:root{
  --bg:#0D0F14;--surface:#151820;--card:#1C2030;--border:#252A3A;
  --accent:#FF6B35;--accent2:#FFB347;--green:#2ECC71;--red:#E74C3C;
  --blue:#4A9EFF;--purple:#9B59B6;
  --text:#F0F2F8;--muted:#7A8099;--dim:#3A4060;
  --font-display:'Fraunces',serif;--font-body:'DM Sans',sans-serif;
  --r:14px;--shadow:0 8px 32px rgba(0,0,0,.45);
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:var(--font-body);min-height:100vh;overflow-x:hidden}
body::before{content:'';position:fixed;inset:0;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");pointer-events:none;z-index:0;opacity:.4}

/* ── AUTH GATE ── */
.auth-gate{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;background:var(--bg)}
.auth-card{text-align:center;max-width:440px;padding:48px 36px;background:var(--card);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow)}
.auth-icon{font-size:4rem;margin-bottom:16px}
.auth-title{font-family:var(--font-display);font-size:2rem;font-weight:900;margin-bottom:12px}
.auth-title em{color:var(--accent);font-style:italic}
.auth-sub{color:var(--muted);font-size:.95rem;line-height:1.6;margin-bottom:24px}
.auth-note{color:var(--dim);font-size:.75rem;margin-top:16px}
.btn-lg{padding:14px 32px;font-size:1rem}

/* ── AUTH AREA in header ── */
.user-pill{display:flex;align-items:center;gap:8px;padding:6px 14px;border-radius:20px;background:var(--card);border:1px solid var(--border);font-size:.82rem}
.user-pill .avatar{width:24px;height:24px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:700;color:#fff}
.user-pill .name{color:var(--text);max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.logout-btn{background:none;border:none;color:var(--muted);font-size:.75rem;cursor:pointer;padding:4px 8px;border-radius:6px;transition:all .15s;font-family:var(--font-body)}
.logout-btn:hover{color:var(--red);background:rgba(231,76,60,.1)}

/* ── HEADER ── */
header{position:relative;z-index:10;padding:22px 32px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);background:rgba(13,15,20,.9);backdrop-filter:blur(12px)}
.logo{font-family:var(--font-display);font-size:1.5rem;font-weight:900;color:var(--accent);letter-spacing:-.02em}
.logo span{color:var(--text)}
.header-right{display:flex;align-items:center;gap:16px}

/* ── STATS BAR ── */
.stats-bar{position:relative;z-index:10;display:flex;gap:0;border-bottom:1px solid var(--border);background:var(--surface)}
.stat{flex:1;padding:14px 20px;text-align:center;border-right:1px solid var(--border)}
.stat:last-child{border-right:none}
.stat-n{font-family:var(--font-display);font-size:1.7rem;font-weight:900;line-height:1}
.stat-l{font-size:.7rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-top:2px}
.stat-n.g{color:var(--green)}.stat-n.o{color:var(--accent)}.stat-n.b{color:var(--blue)}

/* ── MAIN LAYOUT ── */
.app{display:grid;grid-template-columns:260px 1fr;min-height:calc(100vh - 113px);position:relative;z-index:5}

/* ── SIDEBAR ── */
.sidebar{background:var(--surface);border-right:1px solid var(--border);padding:20px 0;overflow-y:auto}
.sidebar-section{padding:0 16px;margin-bottom:20px}
.sidebar-label{font-size:.68rem;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin-bottom:10px;padding-left:4px}
.mode-btn{display:flex;align-items:center;gap:10px;width:100%;padding:10px 12px;border:none;border-radius:10px;background:transparent;color:var(--text);font-family:var(--font-body);font-size:.88rem;cursor:pointer;transition:all .18s;text-align:left;margin-bottom:4px}
.mode-btn:hover{background:var(--card)}
.mode-btn.active{background:linear-gradient(135deg,rgba(255,107,53,.18),rgba(255,107,53,.08));color:var(--accent);border:1px solid rgba(255,107,53,.25)}
.mode-icon{font-size:1.1rem;width:28px;text-align:center}
.cat-btn{display:flex;align-items:center;justify-content:space-between;width:100%;padding:8px 12px;border:none;border-radius:8px;background:transparent;color:var(--muted);font-family:var(--font-body);font-size:.8rem;cursor:pointer;transition:all .15s;text-align:left;margin-bottom:2px}
.cat-btn:hover{background:var(--card);color:var(--text)}
.cat-btn.active{background:var(--card);color:var(--accent)}
.cat-badge{background:var(--dim);color:var(--muted);padding:2px 7px;border-radius:20px;font-size:.7rem}
.cat-btn.active .cat-badge{background:rgba(255,107,53,.2);color:var(--accent)}
.priority-pills{display:flex;gap:6px;padding:0 16px;margin-bottom:16px}
.ppill{flex:1;padding:7px 4px;border:1px solid var(--border);border-radius:8px;background:transparent;color:var(--muted);font-size:.75rem;cursor:pointer;text-align:center;transition:all .15s;font-family:var(--font-body)}
.ppill:hover{border-color:var(--accent2);color:var(--accent2)}
.ppill.active{background:rgba(255,179,71,.15);border-color:var(--accent2);color:var(--accent2)}

/* ── MAIN CONTENT ── */
main{padding:28px 32px;display:flex;flex-direction:column;gap:24px}
.screen{display:none;flex-direction:column;gap:20px}
.screen.active{display:flex}

/* ── HOME SCREEN ── */
.home-hero{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:32px;position:relative;overflow:hidden}
.home-hero::before{content:'';position:absolute;top:-60px;right:-60px;width:220px;height:220px;background:radial-gradient(circle,rgba(255,107,53,.15),transparent 70%);border-radius:50%}
.hero-title{font-family:var(--font-display);font-size:2.2rem;font-weight:900;line-height:1.1;margin-bottom:10px}
.hero-title em{color:var(--accent);font-style:italic}
.hero-sub{color:var(--muted);font-size:.95rem;max-width:480px;line-height:1.6}
.hero-cta{display:flex;gap:12px;margin-top:20px;flex-wrap:wrap}
.btn{padding:11px 22px;border-radius:10px;border:none;font-family:var(--font-body);font-size:.88rem;font-weight:600;cursor:pointer;transition:all .18s;display:inline-flex;align-items:center;gap:8px}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#ff5520;transform:translateY(-1px);box-shadow:0 4px 16px rgba(255,107,53,.35)}
.btn-secondary{background:var(--card);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{border-color:var(--accent);color:var(--accent)}
.quick-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.quick-card{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:20px;cursor:pointer;transition:all .2s;position:relative;overflow:hidden}
.quick-card::after{content:'';position:absolute;bottom:0;left:0;right:0;height:3px;background:var(--accent-c,var(--accent));opacity:0;transition:opacity .2s}
.quick-card:hover{border-color:var(--dim);transform:translateY(-2px);box-shadow:var(--shadow)}
.quick-card:hover::after{opacity:1}
.qc-icon{font-size:1.8rem;margin-bottom:10px}
.qc-title{font-weight:600;margin-bottom:4px;font-size:.95rem}
.qc-desc{font-size:.78rem;color:var(--muted);line-height:1.5}

/* ── QUIZ ── */
.quiz-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}
.quiz-title{font-family:var(--font-display);font-size:1.4rem;font-weight:600}
.progress-bar-wrap{background:var(--card);border-radius:4px;height:6px;flex:1;min-width:120px;overflow:hidden}
.progress-bar{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:4px;transition:width .4s ease}
.question-card{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:28px 32px;position:relative}
.q-type-badge{display:inline-block;padding:4px 12px;border-radius:20px;font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;margin-bottom:16px;background:rgba(74,158,255,.15);color:var(--blue);border:1px solid rgba(74,158,255,.25)}
.q-text{font-size:1.15rem;line-height:1.7;margin-bottom:6px}
.q-hint{font-size:.8rem;color:var(--muted);margin-bottom:20px;font-style:italic}
.options-grid{display:grid;gap:10px}
.option{padding:13px 18px;background:var(--surface);border:1.5px solid var(--border);border-radius:10px;cursor:pointer;transition:all .15s;font-family:var(--font-body);font-size:.92rem;color:var(--text);text-align:left;display:flex;align-items:center;gap:10px}
.option:hover:not([disabled]){border-color:var(--blue);background:rgba(74,158,255,.08)}
.option.correct{border-color:var(--green);background:rgba(46,204,113,.1);color:var(--green)}
.option.wrong{border-color:var(--red);background:rgba(231,76,60,.08);color:var(--red)}
.opt-letter{width:24px;height:24px;border-radius:6px;background:var(--dim);display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:700;flex-shrink:0;transition:all .15s}
.option.correct .opt-letter{background:var(--green);color:#fff}
.option.wrong .opt-letter{background:var(--red);color:#fff}
.fill-input{width:100%;padding:14px 18px;background:var(--surface);border:1.5px solid var(--border);border-radius:10px;color:var(--text);font-family:var(--font-body);font-size:1rem;outline:none;transition:border .2s}
.fill-input:focus{border-color:var(--blue)}
.fill-input.correct{border-color:var(--green);background:rgba(46,204,113,.08)}
.fill-input.wrong{border-color:var(--red);background:rgba(231,76,60,.06)}
.submit-btn{padding:12px 28px;background:var(--accent);color:#fff;border:none;border-radius:10px;font-family:var(--font-body);font-size:.9rem;font-weight:600;cursor:pointer;transition:all .18s;margin-top:8px}
.submit-btn:hover{background:#ff5520}
.submit-btn:disabled{opacity:.4;cursor:not-allowed}
.feedback-box{margin-top:16px;padding:14px 18px;border-radius:10px;font-size:.88rem;line-height:1.6;display:none}
.feedback-box.show{display:block}
.feedback-box.ok{background:rgba(46,204,113,.1);border:1px solid rgba(46,204,113,.25);color:#a8f5c8}
.feedback-box.bad{background:rgba(231,76,60,.08);border:1px solid rgba(231,76,60,.2);color:#f5a8a8}
.next-btn{margin-top:14px;padding:11px 24px;background:var(--card);border:1.5px solid var(--border);border-radius:10px;color:var(--text);font-family:var(--font-body);font-size:.88rem;font-weight:600;cursor:pointer;transition:all .18s;display:none}
.next-btn.show{display:inline-flex;align-items:center;gap:8px}
.next-btn:hover{border-color:var(--accent);color:var(--accent)}

/* ── MATCH ── */
.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.match-col{display:flex;flex-direction:column;gap:10px}
.match-item{padding:12px 16px;background:var(--surface);border:1.5px solid var(--border);border-radius:10px;cursor:pointer;transition:all .15s;font-size:.9rem;user-select:none}
.match-item:hover{border-color:var(--blue)}
.match-item.selected{border-color:var(--accent);background:rgba(255,107,53,.1);color:var(--accent)}
.match-item.matched{border-color:var(--green);background:rgba(46,204,113,.1);color:var(--green);cursor:default;opacity:.7}
.match-item.wrong-flash{border-color:var(--red);background:rgba(231,76,60,.1);animation:shake .3s}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

/* ── FLASHCARD ── */
.flashcard-wrap{perspective:1000px;width:100%;max-width:560px;margin:0 auto}
.flashcard{width:100%;height:200px;position:relative;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1);cursor:pointer}
.flashcard.flipped{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;border-radius:var(--r);display:flex;flex-direction:column;align-items:center;justify-content:center;backface-visibility:hidden;padding:28px;border:1px solid var(--border)}
.fc-front{background:var(--card)}
.fc-back{background:linear-gradient(135deg,rgba(255,107,53,.12),rgba(255,179,71,.08));transform:rotateY(180deg)}
.fc-word{font-family:var(--font-display);font-size:2rem;font-weight:900;text-align:center;margin-bottom:8px}
.fc-sub{font-size:.8rem;color:var(--muted);text-align:center}
.fc-example{font-size:.82rem;color:var(--muted);text-align:center;margin-top:10px;font-style:italic;line-height:1.5}
.fc-controls{display:flex;justify-content:center;gap:12px;margin-top:16px}
.fc-btn{padding:10px 20px;border-radius:10px;border:1px solid var(--border);background:var(--card);color:var(--text);font-family:var(--font-body);font-size:.85rem;cursor:pointer;transition:all .15s}
.fc-btn.know{border-color:var(--green);color:var(--green)}
.fc-btn.know:hover{background:rgba(46,204,113,.12)}
.fc-btn.skip{border-color:var(--muted)}
.fc-btn.skip:hover{background:var(--surface)}
.fc-counter{text-align:center;font-size:.8rem;color:var(--muted);margin-top:8px}

/* ── LOADING / RESULT ── */
.loading-wrap{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px;gap:16px}
.spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.loading-text{color:var(--muted);font-size:.9rem}
.result-card{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:32px;text-align:center}
.result-score{font-family:var(--font-display);font-size:4rem;font-weight:900;color:var(--accent);line-height:1}
.result-label{color:var(--muted);font-size:.9rem;margin-top:6px;margin-bottom:24px}
.result-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.no-key-banner{background:rgba(255,107,53,.1);border:1px solid rgba(255,107,53,.3);border-radius:10px;padding:14px 18px;font-size:.85rem;color:var(--accent2);display:flex;align-items:center;gap:10px}

/* ── TTS ── */
.speak-btn{display:inline-flex;align-items:center;justify-content:center;gap:5px;padding:5px 12px;border:1px solid var(--border);border-radius:20px;background:transparent;color:var(--muted);font-family:var(--font-body);font-size:.75rem;cursor:pointer;transition:all .18s;white-space:nowrap;flex-shrink:0}
.speak-btn:hover{border-color:var(--blue);color:var(--blue);background:rgba(74,158,255,.08)}
.speak-btn.playing{border-color:var(--accent2);color:var(--accent2);animation:pulse-border 1s ease-in-out infinite}
@keyframes pulse-border{0%,100%{box-shadow:0 0 0 0 rgba(255,179,71,0)}50%{box-shadow:0 0 0 3px rgba(255,179,71,.25)}}
.tts-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:6px}

/* ── SCENARIO DIALOGUE ── */
#scenarioDialogue{max-height:50vh;overflow-y:auto;padding:4px}

/* ── SCROLLBAR ── */
::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--dim);border-radius:3px}

/* ── RESPONSIVE ── */
@media(max-width:768px){
  .app{grid-template-columns:1fr}
  .sidebar{display:none}
  .quick-cards{grid-template-columns:1fr 1fr}
  header{padding:14px 16px}
  main{padding:16px}
  .stats-bar{flex-wrap:wrap}
  .stat{min-width:0;padding:10px 12px}
  .stat-n{font-size:1.2rem}
}