:root{color-scheme:light;--radius: 24px;--radius-sm: 15px;--shadow: 0 22px 60px rgb(13 20 56 / .18);--shadow-soft: 0 10px 28px rgb(13 20 56 / .12);--focus: 0 0 0 4px color-mix(in srgb, var(--accent) 38%, transparent);--font: Inter, ui-rounded, "SF Pro Rounded", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--display-font: "Arial Rounded MT Bold", Inter, ui-rounded, system-ui, sans-serif}html[data-theme=mission]{--bg: #eef3ff;--surface: #ffffff;--surface-2: #e0e9ff;--surface-3: #cbd9ff;--text: #14204a;--muted: #5d688e;--accent: #5b4dff;--accent-2: #ff5ca8;--accent-contrast: #ffffff;--ok: #0b9b6f;--almost: #d98700;--bad: #e33f5f;--border: #b9c7ed;--decor: #7c6cff;--glow: #ff5ca8}html[data-theme=arcade]{color-scheme:dark;--bg: #080719;--surface: #15142d;--surface-2: #222044;--surface-3: #302b5c;--text: #f8f7ff;--muted: #b8b3da;--accent: #00e5ff;--accent-2: #ff3df2;--accent-contrast: #071218;--ok: #3cffac;--almost: #ffd23f;--bad: #ff5470;--border: #45406f;--decor: #00e5ff;--glow: #ff3df2;--shadow: 0 22px 65px rgb(0 229 255 / .12);--shadow-soft: 0 10px 30px rgb(255 61 242 / .12)}html[data-theme=quest]{color-scheme:dark;--bg: #112018;--surface: #1b3024;--surface-2: #294634;--surface-3: #3a5e46;--text: #fff8df;--muted: #ced7bd;--accent: #f2b84b;--accent-2: #65d69a;--accent-contrast: #2d2108;--ok: #76e3a8;--almost: #ffd166;--bad: #ff786f;--border: #52705a;--decor: #65d69a;--glow: #f2b84b;--shadow: 0 22px 60px rgb(0 0 0 / .28);--shadow-soft: 0 10px 28px rgb(0 0 0 / .2)}*{box-sizing:border-box}html{min-height:100%;background:var(--bg);color:var(--text);font-family:var(--font)}body{min-height:100vh;margin:0;background:radial-gradient(circle at 12% 8%,color-mix(in srgb,var(--decor) 24%,transparent),transparent 28rem),radial-gradient(circle at 90% 18%,color-mix(in srgb,var(--glow) 18%,transparent),transparent 24rem),linear-gradient(145deg,var(--bg),color-mix(in srgb,var(--surface-2) 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small{display:block;max-width:150px;margin-top:5px;color:var(--muted);font-size:.7rem;line-height:1.2}.brand-mark,.avatar{display:inline-grid;min-width:48px;min-height:48px;place-items:center;border-radius:16px;background:var(--surface);box-shadow:var(--shadow)}.brand-mark{color:var(--accent-contrast);background:linear-gradient(135deg,var(--accent),var(--accent-2));transform:rotate(-4deg)}.side-nav{position:fixed;inset:max(18px,env(safe-area-inset-top)) auto max(18px,env(safe-area-inset-bottom)) max(18px,env(safe-area-inset-left));z-index:30;display:flex;width:228px;flex-direction:column;gap:28px;border:1px solid color-mix(in srgb,var(--border) 78%,transparent);border-radius:30px;background:color-mix(in srgb,var(--surface) 88%,transparent);box-shadow:var(--shadow);padding:18px;-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px)}.nav{display:flex;flex:1;flex-direction:column;gap:8px}.button,button{min-height:44px;border:1px solid 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a.active>span:first-child{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--accent-contrast)}.nav-footer{display:grid;gap:8px}.nav-footer button{width:100%;justify-content:flex-start;font-size:.82rem}.bottom-nav,.mobile-sound{display:none}.button.ghost,button.ghost{background:transparent}.button.danger,button.danger{border-color:var(--bad);color:var(--bad)}main{max-width:1180px;margin:0 auto}.signed-in .app-main{margin-left:max(252px,calc((100vw - 1430px)/2 + 252px));margin-right:auto}.hero,.card,.panel,.dialog-card{border:1px solid var(--border);border-radius:var(--radius);background:color-mix(in srgb,var(--surface) 94%,transparent);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.hero{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(280px,.8fr);gap:22px;padding:clamp(22px,4vw,42px);overflow:hidden}.hero h1,.page-title{margin:0 0 10px;font-family:var(--display-font);font-size:clamp(2rem,5vw,4rem);font-weight:900;line-height:.98;letter-spacing:-.055em}.lead{color:var(--muted);font-size:1.08rem}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}.card,.panel{padding:18px}.card{color:var(--text);text-decoration:none}.card h2,.card h3{margin-block:0;font-family:var(--display-font)}.eyebrow,.card-kicker{color:var(--accent);font-size:.76rem;font-weight:900;letter-spacing:.12em;text-transform:uppercase}.mission-card{border-color:color-mix(in srgb,var(--accent) 48%,var(--border));background:linear-gradient(145deg,color-mix(in srgb,var(--accent) 12%,var(--surface)),var(--surface))}.stack{display:grid;gap:14px}.row{display:flex;flex-wrap:wrap;align-items:center;gap:10px}.between{justify-content:space-between}.muted{color:var(--muted)}.pill,.status{display:inline-flex;align-items:center;gap:6px;min-height:32px;border:1px solid var(--border);border-radius:999px;padding:4px 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small{color:var(--muted);font-weight:500}.action-button{min-height:52px;padding-inline:24px}.question-nav{display:flex;flex-wrap:wrap;gap:8px}.question-nav button{min-width:48px;padding-inline:10px}.question-nav .answered{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 32%,var(--surface))}.question-nav button[aria-current=true]{box-shadow:var(--focus);border-width:2px}.question-nav .flagged{border-style:dashed;border-color:var(--almost)}.question-nav .ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 30%,var(--surface));color:var(--text)}.question-nav .almost{border-color:var(--almost);background:color-mix(in srgb,var(--almost) 34%,var(--surface));color:var(--text)}.question-nav .bad{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 30%,var(--surface));color:var(--text)}.feedback{animation:pop .24s ease-out;border-inline-start:8px solid currentColor}.skeleton{min-height:96px;border-radius:var(--radius);background:linear-gradient(90deg,transparent,color-mix(in srgb,var(--surface) 70%,var(--surface-2)),transparent);animation:shimmer 1.6s infinite}.offline{position:sticky;top:0;z-index:20;margin:0 auto 16px;max-width:1180px;border:1px solid var(--almost);border-radius:var(--radius-sm);background:var(--surface);padding:10px 14px}.dialog-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;display:grid;place-items:center;padding:18px;background:#00000073}.dialog-card{width:min(560px,100%);padding:22px}.study-stage{display:grid;min-height:calc(100vh - 56px);grid-template-rows:auto 1fr auto;gap:clamp(16px,3vh,28px);max-width:900px;margin:0 auto}.study-header,.study-actions{display:flex;align-items:center;justify-content:space-between;gap:14px}.study-header{border:1px solid var(--border);border-radius:22px;background:color-mix(in srgb,var(--surface) 88%,transparent);box-shadow:var(--shadow-soft);padding:12px 14px;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.study-header h1{margin:2px 0 0;font:900 clamp(1.4rem,4vw,2.3rem)/1 var(--display-font)}.study-progress{display:grid;width:min(480px,62vw);gap:7px;font-weight:800}.icon-button{width:46px;min-width:46px;padding:0;font-size:1.5rem}.flashcard{width:min(720px,100%);min-height:min(58vh,540px);margin:auto;border:0;border-radius:34px;background:transparent;padding:0;perspective:1400px;box-shadow:none}.flashcard:hover{box-shadow:none;transform:translateY(-4px) rotate(.25deg)}.flashcard-inner{position:relative;display:block;width:100%;min-height:inherit;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.2,.75,.25,1.12)}.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;gap:24px;overflow:hidden;border:2px solid color-mix(in srgb,var(--accent) 38%,var(--border));border-radius:34px;background:radial-gradient(circle at 82% 16%,color-mix(in srgb,var(--accent-2) 22%,transparent),transparent 12rem),linear-gradient(145deg,var(--surface),color-mix(in srgb,var(--surface-2) 52%,var(--surface)));box-shadow:var(--shadow);padding:clamp(30px,7vw,76px);backface-visibility:hidden}.flashcard-face:before{position:absolute;top:22px;left:22px;color:color-mix(in srgb,var(--accent) 34%,transparent);content:"✦";font-size:3rem}.flashcard-face strong{max-width:620px;font:900 clamp(2rem,6vw,4.6rem)/1.08 var(--display-font);letter-spacing:-.045em;text-align:center}.flashcard-face small{max-width:560px;color:var(--muted);font-size:1rem;line-height:1.5;text-align:center}.flashcard-back{border-color:color-mix(in srgb,var(--accent-2) 56%,var(--border));background:radial-gradient(circle at 18% 84%,color-mix(in srgb,var(--accent) 22%,transparent),transparent 14rem),linear-gradient(145deg,color-mix(in srgb,var(--accent-2) 10%,var(--surface)),var(--surface));transform:rotateY(180deg)}.study-actions{border:1px solid var(--border);border-radius:22px;background:color-mix(in srgb,var(--surface) 90%,transparent);box-shadow:var(--shadow-soft);padding:12px;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.celebration{padding:12px;color:var(--accent);font-size:clamp(2rem,8vw,4.5rem);letter-spacing:.14em;text-align:center;animation:victory .8s ease both}.test-question{display:grid;align-content:center;gap:26px;width:min(820px,100%);margin:auto;border:1px solid var(--border);border-radius:30px;background:color-mix(in srgb,var(--surface) 94%,transparent);box-shadow:var(--shadow);padding:clamp(24px,6vw,62px)}.test-question h1{margin:0;font:900 clamp(1.8rem,5vw,3.7rem)/1.08 var(--display-font);letter-spacing:-.045em}.answer-options{display:grid;gap:12px}.answer-option{display:grid;grid-template-columns:44px 1fr;align-items:center;gap:14px;min-height:64px;border:2px solid var(--border);border-radius:18px;background:var(--surface);padding:10px 16px;cursor:pointer;transition:transform .16s ease,border-color .16s ease,background .16s ease}.answer-option:hover{transform:translate(4px)}.answer-option.selected{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,var(--surface))}.answer-option input{position:absolute;opacity:0;pointer-events:none}.answer-option>span{display:grid;width:40px;height:40px;place-items:center;border-radius:12px;background:var(--surface-2);color:var(--accent)}.answer-option.selected>span{background:var(--accent);color:var(--accent-contrast)}.answer-field textarea{min-height:170px;margin-top:10px;font-size:1.12rem}.flag-active{border-color:var(--almost);background:color-mix(in srgb,var(--almost) 16%,var(--surface));color:var(--almost)}.autosave-status{color:var(--muted);font-size:.82rem}.review-stage{align-content:start}.review-card{align-self:center}.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(88px,1fr));gap:10px}.review-grid button{display:grid;gap:5px;min-height:78px;border-radius:16px}.review-grid button.answered{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,var(--surface))}.review-grid button.flagged{border-color:var(--almost);border-style:dashed}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@keyframes pop{0%{transform:scale(.98);opacity:.2}}@keyframes shimmer{0%{background-position:-20rem 0}to{background-position:20rem 0}}@keyframes victory{0%{opacity:0;transform:scale(.5) rotate(-6deg)}70%{transform:scale(1.08) rotate(2deg)}to{opacity:1;transform:scale(1) rotate(0)}}@media(max-width:900px){.public-topbar,.hero{grid-template-columns:1fr}.app-shell{padding:max(16px,env(safe-area-inset-top)) max(14px,env(safe-area-inset-right)) calc(96px + env(safe-area-inset-bottom)) max(14px,env(safe-area-inset-left))}.side-nav{display:none}.signed-in .app-main{margin:0 auto}.bottom-nav{position:fixed;right:10px;bottom:max(10px,env(safe-area-inset-bottom));left:10px;z-index:40;display:flex;justify-content:space-around;gap:4px;border:1px solid var(--border);border-radius:22px;background:color-mix(in srgb,var(--surface) 90%,transparent);box-shadow:var(--shadow);padding:8px;-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px)}.mobile-sound{position:fixed;top:max(12px,env(safe-area-inset-top));right:12px;z-index:45;display:grid;width:46px;min-width:46px;place-items:center;padding:0;border-radius:50%;box-shadow:var(--shadow-soft)}.bottom-nav a{display:grid;min-width:56px;place-items:center;gap:2px;border-radius:14px;color:var(--muted);padding:7px 5px;text-decoration:none}.bottom-nav a>span{font-size:1.15rem;font-weight:900}.bottom-nav a small{font-size:.62rem}.bottom-nav a.active{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--accent-contrast)}.study-stage{min-height:calc(100dvh - 112px)}.flashcard{min-height:min(58dvh,500px)}.study-actions{flex-wrap:wrap}.study-actions .primary{flex:1}}@media(max-width:560px){.hero{padding:24px 20px}.flashcard-face{padding:28px 20px}.flashcard-face strong{font-size:clamp(1.8rem,10vw,3rem)}.study-header .pill{font-size:.72rem}.study-progress{width:auto;flex:1}.study-actions{display:grid;grid-template-columns:1fr 1.35fr}.study-actions .ghost,.study-actions .autosave-status{grid-column:1 / -1;text-align:center}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}}