:root{--bg:#3d362e;--surface:#4a4238;--accent:#c45c3e;--accent-hover:#d46b4a;--text:#f0ebe0;--text-muted:#b8ad9e;--board-line:#2d3748;--board-bg:#0f3460;--black-stone:#1a1a1a;--white-stone:#f5f5f5;--shadow:rgba(0,0,0,.35)}*{box-sizing:border-box}body{margin:0;font-family:'Segoe UI',system-ui,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;-webkit-tap-highlight-color:transparent}.app{min-height:100vh;padding:1rem;max-width:500px;margin:0 auto}.header{text-align:center;margin-bottom:1.5rem}.game-title{margin:0;font-size:1.75rem;font-weight:700;color:var(--text)}.game-subtitle{margin:.25rem 0 0;font-size:.95rem;color:var(--text-muted)}.screen{animation:fadeIn .25s ease}@keyframes fadeIn{from{opacity:0}to{opacity:1}}.screen.hidden{display:none!important}.screen-menu{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh}.menu-card{background:var(--surface);border-radius:12px;padding:1.75rem;width:100%;box-shadow:0 4px 20px var(--shadow)}.menu-card h2{margin:0 0 .5rem;font-size:1.35rem}.menu-desc{margin:0 0 1.25rem;color:var(--text-muted);font-size:.9rem}.difficulty-row,.lang-row{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem}.difficulty-row label,.lang-row label{min-width:80px;font-size:.9rem}.difficulty-row select,.lang-row select{flex:1;padding:.5rem .75rem;border-radius:8px;border:1px solid var(--board-line);background:var(--bg);color:var(--text);font-size:.95rem;cursor:pointer}.menu-buttons{display:flex;flex-direction:column;gap:.75rem;margin-top:1.25rem}.lang-row{margin-top:1.5rem;justify-content:center}.btn{padding:.75rem 1.25rem;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s,transform .1s}.btn:active{transform:scale(.98)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{background:var(--surface);color:var(--text);border:1px solid var(--board-line)}.btn-secondary:hover{background:var(--board-line)}.btn-small{padding:.4rem .8rem;font-size:.85rem}.btn-close{margin-top:1rem;width:100%;background:transparent;color:var(--text-muted);font-size:.9rem}.btn-close:hover{color:var(--text)}.screen-tutorial{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:1rem;background:rgba(0,0,0,.7);opacity:1;transition:opacity .2s}.screen-tutorial[aria-hidden="true"]{pointer-events:none;opacity:0}.tutorial-overlay{background:var(--surface);border-radius:12px;padding:1.5rem;max-width:380px;width:100%;box-shadow:0 8px 32px var(--shadow)}.tutorial-card h2{margin:0 0 1rem;font-size:1.25rem}.tutorial-step{min-height:4rem}.tutorial-step.hidden{display:none}.tutorial-step p{margin:0;line-height:1.5;color:var(--text-muted)}.tutorial-nav{display:flex;align-items:center;justify-content:space-between;margin-top:1.25rem;gap:.5rem}.tutorial-progress{font-size:.85rem;color:var(--text-muted)}.screen-game{display:flex;flex-direction:column;align-items:center}.game-header{display:flex;justify-content:space-between;align-items:center;width:100%;margin-bottom:.75rem}.turn-indicator{display:flex;align-items:center;gap:.5rem;font-size:.95rem}.stone-preview{width:18px;height:18px;border-radius:50%}.stone-black{background:radial-gradient(ellipse 60% 60% at 35% 35%,#3d3d3d,#1a1a1a);border:1px solid #2a2a2a;box-shadow:0 1px 3px rgba(0,0,0,.5)}.stone-white{background:radial-gradient(ellipse 70% 70% at 35% 30%,#fff,#e8e8e8);border:1px solid #b0b0b0;box-shadow:0 1px 2px rgba(0,0,0,.2)}.board-wrap{background:linear-gradient(145deg,#6B5344 0%,#5C4033 50%,#4A3728 100%);border-radius:10px;padding:14px;box-shadow:0 4px 16px rgba(0,0,0,.4),inset 0 1px 0 rgba(255,255,255,.08);border:1px solid rgba(0,0,0,.2)}#board{display:block;max-width:100%;height:auto;cursor:pointer;border-radius:6px;box-shadow:0 2px 8px rgba(0,0,0,.25)}.game-hint{margin-top:.75rem;font-size:.85rem;color:var(--text-muted)}.screen-result{position:fixed;inset:0;z-index:90;display:flex;align-items:center;justify-content:center;padding:1rem;background:rgba(0,0,0,.75);opacity:1;transition:opacity .2s}.screen-result.hidden{pointer-events:none;opacity:0}.result-overlay{background:var(--surface);border-radius:12px;padding:2rem;max-width:340px;width:100%;text-align:center;box-shadow:0 8px 32px var(--shadow)}.result-card .result-title{margin:0 0 .5rem;font-size:1.5rem}.result-card.win .result-title{color:#4ade80}.result-card.lose .result-title{color:var(--accent)}.result-card.draw .result-title{color:var(--text-muted)}.result-message{margin:0 0 1.5rem;color:var(--text-muted);font-size:.95rem}.result-actions{display:flex;flex-direction:column;gap:.75rem}@media (max-width:480px){#board{width:100%;height:auto}.board-wrap{padding:8px}.app{padding:.75rem}}@media (prefers-reduced-motion:reduce){.screen,.btn{animation:none;transition:none}}