: var(--text-dim); }
.action-btn:hover { border-color: var(--text-dim); color: var(--text); background: var(--bg-card); }
.action-btn:disabled { opacity: 0.3; cursor: default; }
.action-btn:disabled:hover { border-color: var(--border); color: var(--text-dim); background: transparent; }
.action-btn.hint { border-color: rgba(139, 92, 246, 0.4); color: var(--purple); }
.action-btn.hint:hover { background: rgba(139, 92, 246, 0.1); }

.modal-overlay { position: fixed; inset: 0; background: rgba(15, 15, 26, 0.88); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); display: none; align-items: center; justify-content: center; z-index: 100; padding: 24px; }
.modal-overlay.visible { display: flex; }
.modal { position: relative; background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 32px 28px; max-width: 360px; width: 100%; text-align: center; }
.modal-title { font-family: 'JetBrains Mono', monospace; font-size: 24px; font-weight: 700; letter-spacing: 6px; color: var(--amber); margin-bottom: 6px; }
.modal-subtitle { font-size: 14px; color: var(--text-dim); margin-bottom: 20px; }
.modal-chain { display: flex; flex-direction: column; align-items: center; gap: 3px; margin-bottom: 24px; }
.modal-chain .chain-word { font-family: 'JetBrains Mono', monospace; font-size: 14px; letter-spacing: 3px; color: var(--text); text-transform: uppercase; }
.modal-chain .chain-link { font-size: 10px; letter-spacing: 1px; color: var(--amber-dim); }
.modal-stats { display: flex; justify-content: center; gap: 28px; margin-bottom: 24px; }
.modal-stat { text-align: center; }
.modal-stat-label { font-size: 10px; text-transform: uppercase; letter-spacing: 2px; color: var(--text-dim); }
.modal-stat-val { font-family: 'JetBrains Mono', monospace; font-size: 26px; font-weight: 700; }
.modal-stat-val.gold { color: var(--amber); }
.modal-stat-val.green { color: var(--emerald); }
.modal-stat-val.white { color: var(--text); }
.stars { display: flex; gap: 4px; justify-content: center; margin-bottom: 16px; }
.star { font-size: 22px; color: var(--text-faint); opacity: 0.2; }
.star.filled { color: var(--amber); opacity: 1; }
.share-btn { font-family: 'Inter', sans-serif; font-size: 14px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; padding: 14px 40px; border-radius: var(--radius); border: none; background: var(--amber); color: var(--bg); cursor: pointer; transition: opacity 0.2s, transform 0.15s; width: 100%; margin-bottom: 10px; }
.share-btn:hover { opacity: 0.9; }
.share-btn:active { transform: scale(0.97); }
.auth-card { text-align: left; }
.auth-card .modal-title { text-align: center; }
.auth-card .modal-subtitle { text-align: center; margin-bottom: 16px; }
.auth-divider { display:flex; align-items:center; gap:10px; color:var(--text-faint); font-size:11px; letter-spacing:1px; text-transform:uppercase; margin: 8px 0 14px; }
.auth-divider::before, .auth-divider::after { content:""; height:1px; flex:1; background:var(--border); }
.apple-signin-link { display:flex; align-items:center; justify-content:center; gap:10px; text-decoration:none; font-family:'Inter',sans-serif; font-size:14px; font-weight:600; letter-spacing:.3px; padding:14px 16px; border-radius:var(--radius); border:1px solid rgba(255,255,255,.22); background:#111114; color:#fff; margin-bottom:10px; width:100%; appearance:none; -webkit-appearance:none; cursor:pointer; }
.apple-signin-link:hover { background:#1a1a1f; }
.auth-note { font-size:12px; color:var(--text-dim); text-align:center; margin: 6px 0 14px; line-height:1.45; }
.auth-note a { color: var(--amber); text-decoration: none; }
.auth-note a:hover { text-decoration: underline; }
.share-link-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 10px; }
.share-link-btn { display:flex; align-items:center; justify-content:center; gap:8px; text-align:center; text-decoration:none; font-family:'Inter',sans-serif; font-size:12px; font-weight:600; letter-spacing:.3px; text-transform:uppercase; padding:12px 10px; border-radius:var(--radius); border:1px solid rgba(245,158,11,.35); background:rgba(245,158,11,.12); color:var(--amber);}
.modal-close { position:absolute; top:10px; right:10px; width:30px; height:30px; display:flex; align-items:center; justify-content:center; font-family:'Inter',sans-serif; font-size:16px; color:var(--text-dim); background:none; border:none; cursor:pointer; padding:0; border-radius:8px; }
.modal-close:hover { color: var(--text); background: rgba(255,255,255,0.06); }

.how-to-play { text-align: left; }
.how-to-play h3 { font-family: 'JetBrains Mono', monospace; font-size: 13px; letter-spacing: 2px; color: var(--amber); margin: 16px 0 8px; text-transform: uppercase; }
.how-to-play p { font-size: 14px; color: var(--text-dim); line-height: 1.6; margin-bottom: 8px; }
.how-to-play .example { font-family: 'JetBrains Mono', monospace; font-size: 13px; background: var(--bg); padding: 12px; border-radius: var(--radius-sm); color: var(--text); margin: 8px 0 12px; letter-spacing: 1px; line-height: 1.8; }
.how-to-play .example span { color: var(--amber); }

.toast { position: fixed; top: 80px; left: 50%; transform: translateX(-50%) translateY(-20px); background: var(--bg-card); border: 1px solid var(--border); color: var(--text); padding: 10px 20px; border-radius: var(--radius-sm); font-family: 'Inter', sans-serif; font-size: 13px; font-weight: 500; opacity: 0; pointer-events: none; transition: opacity 0.25s, transform 0.25s; z-index: 50; white-space: nowrap; }
.toast.visible { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { border-color: var(--red); color: var(--red); }
.toast.success { border-color: var(--emerald); color: var(--emerald); }

@keyframes slideIn { from { opacity: 0; transform: translateY(-14px) scale(0.96); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes shake { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
.word-input.error { animation: shake 0.3s ease; border-color: var(--red) !important; }

@keyframes bridgeComplete {
  0% { border-color: var(--amber); box-shadow: 0 0 20px var(--amber-glow); }
  50% { border-color: var(--emerald); box-shadow: 0 0 30px rgba(16, 185, 129, 0.3); }
  100% { border-color: var(--emerald); box-shadow: 0 0 20px rgba(16, 185, 129, 0.15); }
}
.chain-complete .word-node { animation: bridgeComplete 0.6s ease forwards; }
.chain-complete .word-node:nth-child(1) { animation-delay: 0s; }
.chain-complete .word-node:nth-child(3) { animation-delay: 0.15s; }
.chain-complete .word-node:nth-child(5) { animation-delay: 0.3s; }
.chain-complete .word-node:nth-child(7) { animation-delay: 0.45s; }
.chain-complete .word-node:nth-child(9) { animation-delay: 0.6s; }
.chain-complete .word-node:nth-child(11) { animation-delay: 0.75s; }
.confetti-container { position: fixed; inset: 0; pointer-events: none; z-index: 200; overflow: hidden; }
.confetti { position: absolute; width: 8px; height: 8px; border-radius: 2px; top: -10px; animation: confettiFall 2.5s ease-in forwards; }
@keyframes confettiFall { 0% { transform: translateY(0) rotate(0deg); opacity: 1; } 100% { transform: translateY(100vh) rotate(720deg); opacity: 0; } }

@media (max-width: 430px) {
  .header { padding: max(12px, env(safe-area-inset-top)) 0 10px; }
  .logo img { height: 28px; max-width: 150px; }
}

@media (max-height: 680px) {
  .word-node { padding: 11px 16px; font-size: 18px; letter-spacing: 4px; }
  .connector-line { height: 12px; }
  .stats-bar { padding: 10px 0; gap: 24px; }
  .stat-value { font-size: 18px; }
}
@media (max-height: 580px) {
  .word-node { padding: 9px 14px; font-size: 16px; }
  .connector-line { height: 8px; }
  .connector { padding: 1px 0; }
}