:root{
  --navy:#173554;--blue:#2f88a2;--turquoise:#0aa7b4;--coral:#f28c00;
  --light:#eaf7f8;--soft:#f5f8fa;--line:#d6e7eb;--green:#1b7f43;
  --amber:#b86b00;--red:#f28c00;--ink:#203038;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:Arial,Helvetica,sans-serif;background:#f7fbfc;margin:0;color:var(--ink);line-height:1.55}
a{color:#1d7189}
.container{max-width:1160px;margin:24px auto;background:white;padding:26px;border-radius:18px;box-shadow:0 10px 30px rgba(20,55,70,.09)}
.brand-header{display:flex;justify-content:center;align-items:center;margin:0 auto 18px;text-align:center}
.brand-header img{width:min(370px,82vw);height:auto;display:block}
.top-nav,.bottom-nav{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:0 0 18px;padding:11px;background:var(--light);border:1px solid var(--line);border-radius:14px}
.bottom-nav{margin:24px 0 0}
.btn,button{display:inline-flex;align-items:center;justify-content:center;gap:7px;background:linear-gradient(135deg,var(--blue),var(--turquoise));color:white!important;text-decoration:none;border:0;border-radius:10px;padding:11px 16px;font-size:15px;font-weight:700;cursor:pointer;box-shadow:0 4px 12px rgba(47,136,162,.16)}
.btn:hover,button:hover{filter:brightness(.96);transform:translateY(-1px)}
.btn.secondary,button.secondary{background:white;color:var(--blue)!important;border:1px solid #a9cbd4;box-shadow:none}
.btn.coral{background:var(--coral)}
.btn.disabled{background:#d6dde0;color:#6f7b80!important;pointer-events:none;box-shadow:none}
.btn.wide{min-width:270px}
h1,h2,h3{color:var(--navy);line-height:1.2}
h1{font-size:clamp(26px,4vw,38px);margin:0 0 12px}
h2{margin-top:0}
.hero{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(310px,.92fr);gap:20px;background:linear-gradient(135deg,var(--turquoise),var(--blue));padding:20px;border-radius:20px;color:white;box-shadow:0 12px 28px rgba(10,167,180,.22)}
.hero h1,.hero h2,.hero p,.hero strong{color:white}
.hero-copy,.video-card{border:1px solid rgba(255,255,255,.42);background:rgba(255,255,255,.11);border-radius:16px;padding:20px}
.video-card{background:rgba(15,42,55,.47)}
.video-frame{position:relative;padding-top:56.25%;border-radius:12px;overflow:hidden;background:#000}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.card,.box,.question,.section{border:1px solid var(--line);border-radius:14px;padding:18px;background:white;margin:16px 0}
.section{border-left:6px solid var(--turquoise)}
.section.coral{border-left-color:var(--coral)}
.note{background:var(--light);border-left:5px solid var(--blue);padding:13px 15px;border-radius:10px;margin:14px 0}
.warning{background:#fff4d8;border-left:5px solid #e29a00;padding:13px 15px;border-radius:10px;margin:14px 0}
.success{background:#e8f7ed;border-left:5px solid var(--green);padding:13px 15px;border-radius:10px;margin:14px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.grammar-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:15px}
.grammar-card{border:1px solid var(--line);border-left:5px solid var(--blue);border-radius:13px;padding:15px;background:#fcfefe}
.grammar-card h3{margin-top:0;color:#1f6f83}
.formula{font-family:Arial,Helvetica,sans-serif;background:var(--light);padding:9px 11px;border-radius:9px;font-weight:700;margin:8px 0}
.example{padding:7px 10px;border-left:3px solid #b8dce3;background:#fbfdfe;margin:6px 0}
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;margin:10px 0}
th,td{border:1px solid #d9e6e9;padding:9px 10px;text-align:left;vertical-align:top}
th{background:var(--light);color:var(--navy)}
.links a{display:block;margin:8px 0;word-break:break-word}
.emptyline{height:28px;border-bottom:1px dashed #aebdc2}
.student-grid{display:grid;grid-template-columns:repeat(2,minmax(220px,1fr));gap:13px 18px}
label{display:block;font-weight:700;color:var(--navy);margin-bottom:5px}
input[type=text],input[type=email],textarea,select{width:100%;padding:11px 12px;border:1px solid #aebfc4;border-radius:9px;font:inherit;background:white}
textarea{min-height:96px;resize:vertical}
input:focus,textarea:focus,select:focus{outline:3px solid rgba(10,167,180,.18);border-color:var(--turquoise)}
.small{font-size:13px;color:#596970}
.muted{color:#66777e}
.exercise-list td:last-child{width:160px}
.audio-panel,.media-reminder{background:#f8fbfc;border:1px solid var(--line);border-left:5px solid var(--blue);padding:14px;border-radius:12px;margin:14px 0}
.audio-panel audio{width:100%;margin-top:8px}
.media-reminder{position:sticky;top:8px;z-index:5;box-shadow:0 5px 16px rgba(20,55,70,.08)}
.page-footer{text-align:center;font-size:12px;color:#697a80;margin:28px auto 0;padding-top:17px;border-top:1px solid #e1ecef}
.course-card{display:flex;flex-direction:column;min-height:235px}
.course-card .actions{margin-top:auto}
.unit-number{display:inline-block;background:var(--light);border:1px solid var(--line);color:var(--blue);border-radius:999px;padding:4px 10px;font-weight:700;font-size:13px}
.active-unit{border:2px solid var(--turquoise);box-shadow:0 8px 20px rgba(10,167,180,.12)}
.destination{background:linear-gradient(180deg,#f8fcfd,#fff)}
.destination .icon{font-size:42px}
.step{display:none}
.step.active{display:block}
.progress-shell{height:12px;background:#e3ecef;border-radius:999px;overflow:hidden;margin:14px 0 6px}
.progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--turquoise),var(--blue));transition:width .2s ease}
.progress-text{text-align:right;font-size:13px;color:#607178;font-weight:700}
.question-counter{display:inline-block;background:var(--light);border-radius:999px;padding:5px 10px;color:var(--blue);font-weight:700;margin-bottom:10px}
.question-nav{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:18px 0 0;padding:12px;background:#f8fbfc;border:1px solid var(--line);border-radius:12px}
.question-nav .spacer{flex:1}
.answer-feedback{margin-top:10px;font-weight:700}
.dnd-wordbank,.dnd-dropzone{min-height:66px;border:2px dashed #9fc6d0;border-radius:12px;padding:10px;background:#f7fbfc;margin:10px 0}
.dnd-dropzone{background:white}
.dnd-word{display:inline-flex!important;width:auto!important;padding:9px 12px!important;background:var(--light)!important;color:var(--navy)!important;border:1px solid #b8dce3!important;border-radius:9px!important;margin:4px!important;cursor:grab!important;box-shadow:none!important;touch-action:manipulation}
.dnd-word.dragging{opacity:.45}
.dnd-help{font-size:13px;color:#5f7076}
.lyric-line{font-size:18px;font-weight:700;padding:12px;background:var(--light);border-radius:10px;margin-bottom:12px}
.inline-input{display:inline-block!important;width:min(260px,100%)!important;margin:0 5px}
.score-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(175px,1fr));gap:12px}
.score-card{border:1px solid var(--line);border-radius:12px;padding:13px;background:#fbfdfe}
.score-card.complete{border-left:5px solid var(--green)}
.score-card.incomplete{border-left:5px solid var(--red)}
.result-table .ok{background:#e7f7ec}.result-table .bad{background:#fff2dc}
iframe.pdf-preview{width:100%;height:720px;border:1px solid #bdcdd2;border-radius:12px;background:white}
.hidden{display:none!important}
@media(max-width:850px){
  .hero{grid-template-columns:1fr}.student-grid{grid-template-columns:1fr}
  .exercise-list,.exercise-list tbody,.exercise-list tr,.exercise-list td,.exercise-list th{display:block}
  .exercise-list thead{display:none}.exercise-list tr{border:1px solid var(--line);border-radius:12px;margin:12px 0;overflow:hidden}
  .exercise-list td{border:0;border-bottom:1px solid #edf3f5}.exercise-list td:last-child{border-bottom:0;width:auto}
  .exercise-list td::before{content:attr(data-label);display:block;font-weight:700;color:var(--blue);margin-bottom:4px}
}
@media(max-width:640px){
  .container{margin:0;padding:15px;border-radius:0}.top-nav,.bottom-nav{align-items:stretch}.top-nav .btn,.bottom-nav .btn,.question-nav button,.btn.wide{width:100%}
  .question-nav .spacer{display:none}.brand-header img{width:min(330px,94vw)}
}
@media print{body{background:white}.container{box-shadow:none;margin:0;max-width:none}.top-nav,.bottom-nav,.question-nav,.btn,button{display:none!important}}

.destination-photo{
  display:block;
  width:100%;
  max-width:100%;
  height:clamp(160px,22vw,240px);
  object-fit:cover;
  object-position:center;
  border-radius:12px;
  margin:0 0 14px;
  border:1px solid var(--line);
}
@media(max-width:640px){
  .destination-photo{
    height:clamp(150px,48vw,210px);
  }
}
.listening-video{
  margin-top:10px;
}
.listening-video .video-frame{
  max-width:760px;
  margin:0 auto;
}