:root{color-scheme:light dark;--bg: radial-gradient(circle at top left, #18122b, #0f172a);--card-bg: rgba(15, 23, 42, .9);--card-border: rgba(148, 163, 184, .2);--accent: #38bdf8;--accent-soft: rgba(56, 189, 248, .12);--accent-strong: rgba(56, 189, 248, .4);--success: #4ade80;--success-soft: rgba(74, 222, 128, .12);--error: #fb7185;--error-soft: rgba(251, 113, 133, .12);--text-main: #e5e7eb;--text-muted: #9ca3af;--chip-bg: rgba(15, 23, 42, .8);--chip-border: rgba(148, 163, 184, .35);--chip-hover: rgba(56, 189, 248, .26);--shadow-soft: 0 24px 80px rgba(15, 23, 42, .8);--radius-lg: 24px;--radius-pill: 999px;--transition-fast: .14s ease-out}*,*:before,*:after{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:system-ui,-apple-system,BlinkMacSystemFont,SF Pro Text,Inter,sans-serif;color:var(--text-main);background-image:var(--bg);background-attachment:fixed;display:flex;align-items:center;justify-content:center}.app-root{width:100%;max-width:960px;padding:32px 16px 40px}.app-header{text-align:center;margin-bottom:24px}.app-header h1{margin:0 0 8px;font-size:clamp(1.9rem,3vw,2.4rem);letter-spacing:.04em}.subtitle{margin:0;color:var(--text-muted);font-size:.98rem}.game-card{position:relative;background:var(--card-bg);border-radius:var(--radius-lg);border:1px solid var(--card-border);padding:24px 22px 18px;box-shadow:var(--shadow-soft);overflow:hidden}.game-card:before{content:"";position:absolute;inset:-40%;background:radial-gradient(circle at top right,rgba(56,189,248,.06),transparent 60%);opacity:.8;pointer-events:none}.game-meta{display:flex;justify-content:flex-start;margin-bottom:10px}.pill{display:inline-flex;align-items:center;padding:4px 12px;border-radius:var(--radius-pill);background:#0f172ae6;border:1px solid rgba(148,163,184,.35);font-size:.78rem;text-transform:uppercase;letter-spacing:.09em;color:var(--text-muted)}.prompt{position:relative;margin:4px 0 16px;font-weight:500;letter-spacing:.01em}.sentence{position:relative;display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}.word-chip{position:relative;border:1px solid var(--chip-border);background:var(--chip-bg);color:var(--text-main);border-radius:var(--radius-pill);padding:6px 14px;font-size:.98rem;cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast),background-color var(--transition-fast),border-color var(--transition-fast);box-shadow:0 0 #38bdf800}.word-chip:hover{transform:translateY(-1px);border-color:var(--accent-strong);background:var(--accent-soft);box-shadow:0 8px 24px #0f172acc}.word-chip:active{transform:translateY(0);box-shadow:0 2px 8px #0f172ab3}.word-correct{border-color:var(--success);background:var(--success-soft)}.word-wrong{border-color:var(--error);background:var(--error-soft)}.word-highlight{animation:pulse .9s ease-out infinite}@keyframes pulse{0%{box-shadow:0 0 #38bdf873}70%{box-shadow:0 0 0 8px #38bdf800}to{box-shadow:0 0 #38bdf800}}.feedback{margin-bottom:16px}.hint{margin:0;color:var(--text-muted);font-size:.9rem}.feedback-panel{border-radius:18px;padding:10px 12px;margin:0;border:1px solid transparent;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.feedback-panel h2{margin:0 0 2px;font-size:1.02rem}.feedback-panel p{margin:0;font-size:.9rem}.feedback-panel.success{background:linear-gradient(135deg,#16a34a29,#22c55e0f);border-color:#22c55e80}.feedback-panel.error{background:linear-gradient(135deg,#f8717129,#f871710f);border-color:#f8717199}.controls{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:4px}.nav-button{border-radius:var(--radius-pill);font-size:.95rem;padding:8px 16px;border:1px solid transparent;cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:background-color var(--transition-fast),color var(--transition-fast),border-color var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast)}.nav-button.primary{background:linear-gradient(135deg,#38bdf8,#0ea5e9);color:#0b1120;box-shadow:0 12px 40px #38bdf859}.nav-button.primary:hover{transform:translateY(-1px);box-shadow:0 16px 54px #38bdf873}.nav-button.primary:disabled{opacity:.5;cursor:default;box-shadow:none}.nav-button.ghost{background:transparent;border-color:#94a3b866;color:var(--text-muted)}.nav-button.ghost:hover{border-color:var(--accent-strong);color:var(--accent);background:#0f172acc}.footer-note{margin-top:14px;text-align:center;font-size:.85rem;color:var(--text-muted)}.footer-note code{background:#0f172ae6;border-radius:999px;padding:3px 9px;border:1px solid rgba(148,163,184,.35)}@media(max-width:640px){.game-card{padding:20px 16px 16px}.sentence{gap:6px}.word-chip{padding:5px 11px;font-size:.9rem}.controls{flex-direction:column-reverse;align-items:stretch}.nav-button{justify-content:center}}