/* Alıştırmalar: level tabs (ba-level-tabs), topic list (ba-toc) and search (ba-search) come from base.css.
   This file adds the hub layout and the list of exercise sets. */
#page-exercises .page-hero-inner{width:100%;max-width:none}
.exercise-hub{padding-top:clamp(8px,2vw,24px);min-height:0}
.exercise-breadcrumb{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:0 0 16px;color:var(--ba-muted);font-size:var(--ba-small);font-weight:400}
.exercise-breadcrumb:empty{display:none}
.exercise-breadcrumb button{min-height:44px;border:0;padding:0;background:none;color:var(--ba-ink);font:inherit;font-weight:600;text-decoration:underline;text-underline-offset:4px;cursor:pointer}
.exercise-breadcrumb .sep{opacity:1}
.hub-toolbar{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 20px}
.hub-back,.hub-study{padding:0 18px}

/* Hub: heading, search, tabs, topic list */
.exercise-discovery-toolbar{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,400px);align-items:end;gap:20px 32px;margin-bottom:24px}
.exercise-discovery-toolbar h2{margin:0 0 8px}
.exercise-discovery-toolbar p{margin:0;color:var(--ba-ink)}
.exercise-discovery-search-note{margin:0 0 20px;color:var(--ba-muted);font-size:var(--ba-small);font-weight:400}
.exercise-discovery-heading{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:18px}
.exercise-discovery-heading h3{margin:0 0 4px;font-family:var(--ba-serif);font-weight:400;font-size:clamp(1.75rem,1.3rem + 1.4vw,2.5rem);letter-spacing:-.02em}
.exercise-discovery-heading p{margin:0;color:var(--ba-ink)}
.exercise-discovery-heading>span{flex:none;padding:0;border:0;background:none;font-size:var(--ba-small);font-weight:400;color:var(--ba-muted);font-variant-numeric:tabular-nums}
.exercise-discovery-status{font-size:var(--ba-small);font-weight:600;color:var(--ba-muted)}
#exerciseTopicView{display:none!important}

/* Topic and its exercise sets */
.topic-overview{margin:0 0 clamp(28px,4vw,40px);padding:clamp(24px,4vw,48px);background:var(--ba-field);color:var(--ba-field-ink);border:0;border-radius:var(--ba-radius);box-shadow:none}
#page-exercises .topic-overview h2{margin:0 0 10px;color:var(--ba-field-ink)}
.topic-overview p{margin:0;max-width:60ch;color:var(--ba-field-ink)}
#exerciseSetView .section-head{display:block;margin:0 0 18px}
#exerciseSetView .section-head h2{margin:0 0 8px}
.exercise-set-grid{display:grid;grid-template-columns:1fr;gap:0;padding:clamp(4px,1vw,12px) clamp(20px,4vw,48px);background:var(--ba-paper);border-radius:var(--ba-radius)}
.exercise-set-card{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:12px 32px;padding:22px 0;background:none;border:0;border-bottom:4px dotted var(--ba-paper-2);border-radius:0;box-shadow:none}
.exercise-set-card:last-child{border-bottom:0}
.exercise-set-card h3{margin:8px 0 6px;font-family:var(--ba-serif);font-weight:600;font-size:var(--ba-lead);color:var(--ba-ink)}
.exercise-set-card p{margin:0;max-width:60ch;color:var(--ba-ink);font-size:var(--ba-body)}
.exercise-set-card .btn{margin:0;white-space:nowrap}
.set-meta{display:flex;gap:6px;flex-wrap:wrap}
.set-chip{display:inline-flex;align-items:center;min-height:26px;padding:2px 9px;border:0;border-radius:0;background:var(--ba-paper-2);color:var(--ba-ink);font-size:var(--ba-small);font-weight:500}
.set-chip-dark{background:var(--ba-ink)!important;color:var(--ba-paper)!important}
.exercise-load-error{margin-top:20px;padding:16px 18px;background:var(--ba-wrong-bg);color:var(--ba-wrong);border:0;border-radius:var(--ba-radius-small);font-weight:500}
.exercise-load-error::before{content:"! ";font-weight:700}

@media(max-width:900px){.exercise-discovery-toolbar{grid-template-columns:1fr;align-items:stretch}}
@media(max-width:620px){
  .exercise-discovery-heading{flex-direction:column;align-items:flex-start}
  .exercise-set-card{grid-template-columns:1fr}
  .exercise-set-card .btn{width:100%;white-space:normal}
}

/* Quiz: a help note beside the question sheet. Feedback always says right or wrong in words and a symbol, not only colour. */
#page-exercises .learn-layout{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:12px;align-items:start}
#page-exercises .learn-layout.solo-quiz{grid-template-columns:minmax(0,1fr)}
#page-exercises .learn-layout.solo-quiz .quiz-panel{width:min(860px,100%);margin:0 auto}

/* Help note */
#page-exercises .lesson-panel{position:sticky;top:88px;padding:clamp(20px,3vw,32px);background:var(--ba-paper-2);border:0;border-radius:var(--ba-radius);box-shadow:none}
#page-exercises .topic-status{display:block;padding:0;background:none;color:var(--ba-muted);font-size:var(--ba-small);font-weight:600;border-radius:0}
#page-exercises .lesson-panel-title{margin:10px 0 8px;font-family:var(--ba-serif);font-weight:600;font-size:var(--ba-lead)}
#page-exercises .lesson-panel .sub{color:var(--ba-ink);font-size:var(--ba-body)}
#page-exercises .lesson-rule{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:8px;margin:18px 0}
#page-exercises .lesson-rule>div{padding:12px;background:var(--ba-paper);border:0;border-radius:var(--ba-radius-small);text-align:left}
#page-exercises .lesson-rule strong{display:block;font-family:var(--ba-serif);font-size:var(--ba-lead);font-weight:600;color:var(--ba-ink)}
#page-exercises .lesson-rule span{display:block;font-size:var(--ba-small);font-weight:400;color:var(--ba-ink)}
#page-exercises .lesson-content-block h4{margin:18px 0 8px;font-size:var(--ba-body);color:var(--ba-ink)}
#page-exercises .example-list{display:grid;gap:6px;margin:0}
#page-exercises .example-line{padding:10px 12px;background:var(--ba-paper);border:0;border-left:4px solid var(--ba-accent);border-radius:0 var(--ba-radius-small) var(--ba-radius-small) 0;color:var(--ba-ink)}
#page-exercises .module-note{margin-top:14px;font-size:var(--ba-small);color:var(--ba-ink)}

/* Question sheet */
#page-exercises .quiz-panel{padding:clamp(20px,4vw,40px);background:var(--ba-paper);border:0;border-radius:var(--ba-radius);box-shadow:none}
#page-exercises .quiz-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:12px}
#page-exercises .quiz-counter{padding:0;background:none;border:0;color:var(--ba-ink);font-weight:600;font-variant-numeric:tabular-nums}
#page-exercises .best-score{padding:0;background:none;color:var(--ba-muted);font-size:var(--ba-small);font-weight:500}
#page-exercises .progress-track{height:8px;margin:0 0 24px;background:var(--ba-paper-2);border-radius:0;overflow:hidden}
#page-exercises .progress-bar{height:100%;background:var(--ba-accent);border-radius:0;transition:width .3s var(--ba-ease)}
#page-exercises .quiz-word{display:block;margin:0 0 10px;padding:0;background:none;border:0;border-radius:0;color:var(--ba-muted);font-size:var(--ba-small);font-weight:500}
#page-exercises .quiz-question{margin:0 0 22px;font-family:var(--ba-serif);font-weight:600;font-size:clamp(1.5rem,1.2rem + 1.2vw,2rem);line-height:1.35;letter-spacing:-.01em;color:var(--ba-ink)}
#page-exercises .option-grid{display:grid;gap:8px}
#page-exercises .quiz-option{display:flex;align-items:center;gap:14px;flex-wrap:wrap;width:100%;min-height:56px;padding:10px 14px;border:2px solid var(--ba-line);border-radius:var(--ba-radius-small);background:var(--ba-paper);color:var(--ba-ink);font:500 var(--ba-body) var(--ba-sans);text-align:left;cursor:pointer;box-shadow:none;transform:none;touch-action:manipulation;transition:border-color .15s,background-color .15s}
#page-exercises .quiz-option:hover:not([disabled]){border-color:var(--ba-line-strong);background:var(--ba-paper-2);transform:none}
#page-exercises .option-letter{display:grid;place-items:center;flex:none;width:32px;height:32px;border-radius:4px;background:var(--ba-paper-2);color:var(--ba-ink);font-size:var(--ba-small);font-weight:700}
#page-exercises .quiz-option.selected{border-color:var(--ba-ink);background:var(--ba-paper-2);box-shadow:none}
#page-exercises .quiz-option.selected .option-letter{background:var(--ba-ink);color:var(--ba-paper)}
#page-exercises .quiz-option[disabled]{cursor:default;opacity:1}
#page-exercises .quiz-option.correct{border-color:var(--ba-right);background:var(--ba-right-bg);color:var(--ba-right)}
#page-exercises .quiz-option.correct .option-letter{background:var(--ba-right);color:var(--ba-right-bg)}
#page-exercises .quiz-option.wrong{border-color:var(--ba-wrong);background:var(--ba-wrong-bg);color:var(--ba-wrong)}
#page-exercises .quiz-option.wrong .option-letter{background:var(--ba-wrong);color:var(--ba-wrong-bg)}
#page-exercises .option-state{margin-left:auto;font-size:var(--ba-small);font-weight:700}

/* Written answers */
.written-answer-wrap{display:grid;gap:8px}
.written-answer-wrap label{font-size:var(--ba-small);font-weight:600;color:var(--ba-ink)}
#page-exercises .written-answer-input{width:100%;min-height:56px;padding:12px 14px;font-size:var(--ba-lead);font-weight:500}
textarea.written-answer-input{resize:vertical;min-height:110px;line-height:1.55}
.written-answer-input:disabled{opacity:1;cursor:not-allowed;background:var(--ba-paper-2)}

/* Feedback */
#page-exercises .quiz-feedback{display:none;margin-top:16px;padding:16px 18px;border:0;border-left:6px solid currentColor;border-radius:var(--ba-radius-small);font-weight:400;line-height:1.55}
#page-exercises .quiz-feedback.show{display:block}
#page-exercises .quiz-feedback.good{background:var(--ba-right-bg);color:var(--ba-right)}
#page-exercises .quiz-feedback.bad{background:var(--ba-wrong-bg);color:var(--ba-wrong)}
#page-exercises .quiz-feedback>strong{display:block;margin-bottom:4px;font-size:var(--ba-lead)}
#page-exercises .quiz-feedback :is(p,div){color:var(--ba-ink)}
#page-exercises .correct-answer-line{margin:8px 0;padding:8px 10px;background:var(--ba-paper);border-radius:4px;color:var(--ba-ink)}
#page-exercises .correct-answer-line b{font-family:var(--ba-serif);font-size:var(--ba-lead)}
#page-exercises .wrong-explanation strong{color:var(--ba-wrong)}
#page-exercises .wrong-explanation p{margin:4px 0 0}

/* Actions */
#page-exercises .quiz-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
#prevQuestionBtn{order:-1}
#page-exercises .quiz-actions .btn[disabled]{opacity:.55}

/* Result */
#page-exercises .result-box{text-align:left;padding:0}
#page-exercises .result-box h3{margin:6px 0 18px;font-family:var(--ba-serif);font-size:var(--ba-head);font-weight:400}
#page-exercises .result-score{display:inline-flex;align-items:baseline;width:auto;height:auto;margin:0 0 12px;padding:20px 26px;border-radius:var(--ba-radius-small);background:var(--ba-field);color:var(--ba-field-ink);box-shadow:none}
#page-exercises .result-score strong{font-family:var(--ba-serif);font-size:clamp(2.5rem,2rem + 2vw,3.5rem);font-weight:600;line-height:1}
#page-exercises .result-score span{display:block;margin-top:6px;color:var(--ba-field-ink);font-size:var(--ba-small);font-weight:500}
#page-exercises .result-message{max-width:60ch;margin:0;color:var(--ba-ink)}
#page-exercises .wrong-summary{display:grid;gap:8px;margin-top:20px}
#page-exercises .wrong-summary>strong{font-family:var(--ba-serif);font-size:var(--ba-lead)}
#page-exercises .wrong-summary div{padding:12px 14px;background:var(--ba-paper-2);border:0;border-radius:var(--ba-radius-small);color:var(--ba-ink)}
#page-exercises .wrong-summary small{font-size:var(--ba-small);color:var(--ba-ink)}
#page-exercises .result-notice{margin-top:20px}
#page-exercises .result-actions{justify-content:flex-start}

@media(max-width:1020px){
  #page-exercises .learn-layout{grid-template-columns:1fr}
  #page-exercises .lesson-panel{position:static}
}
@media(max-width:620px){
  #page-exercises .quiz-actions .btn{flex:1 1 100%}
  #page-exercises .option-state{flex-basis:100%;margin-left:46px}
}

/* Signed-in students: "result saved" note under the result (js/account/session.js) */
.academy-theme .result-saved-note{margin:16px 0 0}
.academy-theme .result-saved-note.success{background:var(--ba-right-bg);color:var(--ba-right)}
.academy-theme .result-saved-note.error{background:var(--ba-wrong-bg);color:var(--ba-wrong)}