:root{--ink:#0a0b18;--ink-2:#10122a;--ink-3:#171a38;--line:#ffffff17;--line-2:#ffffff29;--text:#f4f5ff;--muted:#a9aed6;--cyan:#2be4ff;--violet:#8b5cf6;--violet-2:#b18cff;--yellow:#ffeb3b;--green:#69f0ae;--danger:#f87171;--font-display:"Bricolage Grotesque", system-ui, sans-serif;--font-body:"Inter", system-ui, sans-serif;--radius:18px;color-scheme:dark}*,:before,:after{box-sizing:border-box}body{background:radial-gradient(900px 440px at 15% 0%, #2be4ff17, transparent 65%), radial-gradient(850px 420px at 85% 5%, #8b5cf61c, transparent 65%), var(--ink);color:var(--text);font:400 16px/1.6 var(--font-body);-webkit-font-smoothing:antialiased;min-height:100vh;margin:0}a{color:inherit}h1,h2,h3{font-family:var(--font-display);letter-spacing:-.02em;margin:0}p{margin:0}.container{width:min(1160px,100% - 40px);margin-inline:auto}.skip-link{background:var(--yellow);color:#111;z-index:100;border-radius:8px;padding:8px 14px;position:absolute;top:8px;left:-999px}.skip-link:focus{left:12px}.muted{color:var(--muted)}.site-header{z-index:40;backdrop-filter:blur(14px);border-bottom:1px solid var(--line);background:#0a0b18d1;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:18px;height:70px;display:flex}.brand{font:700 18px/1.1 var(--font-display);align-items:center;gap:11px;text-decoration:none;display:inline-flex}.brand-sub{color:var(--cyan)}.nav-links{align-items:center;gap:6px;display:flex}.nav-btn{color:var(--muted);border-radius:999px;padding:8px 14px;font-size:14.5px;font-weight:500;text-decoration:none;transition:color .18s,background .18s}.nav-btn:hover,.nav-btn.is-current{color:var(--text);background:#ffffff12}.header-actions{align-items:center;gap:10px;display:flex}.user-pill{background:var(--ink-2);border:1px solid var(--line-2);border-radius:999px;align-items:center;gap:8px;padding:5px 12px 5px 6px;font-size:13.5px;font-weight:600;display:inline-flex}.user-avatar{object-fit:cover;border-radius:50%;width:24px;height:24px}.user-initial{background:var(--cyan);color:#080915;border-radius:50%;justify-content:center;align-items:center;width:24px;height:24px;font-size:12px;font-weight:800;display:inline-flex}.btn{font:700 15px/1 var(--font-body);cursor:pointer;border:1px solid #0000;border-radius:999px;justify-content:center;align-items:center;gap:10px;padding:12px 22px;text-decoration:none;transition:transform .16s,box-shadow .18s,background .18s;display:inline-flex}.btn-sm{padding:8px 14px;font-size:13.5px}.btn-lg{padding:15px 28px;font-size:16px}.btn-primary{color:#080915;background:linear-gradient(104deg, var(--cyan) 0%, #9d8df8 100%);border-color:#ffffff59}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 10px 24px #2be4ff47}.btn-ghost{color:var(--text);border-color:var(--line-2);background:#ffffff0f}.btn-danger-outline{color:#fca5a5;background:#ef44441a;border-color:#f8717159}.btn-danger-outline:hover{background:#ef444433}.btn-danger{color:#fff;background:#dc2626;border-color:#ef4444}.btn-google{color:#0f172a;background:#fff;border:1px solid #e2e8f0;width:100%;box-shadow:0 8px 24px #00000047}.btn-google:hover{background:#f8fafc;transform:translateY(-1px)}.quiz-main{padding:36px 0 80px}.banner{border-radius:12px;margin-bottom:20px;padding:13px 18px;font-size:14.5px;font-weight:500}.banner.error{color:#fecaca;background:#ef444424;border:1px solid #f8717173}.banner.success{color:var(--green);background:#69f0ae1f;border:1px solid #69f0ae66}.auth-card-wrap{justify-content:center;padding:28px 0;display:flex}.login-card{background:var(--ink-2);border:1px solid var(--line-2);border-radius:24px;gap:20px;width:min(540px,100%);padding:38px 34px;display:grid;box-shadow:0 24px 60px #00000073}.login-badge{width:fit-content;color:var(--cyan);background:#2be4ff1a;border:1px solid #2be4ff4d;border-radius:999px;align-items:center;gap:8px;padding:5px 12px;font-size:12.5px;font-weight:600;display:inline-flex}.badge-dot{background:var(--cyan);border-radius:50%;width:7px;height:7px}.login-card h1{font-size:clamp(26px,4vw,34px);line-height:1.15}.login-lead{color:var(--muted);font-size:15.5px}.login-features{border-top:1px solid var(--line);gap:10px;padding-top:18px;display:grid}.login-feat-item{color:var(--muted);align-items:flex-start;gap:10px;font-size:14px;display:flex}.feat-check{color:var(--green);flex-shrink:0;margin-top:2px}.setup-box{background:#ffeb3b12;border:1px solid #ffeb3b52;border-radius:14px;gap:10px;padding:16px 18px;font-size:13.5px;display:grid}.setup-box h3{color:var(--yellow);font-size:15px}.setup-box a{color:var(--cyan);text-decoration:underline}.setup-box code{color:var(--yellow);word-break:break-all;background:#0006;border-radius:5px;padding:2px 6px;font-size:12.5px}.setup-steps{gap:6px;margin:0;padding-left:18px;display:grid}.dashboard-wrap{gap:24px;display:grid}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;display:grid}.stat-card{background:var(--ink-2);border:1px solid var(--line);border-radius:16px;flex-direction:column;gap:4px;padding:18px 20px;display:flex}.stat-label{color:var(--muted);font-size:13px;font-weight:500}.stat-value{font:800 30px/1.1 var(--font-display)}.stat-new .stat-value{color:var(--yellow)}.stat-learning .stat-value{color:var(--cyan)}.stat-mastered .stat-value{color:var(--green)}.view-tabs{border-bottom:1px solid var(--line);flex-wrap:wrap;gap:8px;padding-bottom:12px;display:flex}.view-tab{border:1px solid var(--line);color:var(--muted);font:600 14.5px/1 var(--font-body);cursor:pointer;background:#ffffff0a;border-radius:999px;padding:10px 18px;transition:all .16s}.view-tab:hover{color:var(--text);border-color:var(--line-2)}.view-tab.is-active{border-color:var(--cyan);color:var(--text);background:#2be4ff24}.quiz-controls-bar{background:var(--ink-2);border:1px solid var(--line);border-radius:16px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-bottom:20px;padding:16px;display:grid}.control-group{color:var(--muted);flex-direction:column;gap:6px;font-size:12.5px;font-weight:600;display:flex}.control-group select,.table-toolbar select,.search-input{background:var(--ink-3);color:var(--text);border:1px solid var(--line-2);font:500 14px/1.2 var(--font-body);border-radius:10px;padding:9px 12px}.empty-arena-card,.quiz-arena-card,.quiz-summary-card{background:var(--ink-2);border:1px solid var(--line-2);border-radius:22px;gap:20px;max-width:780px;margin-inline:auto;padding:32px;display:grid;box-shadow:0 20px 50px #00000059}.arena-top-bar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;display:flex}.arena-progress-info,.arena-score-info{align-items:center;gap:8px;display:flex}.arena-step-pill,.arena-lang-pill,.arena-level-pill,.arena-score-pill{border:1px solid var(--line-2);background:#ffffff12;border-radius:999px;padding:4px 11px;font-size:12.5px;font-weight:600}.arena-lang-pill{color:var(--cyan)}.arena-level-pill{color:var(--yellow)}.progress-track{background:#ffffff14;border-radius:999px;height:6px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--cyan), var(--violet-2));height:100%;transition:width .25s}.subtitle-context-stage{border:1px solid var(--line-2);text-align:center;background:#060711;border-radius:16px;gap:8px;padding:22px 24px;display:grid}.context-eyebrow{text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-size:11.5px;font-weight:700}.context-primary-line{color:#fff;font-size:clamp(20px,2.6vw,25px);font-weight:600;line-height:1.4}.context-secondary-line{color:var(--cyan);font-size:16px;font-weight:500}mark.llws-hl-quiz{color:var(--yellow);text-underline-offset:4px;background:0 0;font-weight:800;text-decoration:underline 2px}mark.llws-cloze-blank{color:var(--cyan);border-bottom:2px dashed var(--cyan);background:#2be4ff24;border-radius:6px;padding:2px 10px;font-weight:700}.arena-prompt{text-align:center;font-size:20px}.arena-choices-grid{grid-template-columns:1fr 1fr;gap:12px;display:grid}@media (width<=640px){.arena-choices-grid{grid-template-columns:1fr}}.arena-choice-btn{background:var(--ink-3);border:1px solid var(--line-2);color:var(--text);font:600 15.5px/1.3 var(--font-body);text-align:left;cursor:pointer;border-radius:14px;align-items:center;gap:12px;padding:15px 16px;transition:border-color .15s,background .15s,transform .12s;display:flex}.arena-choice-btn:hover:not(:disabled){border-color:var(--cyan);background:#2be4ff14;transform:translateY(-1px)}.arena-choice-btn.is-correct{border-color:var(--green);color:#fff;background:#69f0ae29}.arena-choice-btn.is-wrong{border-color:var(--danger);background:#f8717129}.choice-key-num{width:26px;height:26px;color:var(--muted);background:#ffffff14;border-radius:7px;flex-shrink:0;justify-content:center;align-items:center;font-size:12.5px;font-weight:700;display:inline-flex}.arena-feedback-box{border-radius:14px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:16px 18px;display:flex}.arena-feedback-box.is-correct{background:#69f0ae1f;border:1px solid #69f0ae66}.arena-feedback-box.is-wrong{background:#f871711f;border:1px solid #f8717166}.feedback-headline{font-size:16px;font-weight:700}.feedback-detail{color:var(--muted);width:100%;font-size:13.5px}.quiz-summary-card{text-align:center;justify-items:center}.summary-badge{color:var(--green);background:#69f0ae24;border-radius:999px;padding:5px 14px;font-size:13px;font-weight:700}.summary-score-ring{background:var(--ink-3);border:1px solid var(--line-2);border-radius:20px;flex-direction:column;align-items:center;gap:4px;padding:18px 32px;display:flex}.summary-score-ring strong{font:800 48px/1 var(--font-display);color:var(--cyan)}.table-toolbar{flex-wrap:wrap;gap:12px;margin-bottom:16px;display:flex}.search-input{flex:260px}.table-container{background:var(--ink-2);border:1px solid var(--line);border-radius:18px;overflow-x:auto}.data-table{border-collapse:collapse;text-align:left;width:100%;font-size:14.5px}.data-table th{text-transform:uppercase;letter-spacing:.04em;color:var(--muted);border-bottom:1px solid var(--line-2);background:#ffffff05;padding:14px 16px;font-size:12.5px}.data-table td{border-bottom:1px solid var(--line);vertical-align:middle;padding:14px 16px}.empty-table-cell{text-align:center;padding:36px 20px!important}.cell-word-wrap{flex-direction:column;gap:5px;display:flex}.word-highlight-text{color:var(--yellow);font-size:16px;font-weight:700}.meaning-cyan-text{color:var(--cyan);font-weight:600}.mini-pill{color:var(--muted);background:#ffffff14;border-radius:6px;margin-right:5px;padding:2px 7px;font-size:11px;font-weight:600;display:inline-block}.cell-example-stack{flex-direction:column;gap:3px;display:flex}.ex-line-primary{color:var(--text);font-size:14px}.ex-line-secondary{color:var(--muted);font-size:12.5px}.cell-datetime-stack{flex-direction:column;gap:2px;display:flex}.cell-datetime-primary{color:var(--text);font-size:14px;font-weight:600;line-height:1.25}.cell-datetime-secondary{color:var(--muted);font-size:12px;line-height:1.25}.mastery-pill,.arena-mastery-badge{border-radius:999px;width:fit-content;padding:3px 10px;font-size:12px;font-weight:700;display:inline-block}.mastery-new{color:var(--yellow);background:#ffeb3b24;border:1px solid #ffeb3b59}.mastery-learning{color:var(--cyan);background:#2be4ff24;border:1px solid #2be4ff59}.mastery-mastered{color:var(--green);background:#69f0ae26;border:1px solid #69f0ae66}.btn-table-delete{color:#fca5a5;font:600 12.5px/1 var(--font-body);cursor:pointer;background:#ef44441a;border:1px solid #f8717159;border-radius:8px;padding:6px 12px}.btn-table-delete:hover{background:#ef444438}dialog{background:var(--ink-2);color:var(--text);border:1px solid var(--line-2);border-radius:20px;width:min(440px,92vw);padding:0;box-shadow:0 24px 60px #0009}dialog::backdrop{backdrop-filter:blur(3px);background-color:#000000a6}.modal-box{gap:14px;padding:26px;display:grid}.modal-actions{justify-content:flex-end;gap:10px;margin-top:6px;display:flex}