:root{
  --navy:#0b2c4d;--navy-2:#123f67;--blue:#1263a5;--blue-2:#e8f3fb;
  --ink:#17212b;--muted:#61717e;--paper:#fff;--page:#edf2f5;
  --green:#17783b;--green-bg:#dff3e5;--red:#b52c2c;--red-bg:#fde1e1;
  --amber:#8c6500;--amber-bg:#fff3c4;--line:#ced8df;
  --shadow:0 16px 48px rgba(12,38,55,.12)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;min-height:100vh;color:var(--ink);
  font-family:Arial,Helvetica,sans-serif;
  background:linear-gradient(180deg,#eef4f7,#e4ecf1)
}
button,select,input{font:inherit}
.hidden{display:none!important}

.app-header{
  position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:12px;
  min-height:74px;padding:10px max(18px,calc((100vw - 1450px)/2));
  color:#fff;background:rgba(11,44,77,.97);
  box-shadow:0 2px 14px rgba(0,0,0,.17);backdrop-filter:blur(9px)
}
.brand-mark{
  display:grid;place-items:center;width:48px;height:48px;flex:0 0 48px;
  border-radius:13px;background:#fff;color:var(--navy);font-weight:900;letter-spacing:.04em;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.7)
}
.brand-copy{min-width:0;flex:1}
.brand-copy h1{margin:0;font-size:1.2rem}
.brand-copy p{margin:3px 0 0;font-size:.85rem;opacity:.86}
.icon-btn,.primary-btn,.secondary-btn,.ghost-btn,.mini-btn{cursor:pointer}
.icon-btn{
  display:grid;place-items:center;min-width:44px;height:44px;border:1px solid rgba(255,255,255,.35);
  border-radius:11px;color:inherit;background:rgba(255,255,255,.08);font-size:1.35rem
}
.text-icon{color:var(--navy);background:#fff;border-color:#c8d5de}
button:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid rgba(18,99,165,.28);outline-offset:2px}

main{width:min(1450px,calc(100% - 28px));margin:0 auto;padding:24px 0 44px}
.welcome-card{
  width:min(900px,100%);margin:3vh auto;padding:clamp(28px,5vw,54px);
  text-align:center;background:#fff;border:1px solid #d5dfe6;border-radius:24px;box-shadow:var(--shadow)
}
.eyebrow{
  margin-bottom:8px;color:var(--blue);font-size:.78rem;font-weight:900;
  letter-spacing:.09em;text-transform:uppercase
}
.welcome-card h2,.selector-head h2{
  margin:0 0 12px;color:var(--navy);font-size:clamp(1.55rem,3vw,2.2rem)
}
.lead{max-width:720px;margin:0 auto 20px;color:#354754;font-size:1.06rem;line-height:1.55}
.format-summary{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;max-width:820px;margin:0 auto 18px
}
.format-summary span{
  display:flex;flex-direction:column;gap:3px;justify-content:center;min-height:66px;padding:9px 10px;
  background:#f2f6f9;border:1px solid #d8e2e9;border-radius:11px;font-size:.88rem
}
.format-summary b{color:var(--navy);font-size:1.05rem}
.format-summary strong{color:var(--blue)}
.fair-note{
  max-width:780px;margin:0 auto 22px;padding:13px 15px;border:1px solid #bfd4e4;border-radius:12px;
  background:#f3f8fc;line-height:1.45;font-size:.93rem
}
.start-select-label{display:block;margin-bottom:7px;font-weight:800}
.start-select,.compact-select{
  min-height:46px;padding:0 40px 0 12px;border:1px solid #b9c9d4;border-radius:10px;background:#fff
}
.start-select{width:min(650px,100%)}
.primary-btn,.secondary-btn,.ghost-btn,.mini-btn{
  min-height:44px;padding:10px 15px;border-radius:11px;border:1px solid transparent;font-weight:800
}
.primary-btn{color:#fff;background:var(--blue)}
.primary-btn:hover{background:#0d568f}
.secondary-btn{color:var(--navy);background:#fff;border-color:#b8c9d4}
.secondary-btn:hover{background:#f4f8fb}
.ghost-btn{color:#364b59;background:transparent;border-color:#c5d1d9}
.danger{color:#922727;border-color:#dab5b5}
.small{min-height:38px;padding:7px 11px}
.start-btn{
  display:flex;align-items:center;justify-content:center;gap:9px;width:min(650px,100%);
  margin:12px auto 0;font-size:1.03rem
}
.start-note{margin:12px 0 0;color:var(--muted);font-size:.87rem;font-weight:700}

.selector-head{
  display:flex;justify-content:space-between;gap:20px;align-items:center;padding:24px;
  background:#fff;border:1px solid #d4dfe6;border-radius:18px;box-shadow:0 8px 28px rgba(12,38,55,.08)
}
.selector-head p{margin:0;color:var(--muted)}
.overall-progress{
  min-width:140px;padding:12px 14px;text-align:center;border-radius:14px;background:#e9f4fb;color:var(--navy)
}
.overall-progress span{display:block;font-size:1.9rem;font-weight:900;line-height:1}
.overall-progress small{display:block;margin-top:4px}
.selector-tools{
  display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin:16px 0;padding:12px 14px;
  background:rgba(255,255,255,.8);border:1px solid #d9e2e9;border-radius:14px
}
.selector-tools label{font-weight:800}
.task-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(245px,1fr));gap:12px}
.task-card{
  display:grid;grid-template-columns:50px 1fr;gap:11px;align-items:center;min-height:94px;padding:12px;
  text-align:left;color:var(--ink);background:#fff;border:1px solid #d6e0e7;border-radius:14px;
  box-shadow:0 4px 14px rgba(13,46,70,.055);cursor:pointer
}
.task-card:hover{transform:translateY(-1px);box-shadow:0 8px 18px rgba(13,46,70,.09)}
.task-card-number{
  display:grid;place-items:center;width:50px;height:50px;border-radius:12px;background:#edf5fa;color:var(--navy);font-weight:900
}
.task-card-copy strong{display:block;line-height:1.18}
.task-card-score{display:block;margin-top:6px;color:var(--muted);font-size:.82rem}
.task-card.complete{border-color:#92caab;background:#fbfffc}
.task-card.complete .task-card-number{color:#fff;background:var(--green)}
.task-card.started .task-card-number{color:#6d4d00;background:var(--amber-bg)}

.task-toolbar{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:12px}
.task-nav{display:flex;align-items:center;gap:7px}
.exam-paper{
  width:100%;padding:clamp(18px,2.4vw,32px);background:#fff;border:1px solid #c8d2d9;border-radius:7px;box-shadow:var(--shadow)
}
.exam-head{display:grid;grid-template-columns:1fr 2fr 1fr;gap:10px;align-items:start;margin-bottom:13px}
.exam-part{font-weight:900;letter-spacing:.04em}
.exam-title{text-align:center;font-weight:900;letter-spacing:.03em}
.score-box{
  justify-self:end;display:flex;align-items:baseline;gap:4px;min-width:136px;padding:9px 11px;border:1.5px solid #111
}
.score-box strong{font-size:1.18rem}
.score-box span{font-weight:800;font-size:.9rem}
.task-number-row{display:flex;justify-content:space-between;gap:12px;margin-bottom:10px;color:var(--muted);font-size:.86rem;font-weight:700}
.completion-label{color:var(--navy)}
.mobile-jump{display:none;gap:7px;margin:7px 0 12px}
.mini-btn{min-height:38px;padding:7px 10px;color:var(--navy);background:#eef6fb;border-color:#bdd4e2}

.reading-layout{
  display:grid;grid-template-columns:minmax(0,1.15fr) minmax(455px,.85fr);gap:26px;align-items:start
}
.reading-panel{
  min-width:0;padding-right:22px;border-right:1px solid #ccd5da;
  position:sticky;top:94px;max-height:calc(100vh - 118px);overflow:auto;scrollbar-gutter:stable;
  overscroll-behavior:contain
}
.text-kicker{margin-bottom:7px;color:#70818d;font-size:.7rem;font-weight:900;letter-spacing:.1em;text-align:center}
.story-title{margin:0 0 18px;text-align:center;font-size:1.12rem;line-height:1.3}
.reading-text{padding-right:5px;font-size:.94rem;line-height:1.44}
.text-line{
  display:grid;grid-template-columns:31px 31px minmax(0,1fr);gap:5px;align-items:start;min-height:1.44em
}
.line-no{color:#667782;font-size:.78rem;text-align:right;padding-top:.13em;font-variant-numeric:tabular-nums}
.para-no{font-weight:900;text-align:center}
.line-copy{min-width:0;text-align:left}
.text-line.para-start{margin-top:15px}
.text-line.para-start:first-child{margin-top:0}
.vocab-highlight{
  padding:0 1px;border-bottom:1px dotted #6d5a00;background:linear-gradient(transparent 55%,#fff1a8 55%);
  font-weight:700
}

.questions-panel{min-width:0}
.question-block{margin:0 0 26px;padding:0 0 23px;border-bottom:1px solid #d5dde2}
.question-block:last-of-type{border-bottom:0}
.question-title{display:grid;grid-template-columns:auto 1fr auto;gap:8px;align-items:start;margin:0 0 9px;font-weight:900;line-height:1.35}
.qnum{flex:0 0 auto}
.points-chip{margin-left:8px;padding:3px 7px;border:1px solid #c9d4db;background:#f4f6f7;font-size:.78rem;font-weight:800;white-space:nowrap}
.instruction{margin:0 0 13px;line-height:1.4;font-size:.92rem}
.heading-bank{display:grid;gap:5px;margin:10px 0 13px}
.heading-option{
  display:grid;grid-template-columns:28px 1fr;gap:6px;padding:6px 8px;border:1px solid #dbe2e7;border-radius:7px;background:#fbfcfd;font-size:.88rem
}
.heading-option b{color:var(--navy)}
.heading-table{width:100%;border-collapse:collapse;font-size:.9rem}
.heading-table th,.heading-table td{padding:7px 6px;border-bottom:1px solid #e0e5e9;vertical-align:middle}
.heading-table th{text-align:left;color:#495a66;font-size:.8rem}
.heading-table th:first-child,.heading-table td:first-child{width:72px}
.heading-table td:last-child{width:82px;text-align:right}
.match-select{
  width:92px;min-height:38px;border:1px solid #aebdc7;border-radius:7px;background:#fff;font-weight:800;text-align:center
}
.match-select.correct-choice{background:var(--green-bg);border-color:var(--green);color:#0d5d2e}
.match-select.incorrect-choice{background:var(--red-bg);border-color:var(--red);color:#892121}
.example-cell{padding:7px 9px;border-radius:7px;background:#eef1f3;font-weight:900;display:inline-block;min-width:64px;text-align:center}
.answer-cell{font-weight:800;font-size:.78rem}
.answer-ok{color:var(--green)!important}
.answer-bad{color:var(--red)!important}

.short-example,.line-example{
  margin:0 0 14px;padding:9px 10px;border:1px solid #c7d0d6;background:#f3f4f5;border-radius:8px;font-size:.9rem
}
.example-answer{margin-top:5px;padding-left:27px;font-style:italic;font-weight:700}
.short-item,.line-item{margin:0 0 15px}
.short-prompt,.line-prompt{margin-bottom:6px;font-size:.93rem;line-height:1.35}
.short-row,.line-row{display:flex;align-items:center;gap:7px}
.short-input,.line-input{
  flex:1;min-width:0;min-height:40px;padding:7px 9px;border:0;border-bottom:1.8px solid #596770;
  border-radius:6px 6px 2px 2px;background:#fff;outline:none
}
.line-input{max-width:190px;text-align:center;font-weight:800}
.short-input:focus,.line-input:focus{border-color:var(--blue);box-shadow:0 2px 0 rgba(18,99,165,.15)}
.short-input.correct,.line-input.correct{background:var(--green-bg);border-color:var(--green);color:#0b5b2d}
.short-input.incorrect,.line-input.incorrect{background:var(--red-bg);border-color:var(--red);color:#8b2020}
.point-mark{flex:0 0 49px;font-size:.76rem;font-weight:800;color:#6b7881}
.hidden-solution{display:none}

.vocab-item{margin:0 0 15px}
.vocab-word{
  display:inline-block;margin-bottom:5px;padding:4px 7px;background:#e8ebed;border:1px solid #bfc6ca;font-weight:800
}
.vocab-word small{font-weight:600;color:#50616d}
.option-list{display:grid;gap:4px}
.choice-label{
  display:flex;align-items:flex-start;gap:8px;padding:6px 8px;border-radius:8px;border:1px solid transparent;cursor:pointer
}
.choice-label:hover{background:#f5f8fa}
.choice-label.correct-choice{background:var(--green-bg);border-color:#9acbaa;color:#0f5e30}
.choice-label.incorrect-choice{background:var(--red-bg);border-color:#e0a6a6;color:#8c2424}
.choice-label input{margin-top:2px;transform:scale(1.08)}
.example-choice{opacity:.9}

.perfect-banner{
  margin:15px 0 0;padding:14px;text-align:center;color:#0c6033;background:var(--green-bg);
  border:1px solid #9fd2b2;border-radius:12px;font-weight:900
}
.task-bottom-actions{display:flex;justify-content:space-between;gap:12px;margin-top:13px}
.task-bottom-actions button{min-width:180px}

.intro-overlay{
  position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:18px;
  background:rgba(5,20,32,.86);backdrop-filter:blur(8px)
}
.intro-card{
  width:min(360px,94vw);padding:18px;text-align:center;background:#fff;border-radius:20px;
  box-shadow:0 28px 80px rgba(0,0,0,.34)
}
.intro-video-frame{
  width:min(300px,82vw);height:min(300px,82vw);max-width:300px;max-height:300px;margin:0 auto;
  overflow:hidden;border-radius:14px;background:#08a9d0
}
.intro-video-frame video{display:block;width:100%;height:100%;object-fit:cover}
.intro-progress{height:5px;margin:14px 0 8px;overflow:hidden;background:#dde6ec;border-radius:999px}
.intro-progress span{display:block;width:0;height:100%;background:var(--blue);transition:width .08s linear}
.intro-status{margin:7px 0 10px;color:var(--muted);font-size:.88rem}
.toast{
  position:fixed;left:50%;bottom:max(22px,env(safe-area-inset-bottom));z-index:120;transform:translateX(-50%);
  max-width:min(92vw,620px);padding:11px 15px;color:#fff;background:rgba(11,44,77,.96);
  border-radius:999px;box-shadow:0 10px 30px rgba(0,0,0,.2);font-weight:800;text-align:center
}

@media(max-width:1120px){
  .reading-layout{grid-template-columns:1fr}
  .reading-panel{
    position:relative;top:auto;max-height:none;overflow:visible;padding-right:0;padding-bottom:18px;border-right:0;border-bottom:2px solid #b8c6ce
  }
  .mobile-jump{
    display:flex;position:sticky;top:78px;z-index:8;width:max-content;padding:5px;border-radius:10px;
    background:rgba(255,255,255,.95);box-shadow:0 2px 8px rgba(0,0,0,.08)
  }
}
@media(max-width:820px){
  .format-summary{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:700px){
  main{width:min(100% - 12px,1450px);padding-top:11px}
  .app-header{min-height:66px;padding:9px 10px}
  .brand-mark{width:42px;height:42px;flex-basis:42px}
  .brand-copy h1{font-size:1.05rem}.brand-copy p{display:none}
  .welcome-card{padding:24px 16px;border-radius:18px}
  .selector-head{align-items:flex-start;padding:18px}
  .selector-tools{align-items:stretch}
  .selector-tools label{width:100%}
  .task-grid{grid-template-columns:1fr}
  .task-toolbar{align-items:stretch;flex-direction:column}
  .task-nav{width:100%}
  .task-nav .compact-select{flex:1;min-width:0}
  .exam-paper{padding:17px 10px 24px}
  .exam-head{grid-template-columns:1fr 1fr}
  .exam-title{grid-column:1/-1;grid-row:1}
  .exam-part{grid-column:1;grid-row:2}
  .score-box{grid-column:2;grid-row:2;min-width:120px}
  .reading-text{font-size:.92rem;line-height:1.47}
  .text-line{grid-template-columns:25px 27px minmax(0,1fr);gap:3px}
  .line-copy{overflow-wrap:anywhere}
  .questions-panel{min-width:0}
  .question-title{grid-template-columns:auto 1fr}
  .points-chip{grid-column:2;justify-self:start;margin:1px 0 0}
  .heading-table{font-size:.86rem}
  .heading-table th,.heading-table td{padding:7px 3px}
  .match-select{width:74px}
  .short-input,.line-input{font-size:16px}
  .task-bottom-actions{flex-direction:column-reverse}
  .task-bottom-actions button{width:100%}
  .overall-progress{min-width:104px}
  .mobile-jump{top:70px}
}
@media(max-width:470px){
  .format-summary{grid-template-columns:1fr 1fr;gap:6px}
  .format-summary span{font-size:.81rem;min-height:60px;padding:7px}
  .selector-head{flex-direction:column}
  .overall-progress{width:100%;display:flex;justify-content:center;gap:5px;align-items:baseline}
  .overall-progress span,.overall-progress small{display:inline}
  .exam-head{font-size:.9rem}
  .score-box{padding:7px}
  .question-title{font-size:.94rem}
  .instruction{font-size:.86rem}
  .choice-label{padding:6px 5px}
  .heading-option{font-size:.84rem}
  .mobile-jump{width:100%}.mobile-jump .mini-btn{flex:1}
  .short-row,.line-row{align-items:stretch}
  .point-mark{flex-basis:44px}
}
@media print{
  body{background:#fff}.app-header,.task-toolbar,.task-bottom-actions,.mobile-jump,.perfect-banner{display:none!important}
  main{width:100%;padding:0}.exam-paper{box-shadow:none;border:0;padding:8mm}
  .reading-layout{grid-template-columns:1fr}.reading-panel{position:static;max-height:none;overflow:visible;border:0;padding:0}
  .questions-panel{page-break-before:always}
}