:root{
  --bg:#f0f4ff;--bg2:#ffffff;--bg3:#f8faff;--border:#e2e8f0;
  --text:#1e2a4a;--text2:#64748b;--text3:#94a3b8;
  --accent:#e63946;--accent2:#f4a261;--blue:#4361ee;--green:#22c55e;--purple:#7c3aed;
  --radius:14px;--radius-sm:9px;--shadow:0 4px 24px rgba(67,97,238,.1);--shadow-sm:0 2px 8px rgba(0,0,0,.06);--transition:.2s ease;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}

/* Navbar */
.navbar{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:.8rem 1.5rem;background:#fff;border-bottom:1px solid var(--border);box-shadow:0 1px 8px rgba(0,0,0,.06)}
.nav-brand{display:flex;align-items:center;gap:.5rem;font-weight:800;font-size:1.1rem;color:var(--text)}
.brand-icon{font-size:1.3rem}
.brand-accent{color:var(--accent)}
.nav-links{display:flex;align-items:center;gap:1rem}
.nav-link{color:var(--text2);font-size:.875rem;font-weight:500;padding:.35rem .75rem;border-radius:8px;transition:var(--transition)}
.nav-link:hover,.nav-link.active{color:var(--blue);background:rgba(67,97,238,.08);text-decoration:none}
.nav-user{display:flex;align-items:center;gap:.75rem}
.user-name{color:var(--text2);font-size:.85rem;font-weight:500}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text2);border-radius:2px}

/* Mobile menu */
.mobile-menu{display:none;flex-direction:column;background:#fff;border-bottom:1px solid var(--border);padding:1rem 1.5rem;gap:.5rem}
.mobile-menu.open{display:flex}
.mobile-menu a{color:var(--text2);padding:.5rem 0;border-bottom:1px solid var(--border);font-size:.95rem}
.mobile-logout{color:var(--accent)!important}

/* Layout */
.main-content{padding:1.5rem;max-width:1100px;margin:0 auto}
.footer{text-align:center;padding:2rem 1rem;color:var(--text3);font-size:.8rem;border-top:1px solid var(--border);margin-top:3rem}
.footer a{color:var(--text3)}

/* Auth */
.auth-body{background:linear-gradient(135deg,#f0f4ff 0%,#e8eeff 50%,#f0f4ff 100%);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem}
.auth-wrapper{width:100%;max-width:420px;display:flex;flex-direction:column;gap:1.5rem}
.auth-brand{text-align:center}
.auth-logo{font-size:3rem;display:block;margin-bottom:.5rem}
.auth-brand-title{font-size:1.5rem;font-weight:800;color:var(--text)}
.auth-brand-sub{color:var(--text3);font-size:.85rem;margin-top:.25rem}
.auth-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:2rem;box-shadow:var(--shadow)}
.auth-title{font-size:1.4rem;font-weight:700;margin-bottom:.25rem;color:var(--text)}
.auth-subtitle{color:var(--text2);font-size:.875rem;margin-bottom:1.5rem}
.auth-footer-note{text-align:center;color:var(--text3);font-size:.8rem;margin-top:1rem}

/* Forms */
.auth-form,.form-block{display:flex;flex-direction:column;gap:1rem}
.form-group{display:flex;flex-direction:column;gap:.35rem}
.form-label{font-size:.85rem;font-weight:600;color:var(--text)}
.form-input,.form-select,.form-textarea{background:#fff;border:1.5px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:inherit;font-size:.95rem;padding:.7rem 1rem;width:100%;transition:var(--transition)}
.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(67,97,238,.12)}
.form-textarea{min-height:100px;resize:vertical}
.input-wrapper{position:relative}
.input-wrapper .form-input{padding-right:3rem}
.input-toggle{position:absolute;right:.75rem;top:50%;transform:translateY(-50%);background:none;border:none;cursor:pointer;font-size:1rem;color:var(--text3)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.65rem 1.25rem;border-radius:var(--radius-sm);font-family:inherit;font-size:.9rem;font-weight:600;border:none;cursor:pointer;transition:var(--transition);text-decoration:none}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 2px 8px rgba(67,97,238,.3)}
.btn-primary:hover{background:#3451d1;transform:translateY(-1px);text-decoration:none}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover{background:#3451d1;text-decoration:none}
.btn-green{background:var(--green);color:#fff}
.btn-green:hover{background:#16a34a;text-decoration:none}
.btn-ghost{background:transparent;border:1.5px solid var(--border);color:var(--text2)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue);text-decoration:none}
.btn-sm{padding:.4rem .85rem;font-size:.8rem}
.btn-full{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}

/* Alerts */
.alert{display:flex;align-items:center;gap:.75rem;padding:.85rem 1.1rem;border-radius:var(--radius-sm);margin-bottom:1rem;font-size:.875rem;font-weight:500}
.alert-error{background:#fff1f2;border:1.5px solid #fecdd3;color:#e11d48}
.alert-success{background:#f0fdf4;border:1.5px solid #bbf7d0;color:#16a34a}
.alert-info{background:#eff6ff;border:1.5px solid #bfdbfe;color:#2563eb}

/* Cards */
.card{background:#fff;border:1.5px solid var(--border);border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow-sm)}
.card-title{font-size:1rem;font-weight:700;margin-bottom:.75rem;color:var(--text)}
.card-sub{font-size:.82rem;color:var(--text3);margin-bottom:.5rem}

/* Stats */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:1rem;margin-bottom:2rem}
.stat-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--radius);padding:1.25rem;text-align:center;box-shadow:var(--shadow-sm)}
.stat-value{font-size:2rem;font-weight:800;line-height:1}
.stat-label{font-size:.75rem;color:var(--text3);margin-top:.4rem;text-transform:uppercase;letter-spacing:.05em;font-weight:600}
.stat-accent{color:var(--accent)}
.stat-blue{color:var(--blue)}
.stat-green{color:var(--green)}
.stat-gold{color:var(--accent2)}

/* Progress */
.progress-bar{height:6px;background:var(--border);border-radius:3px;overflow:hidden;margin-top:.5rem}
.progress-fill{height:100%;border-radius:3px;background:linear-gradient(90deg,var(--blue),var(--purple));transition:width .6s ease}

/* Lesson cards */
.lessons-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.2rem}
.lesson-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--radius);padding:1.4rem;transition:var(--transition);position:relative;overflow:hidden;box-shadow:var(--shadow-sm)}
.lesson-card:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:var(--shadow)}
.lesson-card.completed{border-color:#bbf7d0}
.lesson-badge{display:inline-block;padding:.2rem .65rem;border-radius:4px;font-size:.72rem;font-weight:700;background:rgba(67,97,238,.08);color:var(--blue);margin-bottom:.75rem}
.lesson-title{font-size:1.05rem;font-weight:700;margin-bottom:.5rem;color:var(--text)}
.lesson-meta{font-size:.8rem;color:var(--text3);margin-bottom:1rem}
.lesson-checks{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1rem}
.check-pill{font-size:.72rem;padding:.2rem .55rem;border-radius:4px;background:var(--bg);color:var(--text3);border:1px solid var(--border);font-weight:500}
.check-pill.done{background:#f0fdf4;color:var(--green);border-color:#bbf7d0}
.completed-stamp{position:absolute;top:.75rem;right:.75rem;font-size:.7rem;background:#f0fdf4;color:var(--green);padding:.2rem .5rem;border-radius:4px;font-weight:700;border:1px solid #bbf7d0}

/* Tabs */
.tabs{display:flex;gap:.25rem;border-bottom:2px solid var(--border);margin-bottom:1.5rem;overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tab-btn{background:none;border:none;color:var(--text3);font-family:inherit;font-size:.875rem;font-weight:600;padding:.7rem 1rem;cursor:pointer;white-space:nowrap;border-bottom:2px solid transparent;transition:var(--transition);margin-bottom:-2px}
.tab-btn:hover{color:var(--text)}
.tab-btn.active{color:var(--blue);border-bottom-color:var(--blue)}
.tab-panel{display:none}
.tab-panel.active{display:block}

/* Grammar sections */
.grammar-section{background:#fff;border:1.5px solid var(--border);border-radius:var(--radius);padding:1.25rem;margin-bottom:1rem;box-shadow:var(--shadow-sm)}
.grammar-section h3{font-size:.95rem;font-weight:700;color:var(--blue);margin-bottom:.75rem}
.grammar-section p,.grammar-section div{font-size:.9rem;line-height:1.75;color:var(--text2)}
.rule-grid{display:grid;grid-template-columns:140px 1fr;gap:.4rem .75rem;align-items:center;background:var(--bg3);border-radius:var(--radius-sm);padding:.75rem;margin:.5rem 0;border:1px solid var(--border)}
.rule-subject{font-size:.8rem;font-weight:700;color:var(--blue)}
.rule-verb{font-size:.85rem;color:var(--text)}
.rule-example{grid-column:1/-1;font-size:.85rem;color:var(--text3);font-style:italic}
.rule-example em{color:var(--green);font-style:normal;font-weight:700}
.spelling-note{font-size:.8rem;background:#fffbeb;border:1px solid #fde68a;border-radius:6px;padding:.5rem .75rem;color:#92400e;margin-top:.5rem}

/* Exercises */
.exercise-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--radius);padding:1.4rem;margin-bottom:1rem;box-shadow:var(--shadow-sm)}
.exercise-type{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text3);font-weight:700;margin-bottom:.5rem}
.exercise-question{font-size:.95rem;color:var(--text);margin-bottom:1rem;line-height:1.7}
.exercise-input{background:#fff;border:1.5px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:inherit;font-size:.95rem;padding:.5rem .9rem;min-width:160px;transition:var(--transition)}
.exercise-input:focus{outline:none;border-color:var(--blue)}
.exercise-input.correct{border-color:var(--green);background:#f0fdf4}
.exercise-input.wrong{border-color:var(--accent);background:#fff1f2}
.mc-options{display:flex;flex-direction:column;gap:.5rem}
.mc-option{display:flex;align-items:center;gap:.75rem;background:var(--bg3);border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:.65rem 1rem;cursor:pointer;transition:var(--transition);color:var(--text);font-size:.9rem}
.mc-option:hover{border-color:var(--blue);background:#eff6ff}
.mc-option.selected{border-color:var(--blue);background:#eff6ff}
.mc-option.correct{border-color:var(--green);background:#f0fdf4}
.mc-option.wrong{border-color:var(--accent);background:#fff1f2}
.exercise-feedback{margin-top:.75rem;padding:.75rem;border-radius:var(--radius-sm);font-size:.85rem;line-height:1.6;display:none;font-weight:500}
.exercise-feedback.show{display:block}
.exercise-feedback.correct-fb{background:#f0fdf4;border:1.5px solid #bbf7d0;color:#16a34a}
.exercise-feedback.wrong-fb{background:#fff1f2;border:1.5px solid #fecdd3;color:#e11d48}
.ai-explanation{margin-top:.75rem;background:#eff6ff;border:1.5px solid #bfdbfe;border-radius:var(--radius-sm);padding:.85rem;font-size:.85rem;color:var(--text);display:none}
.ai-explanation.show{display:block}
.ai-explanation h4{color:var(--blue);font-size:.85rem;margin-bottom:.5rem;font-weight:700}
.exercise-score-bar{background:var(--bg3);border-radius:var(--radius);padding:1rem;margin-bottom:1.2rem;display:flex;align-items:center;justify-content:space-between;border:1.5px solid var(--border)}

/* Word ordering */
.word-bank{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:.75rem}
.word-chip{background:#fff;border:1.5px solid var(--border);border-radius:6px;padding:.3rem .7rem;font-size:.85rem;cursor:pointer;user-select:none;transition:var(--transition);color:var(--text);font-weight:500}
.word-chip:hover{border-color:var(--blue);color:var(--blue);background:#eff6ff}
.word-chip.used{opacity:.3;pointer-events:none}
.ordering-dropzone{min-height:44px;background:#f8fbff;border:2px dashed #bfdbfe;border-radius:var(--radius-sm);padding:.5rem;display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.75rem}
.placed-chip{background:#eff6ff;border:1.5px solid #bfdbfe;border-radius:6px;padding:.3rem .7rem;font-size:.85rem;cursor:pointer;color:var(--blue);font-weight:600}

/* Listen */
.listen-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--radius);padding:1.25rem;margin-bottom:.75rem;display:flex;align-items:flex-start;gap:1rem;box-shadow:var(--shadow-sm)}
.listen-num{width:32px;height:32px;min-width:32px;background:rgba(67,97,238,.1);color:var(--blue);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700}
.listen-text{flex:1}
.listen-sentence{font-size:.95rem;color:var(--text);margin-bottom:.25rem;font-weight:500}
.listen-translation{font-size:.8rem;color:var(--text3);font-style:italic}
.listen-actions{display:flex;gap:.5rem;margin-top:.75rem}
.tts-btn{background:#eff6ff;border:1.5px solid #bfdbfe;color:var(--blue);border-radius:6px;padding:.35rem .8rem;font-size:.8rem;cursor:pointer;font-family:inherit;transition:var(--transition);font-weight:600}
.tts-btn:hover{background:#dbeafe}
.tts-btn.loading{opacity:.6;cursor:wait}

/* Speaking / Recorder */
.question-display{background:linear-gradient(135deg,#eff6ff,#f5f3ff);border:1.5px solid #bfdbfe;border-radius:var(--radius);padding:1.5rem;margin-bottom:1.5rem;text-align:center}
.question-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--blue);font-weight:700;margin-bottom:.5rem}
.question-text{font-size:1.15rem;font-weight:700;color:var(--text);line-height:1.5}
.recorder-ui{display:flex;flex-direction:column;align-items:center;gap:1rem;padding:1.5rem;background:#fff;border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
.record-btn{width:80px;height:80px;border-radius:50%;border:none;cursor:pointer;font-size:1.8rem;display:flex;align-items:center;justify-content:center;transition:all .3s;background:#fff1f2;border:2px solid #fecdd3;color:var(--accent)}
.record-btn.recording{background:var(--accent);color:#fff;animation:pulse 1.5s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(230,57,70,.4)}70%{box-shadow:0 0 0 16px rgba(230,57,70,0)}100%{box-shadow:0 0 0 0 rgba(230,57,70,0)}}
.record-status{font-size:.85rem;color:var(--text3);font-weight:500}
.timer{font-size:1.2rem;font-weight:700;font-variant-numeric:tabular-nums;color:var(--accent);min-height:1.5rem}
.waveform{width:100%;height:48px;display:flex;align-items:center;justify-content:center;gap:3px}
.wave-bar{width:4px;background:var(--blue);border-radius:2px;height:8px;transition:height .15s;opacity:.4}
.transcript-box{width:100%;background:var(--bg3);border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:1rem;font-size:.9rem;color:var(--text);min-height:80px;line-height:1.6}
.transcript-actions{display:flex;gap:.75rem;width:100%}

/* AI Feedback */
.feedback-panel{background:#fff;border:1.5px solid var(--border);border-radius:var(--radius);overflow:hidden;margin-top:1.5rem;box-shadow:var(--shadow-sm)}
.feedback-header{background:linear-gradient(135deg,#eff6ff,#f5f3ff);padding:1.25rem 1.5rem;border-bottom:1.5px solid var(--border)}
.feedback-header h3{font-size:1rem;font-weight:700;color:var(--text)}
.feedback-score{font-size:2.5rem;font-weight:800;color:var(--blue);line-height:1}
.feedback-score small{font-size:.9rem;color:var(--text3);font-weight:400}
.feedback-body{padding:1.5rem;display:grid;gap:1.25rem}
.pare-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.75rem}
.pare-item{background:var(--bg3);border-radius:var(--radius-sm);padding:1rem;border-left:3px solid var(--blue);border:1.5px solid var(--border)}
.pare-letter{font-size:1.4rem;font-weight:800;color:var(--blue);line-height:1}
.pare-label{font-size:.7rem;text-transform:uppercase;color:var(--text3);letter-spacing:.06em;font-weight:600}
.pare-score{font-size:1.1rem;font-weight:700;color:var(--text);margin-top:.25rem}
.pare-comment{font-size:.78rem;color:var(--text2);margin-top:.3rem}
.fb-section{background:var(--bg3);border-radius:var(--radius-sm);padding:1rem;border:1.5px solid var(--border)}
.fb-section-title{font-size:.75rem;text-transform:uppercase;font-weight:700;color:var(--text3);letter-spacing:.07em;margin-bottom:.5rem}
.mistake-item{display:flex;flex-direction:column;gap:.2rem;padding:.5rem 0;border-bottom:1px solid var(--border)}
.mistake-item:last-child{border:none}
.mistake-wrong{font-size:.85rem;color:var(--accent);text-decoration:line-through}
.mistake-correct{font-size:.85rem;color:var(--green);font-weight:700}
.mistake-rule{font-size:.78rem;color:var(--text3)}
.vocab-item{display:flex;gap:.5rem;align-items:flex-start;padding:.4rem 0;border-bottom:1px solid var(--border);font-size:.85rem}
.vocab-item:last-child{border:none}
.vocab-basic{color:var(--text3)}
.vocab-arrow{color:var(--border)}
.vocab-adv{color:var(--blue);font-weight:700}
.connector-pills{display:flex;flex-wrap:wrap;gap:.4rem}
.connector-pill{background:#f5f3ff;color:var(--purple);border:1.5px solid #ddd6fe;border-radius:4px;padding:.2rem .55rem;font-size:.8rem;font-weight:600}
.improved-answer{font-size:.875rem;color:var(--text2);line-height:1.75;white-space:pre-wrap}
.turkish-box{background:#fffbeb;border:1.5px solid #fde68a;border-radius:var(--radius-sm);padding:.85rem;font-size:.85rem;color:#92400e}
.cefr-badge{display:inline-block;padding:.25rem .75rem;border-radius:4px;font-weight:700;font-size:.85rem;color:#fff}
.followup-list{display:flex;flex-direction:column;gap:.5rem}
.followup-q{background:var(--bg3);border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:.65rem 1rem;font-size:.875rem;color:var(--text2);cursor:pointer;transition:var(--transition)}
.followup-q:hover{border-color:var(--blue);color:var(--blue);background:#eff6ff}
.encouragement{background:#f0fdf4;border:1.5px solid #bbf7d0;border-radius:var(--radius-sm);padding:.85rem;font-size:.875rem;color:#16a34a;font-style:italic}
.feedback-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem;padding:3rem;color:var(--text3)}
.spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--blue);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* Admin/Table */
.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;flex-wrap:wrap;gap:.75rem}
.page-title{font-size:1.4rem;font-weight:800;color:var(--text)}
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1.5px solid var(--border);box-shadow:var(--shadow-sm)}
table{width:100%;border-collapse:collapse;background:#fff}
thead{background:var(--bg3)}
th{padding:.75rem 1rem;text-align:left;font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text3);font-weight:700;white-space:nowrap}
td{padding:.85rem 1rem;border-top:1px solid var(--border);font-size:.875rem;color:var(--text2)}
tr:hover td{background:#f8faff}
.badge{display:inline-block;padding:.2rem .6rem;border-radius:4px;font-size:.72rem;font-weight:700}
.badge-green{background:#f0fdf4;color:var(--green);border:1px solid #bbf7d0}
.badge-red{background:#fff1f2;color:var(--accent);border:1px solid #fecdd3}
.badge-blue{background:#eff6ff;color:var(--blue);border:1px solid #bfdbfe}
.badge-gray{background:var(--bg3);color:var(--text3);border:1px solid var(--border)}

/* Dashboard weaknesses */
.weakness-list{display:flex;flex-direction:column;gap:.5rem}
.weakness-item{display:flex;align-items:center;gap:.75rem;background:var(--bg3);border-radius:var(--radius-sm);padding:.6rem .9rem;font-size:.83rem;border:1px solid var(--border)}
.weakness-icon{font-size:1rem}
.weakness-label{flex:1;color:var(--text2);font-weight:500}
.weakness-count{background:#fff1f2;color:var(--accent);font-size:.72rem;font-weight:700;padding:.1rem .45rem;border-radius:4px}

/* Responsive */
@media(max-width:768px){
  .nav-links{display:none}
  .nav-toggle{display:flex}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .pare-grid{grid-template-columns:1fr 1fr}
  .lessons-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .main-content{padding:1rem}
  .feedback-body{padding:1rem}
}
@media(max-width:480px){
  .stats-grid{grid-template-columns:1fr 1fr}
  .pare-grid{grid-column:1fr}
  .auth-card{padding:1.25rem}
}