:root{--bg:#0b0d10;--panel:#11151a;--panel2:#171c22;--ink:#f5f2ea;--muted:#9199a4;--line:#262c34;--accent:#b8ff3d;--accent2:#d7ff96;--danger:#ff6d72;--warn:#ffc65c;--good:#7af2b1;--radius:22px;--safe-b:env(safe-area-inset-bottom,0px)}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}body{min-height:100vh}button,input,textarea{font:inherit}button{color:inherit}.hidden{display:none!important}.shell{max-width:760px;margin:0 auto;padding:0 18px calc(88px + var(--safe-b))}.topbar{height:72px;display:flex;align-items:center;justify-content:space-between}.brand-lockup{display:flex;align-items:center;gap:10px}.brand-mark{display:inline-flex;align-items:center;justify-content:center;background:var(--accent);color:#0b0d10;font-weight:900;letter-spacing:-.04em;border-radius:10px;padding:6px 8px;font-size:15px}.brand-mark.small{width:max-content;margin-bottom:18px}.brand-word{font-size:13px;color:var(--muted);letter-spacing:.02em}.icon-btn,.back-btn{border:1px solid var(--line);background:var(--panel);border-radius:14px;min-width:42px;height:42px;padding:0 12px;font-size:24px;display:grid;place-items:center}.panel{display:none}.panel.active{display:block}.countdown-card{display:flex;align-items:end;justify-content:space-between;border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:linear-gradient(145deg,#151a20,#0f1216);margin-top:8px}.countdown-number{font-size:68px;line-height:.86;font-weight:900;letter-spacing:-.07em}.countdown-unit{margin-left:8px;color:var(--muted);font-size:15px}.countdown-copy{display:flex;flex-direction:column;align-items:flex-end;gap:3px}.countdown-copy strong{font-size:18px}.countdown-copy span{font-size:13px;color:var(--muted)}.mission-card{margin-top:16px;background:var(--ink);color:#0d1014;padding:22px;border-radius:var(--radius)}.mission-card .muted{color:#5f6670}.section-kicker{text-transform:uppercase;font-size:11px;letter-spacing:.12em;font-weight:800;color:#7a838e}.mission-card h2,.panel h2{margin:8px 0 6px;font-size:26px;letter-spacing:-.035em}.muted{color:var(--muted)}.goal-row{display:flex;align-items:center;gap:12px;margin-top:18px;font-size:12px;font-weight:700}.goal-track{height:9px;background:#d9d5cd;border-radius:20px;overflow:hidden;flex:1}.goal-fill{height:100%;background:#0b0d10;width:0%;transition:width .35s ease;border-radius:20px}.quick-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}.action-card{border:1px solid var(--line);background:var(--panel);border-radius:18px;padding:16px;display:flex;align-items:center;text-align:left;gap:12px;min-height:86px}.action-card.hero{grid-column:1/-1;background:var(--accent);color:#0b0d10;border-color:transparent}.action-icon{width:38px;height:38px;flex:0 0 38px;border-radius:12px;display:grid;place-items:center;background:rgba(255,255,255,.06);font-weight:900}.hero .action-icon{background:rgba(0,0,0,.1)}.action-card strong{display:block;font-size:16px;letter-spacing:-.01em}.action-card small{display:block;margin-top:3px;color:var(--muted);font-size:11px;line-height:1.3}.hero small{color:#3d4b26}.stats-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px}.stats-strip>div{border:1px solid var(--line);border-radius:16px;padding:14px;background:var(--panel);text-align:center}.stats-strip strong{display:block;font-size:20px}.stats-strip span{font-size:10px;color:var(--muted)}.section-block{margin-top:26px}.section-head{display:flex;align-items:end;justify-content:space-between}.section-head h3{font-size:20px;margin:5px 0 12px}.module-list{display:flex;flex-direction:column;gap:9px}.module-row{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:14px 15px}.module-top{display:flex;justify-content:space-between;gap:12px;font-size:13px}.module-top strong{font-size:14px}.module-top span{color:var(--muted)}.module-track{height:7px;background:#252b33;border-radius:12px;overflow:hidden;margin-top:10px}.module-fill{height:100%;background:var(--accent);border-radius:12px}.panel-head{display:flex;gap:12px;align-items:flex-start;margin:10px 0 18px}.panel-head h2{font-size:24px;margin-top:4px}.chips{display:flex;gap:7px;overflow:auto;padding-bottom:9px;scrollbar-width:none}.chips::-webkit-scrollbar{display:none}.chip{white-space:nowrap;border:1px solid var(--line);background:var(--panel);border-radius:999px;padding:8px 11px;font-size:12px;color:var(--muted)}.chip.active{background:var(--ink);color:#0b0d10;border-color:var(--ink)}.topics-list{display:flex;flex-direction:column;gap:8px}.topic-row{width:100%;display:flex;align-items:center;gap:12px;text-align:left;border:1px solid var(--line);background:var(--panel);border-radius:16px;padding:13px 14px}.topic-no{width:38px;height:38px;border-radius:12px;background:#20262e;display:grid;place-items:center;font-size:12px;font-weight:800;flex:0 0 auto}.topic-row strong{font-size:13px;line-height:1.3;display:block}.topic-row small{display:block;color:var(--muted);margin-top:3px}.status-dot{width:9px;height:9px;border-radius:50%;margin-left:auto;flex:0 0 auto;background:#3a424d}.status-dot.green{background:var(--good)}.status-dot.yellow{background:var(--warn)}.status-dot.red{background:var(--danger)}.topic-body{padding-bottom:90px}.topic-section{border:1px solid var(--line);background:var(--panel);border-radius:18px;padding:18px;margin:10px 0}.topic-section h4{margin:0 0 10px;font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--accent)}.topic-section p{font-size:14px;line-height:1.58;margin:0;white-space:pre-wrap}.topic-section ul{margin:0;padding-left:20px}.topic-section li{font-size:14px;line-height:1.5;margin:7px 0}.sticky-action{position:fixed;bottom:calc(78px + var(--safe-b));left:50%;transform:translateX(-50%);width:min(calc(100% - 36px),724px);z-index:8}.primary{border:0;background:var(--accent);color:#0b0d10;border-radius:16px;padding:14px 18px;font-weight:900}.wide{width:100%}.bottom-nav{position:fixed;z-index:10;left:50%;bottom:0;transform:translateX(-50%);width:min(100%,760px);display:grid;grid-template-columns:repeat(3,1fr);background:rgba(11,13,16,.92);backdrop-filter:blur(20px);border-top:1px solid var(--line);padding:7px 12px calc(7px + var(--safe-b))}.nav-item{border:0;background:transparent;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px}.nav-item span{font-size:20px}.nav-item small{font-size:10px}.nav-item.active{color:var(--accent)}.center-view{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card,.finish-card{width:min(100%,430px);background:var(--panel);border:1px solid var(--line);border-radius:28px;padding:26px}.login-card h1{font-size:30px;letter-spacing:-.04em;margin:32px 0 8px}.field-label{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin:24px 0 7px}.login-card input{width:100%;border:1px solid var(--line);background:#0d1014;color:var(--ink);border-radius:14px;padding:14px 15px;outline:none;margin-bottom:10px}.login-card input:focus{border-color:#53606d}.error-text{min-height:18px;color:var(--danger);font-size:12px}.session-view{position:fixed;inset:0;background:var(--bg);z-index:50;display:flex;flex-direction:column;padding-bottom:var(--safe-b)}.session-top{height:70px;display:grid;grid-template-columns:44px 1fr 44px;gap:12px;align-items:center;padding:10px 16px}.session-progress{height:7px;background:#242a31;border-radius:12px;overflow:hidden}.session-progress>div{height:100%;background:var(--accent);width:10%;transition:width .3s ease}.session-counter{font-size:11px;color:var(--muted);text-align:right}.session-content{flex:1;overflow:auto;padding:18px max(18px,calc((100vw - 720px)/2));display:flex;flex-direction:column}.card-meta{display:flex;align-items:center;gap:8px;font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.card-status{width:7px;height:7px;border-radius:50%;background:#59626d}.card-status.red{background:var(--danger)}.card-status.yellow{background:var(--warn)}.card-status.green{background:var(--good)}.prompt{font-size:30px;line-height:1.16;letter-spacing:-.04em;margin:24px 0 20px;font-weight:820}.prompt.small{font-size:24px}.think-box{border:1px dashed #353d47;border-radius:18px;padding:16px;color:var(--muted);font-size:13px;line-height:1.5}.answer-box{background:var(--ink);color:#111418;border-radius:22px;padding:20px;margin-top:16px;white-space:pre-wrap;font-size:14px;line-height:1.58}.answer-box strong{display:block;margin-bottom:5px}.hint-button{border:1px solid var(--line);background:var(--panel);border-radius:14px;padding:10px 13px;color:var(--muted);font-size:12px;margin-top:12px;width:max-content}.options{display:flex;flex-direction:column;gap:10px;margin-top:12px}.option{border:1px solid var(--line);background:var(--panel);border-radius:16px;padding:15px;text-align:left;font-size:13px;line-height:1.4}.option.correct{border-color:var(--good);background:rgba(122,242,177,.09)}.option.wrong{border-color:var(--danger);background:rgba(255,109,114,.08)}.option:disabled{opacity:1}.explanation{border-left:3px solid var(--accent);padding-left:14px;margin-top:18px;font-size:13px;line-height:1.52;color:#c8ced5}.session-footer{padding:10px max(16px,calc((100vw - 720px)/2)) calc(12px + var(--safe-b));border-top:1px solid var(--line);background:rgba(11,13,16,.95);backdrop-filter:blur(18px)}.reveal-btn,.next-btn{width:100%;border:0;border-radius:15px;padding:15px;background:var(--ink);color:#0b0d10;font-weight:900}.rating-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.rate{border:1px solid var(--line);background:var(--panel);border-radius:13px;padding:10px 5px;font-size:11px}.rate b{display:block;font-size:13px;margin-bottom:2px}.rate.again{border-color:rgba(255,109,114,.55)}.rate.easy{border-color:rgba(122,242,177,.45)}.finish-card{text-align:center}.finish-orbit{width:120px;height:120px;border:8px solid #242b31;border-top-color:var(--accent);border-radius:50%;display:grid;place-items:center;margin:4px auto 24px;transform:rotate(-20deg)}.finish-orbit span{transform:rotate(20deg);font-size:26px;font-weight:900}.finish-card h2{font-size:28px;letter-spacing:-.04em;margin:8px 0}.finish-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:22px 0}.finish-stats>div{background:#0d1014;border-radius:15px;padding:12px}.finish-stats strong{display:block}.finish-stats span{font-size:10px;color:var(--muted)}.toast{position:fixed;z-index:100;left:50%;bottom:calc(90px + var(--safe-b));transform:translate(-50%,20px);background:var(--ink);color:#0b0d10;border-radius:999px;padding:10px 14px;font-size:12px;font-weight:700;opacity:0;pointer-events:none;transition:.25s}.toast.show{opacity:1;transform:translate(-50%,0)}.modal{background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:24px;width:min(calc(100% - 36px),460px);padding:0}.modal::backdrop{background:rgba(0,0,0,.68);backdrop-filter:blur(8px)}.modal form{padding:24px}.modal h3{font-size:24px;margin:8px 0}.modal p{font-size:14px;line-height:1.55}.modal-close{float:right;border:0;background:transparent;color:var(--muted);font-size:28px}.tiny{font-size:11px!important}@media(max-width:430px){.quick-grid{grid-template-columns:1fr 1fr}.action-card{padding:14px 12px}.prompt{font-size:27px}.countdown-number{font-size:60px}.action-icon{width:34px;height:34px;flex-basis:34px}.action-card strong{font-size:14px}.action-card small{font-size:10px}}@media(min-width:700px){.quick-grid{grid-template-columns:repeat(3,1fr)}.action-card.hero{grid-column:span 2}.prompt{font-size:36px}}

.learning-card{margin-top:16px;padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
.learning-card h3{margin:9px 0;font-size:19px;letter-spacing:-.025em}
.learning-card p{margin:8px 0 16px;font-size:13px;line-height:1.5;color:var(--muted)}
.learning-totals{font-size:12px;color:var(--accent);margin-bottom:15px}
.topic-guide{margin-bottom:16px}
.lesson-progress{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.lesson-step{border:1px solid var(--line);border-radius:999px;padding:7px 10px;font-size:11px;color:var(--muted)}
.lesson-step.done{color:#0b0d10;background:var(--accent);border-color:var(--accent);font-weight:800}
.topic-actions{display:grid;gap:9px;margin:12px 0 26px}
.secondary{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:16px;padding:14px 18px;font-weight:750}
.oral-panel{padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);margin:16px 0 24px}
.oral-panel h3{font-size:22px;line-height:1.25}
.oral-panel p{font-size:13px;line-height:1.5;color:var(--muted)}
.oral-timer{font-size:36px;font-weight:850;letter-spacing:-.04em;color:var(--accent);margin:14px 0}
.oral-panel textarea{width:100%;min-height:210px;border:1px solid var(--line);border-radius:15px;background:#0d1014;color:var(--ink);padding:15px;line-height:1.5;resize:vertical;outline:none;margin-bottom:10px}
.oral-panel button{margin-top:8px}
.oral-ratings{margin-top:18px}
.search-input{width:100%;border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:14px;padding:13px 15px;margin:6px 0 16px;outline:none}
.library-block{margin:10px 0!important}
.library-block.list{padding-left:14px;border-left:2px solid var(--line)}
.library-block.callout{padding:12px;border-radius:12px;background:#202830}
.table-scroll{overflow:auto;margin:12px 0}.table-scroll table{border-collapse:collapse;min-width:100%;font-size:12px;line-height:1.45}.table-scroll td{padding:9px;border:1px solid var(--line);vertical-align:top;min-width:100px}
.bottom-nav{grid-template-columns:repeat(4,1fr)}
.topbar-actions{display:flex;gap:7px}.logout-btn{font-size:18px}
#chapterBody .topic-section{margin-bottom:12px}
.guide-panel{border-color:rgba(239,209,116,.35);background:rgba(239,209,116,.06)}
.guide-list{margin:12px 0 0;padding-left:22px;line-height:1.55}
.guide-list li+li{margin-top:9px}
.deep-inline summary{cursor:pointer;font-weight:800;line-height:1.4;padding:3px 0}
.deep-inline[open] summary{margin-bottom:14px}
.deep-inline p{line-height:1.6}
.guide-checks{display:grid;gap:9px;margin:16px 0}
.guide-checks label{display:flex;align-items:flex-start;gap:11px;padding:12px;border:1px solid var(--line);border-radius:13px;line-height:1.42;font-size:13px}
.guide-checks input{width:18px;height:18px;flex:0 0 18px;accent-color:var(--accent);margin:1px 0 0}
.quick-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.action-card{min-width:0;overflow:hidden}
.action-card>span:last-child{min-width:0}
.action-card small{overflow-wrap:anywhere}
@media(min-width:700px){.quick-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
.session-top{grid-template-columns:44px minmax(0,1fr) 52px 38px;gap:8px}
.session-timer{font-size:12px;font-weight:800;color:var(--accent);text-align:right;font-variant-numeric:tabular-nums}

/* Keep controls clear of the iPhone status bar and home indicator. */
:root{--safe-t:env(safe-area-inset-top,0px);--nav-h:68px}
.shell{padding-top:var(--safe-t);padding-bottom:24px}
#mainView{height:calc(100vh - var(--nav-h) - var(--safe-b));overflow-y:auto;overscroll-behavior-y:contain;-webkit-overflow-scrolling:touch}
@supports(height:100dvh){#mainView{height:calc(100dvh - var(--nav-h) - var(--safe-b))}}
.topbar{height:64px}
.session-view{padding-top:var(--safe-t)}
.center-view{padding-top:calc(24px + var(--safe-t));padding-bottom:calc(24px + var(--safe-b))}
.bottom-nav{height:calc(var(--nav-h) + var(--safe-b));background:#11151a;box-shadow:0 -12px 28px rgba(0,0,0,.48);padding-bottom:calc(9px + var(--safe-b))}
.nav-item{min-height:48px;touch-action:manipulation}
button,summary{touch-action:manipulation}
button{cursor:pointer}
button:disabled{cursor:default}
.primary,.secondary,.action-card,.topic-row,.icon-btn,.back-btn{min-height:48px}
.learning-hero{margin-top:8px;background:linear-gradient(145deg,#1b2616,#12191a);border-color:#3e5931}
.learning-hero h2{margin:9px 0;font-size:27px;line-height:1.16;letter-spacing:-.035em}
.learning-hero p{font-size:14px;line-height:1.56;margin:10px 0 14px;color:#cad3c7}
.learning-hero .secondary{margin-top:9px;background:transparent}
.countdown-card{margin-top:14px;padding:16px 18px}
.countdown-number{font-size:48px}
.countdown-copy strong{font-size:15px}
.countdown-copy span{font-size:12px}
.mission-card{margin-top:14px;padding:17px 18px}
.mission-card h2{font-size:20px}
.quick-grid{margin-top:14px}
.topic-body{padding-bottom:24px}
.topic-actions{margin:12px 0 18px;grid-template-columns:repeat(2,minmax(0,1fr))}
.topic-actions .primary{grid-column:1/-1}
.topic-actions .secondary{font-size:13px;line-height:1.35;padding:12px}
.topic-actions #studyTopic{grid-column:1/-1}
.topic-question{margin:16px 0;padding:14px 16px;border-left:3px solid var(--accent);background:var(--panel);border-radius:0 14px 14px 0}
.topic-question strong{font-size:11px;letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}
.topic-question p{font-size:14px;line-height:1.5;margin:8px 0 0}
.guide-panel h3{margin:0 0 8px;font-size:18px}
.guide-panel{border-color:#3e5931;background:#172019}
.guide-list li{font-size:14px;line-height:1.5;margin:10px 0}
.read-part{padding:0;overflow:hidden}
.read-part summary{min-height:54px;display:flex;align-items:center;padding:15px 18px;font-size:16px;font-weight:750;list-style:none;cursor:pointer}
.read-part summary::-webkit-details-marker{display:none}
.read-part summary::after{content:'＋';margin-left:auto;color:var(--accent);font-size:20px;font-weight:400}
.read-part[open] summary::after{content:'−'}
.read-part-body{padding:0 18px 18px}
.read-part-body p{font-size:15px;line-height:1.7;margin:0 0 12px;white-space:normal;overflow-wrap:anywhere}
.read-part-body p:last-child{margin-bottom:0}
.read-part-body a,.reading-page a{color:var(--accent2)}
.read-part-body ul{padding-left:22px}
.panel-head h2{overflow-wrap:anywhere}
.topic-row span:nth-child(2){min-width:0}
.topic-row strong{overflow-wrap:anywhere}
.reading-page{background:var(--panel);border:1px solid var(--line);border-radius:19px;padding:20px;max-width:720px;margin:10px 0 24px}
.reading-page p{font-size:16px;line-height:1.72;margin:0 0 18px;white-space:normal;overflow-wrap:anywhere}
.reading-page p:last-child{margin-bottom:0}
.reading-point{margin:0 0 22px}
.reading-point h4{font-size:14px;line-height:1.35;color:var(--accent);margin:0 0 7px}
.reading-point p{margin:0}
.reading-callout{padding:13px 15px;border-left:3px solid var(--accent);background:#20282a;border-radius:0 12px 12px 0}
.reading-page .table-scroll{margin:18px 0 24px}
.answer-parts{display:grid;gap:10px;margin:16px 0}
.answer-part{border:1px solid var(--line);background:var(--panel2);border-radius:15px;padding:15px 17px}
.answer-part h4{font-size:13px;color:var(--accent);margin:0 0 7px}
.answer-part p{font-size:14px;line-height:1.65;margin:0;white-space:pre-wrap;overflow-wrap:anywhere}
@media(max-width:360px){.topic-actions{grid-template-columns:1fr}.topic-actions .primary,.topic-actions #studyTopic{grid-column:auto}.topbar .brand-word{display:none}}
@media(display-mode:standalone){#installHelp{display:none}}