/* ============================================================
   Benka AI — design system
   Switzer body/UI type; rounded display font reserved for the wordmark.
   ============================================================ */

/* Switzer variable font (weights 100–900 in one file), served locally. */
@font-face {
  font-family: "Switzer";
  src: url("../fonts/Switzer-Variable.woff2") format("woff2"),
       url("../fonts/Switzer-Variable.woff") format("woff");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Switzer";
  src: url("../fonts/Switzer-VariableItalic.woff2") format("woff2");
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}

:root {
  --paper: #F5F5FC;
  --paper-2: #EAEAF7;
  --card: #FFFFFF;
  --ink: #201F33;
  --ink-soft: #575572;
  --ink-faint: #8B89A6;
  --line: #E6E5F1;
  --primary: #5B4FE6;
  --primary-deep: #4A3ECB;
  --primary-soft: #ECEAFC;
  --sage: #1F9D5B;
  --sage-soft: #E2F4EB;
  --amber: #DA9224;
  --amber-soft: #FBF0D8;
  --rose: #E1556A;
  --rose-soft: #FCE8EC;
  --brand-1: #6C5CE7;
  --brand-2: #4A3ECB;
  --shadow: 0 1px 2px rgba(37,34,74,.05), 0 10px 28px -14px rgba(37,34,74,.20);
  --shadow-lift: 0 2px 4px rgba(37,34,74,.06), 0 18px 44px -16px rgba(37,34,74,.28);
  --radius: 18px;
  --radius-sm: 11px;
  --font-display: "Switzer", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: "Switzer", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-brand: ui-rounded, "SF Pro Rounded", "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;
}

[data-theme="dark"] {
  --paper: #15141E;
  --paper-2: #1E1C2A;
  --card: #262436;
  --ink: #F1EFFA;
  --ink-soft: #B6B3C9;
  --ink-faint: #837FA0;
  --line: #363447;
  --primary: #9D93FF;
  --primary-deep: #B3ABFF;
  --primary-soft: #2F2C52;
  --sage: #62CE94;
  --sage-soft: #21362C;
  --amber: #E7B75E;
  --amber-soft: #3B3220;
  --rose: #ED8496;
  --rose-soft: #3D2830;
  --brand-1: #8175F0;
  --brand-2: #5B4FE6;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 28px -14px rgba(0,0,0,.5);
  --shadow-lift: 0 2px 4px rgba(0,0,0,.35), 0 18px 44px -16px rgba(0,0,0,.6);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: 28px; }
h2 { font-size: 20px; }
h3 { font-size: 16px; }
p { margin: 0; }
a { color: var(--primary); text-decoration: none; }
button { font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: 15px; color: var(--ink); }
img, svg { max-width: 100%; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- Layout shell ---------- */
.shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 232px; flex-shrink: 0; position: sticky; top: 0; height: 100vh;
  display: flex; flex-direction: column; gap: 4px; padding: 20px 14px;
  border-right: 1px solid var(--line); background: var(--paper);
}
.brand { display: flex; align-items: center; gap: 10px; padding: 6px 10px 18px; }
.brand .logo {
  width: 38px; height: 38px; border-radius: 12px;
  background: linear-gradient(148deg, var(--brand-1), var(--brand-2));
  display: grid; place-items: center; color: #fff; flex-shrink: 0;
  box-shadow: 0 6px 16px -6px var(--brand-2), inset 0 1px 0 rgba(255,255,255,.3);
}
.brand .name { font-family: var(--font-brand); font-size: 21px; font-weight: 700; letter-spacing: -0.02em; }
.brand .tag { font-size: 11px; color: var(--ink-faint); display: block; margin-top: -3px; }

.nav-link {
  display: flex; align-items: center; gap: 11px; padding: 9px 12px; border-radius: var(--radius-sm);
  color: var(--ink-soft); font-weight: 500; font-size: 14.5px; transition: background .15s, color .15s;
}
.nav-link svg { flex-shrink: 0; opacity: .8; }
.nav-link:hover { background: var(--paper-2); color: var(--ink); }
.nav-link.active { background: var(--primary-soft); color: var(--primary); }
.nav-link.active svg { opacity: 1; }
.sidebar .spacer { flex: 1; }
.sidebar .usage-mini { padding: 12px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--card); font-size: 12.5px; color: var(--ink-soft); }
.sidebar .usage-mini .bar { margin-top: 8px; }

.main { flex: 1; min-width: 0; padding: 28px 36px 96px; max-width: 1160px; margin: 0 auto; width: 100%; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 22px; flex-wrap: wrap; }
.page-head .sub { color: var(--ink-soft); margin-top: 5px; font-size: 14px; }

/* Bottom nav (mobile) */
.bottomnav {
  display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 40;
  background: var(--card); border-top: 1px solid var(--line);
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
  justify-content: space-around;
}
.bottomnav a {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  font-size: 10.5px; color: var(--ink-faint); padding: 5px 10px; border-radius: 10px; min-width: 56px;
}
.bottomnav a.active { color: var(--primary); background: var(--primary-soft); }

/* ---------- Cards, buttons, inputs ---------- */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.card.pad { padding: 20px; }
.card.hoverable { transition: transform .18s ease, box-shadow .18s ease; }
.card.hoverable:hover { transform: translateY(-2px); box-shadow: var(--shadow-lift); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 1px solid transparent; border-radius: 12px; padding: 10px 18px;
  font-size: 14.5px; font-weight: 600; cursor: pointer; transition: transform .12s ease, box-shadow .12s ease, background .15s;
  text-decoration: none;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px -6px var(--primary); }
[data-theme="dark"] .btn-primary { color: #1C1B26; }
.btn-primary:hover { background: var(--primary-deep); }
.btn-secondary { background: var(--card); border-color: var(--line); color: var(--ink); }
.btn-secondary:hover { background: var(--paper-2); }
.btn-ghost { background: transparent; color: var(--ink-soft); }
.btn-ghost:hover { background: var(--paper-2); color: var(--ink); }
.btn-danger { background: var(--rose-soft); color: var(--rose); }
.btn-sage { background: var(--sage-soft); color: var(--sage); }
.btn-sage:hover { background: var(--sage); color: #fff; }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 9px; }
.btn-lg { padding: 13px 24px; font-size: 15.5px; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--ink-soft); margin-bottom: 6px; }
.input, textarea.input, select.input {
  width: 100%; padding: 11px 14px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--card); transition: border-color .15s, box-shadow .15s;
}
.input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.input.error { border-color: var(--rose); }
.field .err { color: var(--rose); font-size: 12.5px; margin-top: 5px; display: block; }
textarea.input { resize: vertical; min-height: 140px; }

.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--card); font-size: 12.5px; font-weight: 500;
  color: var(--ink-soft); cursor: pointer; transition: all .15s;
}
.chip:hover { border-color: var(--primary); color: var(--primary); }
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }
[data-theme="dark"] .chip.active { color: #1C1B26; }
.tag-pill { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 11.5px; font-weight: 600; background: var(--primary-soft); color: var(--primary); }

.bar { height: 7px; border-radius: 99px; background: var(--paper-2); overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 99px; background: var(--primary); transition: width .5s ease; }
.bar.sage > i { background: var(--sage); }
.bar.amber > i { background: var(--amber); }
.bar.rose > i { background: var(--rose); }

.badge { display: inline-flex; align-items: center; gap: 5px; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge.sage { background: var(--sage-soft); color: var(--sage); }
.badge.amber { background: var(--amber-soft); color: var(--amber); }
.badge.rose { background: var(--rose-soft); color: var(--rose); }
.badge.indigo { background: var(--primary-soft); color: var(--primary); }

.muted { color: var(--ink-soft); }
.faint { color: var(--ink-faint); }
.small { font-size: 13px; }
.tiny { font-size: 12px; }

/* ---------- Auth ---------- */
.auth-wrap { min-height: 100vh; display: grid; grid-template-columns: 1fr 1fr; }
.auth-hero {
  background: linear-gradient(160deg, var(--primary) 0%, var(--primary-deep) 70%);
  color: #FAF7F2; padding: 56px; display: flex; flex-direction: column; justify-content: space-between;
  position: relative; overflow: hidden;
}
.auth-hero::after {
  content: ""; position: absolute; inset: 0; opacity: .12; pointer-events: none;
  background-image: radial-gradient(circle at 20% 30%, #fff 0 2px, transparent 2px), radial-gradient(circle at 70% 60%, #fff 0 2px, transparent 2px), radial-gradient(circle at 40% 85%, #fff 0 2px, transparent 2px);
  background-size: 180px 180px;
}
.auth-hero .brand { color: #FAF7F2; padding: 0; }
.auth-hero .brand .logo { background: rgba(250,247,242,.16); }
.auth-hero h1 { font-size: 38px; line-height: 1.15; max-width: 420px; color: #FAF7F2; }
.auth-hero .points { display: flex; flex-direction: column; gap: 14px; margin-top: 28px; }
.auth-hero .points div { display: flex; gap: 11px; align-items: flex-start; font-size: 14.5px; opacity: .92; max-width: 400px; }
.auth-hero .quote { font-size: 13px; opacity: .75; font-style: italic; }
.auth-panel { display: flex; align-items: center; justify-content: center; padding: 40px 24px; }
.auth-card { width: 100%; max-width: 400px; }
.auth-card h2 { font-size: 26px; margin-bottom: 6px; }
.oauth-btn {
  width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 11px; border-radius: 12px; border: 1px solid var(--line); background: var(--card);
  font-size: 14.5px; font-weight: 600; color: var(--ink); cursor: pointer; margin-bottom: 10px;
  transition: background .15s, border-color .15s;
}
.oauth-btn:hover { background: var(--paper-2); border-color: var(--ink-faint); }
.oauth-btn:disabled { opacity: .6; cursor: default; }
.divider { display: flex; align-items: center; gap: 12px; color: var(--ink-faint); font-size: 12px; margin: 18px 0; text-transform: uppercase; letter-spacing: .08em; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--line); }

/* ---------- Dashboard ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 22px; }
.stat { padding: 18px; }
.stat .label { font-size: 12.5px; font-weight: 600; color: var(--ink-faint); text-transform: uppercase; letter-spacing: .05em; display: flex; align-items: center; gap: 7px; }
.stat .value { font-family: var(--font-display); font-size: 30px; font-weight: 700; margin-top: 6px; }
.stat .hint { font-size: 12.5px; color: var(--ink-soft); margin-top: 3px; }
.dash-cols { display: grid; grid-template-columns: 1.7fr 1fr; gap: 18px; align-items: start; }
.section-title { display: flex; align-items: center; justify-content: space-between; margin: 4px 0 12px; }

.note-row { display: flex; align-items: center; gap: 13px; padding: 13px 16px; border-bottom: 1px solid var(--line); transition: background .15s; color: var(--ink); }
.note-row:last-child { border-bottom: none; }
.note-row:hover { background: var(--paper-2); }
.note-row .doc-ic { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; flex-shrink: 0; }
.note-row .meta { min-width: 0; flex: 1; }
.note-row .meta .t { font-weight: 600; font-size: 14.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.note-row .meta .s { font-size: 12.5px; color: var(--ink-faint); }

.chart { display: flex; align-items: flex-end; gap: 9px; height: 110px; padding-top: 8px; }
.chart .col { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 6px; height: 100%; justify-content: flex-end; }
.chart .col i { width: 100%; max-width: 30px; border-radius: 6px 6px 3px 3px; background: var(--primary-soft); position: relative; transition: height .6s ease; }
.chart .col.hot i { background: var(--primary); }
.chart .col b { font-size: 10.5px; color: var(--ink-faint); font-weight: 500; }

.quiz-score-row { display: flex; align-items: center; gap: 12px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.quiz-score-row:last-child { border-bottom: none; }
.score-ring { width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center; font-size: 12px; font-weight: 700; flex-shrink: 0; }

/* ---------- Create / upload ---------- */
.tabs { display: flex; gap: 4px; background: var(--paper-2); border-radius: 12px; padding: 4px; width: fit-content; margin-bottom: 18px; }
.tabs button { border: none; background: transparent; padding: 8px 18px; border-radius: 9px; font-size: 14px; font-weight: 600; color: var(--ink-soft); cursor: pointer; }
.tabs button.active { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }

.dropzone {
  border: 2px dashed var(--line); border-radius: var(--radius); padding: 44px 24px; text-align: center;
  background: var(--card); transition: border-color .2s, background .2s; cursor: pointer;
}
.dropzone:hover, .dropzone.drag { border-color: var(--primary); background: var(--primary-soft); }
.dropzone.compact { padding: 20px 24px; display: flex; align-items: center; gap: 14px; text-align: left; }
.dropzone.compact .ic { width: 40px; height: 40px; margin: 0; flex-shrink: 0; }
.dropzone.compact h3 { margin-bottom: 2px; }
.dropzone.compact p { margin: 0; max-width: none; }
.dropzone .ic { width: 52px; height: 52px; border-radius: 14px; background: var(--primary-soft); color: var(--primary); display: grid; place-items: center; margin: 0 auto 14px; }
.dropzone.drag .ic { background: var(--card); }

.file-card { display: flex; align-items: center; gap: 13px; padding: 14px 16px; }
.file-card .ext { width: 42px; height: 42px; border-radius: 10px; display: grid; place-items: center; font-size: 10.5px; font-weight: 800; letter-spacing: .04em; flex-shrink: 0; }
.file-card .bar { margin-top: 7px; }

.gen-steps { display: flex; flex-direction: column; gap: 13px; padding: 6px 0; }
.gen-step { display: flex; align-items: center; gap: 11px; font-size: 14px; color: var(--ink-faint); transition: color .3s; }
.gen-step .dot { width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--line); display: grid; place-items: center; flex-shrink: 0; transition: all .3s; }
.gen-step.active { color: var(--ink); font-weight: 600; }
.gen-step.active .dot { border-color: var(--primary); }
.gen-step.active .dot::after { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--primary); animation: pulse 1s ease infinite; }
.gen-step.done { color: var(--sage); }
.gen-step.done .dot { border-color: var(--sage); background: var(--sage); color: #fff; font-size: 11px; }
@keyframes pulse { 50% { opacity: .35; transform: scale(.8); } }

.summary-view h2 { margin-bottom: 4px; }
.summary-sec { margin-top: 20px; }
.summary-sec h3 { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; font-size: 15px; }
.summary-sec ul { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 6px; font-size: 14.5px; }
.sum-subsec { margin: 0 0 14px; padding: 12px 16px; border-left: 3px solid var(--primary-soft); background: var(--paper); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.sum-subsec h4 { margin: 0 0 7px; font-family: var(--font-display); font-size: 14.5px; font-weight: 700; color: var(--primary); }
.sum-subsec ul { margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 6px; font-size: 14px; }
.sum-subsec li b { color: var(--ink); }
.sec-intro { font-size: 14px; color: var(--ink-soft); margin: 0 0 9px; }
.sec-para { font-size: 14.5px; margin: 0 0 10px; line-height: 1.6; }
.sec-para:last-child { margin-bottom: 0; }

/* summary tables (assessment breakdowns, comparisons) */
.sum-table-wrap { overflow-x: auto; margin-top: 10px; }
.sum-table { width: 100%; border-collapse: collapse; font-size: 13.5px; background: var(--card); border-radius: var(--radius-sm); overflow: hidden; }
.sum-table th { text-align: left; padding: 9px 12px; background: var(--primary-soft); color: var(--primary); font-weight: 700; font-size: 12.5px; }
.sum-table td { padding: 9px 12px; border-top: 1px solid var(--line); vertical-align: top; }

/* mind map: root on the left, branches as an elbow-connector tree */
.mindmap { display: flex; align-items: center; gap: 0; overflow-x: auto; padding: 10px 2px; }
.mm-root {
  flex-shrink: 0; max-width: 170px; padding: 12px 16px; border-radius: 14px;
  background: var(--primary); color: #fff; font-family: var(--font-display);
  font-weight: 700; font-size: 15px; text-align: center;
}
[data-theme="dark"] .mm-root { color: #1C1B26; }
.mm-branches { list-style: none; margin: 0; padding: 0 0 0 26px; display: flex; flex-direction: column; gap: 14px; position: relative; }
.mm-branches::before { content: ""; position: absolute; left: 12px; top: 18px; bottom: 18px; width: 2px; background: var(--line); border-radius: 2px; }
.mm-branches > li { position: relative; padding-left: 14px; }
.mm-branches > li::before { content: ""; position: absolute; left: -14px; top: 16px; width: 26px; height: 2px; background: var(--line); }
.mm-branch {
  display: inline-block; padding: 6px 13px; border-radius: 10px; font-weight: 700; font-size: 13.5px;
  border: 1.5px solid; background: var(--card); margin-bottom: 7px;
}
.mm-children { list-style: none; margin: 0; padding: 0 0 0 22px; display: flex; flex-direction: column; gap: 5px; position: relative; }
.mm-children::before { content: ""; position: absolute; left: 9px; top: 4px; bottom: 8px; width: 2px; background: var(--line); }
.mm-children li { position: relative; padding: 3px 10px; font-size: 12.5px; color: var(--ink-soft); background: var(--paper-2); border-radius: 8px; width: fit-content; max-width: 100%; }
.mm-children li::before { content: ""; position: absolute; left: -13px; top: 50%; width: 13px; height: 2px; background: var(--line); }
.mm-branch.c0 { border-color: var(--primary); color: var(--primary); }
.mm-branch.c1 { border-color: var(--sage); color: var(--sage); }
.mm-branch.c2 { border-color: var(--amber); color: var(--amber); }
.mm-branch.c3 { border-color: var(--rose); color: var(--rose); }
.mm-branch.c4 { border-color: var(--ink-soft); color: var(--ink-soft); }
.mm-children li.c1 { border-left: 3px solid var(--sage); }
.mm-children li.c2 { border-left: 3px solid var(--amber); }
.mm-children li.c3 { border-left: 3px solid var(--rose); }
.mm-children li.c4 { border-left: 3px solid var(--ink-faint); }
.mm-children li.c0 { border-left: 3px solid var(--primary); }
.concept { padding: 11px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--paper); margin-bottom: 8px; font-size: 14px; }
.concept b { color: var(--primary); }
.exam-point { display: flex; gap: 10px; padding: 9px 12px; background: var(--amber-soft); border-radius: var(--radius-sm); margin-bottom: 8px; font-size: 14px; align-items: flex-start; }

/* ---------- Notes ---------- */
.notes-toolbar { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; align-items: center; }
.search-box { position: relative; flex: 1; min-width: 220px; }
.search-box svg { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--ink-faint); }
.search-box .input { padding-left: 40px; }
.folder-chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.notes-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 15px; }
.note-card { padding: 18px; display: flex; flex-direction: column; gap: 10px; color: var(--ink); }
.note-card .top { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.note-card h3 { font-size: 16px; line-height: 1.3; }
.note-card .excerpt { font-size: 13px; color: var(--ink-soft); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.note-card .foot { display: flex; justify-content: space-between; align-items: center; margin-top: auto; padding-top: 8px; font-size: 12px; color: var(--ink-faint); }
.note-card .tags { display: flex; gap: 6px; flex-wrap: wrap; }
.note-card.selectable { cursor: pointer; }
.note-card.selected { border-color: var(--primary); box-shadow: 0 0 0 1px var(--primary); background: var(--primary-soft); }
.note-check { width: 22px; height: 22px; border-radius: 999px; border: 2px solid var(--line); background: var(--card); display: inline-flex; align-items: center; justify-content: center; color: #fff; flex: none; }
.note-check.on { background: var(--primary); border-color: var(--primary); }
.select-bar { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; padding: 10px 8px 10px 14px; margin-bottom: 14px; background: var(--primary-soft); border: 1px solid var(--primary); border-radius: var(--radius-sm); font-size: 14px; font-weight: 600; color: var(--primary); }
.select-bar-actions { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }

.empty {
  text-align: center; padding: 56px 24px; color: var(--ink-soft);
}
.empty .ic { width: 64px; height: 64px; border-radius: 18px; background: var(--paper-2); display: grid; place-items: center; margin: 0 auto 16px; color: var(--ink-faint); }
.empty h3 { margin-bottom: 6px; color: var(--ink); }
.empty p { max-width: 380px; margin: 0 auto 18px; font-size: 14px; }

/* ---------- Quiz ---------- */
.quiz-setup-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 14px 0 20px; }
.quiz-type {
  border: 1.5px solid var(--line); border-radius: var(--radius); padding: 16px; cursor: pointer;
  background: var(--card); text-align: left; transition: all .15s; font-family: inherit;
}
.quiz-type:hover { border-color: var(--ink-faint); }
.quiz-type.active { border-color: var(--primary); background: var(--primary-soft); box-shadow: 0 0 0 1px var(--primary); }
.quiz-type .t { font-weight: 700; font-size: 14.5px; display: flex; gap: 8px; align-items: center; color: var(--ink); }
.quiz-type .d { font-size: 12.5px; color: var(--ink-soft); margin-top: 5px; }

.q-progress { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.q-progress .bar { flex: 1; }
.q-card { padding: 26px; }
.q-card .qnum { font-size: 12px; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: .07em; margin-bottom: 10px; }
.q-card .qtext { font-size: 17.5px; font-weight: 600; font-family: var(--font-display); line-height: 1.4; margin-bottom: 20px; }
.opt {
  display: flex; align-items: flex-start; gap: 12px; width: 100%; text-align: left; padding: 13px 16px;
  border: 1.5px solid var(--line); border-radius: 12px; background: var(--card); cursor: pointer;
  font-size: 14.5px; margin-bottom: 10px; transition: all .13s; font-family: inherit; color: var(--ink);
}
.opt:hover:not([disabled]) { border-color: var(--primary); background: var(--primary-soft); }
.opt .key { width: 24px; height: 24px; border-radius: 7px; border: 1.5px solid var(--line); display: grid; place-items: center; font-size: 12px; font-weight: 700; flex-shrink: 0; color: var(--ink-soft); }
.opt.sel { border-color: var(--primary); background: var(--primary-soft); }
.opt.sel .key { background: var(--primary); border-color: var(--primary); color: #fff; }
.opt.correct { border-color: var(--sage); background: var(--sage-soft); }
.opt.correct .key { background: var(--sage); border-color: var(--sage); color: #fff; }
.opt.wrong { border-color: var(--rose); background: var(--rose-soft); }
.opt.wrong .key { background: var(--rose); border-color: var(--rose); color: #fff; }
.explain { padding: 13px 16px; border-radius: 12px; background: var(--paper-2); font-size: 13.5px; color: var(--ink-soft); margin-top: 6px; border-left: 3px solid var(--primary); }
.src-quote {
  margin-top: 9px; padding: 7px 11px; border-left: 3px solid var(--sage);
  background: var(--sage-soft); border-radius: 0 8px 8px 0;
  font-size: 12.5px; font-style: italic; color: var(--ink-soft);
}

/* flashcards */
.flash-stage { perspective: 1200px; margin-bottom: 18px; }
.flash-card {
  position: relative; height: 280px; cursor: pointer; transform-style: preserve-3d;
  transition: transform .5s cubic-bezier(.4,.1,.2,1);
}
.flash-card.flipped { transform: rotateY(180deg); }
.flash-face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px;
  padding: 32px; text-align: center; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow);
}
.flash-face.back { transform: rotateY(180deg); background: var(--primary-soft); }
.flash-face .side-label { font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); }
.flash-face .content { font-size: 19px; font-weight: 600; font-family: var(--font-display); line-height: 1.4; }
.flash-actions { display: flex; gap: 10px; justify-content: center; }

/* results */
.result-hero { text-align: center; padding: 36px 24px; }
.big-ring {
  width: 128px; height: 128px; border-radius: 50%; display: grid; place-items: center;
  font-family: var(--font-display); font-size: 32px; font-weight: 700; flex-shrink: 0;
}
.result-hero .big-ring { margin: 0 auto 18px; }
.review-q { padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 11px; background: var(--card); }
.review-q .head { display: flex; gap: 10px; align-items: flex-start; font-weight: 600; font-size: 14.5px; }
.review-q .mark { flex-shrink: 0; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-size: 11px; color: #fff; margin-top: 1px; }

/* ---------- Study plan ---------- */
.week-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 10px; }
.day-col { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 11px; min-height: 148px; }
.day-col.today { border-color: var(--primary); box-shadow: 0 0 0 1px var(--primary); }
.day-col .d-name { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-faint); }
.day-col .d-num { font-family: var(--font-display); font-size: 19px; font-weight: 700; margin-bottom: 8px; }
.day-col.today .d-num { color: var(--primary); }
.session { font-size: 11.5px; padding: 5px 8px; border-radius: 7px; margin-bottom: 5px; font-weight: 600; line-height: 1.3; }
.session.clickable { cursor: pointer; transition: transform .12s, filter .12s; }
.session.clickable:hover { transform: translateX(2px); filter: brightness(.96); }
.day-col.past { opacity: .45; }
.exam-add { padding: 14px 18px 18px; border-top: 1px solid var(--line); margin-top: 8px; }
.exam-row { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.exam-row:last-child { border-bottom: none; }
.exam-row .date-block {
  width: 52px; height: 56px; border-radius: 12px; background: var(--primary-soft); color: var(--primary);
  display: flex; flex-direction: column; align-items: center; justify-content: center; flex-shrink: 0;
}
.exam-row .date-block b { font-family: var(--font-display); font-size: 20px; line-height: 1; }
.exam-row .date-block span { font-size: 10px; font-weight: 700; text-transform: uppercase; }
.rec-row { display: flex; gap: 12px; padding: 13px 0; border-bottom: 1px solid var(--line); align-items: flex-start; }
.rec-row:last-child { border-bottom: none; }
.rec-row .why { font-size: 12.5px; color: var(--ink-faint); margin-top: 2px; }

/* ---------- Settings ---------- */
.settings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: start; }
.avatar {
  width: 62px; height: 62px; border-radius: 50%; background: var(--primary); color: #fff;
  display: grid; place-items: center; font-family: var(--font-display); font-size: 24px; font-weight: 700;
}
[data-theme="dark"] .avatar { color: #1C1B26; }
.setting-row { display: flex; justify-content: space-between; align-items: center; padding: 13px 0; border-bottom: 1px solid var(--line); gap: 16px; }
.setting-row:last-child { border-bottom: none; }
.switch { position: relative; width: 44px; height: 25px; flex-shrink: 0; cursor: pointer; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .track { position: absolute; inset: 0; border-radius: 99px; background: var(--paper-2); border: 1px solid var(--line); transition: background .2s; }
.switch .track::after { content: ""; position: absolute; top: 2px; left: 2px; width: 19px; height: 19px; border-radius: 50%; background: var(--card); box-shadow: 0 1px 3px rgba(0,0,0,.25); transition: transform .2s; }
.switch input:checked + .track { background: var(--primary); border-color: var(--primary); }
.switch input:checked + .track::after { transform: translateX(19px); }

/* ---------- Review deck / chat ---------- */
.review-cta { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; border-left: 4px solid var(--primary); }
.review-cta .rc-ic { width: 42px; height: 42px; border-radius: 12px; background: var(--primary-soft); color: var(--primary); display: grid; place-items: center; flex-shrink: 0; }

.chat-box {
  max-height: 280px; overflow-y: auto; display: flex; flex-direction: column; gap: 8px;
  padding: 12px; background: var(--paper); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 9px;
}
.chat-empty { font-size: 13px; color: var(--ink-faint); text-align: center; padding: 14px 8px; }
.chat-msg {
  max-width: 86%; padding: 9px 13px; border-radius: 13px; font-size: 13.5px; line-height: 1.5;
  white-space: pre-wrap; word-break: break-word;
}
.chat-msg.user { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 4px; }
[data-theme="dark"] .chat-msg.user { color: #1C1B26; }
.chat-msg.ai { align-self: flex-start; background: var(--card); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.chat-msg.thinking { color: var(--ink-faint); animation: pulse 1.2s ease infinite; }
.chat-input-row { display: flex; gap: 8px; }
.chat-input-row .input { flex: 1; }

/* exam readiness */
.ready-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 14px; }
.ready-card { border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 15px; background: var(--paper); }
.ready-head { display: flex; align-items: center; gap: 13px; margin-bottom: 12px; }
.rbar { display: flex; align-items: center; gap: 9px; margin-bottom: 6px; }
.rbar-label { width: 88px; flex-shrink: 0; font-size: 12px; font-weight: 600; color: var(--ink-soft); }
.rbar-val { width: 34px; text-align: right; font-size: 11.5px; font-weight: 700; color: var(--ink-soft); }
.gap-list { margin-top: 12px; border-top: 1px dashed var(--line); padding-top: 10px; display: flex; flex-direction: column; gap: 8px; }
.gap-row { display: flex; align-items: center; gap: 10px; }
.gap-t { font-size: 12.5px; font-weight: 600; }

/* listen (text-to-speech) bar */
.tts-bar {
  display: flex; align-items: center; gap: 9px; flex-wrap: wrap;
  padding: 9px 12px; margin: 10px 0 4px;
  background: var(--paper); border: 1px solid var(--line); border-radius: 12px;
}

/* ---------- Toasts / skeleton / modal ---------- */
.toasts { position: fixed; bottom: 22px; right: 22px; z-index: 100; display: flex; flex-direction: column; gap: 9px; }
.toast {
  background: var(--ink); color: var(--paper); padding: 12px 18px; border-radius: 12px; font-size: 13.5px; font-weight: 500;
  box-shadow: var(--shadow-lift); animation: toast-in .28s ease; display: flex; gap: 9px; align-items: center; max-width: 340px;
}
.toast.err { background: var(--rose); color: #fff; }
@keyframes toast-in { from { opacity: 0; transform: translateY(10px) scale(.96); } }

.skeleton { border-radius: 8px; background: linear-gradient(90deg, var(--paper-2) 25%, var(--line) 50%, var(--paper-2) 75%); background-size: 200% 100%; animation: shimmer 1.3s infinite; }
@keyframes shimmer { to { background-position: -200% 0; } }

.fade-in { animation: fade-in .3s ease; }
@keyframes fade-in { from { opacity: 0; transform: translateY(6px); } }

.modal-overlay { position: fixed; inset: 0; background: rgba(20,19,30,.45); z-index: 60; display: grid; place-items: center; padding: 20px; animation: fade-in .2s; }
.modal { width: 100%; max-width: 440px; padding: 24px; }

/* ---------- Responsive ---------- */
@media (max-width: 1020px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .dash-cols, .settings-grid { grid-template-columns: 1fr; }
  .auth-wrap { grid-template-columns: 1fr; }
  .auth-hero { display: none; }
}
@media (max-width: 880px) {
  .sidebar { display: none; }
  .bottomnav { display: flex; }
  .main { padding: 20px 16px 100px; }
  .quiz-setup-grid { grid-template-columns: 1fr; }
  .week-grid { grid-template-columns: repeat(2, 1fr); }
  .day-col { min-height: 0; }
  h1 { font-size: 23px; }
  .q-card { padding: 18px; }
  .flash-card { height: 240px; }
}
@media (max-width: 480px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat .value { font-size: 24px; }
  .notes-grid { grid-template-columns: 1fr; }
  .week-grid { grid-template-columns: 1fr 1fr; }
}

/* ---------- Revision status chips ---------- */
.status-chip{display:inline-flex;align-items:center;gap:6px;font-size:11.5px;font-weight:600;
  padding:2.5px 10px;border-radius:99px;border:1.5px solid transparent;line-height:1.5;white-space:nowrap}
.status-chip::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor;flex:none}
.status-not_started{background:var(--paper-2);color:var(--ink-faint)}
.status-in_progress{background:var(--amber-soft);color:var(--amber)}
.status-completed{background:var(--sage-soft);color:var(--sage)}
button.status-btn{cursor:pointer;font-family:inherit;opacity:.45;transition:opacity .12s,border-color .12s}
button.status-btn:hover{opacity:.8}
button.status-btn.on{opacity:1;border-color:currentColor}

/* ---------- Duolingo-style review lessons ---------- */
.duo-wrap{max-width:620px}
.duo-top{display:flex;align-items:center;gap:14px;margin-bottom:10px}
.duo-bar{flex:1;height:14px;background:var(--paper-2);border-radius:99px;overflow:hidden}
.duo-bar i{display:block;height:100%;background:#3fae63;border-radius:99px;transition:width .35s cubic-bezier(.22,1,.36,1)}
.duo-xp{font-size:13px;font-weight:700;color:var(--amber);white-space:nowrap}
.duo-prompt{font-size:13px;font-weight:600;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.06em;margin-bottom:8px}
.duo-term{font-size:21px;font-weight:700;line-height:1.35;margin-bottom:16px}
.duo-shown{background:var(--card,#fff);border:2px solid var(--line);border-radius:14px;padding:14px 16px;margin-bottom:16px;font-size:15px;line-height:1.5}
.duo-opts{display:flex;flex-direction:column;gap:10px;margin-bottom:16px}
.duo-opts.duo-tf{flex-direction:row}
.duo-opts.duo-tf .duo-opt{flex:1;justify-content:center;text-align:center}
.duo-opt{display:flex;align-items:flex-start;gap:10px;width:100%;text-align:left;background:var(--card,#fff);color:var(--ink);
  border:2px solid var(--line);border-bottom-width:4px;border-radius:14px;padding:13px 15px;font-size:14.5px;
  line-height:1.45;font-family:inherit;cursor:pointer;transition:transform .06s,border-color .12s,background .12s}
.duo-opt:hover:not(:disabled){border-color:var(--ink-faint)}
.duo-opt:active:not(:disabled){transform:translateY(2px);border-bottom-width:2px;margin-bottom:2px}
.duo-opt.sel{border-color:var(--primary);background:var(--primary-soft);color:var(--primary)}
.duo-opt.right,.duo-opt.right-plain:hover{border-color:var(--sage);background:var(--sage-soft);color:var(--sage)}
.duo-opt.wrong{border-color:var(--rose);background:var(--rose-soft);color:var(--rose)}
.duo-opt:disabled{cursor:default;opacity:.92}
.duo-opt .k{flex:none;width:22px;height:22px;border:1.5px solid currentColor;border-radius:6px;display:inline-flex;
  align-items:center;justify-content:center;font-size:11.5px;font-weight:700;opacity:.55;margin-top:1px}
.duo-check{width:100%;padding:13px}
.duo-check:disabled{opacity:.45}
.duo-foot{display:flex;align-items:center;justify-content:space-between;gap:14px;border-radius:14px;
  padding:14px 16px;margin-top:4px;animation:duoIn .18s ease-out}
.duo-foot.ok{background:var(--sage-soft);color:var(--sage)}
.duo-foot.bad{background:var(--rose-soft);color:var(--rose)}
.duo-continue{background:#3fae63;color:#fff;font-weight:700;padding:10px 22px;flex:none}
.duo-continue:hover{background:#379857}
.duo-continue.bad{background:#d9584a}
.duo-continue.bad:hover{background:#c04b3e}
@keyframes duoIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.duo-stats{display:flex;gap:12px;justify-content:center;margin-top:18px}
.duo-stat{border-radius:12px;padding:10px 22px;text-align:center}
.duo-stat span{display:block;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;opacity:.75}
.duo-stat b{font-size:20px}
.duo-stat.xp{background:var(--amber-soft);color:var(--amber)}
.duo-stat.acc{background:var(--sage-soft);color:var(--sage)}

/* ---------- Feedback & ratings ---------- */
.fb-stars{display:flex;gap:4px}
.fb-star{background:none;border:none;cursor:pointer;font-size:34px;line-height:1;padding:2px;
  color:var(--line);transition:transform .1s,color .12s;font-family:inherit}
.fb-star:hover{transform:scale(1.15)}
.fb-star.on{color:#eab308}
.fb-star:hover,.fb-star:has(~ .fb-star:hover){color:#eab308}
.fb-entry{border-top:1px solid var(--line);padding:12px 0 10px}
.fb-entry:first-of-type{border-top:none}
.fb-entry-stars{color:#eab308;font-size:15px;letter-spacing:1px}
.fb-entry-stars .off{color:var(--line)}

/* ---------- Knowledge map ---------- */
.map-frame{background:var(--card,#fff);border:1px solid var(--line);border-radius:16px;overflow:hidden;
  height:min(62vh,560px);touch-action:none}
.map-frame svg{width:100%;height:100%;display:block;user-select:none}
.map-legend{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:10px;font-size:12.5px;color:#7c7466}
.map-leg{display:inline-flex;align-items:center;gap:6px}
.map-leg i{width:10px;height:10px;border-radius:50%;display:inline-block}
.map-panel{margin-top:14px;max-width:640px}
.map-node:hover circle{filter:brightness(.96);stroke-width:3.4}
.map-hub:hover circle{opacity:1}

/* ---------- Focus tools (sprints, pomodoro, just-start) ---------- */
#sprintWidget{position:fixed;right:22px;bottom:22px;z-index:60;display:flex;align-items:center;gap:13px;
  --sw-bg:#4A3ECB;background:var(--sw-bg);border:none;border-radius:99px;padding:12px 18px 12px 12px;color:#fff;
  box-shadow:0 12px 32px -6px rgba(74,62,203,.55)}
#sprintWidget.brk{--sw-bg:#0E9E96;box-shadow:0 12px 32px -6px rgba(14,158,150,.55)}
#sprintWidget .sw-ring{width:46px;height:46px;border-radius:50%;position:relative;flex:none}
#sprintWidget .sw-ring::after{content:"";position:absolute;inset:6px;border-radius:50%;background:var(--sw-bg)}
#sprintWidget .sw-mid{display:flex;flex-direction:column;line-height:1.12}
#sprintWidget .sw-time{font-size:25px;font-weight:800;letter-spacing:.5px;font-variant-numeric:tabular-nums}
#sprintWidget .sw-label{font-size:12px;font-weight:600;color:rgba(255,255,255,.9);text-transform:uppercase;letter-spacing:.03em}
#sprintWidget .sw-stop{background:rgba(255,255,255,.16);border:none;cursor:pointer;color:#fff;font-size:14px;
  width:26px;height:26px;border-radius:50%;display:grid;place-items:center;padding:0;flex:none;transition:background .12s}
#sprintWidget .sw-stop:hover{background:rgba(255,255,255,.32)}
.focus-card{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin-bottom:18px;
  border-left:4px solid #3fae63}

/* ---------- Pomodoro button (thematic tomato accent) ---------- */
.btn-pomo{background:#E8543B;color:#fff;font-weight:700;box-shadow:0 4px 14px -6px #E8543B}
.btn-pomo:hover{background:#d34329}
[data-theme="dark"] .btn-pomo{color:#fff}