*{box-sizing:border-box;margin:0;padding:0}:root{color:#263327;font-family:Nunito,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:#efe4cf;--paper: #f8f0de;--paper-deep: #eadcc2;--ink: #263327;--muted-ink: #66715f;--moss: #586f4d;--moss-dark: #344a37;--clay: #a96843;--seal: #b34b3e;--line: rgba(72, 79, 58, .22);--shadow: 0 20px 60px rgba(64, 48, 30, .14)}body{min-height:100vh;color:var(--ink);background:radial-gradient(circle at 18% 18%,rgba(255,250,234,.86),transparent 28%),radial-gradient(circle at 82% 8%,rgba(162,118,78,.1),transparent 26%),linear-gradient(115deg,rgba(73,99,69,.08),transparent 34%),#efe4cf}body:before{position:fixed;top:0;right:0;bottom:0;left:0;z-index:-1;pointer-events:none;content:"";background-image:linear-gradient(90deg,rgba(80,66,42,.035) 1px,transparent 1px),linear-gradient(0deg,rgba(80,66,42,.03) 1px,transparent 1px),radial-gradient(circle at 20% 30%,rgba(87,67,38,.06) 0 1px,transparent 1px),radial-gradient(circle at 74% 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minmax(320px,1.06fr);gap:clamp(28px,5vw,64px);width:100%;align-items:center}.brand-panel{position:relative;padding:clamp(18px,4vw,34px)}.brand-logo{width:clamp(108px,18vw,184px);height:clamp(108px,18vw,184px);object-fit:cover;border:1px solid rgba(51,64,42,.2);border-radius:50%;box-shadow:0 18px 38px #2f2b1f29}.brand-kicker{margin-top:28px;color:var(--clay);font-size:.95rem;letter-spacing:.18em}.brand-title{margin-top:8px;color:var(--ink);font-family:STKaiti,KaiTi,Songti SC,serif;font-size:clamp(3.25rem,9vw,7rem);font-weight:700;line-height:.98;letter-spacing:0}.brand-theme{max-width:560px;margin-top:22px;color:var(--moss-dark);font-size:clamp(1.18rem,2.8vw,1.76rem);line-height:1.65}.brand-copy{max-width:560px;margin-top:18px;color:var(--muted-ink);font-size:1rem;line-height:1.9}.seal-mark{display:inline-grid;width:58px;height:58px;margin-top:28px;place-items:center;color:var(--seal);font-family:STKaiti,KaiTi,serif;font-size:1rem;line-height:1.05;border:2px solid 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SC,serif;font-size:clamp(2rem,4vw,3rem);line-height:1.15}.feature-desc{margin-top:18px;color:var(--muted-ink);font-size:1.02rem;line-height:1.8}.feature-action{display:inline-flex;align-items:center;gap:8px;margin-top:28px;color:var(--moss-dark);font-weight:800}.page-header{position:relative;display:grid;gap:14px;margin:18px auto 32px;text-align:center}.page-title{color:var(--ink);font-family:STKaiti,KaiTi,Songti SC,serif;font-size:clamp(2.5rem,7vw,4.75rem);line-height:1.1;letter-spacing:0}.page-subtitle{max-width:660px;margin:0 auto;color:var(--muted-ink);font-size:clamp(1rem,2.3vw,1.25rem);line-height:1.8}.nav-row{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:24px}.btn{display:inline-flex;min-height:44px;align-items:center;justify-content:center;gap:8px;padding:10px 18px;color:#fff8ea;background:var(--moss-dark);border:1px solid rgba(30,51,37,.18);border-radius:999px;box-shadow:0 12px 26px #31392729;font-size:.98rem;font-weight:800;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,background .18s ease}.btn:hover{transform:translateY(-2px);box-shadow:0 16px 30px #31392733}.btn:active{transform:translateY(0)}.btn-primary{background:var(--clay)}.btn-secondary{background:var(--moss-dark)}.btn-quiet{color:var(--moss-dark);background:#fff9ebb8;border-color:var(--line)}.paper-card,.card{padding:22px}.tool-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;max-width:920px;margin:0 auto}.tool-card{min-height:210px;padding:26px;text-align:left}.tool-card .feature-icon{margin-bottom:22px}.hint-card{max-width:680px;margin:36px auto 0;padding:18px 20px;color:var(--muted-ink);text-align:center;line-height:1.8}.tab-row{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-bottom:30px}.pinyin-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(138px,1fr));gap:16px;max-width:1000px;margin:0 auto}.pinyin-card{min-height:168px;padding:22px 14px;text-align:center;cursor:pointer;opacity:0;transition:border-color .18s ease,background .18s ease}.pinyin-card.is-selected{background:linear-gradient(135deg,#efe5cbf2,#d5e1c6e6),var(--paper);border-color:#586f4d94}.pinyin-image{margin-bottom:10px;font-size:2.7rem}.pinyin-font{color:var(--moss-dark);font-family:Nunito,Arial,sans-serif;font-size:2rem;font-weight:900}.pinyin-hanzi{margin-top:6px;color:var(--muted-ink);font-size:1.08rem}.status-row{display:flex;align-items:center;gap:10px}.status-pill{display:inline-flex;min-height:42px;align-items:center;justify-content:center;padding:8px 14px;color:var(--moss-dark);background:#fff9ebcc;border:1px solid var(--line);border-radius:999px;box-shadow:0 10px 24px #40301e14;font-weight:900;white-space:nowrap}.math-stage{min-height:calc(100vh - 160px);display:grid;place-items:center;padding-bottom:7vh}.question-card{display:grid;gap:30px;justify-items:center}.question-line{display:flex;align-items:center;gap:clamp(10px,4vw,24px);color:var(--ink);font-size:clamp(4rem,14vw,7rem);font-weight:900;line-height:1}.question-line span:not(.operator){width:clamp(86px,16vw,132px)}.question-line span:first-child{text-align:right}.operator{color:var(--clay)}.answer-input{width:min(190px,48vw);height:min(128px,30vw);color:var(--ink);background:#fffaeeeb;border:2px solid rgba(88,111,77,.42);border-radius:8px;outline:none;box-shadow:inset 0 0 0 5px #ffffff4d,var(--shadow);font-size:clamp(3.8rem,12vw,5rem);font-weight:900;text-align:center}.answer-input:focus{border-color:var(--moss)}.score-card{width:min(500px,100%);text-align:center}.score-title{margin-bottom:12px;color:var(--ink);font-size:2rem}.score-stars{display:flex;justify-content:center;gap:8px;margin-bottom:10px;font-size:2.4rem}.score-number{margin-bottom:16px;color:var(--clay);font-size:2.6rem;font-weight:900}.score-meta{margin-bottom:10px;color:var(--muted-ink);font-size:1.12rem}.score-meta strong{color:var(--ink);font-size:1.35rem}.accuracy{margin:20px 0 28px;padding:12px;color:var(--ink);background:#d5e1c675;border-radius:8px;font-size:1.12rem}.score-actions{display:flex;gap:12px;justify-content:center}.game-meta{display:flex;justify-content:space-between;gap:12px;padding-top:15px;margin-top:14px;border-top:1px solid var(--line);color:var(--muted-ink)}.game-start{color:var(--moss-dark);font-weight:900}@media (max-width: 820px){.home-shell{align-items:flex-start}.home-layout,.entry-grid{grid-template-columns:1fr}.brand-panel{padding-top:8px}.feature-card{min-height:auto}.nav-row{align-items:flex-start;flex-direction:column}.status-row{width:100%;flex-wrap:wrap}.score-actions{flex-direction:column}}