:root{--ink: #1d3a8a;--ink-dark: #16296b;--paper: #f6f3ec;--card: #ffffff;--text: #1c1c1e;--muted: #6b7280;--line: #e3ded3;--danger: #b3261e;--danger-bg: #fdecec;--ok: #1a7f4b;--ok-bg: #e6f4ec;--warn: #8a5a00;--warn-bg: #fbf1dc;--highlight: #fff3b0;--radius: 16px;--tap: 48px;--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 6px 20px rgba(0, 0, 0, .05);--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--paper);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:17px;line-height:1.5;-webkit-font-smoothing:antialiased;-webkit-text-size-adjust:100%}button{font-family:inherit}a{color:var(--ink)}.app{max-width:640px;margin:0 auto;min-height:100%;display:flex;flex-direction:column}.appbar{position:sticky;top:0;z-index:10;background:var(--paper);padding:calc(var(--safe-top) + 12px) 16px 12px;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--line)}.appbar h1{font-size:20px;margin:0;font-weight:700;letter-spacing:-.2px}.appbar .spacer{flex:1}.appbar .brand{color:var(--ink);font-weight:800}.appbar .brand span{color:var(--text)}.back-btn{background:none;border:none;color:var(--ink);font-size:17px;padding:8px 4px;min-height:var(--tap);display:inline-flex;align-items:center;gap:4px;cursor:pointer}.content{flex:1;padding:16px;padding-bottom:calc(96px + var(--safe-bottom))}.tabbar{position:sticky;bottom:0;z-index:10;display:flex;background:var(--card);border-top:1px solid var(--line);padding-bottom:var(--safe-bottom)}.tabbar a{flex:1;text-align:center;padding:8px 0 6px;color:var(--muted);text-decoration:none;font-size:11px;min-height:var(--tap);display:flex;flex-direction:column;align-items:center;gap:2px}.tabbar a.active{color:var(--ink);font-weight:600}.tabbar a svg{width:24px;height:24px}.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:12px}.card.tappable{cursor:pointer;display:block;text-decoration:none;color:inherit;-webkit-tap-highlight-color:transparent}.card.tappable:active{transform:scale(.995)}.list-row{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:10px;text-decoration:none;color:inherit}.list-row .grow{flex:1;min-width:0}.list-row .title{font-weight:600}.list-row .subtitle{color:var(--muted);font-size:14px;margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.list-row .chevron{color:var(--muted);flex:none}.section-title{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:20px 4px 8px;font-weight:700}.section-title:first-child{margin-top:4px}.muted{color:var(--muted)}.small{font-size:14px}.center{text-align:center}.stack>*+*{margin-top:12px}.row-between{display:flex;align-items:center;justify-content:space-between;gap:12px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:var(--tap);padding:12px 18px;border-radius:12px;border:1px solid transparent;font-size:17px;font-weight:600;cursor:pointer;background:var(--card);color:var(--ink);border-color:var(--line);width:100%}.btn:active{transform:scale(.99)}.btn:disabled{opacity:.55;cursor:default}.btn-primary{background:var(--ink);color:#fff;border-color:var(--ink)}.btn-primary:active{background:var(--ink-dark)}.btn-ghost{background:transparent;border-color:transparent;color:var(--ink)}.btn-danger{background:transparent;color:var(--danger);border-color:var(--danger)}.btn-sm{min-height:40px;padding:8px 12px;font-size:15px;width:auto}.btn-row{display:flex;gap:10px}.btn-row .btn{width:auto;flex:1}.scan-btn{width:100%;min-height:132px;border-radius:22px;border:none;background:linear-gradient(135deg,var(--ink),#2b53c4);color:#fff;font-size:22px;font-weight:800;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;cursor:pointer;box-shadow:0 10px 26px #1d3a8a59}.scan-btn:active{transform:scale(.99)}.scan-btn svg{width:40px;height:40px}.scan-btn small{font-weight:500;opacity:.9;font-size:14px}label.field{display:block;margin-bottom:14px}label.field .label{font-size:14px;color:var(--muted);margin-bottom:6px;display:block;font-weight:600}input,textarea,select{width:100%;font-size:17px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--text);min-height:var(--tap)}textarea{min-height:160px;resize:vertical;line-height:1.55}input:focus,textarea:focus,select:focus{outline:2px solid var(--ink);outline-offset:1px;border-color:var(--ink)}.badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;text-transform:uppercase;letter-spacing:.03em}.badge-draft,.badge-uploading{background:#eef0f4;color:#55617a}.badge-processing{background:var(--warn-bg);color:var(--warn)}.badge-complete{background:var(--ok-bg);color:var(--ok)}.badge-failed{background:var(--danger-bg);color:var(--danger)}.banner{border-radius:12px;padding:12px 14px;margin-bottom:12px;font-size:15px}.banner-error{background:var(--danger-bg);color:var(--danger)}.banner-info{background:#eaf0ff;color:var(--ink-dark)}.banner-warn{background:var(--warn-bg);color:var(--warn)}.provenance{display:flex;align-items:center;gap:8px;font-size:13px;padding:8px 12px;border-radius:10px;margin-bottom:12px;font-weight:600}.provenance-student{background:#eef1f7;color:#38414f}.provenance-ai{background:#f0ecfb;color:#5b3fa6}.provenance svg{width:16px;height:16px;flex:none}.tabs{display:flex;gap:4px;background:#ece7dc;padding:4px;border-radius:12px;margin-bottom:16px;overflow-x:auto}.tabs button{flex:1;min-width:max-content;border:none;background:transparent;padding:9px 12px;border-radius:9px;font-size:15px;font-weight:600;color:var(--muted);cursor:pointer;min-height:40px}.tabs button.active{background:#fff;color:var(--ink);box-shadow:var(--shadow)}.page-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px}.page-thumb{position:relative;border-radius:12px;overflow:hidden;background:#ece7dc;box-shadow:var(--shadow)}.page-thumb img{display:block;width:100%;height:180px;object-fit:cover;background:#ddd}.page-thumb .page-num{position:absolute;top:8px;left:8px;background:#0009;color:#fff;font-size:12px;font-weight:700;padding:2px 8px;border-radius:999px}.page-thumb .page-actions{position:absolute;top:6px;right:6px;display:flex;gap:4px}.icon-btn{width:34px;height:34px;border-radius:999px;border:none;background:#ffffffeb;color:var(--text);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--shadow)}.icon-btn:active{transform:scale(.94)}.icon-btn svg{width:18px;height:18px}.icon-btn.danger{color:var(--danger)}.page-thumb .reorder{position:absolute;bottom:6px;left:6px;right:6px;display:flex;justify-content:space-between}.doc{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}.doc pre{white-space:pre-wrap;word-wrap:break-word;font-family:SF Mono,ui-monospace,Cascadia Code,Menlo,Consolas,monospace;font-size:15px;line-height:1.6;margin:0}.doc .unclear{background:var(--warn-bg);color:var(--warn);padding:0 3px;border-radius:4px;font-weight:600}.notes-md{font-size:16px;line-height:1.6}.notes-md h1{font-size:22px;margin:0 0 12px}.notes-md h2{font-size:19px;margin:20px 0 8px}.notes-md h3{font-size:17px;margin:16px 0 6px}.notes-md ul,.notes-md ol{padding-left:22px}.notes-md li{margin:4px 0}.notes-md p{margin:8px 0}.notes-md code{background:#eee;padding:1px 5px;border-radius:5px;font-size:14px}.flashcard{perspective:1000px;margin-bottom:12px}.flashcard-inner{position:relative;min-height:130px;transition:transform .45s;transform-style:preserve-3d;cursor:pointer}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;display:flex;flex-direction:column;justify-content:center;text-align:center}.flashcard-face .tag{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:700;margin-bottom:8px}.flashcard-back{transform:rotateY(180deg);background:#f0ecfb}.quiz-q{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:12px}.quiz-q .q{font-weight:600}.quiz-q .reveal{margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}.quiz-q .reveal .label{font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:700}.concept{background:#fff;border-radius:12px;box-shadow:var(--shadow);padding:12px 14px;margin-bottom:10px}.concept .name{font-weight:700;color:var(--ink)}.gap{background:var(--warn-bg);color:var(--warn);border-radius:10px;padding:10px 12px;margin-bottom:8px;font-size:15px}mark{background:var(--highlight);color:inherit;padding:0 2px;border-radius:3px}.spinner{width:22px;height:22px;border:3px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}.spinner.dark{border-color:#1d3a8a40;border-top-color:var(--ink)}@keyframes spin{to{transform:rotate(360deg)}}.loading-wrap{display:flex;flex-direction:column;align-items:center;gap:12px;padding:48px 0;color:var(--muted)}.empty{text-align:center;color:var(--muted);padding:40px 16px}.empty svg{width:48px;height:48px;opacity:.4;margin-bottom:12px}.progress-steps{list-style:none;padding:0;margin:16px 0 0}.progress-steps li{display:flex;align-items:center;gap:10px;padding:6px 0;color:var(--muted)}.progress-steps li.done{color:var(--ok)}.progress-steps li.active{color:var(--ink);font-weight:600}.dot{width:10px;height:10px;border-radius:50%;background:currentColor;flex:none}.fab-note{position:fixed;left:0;right:0;bottom:calc(70px + var(--safe-bottom));text-align:center;pointer-events:none}.login-wrap{max-width:380px;margin:0 auto;padding:40px 20px}.login-logo{text-align:center;margin-bottom:24px}.login-logo img{width:72px;height:72px}.login-logo h1{margin:12px 0 4px;color:var(--ink)}.action-bar{position:sticky;bottom:0;background:linear-gradient(to top,var(--paper) 70%,rgba(246,243,236,0));padding:12px 0 calc(8px + var(--safe-bottom))}.hint{font-size:13px;color:var(--muted);margin-top:6px}.divider{height:1px;background:var(--line);margin:16px 0;border:none}.sheet-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:flex-end;z-index:50;animation:fade .15s ease}.sheet{background:var(--paper);width:100%;max-width:640px;margin:0 auto;border-radius:22px 22px 0 0;padding:8px 16px calc(20px + var(--safe-bottom));max-height:86vh;overflow-y:auto;animation:slideup .22s ease}.sheet-handle{width:40px;height:5px;border-radius:999px;background:var(--line);margin:6px auto 8px}@keyframes fade{0%{opacity:0}}@keyframes slideup{0%{transform:translateY(30px)}}.camera-modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#000;display:flex;flex-direction:column}.camera-topbar{display:flex;align-items:center;padding:calc(var(--safe-top) + 10px) 14px 10px;gap:8px}.camera-topbar .grow{flex:1}.camera-textbtn{background:#ffffff24;color:#fff;border:none;border-radius:999px;padding:8px 16px;min-height:40px;font-size:15px;font-weight:600;display:inline-flex;align-items:center;gap:6px;cursor:pointer}.camera-stage{position:relative;flex:1;display:flex;align-items:center;justify-content:center;overflow:hidden}.camera-stage video{width:100%;height:100%;object-fit:contain;background:#000}.camera-flash{position:absolute;top:0;right:0;bottom:0;left:0;background:#fff;z-index:2;animation:camflash .16s ease-out}@keyframes camflash{0%{opacity:.9}to{opacity:0}}.camera-message{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:#fff;text-align:center;padding:24px}.camera-message .btn{width:auto;min-width:220px}.camera-error p{max-width:320px;margin:0;line-height:1.5}.camera-controls{padding:16px 16px calc(24px + var(--safe-bottom));background:#000}.camera-hint{color:#ffffffd9;text-align:center;font-size:14px;margin-bottom:14px}.camera-shutter-row{display:flex;align-items:center;justify-content:center;gap:40px}.camera-shutter{width:74px;height:74px;border-radius:50%;border:4px solid #fff;background:transparent;padding:4px;cursor:pointer}.camera-shutter span{display:block;width:100%;height:100%;border-radius:50%;background:#fff;transition:transform .1s}.camera-shutter:active span{transform:scale(.9)}.camera-donebtn{width:60px;height:60px;border-radius:50%;border:none;background:var(--ok);color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer}.camera-donebtn:disabled{background:#ffffff2e;color:#ffffff80;cursor:default}.hidden{display:none!important}.day-picker{display:flex;gap:6px;flex-wrap:wrap}.day-chip{flex:1;min-width:42px;min-height:44px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--muted);font-size:14px;font-weight:700;cursor:pointer}.day-chip.on{background:var(--ink);color:#fff;border-color:var(--ink)}.day-chip:active{transform:scale(.96)}.reminder{display:flex;align-items:center;gap:12px;background:var(--warn-bg);color:var(--warn);border-radius:var(--radius);padding:14px 16px;margin-bottom:10px;text-decoration:none;box-shadow:var(--shadow)}.reminder .grow{flex:1;min-width:0}.reminder .title{font-weight:700}.reminder .subtitle{font-size:13px;opacity:.85}.reminder svg{flex:none}.followup{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:12px}.followup .q{font-weight:600}.followup .why{font-size:13px;color:var(--muted);margin-top:4px}.followup .answered{margin-top:10px;padding:10px 12px;background:#eef1f7;border-radius:10px}.followup .answered .label{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:#38414f;font-weight:700}.followup textarea{min-height:84px;margin-top:10px}.chat{display:flex;flex-direction:column}.chat-scope{display:flex;align-items:center;gap:10px;margin-bottom:12px}.chat-scope .label{margin:0;white-space:nowrap}.chat-scope select{width:auto;flex:1}.chat-thread{min-height:40vh}.chat-empty{text-align:center;color:var(--muted);padding:32px 8px}.chat-empty svg{color:var(--ink);opacity:.7}.chat-empty p{max-width:300px;margin:12px auto 16px}.chat-examples{display:flex;flex-direction:column;gap:8px}.chat-chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 14px;font-size:14px;color:var(--ink);cursor:pointer;min-height:40px}.chat-turn{margin-bottom:16px}.chat-bubble{border-radius:16px;padding:12px 14px;margin-bottom:8px}.chat-q{background:var(--ink);color:#fff;margin-left:32px;border-bottom-right-radius:4px}.chat-a{background:#fff;box-shadow:var(--shadow);margin-right:12px;border-bottom-left-radius:4px}.chat-a-error{background:var(--danger-bg);color:var(--danger);box-shadow:none}.chat-answer{white-space:pre-wrap;line-height:1.55}.chat-sources{margin-top:12px;padding-top:10px;border-top:1px solid var(--line)}.chat-sources-label{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:700;margin-bottom:8px}.chat-source{display:flex;align-items:flex-start;gap:10px;padding:8px;border-radius:10px;text-decoration:none;color:inherit}.chat-source:active{background:#f2eee4}.chat-source .grow{display:flex;flex-direction:column;min-width:0}.chat-source-n{flex:none;width:22px;height:22px;border-radius:50%;background:var(--ink);color:#fff;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}.chat-source-title{font-weight:600;font-size:15px}.chat-source-meta{font-size:12px;color:var(--muted)}.chat-source-snippet{font-size:13px;color:var(--muted);margin-top:2px;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.chat-source .chevron,.chat-source>svg{color:var(--muted);flex:none;align-self:center}.chat-input{display:flex;gap:8px;align-items:center;position:sticky;bottom:0;background:var(--paper);padding:10px 0 4px}.chat-input input{flex:1}.chat-input .btn{width:52px;flex:none;height:48px}.figure{margin:0 0 12px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:12px}.figure-img{display:block;width:100%;max-height:340px;object-fit:contain;background:#fff;border-radius:8px}.figure figcaption{margin-top:8px}.figure-caption{font-weight:700;font-size:15px}.figure-desc{font-size:14px;color:var(--muted);margin-top:2px}.picker{display:flex;flex-direction:column;gap:6px;max-height:46vh;overflow-y:auto}.picker-row{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;min-height:48px;cursor:pointer;text-align:left;width:100%}.picker-row.on{border-color:var(--ink);background:#f3f6ff}.picker-row:disabled{opacity:.5;cursor:not-allowed}.picker-row .grow{display:flex;flex-direction:column;min-width:0}.picker-title{font-weight:600;font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.picker-meta{font-size:13px;color:var(--muted)}.checkbox{flex:none;width:22px;height:22px;border-radius:6px;border:2px solid var(--line);display:flex;align-items:center;justify-content:center;color:#fff}.checkbox.on{background:var(--ink);border-color:var(--ink)}.chip-row{display:flex;align-items:center;gap:8px;background:#f3f6ff;border:1px solid var(--line);border-radius:10px;padding:6px 8px 6px 12px;font-size:14px}.chip-row .grow{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.syl-date{display:flex;align-items:center;gap:8px;padding:7px 10px;border:1px solid var(--line);border-radius:10px;font-size:14px;margin-bottom:6px}.syl-date:last-child{margin-bottom:0}.syl-date .grow{flex:1;min-width:0}.syl-date.exam{background:var(--warn-bg);border-color:#ecd9ac}.syl-date-when{flex:none;color:var(--ink);font-weight:600;white-space:nowrap}.syl-kind{flex:none;font-size:11px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);background:#f3f6ff;border-radius:6px;padding:2px 6px}.syl-date.exam .syl-kind{color:var(--warn);background:#f6e9c9}.current-unit{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:12px;background:#eef3ff;border:1px solid #cfdcff;color:var(--ink)}.current-unit-label{font-size:11px;text-transform:uppercase;letter-spacing:.05em;opacity:.75}.current-unit-title{font-weight:700;font-size:15px}.current-unit-when{flex:none;font-size:12px;color:var(--muted);text-align:right;max-width:40%}.syl-unit{padding:8px 10px;border:1px solid var(--line);border-radius:10px;margin-bottom:6px;font-size:14px}.syl-unit:last-child{margin-bottom:0}.syl-unit.current{background:#eef3ff;border-color:#cfdcff}.page-thumb .thumb-btn{display:block;width:100%;padding:0;margin:0;border:none;background:none;cursor:pointer;box-shadow:none}.lightbox{position:fixed;top:0;right:0;bottom:0;left:0;z-index:120;background:#000000eb;display:flex;flex-direction:column;animation:fade .15s ease}.lightbox-topbar{display:flex;align-items:center;justify-content:space-between;padding:calc(8px + var(--safe-top, 0px)) 14px 8px;color:#fff}.lightbox-count{font-size:14px;font-weight:600;opacity:.9}.lightbox-btn{background:#ffffff1f;border:none;color:#fff;border-radius:999px;width:40px;height:40px;display:flex;align-items:center;justify-content:center;cursor:pointer}.lightbox-stage{position:relative;flex:1;display:flex;align-items:center;justify-content:center;min-height:0;padding:0 8px}.lightbox-stage img{max-width:100%;max-height:100%;object-fit:contain;border-radius:6px}.lightbox-nav{position:absolute;top:50%;transform:translateY(-50%);background:#ffffff24;border:none;color:#fff;width:46px;height:46px;border-radius:999px;display:flex;align-items:center;justify-content:center;cursor:pointer}.lightbox-nav.left{left:10px}.lightbox-nav.right{right:10px}.lightbox-caption{color:#fff;text-align:center;padding:12px 16px calc(16px + var(--safe-bottom));font-size:14px;opacity:.9}.range-picker{position:relative}.range-trigger{display:flex;align-items:center;gap:8px;width:100%;min-height:48px;padding:0 12px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink-2, inherit);font-size:16px;cursor:pointer;text-align:left}.range-trigger .grow{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.range-clear{flex:none;display:flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:999px;color:var(--muted)}.range-clear:hover{background:#eee}.range-cal{margin-top:8px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:var(--shadow);padding:10px}.range-cal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}.range-cal-title{font-weight:700;font-size:15px}.range-cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:2px}.range-dow{text-align:center;font-size:11px;color:var(--muted);padding:4px 0;font-weight:600}.range-day{aspect-ratio:1;border:none;background:none;border-radius:8px;font-size:14px;color:inherit;cursor:pointer;display:flex;align-items:center;justify-content:center}.range-day:hover{background:#eef3ff}.range-day.inrange{background:#eef3ff;border-radius:0}.range-day.endpoint{background:var(--ink);color:#fff;font-weight:700}.range-cal-foot{display:flex;justify-content:space-between;margin-top:8px}