/* E4E — components.css: grammar cards, vocab, flashcards, quiz, notes, badges, charts. */

/* Grammar */
.grammar-card{border:1px solid var(--line);border-inline-start:5px solid var(--brand-2);border-radius:12px;padding:16px;background:var(--card);margin-bottom:12px}
.grammar-card h3{color:var(--brand);margin-bottom:6px;font-size:1.05rem}
.formula-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin:12px 0}
.formula{background:linear-gradient(180deg,var(--brand-soft),#fff);border:1.5px dashed var(--brand-2);border-radius:12px;padding:12px;text-align:center}
.formula b{display:block;font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--brand);margin-bottom:4px}
.formula code{font-size:.98rem;font-weight:700}
.eg-table{width:100%;border-collapse:collapse;margin:10px 0;font-size:.92rem}
.eg-table th,.eg-table td{border:1px solid var(--line);padding:8px 10px;text-align:start}
.eg-table th{background:var(--bg-soft);font-size:.8rem;text-transform:uppercase;letter-spacing:.04em}
.hl{background:#fef9c3;padding:1px 6px;border-radius:6px;font-weight:700}
.interactive-eg{border:1px solid var(--line);border-radius:10px;margin:8px 0;overflow:hidden}
.interactive-eg button.q{width:100%;background:var(--bg);border:0;padding:11px 14px;text-align:start;font-size:.95rem;color:var(--text);display:flex;justify-content:space-between;gap:8px;min-height:46px}
.interactive-eg .a{display:none;padding:11px 14px;background:var(--ok-soft);font-size:.9rem}
.interactive-eg.open .a{display:block}

/* Notes & mistakes */
.note-card{border-radius:12px;padding:14px 16px;margin-bottom:12px;border:1px solid}
.note-card.important{background:#fffbeb;border-color:#f59e0b;border-inline-start:6px solid var(--warn);color:#451a03}
.note-card.important b.t{color:var(--warn)}
.mistake-card{border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:10px;background:var(--card)}
.mistake-pair{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:8px 0}
.mistake-pair .w{background:var(--bad-soft);border-radius:9px;padding:9px 12px}
.mistake-pair .c{background:var(--ok-soft);border-radius:9px;padding:9px 12px}
.mistake-pair .tag{font-size:.75rem;font-weight:800;text-transform:uppercase}
.why{font-size:.88rem;color:var(--muted)}

/* Vocab */
.vocab-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.vocab-card{border:1px solid var(--line);border-radius:12px;padding:14px;background:var(--card)}
.vocab-card .w{font-size:1.1rem;font-weight:800;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.vocab-card .pron{color:var(--muted);font-size:.86rem}
.vocab-card .pos{font-size:.72rem;font-weight:800;background:var(--brand-soft);color:var(--brand);border-radius:99px;padding:2px 9px}
.vocab-card .mean{margin:6px 0;font-size:.92rem}
.vocab-card .ex{font-size:.86rem;color:var(--muted);font-style:italic}
.vocab-card .row{display:flex;gap:6px;margin-top:10px;flex-wrap:wrap}
.key-star{color:var(--warn);font-weight:800}
.speak{border:1px solid var(--line);background:var(--bg);border-radius:8px;min-width:36px;min-height:36px;font-size:1rem}
.speak:hover{background:var(--brand-soft)}
.diff-dots{font-size:.7rem;letter-spacing:2px;color:var(--warn)}

/* Flashcards */
.flash-wrap{display:flex;flex-direction:column;align-items:center;gap:12px}
.flash-card{width:min(460px,100%);height:260px;perspective:1000px;background:none;border:0;display:block;cursor:pointer}
.flash-inner{position:relative;display:block;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.flash-card.flipped .flash-inner{transform:rotateY(180deg)}
.flash-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:16px;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:24px;text-align:center;box-shadow:var(--shadow-lg);border:1px solid var(--line);background:var(--card)}
.flash-face.back{transform:rotateY(180deg);background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;border:0}
.flash-face .big{font-size:1.7rem;font-weight:800}
.flash-ctrl{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}

/* Quiz */
.quiz-progress{height:10px;background:var(--bg-soft);border-radius:99px;overflow:hidden;margin:10px 0}
.quiz-progress > span{display:block;height:100%;background:linear-gradient(90deg,var(--brand-2),var(--accent));transition:width .3s}
.opt{display:block;width:100%;text-align:start;border:2px solid var(--line);background:var(--card);color:var(--text);border-radius:12px;padding:13px 15px;margin:8px 0;font-size:.97rem;min-height:52px;transition:border-color .15s,background .15s}
.opt:hover:not(:disabled){border-color:var(--brand-2);background:var(--bg)}
.opt .k{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:8px;background:var(--bg-soft);font-weight:800;font-size:.82rem;margin-inline-end:10px}
.opt.correct{border-color:var(--ok);background:var(--ok-soft)}
.opt.correct .k{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.opt.wrong .k{background:var(--bad);color:#fff}
.opt:disabled{cursor:default}
.explain{border-radius:12px;padding:13px 15px;margin-top:10px;font-size:.9rem;display:none}
.explain.show{display:block}
.explain.good{background:var(--ok-soft);border:1px solid var(--ok)}
.explain.bad{background:var(--bad-soft);border:1px solid var(--bad)}
.result-ring{width:130px;height:130px;border-radius:50%;display:grid;place-items:center;font-size:1.4rem;font-weight:800;margin:6px auto;border:10px solid var(--ok)}
.mini-quiz{border:1.5px dashed var(--brand-2);border-radius:12px;padding:16px;margin:14px 0;background:color-mix(in srgb,var(--brand-soft) 40%,var(--card))}

/* Exercises */
.ex-card{border:1px solid var(--line);border-radius:12px;padding:15px;margin-bottom:12px;background:var(--card)}
.ex-words{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.ex-words .chip{border:1.5px solid var(--brand-2);background:var(--card);color:var(--text);border-radius:9px;padding:9px 13px;font-weight:600;min-height:42px}
.ex-words .chip.picked{background:var(--brand-soft)}
.ex-answer{min-height:52px;border:2px dashed var(--line);border-radius:10px;padding:8px;display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.ex-answer .chip{background:var(--brand);color:#fff;border-color:var(--brand);border-radius:9px;padding:7px 12px;border:1.5px solid var(--brand)}
.tf-row{display:flex;gap:10px;margin-top:8px}
.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:8px}
.match-grid .opt{min-height:46px;margin:0}
.match-grid .opt.sel{border-color:var(--warn);background:var(--warn-soft)}

/* Patterns, examples, summary */
.pattern{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin:8px 0;font-size:.95rem}
.pattern code{background:#fef9c3;padding:2px 8px;border-radius:6px;font-weight:700}
.review-card{background:linear-gradient(135deg,#fefce8,#ecfdf5);border:1px solid var(--line);border-radius:14px;padding:18px}
.check-list{list-style:none}
.check-list li{padding:6px 0 6px 30px;position:relative}
.check-list li::before{content:"✓";position:absolute;inset-inline-start:4px;color:var(--ok);font-weight:800}

/* Badges */
.badge-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.badge{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center}
.badge.locked{opacity:.45;filter:grayscale(1)}
.badge .e{font-size:2rem}
.badge b{display:block;font-size:.85rem;margin-top:6px}
.badge small{color:var(--muted)}

/* Notes area, bookmarks */
.note-area{width:100%;min-height:110px;border:1.5px solid var(--line);border-radius:10px;padding:12px;font-family:inherit;font-size:.92rem;background:var(--card);color:var(--text);resize:vertical}
.bookmark-btn.active{background:var(--warn-soft);border-color:var(--warn)}

/* Charts */
.chart{width:100%;height:auto;max-height:230px}
.bar-row{display:grid;grid-template-columns:170px 1fr 52px;gap:10px;align-items:center;margin:7px 0;font-size:.86rem}
.bar-track{height:12px;background:var(--bg-soft);border-radius:99px;overflow:hidden}
.bar-fill{height:100%;border-radius:99px;background:linear-gradient(90deg,var(--brand-2),var(--accent))}
.streak-fire{font-size:1.6rem}

/* Review buckets */
.bucket{border:1px solid var(--line);border-radius:12px;padding:14px;margin-bottom:10px;background:var(--card)}
.bucket h4{margin-bottom:6px}
.vocab-img{width:100%;height:175px;object-fit:contain;border-radius:10px;margin-bottom:10px;background:var(--bg-soft)}
.flash-img{width:128px;height:96px;object-fit:contain;border-radius:10px;margin-bottom:8px}
.thumb{width:64px;height:48px;object-fit:contain;border-radius:8px;margin-inline-end:8px;vertical-align:middle}
/* Landing: book library */
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.book-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;transition:transform .15s ease}
.book-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.book-cover{position:relative;height:400px;background:linear-gradient(135deg,var(--brand),var(--accent));display:grid;place-items:center;overflow:hidden}
.book-cover .book-initials{font-size:2.8rem;font-weight:800;color:#fff;letter-spacing:.05em}
.book-cover img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.book-card .body{padding:16px;display:flex;flex-direction:column;gap:8px;flex:1}
.book-card h3{font-size:1.08rem}
.book-card .lvl{font-size:.8rem;color:var(--muted)}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.step{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center}
.step .e{font-size:1.7rem}
.rank-hero{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.rank-hero .big{font-size:2.4rem}
.ex-hint{font-size:.8rem;color:var(--muted);margin:6px 0}
.ex-words .chip[draggable="true"],.ex-answer .chip[draggable="true"]{cursor:grab}
.ex-answer.drag-over{border-color:var(--brand-2);background:var(--brand-soft)}
.ex-words.drag-over{outline:2px dashed var(--brand-2);border-radius:10px}
.vocab-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.vocab-head h2{margin:0}
.toggle-btn{display:inline-flex;align-items:center;gap:8px;border:1.5px solid var(--line);background:var(--card);color:var(--text);border-radius:999px;padding:5px 12px 5px 6px;font-weight:800;font-size:.85rem;min-height:42px}
.toggle-btn .t-cap{font-weight:800;color:var(--muted)}
.toggle-btn .track{width:46px;height:25px;border-radius:999px;background:var(--bg-soft);border:1px solid var(--line);position:relative;transition:background .2s;flex-shrink:0}
.toggle-btn .knob{position:absolute;top:2px;inset-inline-start:2px;width:19px;height:19px;border-radius:50%;background:var(--muted);transition:inset-inline-start .2s,background .2s}
.toggle-btn[aria-pressed="true"] .track{background:var(--ok)}
.toggle-btn[aria-pressed="true"] .knob{inset-inline-start:23px;background:#fff}
.toggle-btn .t-state{min-width:32px;text-align:start}
[data-theme="dark"] .toggle-btn[aria-pressed="true"] .knob{background:#052e16}
/* Auth: avatar, dropdown, login form, guest banner */
#authArea{display:flex;align-items:center}
.avatar{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-weight:800;font-size:1.05rem;border:0;min-width:42px}
.user-menu{position:relative}
.user-drop{position:absolute;top:50px;inset-inline-end:0;width:250px;background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-lg);padding:14px;display:none;z-index:90}
.user-drop.open{display:block}
.user-drop .u-email{font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-drop .u-sub{font-size:.8rem;color:var(--muted);margin:2px 0 10px}
.auth-form{display:grid;gap:10px;margin:12px 0}
.auth-form label{display:grid;gap:5px;font-size:.88rem;font-weight:600}
.auth-form input{padding:11px 12px;border:1.5px solid var(--line);border-radius:10px;background:var(--card);color:var(--text);font-size:.95rem;font-family:inherit}
.guest-banner{border-inline-start:5px solid var(--brand-2);display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:space-between}

/* AI tutor */
.ai-box{border:1px solid var(--line);border-radius:12px;overflow:hidden}
.ai-msgs{max-height:280px;overflow:auto;padding:14px;display:flex;flex-direction:column;gap:9px;background:var(--bg)}
.msg{max-width:85%;padding:10px 13px;border-radius:12px;font-size:.9rem}
.msg.ai{background:var(--card);border:1px solid var(--line);align-self:flex-start}
.msg.me{background:var(--brand);color:#fff;align-self:flex-end}
.ai-input{display:flex;gap:8px;padding:10px;background:var(--card)}
.ai-input input{flex:1;border:1.5px solid var(--line);border-radius:10px;padding:10px 12px;font-size:.9rem;background:var(--card);color:var(--text)}

/* Story + conversation */
.story-para{margin:0 0 12px;line-height:1.75}
.chat{border:1px solid var(--line);border-radius:12px}
.chat-name{font-size:.72rem;opacity:.75}
.msg .translated{display:block;margin-top:4px}
.msg.me .translated{color:rgba(255,255,255,.88)}
.msg.me .speak{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.45)}

/* Lesson nav */
.lesson-nav{display:flex;gap:10px;flex-wrap:wrap;justify-content:space-between;margin:22px 0}
.mode-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.mode-tabs button{border:1.5px solid var(--line);background:var(--card);color:var(--text);border-radius:99px;padding:8px 15px;font-weight:700;font-size:.85rem;min-height:40px}
.mode-tabs button.active{background:var(--brand);color:#fff;border-color:var(--brand)}
.obj-list{margin:8px 0 0 20px}
.translated{color:var(--muted);font-size:.85rem}