@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+JP:wght@400;500;600;700;800&display=swap');
:root{--bg:#f6f7f3;--paper:#fff;--ink:#202b25;--muted:#7d8880;--line:#e6e9e2;--green:#397a50;--green2:#e7f1e7;--lime:#c9e4a2;--orange:#f5d7a5;--blue:#e6eef8;--shadow:0 3px 0 #e6e9e2;--radius:18px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:'DM Sans','Noto Sans JP',sans-serif;font-size:14px;line-height:1.6}button,input,select,textarea{font:inherit}button{cursor:pointer}.rail{position:fixed;inset:0 auto 0 0;width:238px;background:#fff;border-right:1px solid var(--line);padding:25px 16px;display:flex;flex-direction:column;z-index:4}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-size:20px;font-weight:800;letter-spacing:-.8px;padding:0 8px 35px}.brandmark{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:var(--green);color:#fff;font-weight:800;font-size:19px}.rail nav{display:grid;gap:5px}.nav{border:0;background:transparent;color:#707b73;text-align:left;border-radius:11px;padding:12px 13px;display:flex;gap:13px;align-items:center;font-weight:600;transition:background .18s,color .18s,transform .18s}.nav span{font-size:18px;width:20px;text-align:center}.nav:hover{background:#f5f7f3;color:var(--ink)}.nav:active{transform:scale(.98)}.nav.active{background:var(--green2);color:var(--green)}.rail-bottom{margin-top:auto;border-top:1px solid var(--line);padding:17px 2px 0;display:flex;align-items:center;gap:10px}.avatar{width:35px;height:35px;border-radius:50%;display:grid;place-items:center;background:var(--lime);font-weight:800;color:#35583c}.rail-bottom b,.rail-bottom small{display:block}.rail-bottom small{color:var(--muted);font-size:11px}.iconbtn{margin-left:auto;border:0;background:transparent;font-size:22px;color:var(--muted)}.main{margin-left:238px;max-width:1500px;padding:28px clamp(22px,4vw,58px) 24px}.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px;gap:15px}.eyebrow{font-size:10px;font-weight:800;letter-spacing:2px;color:var(--green)}h1{font-size:clamp(24px,3vw,32px);letter-spacing:-1.2px;margin:5px 0 0;font-weight:800;line-height:1.3}.top-actions{display:flex;align-items:center;gap:16px}.streak{color:#707b73;white-space:nowrap}.streak:first-letter{color:#e4a94e}.primary,.secondary,.soft{border:0;border-radius:11px;padding:11px 17px;font-weight:700;transition:transform .15s,background .15s,box-shadow .15s}.primary{background:var(--green);color:#fff;box-shadow:0 3px 0 #285d3b}.primary:hover{background:#2f6d44}.primary:active,.secondary:active,.soft:active{transform:translateY(2px);box-shadow:none}.secondary{background:#fff;border:1px solid var(--line);color:var(--ink)}.soft{background:var(--green2);color:var(--green)}.grid{display:grid;gap:16px}.hero{background:#e8f0e4;border-radius:24px;padding:28px 30px;display:grid;grid-template-columns:1.35fr .65fr;align-items:center;min-height:220px;overflow:hidden;position:relative}.hero h2{font-size:clamp(25px,3vw,36px);line-height:1.35;letter-spacing:-1.1px;margin:9px 0 8px;max-width:560px}.hero p{margin:0 0 20px;color:#69796d}.hero-art{justify-self:end;display:grid;place-items:center;width:155px;height:155px;border-radius:50%;background:#d5e6ce;color:var(--green);font-size:64px;transform:rotate(-8deg);box-shadow:inset 0 0 0 14px #dfecd9}.section-head{display:flex;align-items:end;justify-content:space-between;margin:29px 0 14px;gap:10px}.section-head h2{font-size:18px;margin:0;letter-spacing:-.4px}.section-head p{margin:3px 0 0;color:var(--muted);font-size:12px}.textlink{border:0;background:transparent;color:var(--green);font-weight:700}.stats{grid-template-columns:repeat(4,minmax(0,1fr));margin-top:17px}.stat,.panel,.subject-card,.feature-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.stat{padding:17px 18px}.stat-top{display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:12px;font-weight:600}.stat-icon{width:31px;height:31px;display:grid;place-items:center;border-radius:9px;background:#f0f4ed;color:var(--green);font-size:15px}.stat strong{display:block;font-size:28px;letter-spacing:-1px;margin:10px 0 2px}.stat small{color:var(--muted);font-size:11px}.subjects{grid-template-columns:repeat(3,minmax(0,1fr))}.subject-card{padding:19px;text-align:left;transition:transform .18s,border-color .18s;min-height:150px;color:var(--ink)}.subject-card:hover,.feature-card:hover{transform:translateY(-3px);border-color:#bfd3bf}.subject-icon{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--green2);color:var(--green);font-size:19px;margin-bottom:14px}.subject-card b{display:block;font-size:15px}.subject-card small{color:var(--muted)}.two-col{grid-template-columns:1.25fr .75fr}.panel{padding:22px}.panel h3{font-size:16px;margin:0 0 6px}.muted{color:var(--muted)}.progressline{height:7px;border-radius:99px;background:#edf0eb;overflow:hidden;margin:12px 0}.progressline span{height:100%;display:block;background:var(--green);border-radius:99px;transition:width .45s ease}.feature-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.feature-card{padding:18px;transition:transform .18s,border-color .18s}.feature-card .symbol{font-size:22px;color:var(--green)}.feature-card h3{margin:10px 0 4px;font-size:15px}.feature-card p{color:var(--muted);font-size:12px;margin:0 0 14px}.formrow{display:flex;gap:10px;flex-wrap:wrap}.field{display:grid;gap:6px;margin:12px 0}.field label{font-size:12px;font-weight:700;color:#5f6b62}.field input,.field select,.field textarea,.chat-input{border:1px solid #dfe5dc;border-radius:10px;padding:11px 12px;background:#fff;color:var(--ink);width:100%;outline:none}.field input:focus,.field select:focus,.field textarea:focus{border-color:#77a982;box-shadow:0 0 0 3px #e5f1e5}.question{font-size:19px;font-weight:700;line-height:1.6;margin:15px 0}.choices{display:grid;gap:9px}.choice{background:#fff;border:1px solid var(--line);border-radius:12px;padding:13px 14px;text-align:left;display:flex;gap:12px;align-items:center}.choice:hover{border-color:#a9c9ad;background:#fbfdf9}.choice .letter{width:26px;height:26px;display:grid;place-items:center;border-radius:8px;background:#f1f4ee;color:#627366;font-weight:700}.choice.selected{border-color:var(--green);background:#eff7ef}.feedback{margin-top:14px;padding:13px;border-radius:12px;background:#f2f6ef}.pill{font-size:11px;background:#f0f4ed;color:#54725a;padding:5px 9px;border-radius:999px;font-weight:700}.table{width:100%;border-collapse:collapse}.table th,.table td{text-align:left;border-bottom:1px solid var(--line);padding:12px 8px}.table th{font-size:11px;color:var(--muted)}.ranknum{font-weight:800;color:var(--green);width:34px}.editor{width:100%;min-height:200px;background:#18251e;color:#dce9dc;border:1px solid #293a2e;border-radius:12px;padding:16px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;resize:vertical}.chatbox{height:250px;overflow:auto;background:#f8faf7;border:1px solid var(--line);border-radius:12px;padding:12px;margin:10px 0}.chatline{padding:7px 0;border-bottom:1px solid #edf0eb}.empty{padding:28px 12px;text-align:center;color:var(--muted)}footer{padding:28px 0 0;color:#98a098;font-size:11px}footer span{margin-left:10px}.modal-bg{position:fixed;inset:0;background:#1a2a1f77;backdrop-filter:blur(4px);display:grid;place-items:center;z-index:10;padding:18px;animation:fade .16s ease}.modal{width:min(430px,100%);background:#fff;border-radius:20px;padding:25px;box-shadow:0 24px 80px #1c332544;animation:rise .22s ease}.modal h2{margin:0 0 5px}.modal .close{float:right;border:0;background:transparent;font-size:22px;color:var(--muted)}#toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,20px);background:#20382a;color:white;border-radius:11px;padding:11px 17px;opacity:0;pointer-events:none;transition:.22s;z-index:20;max-width:90vw}#toast.show{opacity:1;transform:translate(-50%,0)}.mobile-nav{display:none}@keyframes fade{from{opacity:0}to{opacity:1}}@keyframes rise{from{opacity:0;transform:translateY(8px) scale(.99)}to{opacity:1;transform:none}}@media(max-width:1000px){.rail{width:205px}.main{margin-left:205px;padding:23px}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.subjects{grid-template-columns:repeat(2,minmax(0,1fr))}.feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){.rail{inset:auto 0 0;width:auto;height:66px;padding:6px 8px;background:#fff;border-right:0;border-top:1px solid var(--line)}.brand,.rail-bottom{display:none}.rail nav{display:flex;justify-content:space-around;gap:0}.nav{display:flex;flex-direction:column;gap:1px;padding:5px 4px;font-size:9px;flex:1;text-align:center;justify-content:center}.nav span{font-size:18px}.nav[data-page="community"],.nav[data-page="duel"]{display:none}.main{margin:0;padding:20px 16px 95px}.topbar{align-items:flex-start;margin-bottom:20px}.eyebrow{font-size:9px}.top-actions{gap:8px;align-items:center}.streak{font-size:10px}.primary{padding:9px 11px;font-size:12px}.hero{grid-template-columns:1fr;padding:22px;min-height:0}.hero h2{font-size:27px}.hero-art{position:absolute;right:-22px;bottom:-30px;width:105px;height:105px;font-size:40px;opacity:.35}.hero>div:first-child{position:relative;z-index:1}.stats{gap:10px}.stat{padding:13px}.stat strong{font-size:24px}.stat small{font-size:10px}.subjects{gap:10px}.subject-card{padding:14px;min-height:135px}.two-col,.feature-grid{grid-template-columns:1fr}.panel{padding:17px}.section-head{margin-top:24px}.table th,.table td{padding:9px 5px;font-size:12px}footer{padding-bottom:10px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}

/* Social pages styled to match the original StudyFood calm green/cream UI. */
.sf-social-panel{max-width:760px}.sf-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.sf-list{margin-top:14px}.sf-person{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid #e8eae3}.sf-person:last-child{border-bottom:0}.sf-avatar{width:44px;height:44px;flex:0 0 44px;border-radius:50%;background:#e6eee4;color:#3c6646;display:flex;align-items:center;justify-content:center;font-weight:700;overflow:hidden}.sf-avatar img{width:100%;height:100%;object-fit:cover}.sf-person-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}.sf-person-info small{color:#7b8177}.sf-search{display:flex;gap:8px;margin-top:12px}.sf-search input,.sf-field input,.sf-send input{min-width:0;flex:1}.sf-chat{display:grid;grid-template-columns:minmax(210px,.8fr) minmax(0,1.5fr);gap:16px}.sf-chat-list{display:flex;flex-direction:column;gap:6px}.sf-chat-choice{border:0;text-align:left;border-radius:10px;padding:11px;background:#f5f6f1;color:#30362f;cursor:pointer}.sf-chat-choice:hover{background:#e8eee3}.sf-group-title{margin-top:14px}.sf-field{display:flex;flex-direction:column;gap:8px;margin-top:18px}.sf-field label{font-size:13px;color:#73796e}.sf-chat-head{font-weight:700;padding-bottom:12px;border-bottom:1px solid #e8eae3}.sf-messages{height:300px;overflow:auto;display:flex;flex-direction:column;gap:10px;padding:14px 0}.sf-message{max-width:85%;padding:10px 12px;border-radius:12px;background:#f2f4ee;align-self:flex-start;overflow-wrap:anywhere}.sf-message.mine{background:#e1edde;align-self:flex-end}.sf-message p{margin:5px 0}.sf-message small{font-size:11px;color:#7c8178}.sf-send{display:flex;gap:8px}.sf-send input{width:0}.sf-social-panel .sf-person{border:0}.sf-social-panel .sf-person h2{margin:0 0 5px}.sf-social-panel label,#sfProfileForm label,#sfReportForm label{display:block;margin:12px 0 6px;font-size:13px;color:#70766c}.sf-social-panel input,#sfProfileForm input,#sfReportForm input,#sfReportForm select,#sfReportForm textarea{width:100%;box-sizing:border-box;margin-bottom:8px}.sf-social-panel #sfProfileForm button,#sfReportForm button{margin-top:12px}.sf-social-panel .muted{color:#777d73}@media(max-width:760px){.sf-grid,.sf-chat{grid-template-columns:1fr}.sf-messages{height:260px}.sf-search{flex-wrap:wrap}}

/* Responsive navigation: keep the classic StudyFood UI, use a top-left drawer on phones. */
.topbar-heading{display:flex;align-items:center;gap:12px;min-width:0}
.menu-toggle{display:none;width:42px;height:42px;flex:0 0 42px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);font-size:22px;line-height:1;align-items:center;justify-content:center;box-shadow:var(--shadow)}
.drawer-backdrop{display:none}
@media(max-width:700px){
  .rail{inset:0 auto 0 0;width:min(290px,84vw);height:100dvh;padding:22px 15px;transform:translateX(-105%);transition:transform .22s ease;z-index:31;overflow-y:auto;border-top:0;border-right:1px solid var(--line);box-shadow:none}
  .rail .brand{display:flex;padding:0 8px 26px}
  .rail .rail-bottom{display:flex;margin-top:auto}
  .rail nav{display:grid;gap:4px}
  .rail .nav{display:flex;flex-direction:row;justify-content:flex-start;gap:13px;padding:12px 13px;font-size:13px;text-align:left}
  .rail .nav span{font-size:18px}
  .rail .nav[data-page="community"],.rail .nav[data-page="duel"]{display:flex}
  body.menu-open .rail{transform:translateX(0)}
  .drawer-backdrop{display:block;position:fixed;inset:0;background:#15251c80;border:0;padding:0;opacity:0;visibility:hidden;z-index:30;transition:opacity .2s,visibility .2s}
  body.menu-open .drawer-backdrop{opacity:1;visibility:visible}
  .menu-toggle{display:inline-flex}
  .main{margin:0;padding:16px 15px 24px}
  .topbar{align-items:center}
  .topbar-heading{gap:10px}
}
@media(min-width:701px){.menu-toggle{display:none}}


/* FIX2: authoritative mobile drawer rules; disable legacy bottom tab bar. */
.hamburger-lines{display:flex;flex-direction:column;gap:4px;width:20px;align-items:stretch;justify-content:center;pointer-events:none}
.hamburger-lines i{display:block;height:2px;width:20px;border-radius:2px;background:currentColor}
@media(max-width:700px){
  body .rail{position:fixed!important;inset:0 auto 0 0!important;left:0!important;right:auto!important;bottom:0!important;width:min(290px,84vw)!important;height:100vh!important;height:100dvh!important;box-sizing:border-box!important;display:flex!important;flex-direction:column!important;transform:translateX(-110%);z-index:1001!important;padding:22px 15px!important;border-top:0!important;border-right:1px solid var(--line)!important;overflow-y:auto!important;background:#fff!important}
  body .rail .brand,body .rail .rail-bottom{display:flex!important}
  body .rail .brand{padding:0 8px 26px!important}
  body .rail nav{display:grid!important;grid-template-columns:1fr!important;gap:4px!important;justify-content:initial!important}
  body .rail .nav{display:flex!important;flex-direction:row!important;justify-content:flex-start!important;gap:13px!important;padding:12px 13px!important;font-size:13px!important;flex:auto!important;text-align:left!important}
  body .rail .nav span{font-size:18px!important}
  body.menu-open .rail{transform:translateX(0)!important;box-shadow:0 0 32px #15251c30!important}
  body .drawer-backdrop{display:block!important;position:fixed!important;inset:0!important;width:100vw!important;height:100vh!important;height:100dvh!important;background:#15251c80!important;border:0!important;padding:0!important;opacity:0;visibility:hidden;z-index:1000!important;pointer-events:none!important}
  body.menu-open .drawer-backdrop{opacity:1!important;visibility:visible!important;pointer-events:auto!important}
  body .menu-toggle{display:inline-flex!important;position:relative!important;z-index:1002!important;pointer-events:auto!important;cursor:pointer!important;touch-action:manipulation!important}
  body .main{margin:0!important;padding:16px 15px 24px!important}
}

/* Dedicated subject-learning screen */
.subject-learning-head{display:flex;flex-direction:column;gap:18px;margin:0 auto 20px;max-width:850px}
.subject-learning-head>div{padding:22px 24px;border:1px solid var(--line);border-radius:14px;background:linear-gradient(135deg,#f1f8ee,#fff)}
.subject-learning-head h2{margin:8px 0;font-size:clamp(22px,3vw,30px);letter-spacing:-.8px}
.subject-learning-head .muted{margin:0}
#quizArea{max-width:850px;margin:0 auto}
#quizArea .question{font-size:clamp(19px,2.4vw,25px);line-height:1.8}
#quizArea .choice{min-height:54px}