html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td,article,aside,canvas,details,embed,figure,figcaption,footer,header,hgroup,menu,nav,output,ruby,section,summary,time,mark,audio,video{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:before,blockquote:after,q:before,q:after{content:"";content:none}table{border-collapse:collapse;border-spacing:0}:root{--bg: #E8F0EC;--surface: #F2F7F4;--primary: #2D5A5C;--accent: #E8A580;--text: #1F2C2E;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px}body{background:var(--bg);color:var(--text);font-family:system-ui,sans-serif;line-height:1.5}h1{font-family:sans-serif;padding:24px}.error{color:red}.home{position:relative;overflow:hidden;min-height:calc(100vh - 64px);display:flex;align-items:center;justify-content:center;padding:var(--space-lg)}.home-cards{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;pointer-events:none}.float-card{position:absolute;aspect-ratio:3 / 2;padding:16px;border-radius:var(--radius-lg);background:var(--surface);border:1px solid rgba(45,90,92,.14);box-shadow:0 10px 30px #1f2c2e0f;display:flex;flex-direction:column;gap:9px;opacity:.55;transform:rotate(var(--rot));animation:cardDrift var(--dur, 20s) ease-in-out var(--delay, 0s) infinite}.float-card--b{background:var(--bg);border-color:#e8a5804d}.float-line{height:8px;border-radius:999px;background:#2d5a5c29;width:100%}.float-line--title{height:11px;width:65%;background:#2d5a5c4d}.float-line--short{width:40%}.float-card--b .float-line{background:#2d5a5c24}.float-card--b .float-line--title{background:#e8a5808c}@keyframes cardDrift{0%{transform:translateY(0) rotate(var(--rot))}50%{transform:translateY(-22px) rotate(calc(var(--rot) * -.6))}to{transform:translateY(0) rotate(var(--rot))}}.home-inner{position:relative;z-index:1;text-align:center;max-width:640px}.home-eyebrow{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.18em;color:var(--primary);opacity:.7;margin:0 0 var(--space-md)}.home-title{font-size:clamp(2.6rem,9vw,5rem);font-weight:800;line-height:1.02;letter-spacing:-.02em;color:var(--primary);padding:0;margin:0 0 var(--space-md)}.home-lede{font-size:clamp(15px,2.2vw,19px);line-height:1.5;color:var(--text);opacity:.78;max-width:460px;margin:0 auto var(--space-lg)}.home-cta{display:flex;gap:var(--space-md);justify-content:center;flex-wrap:wrap}.home-btn{font-size:15px;font-weight:600;text-decoration:none;padding:14px 30px;border-radius:var(--radius-md);transition:background .15s ease,border-color .15s ease,transform .15s ease}.home-btn--solid{background:var(--primary);color:#fff;border:1px solid var(--primary);box-shadow:0 4px 14px #2d5a5c38}.home-btn--solid:hover{background:#234748;border-color:#234748;transform:translateY(-2px)}.home-btn--ghost{background:#f2f7f4b3;color:var(--primary);border:1px solid rgba(45,90,92,.3)}.home-btn--ghost:hover{border-color:var(--primary);transform:translateY(-2px)}@media(max-width:560px){.float-card{opacity:.35}}@media(prefers-reduced-motion:reduce){.float-card{animation:none}.home-btn:hover{transform:none}}.deck-list,.deck-detail,.deck-form-wrap{max-width:640px;margin:var(--space-lg) auto;padding:0 var(--space-md)}.deck-page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:var(--space-lg);flex-wrap:wrap;margin-bottom:var(--space-lg);padding-bottom:var(--space-md);border-bottom:1px solid rgba(45,90,92,.15)}.deck-page-title h1{margin:0;padding:0;font-size:2rem;line-height:1.1;color:var(--primary)}.deck-page-sub{margin:6px 0 0;color:var(--text);opacity:.6;font-size:.92rem}.deck-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:var(--space-md)}.deck-card{background:var(--surface);border:1px solid rgba(45,90,92,.15);border-radius:var(--radius-lg);padding:var(--space-md) var(--space-lg);cursor:pointer;transition:border-color .15s ease,transform .15s ease,box-shadow .15s ease}.deck-card:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:0 2px 8px #1f2c2e14}.deck-card h2{margin:0 0 6px;font-size:1.15rem;color:var(--primary)}.deck-card p{margin:0;color:var(--text);opacity:.7;font-size:.9rem}.deck-tag{display:inline-block;margin-top:10px;padding:2px 10px;font-size:.7rem;text-transform:uppercase;letter-spacing:.04em;border-radius:999px;background:var(--accent);color:#fff}.deck-tag-user{background:transparent;color:var(--primary);border:1px solid rgba(45,90,92,.35)}.deck-card-dates{display:flex;gap:var(--space-lg);margin:var(--space-md) 0 0;padding-top:var(--space-md);border-top:1px solid rgba(45,90,92,.12)}.deck-card-dates dt{font-size:.62rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--primary);opacity:.6}.deck-card-dates dd{margin:2px 0 0;font-size:.82rem;color:var(--text);opacity:.85}.deck-card-actions{display:flex;gap:var(--space-sm);margin-top:var(--space-md)}.deck-status{text-align:center;color:var(--text);opacity:.65;margin:var(--space-lg) 0}.deck-error{color:#c0392b;opacity:1}.deck-empty{display:flex;flex-direction:column;align-items:center;gap:var(--space-md);margin-top:2.5rem}.deck-detail-head{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-lg);flex-wrap:wrap;margin-bottom:var(--space-lg);padding-bottom:var(--space-md);border-bottom:1px solid rgba(45,90,92,.15)}.deck-detail-titles{min-width:0;flex:1 1 260px}.deck-detail-name{margin:0;padding:0;font-size:2.1rem;line-height:1.1;letter-spacing:-.01em;color:var(--primary);word-break:break-word}.deck-detail-desc{margin:10px 0 0;color:var(--text);opacity:.7;font-size:1rem;line-height:1.45}.deck-detail-meta{display:flex;flex-wrap:wrap;gap:var(--space-sm);margin-top:var(--space-md)}.deck-detail-meta span{font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--primary);background:var(--surface);border:1px solid rgba(45,90,92,.18);border-radius:999px;padding:3px 11px;opacity:.85}.deck-study-primary{flex-shrink:0;padding:12px 24px;font-size:1rem;box-shadow:0 2px 8px #2d5a5c2e}.deck-detail-actions{display:flex;flex-wrap:wrap;gap:var(--space-sm);margin-bottom:var(--space-lg)}.card-list{list-style:none;padding:0;margin:0}.card-row{display:flex;justify-content:space-between;gap:var(--space-md);padding:12px var(--space-md);background:var(--surface);border:1px solid rgba(45,90,92,.15);border-radius:var(--radius-md);margin-bottom:10px}.card-front{font-weight:600;color:var(--text)}.card-back{color:var(--text);opacity:.65;text-align:right}.cardrow-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}.cardrow{display:flex;flex-direction:column;gap:10px;padding:var(--space-md);background:var(--surface);border:1px solid rgba(45,90,92,.15);border-radius:var(--radius-md)}.cardrow.editing{border-color:var(--primary)}.cardrow-main{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-md)}.cardrow-text{min-width:0;flex:1 1 auto}.cardrow-front{margin:0;font-weight:600;color:var(--text);word-break:break-word}.cardrow-back{margin:4px 0 0;color:var(--text);opacity:.65;font-size:.92rem;word-break:break-word}.cardrow-actions{display:flex;gap:var(--space-sm);flex-shrink:0}.cardrow.editing .cardrow-actions{margin-top:var(--space-sm)}.cardrow-stats{display:flex;align-items:center;gap:var(--space-sm);padding-top:10px;border-top:1px solid rgba(45,90,92,.1)}.cardrow-pill{font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;padding:2px 10px;border-radius:999px}.cardrow-pill--new{background:#2d5a5c14;color:#4f5e5f}.cardrow-pill--weak{background:#6b7a7b26;color:#4f5e5f}.cardrow-pill--learning{background:#2d5a5c1f;color:var(--primary)}.cardrow-pill--strong{background:var(--primary);color:#fff}.cardrow-statline{font-size:.8rem;color:var(--text);opacity:.6}.cardrow-sep{margin:0 6px;opacity:.5}.deck-btn{display:inline-block;font:inherit;font-size:.95rem;font-weight:600;color:#fff;background:var(--primary);border:none;border-radius:var(--radius-md);padding:12px 18px;cursor:pointer;text-decoration:none;transition:background .15s ease,opacity .15s ease}.deck-btn:hover{background:#234748}.deck-btn:disabled{opacity:.6;cursor:not-allowed}.deck-btn-new{padding:8px 14px;font-size:.85rem}.deck-form-head{margin-bottom:var(--space-lg);padding-bottom:var(--space-md);border-bottom:1px solid rgba(45,90,92,.15)}.deck-form-head h1{margin:0;padding:0;font-size:2rem;line-height:1.1;color:var(--primary)}.deck-form-sub{margin:8px 0 0;font-size:.95rem;color:var(--text);opacity:.65}.deck-subhead{margin-top:2rem;margin-bottom:var(--space-md);font-size:1.25rem;color:var(--primary)}.deck-form{margin-top:var(--space-lg)}.deck-field{margin-bottom:var(--space-md);display:flex;flex-direction:column}.deck-field label{margin-bottom:6px;font-size:13px;font-weight:600;color:var(--primary)}.deck-field .optional{font-weight:400;opacity:.6}.deck-field input,.deck-field textarea,.deck-field select{font:inherit;font-size:15px;padding:10px 12px;border:1px solid rgba(45,90,92,.25);border-radius:var(--radius-md);background:#fff;color:var(--text);transition:border-color .15s ease,box-shadow .15s ease}.deck-field textarea{resize:vertical}.deck-field input:focus,.deck-field textarea:focus,.deck-field select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #e8a58059}.deck-field input[aria-invalid=true],.deck-field textarea[aria-invalid=true]{border-color:#c0392b}.deck-field .error{margin:6px 0 0;color:#c0392b;font-size:12.5px}.deck-api-error{margin-top:var(--space-md);color:#c0392b;font-size:13.5px}.deck-desc{color:var(--text);opacity:.7;margin-bottom:var(--space-lg);line-height:1.5}.deck-doc-link{display:inline-block;margin-top:8px;font-size:.82rem;color:var(--primary);opacity:.8;text-decoration:underline;text-underline-offset:2px}.deck-doc-link:hover{opacity:1}.deck-header-actions{display:flex;gap:var(--space-sm);flex-wrap:wrap}.deck-btn-secondary{background:transparent;color:var(--primary);border:1px solid rgba(45,90,92,.3);padding:8px 14px;font-size:.85rem}.deck-btn-secondary:hover{background:#2d5a5c0f}.deck-toggle{display:flex;gap:var(--space-sm)}.deck-toggle-on,.deck-toggle-off{font:inherit;font-size:.9rem;padding:8px 14px;border-radius:var(--radius-md);cursor:pointer;border:1px solid rgba(45,90,92,.3)}.deck-toggle-on{background:var(--primary);color:#fff;border-color:var(--primary)}.deck-toggle-off{background:transparent;color:var(--primary)}.deck-link-btn{font:inherit;font-size:.8rem;margin-left:var(--space-md);color:#c0392b;background:none;border:none;cursor:pointer;text-decoration:underline}.deck-notice{margin-top:var(--space-md);color:var(--primary);font-size:13.5px}.key-provider{color:var(--primary);opacity:.7;font-weight:400}.key-usage{display:block;margin-top:4px;font-size:.75rem;font-weight:400;color:var(--text);opacity:.6}.study-area{display:flex;flex-direction:column;align-items:center;gap:var(--space-lg);margin-top:var(--space-md)}.study-bar{width:100%;max-width:480px}.study-bar-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.study-count{font-size:.9rem;font-weight:600;color:var(--primary)}.study-count-total{font-weight:400;opacity:.55}.study-score{display:flex;align-items:center;gap:var(--space-sm);font-size:.85rem;font-weight:600}.study-score-sep{opacity:.35;font-weight:400}.study-score-right{color:var(--primary)}.study-score-wrong{color:#6b7a7b}.study-track{width:100%;height:8px;background:#2d5a5c1f;border-radius:999px;overflow:hidden}.study-fill{height:100%;background:var(--primary);border-radius:999px;transition:width .3s ease}.study-hint{margin:0;font-size:.85rem;color:var(--text);opacity:.5}.study-cardstat{margin:0;font-size:.85rem;color:var(--text);opacity:.65}.study-cardstat strong{color:var(--primary);font-weight:700}.study-actions{display:flex;gap:var(--space-md)}.study-again{background:transparent;color:#4f5e5f;border:1px solid rgba(45,90,92,.3)}.study-again:hover{background:#2d5a5c0f}.study-known{background:var(--primary)}.study-known:hover{background:#234748}.study-results{max-width:420px;margin:var(--space-lg) auto 0;text-align:center;background:var(--surface);border:1px solid rgba(45,90,92,.15);border-radius:var(--radius-lg);padding:var(--space-lg)}.study-results-eyebrow{margin:0;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.14em;color:var(--primary);opacity:.6}.study-results-score{display:flex;flex-direction:column;align-items:center;margin:var(--space-md) 0 var(--space-sm)}.study-results-pct{font-size:3.4rem;font-weight:800;line-height:1;letter-spacing:-.02em;color:var(--primary)}.study-results-label{margin-top:4px;font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text);opacity:.55}.study-results-verdict{margin:0 0 var(--space-lg);font-size:1.05rem;color:var(--text);opacity:.8}.study-results-breakdown{display:flex;justify-content:center;gap:var(--space-lg);padding:var(--space-md) 0;margin-bottom:var(--space-lg);border-top:1px solid rgba(45,90,92,.12);border-bottom:1px solid rgba(45,90,92,.12)}.study-stat{display:flex;flex-direction:column;gap:2px}.study-stat-num{font-size:1.5rem;font-weight:700;color:var(--text)}.study-stat-right{color:var(--primary)}.study-stat-wrong{color:#6b7a7b}.study-stat-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text);opacity:.55}.study-results-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:var(--space-md)}.flashcard{width:100%;max-width:480px;height:260px;perspective:1200px;cursor:pointer;outline:none}.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .5s ease;transform-style:preserve-3d}.flashcard.is-flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:var(--space-lg);border-radius:var(--radius-lg);backface-visibility:hidden;-webkit-backface-visibility:hidden;box-shadow:0 2px 10px #1f2c2e14}.flashcard-front{background:var(--surface);border:1px solid rgba(45,90,92,.18)}.flashcard-front h3{margin:0;color:var(--primary);font-size:1.3rem;line-height:1.4}.flashcard-back{background:#dce8e5;border:1px solid rgba(45,90,92,.28);transform:rotateY(180deg)}.flashcard-back p{margin:0;color:var(--text);font-size:1.1rem;line-height:1.5}.flashcard-tap{position:absolute;bottom:10px;left:0;right:0;font-size:.68rem;letter-spacing:.04em;color:var(--text);opacity:.4}.deck-back-pill{display:inline-flex;align-items:center;gap:6px;margin-bottom:var(--space-lg);padding:6px 14px;font-size:.82rem;font-weight:600;color:var(--primary);background:var(--surface);border:1px solid rgba(45,90,92,.2);border-radius:999px;text-decoration:none;transition:background .15s ease,border-color .15s ease}.deck-back-pill:before{content:"‹";font-size:1.1em;line-height:1;opacity:.7}.deck-back-pill:hover{background:#2d5a5c14;border-color:var(--primary)}.card-detail{margin-top:var(--space-lg)}.card-detail-field{margin-bottom:var(--space-lg)}.card-detail-label{display:block;margin-bottom:6px;font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--primary);opacity:.8}.card-detail-text{margin:0;font-size:1.05rem;color:var(--text)}.card-detail-link{color:var(--primary);text-decoration:none}.card-detail-link:hover{text-decoration:underline}.card-detail-image{max-width:100%;border-radius:var(--radius-md);border:1px solid rgba(45,90,92,.15)}.deck-detail-actions,.deck-form-actions{display:flex;flex-wrap:wrap;gap:var(--space-md);margin-bottom:var(--space-lg)}.deck-btn-danger{background:transparent;color:#c0392b;border:1px solid rgba(192,57,43,.4)}.deck-btn-danger:hover{background:#c0392b14}.card-row-foot{display:flex;align-items:center;justify-content:space-between;gap:var(--space-sm);margin-top:var(--space-md)}.card-study-btn{flex-shrink:0}.card-row-foot .deck-tag{margin-top:0}.card-create-head{margin-bottom:var(--space-lg);padding-bottom:var(--space-md);border-bottom:1px solid rgba(45,90,92,.15)}.card-create-head h1{margin:0;padding:0;font-size:2rem;line-height:1.1;color:var(--primary)}.card-create-sub{margin:8px 0 0;font-size:.95rem;color:var(--text);opacity:.7}.card-create-sub strong{color:var(--primary);font-weight:600}.card-create-actions{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-md);margin-top:var(--space-lg)}.auth{min-height:calc(100vh - 64px);display:flex;align-items:center;justify-content:center;padding:var(--space-lg)}.auth-card{width:100%;max-width:400px;background:var(--surface);border:1px solid rgba(45,90,92,.12);border-radius:var(--radius-lg);padding:32px;box-shadow:0 1px 3px #1f2c2e0f}.auth-card h1{font-family:sans-serif;font-size:26px;font-weight:600;color:var(--primary);padding:0;margin-bottom:var(--space-sm)}.auth-sub{color:var(--text);opacity:.7;font-size:14px;margin-bottom:var(--space-lg)}.auth-field{display:flex;flex-direction:column;margin-bottom:var(--space-md)}.auth-field label{font-size:13px;font-weight:600;color:var(--primary);margin-bottom:6px}.auth-field input{font:inherit;font-size:15px;padding:10px 12px;border:1px solid rgba(45,90,92,.25);border-radius:var(--radius-md);background:#fff;color:var(--text);transition:border-color .15s ease,box-shadow .15s ease}.auth-field input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #e8a58059}.auth-field input[aria-invalid=true]{border-color:#c0392b}.auth-field .error{color:#c0392b;font-size:12.5px;margin-top:6px}.auth-btn{width:100%;font:inherit;font-size:15px;font-weight:600;color:#fff;background:var(--primary);border:none;border-radius:var(--radius-md);padding:12px;cursor:pointer;margin-top:var(--space-sm);transition:background .15s ease,opacity .15s ease}.auth-btn:hover{background:#234748}.auth-btn:disabled{opacity:.6;cursor:not-allowed}.auth-api-error{color:#c0392b;font-size:13.5px;text-align:center;margin-top:var(--space-md)}.auth-switch{text-align:center;font-size:13.5px;color:var(--text);opacity:.85;margin-top:var(--space-lg);padding-top:var(--space-lg);border-top:1px solid rgba(45,90,92,.12)}.auth-switch a{color:var(--primary);font-weight:600;text-decoration:none}.auth-switch a:hover{text-decoration:underline}nav{display:flex;justify-content:space-between;align-items:center;padding:var(--space-md) var(--space-lg);background:var(--surface);border-bottom:1px solid rgba(45,90,92,.12)}nav .brand{font-weight:600;font-size:18px;color:var(--primary);text-decoration:none}nav ul{display:flex;gap:var(--space-lg);list-style:none;margin:0;padding:0}nav a{color:var(--text);text-decoration:none}nav a:hover{color:var(--primary)}nav .nav-logout{background:none;border:none;padding:0;margin:0;font:inherit;color:var(--text);cursor:pointer}nav .nav-logout:hover{color:var(--primary)}