:root {
  /* Painel de estudo: barra lateral azul-petróleo, conteúdo em cartões sobre papel esverdeado.
     Toda cor passa por estes tokens; o tema escuro só redefine os valores. */
  --ink: #173541;
  --muted: #556a71;
  --faint: #5f706d;
  --line: #dfe6e5;
  --line-strong: #c8d6cf;
  --paper: #f3f6f3;
  --surface: #fff;
  --surface-2: #f7faf7;
  --soft: #eaf1ec;
  --soft-2: #e1ebe4;
  --navy: #102e39;
  --navy-2: #23434e;
  --navy-3: #284650;
  --navy-line: #6b7977;
  --on-navy: #fff;
  --on-navy-muted: #b9cbd0;
  --btn: #173541;
  --on-btn: #fff;
  --green: #286e60;
  --green-2: #41836b;
  --green-line: #7aa38b;
  --gold: #ddae64;
  --gold-light: #edd2a4;
  --gold-soft: #f7edda;
  --gold-line: #e6d3ab;
  --on-gold: #102e39;
  --ok: #22603f;
  --ok-fill: #2f7d5b;
  --ok-soft: #e3f2e9;
  --bad: #8f3328;
  --bad-fill: #b5473a;
  --bad-soft: #fbe9e5;
  --warn-soft: #fff5e3;
  --warn-line: #eee0c3;
  --warn-ink: #7b632b;
  --mark: #f6dd8f;
  --paper-warm: #fbfaf5;
  --paper-warm-2: #f1f0e8;
  --paper-warm-line: #ece8da;
  --reader-ink: #1d2b2f;
  --shadow: 0 1px 2px rgba(16, 46, 57, 0.05), 0 6px 20px rgba(16, 46, 57, 0.05);
  --shadow-lg: 0 2px 6px rgba(16, 46, 57, 0.06), 0 24px 60px rgba(16, 46, 57, 0.12);
  --display: 'Bricolage Grotesque', 'IBM Plex Sans', ui-sans-serif, system-ui, sans-serif;
  --body: 'IBM Plex Sans', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --ink: #e4ecea;
    --muted: #9db0b2;
    --faint: #788b8d;
    --line: #22363d;
    --line-strong: #2f4950;
    --paper: #0b171c;
    --surface: #102128;
    --surface-2: #132830;
    --soft: #172e36;
    --soft-2: #1d3840;
    --navy: #081419;
    --navy-2: #15303a;
    --navy-3: #1c3b46;
    --navy-line: #3d5359;
    --btn: #dfe9e6;
    --on-btn: #0b171c;
    --green: #74c7aa;
    --green-2: #4fa587;
    --green-line: #3f7a66;
    --gold-soft: #33291a;
    --gold-line: #5a4a2c;
    --ok: #79d0a2;
    --ok-fill: #2f7d5b;
    --ok-soft: #14332a;
    --bad: #f19a8d;
    --bad-fill: #b5473a;
    --bad-soft: #3a1f1b;
    --warn-soft: #2f2515;
    --warn-line: #54421f;
    --warn-ink: #e8c98a;
    --mark: #7a6420;
    --paper-warm: #141f22;
    --paper-warm-2: #1a282b;
    --paper-warm-line: #263538;
    --reader-ink: #dfe6e2;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.22);
    --shadow-lg: 0 2px 6px rgba(0, 0, 0, 0.35), 0 24px 60px rgba(0, 0, 0, 0.45);
    color-scheme: dark;
  }
}
:root[data-theme='dark'] {
  --ink: #e4ecea;
  --muted: #9db0b2;
  --faint: #788b8d;
  --line: #22363d;
  --line-strong: #2f4950;
  --paper: #0b171c;
  --surface: #102128;
  --surface-2: #132830;
  --soft: #172e36;
  --soft-2: #1d3840;
  --navy: #081419;
  --navy-2: #15303a;
  --navy-3: #1c3b46;
  --navy-line: #3d5359;
  --btn: #dfe9e6;
  --on-btn: #0b171c;
  --green: #74c7aa;
  --green-2: #4fa587;
  --green-line: #3f7a66;
  --gold-soft: #33291a;
  --gold-line: #5a4a2c;
  --ok: #79d0a2;
  --ok-fill: #2f7d5b;
  --ok-soft: #14332a;
  --bad: #f19a8d;
  --bad-fill: #b5473a;
  --bad-soft: #3a1f1b;
  --warn-soft: #2f2515;
  --warn-line: #54421f;
  --warn-ink: #e8c98a;
  --mark: #7a6420;
  --paper-warm: #141f22;
  --paper-warm-2: #1a282b;
  --paper-warm-line: #263538;
  --reader-ink: #dfe6e2;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.22);
  --shadow-lg: 0 2px 6px rgba(0, 0, 0, 0.35), 0 24px 60px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.6 var(--body);
}
aside {
  background: var(--navy);
  color: var(--on-navy);
  width: 235px;
  position: fixed;
  inset: 0 auto 0 0;
  padding: 37px 24px;
  display: flex;
  flex-direction: column;
}
.brand {
  font-family: var(--display);
  font-weight: 750;
  font-size: 31px;
  text-decoration: none;
  color: var(--on-navy);
  letter-spacing: -1.3px;
}
.symbol {
  font-size: 30px;
  color: var(--gold);
  margin-right: 10px;
}
.gold {
  color: var(--gold);
}
.eyebrow {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--on-navy-muted);
  margin: 9px 0 39px;
}
nav {
  display: grid;
  gap: 9px;
}
nav a {
  color: var(--on-navy-muted);
  text-decoration: none;
  border-radius: 9px;
  padding: 12px 15px;
  font-size: 14px;
}
nav a.active {
  background: var(--navy-3);
  color: var(--on-navy);
  box-shadow: inset 3px 0 var(--gold);
}
nav a:hover {
  background: var(--navy-2);
}
.navicon {
  margin-right: 14px;
  font-size: 18px;
}
.sidebottom {
  margin-top: auto;
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 13px;
}
.avatar {
  background: var(--navy-3);
  border: 1px solid var(--navy-line);
  color: var(--gold-light);
  border-radius: 50%;
  padding: 8px 15px;
}
small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}
.sidebottom small {
  color: var(--on-navy-muted);
}
main {
  max-width: 1600px;
  margin-left: 235px;
  padding: 30px 48px;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 35px;
}
.badge,
.tag {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 6px 11px;
  border-radius: 5px;
  background: var(--soft-2);
  color: var(--green);
}
.badge {
  border: 1px solid var(--line);
}
h1,
h2 {
  font-family: var(--display);
  text-wrap: balance;
}
h1 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -1.2px;
  line-height: 1.2;
  margin: 8px 0 12px;
}
h2 {
  font-size: 21px;
  letter-spacing: -0.5px;
  margin: 0 0 10px;
}
h3 {
  font-size: 16px;
  margin: 0 0 5px;
}
p {
  margin: 8px 0 18px;
  color: var(--muted);
}
.label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--green);
}
.hero {
  display: grid;
  grid-template-columns: 1fr 190px;
  gap: 20px;
  padding: 30px 35px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 17px;
  position: relative;
  overflow: hidden;
}
.hero p {
  max-width: 560px;
}
.orbit {
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  width: 155px;
  height: 155px;
  display: grid;
  place-content: center;
  text-align: center;
  align-self: center;
  box-shadow: 0 0 0 17px var(--soft),
    0 0 0 18px var(--line-strong);
}
.orbit strong {
  font-size: 44px;
  line-height: 1.1;
  font-weight: 550;
  letter-spacing: -2px;
}
.orbit span {
  font-size: 11px;
  color: var(--muted);
}
button,
.btn {
  font: inherit;
  cursor: pointer;
  border: 0;
  background: var(--btn);
  color: var(--on-btn);
  padding: 10px 17px;
  border-radius: 9px;
  text-decoration: none;
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
}
button:hover,
.btn:hover {
  filter: brightness(1.14);
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}
.secondary {
  background: var(--soft);
  color: var(--ink);
  border: 1px solid var(--line);
}
.textbtn {
  background: none;
  color: var(--green);
  padding: 5px;
  font-size: 12px;
}
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 17px;
  margin: 24px 0;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 23px;
  box-shadow: var(--shadow);
}
.stat strong {
  font-size: 30px;
  display: block;
  font-weight: 550;
  letter-spacing: -1px;
}
.stat span {
  color: var(--muted);
  font-size: 12px;
}
.stat small {
  margin-top: 5px;
}
.grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 22px;
}
.row {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  align-items: center;
}
.section {
  margin-top: 26px;
}
.progress {
  height: 6px;
  border-radius: 10px;
  background: var(--soft);
  overflow: hidden;
  margin: 13px 0;
}
.progress i {
  display: block;
  height: 100%;
  background: var(--green);
  border-radius: 10px;
}
.task {
  display: flex;
  gap: 12px;
  border-top: 1px solid var(--line);
  padding: 15px 0;
  align-items: flex-start;
}
.task:last-child {
  padding-bottom: 0;
}
input[type='checkbox'] {
  accent-color: var(--green);
  width: 18px;
  height: 18px;
  margin-top: 5px;
  flex-shrink: 0;
}
.task label {
  cursor: pointer;
  flex: 1;
  font-size: 14px;
}
.task.done label {
  text-decoration: line-through;
  color: var(--faint);
}
.pill {
  display: inline-block;
  font-size: 10px;
  color: var(--green);
  background: var(--soft);
  border-radius: 20px;
  padding: 3px 9px;
}
.muted {
  color: var(--muted);
}
.timer {
  font-size: 66px;
  letter-spacing: -3px;
  line-height: 1.3;
  font-variant-numeric: tabular-nums;
  margin: 20px 0;
}
.focuscard {
  text-align: center;
  background: var(--navy);
  color: var(--on-navy);
}
.focuscard p,
.focuscard small {
  color: var(--on-navy-muted);
}
.focuscard button {
  background: var(--gold);
  color: var(--on-gold);
}
.focuscard .secondary {
  background: var(--navy-3);
  color: var(--on-navy);
  border: 0;
}
.chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 18px 0;
}
.chips button {
  background: var(--surface);
  color: var(--muted);
  border: 1px solid var(--line);
}
.chips .selected {
  background: var(--btn);
  color: var(--on-btn);
}
.topics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
details summary {
  cursor: pointer;
  list-style: none;
}
details > summary:after {
  content: '+';
  float: right;
  color: var(--green);
  font-size: 22px;
}
details[open] > summary:after {
  content: '−';
}
textarea,
select,
input[type='number'],
input[type='search'] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 10px;
  background: var(--surface-2);
  color: var(--ink);
  font: inherit;
}
textarea {
  resize: vertical;
  min-height: 85px;
  font-size: 13px;
  margin-top: 10px;
}
.book {
  border-bottom: 1px solid var(--line);
  padding: 17px 0;
}
.book:last-child {
  border: 0;
}
.book a {
  color: var(--green);
}
.empty {
  text-align: center;
  padding: 65px 25px;
}
.empty .bigicon {
  font-size: 48px;
  color: var(--green);
}
.week {
  display: grid;
  grid-template-columns: 145px 1fr;
  gap: 20px;
  margin-bottom: 14px;
}
.week.current {
  border-color: var(--green-line);
  background: var(--surface-2);
}
.week time {
  font-weight: 650;
  color: var(--green);
}
.week p {
  font-size: 13px;
  margin-bottom: 5px;
}
.heatmap {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  margin: 18px 0;
}
.day {
  height: 24px;
  width: 24px;
  border-radius: 4px;
  background: var(--soft);
}
.day.on {
  background: var(--green-2);
}
.notice {
  padding: 13px 18px;
  background: var(--warn-soft);
  border: 1px solid var(--warn-line);
  border-radius: 8px;
  font-size: 12px;
  color: var(--warn-ink);
}
.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
footer {
  font-size: 11px;
  color: var(--muted);
  margin-top: 40px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
#toast {
  position: fixed;
  bottom: 25px;
  right: 25px;
  background: var(--navy);
  color: var(--on-navy);
  padding: 13px 20px;
  border-radius: 10px;
  display: none;
  z-index: 5;
  max-width: 90vw;
}
.review {
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}
.review button {
  float: right;
}
.metric-note {
  font-size: 11px;
  color: var(--muted);
}
@media (min-width: 1450px) {
  main {
    padding: 35px 65px;
  }
}
@media (max-width: 1000px) {
  aside {
    width: 195px;
    padding: 25px 15px;
  }
  main {
    margin-left: 195px;
    padding: 25px;
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid {
    grid-template-columns: 1fr;
  }
  .topics {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 650px) {
  aside {
    position: static;
    width: 100%;
    padding: 18px 20px;
  }
  .brand {
    font-size: 25px;
  }
  .eyebrow,
  .sidebottom {
    display: none;
  }
  nav {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 4px;
    margin-top: 12px;
  }
  nav a {
    padding: 8px 4px;
    white-space: nowrap;
    font-size: 11.5px;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  nav a.active {
    box-shadow: inset 0 -3px var(--gold);
  }
  .navicon {
    display: none;
  }
  main {
    margin: 0;
    padding: 20px;
  }
  header {
    font-size: 10px;
    gap: 10px;
    margin-bottom: 22px;
  }
  .badge {
    font-size: 8px;
  }
  h1 {
    font-size: 29px;
  }
  .hero {
    padding: 23px;
    grid-template-columns: 1fr;
  }
  .orbit {
    display: none;
  }
  .card {
    padding: 19px;
  }
  .stats {
    gap: 10px;
  }
  .week {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .timer {
    font-size: 58px;
  }
}
.lesson {
  max-width: 940px;
}
.lesson h2 {
  margin: 18px 0;
}
.lesson h3 {
  margin-top: 28px;
}
.lesson p {
  font-size: 16px;
  line-height: 1.8;
}
.formula {
  background: var(--soft);
  border-left: 4px solid var(--green-line);
  padding: 20px;
  margin: 24px 0;
  font-family: ui-monospace, monospace;
  line-height: 1.8;
  overflow-wrap: anywhere;
}
.examfilters {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
}
.exampage {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  display: block;
  background: white;
}
.answerbox {
  background: var(--surface-2);
  padding: 22px;
  margin: 20px 0;
  border-radius: 12px;
}
.pagecontrols {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin: 20px 0;
}
.pagecontrols select {
  width: 70px;
  display: inline-block;
}
.topics button {
  margin-top: 14px;
}
.book .textbtn {
  margin-right: 14px;
}
.lesson textarea {
  margin-top: 10px;
}
button:disabled {
  opacity: 0.45;
  cursor: default;
}
@media (max-width: 650px) {
  .examfilters {
    grid-template-columns: 1fr;
  }
  .pagecontrols {
    flex-wrap: wrap;
  }
  .lesson p {
    font-size: 15px;
  }
  .answerbox {
    padding: 14px;
  }
  .formula {
    padding: 12px;
  }
}

.label.gold {
  color: var(--gold);
}
details > summary::-webkit-details-marker {
  display: none;
}
#app h1:focus {
  outline: none;
}
.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  z-index: 10;
  background: var(--gold);
  color: var(--on-gold);
  padding: 8px 14px;
  border-radius: 6px;
  font-weight: 700;
}
.skip:focus {
  left: 8px;
}
.stat .progress.goal i {
  background: var(--gold);
}
label > input[type='search'],
label > select {
  margin-top: 6px;
  display: block;
}