:root{
  --paper:#f7f5f0;
  --white:#fffefa;
  --ink:#343733;
  --muted:#72746a;
  --gold:#a28b5d;
  --line:#dfdcd2;
  --wash:#ece9df;
  --serif:Georgia,"Noto Serif TC","PMingLiU",serif;
  --sans:system-ui,-apple-system,"Microsoft JhengHei",sans-serif}

*{
  box-sizing:border-box}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font:15px/1.75 var(--sans)}
a{
  color:inherit;
  text-decoration:none}
button,input,select{
  font:inherit}
button,a,input,select{
  touch-action:manipulation}
button{
  cursor:pointer}
button:disabled{
  cursor:default;
  opacity:.45}
button,a{
  -webkit-tap-highlight-color:transparent}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{
  outline:2px solid var(--gold);
  outline-offset:4px}
button{
  border:0}
h1,h2,h3,p{
  margin:0}
h1,h2,h3{
  font-weight:500}
h1,h2{
  font-family:var(--serif)}
h1{
  font-size:clamp(32px,4vw,52px);
  line-height:1.35;
  letter-spacing:.06em}
h2{
  font-size:27px;
  line-height:1.5}
h3{
  font-size:18px;
  line-height:1.5}
small{
  font-size:12px}
input,select{
  width:100%;
  min-height:46px;
  border:1px solid var(--line);
  background:var(--white);
  color:var(--ink);
  padding:10px 12px;
  border-radius:2px}
label{
  display:block}
input[type=checkbox]{
  width:19px;
  min-height:19px;
  height:19px;
  accent-color:var(--gold);
  flex-shrink:0}
.site-header{
  max-width:1280px;
  margin:auto;
  padding:26px 40px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  border-bottom:1px solid var(--line)}
.brand{
  display:flex;
  align-items:center;
  gap:13px;
  font-size:13px;
  letter-spacing:.14em;
  line-height:1.6}
.brand-mark{
  border:1px solid var(--gold);
  color:var(--gold);
  width:43px;
  height:46px;
  text-align:center;
  line-height:43px;
  font-family:var(--serif);
  font-size:25px}
.brand small{
  display:block;
  letter-spacing:.12em;
  color:var(--muted);
  font-size:10px}
nav{
  display:flex;
  align-items:center;
  gap:26px;
  font-size:13px}
nav a,nav button{
  min-height:44px;
  display:inline-flex;
  align-items:center}
nav a[aria-current=page]{
  color:var(--gold)}
.login-link{
  background:transparent;
  border:1px solid var(--line);
  padding:0 18px;
  color:var(--ink)}
main{
  max-width:1120px;
  margin:auto;
  padding:52px 40px 88px;
  min-height:70vh}
.eyebrow{
  font-size:10px;
  letter-spacing:.2em;
  color:var(--gold);
  display:block;
  margin-bottom:14px}
.muted{
  color:var(--muted)}
.button{
  min-height:46px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:11px 24px;
  background:var(--ink);
  color:var(--white);
  font-size:13px;
  border:1px solid var(--ink);
  gap:18px;
  border-radius:2px}
.button:hover{
  background:#4b4f47}
.button.secondary{
  background:transparent;
  color:var(--ink);
  border-color:var(--line)}
.button.secondary:hover{
  background:var(--wash)}
.text-link{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  color:var(--gold);
  font-size:13px;
  gap:14px;
  background:transparent}
.actions{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px}
.hero{
  display:grid;
  grid-template-columns:1.2fr 1fr;
  gap:70px;
  align-items:center;
  padding:32px 0 70px}
.hero h1{
  margin-bottom:23px}
.hero p{
  max-width:420px;
  color:var(--muted);
  font-size:15px;
  line-height:2}
.hero .actions{
  margin-top:30px}
.hero-art{
  position:relative;
  min-height:350px;
  border:1px solid var(--line);
  padding:32px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  background:var(--white)}
.art-words{
  font-family:var(--serif);
  font-size:30px;
  writing-mode:vertical-rl;
  letter-spacing:.35em;
  line-height:2;
  color:#5b6053}
.art-circle{
  width:175px;
  height:175px;
  border:1px solid #c4b58f;
  border-radius:50%;
  position:relative;
  display:grid;
  place-items:center;
  color:var(--gold);
  font-size:11px;
  letter-spacing:.16em}
.art-circle:before{
  content:"";
  position:absolute;
  width:135px;
  height:135px;
  border:1px solid var(--line);
  border-radius:50%}
.art-caption{
  position:absolute;
  bottom:22px;
  left:32px;
  right:32px;
  display:flex;
  justify-content:space-between;
  color:var(--muted);
  font-size:9px;
  letter-spacing:.14em}
.section-heading,.page-heading{
  display:flex;
  align-items:end;
  justify-content:space-between;
  gap:22px;
  margin-bottom:26px}
.page-heading{
  margin-bottom:34px}
.page-heading p{
  margin-top:12px;
  color:var(--muted)}
.intro-line{
  border-top:1px solid var(--line);
  padding-top:32px}
.home-links{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:22px}
.home-card{
  border:1px solid var(--line);
  padding:28px;
  background:var(--white);
  display:flex;
  flex-direction:column;
  gap:14px}
.home-card .number{
  font-size:11px;
  color:var(--gold);
  letter-spacing:.14em}
.home-card p{
  color:var(--muted);
  font-size:13px}
.home-card a{
  margin-top:auto}
.demo-note{
  font-size:12px;
  color:var(--muted);
  border-left:2px solid var(--gold);
  padding-left:14px;
  margin-top:30px}
.period-list{
  display:grid;
  gap:16px}
.period-card{
  background:var(--white);
  border:1px solid var(--line);
  padding:26px 30px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:24px}
.period-card h2{
  font-size:25px}
.period-card p{
  color:var(--muted);
  font-size:12px;
  margin-top:8px}
.badge{
  display:inline-block;
  padding:3px 10px;
  border:1px solid var(--line);
  color:var(--muted);
  font-size:10px;
  letter-spacing:.06em}
.badge.gold{
  border-color:#c9bb9c;
  color:#89754d}
.period-meta{
  display:flex;
  gap:14px;
  align-items:center;
  margin-bottom:8px}
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  color:var(--muted);
  font-size:12px;
  margin-bottom:25px}
.lesson-list{
  display:grid;
  gap:16px}
.lesson-card{
  border:1px solid var(--line);
  background:var(--white);
  display:grid;
  grid-template-columns:68px 1fr auto;
  align-items:center;
  gap:22px;
  padding:24px 28px}
.lesson-number{
  color:var(--gold);
  font-family:var(--serif);
  font-size:31px;
  border-right:1px solid var(--line)}
.lesson-card p{
  font-size:12px;
  color:var(--muted);
  margin-top:8px}
.lesson-layout{
  display:grid;
  grid-template-columns:1.55fr 1fr;
  gap:24px;
  align-items:start}
.panel{
  padding:26px;
  border:1px solid var(--line);
  background:var(--white)}
.panel h2{
  font-size:22px;
  margin-bottom:18px}
.video-placeholder{
  aspect-ratio:16/9;
  background:var(--wash);
  border:1px solid var(--line);
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  text-align:center;
  gap:14px;
  padding:24px;
  margin-bottom:20px}
.play-symbol{
  width:50px;
  height:50px;
  border:1px solid var(--gold);
  border-radius:50%;
  display:grid;
  place-items:center;
  color:var(--gold);
  font-size:16px}
.video-placeholder span:last-child{
  color:var(--muted);
  font-size:11px}
.resource-stack{
  display:grid;
  gap:24px}
.resource-list{
  display:grid;
  gap:0}
.resource{
  min-height:54px;
  background:transparent;
  border-bottom:1px solid var(--line);
  color:var(--ink);
  text-align:left;
  padding:12px 0;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:14px;
  font-size:13px}
.resource:last-child{
  border-bottom:0}
.resource small{
  color:var(--gold);
  flex-shrink:0}
.tabs{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  border-bottom:1px solid var(--line);
  padding-bottom:14px;
  margin-bottom:26px}
.tabs a{
  min-height:44px;
  padding:10px 20px;
  font-size:13px}
.tabs a[aria-current=page]{
  background:var(--ink);
  color:var(--white)}
.management-list{
  display:grid;
  gap:16px}
.management-list details{
  background:var(--white);
  border:1px solid var(--line)}
summary{
  cursor:pointer;
  padding:20px 24px;
  list-style-position:inside}
summary .summary-meta{
  font-size:12px;
  color:var(--muted);
  margin-left:14px}
.details-body{
  padding:0 24px 24px}
.management-lesson{
  border-top:1px solid var(--line);
  padding:18px 0;
  display:flex;
  align-items:start;
  justify-content:space-between;
  gap:20px}
.management-lesson p{
  font-size:12px;
  color:var(--muted);
  margin-top:7px}
.field{
  margin-bottom:17px;
  font-size:13px}
.field input,.field select{
  margin-top:7px}
.student-list{
  display:grid;
  gap:12px}
.student-card{
  border:1px solid var(--line);
  background:var(--white);
  padding:22px;
  display:flex;
  justify-content:space-between;
  gap:24px;
  align-items:start}
.email{
  font-size:12px;
  color:var(--muted);
  overflow-wrap:anywhere}
.student-card p{
  margin-top:7px;
  font-size:12px}
.authorization-layout{
  display:grid;
  grid-template-columns:1.25fr 1fr;
  gap:24px;
  align-items:start}
.check-row{
  display:flex;
  align-items:center;
  gap:12px;
  border-bottom:1px solid var(--line);
  padding:12px 0;
  min-height:54px}
.batch-actions{
  margin-top:24px}
.admin-list{
  margin-top:26px;
  display:grid;
  gap:12px}
.admin-row{
  padding:18px 0;
  border-top:1px solid var(--line);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px}
.settings-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px}
.settings-grid p{
  font-size:13px;
  color:var(--muted);
  margin-bottom:22px}
.site-footer{
  max-width:1280px;
  border-top:1px solid var(--line);
  margin:auto;
  padding:26px 40px;
  display:flex;
  justify-content:space-between;
  gap:20px;
  font-size:10px;
  color:var(--muted);
  letter-spacing:.06em}
.footer-divider{
  padding:0 10px;
  color:#b6ad98}
.skip-link{
  position:absolute;
  top:-80px;
  left:12px;
  background:var(--ink);
  color:white;
  padding:10px 15px;
  z-index:10}
.skip-link:focus{
  top:10px}
dialog{
  border:1px solid var(--line);
  background:var(--white);
  color:var(--ink);
  width:min(520px,calc(100% - 32px));
  max-height:85dvh;
  overflow:auto;
  padding:28px}
dialog::backdrop{
  background:rgba(40,43,38,.4)}
.dialog-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:10px}
.dialog-header .eyebrow{
  margin:0}
.close{
  width:44px;
  height:44px;
  background:transparent;
  font-size:26px;
  color:var(--muted)}
dialog h2{
  font-size:26px;
  margin-bottom:18px}
dialog p{
  font-size:13px;
  color:var(--muted);
  margin-bottom:20px}
.notice{
  position:fixed;
  bottom:22px;
  left:50%;
  transform:translateX(-50%);
  width:max-content;
  max-width:calc(100% - 32px);
  padding:14px 22px;
  background:var(--ink);
  color:var(--white);
  z-index:20;
  font-size:13px;
  border-radius:2px}
.notice[hidden]{
  display:none}

@media(min-width:1400px){
  .hero{
  gap:90px}
.hero-art{
  min-height:370px}
}

@media(max-width:800px){
  .site-header{
  padding:20px 24px;
  flex-wrap:wrap;
  gap:14px}
nav{
  width:100%;
  justify-content:space-between;
  gap:10px}
main{
  padding:36px 24px 60px}
.hero{
  gap:28px;
  grid-template-columns:1fr 1fr;
  padding-top:14px}
.hero-art{
  min-height:300px;
  padding:24px}
.art-circle{
  width:125px;
  height:125px}
.art-circle:before{
  width:95px;
  height:95px}
.art-words{
  font-size:24px}
.home-links{
  gap:12px}
.home-card{
  padding:20px}
.lesson-layout,.authorization-layout,.settings-grid{
  grid-template-columns:1fr}
.site-footer{
  padding:24px;
  flex-direction:column;
  gap:8px}
}

@media(max-width:580px){
  .site-header{
  padding:18px 20px 12px}
.brand{
  font-size:12px}
.brand-mark{
  width:37px;
  height:41px;
  line-height:38px;
  font-size:23px}
nav{
  font-size:12px;
  gap:6px}
.login-link{
  padding:0 11px}
main{
  padding:30px 20px 52px}
.hero{
  grid-template-columns:1fr;
  gap:34px;
  padding:12px 0 38px}
.hero h1{
  font-size:36px}
.hero p{
  font-size:14px}
.hero-art{
  min-height:230px;
  max-width:420px;
  width:100%}
.art-words{
  font-size:27px}
.art-circle{
  width:140px;
  height:140px}
.art-circle:before{
  width:108px;
  height:108px}
.art-caption{
  left:24px;
  right:24px}
.home-links{
  grid-template-columns:1fr}
.home-card{
  padding:24px;
  gap:10px}
.section-heading,.page-heading{
  align-items:start;
  flex-direction:column;
  gap:16px}
.section-heading h2{
  font-size:24px}
.page-heading h1{
  font-size:31px}
.period-card{
  padding:23px;
  align-items:start;
  flex-direction:column;
  gap:17px}
.period-card h2{
  font-size:25px}
.period-card .button{
  width:100%}
.lesson-card{
  grid-template-columns:44px 1fr;
  padding:22px;
  gap:15px}
.lesson-card .text-link{
  grid-column:2}
.lesson-number{
  font-size:26px}
.panel{
  padding:22px}
.tabs{
  gap:3px}
.tabs a{
  padding:10px 12px;
  font-size:12px}
summary{
  padding:18px}
summary .summary-meta{
  display:block;
  margin-left:22px;
  margin-top:5px}
.details-body{
  padding:0 18px 18px}
.management-lesson,.student-card,.admin-row{
  flex-wrap:wrap;
  gap:12px}
.management-lesson .button{
  padding:9px 18px}
.student-card{
  padding:20px}
.actions .button{
  flex-grow:1}
dialog{
  padding:22px}
.site-footer{
  padding:22px 20px}
.demo-note{
  line-height:1.8}
}

@media(prefers-reduced-motion:no-preference){
  a,button{
  transition:background-color .15s,color .15s}
}

main:focus{
  outline:none}

.account-bar {
  max-width:1040px;
  margin:0 auto;
  padding:14px 0;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  font-size:12px;
  border-bottom:1px solid var(--line);
}
.account-bar > div {
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:12px;
  min-width:0;
}
.account-email, .auth-email {
  overflow-wrap:anywhere;
}
.account-bar .button {
  flex-shrink:0;
  padding:8px 18px;
}
dialog .auth-email {
  color:var(--ink);
  margin-top:16px;
}
dialog .auth-error {
  color:#89513d;
  padding:12px;
  border:1px solid #d8bfb3;
  background:#faf3ed;
}
@media(max-width:1120px) {
  .account-bar { margin:0 40px; }
}
@media(max-width:800px) {
  .account-bar { margin:0 24px; }
}
@media(max-width:580px) {
  .account-bar { margin:0 20px; align-items:flex-start; }
}

/* Candidate teacher management */
.management-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:24px; }
.management-list { display:grid; gap:16px; margin:24px 0; }
.management-list article { min-width:0; overflow-wrap:anywhere; }
.management-list p { white-space:pre-wrap; }
.management-feedback { margin-bottom:24px; }
.management-status { white-space:pre-wrap; overflow-wrap:anywhere; }
.operation-results { padding-left:24px; overflow-wrap:anywhere; }
fieldset { border:0; padding:0; margin:0; min-width:0; }
.field select,.field textarea { font:inherit; width:100%; padding:12px; border:1px solid #dedbd2; background:#fffefa; color:#343832; box-sizing:border-box; }
.field textarea { resize:vertical; }
.member-choice { display:flex; align-items:flex-start; gap:12px; padding:10px 0; overflow-wrap:anywhere; }
.member-choice input { flex:0 0 auto; margin-top:5px; }
@media(max-width:700px) { .management-grid { grid-template-columns:1fr; } .management-list { gap:12px; } }

.content-url, .resource, .resource span, .lesson-card h3, .lesson-layout p { overflow-wrap:anywhere; min-width:0; }
.resource { text-decoration:none; color:inherit; }
.resource small { flex-shrink:0; }
.content-description { white-space:pre-wrap; overflow-wrap:anywhere; }
.management-list .button { margin:4px 0; }
/* Disabled file controls must fit narrow phones and long filenames. */
.file-upload-panel input[type="file"], .file-upload-panel progress { width: 100%; min-width: 0; max-width: 100%; }
.file-upload-panel { overflow-wrap: anywhere; }