.simple-home{background:var(--background);flex-direction:column;min-height:100dvh;display:flex;overflow:hidden}.simple-header{text-align:center;flex-direction:column;align-items:center;padding:clamp(34px,5vh,58px) 24px 0;display:flex}.brand{width:max-content;min-height:44px;color:var(--blue-600);letter-spacing:-.04em;white-space:nowrap;align-items:center;gap:11px;font-size:23px;font-weight:850;display:inline-flex}.brand-mark{object-fit:cover;border-radius:11px;flex:none;width:42px;height:42px}.simple-header p{color:var(--ink-soft);margin:13px 0 0;font-size:14px;line-height:1.7}.login-stage{flex-direction:column;align-items:center;width:min(620px,100% - 32px);margin:auto;padding:clamp(22px,3vh,38px) 0 clamp(28px,4vh,46px);display:flex}.study-animation{-webkit-user-select:none;user-select:none;width:min(100%,560px);line-height:0;transform:translateY(calc(-1*clamp(38px,6vh,68px)))}.study-animation>svg{width:100%;height:auto;overflow:visible}.animation-halo{transform-origin:280px 179px}.halo-one{fill:var(--blue-50);animation:15s linear infinite halo-turn}.halo-two{fill:none;stroke:var(--blue-100);stroke-width:3px;stroke-dasharray:8 12;transform-origin:280px 179px;animation:11s linear infinite reverse halo-turn}.orbit-group{transform-origin:280px 179px;animation:18s linear infinite orbit-turn}.orbit-line{fill:none;stroke:var(--blue-300);stroke-opacity:.7;stroke-width:2px;stroke-dasharray:5 10}.orbit-dot{fill:#74ceef;stroke:#fff;stroke-width:5px}.orbit-dot-small{fill:var(--yellow);stroke-width:3px}.floating-chip rect,.progress-pill rect{fill:var(--blue-100)}.chip-pi rect{fill:var(--chip-pi-surface)}.chip-check rect{fill:var(--chip-check-surface)}.progress-pill rect{fill:var(--progress-pill-surface)}.floating-chip text{fill:var(--blue-600);font-size:24px;font-weight:900;font-family:var(--font-geist-sans), sans-serif}.floating-chip path{fill:none;stroke:#36a88a;stroke-width:5px;stroke-linecap:round;stroke-linejoin:round}.chip-a{animation:3.4s ease-in-out infinite chip-float}.chip-pi{animation:3.8s ease-in-out .7s infinite chip-float}.chip-pi text{fill:var(--chip-pi-text)}.chip-check{animation:3.2s ease-in-out 1.1s infinite chip-float}.book-group{transform-origin:280px 225px;animation:3.4s ease-in-out infinite book-float}.book-cover{fill:var(--blue-400)}.book-page{fill:#fff}.book-center{fill:none;stroke:#c8e2ec;stroke-width:2px}.page-line{fill:none;stroke:#c7dae3;stroke-width:5px;stroke-linecap:round}.line-one{animation:2.8s ease-in-out infinite line-pulse}.line-two{animation:2.8s ease-in-out 1.4s infinite line-pulse}.question-badge{fill:var(--blue-500);stroke:#fff;stroke-width:7px}.question-mark{fill:#fff;font-size:35px;font-weight:900;font-family:var(--font-geist-sans), sans-serif}.progress-pill{animation:3.6s ease-in-out .3s infinite chip-float}.progress-pill circle{fill:var(--blue-100)}.progress-pill path{fill:none;stroke:var(--blue-600);stroke-width:2.5px;stroke-linecap:round;stroke-linejoin:round}.progress-pill text{fill:var(--ink-soft);font-size:9px;font-weight:750;font-family:var(--font-geist-sans), sans-serif}.progress-pill .progress-count{fill:var(--ink);font-size:11px;font-weight:900}.spark path{fill:none;stroke:var(--yellow);stroke-width:4px;stroke-linecap:round}.spark-one{transform-origin:176px 83px;animation:2.2s ease-in-out infinite spark-pulse}.spark-two{transform-origin:394px 307px;animation:2.2s ease-in-out 1.1s infinite spark-pulse}.spark-two path{stroke:var(--blue-300)}.wechat-login{color:#123b27;letter-spacing:.03em;background:#07c160;border-radius:13px;justify-content:center;align-items:center;gap:11px;width:min(330px,100%);height:54px;margin-top:5px;font-size:15px;font-weight:850;transition:transform .14s,background .14s,box-shadow .14s;display:inline-flex;box-shadow:0 5px #059c4d}.wechat-login:hover{background:#0bc968;transform:translateY(-1px);box-shadow:0 6px #059c4d}.wechat-login:active{box-shadow:none;transform:translateY(4px)}.wechat-icon{color:#123b27;flex:none;width:27px;height:27px}.simple-footer{border-top:1px solid var(--line);min-height:64px;color:var(--muted);text-align:center;justify-content:center;align-items:center;padding:20px 24px;font-size:11px;display:flex}@keyframes orbit-turn{to{transform:rotate(360deg)}}@keyframes halo-turn{to{transform:rotate(360deg)}}@keyframes book-float{0%,to{transform:translateY(2px)rotate(-1deg)}50%{transform:translateY(-8px)rotate(1deg)}}@keyframes chip-float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes line-pulse{0%,to{opacity:.48}50%{opacity:1}}@keyframes spark-pulse{0%,to{opacity:.35;transform:scale(.75)rotate(0)}50%{opacity:1;transform:scale(1.15)rotate(90deg)}}@media (max-width:640px){.simple-header{padding-top:27px}.brand{gap:9px;font-size:20px}.brand-mark{width:37px;height:37px}.simple-header p{margin-top:10px;font-size:12px}.login-stage{width:min(100% - 30px,520px);padding-top:10px;padding-bottom:25px}.study-animation{width:min(100%,430px)}.wechat-login{height:52px;margin-top:0}.simple-footer{min-height:55px}}@media (max-height:700px) and (min-width:641px){.simple-header{padding-top:25px}.simple-header p{margin-top:8px}.login-stage{width:510px;padding:8px 0 20px}.study-animation{width:440px}.wechat-login{height:50px}.simple-footer{min-height:52px}}