:root{--font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Source Han Sans SC","WenQuanYi Micro Hei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;--font-heading:"Avenir Next","Avenir","Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;--bg:#f3efe7;--bg-strong:#e6ded1;--surface:#fffaf0;--surface-2:#f5ecde;--text:#1e2a2f;--text-soft:#506067;--line:#dccfb8;--accent:#0f7a6a;--accent-2:#d0812b;--danger:#a23232;--radius:16px}*{box-sizing:border-box}body,html{margin:0;padding:0;min-height:100%}body{color:var(--text);background:radial-gradient(circle at 0 0,#f6e7cd 0,transparent 50%),radial-gradient(circle at 100% 20%,#d4efe3 0,transparent 42%),var(--bg);font-family:var(--font-body),sans-serif}a{color:inherit;text-decoration:none}.container{width:min(1140px,calc(100% - 2rem));margin:0 auto}.topbar{position:-webkit-sticky;position:sticky;top:0;z-index:20;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid color-mix(in srgb,var(--line),#ffffff 28%);background:color-mix(in srgb,var(--bg),#ffffff 36%)}.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:72px}.brand{font-family:var(--font-heading),sans-serif;font-size:1rem;letter-spacing:.15em;font-weight:700}.nav-links{display:flex;align-items:center;gap:1rem;color:var(--text-soft);font-weight:500}.nav-links a:hover{color:var(--text)}.auth-actions{display:flex;align-items:center;gap:.6rem}.btn{border:1px solid transparent;border-radius:999px;padding:.56rem 1rem;font-weight:600;cursor:pointer;transition:transform .16s ease,box-shadow .16s ease}.btn:hover{transform:translateY(-1px)}.btn.solid{color:#fff;background:linear-gradient(120deg,var(--accent),#0e5d7a);box-shadow:0 8px 16px rgba(10,66,88,.24)}.btn.ghost{border-color:var(--line);color:var(--text);background:color-mix(in srgb,var(--surface),#ffffff 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var(--line);border-radius:16px;padding:.8rem;min-height:280px;max-height:420px;overflow-y:auto;background:color-mix(in srgb,var(--surface),#ffffff 45%)}.chat-item{margin-bottom:.75rem;padding:.6rem .7rem;border-radius:10px;max-width:min(92%,640px)}.chat-item.user{margin-left:auto;background:color-mix(in srgb,var(--accent),#ffffff 80%)}.chat-item.assistant{background:color-mix(in srgb,var(--accent-2),#ffffff 84%)}.chat-hero{position:relative;overflow:hidden}.chat-hero:after{content:"";position:absolute;inset:auto -40px -52px auto;width:220px;height:220px;border-radius:999px;opacity:.18;pointer-events:none}.chat-hero-text:after{background:radial-gradient(circle,#2ca58d 0,transparent 68%)}.chat-hero-game:after{background:radial-gradient(circle,#d0812b 0,transparent 72%)}.chat-mode-pill.text{border-color:color-mix(in srgb,var(--accent),#ffffff 42%);color:color-mix(in srgb,var(--accent),#133844 35%)}.chat-mode-pill.game{border-color:color-mix(in srgb,var(--accent-2),#ffffff 42%);color:color-mix(in srgb,var(--accent-2),#5d2c00 30%)}.text-mode-tip{border-style:dashed}.game-stage{border:1px solid color-mix(in srgb,var(--accent-2),#ffffff 35%);border-radius:14px;padding:.9rem;background:linear-gradient(140deg,#fff4e8,#fffaf0 65%)}.game-intake-stage{border:1px solid color-mix(in srgb,var(--accent),#ffffff 35%);border-radius:14px;padding:.9rem;background:linear-gradient(140deg,#eef9f4,#f8fffc 65%)}.game-stage-head{margin-bottom:.3rem}.game-stage h3{margin:0 0 .5rem;font-family:var(--font-heading),sans-serif}.game-stage p{margin:0 0 .8rem;color:var(--text-soft);line-height:1.6}.game-intake-stage h3{margin:0 0 .5rem;font-family:var(--font-heading),sans-serif}.game-intake-stage p{margin:0 0 .8rem;color:var(--text-soft);line-height:1.6}.game-options-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:.55rem;gap:.55rem}.game-option-btn{border-radius:12px;border:1px solid color-mix(in srgb,var(--accent-2),#ffffff 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