:root{--bg:#f8f7f2;--panel:#fffdf8;--ink:#232923;--muted:#586357;--line:#dcded1;--green:#285444;--dark:#193b2f;--mint:#e6eee2;--gold:#eee5d3;--red:#a13038;--serif:"Baskervville","Songti SC",SimSun,serif}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);margin:0;font:16px/1.55 Inter,PingFang SC,Microsoft YaHei,sans-serif}h1,h2,p,ol{margin:0}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.62}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--green);outline-offset:3px}h1{font-family:var(--serif);letter-spacing:-.03em;font-size:clamp(2.1rem,4vw,3.35rem);font-weight:700;line-height:1.14}h2{font-size:1.3rem;line-height:1.3}.muted,small{color:var(--muted)}.open{color:var(--green)}.button{border:1px solid var(--line);background:var(--panel);white-space:normal;text-align:center;border-radius:8px;justify-content:center;align-items:center;gap:.35rem;min-height:43px;padding:.53rem 1rem;font-weight:600;display:inline-flex}.button:hover:not(:disabled){background:var(--mint);border-color:#b7c7b8}.button.primary{background:var(--green);color:#fff;border-color:var(--green)}.button.primary:hover:not(:disabled){background:var(--dark);border-color:var(--dark)}.button.subtle{color:var(--green);background:0 0;border-color:#0000;padding-inline:.5rem}.button.done{color:var(--green);background:var(--mint)}.button.small{min-height:36px;padding:.25rem .65rem}.text-link,.back{color:var(--green);font-weight:600}.text-link{text-align:left;background:0 0;border:0;padding:0}.text-link:hover,.back:hover{text-decoration:underline}.brand{letter-spacing:.08em;white-space:nowrap;align-items:center;gap:.7rem;font-size:1.04rem;font-weight:700;display:inline-flex}.brand-symbol{background:var(--green);color:#fff;width:35px;height:35px;font:700 18px var(--serif);border-radius:50%;place-items:center;display:grid}.login-layout{grid-template-columns:minmax(430px,1fr) 1fr;gap:16px;min-height:100svh;padding:16px;display:grid}.login-main{flex-direction:column;justify-content:space-between;align-items:flex-start;min-height:calc(100svh - 32px);padding:26px clamp(18px,4vw,62px) 21px;display:flex}.login-box{align-self:center;width:min(100%,385px);margin:52px 0}.login-box h1{margin-bottom:13px}.login-box .form-stack{margin-top:32px}.login-box .form-stack label{gap:9px}.login-box 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small{background:var(--panel);z-index:1;min-width:10rem;padding:8px;position:absolute;top:100%;right:0}.container{width:min(100% - 48px,1142px);margin:auto;padding-block:46px 64px}.page-heading{justify-content:space-between;align-items:baseline;gap:14px;margin-bottom:22px;display:flex}.page-heading span{white-space:nowrap;font-size:.91rem}.empty{text-align:center;color:var(--muted);background:var(--panel);border:1px dashed #c6cebd;border-radius:13px;justify-items:center;gap:16px;padding:48px 20px;display:grid}.course-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;display:grid}.course-card{background:var(--panel);border:1px solid var(--line);border-radius:13px;flex-direction:column;display:flex;overflow:hidden}.card-cover-link{display:block}.cover{aspect-ratio:16/9;background:#e0e5d9;overflow:hidden}.cover img{object-fit:cover;width:100%;height:100%;display:block}.cover-empty{background:linear-gradient(135deg,#b5c7ad,#f0e9d8)}.card-body{flex:1;grid-template-rows:auto auto 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h1{overflow-wrap:anywhere;font-size:clamp(1.9rem,3.6vw,3rem)}.course-price{font-size:1.22rem}.description{white-space:pre-wrap;color:var(--muted)}.lesson-section{margin-top:37px}.lesson-list,.admin-lessons{border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:0;list-style:none;overflow:hidden}.lesson-list li+li,.admin-lessons li+li{border-top:1px solid var(--line)}.lesson-list a,.lesson-list li>div{grid-template-columns:40px 1fr auto;align-items:center;gap:12px;padding:13px 17px;display:grid}.lesson-list a:hover{background:var(--mint)}.lesson-num{min-height:35px;color:var(--muted);background:#efefe6;border-radius:6px;place-items:center;display:grid}.lesson-status{color:var(--muted);white-space:nowrap;font-size:.84rem}.lesson-status.open{color:var(--green)}.watch-heading{margin-block:20px}.watch-heading h1{overflow-wrap:anywhere;margin-top:5px;font-size:clamp(1.7rem,3.8vw,3rem)}.player{aspect-ratio:16/9;background:#171a17;border-radius:12px;width:100%;max-height:65svh;display:block}.watch-actions{justify-content:space-between;align-items:flex-start;gap:14px;margin-top:17px;display:flex}.checkin-action{justify-items:start;gap:6px;display:grid}.admin{padding-top:26px}.admin-nav{border-bottom:1px solid var(--line);gap:22px;margin-bottom:30px;display:flex}.admin-nav button{background:0 0;border:0;border-bottom:2px solid #0000;padding:10px 0}.admin .page-heading h1{font-size:clamp(1.75rem,3.4vw,2.65rem)}.panel{border:1px solid var(--line);background:var(--panel);border-radius:12px;min-width:0;padding:20px}.panel>h2{margin-bottom:13px}.panel>p{margin-top:12px}.admin-grid{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:18px;display:grid}.course-admin-grid{grid-template-columns:minmax(0,4fr) minmax(0,5fr)}.admin-grid .form-stack{margin-top:14px}.form-stack 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li{padding:12px}.lesson-admin-heading{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.lesson-admin-heading strong{overflow-wrap:anywhere;margin-right:auto}.admin details{margin-top:8px}.admin summary{cursor:pointer;color:var(--green);font-size:.88rem;font-weight:650}.admin details .upload{margin-top:16px}@media (max-width:880px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.admin-grid{grid-template-columns:1fr}.login-main{padding-inline:22px}}@media (max-width:640px){.login-layout{flex-direction:column-reverse;gap:0;padding:0;display:flex}.login-image{background-position:50% 46%;border-radius:0;height:clamp(175px,28svh,230px);min-height:0}.login-main{min-height:calc(100svh - clamp(175px,28svh,230px));padding:19px 22px 17px}.login-box{margin:25px 0 28px}.login-box .form-stack{margin-top:22px}.top-inner{flex-wrap:wrap;gap:7px 12px;min-height:0;padding:9px 16px 0}.top-user{margin-left:auto;padding-bottom:5px}.top-nav{flex-basis:100%;order:3;gap:19px}.top-nav a{padding:8px 0 10px}.top-user>span:first-child{max-width:18vw}.container{width:calc(100% - 32px);padding-block:25px 42px}.course-grid{grid-template-columns:1fr;gap:15px}.course-hero{grid-template-columns:1fr;gap:17px}.watch-actions{flex-wrap:wrap}.panel{padding:13px}.lesson-list a,.lesson-list li>div{grid-template-columns:32px 1fr auto;gap:8px;padding:11px}}