:root{--ink:#17231f;--muted:#65726d;--paper:#f7f8f3;--card:#fff;--green:#176b4c;--green-dark:#0d4f37;--mint:#d9efe3;--coral:#ec6b4f;--line:#dfe6df;--shadow:0 22px 60px rgba(25,56,44,.12);font-family:"Microsoft YaHei UI","PingFang SC",system-ui,sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0;min-height:100vh;background:linear-gradient(135deg,#f5f7f0 0%,#eef5ee 55%,#f7efe7 100%);overflow-x:hidden}button,input,select,textarea{font:inherit}button{cursor:pointer}.hidden{display:none!important}.background-orb{position:fixed;border-radius:50%;filter:blur(1px);opacity:.55;pointer-events:none}.orb-one{width:420px;height:420px;background:#cce8d8;top:-170px;right:-100px}.orb-two{width:340px;height:340px;background:#f2d6bd;bottom:-160px;left:-100px}.auth-shell{position:relative;z-index:1;min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr;max-width:1180px;margin:auto;padding:48px;align-items:center;gap:80px}.brand-mark{display:grid;place-items:center;width:92px;height:78px;border-radius:24px;background:var(--green);color:white;font-size:28px;font-weight:900;font-family:serif;letter-spacing:.06em;box-shadow:0 14px 28px rgba(23,107,76,.25);transform:rotate(-4deg)}.brand-mark.small{width:56px;height:43px;border-radius:13px;font-size:16px}.eyebrow{margin:22px 0 8px;color:var(--green);font-size:12px;font-weight:800;letter-spacing:.19em}.brand-story h1{margin:0;font-family:serif;font-size:64px;line-height:1.12;letter-spacing:-.04em}.brand-copy{max-width:520px;margin:24px 0;color:var(--muted);font-size:18px;line-height:1.9}.feature-row{display:flex;gap:12px;flex-wrap:wrap}.feature-row span{border:1px solid rgba(23,107,76,.2);background:rgba(255,255,255,.55);padding:9px 16px;border-radius:999px;color:var(--green);font-size:14px}.auth-card{background:rgba(255,255,255,.91);border:1px solid rgba(255,255,255,.8);border-radius:30px;padding:36px;box-shadow:var(--shadow);backdrop-filter:blur(16px)}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;background:#eef2ed;padding:5px;border-radius:14px;margin-bottom:28px}.auth-tab{border:0;background:transparent;padding:12px;border-radius:10px;color:var(--muted);min-height:46px}.auth-tab.active{background:#fff;color:var(--ink);box-shadow:0 4px 14px rgba(20,50,38,.08);font-weight:700}.auth-form{display:grid;gap:18px}.auth-form label,.form-grid label{display:grid;gap:8px;font-size:14px;font-weight:700;color:#35433e}.auth-form input,input,select,textarea{width:100%;border:1px solid var(--line);background:#fbfcf9;border-radius:12px;padding:13px 14px;color:var(--ink);outline:none;transition:.2s;min-height:46px}.auth-form input:focus,input:focus,select:focus,textarea:focus{border-color:#64a287;box-shadow:0 0 0 4px rgba(23,107,76,.08)}.primary,.secondary,.text-button{border:0;border-radius:12px;padding:12px 17px;font-weight:800;min-height:44px}.primary{background:var(--green);color:#fff;box-shadow:0 8px 20px rgba(23,107,76,.2)}.primary:hover{background:var(--green-dark)}.secondary{background:#eef4ef;color:var(--green);border:1px solid #cfe0d5}.text-button{background:transparent;color:var(--muted);padding:8px}.wide{width:100%}.support-note,.form-message{font-size:13px;color:var(--muted);text-align:center;margin:18px 0 0}.form-message.error{color:#b63e31}.form-message.success{color:var(--green)}
.app-shell{position:relative;z-index:1;min-height:100vh}.topbar{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 28px;background:rgba(255,255,255,.86);backdrop-filter:blur(16px);border-bottom:1px solid rgba(205,219,210,.7);position:sticky;top:0;z-index:10}.brand-inline{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none}.brand-inline strong,.brand-inline small{display:block}.brand-inline small{font-size:11px;color:var(--muted);margin-top:3px}.account-box{display:flex;gap:14px;align-items:center;font-size:14px}.license-badge{background:#edf6f0;color:var(--green);padding:7px 11px;border-radius:999px;font-size:12px;font-weight:700}.workspace{display:grid;grid-template-columns:240px 1fr;min-height:calc(100vh - 72px)}.sidebar{padding:26px 18px;display:flex;flex-direction:column;border-right:1px solid rgba(205,219,210,.7);background:rgba(247,249,244,.72)}.sidebar nav{display:grid;gap:7px}.nav-item{display:flex;gap:12px;align-items:center;border:0;background:transparent;text-align:left;padding:13px 16px;border-radius:12px;color:#596660}.nav-item span{width:20px;font-size:19px}.nav-item.active{background:#fff;color:var(--green);font-weight:800;box-shadow:0 8px 22px rgba(24,74,53,.08)}.sidebar-help{margin-top:auto;background:#e3f0e7;border-radius:18px;padding:18px;color:var(--green-dark)}.sidebar-help p{margin:8px 0 0;font-size:12px;line-height:1.6;color:#507161}.content{padding:34px;max-width:1450px;width:100%;margin:auto}.page{display:none}.page.active{display:block}.page-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:22px;margin-bottom:25px}.page-heading .eyebrow{margin:0 0 7px}.page-heading h2{margin:0;font-family:serif;font-size:34px}.page-heading p:not(.eyebrow){color:var(--muted);margin:8px 0 0}.class-picker{display:flex;align-items:center;gap:10px;background:#fff;border-radius:14px;padding:8px 10px 8px 16px;box-shadow:0 8px 24px rgba(26,62,48,.08);font-size:13px;font-weight:700}.class-picker select{min-width:170px;border:0;background:#f2f5f0}.panel{background:rgba(255,255,255,.92);border:1px solid rgba(219,228,220,.85);border-radius:22px;padding:24px;box-shadow:0 14px 38px rgba(32,67,52,.07);margin-bottom:22px}.send-layout{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(280px,.72fr);gap:22px}.panel-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:13px;font-weight:800}.panel-title span:last-child{color:var(--muted);font-size:12px;font-weight:500}.compose-card textarea{resize:vertical;min-height:150px;line-height:1.7;font-size:17px}.quick-lines{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 22px}.quick-lines button{border:1px dashed #bfd3c6;background:#f5faf6;color:#4c695c;border-radius:999px;padding:7px 12px;font-size:12px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.switch-line{display:flex!important;align-items:center;gap:10px;align-self:end;height:48px}.switch-line input{width:20px;height:20px;accent-color:var(--green)}.template-choice{display:grid;grid-template-columns:auto repeat(3,1fr);align-items:center;gap:10px;margin:22px 0}.template-choice>span{font-size:13px;font-weight:800}.template-option{position:relative;border:1px solid var(--line);border-radius:13px;padding:8px;display:flex;align-items:center;gap:8px;font-size:12px;cursor:pointer}.template-option input{position:absolute;opacity:0}.template-option.selected{border-color:var(--green);background:#f1f7f3}.mini-preview{display:block;width:32px;height:24px;border-radius:6px;background:#f3d7cd;border:4px solid #fff;box-shadow:0 0 0 1px #ddd}.mini-preview.blue-board{background:#2f76ff}.mini-preview.focus-dark{background:#14201c}.send-button{width:100%;display:flex;justify-content:center;gap:18px;font-size:16px;padding:15px}.delivery-card{background:linear-gradient(150deg,#173f31,#0c5b3d);color:#fff}.delivery-card .eyebrow{color:#98d7b8;margin-top:0}.delivery-card h3{font-family:serif;font-size:24px;margin:0 0 26px}.big-status{padding:22px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.12);border-radius:17px;margin-bottom:15px}.big-status strong,.big-status span{display:block}.big-status strong{font-size:19px;margin-bottom:7px}.big-status span{font-size:12px;color:#b9d6ca}.delivery-card .secondary{background:#fff;color:var(--green-dark)}.how-it-works{display:grid;grid-template-columns:30px 1fr;margin-top:28px;align-items:center}.how-it-works>span{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:#ecf6f0;color:var(--green);font-weight:900;font-size:12px}.how-it-works p{margin:10px}.how-it-works p b,.how-it-works p small{display:block}.how-it-works p small{color:#a9c9bb;margin-top:3px}.how-it-works i{width:1px;height:22px;background:rgba(255,255,255,.22);margin-left:14px}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;margin-bottom:24px}.data-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:0 10px 24px rgba(30,67,50,.06)}.data-card.active{border:2px solid var(--green);padding:19px}.data-card h3{margin:0 0 6px}.data-card p{color:var(--muted);font-size:13px;line-height:1.6}.data-card footer{display:flex;gap:8px;align-items:center;margin-top:15px}.status-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#b5c0ba;margin-right:6px}.status-dot.online{background:#29a367;box-shadow:0 0 0 4px #e5f5ec}.list{display:grid;gap:0}.list-row{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center;padding:15px 4px;border-bottom:1px solid #edf1ed}.list-row:last-child{border-bottom:0}.list-row strong,.list-row small{display:block}.list-row small{color:var(--muted);margin-top:5px}.list-actions{display:flex;gap:8px;align-items:center}.compact .list-row{padding:10px 4px}.inline-form{display:flex;gap:10px}.inline-form input{flex:1}.inline-form.wrap{flex-wrap:wrap}.inline-form.wrap input:first-child{flex:0 1 210px}.inline-form.wrap input:nth-child(2){min-width:280px}.span-two{grid-column:span 2}.schedule-form{align-items:end}.schedule-form .primary{height:47px}.empty{text-align:center;padding:35px;color:var(--muted)}.toast{position:fixed;top:85px;right:28px;z-index:30;background:#183c30;color:#fff;padding:13px 18px;border-radius:12px;box-shadow:var(--shadow);max-width:380px}.toast.error{background:#973c32}dialog{border:0;padding:0;border-radius:24px;box-shadow:var(--shadow);width:min(520px,calc(100% - 30px))}dialog::backdrop{background:rgba(9,27,20,.46);backdrop-filter:blur(3px)}.dialog-card{padding:28px;position:relative}.dialog-close{position:absolute;right:14px;top:12px;border:0;background:#eef2ed;width:32px;height:32px;border-radius:50%;font-size:20px}.code-display{font-size:26px;letter-spacing:.09em;text-align:center;padding:22px;background:#eff7f2;border:1px dashed #78aa91;border-radius:16px;color:var(--green-dark);font-weight:900;margin:20px 0}.dialog-card h3{font-family:serif;font-size:25px;margin:0}.dialog-card p{color:var(--muted);line-height:1.7}.danger{color:#b64034!important}.muted{color:var(--muted)}
.password-warning{margin:-6px 0 0;padding:11px 13px;border-radius:12px;background:#fff6e8;color:#805920;font-size:13px;line-height:1.55}.onboarding-card{max-width:840px;margin:42px auto;padding:42px;background:rgba(255,255,255,.94);border:1px solid #dbe6dd;border-radius:28px;box-shadow:var(--shadow)}.welcome-badge{display:inline-block;padding:7px 12px;border-radius:999px;background:#e3f2e8;color:var(--green);font-size:13px;font-weight:800}.onboarding-card>h2{margin:17px 0 8px;font-family:serif;font-size:36px}.onboarding-card>p{margin:0 0 28px;color:var(--muted);font-size:16px}.setup-steps{display:grid;gap:14px}.setup-step{display:grid;grid-template-columns:48px 1fr auto;gap:18px;align-items:center;padding:22px;border:1px solid #d8e4da;border-radius:18px;background:#fbfcfa}.setup-step h3,.setup-step p{margin:0}.setup-step h3{font-size:19px}.setup-step p{margin-top:6px;color:var(--muted);font-size:14px}.step-circle{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:var(--green);color:#fff;font-weight:900}.setup-step.muted-step{opacity:.58}.setup-step.done{background:#edf7f1;border-color:#c5dfce}.setup-step.done .step-circle{background:#d2eadb;color:var(--green)}.setup-step.done .step-circle::after{content:"✓"}.setup-step.done .step-circle{font-size:0}.setup-step.done .step-circle::after{font-size:19px}.step-actions{display:grid;gap:5px;justify-items:stretch}.advanced-options{margin:4px 0 22px;border:1px solid var(--line);border-radius:14px;background:#fafcf9}.advanced-options summary{padding:13px 15px;cursor:pointer;color:#54645d;font-size:14px;font-weight:700}.advanced-options[open] summary{border-bottom:1px solid var(--line)}.advanced-options .form-grid,.advanced-options .template-choice{margin:16px}.delivery-card h3{margin-bottom:18px}.status-help{margin:16px 2px 0;color:#b9d6ca;font-size:13px;line-height:1.6}
@media(max-width:900px){body{background:linear-gradient(180deg,#f5f8f3,#edf4ee)}.auth-shell{display:block;min-height:100svh;padding:22px 16px 36px}.brand-story{display:grid;grid-template-columns:auto 1fr;gap:0 16px;align-items:center;margin:4px auto 18px;max-width:560px}.brand-story .brand-mark{grid-row:1/3;width:68px;height:58px;border-radius:18px;font-size:20px;transform:none}.brand-story .eyebrow{margin:0 0 3px;font-size:10px}.brand-story h1{font-size:30px;line-height:1.15}.brand-story h1 br{display:none}.brand-copy{grid-column:1/3;font-size:14px;line-height:1.65;margin:14px 0 0}.feature-row{display:none}.auth-card{padding:22px 18px;border-radius:22px;max-width:560px;margin:auto}.auth-tabs{margin-bottom:20px}.workspace{display:block}.topbar{height:64px;padding:0 12px}.brand-inline{gap:8px}.brand-inline .brand-mark.small{width:48px;height:38px;font-size:14px;transform:none}.license-badge{padding:6px 8px}.account-box{gap:2px}.account-box #teacherName{display:none}.sidebar{position:fixed;z-index:25;left:0;right:0;bottom:0;padding:7px max(8px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(8px,env(safe-area-inset-left));border:0;border-top:1px solid var(--line);background:rgba(255,255,255,.96);box-shadow:0 -8px 26px rgba(25,56,44,.1);backdrop-filter:blur(16px);overflow:visible}.sidebar nav{display:grid;grid-template-columns:repeat(5,1fr);gap:2px;min-width:0}.sidebar-help{display:none}.nav-item{min-width:0;min-height:52px;padding:5px 2px;gap:2px;display:flex;flex-direction:column;justify-content:center;text-align:center;font-size:11px;border-radius:10px;white-space:nowrap}.nav-item span{width:auto;font-size:18px;line-height:18px}.content{padding:22px 13px calc(92px + env(safe-area-inset-bottom))}.send-layout{grid-template-columns:1fr}.page-heading{align-items:flex-start;flex-direction:column;margin-bottom:18px;gap:14px}.page-heading h2{font-size:27px}.page-heading p:not(.eyebrow){font-size:14px;line-height:1.55}.class-picker{width:100%;padding-left:13px}.class-picker select{flex:1;min-width:0}.panel{padding:18px 15px;border-radius:18px;margin-bottom:15px}.compose-card textarea{min-height:126px;font-size:16px}.quick-lines{flex-wrap:nowrap;overflow-x:auto;margin-bottom:18px;padding-bottom:3px}.quick-lines button{white-space:nowrap;min-height:38px}.template-choice{grid-template-columns:1fr;gap:8px}.template-choice>span{margin-top:6px}.template-option{min-height:54px}.form-grid{grid-template-columns:1fr;gap:13px}.span-two{grid-column:auto}.inline-form{flex-direction:column}.inline-form.wrap input,.inline-form.wrap input:first-child,.inline-form.wrap input:nth-child(2){min-width:0;flex:1}.card-grid{grid-template-columns:1fr}.list-row{grid-template-columns:1fr;gap:10px}.list-actions{justify-content:flex-start;flex-wrap:wrap}.delivery-card{order:2}.how-it-works{display:none}.toast{left:13px;right:13px;top:74px;max-width:none;text-align:center}dialog{max-height:90svh}.dialog-card{padding:24px 18px;max-height:90svh;overflow:auto}.code-display{font-size:20px;overflow-wrap:anywhere}.schedule-form .primary{width:100%}}
@media(max-width:390px){.license-badge{display:none}.brand-inline>span:last-child small{display:none}.nav-item{font-size:10px}.nav-item span{font-size:17px}.page-heading h2{font-size:25px}.auth-card{padding:20px 15px}}
.connection-wait{color:var(--green);font-size:13px;font-weight:700;text-align:center}
.password-field{position:relative;display:block}
.password-field>input{padding-right:74px}
.password-toggle{position:absolute;right:7px;top:50%;transform:translateY(-50%);width:auto;min-width:52px;min-height:34px;padding:8px 12px;border:0;border-radius:9px;background:#eef4ef;color:var(--green);font-size:13px;font-weight:800;line-height:1;cursor:pointer;transition:.2s;-webkit-tap-highlight-color:transparent}
.password-toggle:hover{background:#e2ede6}
.password-toggle:focus-visible{outline:2px solid #64a287;outline-offset:2px}
.password-toggle.is-on{background:#fdeee8;color:#b4523a}
@media(max-width:390px){.password-field>input{padding-right:68px}.password-toggle{font-size:12px;min-width:48px;padding:8px 10px}}
@media(max-width:900px){.onboarding-card{margin:6px auto 20px;padding:25px 18px;border-radius:20px}.onboarding-card>h2{font-size:28px}.onboarding-card>p{font-size:14px;line-height:1.6}.setup-step{grid-template-columns:42px 1fr;padding:17px 14px;gap:12px}.setup-step .primary,.step-actions{grid-column:1/3;width:100%}.setup-step h3{font-size:17px}.setup-step p{line-height:1.55}.advanced-options .form-grid,.advanced-options .template-choice{margin:13px}.password-warning{font-size:12px}}