:root{
  --cream:#FFFDE0;
  --cream-bg:#FBF8EC;
  --peach:#EFD1A8;
  --blue:#4E6DB3;
  --blue-light:#7C9CF5;
  --sea:#93B8E8;
  --navy:#2C3E5C;
  --navy-deep:#1E2C42;
  --terracotta:#D98E5C;
  --terracotta-deep:#8a4c22;
  --sage:#A9C1A0;
  --sage-deep:#3f5636;
  --brass:#C9A24B;
  --brass-deep:#5c4611;
  --warm-gray:#C7BEAF;
  --border:#E4DDC9;
  --text-muted:#786F5C;
  --white:#FFFFFF;
  --radius-sm:8px;
  --radius:12px;
  --radius-lg:20px;
  --shadow-sm:0 1px 3px rgba(44,62,92,0.06);
  --shadow-md:0 6px 20px rgba(44,62,92,0.10);
  --ease:cubic-bezier(.4,0,.2,1);
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family:'Inter','IBM Plex Mono',sans-serif;
  background:var(--cream-bg);
  color:var(--navy);
  height:100vh;
  overflow:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{font-family:'Source Serif 4',serif;font-weight:600;margin:0;letter-spacing:-0.01em;}
a{color:var(--blue);}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:4px;}

.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:11px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--text-muted);
}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.01ms !important;transition-duration:0.01ms !important;}
}

/* ================================================================
   LOGIN / AUTH SCREEN
   ================================================================ */
.auth-screen{
  position:fixed;inset:0;z-index:1000;
  background:var(--cream-bg);
  display:flex;align-items:center;justify-content:center;
  padding:24px;
}
.auth-screen[hidden]{display:none;}
.auth-card{
  width:100%;max-width:400px;
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-md);
  padding:40px 32px;
  text-align:center;
}
.auth-logo{height:56px;margin:0 auto 22px;display:block;}
.auth-headline{font-size:24px;line-height:1.3;margin-bottom:8px;}
.auth-sub{font-size:13.5px;color:var(--text-muted);line-height:1.6;margin-bottom:28px;}
.auth-sub b{color:var(--navy);font-weight:600;}
#google-signin-slot{display:flex;justify-content:center;margin-bottom:16px;min-height:44px;}
.auth-fallback-btn{
  width:100%;display:flex;align-items:center;justify-content:center;gap:10px;
  background:var(--white);border:1.5px solid var(--border);border-radius:var(--radius-sm);
  padding:11px 16px;font-size:14px;font-weight:600;color:var(--navy);
  cursor:pointer;transition:border-color .15s var(--ease),box-shadow .15s var(--ease);
}
.auth-fallback-btn[hidden]{display:none;} /* [hidden] and .auth-fallback-btn tie on
  specificity, so without this explicit override the class's display:flex wins and
  the button stays visible even while "hidden" — this line fixes that. */
.auth-fallback-btn:hover{border-color:var(--blue-light);box-shadow:var(--shadow-sm);}
.auth-note{margin-top:22px;font-size:11px;color:var(--text-muted);line-height:1.6;}

/* ================================================================
   APP SHELL
   ================================================================ */
.app{
  display:grid;
  grid-template-rows:56px 1fr;
  height:100vh;
}

.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:0 20px;background:var(--cream);
  border-bottom:1px solid var(--border);
  z-index:20;
}
.brand{display:flex;align-items:center;gap:10px;}
.hamburger{
  display:none;background:none;border:none;cursor:pointer;
  width:36px;height:36px;border-radius:8px;align-items:center;justify-content:center;
  color:var(--navy);flex-shrink:0;
}
.brand-mark {
  height: 50px; /* คงความสูงไว้ */
  width: auto;  /* ปล่อยความกว้างให้ขยายตามสัดส่วนรูป */
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0; /* ป้องกันการถูกหน้าจอบีบ */
}

/* ถ้าคุณใส่รูปด้วยแท็ก <img> ไว้ข้างใน ให้เพิ่มโค้ดนี้ด้วย */
.brand-mark img {
  height: 100%;
  width: auto;
  object-fit: contain; /* บังคับรูปให้อยู่ในกรอบโดยสัดส่วนไม่เพี้ยน */
}
.brand-name{font-size:15px;font-weight:600;font-family:'Source Serif 4',serif;}
.topbar-right{display:flex;align-items:center;gap:14px;}
/* .infra-chip (cloud run badge) removed from topbar per request — styles kept out to avoid dead CSS */

/* ----- user chip / dropdown menu (item 4) ----- */
.user-menu-wrap{position:relative;}
.user-chip{
  display:flex;align-items:center;gap:8px;
  font-size:12px;font-family:'Inter',sans-serif;
  padding:5px 10px 5px 5px;
  border:1px solid var(--border);
  border-radius:20px;
  background:var(--cream-bg);
  cursor:pointer;
  color:var(--navy);
}
.user-chip:hover{border-color:var(--sea);}
.user-chip .chevron{margin-left:2px;color:var(--text-muted);flex-shrink:0;}
.avatar{
  width:22px;height:22px;border-radius:50%;
  background:var(--blue-light);
  color:var(--white);
  display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:600;
  overflow:hidden;flex-shrink:0;
}
.avatar img{width:100%;height:100%;object-fit:cover;}
.uid{font-family:'IBM Plex Mono',monospace;color:var(--text-muted);}
.user-menu-dropdown{
  display:none;position:absolute;right:0;top:calc(100% + 8px);
  min-width:210px;background:var(--white);border:1px solid var(--border);
  border-radius:12px;box-shadow:0 14px 30px -14px rgba(30,44,66,0.28);
  padding:10px;z-index:40;
}
.user-menu-dropdown.open{display:block;}
.user-menu-email{
  font-size:11.5px;color:var(--text-muted);padding:4px 8px 10px;
  border-bottom:1px solid var(--border);margin-bottom:6px;word-break:break-all;
}
.user-menu-item{
  width:100%;display:flex;align-items:center;gap:8px;
  background:transparent;border:none;text-align:left;
  padding:8px;border-radius:8px;font-size:13px;color:var(--navy);
  cursor:pointer;font-family:'Inter',sans-serif;
}
.user-menu-item:hover{background:#FBEFE6;color:var(--terracotta-deep);}

/* ================================================================
   LAYOUT
   ================================================================ */
/* index.html no longer renders a .right-panel element — the old 3rd "260px"
   track left a dead blank column on the right, squeezing the chat off-center. */
.layout{display:grid;grid-template-columns:250px 1fr;overflow:hidden;position:relative;}
.scrim{
  display:none;position:fixed;inset:0;background:rgba(30,44,66,0.35);z-index:15;
}
.scrim.show{display:block;}

.sidebar{
  background:var(--white);border-right:1px solid var(--border);
  padding:18px 14px;overflow-y:auto;
}
.session-block{
  background:var(--cream-bg);border:1px solid var(--border);border-radius:var(--radius);
  padding:14px;margin-bottom:18px;
}
.session-block .session-id{
  font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--text-muted);margin-top:3px;
}
.btn{
  border:none;border-radius:var(--radius-sm);font-family:'Inter',sans-serif;
  font-size:13px;font-weight:600;cursor:pointer;padding:9px 14px;
  transition:opacity .15s var(--ease),transform .1s var(--ease),box-shadow .15s var(--ease);
}
.btn:hover{opacity:0.88;}
.btn:disabled{opacity:0.6;cursor:default;}
.btn-primary{background:var(--blue);color:var(--white);}
.btn-primary:hover{box-shadow:0 4px 12px rgba(78,109,179,0.3);}
.btn-ghost{background:transparent;color:var(--navy);border:1px solid var(--border);}
.btn-ghost:hover{border-color:var(--blue-light);background:var(--cream-bg);}
.btn-block{width:100%;}
.nav{margin:18px 0 8px;display:flex;flex-direction:column;gap:2px;}
.nav-item{
  display:flex;align-items:center;gap:9px;padding:10px;border-radius:var(--radius-sm);
  font-size:13px;font-weight:500;color:var(--navy);cursor:pointer;
  transition:background .12s var(--ease),color .12s var(--ease);
}
.nav-item svg{width:16px;height:16px;flex-shrink:0;}
.nav-item.active{background:var(--peach);color:var(--terracotta-deep);}
.nav-item:not(.active):hover{background:var(--cream-bg);}

.section-label{
  font-size:11px;color:var(--text-muted);
  text-transform:uppercase;letter-spacing:0.05em;
  margin:18px 0 8px 2px;
}
.doc-item{
  padding:9px 10px;border-radius:8px;
  border:1px solid transparent;
  margin-bottom:4px;cursor:pointer;
  position:relative;
}
.doc-item{padding:10px;border-radius:var(--radius-sm);border:1px solid transparent;margin-bottom:5px;cursor:pointer;transition:background .12s var(--ease),border-color .12s var(--ease);}
.doc-item:hover{background:var(--cream-bg);border-color:var(--border);}
.doc-item.active{background:#EDF1FA;border-color:var(--sea);}
.doc-item-top{display:flex;align-items:flex-start;justify-content:space-between;gap:6px;}
.doc-delete-btn{
  flex-shrink:0;width:26px;height:26px;border-radius:7px;border:none;
  background:transparent;color:var(--text-muted);cursor:pointer;
  display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .12s;
}
.doc-item:hover .doc-delete-btn,.doc-item:focus-within .doc-delete-btn{opacity:1;}
.doc-delete-btn:hover{background:#FBEAE2;color:var(--terracotta-deep);}
.doc-delete-btn svg{width:14px;height:14px;}
#document-list.locked .doc-item{opacity:0.55;pointer-events:none;}
.doc-name{font-size:12.5px;font-weight:500;word-break:break-word;}
.doc-meta{font-size:11px;color:var(--text-muted);margin-top:2px;}
.status-pill{
  display:inline-block;font-size:10px;padding:2px 8px;border-radius:20px;margin-top:5px;
  font-family:'IBM Plex Mono',monospace;font-weight:500;
}
.status-done{background:#EEF3EC;color:var(--sage-deep);}
.status-processing{background:#FBF1DE;color:var(--brass-deep);}
.status-error{background:#FBEAE2;color:var(--terracotta-deep);}

/* empty states (item 1 — no more hardcoded fake document) */
.empty-state{
  font-size:11.5px;color:var(--text-muted);line-height:1.6;
  padding:10px 4px;
}

/* ================================================================
   MAIN / CHAT
   ================================================================ */
.main{display:flex;flex-direction:column;overflow:hidden;background:var(--cream-bg);}
.view{display:none;height:100%;flex-direction:column;overflow:hidden;}
.view.active{display:flex;}

.chat-header{
  padding:16px 24px;background:var(--white);border-bottom:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;
}
.chat-header .doc-title{font-size:16px;font-weight:600;font-family:'Source Serif 4',serif;}
.chat-header .doc-sub{font-size:12px;color:var(--text-muted);margin-top:3px;}

.chat-scroll{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:16px;}
.msg-row{display:flex;gap:10px;max-width:78%;}
.msg-row.user{align-self:flex-end;flex-direction:row-reverse;}
.msg-avatar{
  width:28px;height:28px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;color:var(--white);
}
.msg-row.agent .msg-avatar{background:var(--navy);}
.msg-row.user .msg-avatar{background:var(--blue-light);}
.bubble{padding:12px 15px;border-radius:16px;font-size:14px;line-height:1.65;}
.msg-row.agent .bubble{background:var(--white);border:1px solid var(--border);border-top-left-radius:4px;box-shadow:var(--shadow-sm);}

/* Markdown rendered inside agent replies — scoped so it never leaks the
   page's own h1/h2 sizing into a chat bubble. */
.markdown-body{line-height:1.65;}
.markdown-body h1,.markdown-body h2,.markdown-body h3,.markdown-body h4{
  font-family:'Source Serif 4',serif;font-weight:600;margin:14px 0 6px;line-height:1.35;
}
.markdown-body h1:first-child,.markdown-body h2:first-child,
.markdown-body h3:first-child,.markdown-body h4:first-child{margin-top:0;}
.markdown-body h1{font-size:19px;}
.markdown-body h2{font-size:17px;}
.markdown-body h3{font-size:15px;}
.markdown-body h4{font-size:14px;color:var(--terracotta-deep);}
.markdown-body p{margin:0 0 10px;}
.markdown-body p:last-child{margin-bottom:0;}
.markdown-body ul,.markdown-body ol{margin:0 0 10px;padding-left:20px;}
.markdown-body li{margin-bottom:4px;}
.markdown-body strong{font-weight:700;color:var(--navy-deep);}
.markdown-body em{font-style:italic;}
.markdown-body code{
  background:var(--cream-bg);border:1px solid var(--border);border-radius:4px;
  padding:1px 5px;font-family:'IBM Plex Mono',monospace;font-size:0.9em;
}
.markdown-body hr{border:none;border-top:1px solid var(--border);margin:14px 0;}
.markdown-body a{color:var(--blue);text-decoration:underline;}
.msg-row.user .bubble{background:var(--blue-light);color:var(--white);border-top-right-radius:4px;}

/* markdown rendered inside agent bubbles (ผ่าน marked.js + DOMPurify ใน app.js) */
.bubble p{margin:0 0 8px;}
.bubble p:last-child{margin-bottom:0;}
.bubble h1,.bubble h2,.bubble h3{
  font-family:'Inter',sans-serif;font-size:13.5px;font-weight:700;
  margin:10px 0 6px;color:var(--navy);
}
.bubble h1:first-child,.bubble h2:first-child,.bubble h3:first-child{margin-top:0;}
.bubble ul,.bubble ol{margin:6px 0;padding-left:20px;}
.bubble li{margin-bottom:3px;}
.bubble strong{font-weight:700;}
.bubble em{font-style:italic;}
.bubble code{
  background:rgba(44,62,92,0.08);padding:1px 5px;border-radius:4px;
  font-family:'IBM Plex Mono',monospace;font-size:0.92em;
}
.bubble pre{
  background:rgba(44,62,92,0.06);padding:10px 12px;border-radius:8px;
  overflow-x:auto;margin:8px 0;
}
.bubble pre code{background:none;padding:0;}
.bubble a{color:var(--blue);}
.bubble blockquote{
  margin:8px 0;padding-left:10px;border-left:3px solid var(--border);
  color:var(--text-muted);
}

.thinking-row{display:flex;align-items:center;gap:10px;padding-left:36px;}
.thinking-chip{
  display:flex;align-items:center;gap:7px;font-size:12px;color:var(--text-muted);
  background:var(--white);border:1px solid var(--border);padding:7px 12px;border-radius:20px;
}
.thinking-tool{font-family:'IBM Plex Mono',monospace;color:var(--blue);}
.tdots span{animation:blink 1.2s infinite;opacity:0.2;}
.tdots span:nth-child(2){animation-delay:.2s;}
.tdots span:nth-child(3){animation-delay:.4s;}
@keyframes blink{0%,100%{opacity:0.2;}50%{opacity:1;}}

.citation-card{
  margin-top:10px;border-left:3px solid var(--sage);background:#F5F8F3;
  padding:10px 13px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:12.5px;
}
.citation-card .label{display:flex;align-items:center;gap:6px;font-size:11px;font-weight:600;color:var(--sage-deep);margin-bottom:4px;}
.citation-card .quote{color:var(--navy);font-style:italic;}

.memory-badge{
  margin-top:10px;display:flex;align-items:flex-start;gap:7px;
  background:#FBF3E2;border:1px solid var(--brass);padding:9px 12px;border-radius:var(--radius-sm);
  font-size:12px;color:var(--brass-deep);
}
.memory-badge svg{width:14px;height:14px;flex-shrink:0;margin-top:1px;}
.memory-badge b{font-weight:600;}

.quiz-card{
  align-self:flex-start;max-width:78%;background:var(--white);
  border:1.5px solid var(--terracotta);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-sm);
}
.quiz-head{background:var(--terracotta);color:var(--white);padding:9px 15px;font-size:12px;font-weight:600;display:flex;align-items:center;gap:7px;}
.quiz-body{padding:14px 15px 15px;}
.quiz-q{font-size:14px;margin-bottom:11px;line-height:1.6;}
.quiz-options{display:flex;flex-direction:column;gap:8px;}
.quiz-opt{
  text-align:left;border:1px solid var(--border);background:var(--cream-bg);
  padding:9px 13px;border-radius:var(--radius-sm);font-size:13px;
  cursor:pointer;transition:border-color .15s var(--ease),background .15s var(--ease);
  font-family:'Inter',sans-serif;
}
.quiz-opt:hover:not(:disabled){border-color:var(--terracotta);background:var(--white);}
.quiz-opt:disabled{cursor:default;opacity:0.7;}
.quiz-feedback{margin-top:9px;font-size:12px;color:var(--text-muted);display:none;}

.error-card{
  align-self:flex-start;max-width:78%;background:#FBEFE6;border:1px solid var(--terracotta);
  border-radius:var(--radius);padding:13px 15px;font-size:13px;display:flex;flex-direction:column;gap:8px;
}
.error-card .err-title{font-weight:600;color:var(--terracotta-deep);display:flex;align-items:center;gap:7px;}

.composer{
  border-top:1px solid var(--border);
  background:var(--white);
  padding:12px 22px;
  display:flex;gap:10px;align-items:flex-end;
}
.composer textarea{
  flex:1;border:1px solid var(--border);border-radius:18px;
  padding:10px 16px;font-size:13.5px;font-family:'Inter',sans-serif;
  outline:none;resize:none;line-height:1.5;
  max-height:140px;overflow-y:auto;
}
.composer textarea:focus{border-color:var(--blue-light);}
.icon-btn{
  width:40px;height:40px;border-radius:50%;border:none;background:var(--blue);color:var(--white);
  display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;
  transition:transform .1s var(--ease),box-shadow .15s var(--ease);
}
.icon-btn:hover{box-shadow:0 4px 12px rgba(78,109,179,0.35);}
.icon-btn:active{transform:scale(0.93);}
.icon-btn.ghost{background:var(--cream-bg);color:var(--navy);border:1px solid var(--border);}
.icon-btn.ghost:hover{border-color:var(--blue-light);}

/* ===== UPLOAD VIEW ===== */
.upload-wrap{padding:36px;max-width:640px;margin:0 auto;width:100%;overflow-y:auto;height:100%;}
.dropzone{
  border:2px dashed var(--sea);
  border-radius:16px;background:var(--white);
  padding:44px 24px;text-align:center;
  cursor:pointer;transition:border-color .15s, background .15s;
}
.dropzone.dragover{border-color:var(--blue);background:#EEF2FC;}
.dropzone svg{width:38px;height:38px;color:var(--blue);margin-bottom:10px;}
.dropzone .dz-title{font-size:14.5px;font-weight:600;}
.dropzone .dz-sub{font-size:12px;color:var(--text-muted);margin-top:6px;}

/* dynamic upload item list (item 3 — replaces alert() popups) */
#upload-list{display:flex;flex-direction:column;gap:10px;margin-top:14px;}
.upload-item{
  background:var(--white);border:1px solid var(--border);
  border-radius:10px;padding:12px 14px;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.upload-filename{font-size:13px;font-weight:500;word-break:break-word;}
.upload-step{font-size:11.5px;color:var(--text-muted);margin-top:2px;}
.progress-track{
  height:5px;background:var(--border);border-radius:4px;overflow:hidden;margin-top:7px;
}
.progress-fill{height:100%;background:var(--blue-light);border-radius:4px;transition:width .3s ease;}
.upload-item:has(.status-error) .progress-fill{background:var(--terracotta);}
.upload-item:has(.status-done) .progress-fill{background:var(--sage-deep);}

/* ================================================================
   PROGRESS VIEW
   ================================================================ */
.progress-wrap{padding:32px 36px;overflow-y:auto;}
.clause-row{margin-bottom:18px;}
.clause-row .clause-top{display:flex;justify-content:space-between;font-size:13px;margin-bottom:7px;}
.bar-track{height:8px;border-radius:6px;background:var(--border);overflow:hidden;}
.bar-fill{height:100%;border-radius:6px;transition:width .4s var(--ease);}

.progress-doc-row{
  border:1px solid var(--border);border-radius:12px;margin-bottom:10px;
  background:var(--white);overflow:hidden;cursor:pointer;
}
.progress-doc-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:13px 16px;font-size:13.5px;font-weight:500;
}
.progress-doc-score{font-size:12px;color:var(--text-muted);font-family:'IBM Plex Mono',monospace;}
.progress-doc-detail{
  display:none;padding:0 16px 16px;border-top:1px solid var(--border);
}
.progress-doc-row.expanded .progress-doc-detail{display:block;padding-top:14px;}
.progress-doc-row.expanded{border-color:var(--sea);}

/* ----- quiz-taking flow inside Progress (item 1) ----- */
.progress-score-line{display:flex;align-items:baseline;gap:10px;margin-bottom:14px;}
.progress-score-percent{font-size:22px;font-weight:700;font-family:'Source Serif 4',serif;color:var(--navy);}
.progress-score-detail{font-size:12px;color:var(--text-muted);}
.progress-quiz-block{margin-top:16px;padding-top:16px;border-top:1px dashed var(--border);}
.progress-review-block{margin-top:16px;padding-top:16px;border-top:1px dashed var(--border);}
.quiz-generate-btn{width:100%;}

.review-result{
  margin-top:12px;font-size:13px;line-height:1.6;color:var(--navy);
  background:#FBF3E2;border:1px solid var(--brass);border-radius:var(--radius-sm);
  padding:12px 14px;
}
.review-label{
  font-family:'IBM Plex Mono',monospace;font-size:10.5px;text-transform:uppercase;
  letter-spacing:0.05em;color:var(--brass-deep);margin-bottom:6px;
}
.review-result p{margin:0 0 8px;}
.review-result p:last-child{margin-bottom:0;}

/* .quiz-card is normally a chat bubble (narrow, align-self:flex-start) — this
   modifier lets the same component sit full-width inside the Progress panel. */
.quiz-card.quiz-standalone{max-width:100%;align-self:stretch;margin-top:12px;}
.quiz-question-block{margin-bottom:18px;padding-bottom:18px;border-bottom:1px solid var(--border);}
.quiz-question-block:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none;}
.quiz-opt.correct{background:#EEF3EC;border-color:var(--sage);}
.quiz-opt.wrong{background:#F8E9E2;border-color:var(--terracotta);}
.quiz-complete-note{
  margin-top:12px;font-size:12.5px;color:var(--sage-deep);
  background:#EEF3EC;border:1px solid var(--sage);border-radius:var(--radius-sm);
  padding:9px 12px;
}

/* ----- chat bubble: markdown tables + task lists (item 3) ----- */
.bubble{overflow-wrap:break-word;}
.bubble.bubble-plain{white-space:pre-wrap;} /* fallback if the marked/DOMPurify CDN fails to load */
.bubble table{width:100%;border-collapse:collapse;margin:10px 0;font-size:12.5px;}
.bubble th,.bubble td{border:1px solid var(--border);padding:6px 9px;text-align:left;}
.bubble th{background:var(--cream-bg);font-weight:600;}
.bubble tr:nth-child(even) td{background:rgba(44,62,92,0.03);}
.bubble input[type="checkbox"]{margin-right:6px;}

/* ===== RIGHT PANEL ===== */
.right-panel{
  background:var(--white);border-left:1px solid var(--border);padding:20px 16px;
  overflow-y:auto;display:flex;flex-direction:column;
}
.mem-item{
  background:var(--cream-bg);border:1px solid var(--border);border-radius:var(--radius);
  padding:11px 12px;margin-bottom:10px;font-size:12px;line-height:1.55;
}

/* ===== QUIZ PANEL (right sidebar) ===== */
.quiz-generate-btn{width:100%;margin-bottom:12px;}
.quiz-q-panel{font-size:12.5px;margin-bottom:10px;line-height:1.55;}
.quiz-opt-panel{
  display:block;width:100%;text-align:left;
  border:1px solid var(--border);background:var(--cream-bg);
  padding:7px 10px;border-radius:8px;font-size:12px;margin-bottom:6px;
  cursor:pointer;font-family:'Inter',sans-serif;
}
.quiz-opt-panel:hover{border-color:var(--terracotta);}
.quiz-opt-panel.correct{background:#EEF3EC;border-color:var(--sage);}
.quiz-opt-panel.wrong{background:#F8E9E2;border-color:var(--terracotta);}
.stack-strip{
  margin-top:auto;font-family:'IBM Plex Mono',monospace;font-size:10px;color:var(--text-muted);
  padding:14px 4px 2px;border-top:1px dashed var(--border);
}

/* ===== HISTORY MODAL (item 2) ===== */
.modal-overlay{
  display:none;position:fixed;inset:0;background:rgba(30,44,66,0.35);
  align-items:center;justify-content:center;z-index:100;
}
.modal-overlay.open{display:flex;}
.modal-panel{
  width:420px;max-width:90vw;max-height:74vh;
  background:var(--white);border-radius:14px;border:1px solid var(--border);
  display:flex;flex-direction:column;overflow:hidden;
  box-shadow:0 24px 50px -20px rgba(30,44,66,0.35);
}
.modal-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 16px;border-bottom:1px solid var(--border);
  font-size:14px;font-weight:600;font-family:'Source Serif 4',serif;
}
.modal-body{overflow-y:auto;padding:10px 10px 14px;flex:1;}
.history-item{
  width:100%;text-align:left;background:var(--cream-bg);
  border:1px solid var(--border);border-radius:10px;
  padding:10px 12px;margin-bottom:8px;cursor:pointer;
  font-family:'Inter',sans-serif;
}
.history-item{position:relative;display:block;}
.history-item:hover{border-color:var(--sea);background:#EDF1FA;}
.history-item-title{font-size:13px;font-weight:500;color:var(--navy);padding-right:56px;}
.history-item-meta{font-size:11px;color:var(--text-muted);margin-top:3px;font-family:'IBM Plex Mono',monospace;}
.history-item-actions{position:absolute;top:8px;right:8px;display:flex;gap:4px;}
.history-action-btn{
  width:28px;height:28px;border-radius:7px;border:none;background:var(--white);
  color:var(--text-muted);display:flex;align-items:center;justify-content:center;
  cursor:pointer;border:1px solid var(--border);
}
.history-action-btn:hover{color:var(--terracotta-deep);border-color:var(--terracotta);}
.history-action-btn svg{width:13px;height:13px;}

::-webkit-scrollbar{width:8px;}
::-webkit-scrollbar-thumb{background:var(--warm-gray);border-radius:8px;}

/* ================================================================
   RESPONSIVE — mobile-first behavior via drawer sidebars
   ================================================================ */
@media (max-width: 1000px){
  .layout{grid-template-columns:0 1fr 0;}
  .hamburger{display:flex;}
  .sidebar,.right-panel{
    position:fixed;top:56px;bottom:0;width:270px;z-index:20;
    transform:translateX(-110%);transition:transform .22s var(--ease);
  }
  .sidebar.open{transform:translateX(0);box-shadow:var(--shadow-md);}
  .right-panel{left:auto;right:0;transform:translateX(110%);}
  .right-panel.open{transform:translateX(0);box-shadow:var(--shadow-md);}
  .infra-chip{display:none;}
}
@media (max-width: 560px){
  .chat-scroll,.upload-wrap,.progress-wrap{padding-left:16px;padding-right:16px;}
  .composer{padding:12px 14px;}
  .msg-row,.quiz-card{max-width:90%;}
  .user-chip span:not(.uid){display:none;}
  .auth-card{padding:32px 22px;}
}

/* ===== MEMORY-RECALL INDICATOR (Day 6 polish: "agent remembers you") =====
   Only rendered when get_document_metadata actually found a prior weak
   spot for this topic — see extractMemorySignal in server.js. Reuses the
   same amber/brass tone as .review-result so it reads as "the same kind
   of insight" rather than a clashing new color. */
.memory-badge{
  margin-top:10px;display:flex;align-items:flex-start;gap:7px;
  background:#FBF3E2;border:1px solid var(--brass);padding:9px 12px;
  border-radius:var(--radius-sm);font-size:12px;color:var(--brass-deep);
}
.memory-badge svg{width:14px;height:14px;flex-shrink:0;margin-top:1px;color:var(--brass-deep);}
.memory-badge b{font-weight:600;}