:root { --ink:#18322c; --paper:#fffdf5; --cream:#f5efdc; --sun:#f4c44d; --orange:#eb5b2a; --blue:#71a6c3; --mint:#b6d6bc; --line:#dcd1b9; --muted:#6b746a; --shadow:0 13px 0 rgba(24,50,44,.08); --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STZhongsong",SimSun,Georgia,serif; --font-mono:ui-monospace,"SF Mono","Cascadia Mono",Consolas,Menlo,monospace; --font-sans:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Nunito Sans",sans-serif; }
* { box-sizing:border-box; }
body { margin:0; color:var(--ink); background:radial-gradient(circle at 10% 10%, #f6cf62 0 3px, transparent 4px) 0 0/28px 28px, var(--cream); font-family:var(--font-sans); }
button,input,select { font:inherit; } button { cursor:pointer; }
.app-shell { width:min(100%, 560px); margin:0 auto; background:var(--paper); min-height:100vh; box-shadow:0 0 50px rgba(24,50,44,.1); }
.topbar { height:72px; padding:15px 21px; display:flex; align-items:center; justify-content:space-between; border-bottom:1px solid var(--line); background:rgba(255,253,245,.92); position:sticky; top:0; z-index:5; backdrop-filter:blur(12px); }
.brand { color:var(--ink); text-decoration:none; display:flex; gap:9px; align-items:center; font:900 22px var(--font-serif); letter-spacing:-1px; }.brand-mark { display:grid; place-items:center; width:37px; height:37px; color:var(--paper); border-radius:50% 50% 48% 52%; background:var(--orange); font:700 15px var(--font-mono); transform:rotate(-7deg); }
.topbar-actions { display:flex; gap:8px; }
.icon-button { background:var(--sun); border:1.5px solid var(--ink); border-radius:12px; color:var(--ink); width:41px;height:41px;font-size:24px;line-height:1;box-shadow:3px 3px 0 var(--ink); }.icon-button:active { transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink); }
main { padding:0 20px 42px; }.hero { padding:42px 1px 25px; }.eyebrow { font:500 10px var(--font-mono); letter-spacing:1.25px; color:var(--orange); margin:0 0 9px; }.hero h1,.section-heading h2 { font-family:var(--font-serif); letter-spacing:-1.8px; margin:0; }.hero h1 { font-size:36px;line-height:1.25; }.hero h1 em { color:var(--orange);font-style:normal; }.hero-copy { font-size:14px;line-height:1.75; color:var(--muted);margin:13px 0 18px;max-width:400px; }
.today-card { background:var(--ink);color:#fffcef;border-radius:17px;padding:17px 18px;box-shadow:var(--shadow);position:relative;overflow:hidden; }.today-card::after { content:"A";position:absolute;right:8px;bottom:-27px;font:900 110px var(--font-serif);color:rgba(244,196,77,.18); }.today-card p { margin:0;color:#d6e2d3;font-size:12px; }.today-card strong {display:block;font:600 20px var(--font-serif);margin:4px 0;}.today-card span { display:inline-block;background:var(--sun);color:var(--ink);padding:3px 9px;border-radius:30px;font-size:11px;font-weight:800; }
.quick-nav { display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:0 -2px 39px; }.quick-nav button { text-align:left;min-height:68px;padding:11px;background:var(--paper);border:1.5px solid var(--line);border-radius:13px;color:var(--ink);font-weight:800;font-size:13px;transition:.18s; }.quick-nav button:hover {border-color:var(--ink);background:var(--sun);transform:translateY(-2px);}.quick-nav span {display:block;font:10px var(--font-mono);color:var(--orange);margin-bottom:4px;}
.view { display:none;animation:slide .3s ease; }.view.active {display:block;}@keyframes slide {from {opacity:0;transform:translateY(8px)} to {opacity:1;transform:none}}.section-heading {border-top:2px solid var(--ink);padding-top:18px;margin-bottom:17px;}.section-heading h2 {font-size:27px;}.progress-summary { background:var(--sun);border:1.5px solid var(--ink);border-radius:15px;padding:15px;margin-bottom:14px;box-shadow:4px 4px 0 var(--ink);}.progress-summary strong {font-size:30px;}.progress-summary p {margin:4px 0 9px;font-size:13px;}.meter {height:10px;background:#fff5c9;border:1px solid var(--ink);border-radius:9px;overflow:hidden;}.meter span {display:block;height:100%;background:var(--orange);transition:width .4s;}
.unit-list {display:grid;gap:9px;}.unit {display:flex;align-items:center;gap:11px;padding:13px;border:1px solid var(--line);border-radius:13px;background:#fffefa;}.unit input {width:20px;height:20px;accent-color:var(--orange);}.unit.done {background:#eff6ec;border-color:var(--mint);}.unit-main {flex:1;}.unit-main strong {display:block;font-size:14px;}.unit-main small {color:var(--muted);font-size:12px;}.unit-tag {font:10px var(--font-mono);padding:4px 6px;background:var(--cream);border-radius:5px;}
.paper-form {display:grid;grid-template-columns:1fr 1fr;gap:11px;padding:16px;background:#fffdf7;border:1px solid var(--line);border-radius:16px;box-shadow:0 7px 0 rgba(24,50,44,.06);}.paper-form label {font-size:12px;font-weight:800;color:var(--muted);}.paper-form .full {grid-column:1/-1;}.paper-form input,.paper-form select {width:100%;margin-top:5px;padding:10px;border-radius:9px;border:1px solid var(--line);background:#fff;font-size:14px;color:var(--ink);outline-color:var(--orange);}.primary {grid-column:1/-1;background:var(--orange);color:white;border:1.5px solid var(--ink);border-radius:11px;padding:12px 15px;text-align:left;font-weight:800;box-shadow:3px 3px 0 var(--ink);}.primary span {float:right;font-size:20px;line-height:12px;}.primary:active {transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink);}
.lesson-output,.analysis-card,.recent-records {margin-top:16px;}.lesson-card {border-left:5px solid var(--blue);background:#edf6f8;border-radius:0 14px 14px 0;padding:16px;}.lesson-card h3 {font-family:var(--font-serif);font-size:19px;margin:0 0 7px;}.lesson-card p {font-size:13px;line-height:1.65;margin:4px 0;color:#425850;}.lesson-steps {list-style:none;padding:0;margin:13px 0 0;display:grid;gap:8px;}.lesson-steps li {display:grid;grid-template-columns:37px 1fr;gap:9px;font-size:13px;line-height:1.5;}.minute {font:11px var(--font-mono);color:var(--orange);padding-top:2px;}
.scan-intro {display:flex;gap:10px;align-items:flex-start;background:#edf6f8;border-radius:13px;padding:12px 14px;margin:-4px 0 14px;}.scan-intro span {font-size:25px;color:var(--blue);line-height:1;}.scan-intro p {margin:0;font-size:12px;line-height:1.6;color:#405d64;}.scan-form {margin-bottom:14px;}.camera-card {border:1.5px solid var(--ink);border-radius:17px;padding:11px;background:var(--ink);box-shadow:4px 4px 0 var(--sun);}.camera-frame {aspect-ratio:4 / 3;position:relative;overflow:hidden;border-radius:10px;background:#263d36;display:grid;place-items:center;}.camera-frame video,.camera-frame img {display:none;width:100%;height:100%;object-fit:cover;}.camera-frame.camera-on video,.camera-frame.has-photo img {display:block;}.camera-placeholder {color:#e9eadc;text-align:center;display:grid;gap:5px;}.camera-placeholder span {font:40px var(--font-serif);color:var(--sun);}.camera-placeholder strong {font:600 15px var(--font-serif);}.camera-placeholder small {font-size:11px;color:#c4d0c5;}.camera-frame.camera-on .camera-placeholder,.camera-frame.has-photo .camera-placeholder {display:none;}.camera-controls {display:grid;grid-template-columns:1fr auto auto;gap:8px;margin-top:10px;}.photo-picker,.secondary,.outline-button {border:1px solid rgba(255,253,245,.55);border-radius:9px;background:transparent;color:#fffdf5;padding:9px 10px;font-size:12px;font-weight:800;text-align:center;}.photo-picker input {position:absolute;inline-size:1px;block-size:1px;opacity:0;}.secondary {color:var(--ink);background:var(--mint);border-color:var(--mint);}.capture {width:39px;border:2px solid #fffdf5;color:var(--orange);background:#fffdf5;border-radius:50%;font-size:24px;line-height:1;}.capture:disabled {opacity:.35;}.camera-note {margin:9px 3px 1px;color:#d6e2d3;font-size:10px;line-height:1.5;}.prompt-actions {display:grid;grid-template-columns:1fr auto;gap:8px;margin-top:16px;}.prompt-actions .primary {grid-column:auto;}.outline-button {border-color:var(--ink);color:var(--ink);background:var(--paper);}.outline-button:disabled {opacity:.5;}.prompt-box {margin-top:14px;background:#fff8e6;border:1px dashed #c8a349;border-radius:13px;padding:14px;}.prompt-box p {margin:0;color:var(--muted);font-size:12px;line-height:1.65;}.prompt-box textarea {width:100%;min-height:265px;resize:vertical;border:0;background:transparent;color:var(--ink);font:12px/1.6 var(--font-mono);outline:none;}.copy-prompt {display:block;width:100%;margin-top:10px;border:1px solid var(--ink);border-radius:9px;padding:9px;background:var(--sun);font-size:12px;font-weight:900;color:var(--ink);}
.filter-row {display:flex;gap:7px;overflow-x:auto;padding:1px 0 8px;}.filter {white-space:nowrap;background:#fff;border:1px solid var(--line);padding:7px 10px;border-radius:30px;color:var(--muted);font-size:12px;font-weight:800;}.filter.active {background:var(--ink);border-color:var(--ink);color:#fff;}.hint {font-size:12px;line-height:1.6;color:var(--muted);margin:3px 0 13px;}.question-list {display:grid;gap:9px;}.question {width:100%;text-align:left;background:#fff;border:1px solid var(--line);border-radius:13px;padding:13px;display:grid;grid-template-columns:32px 1fr auto;gap:8px;align-items:start;color:var(--ink);}.question:hover {border-color:var(--orange);}.question.selected {background:#fff2d8;border:1.5px solid var(--orange);}.question-no {font:12px var(--font-mono);color:var(--orange);padding-top:2px;}.question strong {font-size:13px;line-height:1.55;display:block;}.question small {display:block;margin-top:5px;font-size:10px;color:var(--muted);}.question .type {font-size:10px;border-radius:5px;background:var(--mint);padding:3px 5px;}.assignment-basket {position:sticky;bottom:12px;margin-top:16px;padding:13px;background:var(--ink);color:#fffdf5;border-radius:15px;box-shadow:0 8px 20px rgba(24,50,44,.22);}.assignment-basket p {margin:0 0 9px;font-size:13px;}.assign {border:0;border-radius:8px;background:var(--sun);color:var(--ink);font-size:12px;font-weight:900;padding:8px 10px;width:100%;}.assign:disabled {opacity:.55;cursor:not-allowed;}
.analysis-card {background:#f7f0de;border:1px solid var(--line);border-radius:15px;padding:16px;min-height:70px;}.analysis-card.empty {color:var(--muted);font-size:13px;display:flex;align-items:center;}.analysis-card h3 {font-family:var(--font-serif);margin:0 0 9px;font-size:19px;}.score-line {display:flex;align-items:baseline;gap:8px;}.score-line strong {font-size:34px;color:var(--orange);}.error-tags {display:flex;gap:7px;flex-wrap:wrap;margin-top:12px;}.error-tags span {font-size:11px;padding:5px 8px;border-radius:20px;background:white;border:1px solid var(--line);}.recent-records h3 {font:700 13px var(--font-serif);margin:20px 0 8px;}.record {padding:9px 3px;border-bottom:1px dashed var(--line);display:flex;justify-content:space-between;font-size:12px;}.record small {color:var(--muted);}.toast {position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);background:var(--ink);color:white;border-radius:40px;padding:10px 15px;font-size:13px;opacity:0;pointer-events:none;transition:.25s;z-index:10;}.toast.show {opacity:1;transform:translate(-50%,0);}footer {padding:23px 25px 32px;text-align:center;border-top:1px solid var(--line);font-size:11px;line-height:1.6;color:var(--muted);}
@media (min-width:600px) {.app-shell {margin:20px auto;border-radius:22px;overflow:hidden;min-height:calc(100vh - 40px)} }