/* ================================
   五子棋 - 自定义样式
   ================================ */
:root{--bg:#FAFAF9;--bg-alt:#F5F5F4;--surface:#FFFFFF;--border:#E7E5E4;--border-strong:#D6D3D1;--text:#1E293B;--text-secondary:#52525B;--text-muted:#71717A;--primary:#4F46E5;--primary-hover:#4338CA;--primary-light:rgba(79,70,229,.08);--secondary:#F97316;--accent:#EC4899;--success:#059669;--radius:10px;--radius-lg:14px;--radius-xl:20px;--shadow-sm:0 1px 2px rgba(0,0,0,.04);--shadow:0 4px 12px rgba(0,0,0,.06);--shadow-lg:0 12px 32px rgba(0,0,0,.08)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter','Noto Sans SC',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}
.toast{position:fixed;top:24px;right:24px;background:var(--text);color:var(--bg);padding:10px 18px;border-radius:100px;font-size:14px;font-weight:500;display:flex;align-items:center;gap:8px;z-index:1000;transform:translateX(calc(100% + 40px));transition:transform .3s cubic-bezier(.34,1.56,.64,1);box-shadow:0 4px 16px rgba(0,0,0,.12)}
.toast.show{transform:translateX(0)}
.toast-dot{width:8px;height:8px;background:var(--success);border-radius:50%}
.page{max-width:960px;margin:0 auto;padding:0 32px}
#header.scrolled{background:rgba(255,255,255,.95);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 2px 20px rgba(0,0,0,.06)}
.game-section{padding:32px 0 24px}
.game-wrapper{display:flex;flex-direction:column;align-items:center;gap:20px}
.game-container{position:relative;background:#DEB887;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg)}
.game-canvas{display:block;cursor:pointer}
.game-info{display:flex;align-items:center;gap:24px;padding:12px 24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
.info-item{display:flex;flex-direction:column;align-items:center}
.info-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted)}
.info-value{font-size:20px;font-weight:700;color:var(--text)}
.game-controls{display:flex;gap:12px}
.btn-game{padding:12px 28px;border-radius:100px;font-family:inherit;font-size:15px;font-weight:600;cursor:pointer;transition:all .2s ease;border:none}
.btn-game--primary{background:linear-gradient(135deg,#78716C 0%,#44403C 100%);color:#fff;box-shadow:0 4px 12px rgba(120,113,108,.35)}
.btn-game--primary:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(120,113,108,.45)}
.btn-game--secondary{background:var(--bg-alt);color:var(--text-secondary);border:1px solid var(--border)}
.btn-game--secondary:hover{background:var(--primary-light);border-color:rgba(79,70,229,.25)}
.game-tips{font-size:13px;color:var(--text-muted);text-align:center}
.guide-section{margin-top:16px;margin-bottom:64px;background:#fff;border:1px solid var(--border);border-radius:12px;overflow:hidden}
.guide-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;padding:14px 20px;background:none;border:none;cursor:pointer;transition:background .15s ease}
.guide-toggle:hover{background:var(--bg-alt)}
.guide-toggle-title{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:#1E293B}
.guide-toggle.open .toggle-arrow{transform:rotate(180deg)}
.toggle-arrow{transition:transform .2s ease;color:var(--text-muted)}
.guide-list{padding:0 20px 20px}
.guide-list.hidden{display:none}
.guide-item{padding:16px 0;border-top:1px solid var(--border)}
.guide-item:first-child{border-top:1px solid var(--border)}
.guide-item-title{font-size:14px;font-weight:600;color:#1E293B;margin-bottom:6px}
.guide-item-body{font-size:13px;color:var(--text-secondary);line-height:1.8}
::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f5f9}::-webkit-scrollbar-thumb{background:#A5B4FC;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#4F46E5}
::selection{background:rgba(79,70,229,.2);color:#1E293B}
@media(max-width:768px){.page{padding:0 16px}.game-info{gap:16px;padding:10px 16px}.game-controls{flex-direction:column}.btn-game{width:100%}}