:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#173b51;background:#f3f6f9;font-size:16px;--blue:#245976;--muted:#5f7586;--line:#dce5eb;--green:#227457;--red:#b53438}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer;border:1px solid var(--line);border-radius:12px;padding:12px 17px;min-height:46px;background:#fff;color:var(--blue);font-weight:650}button:disabled{opacity:.5;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #df9b2e;outline-offset:3px}button.primary{background:var(--blue);color:white;border-color:var(--blue)}button.danger{color:var(--red)}button.good{background:#e0f2e9;color:var(--green)}button.bad{background:#fdecee;color:var(--red)}button.quiet{background:transparent}.top{max-width:1120px;margin:auto;padding:24px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:inherit;font-weight:750}.brand small{display:block;font-size:.8rem;font-weight:400;color:var(--muted);margin-top:3px}main{max-width:1060px;margin:auto;padding:18px 24px 130px}h1{font-size:clamp(1.8rem,4vw,2.8rem);letter-spacing:-.04em;margin:8px 0 14px;line-height:1.15}h2{font-size:1.2rem;margin:0 0 14px}h3{margin:0;font-size:1rem}p{line-height:1.6}.eyebrow{font-size:.78rem;letter-spacing:.15em;font-weight:750;color:var(--muted);margin:0}.muted,small{color:var(--muted)}.grid{display:grid;grid-template-columns:1.35fr 1fr;gap:22px}.panel{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px;margin-bottom:20px}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.spread{justify-content:space-between}.stack{display:grid;gap:12px}.field{display:grid;gap:7px;font-size:.9rem;font-weight:600}.field input,.field select,input.answer{width:100%;padding:13px;border:1px solid #bbcad5;border-radius:10px;background:white;color:inherit;min-height:48px}input[type=checkbox]{width:20px;height:20px;accent-color:var(--blue)}.unit{display:flex;gap:12px;align-items:center;border:1px solid var(--line);padding:13px;border-radius:12px;cursor:pointer}.unit:has(input:checked){border-color:var(--blue);background:#eff6fa}.unit span{flex:1}.unit small{display:block;font-weight:400;margin-top:4px}.unit i{width:5px;align-self:stretch;border-radius:5px;background:var(--unit-color,#45829c)}.pill{padding:6px 10px;border-radius:20px;background:#edf3f8;font-size:.8rem;white-space:nowrap}.notice{border-left:3px solid #d99a36;padding:12px 16px;background:#fff6e4;border-radius:4px;color:#73521f;line-height:1.5;margin:16px 0}.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.mode{display:block;border:1px solid var(--line);border-radius:12px;padding:14px;cursor:pointer}.mode:has(input:checked){background:#eaf2f8;border-color:var(--blue)}.mode input{accent-color:var(--blue)}.mode small{display:block;margin-top:8px}.bottom{position:fixed;bottom:0;left:0;right:0;display:flex;justify-content:center;background:#fffffff2;backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:8px 12px calc(8px + env(safe-area-inset-bottom));z-index:10}.bottom button{border:0;background:none;min-width:80px;max-width:180px;flex:1;font-size:1.3rem;border-radius:10px}.bottom span{display:block;font-size:.8rem;margin-top:3px}.bottom [aria-current=page]{background:#eaf2f8}progress{width:100%;height:10px;accent-color:var(--green);border:0;border-radius:10px;overflow:hidden}.study{max-width:720px;margin:auto}.flashcard{position:relative;border:14px solid var(--card-color,#376887);border-radius:22px;background:white;text-align:center;min-height:290px;display:flex;flex-direction:column;justify-content:center;padding:32px 22px;margin:22px 0;overflow:hidden}.flashcard.irregular{border-color:#e4edf3}.flags{font-size:15px;letter-spacing:4px;position:absolute;white-space:nowrap;overflow:hidden;left:0;right:0;line-height:20px}.flags.top-flags{top:0}.flags.bottom-flags{bottom:0}.flags.left-flags,.flags.right-flags{writing-mode:vertical-rl;top:20px;bottom:20px;left:0;right:auto;letter-spacing:3px}.flags.right-flags{left:auto;right:0}.prompt{font-size:clamp(1.7rem,6vw,2.5rem);font-weight:750;line-height:1.3;margin:18px 0;overflow-wrap:anywhere}.english{color:var(--red)}.solution{font-size:1.5rem;font-weight:700;margin:12px 0}.review-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px}.answer-area{display:grid;gap:12px}.full{width:100%}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.metric{border:1px solid var(--line);border-radius:14px;padding:18px;background:white}.metric strong{display:block;font-size:1.8rem;margin-bottom:4px}.metric span{font-size:.85rem;color:var(--muted)}.word{border-bottom:1px solid var(--line);padding:14px 0}.word:last-child{border:0}.word strong{overflow-wrap:anywhere}.word button{padding:8px 12px}.log{overflow:auto}.log table{border-collapse:collapse;width:100%;font-size:.9rem}.log th,.log td{text-align:left;border-bottom:1px solid var(--line);padding:12px;white-space:nowrap}#message:not(:empty){position:fixed;bottom:100px;left:50%;transform:translateX(-50%);max-width:min(90vw,650px);padding:14px 20px;background:#173b51;color:white;border-radius:12px;z-index:100;box-shadow:0 5px 25px #0002}.toggle{display:flex;align-items:center;gap:12px;line-height:1.5}.bar{height:8px;background:#e5edf2;border-radius:10px;overflow:hidden}.bar span{display:block;height:100%;background:var(--green)}.help{font-size:.85rem;line-height:1.5}.login{max-width:650px;margin:40px auto}.completion{text-align:center;padding:35px}.completion .big{font-size:4rem;color:var(--green)}@media(max-width:720px){.top{padding:16px}.brand small{display:none}main{padding:10px 16px 120px}.grid{grid-template-columns:1fr;gap:0}.panel{padding:18px;border-radius:16px}.metrics{gap:7px}.metric{padding:12px}.metric strong{font-size:1.5rem}.flashcard{min-height:265px;padding:28px 15px}.bottom button{min-width:0;padding:8px}.mode-grid{gap:8px}.top #account{max-width:45%;overflow:hidden;text-overflow:ellipsis}.row>*{min-width:0}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
:root{--flag-gap:4px}
.flashcard.irregular{border:0;padding:42px 44px;box-shadow:inset 0 0 0 1px #dce5eb}
.flashcard.irregular .flags{display:flex;gap:var(--flag-gap);position:absolute;overflow:hidden;pointer-events:none;line-height:normal;letter-spacing:normal;writing-mode:horizontal-tb;background:#e4edf3;padding:4px}
.flashcard.irregular .top-flags,.flashcard.irregular .bottom-flags{left:0;right:0;height:26px;align-items:center}
.flashcard.irregular .top-flags{top:0}.flashcard.irregular .bottom-flags{bottom:0}
.flashcard.irregular .left-flags,.flashcard.irregular .right-flags{top:26px;bottom:26px;width:38px;flex-direction:column;align-items:center;justify-content:flex-start;left:0;right:auto}
.flashcard.irregular .right-flags{left:auto;right:0}
.country-flag{display:block;width:30px;height:15px;flex:0 0 auto;overflow:hidden;box-shadow:0 0 0 1px #173b5120}
:root{--connection-ok:#227457}
.connection-bar{max-width:1060px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:.85rem}
#connection-status{display:inline-flex;align-items:center;gap:8px;line-height:1.5;color:#5f7586}
#connection-status::before{content:'';width:9px;height:9px;border-radius:50%;background:currentColor;flex-shrink:0}
#connection-status[data-tone=ok]{color:var(--connection-ok)}
#connection-status[data-tone=error]{color:#b53438}
#connection-status[data-tone=warning]{color:#886117}
#connection-status[data-tone=pending]{color:#245976}
#check-connection[hidden]{display:none}