/* ── Edu Hives stylesheet ── */
:root {
  --teal:        #1a7a6e;
  --teal-d:      #145f55;
  --teal-l:      #e6f4f2;
  --teal-b:      #a8d8d3;
  --amber:       #b06c10;
  --amber-l:     #fef4e6;
  --green:       #1a6e3a;
  --green-l:     #e8f5ee;
  --green-b:     #a8d4b8;
  --red:         #991a1a;
  --red-l:       #fdf0f0;
  --red-b:       #d4a0a0;
  --ink:         #12100e;
  --ink2:        #5a5550;
  --ink3:        #9c9590;
  --paper:       #faf8f4;
  --surface:     #ffffff;
  --surface2:    #f2efe8;
  --border:      #e4dfd6;
  --border2:     #cdc8be;
  --r:           10px;
  --rl:          14px;
}

*   { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Sora', sans-serif; background: var(--paper); color: var(--ink); min-height: 100vh; font-size: 14px; }

/* ── SCREENS ── */
.screen      { display: none; min-height: 100vh; }
.screen.active { display: flex; }

/* ── LOGIN ── */
#s-login {
  align-items: center; justify-content: center;
  background: var(--paper); position: relative; overflow: hidden;
}
#s-login::before {
  content: ''; position: absolute; inset: 0;
  background: repeating-linear-gradient(45deg, transparent, transparent 40px, rgba(26,122,110,0.03) 40px, rgba(26,122,110,0.03) 41px);
  pointer-events: none;
}
.login-box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--rl); padding: 3rem 2.5rem;
  max-width: 420px; width: 100%; position: relative;
  box-shadow: 0 2px 40px rgba(18,16,14,0.08);
}
.login-logo    { font-family: 'Fraunces', serif; font-size: 32px; color: var(--teal); margin-bottom: 4px; font-weight: 300; font-style: italic; }
.login-tagline { font-size: 12px; color: var(--ink3); margin-bottom: 2rem; letter-spacing: 0.04em; }
.login-box h2  { font-size: 18px; font-weight: 500; margin-bottom: 6px; }
.login-box p   { font-size: 13px; color: var(--ink2); margin-bottom: 1.5rem; line-height: 1.6; }
.gmail-btn {
  display: flex; align-items: center; justify-content: center; gap: 12px;
  width: 100%; padding: 12px; border-radius: var(--r);
  border: 1.5px solid var(--border2); background: var(--surface);
  font-family: 'Sora', sans-serif; font-size: 14px; font-weight: 500;
  color: var(--ink); cursor: pointer; transition: all 0.2s;
}
.gmail-btn:hover { border-color: var(--teal); background: var(--teal-l); }
.login-divider { display: flex; align-items: center; gap: 10px; margin: 1.25rem 0; }
.login-divider::before, .login-divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.login-divider span { font-size: 12px; color: var(--ink3); white-space: nowrap; }
.email-row    { display: flex; gap: 8px; }
.email-row input { flex: 1; }
.login-note   { font-size: 11px; color: var(--ink3); text-align: center; margin-top: 1.25rem; line-height: 1.6; }

/* ── ONBOARDING ── */
#s-onboard { flex-direction: column; align-items: center; justify-content: center; padding: 2rem; background: var(--paper); }
.onboard-box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--rl); padding: 2.5rem;
  max-width: 480px; width: 100%;
  box-shadow: 0 2px 24px rgba(18,16,14,0.07);
  max-height: 92vh; overflow-y: auto;
}
.ob-step { font-size: 11px; font-weight: 600; color: var(--teal); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 8px; }
.onboard-box h2 { font-family: 'Fraunces', serif; font-size: 24px; font-weight: 300; margin-bottom: 6px; }
.onboard-box p  { font-size: 13px; color: var(--ink2); margin-bottom: 1.5rem; line-height: 1.6; }
.field       { margin-bottom: 1rem; }
.field label { display: block; font-size: 12px; font-weight: 500; color: var(--ink2); margin-bottom: 5px; letter-spacing: 0.03em; }

input[type=text], input[type=email] {
  width: 100%; padding: 10px 14px; border: 1px solid var(--border2);
  border-radius: var(--r); font-family: 'Sora', sans-serif;
  font-size: 13px; color: var(--ink); background: var(--surface); outline: none;
  transition: border-color 0.15s;
}
input[type=text]:focus, input[type=email]:focus { border-color: var(--teal); }

.board-row   { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.board-btn   { padding: 9px; border-radius: var(--r); border: 1px solid var(--border); background: var(--surface); font-family: 'Sora', sans-serif; font-size: 12px; font-weight: 500; color: var(--ink2); cursor: pointer; text-align: center; transition: all 0.15s; }
.board-btn:hover { border-color: var(--teal); }
.board-btn.sel   { border-color: var(--teal); background: var(--teal-l); color: var(--teal); }
.class-grid  { display: grid; grid-template-columns: repeat(5,1fr); gap: 6px; }
.class-btn   { padding: 10px 6px; border-radius: var(--r); border: 1px solid var(--border); background: var(--surface); font-family: 'Sora', sans-serif; font-size: 13px; font-weight: 500; color: var(--ink2); cursor: pointer; text-align: center; transition: all 0.15s; }
.class-btn:hover { border-color: var(--teal); color: var(--teal); }
.class-btn.sel   { border-color: var(--teal); background: var(--teal-l); color: var(--teal); font-weight: 600; }
.subj-row    { display: flex; gap: 8px; }
.subj-btn    { flex: 1; padding: 12px 8px; border-radius: var(--r); border: 1.5px solid var(--border); background: var(--surface); font-family: 'Sora', sans-serif; font-size: 13px; font-weight: 500; color: var(--ink2); cursor: pointer; text-align: center; transition: all 0.15s; }
.subj-btn:hover { border-color: var(--teal); }
.subj-btn.sel   { border-color: var(--teal); background: var(--teal-l); color: var(--teal); font-weight: 600; }
.si          { font-size: 20px; display: block; margin-bottom: 4px; }
.action-btn  { width: 100%; padding: 12px; border-radius: var(--r); border: none; background: var(--teal); color: #fff; font-family: 'Sora', sans-serif; font-size: 14px; font-weight: 500; cursor: pointer; margin-top: 1rem; transition: all 0.15s; }
.action-btn:hover  { background: var(--teal-d); }
.action-btn:active { transform: scale(0.98); }

/* ── TOPBAR ── */
#s-app      { flex-direction: column; }
.topbar     { background: var(--surface); border-bottom: 1px solid var(--border); height: 54px; display: flex; align-items: center; justify-content: space-between; padding: 0 1.5rem; position: sticky; top: 0; z-index: 100; flex-shrink: 0; }
.topbar-left  { display: flex; align-items: center; gap: 14px; }
.tb-logo    { font-family: 'Fraunces', serif; font-size: 18px; color: var(--teal); font-weight: 300; font-style: italic; }
.tb-school  { font-size: 12px; color: var(--ink2); padding: 4px 10px; background: var(--surface2); border-radius: 20px; border: 1px solid var(--border); }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.user-chip  { display: flex; align-items: center; gap: 8px; padding: 4px 12px 4px 4px; border-radius: 20px; border: 1px solid var(--border); background: var(--surface2); }
.user-av    { width: 26px; height: 26px; border-radius: 50%; background: var(--teal-l); border: 1px solid var(--teal-b); display: flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 600; color: var(--teal); }
.user-name  { font-size: 12px; font-weight: 500; color: var(--ink); }
.tb-btn     { padding: 5px 12px; border-radius: 20px; border: 1px solid var(--border); background: transparent; font-family: 'Sora', sans-serif; font-size: 12px; color: var(--ink2); cursor: pointer; transition: background 0.15s; }
.tb-btn:hover { background: var(--surface2); }

/* ── LAYOUT ── */
.app-body   { display: grid; grid-template-columns: 268px 1fr; flex: 1; min-height: calc(100vh - 54px); }

/* ── SIDEBAR ── */
.sidebar    { background: var(--surface); border-right: 1px solid var(--border); padding: 1.25rem; display: flex; flex-direction: column; gap: 1rem; overflow-y: auto; height: 100%; box-sizing: border-box; }
.sb-label   { font-size: 10px; font-weight: 600; color: var(--ink3); letter-spacing: 0.07em; text-transform: uppercase; margin-bottom: 8px; }
.subj-tabs  { display: flex; flex-direction: column; gap: 4px; }
.subj-tab   { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: var(--r); border: 1px solid transparent; cursor: pointer; font-size: 13px; font-weight: 500; color: var(--ink2); transition: all 0.15s; }
.subj-tab:hover  { background: var(--surface2); }
.subj-tab.active { background: var(--teal-l); color: var(--teal); border-color: var(--teal-b); }
.subj-tab .si    { font-size: 15px; }
.topic-list { display: flex; flex-direction: column; gap: 4px; }
.topic-item { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: var(--r); border: 1px solid var(--border); cursor: pointer; font-size: 12px; color: var(--ink); transition: all 0.15s; background: var(--surface); }
.topic-item:hover { border-color: var(--teal); background: var(--teal-l); }
.topic-item.sel   { border-color: var(--teal); background: var(--teal-l); color: var(--teal); font-weight: 500; }
.ti-dot     { width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex-shrink: 0; }
.gen-btn    { width: 100%; padding: 10px; border-radius: var(--r); border: none; background: var(--teal); color: #fff; font-family: 'Sora', sans-serif; font-size: 13px; font-weight: 500; cursor: pointer; transition: all 0.15s; margin-top: 4px; }
.gen-btn:hover    { background: var(--teal-d); }
.gen-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.divider    { height: 1px; background: var(--border); margin: 4px 0; }

/* ── DOWNLOAD BUTTONS ── */
.dl-buttons { display: flex; flex-direction: column; gap: 5px; }
.dl-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px; border-radius: var(--r);
  border: 1px solid var(--border); background: var(--surface);
  font-family: 'Sora', sans-serif; font-size: 12px; font-weight: 500;
  color: var(--ink2); cursor: pointer; transition: all 0.15s; text-align: left;
}
.dl-btn:hover    { border-color: var(--teal); background: var(--teal-l); color: var(--teal); }
.dl-btn.dl-full  { border-color: var(--teal-b); color: var(--teal); }
.dl-btn.dl-full:hover { background: var(--teal-l); }
.dl-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.dl-icon    { font-size: 14px; }

/* ── PROGRESS ── */
.prog-box   { background: var(--surface2); border-radius: var(--r); padding: 12px; border: 1px solid var(--border); }
.prog-row   { display: flex; justify-content: space-between; font-size: 12px; color: var(--ink2); margin-bottom: 6px; }
.prog-val   { font-weight: 500; color: var(--ink); }
.prog-track { height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; }
.prog-fill  { height: 100%; background: var(--teal); border-radius: 2px; transition: width 0.4s; }
.prog-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-top: 8px; }
.ps         { text-align: center; padding: 8px; background: var(--surface); border-radius: 8px; border: 1px solid var(--border); }
.ps-v       { font-size: 18px; font-weight: 500; color: var(--ink); }
.ps-l       { font-size: 10px; color: var(--ink3); margin-top: 2px; }

/* ── MAIN ── */
.main         { padding: 1.5rem; overflow-y: auto; display: flex; flex-direction: column; gap: 1rem; }
.agent-bar    { display: flex; align-items: center; gap: 8px; padding: 9px 14px; background: var(--surface2); border-radius: var(--r); border: 1px solid var(--border); font-size: 12px; color: var(--ink2); }
.a-dot        { width: 7px; height: 7px; border-radius: 50%; background: #22c55e; flex-shrink: 0; }
.a-dot.on     { background: #f59e0b; animation: pulse 1s infinite; }
@keyframes pulse { 0%,100%{opacity:1}50%{opacity:0.2} }
.sec-nav-wrap { }
.sec-nav      { display: inline-flex; gap: 4px; padding: 4px; background: var(--surface2); border-radius: var(--r); }
.st           { padding: 7px 14px; border-radius: 8px; border: none; background: transparent; font-family: 'Sora', sans-serif; font-size: 12px; font-weight: 500; color: var(--ink2); cursor: pointer; transition: all 0.15s; }
.st.active    { background: var(--surface); color: var(--ink); box-shadow: 0 1px 4px rgba(18,16,14,0.08); }

/* ── CARDS ── */
.card        { background: var(--surface); border: 1px solid var(--border); border-radius: var(--rl); padding: 1.25rem 1.5rem; margin-bottom: .75rem; }
.card-head   { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.card-title  { font-family: 'Fraunces', serif; font-size: 16px; font-weight: 300; }
.card-body   { font-size: 13px; color: var(--ink2); line-height: 1.7; }
.badge       { display: inline-flex; padding: 3px 9px; border-radius: 20px; font-size: 11px; font-weight: 600; }
.b-teal      { background: var(--teal-l); color: var(--teal); border: 1px solid var(--teal-b); }
.b-amber     { background: var(--amber-l); color: var(--amber); }
.b-green     { background: var(--green-l); color: var(--green); border: 1px solid var(--green-b); }
.b-red       { background: var(--red-l); color: var(--red); border: 1px solid var(--red-b); }
.obj         { display: flex; gap: 8px; font-size: 12px; color: var(--ink2); margin-top: 5px; line-height: 1.5; }
.obj-ok      { color: var(--teal); }
.mat-row     { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.info-pill   { display: inline-flex; align-items: center; gap: 5px; padding: 4px 10px; border-radius: 20px; background: var(--teal-l); border: 1px solid var(--teal-b); font-size: 11px; color: var(--teal); margin-bottom: 10px; }

/* ── EXAMPLES ── */
.ex-block    { background: var(--surface2); border-radius: var(--r); padding: 1rem; margin-bottom: .75rem; border: 1px solid var(--border); }
.ex-label    { font-size: 10px; font-weight: 600; color: var(--ink3); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 8px; }
.ex-q        { font-size: 13px; font-weight: 500; color: var(--ink); margin-bottom: 10px; line-height: 1.5; }
.step        { display: flex; gap: 10px; margin-bottom: 7px; align-items: flex-start; }
.sn          { width: 22px; height: 22px; border-radius: 50%; background: var(--teal); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 10px; font-weight: 600; flex-shrink: 0; margin-top: 1px; }
.st-text     { font-size: 12px; color: var(--ink); line-height: 1.6; }
.ans-reveal  { margin-top: 10px; padding: 8px 12px; background: var(--green-l); border-radius: 8px; font-size: 12px; color: var(--green); font-weight: 500; border: 1px solid var(--green-b); }

/* ── EXERCISES ── */
.exq-card    { border: 1px solid var(--border); border-radius: var(--r); padding: 1rem; margin-bottom: .75rem; background: var(--surface); }
.exq-meta    { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.exq-label   { font-size: 10px; font-weight: 600; color: var(--ink3); text-transform: uppercase; letter-spacing: .06em; }
.exq-q       { font-size: 13px; color: var(--ink); line-height: 1.6; margin-bottom: 10px; }
textarea     { width: 100%; padding: 8px 12px; border-radius: var(--r); border: 1px solid var(--border2); background: var(--surface); font-family: 'Sora', sans-serif; font-size: 12px; color: var(--ink); resize: vertical; min-height: 60px; outline: none; transition: border-color 0.15s; }
textarea:focus { border-color: var(--teal); }
.eval-box    { margin-top: 8px; padding: 9px 12px; border-radius: 8px; font-size: 12px; line-height: 1.6; }
.ev-good     { background: var(--green-l); color: var(--green); border: 1px solid var(--green-b); }
.ev-ok       { background: var(--amber-l); color: var(--amber); }
.ev-poor     { background: var(--red-l); color: var(--red); border: 1px solid var(--red-b); }
.row-btns    { display: flex; gap: 8px; margin-top: 8px; }

/* ── BUTTONS ── */
.rbtn        { padding: 7px 14px; border-radius: 8px; border: 1px solid var(--border2); background: transparent; font-family: 'Sora', sans-serif; font-size: 12px; font-weight: 500; color: var(--ink); cursor: pointer; transition: all 0.15s; }
.rbtn:hover  { background: var(--surface2); }
.rbtn.primary { background: var(--teal); color: #fff; border-color: transparent; }
.rbtn.primary:hover { background: var(--teal-d); }

/* ── RESULTS ── */
.res-hero    { text-align: center; padding: 2rem; background: var(--surface2); border-radius: var(--rl); border: 1px solid var(--border); margin-bottom: 1rem; }
.res-grade   { font-family: 'Fraunces', serif; font-size: 64px; font-weight: 300; color: var(--teal); line-height: 1; }
.res-pct     { font-size: 15px; color: var(--ink2); margin-top: 4px; }
.res-msg     { font-size: 12px; color: var(--ink3); margin-top: 6px; font-style: italic; }
.res-grid    { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; margin-bottom: 1rem; }
.rs          { background: var(--surface2); border-radius: var(--r); padding: 12px; text-align: center; border: 1px solid var(--border); }
.rs-v        { font-family: 'Fraunces', serif; font-size: 24px; font-weight: 300; color: var(--ink); }
.rs-l        { font-size: 11px; color: var(--ink3); margin-top: 2px; }

/* ── PASTE AREA ── */
.paste-area  { margin-top: 1rem; padding: 1rem; background: var(--surface2); border-radius: var(--r); border: 1px solid var(--border); }
.paste-area p { font-size: 12px; color: var(--ink2); margin-bottom: 8px; line-height: 1.5; }
.loading-state { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 2.5rem; gap: 12px; }
.spinner     { width: 24px; height: 24px; border: 2px solid var(--border2); border-top-color: var(--teal); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── EMPTY ── */
.empty       { text-align: center; padding: 3rem 1rem; font-size: 13px; color: var(--ink3); line-height: 1.8; font-style: italic; }

/* ── TOAST ── */
.toast {
  position: fixed; bottom: 24px; right: 24px;
  padding: 10px 18px; border-radius: var(--r);
  background: var(--ink); color: #fff; font-size: 13px;
  opacity: 0; transform: translateY(10px);
  transition: all 0.25s; pointer-events: none; z-index: 999;
  box-shadow: 0 4px 20px rgba(18,16,14,0.25);
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.success { background: var(--teal); }
.toast.error   { background: var(--red); }

/* ── p-tasks loading dots ── */
.p-tasks { display:flex;flex-direction:column;gap:7px; }
.p-task  { display:flex;align-items:center;gap:9px;font-size:12px;color:var(--ink2); }
.p-dot   { width:7px;height:7px;border-radius:50%;background:var(--border2);flex-shrink:0;transition:background .3s; }
.p-dot.run  { background:#f59e0b;animation:pulse 1s infinite; }
.p-dot.done { background:var(--teal);animation:none; }

/* ── Sticky top rows (tabs + controls) ── */
.main-sticky-header {
  background: var(--surface);
  padding: 1rem 1.5rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border);
}

/* ── Scrollable content area below sticky header ── */
.main-content-scroll {
  padding: 0;
}

/* ── Scrollable topic list in sidebar ── */
.topic-list-wrap {
  flex: 1;
  overflow-y: auto;
  min-height: 80px;
  max-height: 340px;
  margin: 0 -4px;
  padding: 0 4px;
}

/* ── Mobile-only elements — hidden on desktop ── */
#mob-action-bar,
.mobile-nav,
.mobile-drawer-overlay,
.mobile-drawer {
    display: none;
}


/* ── Desktop layout: fixed viewport, sticky header, scrollable content ── */
@media (min-width: 768px) {
  #s-app {
    height: 100vh;
    overflow: hidden;
  }

  .app-body {
    min-height: 0;
    overflow: hidden;
  }

  .main {
    padding: 0;
    height: 100%;
    overflow: hidden;
    min-height: 0;
    gap: 0;
  }

  .main-sticky-header {
    flex-shrink: 0;
    position: relative;
    z-index: 10;
  }

  .main-content-scroll {
    flex: 1 1 0;
    overflow-y: auto;
    min-height: 0;
    padding: 1.25rem 1.5rem;
  }

  .sidebar {
    height: 100%;
    overflow-y: auto;
    box-sizing: border-box;
  }
}

/* ── Onboarding subject chips ── */
.subj-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: var(--surface2);
  color: var(--ink2);
  font-size: 12px;
  transition: all 0.15s;
}
.subj-chip.sel {
  border-color: var(--teal);
  background: var(--teal-bg, #e8f8f5);
  color: var(--teal-d, #0e7c6b);
  font-weight: 500;
}
.subj-chip.core.sel {
  border-color: var(--teal);
  background: var(--teal-bg, #e8f8f5);
}
.subj-chip:hover:not(.core) {
  border-color: var(--teal);
  background: var(--surface);
}

/* ── Subject picker (landing grid) ── */
.subj-picker-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 8px;
}

.subj-picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}

.subj-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 24px 16px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--r);
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
  text-align: center;
}
.subj-card:hover {
  border-color: var(--teal);
  background: var(--teal-l, #f0faf8);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.subj-card-icon  { font-size: 32px; line-height: 1; }
.subj-card-label { font-size: 13px; font-weight: 600; color: var(--ink1); }
.subj-card-arrow {
  position: absolute;
  bottom: 8px;
  right: 10px;
  font-size: 12px;
  color: var(--ink3);
  opacity: 0;
  transition: opacity 0.15s;
}
.subj-card:hover .subj-card-arrow { opacity: 1; }

/* ── Subject switcher strip ── */
.switcher-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink2);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.12s;
  white-space: nowrap;
}
.switcher-btn:hover  { border-color: var(--teal); color: var(--teal); }
.switcher-btn.active {
  border-color: var(--teal);
  background: var(--teal-l, #f0faf8);
  color: var(--teal);
  font-weight: 600;
}
.switcher-label { display: inline; }

@media (max-width: 600px) {
  .subj-picker-grid { grid-template-columns: repeat(2, 1fr); }
  .switcher-label   { display: none; }
}

/* ── Profile modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.modal-box {
  background: var(--surface);
  border-radius: calc(var(--r) * 2);
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.5rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.modal-header h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink1);
  margin: 0;
}
.modal-close {
  background: none;
  border: none;
  font-size: 18px;
  color: var(--ink3);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  line-height: 1;
}
.modal-close:hover { background: var(--surface2); color: var(--ink1); }
.modal-body {
  padding: 1.25rem 1.5rem;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  gap: 8px;
}
.pf-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.pf-field label {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink2);
}
.pf-field input {
  width: 100%;
  box-sizing: border-box;
}
.pf-hint {
  font-size: 11px;
  color: var(--ink3);
}
.pf-class-btn {
  padding: 5px 10px;
  border-radius: var(--r);
  border: 1px solid var(--border);
  background: var(--surface2);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  color: var(--ink2);
  transition: all 0.12s;
}
.pf-class-btn.sel, .pf-class-btn:hover {
  border-color: var(--teal);
  background: var(--teal-l, #f0faf8);
  color: var(--teal);
}

/* ── Invite / share buttons ── */
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--r);
  border: 1.5px solid var(--border);
  background: var(--surface2);
  color: var(--ink1);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.share-btn:hover         { transform: translateY(-1px);
                           box-shadow: 0 3px 8px rgba(0,0,0,0.1); }
.share-btn.whatsapp:hover { border-color: #25D366; color: #128C7E; }
.share-btn.sms:hover      { border-color: #007AFF; color: #007AFF; }
.share-btn.email:hover    { border-color: var(--teal); color: var(--teal); }

/* ── Login screen styles ── */
.login-hero { text-align: center; margin: 1.5rem 0 2rem; }
.login-hero-icon { font-size: 48px; margin-bottom: 12px; }
.login-hero h2 { font-size: 22px; font-weight: 700; color: var(--ink1); margin: 0 0 8px; }
.login-hero p { font-size: 14px; color: var(--ink3); line-height: 1.6; margin: 0; }
.login-logo { font-size: 26px; font-weight: 800; color: var(--teal); letter-spacing: -0.5px; text-align: center; margin-bottom: 4px; }
.login-tagline { font-size: 12px; color: var(--ink3); text-align: center; margin-bottom: 0; }
.login-note { font-size: 11px; color: var(--ink3); text-align: center; margin-top: 16px; line-height: 1.5; }

/* ── Mobile layout (< 768px) ─────────────────────────────────────────── */
@media (max-width: 767px) {

  /* ── Hide desktop sidebar entirely on mobile ── */
  .sidebar { display: none !important; }

  /* ── Hide desktop tab row and controls row ── */
  #tab-row       { display: none !important; }
  #controls-row  { display: none !important; }
  #subj-switcher { display: none !important; }

  /* ── App body — full height, no flex row ── */
  .app-body {
    flex-direction: column;
    height: calc(100vh - 48px);
    overflow: hidden;
  }

  /* ── Main area — full width, full height ── */
  .main {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }

  /* ── Sticky header — hidden on mobile (tabs/controls hidden) ── */
  .main-sticky-header {
    display: none;
  }

  /* Subject switcher strip — also hidden on mobile */
  #subj-switcher {
    display: none !important;
  }

  /* ── Content — full page vertical scroll ── */
  .main-content-scroll {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 6px 8px 180px;
  }

  /* ── Topbar — compact ── */
  .topbar {
    padding: 8px 12px;
    min-height: 48px;
    flex-shrink: 0;
  }
  .tb-school   { display: none; }
  .user-name   { display: none; }
  .tb-btn      { padding: 5px 10px; font-size: 11px; }

  /* ── Mobile bottom nav bar ── */
  .mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--surface);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: stretch;
    z-index: 200;
    padding-bottom: env(safe-area-inset-bottom);
  }

  .mobile-nav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 10px;
    color: var(--ink3);
    padding: 6px 2px;
    transition: color 0.15s;
    -webkit-tap-highlight-color: transparent;
  }
  .mobile-nav-btn .mn-icon {
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }
  .mobile-nav-btn .mn-icon svg {
    width: 20px;
    height: 20px;
    display: block;
  }
  .mobile-nav-btn.active          { color: var(--teal); }
  .mobile-nav-btn.active .mn-icon { transform: scale(1.1); }

  /* ── Mobile topic drawer ── */
  .mobile-drawer-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 300;
  }
  .mobile-drawer-overlay.open { display: block; }

  .mobile-drawer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    border-radius: 16px 16px 0 0;
    padding: 0 0 env(safe-area-inset-bottom);
    z-index: 301;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
  }
  .mobile-drawer.open { transform: translateY(0); }

  .mobile-drawer-handle {
    width: 36px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    margin: 12px auto 8px;
    flex-shrink: 0;
  }

  .mobile-drawer-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--ink1);
    padding: 4px 16px 12px;
    flex-shrink: 0;
    border-bottom: 1px solid var(--border);
  }

  .mobile-drawer-body {
    overflow-y: auto;
    padding: 12px 16px 16px;
    flex: 1;
  }

  /* Topic list in drawer — vertical stacked */
  .mobile-drawer-body .topic-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .mobile-drawer-body .topic-btn {
    width: 100%;
    text-align: left;
    padding: 10px 14px;
    font-size: 14px;
    border-radius: 8px;
    white-space: normal;
  }

  /* Mobile sliders inside drawer */
  .mobile-slider-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    border-top: 1px solid var(--border);
    margin-top: 8px;
  }
  .mobile-slider-row label {
    font-size: 12px;
    color: var(--ink3);
    white-space: nowrap;
    min-width: 70px;
  }
  .mobile-slider-row input { flex: 1; }
  .mobile-slider-row span  {
    font-size: 12px;
    font-weight: 600;
    color: var(--ink1);
    min-width: 20px;
    text-align: right;
  }

  /* Mobile action bar sliders */
  .mob-action-sliders {
    display: flex;
    gap: 8px;
    flex-direction: column;
    margin-bottom: 4px;
  }
  .mob-action-sliders .mobile-slider-row {
    padding: 4px 0 !important;
    margin: 0 !important;
    border: none !important;
  }

  /* Drawer footer — sticky at bottom, always visible */
  .mobile-drawer-footer {
    padding: 12px 16px;
    padding-bottom: max(12px, env(safe-area-inset-bottom));
    border-top: 1px solid var(--border);
    flex-shrink: 0;
    background: var(--surface);
  }

  /* Generate button in drawer footer */
  .mobile-generate-btn {
    width: 100%;
    padding: 14px;
    background: var(--teal);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
  }
  .mobile-generate-btn:active { opacity: 0.85; }

  /* Subject picker — 2 col grid, full scroll */
  .subj-picker-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .subj-picker-header { flex-direction: column; gap: 4px; }
  .subj-card { padding: 16px 10px; }
  .subj-card-icon  { font-size: 28px; }
  .subj-card-label { font-size: 12px; }

  /* Concepts grid — single column */
  .concepts-grid { grid-template-columns: 1fr; }

  /* Login — full screen */
  .login-box {
    padding: 2rem 1.25rem;
    border-radius: 0;
    min-height: 100vh;
  }
  .gmail-btn { padding: 14px 20px; font-size: 15px; }

  /* Modals — full screen on mobile */
  .modal-box {
    max-height: 100vh;
    border-radius: 0;
    height: 100%;
  }

  /* Onboarding */
  .onboard-box { padding: 1.5rem 1rem; }
}

@media (max-width: 380px) {
  .subj-picker-grid { grid-template-columns: repeat(2, 1fr); }
  .mobile-nav-btn   { font-size: 9px; }
}

/* ── Concepts grid ── */
.concepts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin-top: 4px;
}

.concept-card {
  display: flex;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 14px;
  transition: box-shadow 0.15s;
}
.concept-card:hover { box-shadow: 0 2px 10px rgba(0,0,0,0.07); }
.concept-card.concept-book {
  border-color: var(--teal-b, #b2dfdb);
  background: var(--teal-l, #f0faf8);
}

.concept-num {
  font-size: 11px;
  font-weight: 700;
  color: var(--teal);
  background: var(--teal-l, #e8f5f2);
  border: 1px solid var(--teal-b, #b2dfdb);
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

.concept-body  { flex: 1; min-width: 0; }

.concept-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink1);
  margin-bottom: 2px;
  line-height: 1.4;
}

.concept-topic-tag {
  font-size: 10px;
  color: var(--teal);
  font-weight: 600;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.concept-explanation {
  font-size: 13px;
  color: var(--ink2);
  line-height: 1.65;
}

.concept-book-ref {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  margin-top: 10px;
  padding: 8px 10px;
  background: var(--surface2);
  border-radius: 6px;
  font-size: 12px;
  color: var(--ink2);
  line-height: 1.5;
}
.book-icon { font-size: 14px; flex-shrink: 0; margin-top: 1px; }

/* ── Mobile content — compact fonts and tight spacing ── */
@media (max-width: 767px) {

  /* Base font for all content on mobile */
  .main-content-scroll {
    font-size: 11px;
    padding: 6px 6px 180px;
  }

  /* ── Section head ── */
  .section-head   { margin-bottom: 6px; padding: 0; }
  .sh-title       { font-size: 13px !important; font-weight: 600; }
  .sh-sub         { font-size: 10px !important; margin-top: 1px; }

  /* ── Info pill (board context) ── */
  .info-pill      { font-size: 10px; padding: 4px 8px; margin-bottom: 8px; }

  /* ── Curriculum cards ── */
  .card           { padding: 8px 10px; margin-bottom: 6px; border-radius: 6px; }
  .card-head      { margin-bottom: 4px; gap: 6px; }
  .card-title     { font-size: 12px; font-weight: 600; }
  .card-body      { font-size: 11px; line-height: 1.5; margin-bottom: 5px; }
  .badge          { font-size: 9px; padding: 2px 6px; }
  .obj            { font-size: 10px; padding: 1px 0; gap: 4px; }
  .obj-ok         { font-size: 10px; }
  .mat-row        { gap: 4px; margin-top: 4px; }

  /* ── Examples ── */
  .ex-block       { padding: 8px 10px; margin-bottom: 6px; border-radius: 6px; }
  .ex-label       { font-size: 10px; }
  .ex-q           { font-size: 11px; line-height: 1.5; margin: 5px 0; }
  .step           { gap: 6px; padding: 3px 0; }
  .sn             { font-size: 9px; min-width: 17px; height: 17px; border-radius: 50%;
                    display:flex; align-items:center; justify-content:center;
                    flex-shrink:0; }
  .st-text        { font-size: 11px; line-height: 1.5; }
  .ans-reveal     { font-size: 11px; padding: 5px 8px; margin-top: 5px; }

  /* ── Exercises ── */
  .exq-card       { padding: 8px 10px; margin-bottom: 6px; border-radius: 6px; }
  .exq-meta       { margin-bottom: 5px; gap: 6px; }
  .exq-label      { font-size: 10px; }
  .exq-q          { font-size: 11px; line-height: 1.5; margin-bottom: 5px; }
  .eval-box       { font-size: 10px; padding: 5px 8px; line-height: 1.5; }
  .row-btns       { gap: 5px; margin-top: 4px; }
  .rbtn           { font-size: 11px; padding: 5px 10px; }

  /* ── Results ── */
  .res-hero       { padding: 12px 10px; }
  .res-grade      { font-size: 36px; }
  .res-pct        { font-size: 13px; }
  .res-msg        { font-size: 11px; }
  .res-grid       { gap: 8px; margin: 8px 0; }
  .rs-v           { font-size: 16px; }
  .rs-l           { font-size: 10px; }

  /* ── Concepts ── */
  .concepts-grid  { grid-template-columns: 1fr; gap: 6px; }
  .concept-card   { padding: 8px 10px; gap: 8px; border-radius: 6px; }
  .concept-num    { width: 20px; height: 20px; font-size: 9px; }
  .concept-title  { font-size: 12px; margin-bottom: 1px; }
  .concept-explanation { font-size: 11px; line-height: 1.5; }
  .concept-topic-tag   { font-size: 9px; margin-bottom: 3px; }
  .concept-book-ref    { font-size: 10px; padding: 5px 7px; margin-top: 5px; }
  .book-icon      { font-size: 11px; }

  /* ── Empty states ── */
  .empty          { font-size: 11px; padding: 1.5rem 1rem; }
}