/* Grammar Lab — all styles (gl- prefix) */

/* ── Page Containers ── */
#grammarLabPage,#grammarTopicPage{
  display:none;min-height:calc(100vh - 58px);background:#F4F4F4;
  font-family:'Open Sans',sans-serif;
}
#grammarLabPage.gl-visible,#grammarTopicPage.gl-visible{display:block;}

/* ── Hero Section ── */
.gl-hero{
  background:linear-gradient(135deg,#0043CE 0%,#0F62FE 60%,#4589FF 100%);
  padding:72px 24px 64px;text-align:center;
}
.gl-hero-inner{max-width:720px;margin:0 auto;}
.gl-hero-badge{
  display:inline-block;background:rgba(255,255,255,0.18);color:#fff;
  font-size:12px;font-weight:700;letter-spacing:0.12em;text-transform:uppercase;
  padding:5px 14px;border-radius:9999px;border:1px solid rgba(255,255,255,0.3);
  margin-bottom:20px;
}
.gl-hero h1{
  color:#fff;font-size:clamp(28px,5vw,48px);font-weight:800;
  line-height:1.15;margin:0 0 16px;letter-spacing:-0.02em;
}
.gl-hero p{
  color:rgba(255,255,255,0.85);font-size:clamp(15px,2.5vw,18px);
  max-width:560px;margin:0 auto 32px;line-height:1.6;
}
.gl-hero-btn{
  display:inline-block;background:#fff;color:#0043CE;
  font-size:15px;font-weight:700;padding:13px 32px;
  border-radius:9999px;border:none;cursor:pointer;
  box-shadow:0 4px 16px rgba(0,0,0,0.18);
  transition:transform 0.18s,box-shadow 0.18s;
}
.gl-hero-btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,0.22);}

/* ── Search Bar ── */
.gl-search-wrap{
  background:#fff;border-bottom:1px solid #E0E0E0;
  padding:18px 24px;
}
.gl-search-inner{max-width:900px;margin:0 auto;position:relative;}
.gl-search-inner svg{
  position:absolute;left:14px;top:50%;transform:translateY(-50%);
  width:18px;height:18px;color:#6F6F6F;pointer-events:none;
}
#glSearchInput{
  width:100%;padding:11px 16px 11px 42px;
  border:1.5px solid #E0E0E0;border-radius:10px;
  font-size:14px;font-family:'Open Sans',sans-serif;
  background:#F4F4F4;color:#161616;outline:none;
  transition:border-color 0.18s,background 0.18s;
  box-sizing:border-box;
}
#glSearchInput:focus{border-color:#0F62FE;background:#fff;}
#glSearchInput::placeholder{color:#9E9E9E;}

/* ── Topic Grid ── */
.gl-grid-section{max-width:1100px;margin:0 auto;padding:48px 24px 64px;}
.gl-grid-section h2{font-size:22px;font-weight:700;color:#161616;margin:0 0 28px;letter-spacing:-0.01em;}
.gl-topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px;}

/* ── Topic Card ── */
.gl-topic-card{
  background:#fff;border-radius:16px;border:1.5px solid #E8E8E8;
  padding:24px;cursor:pointer;
  transition:transform 0.2s,box-shadow 0.2s,border-color 0.2s;
  display:flex;flex-direction:column;gap:10px;
}
.gl-topic-card:hover{transform:translateY(-4px);box-shadow:0 12px 32px -4px rgba(0,0,0,0.12);border-color:#0F62FE;}
.gl-card-icon{width:44px;height:44px;border-radius:12px;background:#EFF4FF;display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0;margin-bottom:4px;}
.gl-card-title{font-size:17px;font-weight:700;color:#161616;margin:0;letter-spacing:-0.01em;}
.gl-card-desc{font-size:13px;color:#6F6F6F;margin:0;line-height:1.55;flex:1;}
.gl-card-meta{display:flex;gap:12px;margin-top:4px;}
.gl-card-meta span{font-size:11px;font-weight:600;color:#0F62FE;background:#EFF4FF;padding:3px 10px;border-radius:9999px;letter-spacing:0.01em;}
.gl-no-results{grid-column:1/-1;text-align:center;padding:60px 24px;color:#6F6F6F;font-size:15px;}

/* ── Breadcrumb ── */
.gl-breadcrumb{display:flex;align-items:center;gap:8px;padding:16px 24px;background:#fff;border-bottom:1px solid #E0E0E0;}
.gl-back-btn{background:none;border:none;cursor:pointer;display:flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:#0F62FE;padding:6px 12px 6px 6px;border-radius:8px;transition:background 0.15s;font-family:'Open Sans',sans-serif;}
.gl-back-btn:hover{background:#EFF4FF;}
.gl-breadcrumb-sep{color:#C0C0C0;font-size:13px;}
.gl-breadcrumb-cur{font-size:13px;color:#6F6F6F;}

/* ── Topic Header ── */
.gl-topic-header{background:#fff;border-bottom:1px solid #E0E0E0;padding:32px 24px 28px;}
.gl-topic-header-inner{max-width:900px;margin:0 auto;display:flex;align-items:flex-start;gap:20px;}
.gl-topic-header-icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:28px;flex-shrink:0;background:#EFF4FF;}
.gl-topic-header-text{flex:1;}
.gl-topic-header-text h1{font-size:clamp(22px,4vw,30px);font-weight:800;color:#161616;margin:0 0 8px;letter-spacing:-0.02em;}
.gl-topic-header-text p{font-size:15px;color:#6F6F6F;margin:0;line-height:1.6;max-width:620px;}

/* ── Tab Switcher ── */
.gl-tabs-bar{background:#fff;border-bottom:1px solid #E0E0E0;padding:0 24px;position:sticky;top:58px;z-index:10;}
.gl-tabs-inner{max-width:900px;margin:0 auto;display:flex;}
.gl-tab{background:none;border:none;cursor:pointer;font-size:14px;font-weight:600;color:#6F6F6F;padding:14px 20px 12px;border-bottom:3px solid transparent;transition:color 0.18s,border-color 0.18s;font-family:'Open Sans',sans-serif;}
.gl-tab:hover{color:#161616;}
.gl-tab.active{color:#0F62FE;border-bottom-color:#0F62FE;}

/* ── Learn & Practice Panels ── */
#glLearnPanel,#glPracticePanel{max-width:900px;margin:0 auto;padding:32px 24px 64px;}

/* ── Section Cards ── */
.gl-section-card{background:#fff;border-radius:14px;border:1.5px solid #E8E8E8;border-left:4px solid #0F62FE;padding:24px 28px;margin-bottom:16px;}
.gl-section-card.type-definition{border-left-color:#0F62FE;}
.gl-section-card.type-explanation{border-left-color:#8A3FFC;}
.gl-section-card.type-rules{border-left-color:#6929C4;}
.gl-section-card.type-examples{border-left-color:#24A148;}
.gl-section-card.type-notes{border-left-color:#F1C21B;}
.gl-section-card.type-summary{border-left-color:#0072C3;background:#F0F8FF;}
.gl-section-title{font-size:16px;font-weight:700;color:#161616;margin:0 0 12px;letter-spacing:-0.01em;}
.gl-section-content{font-size:14px;color:#393939;line-height:1.7;margin:0 0 12px;}
.gl-section-content:last-child{margin-bottom:0;}
.gl-bullets{margin:8px 0 12px;padding-left:0;list-style:none;display:flex;flex-direction:column;gap:6px;}
.gl-bullets li{font-size:14px;color:#393939;line-height:1.6;padding-left:20px;position:relative;}
.gl-bullets li::before{content:'•';color:#0F62FE;font-weight:700;position:absolute;left:6px;}
.gl-examples-list{display:flex;flex-direction:column;gap:8px;margin:10px 0 0;}
.gl-example-item{background:#F8FFFE;border:1px solid #D4EDDA;border-left:3px solid #24A148;border-radius:8px;padding:9px 14px;font-size:13.5px;color:#1A3C2A;line-height:1.55;font-style:italic;}
.gl-section-note{background:#FEFBEC;border:1px solid #F5E69A;border-radius:8px;padding:10px 14px;font-size:13px;color:#5C4B00;line-height:1.5;margin-top:12px;display:flex;gap:8px;align-items:flex-start;}
.gl-section-note::before{content:'💡';flex-shrink:0;}

/* ── Subtopics Accordion ── */
.gl-subtopics-header{font-size:18px;font-weight:700;color:#161616;margin:32px 0 16px;letter-spacing:-0.01em;}
.gl-accordion{display:flex;flex-direction:column;gap:8px;}
.gl-accordion-item{background:#fff;border-radius:12px;border:1.5px solid #E8E8E8;overflow:hidden;}
.gl-accordion-btn{width:100%;background:none;border:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;padding:16px 20px;text-align:left;font-family:'Open Sans',sans-serif;transition:background 0.15s;}
.gl-accordion-btn:hover{background:#F8F9FA;}
.gl-accordion-btn-left{display:flex;flex-direction:column;gap:3px;}
.gl-accordion-title{font-size:15px;font-weight:700;color:#161616;}
.gl-accordion-desc{font-size:12.5px;color:#6F6F6F;}
.gl-accordion-chevron{width:20px;height:20px;color:#6F6F6F;transition:transform 0.2s;flex-shrink:0;}
.gl-accordion-item.open .gl-accordion-chevron{transform:rotate(180deg);}
.gl-accordion-body{display:none;padding:0 20px 20px;border-top:1px solid #F0F0F0;}
.gl-accordion-item.open .gl-accordion-body{display:block;}
.gl-subtopic-examples{margin-top:14px;}
.gl-subtopic-examples-label{font-size:12px;font-weight:700;color:#6F6F6F;text-transform:uppercase;letter-spacing:0.08em;margin-bottom:8px;}
.gl-subtopic-example-chips{display:flex;flex-wrap:wrap;gap:6px;}
.gl-subtopic-example-chip{background:#F4F4F4;border:1px solid #E0E0E0;border-radius:9999px;padding:4px 12px;font-size:12.5px;color:#393939;}

/* ── Practice Panel ── */
.gl-practice-intro{font-size:14px;color:#6F6F6F;margin:0 0 28px;line-height:1.6;}
.gl-exercise-card{background:#fff;border-radius:14px;border:1.5px solid #E8E8E8;padding:24px 28px;margin-bottom:20px;}
.gl-exercise-header{display:flex;align-items:flex-start;gap:12px;margin-bottom:6px;}
.gl-exercise-type-badge{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:0.1em;padding:3px 10px;border-radius:9999px;background:#EFF4FF;color:#0043CE;flex-shrink:0;margin-top:2px;}
.gl-exercise-title{font-size:16px;font-weight:700;color:#161616;margin:0;}
.gl-exercise-instructions{font-size:13.5px;color:#6F6F6F;margin:6px 0 20px;line-height:1.5;}

/* ── Questions ── */
.gl-questions{display:flex;flex-direction:column;gap:20px;}
.gl-question-block{border:1px solid #F0F0F0;border-radius:10px;padding:16px;background:#FAFAFA;}
.gl-q-prompt{font-size:14px;font-weight:600;color:#161616;margin:0 0 12px;line-height:1.55;}
.gl-q-num{font-size:11px;font-weight:700;color:#6F6F6F;text-transform:uppercase;letter-spacing:0.08em;margin-bottom:6px;}

/* MCQ */
.gl-options{display:flex;flex-direction:column;gap:8px;}
.gl-option-btn{background:#fff;border:1.5px solid #E0E0E0;border-radius:8px;padding:10px 14px;text-align:left;cursor:pointer;font-size:13.5px;color:#393939;font-family:'Open Sans',sans-serif;transition:border-color 0.15s,background 0.15s;display:flex;align-items:center;gap:10px;}
.gl-option-btn:hover:not(:disabled){border-color:#0F62FE;background:#F0F6FF;}
.gl-option-btn.selected{border-color:#0F62FE;background:#EFF4FF;color:#0043CE;font-weight:600;}
.gl-option-btn.correct{border-color:#24A148!important;background:#EBFAEE!important;color:#1A4A2A!important;}
.gl-option-btn.wrong{border-color:#DA1E28!important;background:#FFF0F0!important;color:#7A0E14!important;}
.gl-option-btn:disabled{cursor:default;opacity:0.9;}
.gl-option-marker{width:20px;height:20px;border-radius:50%;border:1.5px solid currentColor;display:flex;align-items:center;justify-content:center;font-size:11px;flex-shrink:0;font-weight:700;}

/* True/False */
.gl-tf-btns{display:flex;gap:10px;}
.gl-tf-btn{flex:1;padding:10px;border-radius:8px;border:1.5px solid #E0E0E0;background:#fff;cursor:pointer;font-size:13.5px;font-weight:600;font-family:'Open Sans',sans-serif;transition:border-color 0.15s,background 0.15s;}
.gl-tf-btn:hover:not(:disabled){background:#F4F4F4;}
.gl-tf-btn.selected-true{border-color:#0F62FE;background:#EFF4FF;color:#0043CE;}
.gl-tf-btn.selected-false{border-color:#6929C4;background:#F6EEFF;color:#6929C4;}
.gl-tf-btn.correct{border-color:#24A148!important;background:#EBFAEE!important;color:#1A4A2A!important;}
.gl-tf-btn.wrong{border-color:#DA1E28!important;background:#FFF0F0!important;color:#7A0E14!important;}
.gl-tf-btn:disabled{cursor:default;}

/* Fill Blank */
.gl-fib-sentence{font-size:14px;color:#393939;line-height:1.9;margin-bottom:10px;}
.gl-fib-input{border:2px solid #E0E0E0;border-radius:7px;padding:6px 12px;font-size:14px;font-family:'Open Sans',sans-serif;color:#161616;outline:none;min-width:120px;max-width:200px;transition:border-color 0.15s;display:inline-block;vertical-align:middle;}
.gl-fib-input:focus{border-color:#0F62FE;}
.gl-fib-input.correct{border-color:#24A148;background:#EBFAEE;color:#1A4A2A;}
.gl-fib-input.wrong{border-color:#DA1E28;background:#FFF0F0;color:#7A0E14;}
.gl-fib-input:disabled{cursor:default;}

/* Matching */
.gl-match-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;}
.gl-match-left,.gl-match-right{display:flex;flex-direction:column;gap:6px;}
.gl-match-item-left{background:#EFF4FF;border:1.5px solid #C8DBFF;border-radius:8px;padding:9px 14px;font-size:13.5px;font-weight:600;color:#0043CE;display:flex;align-items:center;justify-content:space-between;gap:6px;}
.gl-match-item-left.matched{background:#EBFAEE;border-color:#A3D9B1;color:#1A4A2A;}
.gl-match-item-left.wrong-match{background:#FFF0F0;border-color:#F5BCBC;color:#7A0E14;}
.gl-match-select{border:1.5px solid #E0E0E0;border-radius:6px;padding:5px 8px;font-size:13px;font-family:'Open Sans',sans-serif;background:#fff;color:#161616;outline:none;cursor:pointer;flex:1;min-width:0;}
.gl-match-select:focus{border-color:#0F62FE;}
.gl-match-select:disabled{cursor:default;opacity:0.9;}

/* Correct Sentence */
.gl-cs-options{display:flex;flex-direction:column;gap:8px;}
.gl-cs-option{background:#fff;border:1.5px solid #E0E0E0;border-radius:8px;padding:10px 14px;font-size:13.5px;color:#393939;cursor:pointer;font-family:'Open Sans',sans-serif;transition:border-color 0.15s,background 0.15s;}
.gl-cs-option:hover:not(:disabled){border-color:#0F62FE;background:#F0F6FF;}
.gl-cs-option.selected{border-color:#0F62FE;background:#EFF4FF;color:#0043CE;font-weight:600;}
.gl-cs-option.correct{border-color:#24A148!important;background:#EBFAEE!important;color:#1A4A2A!important;}
.gl-cs-option.wrong{border-color:#DA1E28!important;background:#FFF0F0!important;color:#7A0E14!important;}
.gl-cs-option:disabled{cursor:default;opacity:0.9;}

/* Feedback */
.gl-q-feedback{font-size:13px;line-height:1.55;margin-top:10px;padding:9px 13px;border-radius:8px;display:none;}
.gl-q-feedback.show{display:block;}
.gl-q-feedback.fb-correct{background:#EBFAEE;color:#1A4A2A;border:1px solid #A3D9B1;}
.gl-q-feedback.fb-wrong{background:#FFF0F0;color:#7A0E14;border:1px solid #F5BCBC;}
.gl-q-feedback strong{font-weight:700;}

/* Score */
.gl-score-bar{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:20px;padding-top:20px;border-top:1px solid #F0F0F0;}
.gl-score-chip{display:inline-flex;align-items:center;gap:8px;padding:8px 18px;border-radius:9999px;font-size:14px;font-weight:700;}
.gl-score-chip.great{background:#EBFAEE;color:#1A4A2A;border:1.5px solid #A3D9B1;}
.gl-score-chip.good{background:#EFF4FF;color:#0043CE;border:1.5px solid #C8DBFF;}
.gl-score-chip.try-again{background:#FFF8EC;color:#6B3A00;border:1.5px solid #F5D89A;}

/* Buttons */
.gl-exercise-actions{display:flex;gap:10px;flex-wrap:wrap;}
.gl-check-btn{background:#0F62FE;color:#fff;border:none;padding:10px 22px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;font-family:'Open Sans',sans-serif;transition:background 0.18s,transform 0.15s;}
.gl-check-btn:hover{background:#0043CE;transform:translateY(-1px);}
.gl-check-btn:disabled{background:#C0C0C0;cursor:default;transform:none;}
.gl-reset-btn{background:#fff;color:#393939;border:1.5px solid #E0E0E0;padding:10px 20px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;font-family:'Open Sans',sans-serif;transition:background 0.18s,border-color 0.18s;}
.gl-reset-btn:hover{background:#F4F4F4;border-color:#C0C0C0;}
.gl-gen-btn{background:transparent;color:#0F62FE;border:1.5px solid #0F62FE;padding:10px 20px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;font-family:'Open Sans',sans-serif;transition:all 0.18s;}
.gl-gen-btn:hover{background:#0F62FE;color:#fff;}
.gl-exercise-actions{display:flex;gap:10px;flex-wrap:wrap;}
@media(max-width:480px){.gl-gen-btn,.gl-reset-btn,.gl-check-btn{flex:1 1 auto;text-align:center;}}

/* ── Responsive ── */
@media(max-width:640px){
  .gl-hero{padding:48px 16px 40px;}
  .gl-grid-section{padding:32px 16px 48px;}
  .gl-topic-grid{grid-template-columns:1fr 1fr;gap:12px;}
  .gl-topic-card{padding:16px;}
  .gl-card-icon{width:36px;height:36px;font-size:18px;}
  .gl-card-title{font-size:14px;}
  #glLearnPanel,#glPracticePanel{padding:20px 14px 48px;}
  .gl-section-card{padding:18px 16px;}
  .gl-exercise-card{padding:18px 16px;}
  .gl-topic-header-inner{flex-direction:column;gap:12px;}
  .gl-match-grid{grid-template-columns:1fr;}
}
@media(max-width:400px){
  .gl-topic-grid{grid-template-columns:1fr;}
}