@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap";:root{--sidebar-width:220px;--content-max-width:1440px;--font-family-sans:"Inter", system-ui, sans-serif;--font-size-body:var(--font-size-md);--font-size-xxs:9px;--font-size-xs:11px;--font-size-sm:12px;--font-size-md:14px;--font-size-lg:16px;--font-size-xl:20px;--font-size-card-title:18px;--font-weight-regular:400;--font-weight-medium:500;--font-weight-semibold:600;--font-weight-bold:700;--font-weight-extrabold:800;--line-height-body:1.5;--line-height-tight:1.15;--space-1:4px;--space-2:6px;--space-3:8px;--space-4:10px;--space-5:12px;--space-6:14px;--space-7:16px;--space-8:18px;--space-9:20px;--space-10:24px;--space-11:28px;--space-12:32px;--space-13:38px;--space-14:40px;--space-15:52px;--chat-fade-height:128px;--chat-bottom-space:176px;--mobile-touch-target:44px;--mobile-icon-size:24px;--radius-sm:5px;--radius-md:8px;--radius-lg:10px;--radius-xl:13px;--radius-2xl:14px;--radius-card:16px;--radius-pill:999px;--shadow-sm:0 7px 18px #00000014;--shadow-md:0 8px 24px #00000014;--shadow-lg:0 10px 25px #0003;--focus-ring:#1877f273;--color-primary:#1877f2;--color-primary-hover:#0d6efd;--color-primary-soft:#e7f3ff;--color-primary-pale:#f5f9ff;--color-primary-muted:#8cb4f7;--color-text:#050505;--color-text-muted:#65676b;--color-text-inverse:#fff;--color-sidebar-text:#eaf2ff;--color-sidebar-muted:#c7dcff;--color-page:#f0f2f5;--color-page-deep:#e4e6eb;--color-surface:#fff;--color-border:#dadde1;--color-accent:#f7b928;--color-accent-soft:#fff4d6;--color-accent-strong:#8a6500;--color-success:#4777c8;--color-success-text:#267a3e;--color-success-soft:#eaf7ed;--color-success-border:#b9e3c1;--color-danger:#a25e54;--paper:var(--color-page);--paper-deep:var(--color-page-deep);--ink:var(--color-text);--muted:var(--color-text-muted);--line:var(--color-border);--navy:var(--color-primary);--navy-dark:var(--color-primary-hover);--mint:var(--color-primary-soft);--mint-pale:var(--color-primary-pale);--mint-strong:var(--color-primary-muted);--coral:var(--color-accent);--coral-pale:var(--color-accent-soft);--white:var(--color-surface);--shadow:var(--shadow-md)}.c-surface{border:1px solid var(--line);border-radius:var(--radius-2xl);background:var(--white)}.c-surface--elevated{box-shadow:var(--shadow)}.c-button{font:inherit;cursor:pointer;border:0}.c-icon-button{background:0 0;border:0;place-items:center;display:grid}.c-pill{border-radius:var(--radius-sm);align-items:center;width:fit-content;display:inline-flex}.c-media{object-fit:contain;background:var(--paper-deep);width:100%;display:block}.c-status{min-height:16px;color:var(--muted);font-size:var(--font-size-sm)}.c-control{font:inherit}#app,.app-shell{min-height:100vh}.main-content{min-width:0}.view[hidden],.search-panel[hidden],.image-preview[hidden]{display:none}.component-icon,.nav-item svg,.settings-link svg,.text-button svg,.star-button svg,.pronunciation button svg,.round-arrow svg,.search-input-wrap svg{flex:none}@media (prefers-reduced-motion:reduce){.flashcard,.nav-item,.answer-button,.primary-button,.filter-chip,.topic-tab{transition:none}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);min-width:320px;color:var(--ink);font-family:var(--font-family-sans);font-size:var(--font-size-body);font-weight:var(--font-weight-medium);margin:0}button,input{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,.flashcard:focus-visible{outline:3px solid var(--focus-ring);outline-offset:3px}.app-shell{min-height:100vh}.sidebar{z-index:20;width:var(--sidebar-width);height:100vh;padding:var(--space-12) var(--space-8) var(--space-10);background:var(--navy);color:var(--color-sidebar-text);flex-direction:column;display:flex;position:fixed;inset:0 auto 0 0;overflow-y:auto}.brand{align-items:center;gap:var(--space-4);color:var(--white);font-family:var(--font-family-sans);letter-spacing:-.7px;font-size:19px;font-weight:800;text-decoration:none;display:inline-flex}.brand-dot{color:var(--coral)}.brand-mark{align-items:end;gap:3px;width:27px;height:25px;display:inline-flex;position:relative}.brand-mark span{background:var(--mint-strong);border-radius:5px 5px 2px 2px;width:6px;transform:rotate(34deg)}.brand-mark span:first-child{height:15px;margin-bottom:3px}.brand-mark span:nth-child(2){background:var(--coral);height:22px}.brand-mark span:nth-child(3){background:#c1d4f7;height:13px;margin-bottom:1px}.main-nav{gap:var(--space-3);margin-top:76px;display:grid}.nav-item,.settings-link{border-radius:var(--radius-lg);padding:var(--space-5) 13px;color:var(--color-sidebar-text);text-align:left;font-size:var(--font-size-body);background:0 0;border:0;align-items:center;gap:13px;font-weight:600;transition:all .2s;display:flex}.nav-item svg,.settings-link svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.7px;width:18px;height:18px}.nav-item:hover,.settings-link:hover{color:var(--white);background:#ffffff14}.nav-item.is-active{color:var(--navy-dark);background:var(--mint);box-shadow:var(--shadow-sm)}.settings-link{padding-left:10px}.main-content{width:calc(100% - var(--sidebar-width));min-width:0;margin:0 0 0 var(--sidebar-width);padding:0 52px 70px}.search-input-wrap{width:100%;position:relative}.search-input-wrap svg{fill:none;width:17px;height:17px;stroke:var(--muted);stroke-linecap:round;stroke-linejoin:round;stroke-width:1.7px;position:absolute;top:12px;left:14px}.search-input-wrap input{border:1px solid var(--line);border-radius:var(--radius-lg);width:100%;min-height:44px;color:var(--ink);background:var(--white);font-size:var(--font-size-xl);outline:0;padding:10px 14px 10px 40px}.search-input-wrap input:focus{border-color:var(--mint-strong)}.library-search{width:min(100%,560px);margin-top:24px}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.view{max-width:var(--content-max-width);margin-left:auto;margin-right:auto;padding-top:46px;display:none}.view.is-visible{display:block}.welcome-row{justify-content:space-between;align-items:end;gap:25px;display:flex}.eyebrow,.section-label{color:var(--muted);font-size:var(--font-size-sm);letter-spacing:.13em;font-weight:800}.eyebrow{margin:0 0 12px}h1,h2,h3,p{margin-top:0}h1{font-family:var(--font-family-sans);letter-spacing:-1.4px;margin-bottom:10px;font-size:clamp(28px,3vw,37px);line-height:1.12}.wave{color:var(--coral);font-size:25px;display:inline-block;transform:rotate(20deg)}.welcome-copy{color:var(--muted);font-size:var(--font-size-body);margin-bottom:0}.streak-card{border-left:1px solid var(--line);align-items:center;gap:11px;padding:10px 0 8px 20px;display:flex}.streak-spark,.session-icon{width:38px;height:38px;color:var(--color-accent-strong);background:var(--coral-pale);border-radius:12px;place-items:center;font-size:17px;display:grid}.streak-card strong,.streak-card small{display:block}.streak-card strong{font-family:var(--font-family-sans);font-size:var(--font-size-lg)}.streak-card small{color:var(--muted);font-size:var(--font-size-sm);margin-top:3px}.daily-banner{background:var(--navy);min-height:132px;color:var(--white);border-radius:15px;justify-content:space-between;align-items:center;gap:20px;margin-top:38px;padding:27px 34px;display:flex;position:relative;overflow:hidden}.daily-banner:after{content:"";border:1px solid #d8eee62e;border-radius:50%;width:210px;height:210px;position:absolute;bottom:-78px;right:44px;box-shadow:0 0 0 22px #d8eee60a,0 0 0 48px #d8eee606}.banner-copy,.goal-progress{z-index:1;position:relative}.banner-kicker{color:#b7cdf5;font-size:var(--font-size-xxs);letter-spacing:.15em;font-weight:800}.banner-copy h2{font-family:var(--font-family-sans);letter-spacing:-.5px;margin:8px 0 6px;font-size:19px}.banner-copy p{color:var(--color-sidebar-muted);font-size:var(--font-size-md);margin:0}.goal-progress{align-items:center;gap:13px;margin-right:4px;display:flex}.progress-ring{--progress:30%;background:conic-gradient(var(--mint-strong) var(--progress), #ffffff24 0);border-radius:50%;place-items:center;width:71px;height:71px;display:grid;position:relative}.progress-ring:after{content:"";background:var(--navy);border-radius:50%;position:absolute;inset:6px}.progress-ring span{z-index:1;color:var(--mint);font-size:var(--font-size-body);font-weight:800;position:relative}.goal-progress strong,.goal-progress small{display:block}.goal-progress strong{font-size:17px}.goal-progress small{color:var(--color-sidebar-muted);font-size:var(--font-size-sm);margin-top:2px}.study-layout{grid-template-columns:minmax(0,1fr) 270px;gap:42px;margin-top:42px;display:grid}.section-heading,.side-card-heading{justify-content:space-between;align-items:start;gap:16px;display:flex}.section-heading h2{font-family:var(--font-family-sans);letter-spacing:-.7px;margin:7px 0 0;font-size:21px}.heading-actions{align-items:center;gap:18px;display:flex}.text-button{color:var(--muted);font-size:var(--font-size-meta);background:0 0;border:0;align-items:center;gap:6px;font-weight:700;display:flex}.text-button:hover{color:var(--navy)}.text-button svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.7px;width:15px;height:15px}.card-count{color:var(--muted);font-size:var(--font-size-meta);font-variant-numeric:tabular-nums}.topic-tabs{border-bottom:1px solid var(--line);gap:23px;margin-top:23px;display:flex}.topic-tab{color:var(--muted);font-size:var(--font-size-meta);background:0 0;border:0;padding:0 0 12px;font-weight:700;position:relative}.topic-tab:after{content:"";background:0 0;border-radius:2px;height:2px;position:absolute;bottom:-1px;left:0;right:0}.topic-tab:hover,.topic-tab.is-active{color:var(--navy)}.topic-tab.is-active:after{background:var(--coral)}.flashcard{border-radius:var(--radius-card);background:var(--white);min-height:390px;box-shadow:var(--shadow);border:1px solid #1e3d4214;flex-direction:column;justify-content:space-between;margin-top:27px;padding:27px 31px 20px;display:flex;position:relative;overflow:hidden}.flashcard.is-flipped{background:#f2f6ff}.flashcard-glow{pointer-events:none;background:radial-gradient(circle,#d8eee6d9,#d8eee600 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.card-back{display:flex}.flashcard.is-flipped .flip-dots i:first-child{background:var(--line)}.flashcard.is-flipped .flip-dots i:last-child{background:var(--navy)}.card-overline{color:var(--coral);font-size:var(--font-size-xxs);letter-spacing:.17em;margin-bottom:16px;font-weight:800}.card-face h3{max-width:670px;color:var(--navy);font-family:var(--font-family-sans);letter-spacing:-1.8px;margin-bottom:17px;font-size:clamp(27px,4vw,42px);line-height:1.15}.pronunciation{color:var(--muted);font-size:var(--font-size-md);align-items:center;gap:9px;display:flex}.pronunciation button{width:26px;height:26px;color:var(--navy);background:var(--mint);border:0;border-radius:50%;place-items:center;display:grid}.pronunciation button:hover{background:var(--mint-strong)}.pronunciation svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.7px;width:14px;height:14px}.reveal-hint{color:var(--muted);font-size:var(--font-size-sm);background:0 0;border:0;align-items:center;gap:7px;margin-top:34px;display:flex}.reveal-hint:hover{color:var(--navy)}.hint-icon{border:1px solid var(--line);width:20px;height:20px;font-size:var(--font-size-md);border-radius:50%;place-items:center;display:grid}.example-box{border-left:2px solid var(--coral);background:var(--paper);text-align:left;border-radius:0 7px 7px 0;width:min(100%,430px);padding:13px 16px}.example-box span{color:var(--muted);font-size:var(--font-size-xs);letter-spacing:.12em;font-weight:800}.example-box p{color:var(--navy);font-size:var(--font-size-md);margin:6px 0 0;line-height:1.45}.card-note{max-width:490px;color:var(--muted);font-size:var(--font-size-meta);margin:17px 0 0}.word-family{border-top:1px solid var(--line);text-align:left;width:min(100%,490px);margin-top:18px;padding-top:15px}.word-family-heading{justify-content:space-between;align-items:center;gap:10px;display:flex}.word-family-heading .card-overline{margin:0}.word-family-root{color:var(--muted);font-size:var(--font-size-xxs)}.word-family-list{flex-wrap:wrap;gap:7px;margin-top:10px;display:flex}.related-word{border:1px solid var(--line);border-radius:var(--radius-md);color:var(--ink);background:var(--paper);text-align:left;align-items:center;gap:7px;padding:7px 9px;display:inline-flex}.related-word:hover{border-color:var(--mint-strong);background:var(--mint)}.related-word strong{font-size:var(--font-size-meta)}.related-word small{color:var(--muted);font-size:var(--font-size-xs);letter-spacing:.08em;text-transform:uppercase;font-weight:800}.flip-label{color:var(--muted);font-size:var(--font-size-xxs);justify-content:center;align-items:center;gap:10px;display:flex}.flip-dots{gap:4px;display:flex}.flip-dots i{background:var(--line);border-radius:50%;width:5px;height:5px;display:block}.flip-dots i.is-active{background:var(--navy)}.study-controls{margin-top:22px}.control-hint{color:var(--muted);text-align:center;font-size:var(--font-size-sm);margin-bottom:15px}kbd{border:1px solid var(--line);min-width:17px;height:17px;color:var(--muted);background:var(--white);font-size:var(--font-size-xxs);border-radius:4px;place-items:center;padding:0 4px;font-family:inherit;display:inline-grid}.control-hint span{color:#bdc7d8;margin:0 5px}.answer-buttons{grid-template-columns:1fr 1fr;gap:12px;display:grid}.answer-button{border:1px solid var(--line);border-radius:var(--radius-lg);min-height:58px;color:var(--ink);background:var(--white);text-align:left;align-items:center;gap:11px;padding:10px 13px;display:flex}.answer-button:hover{border-color:var(--mint-strong);transform:translateY(-1px)}.answer-button .answer-icon{border-radius:var(--radius-md);place-items:center;width:28px;height:28px;font-size:17px;display:grid}.answer-again .answer-icon{color:var(--color-accent-strong);background:var(--coral-pale)}.answer-good .answer-icon{color:var(--color-success);background:var(--mint)}.answer-button strong,.answer-button small{display:block}.answer-button strong{font-size:var(--font-size-meta)}.answer-button small{color:var(--muted);font-size:var(--font-size-xxs);margin-top:2px}.answer-button kbd{margin-left:auto}.right-rail{align-content:start;gap:17px;padding-top:48px;display:grid}.side-card{border:1px solid var(--line);border-radius:var(--radius-xl);background:#fffefab8;padding:21px 20px}.side-card-heading h3{font-family:var(--font-family-sans);font-size:var(--font-size-lg);letter-spacing:-.3px;margin:7px 0 0}.side-card-heading .section-label{font-size:var(--font-size-xs)}.session-icon{width:30px;height:30px;font-size:var(--font-size-body);border-radius:9px}.session-bar{border-radius:var(--radius-lg);background:var(--paper-deep);height:6px;margin-top:22px;overflow:hidden}.session-bar span{border-radius:var(--radius-lg);background:var(--mint-strong);width:30%;height:100%;transition:width .3s;display:block}.session-stats{grid-template-columns:repeat(3,1fr);margin-top:16px;display:grid}.session-stats span+span{border-left:1px solid var(--line);padding-left:12px}.session-stats strong,.session-stats small{display:block}.session-stats strong{font-family:var(--font-family-sans);font-size:15px}.session-stats small{color:var(--muted);font-size:var(--font-size-xxs);margin-top:3px}.mini-arrow{color:var(--coral);font-size:var(--font-size-xl)}.continue-item{border-top:1px solid var(--line);align-items:center;gap:10px;margin-top:20px;padding-top:14px;display:flex}.continue-icon{width:31px;height:31px;color:var(--color-accent-strong);background:var(--coral-pale);font-size:var(--font-size-md);border-radius:9px;place-items:center;display:grid}.continue-item strong,.continue-item small{display:block}.continue-item strong{font-size:var(--font-size-meta)}.continue-item small{color:var(--muted);font-size:var(--font-size-xxs);margin-top:4px}.round-arrow{border:1px solid var(--line);width:26px;height:26px;color:var(--navy);background:0 0;border-radius:50%;place-items:center;margin-left:auto;display:grid}.round-arrow:hover{background:var(--mint)}.quote-card{border-radius:var(--radius-xl);color:#f6f8ff;background:var(--navy-dark);padding:20px}.quote-mark{height:22px;color:var(--coral);font-family:var(--font-family-sans);font-size:37px;line-height:1;display:block}.quote-card p{color:#dce6ff;font-family:var(--font-family-sans);margin:5px 0 14px;font-size:15px;line-height:1.35}.quote-author{color:#9aafd8;font-size:var(--font-size-xxs)}.page-heading{max-width:610px}.page-heading h1{margin-bottom:12px}.page-heading>p:last-child{color:var(--muted);font-size:var(--font-size-body)}.library-toolbar{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;margin-top:40px;padding-bottom:14px;display:flex}.library-filters{flex-wrap:wrap;gap:8px;display:flex}.filter-chip{border:1px solid var(--line);border-radius:var(--radius-pill);color:var(--muted);font-size:var(--font-size-meta);background:0 0;padding:8px 13px;font-weight:700}.filter-chip:hover,.filter-chip.is-active{border-color:var(--navy);color:var(--white);background:var(--navy)}.library-tools{align-items:center;gap:8px;display:flex}.library-sort-label{color:var(--muted);font-size:var(--font-size-sm)}.library-sort{border:1px solid var(--line);min-height:32px;color:var(--ink);background:var(--white);font-size:var(--font-size-sm);border-radius:7px;padding:0 28px 0 10px}.library-shuffle{border:1px solid var(--line);width:32px;height:32px;color:var(--navy);background:var(--white);border-radius:7px;place-items:center;font-size:18px;line-height:1;display:grid}.library-shuffle:hover{border-color:var(--mint-strong);background:var(--mint)}.library-total{color:var(--muted);font-size:var(--font-size-meta)}.library-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:20px;display:grid}.library-card{border:1px solid var(--line);border-radius:var(--radius-xl);background:var(--white);cursor:pointer;flex-direction:column;justify-content:space-between;min-height:157px;display:flex;overflow:hidden}.library-card:focus-visible{outline-offset:3px;outline:3px solid #1877f273}.library-card-image{aspect-ratio:3/2;object-fit:contain;background:var(--paper-deep);width:100%;display:block}.library-card-body{flex-direction:column;flex:1;justify-content:space-between;padding:19px;display:flex}.library-card-top{justify-content:space-between;align-items:start;gap:10px;display:flex}.library-card 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0;min-width:0}.simple-chat-page{height:100dvh;min-height:100dvh}.simple-chat-messages{min-height:0;padding:62px 0 var(--chat-bottom-space)}.simple-chat-messages .ai-chat-message{max-width:88%}.simple-chat-send{width:38px;height:38px;font-size:16px}.simple-chat-composer .ai-chat-form{padding:3px 6px 3px 12px}.simple-chat-composer .ai-chat-form input{height:38px;padding:0}.ai-spark{width:42px;height:42px;font-size:var(--font-size-lg);flex-basis:42px}.secondary-button,.form-actions .primary-button{min-height:48px;font-size:var(--font-size-md);padding:12px 16px}.form-actions{flex-direction:column;align-items:stretch}.form-actions .primary-button{justify-content:center;width:100%}.upload-icon{width:40px;height:40px;font-size:var(--font-size-xl);flex:0 0 40px}.image-preview button{width:var(--mobile-touch-target);height:var(--mobile-touch-target)}.simple-chat-composer{width:calc(100vw - 32px);left:50%;bottom:calc(68px + env(safe-area-inset-bottom) + 10px)}#view-ask .simple-chat-composer{width:calc(100vw - 32px);left:50%}.detail-hero{grid-template-columns:1fr}.detail-image{aspect-ratio:3/2;width:100%;height:auto;min-height:0;max-height:none}.detail-heading{padding:24px 20px 27px}.detail-content{grid-template-columns:1fr;gap:0;padding:12px 20px 24px}.detail-section:nth-child(-n+2){padding-top:20px}.detail-section:nth-last-child(-n+2){border-bottom:1px solid var(--line)}.detail-family-section{border-bottom:0!important}}