:root {
  --rs-tool-bg-colour: #07111d;
  --rs-tool-panel: rgba(10, 24, 38, 0.9);
  --rs-tool-panel-soft: rgba(13, 31, 47, 0.78);
  --rs-tool-border: rgba(196, 224, 232, 0.2);
  --rs-tool-text: #f3f8fa;
  --rs-tool-muted: #c1d0d5;
  --rs-tool-accent: #7dd3c7;
  --rs-tool-accent-strong: #a4e6dc;
  --rs-tool-danger: #ffb4b4;
  --rs-tool-focus: #b9f2ea;
  --rs-tool-toolbar-height: 4rem;
  color-scheme: dark;
}

[hidden] {
  display: none !important;
}

body[data-study-tool] {
  min-width: 0;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--rs-tool-text);
  background: var(--rs-tool-bg-colour) !important;
  font-family: var(--font-sans, Inter, ui-sans-serif, system-ui, sans-serif);
  line-height: 1.5;
}

.rs-tool-backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-color: var(--rs-tool-bg-colour);
  background-image:
    linear-gradient(180deg, rgba(3, 11, 19, 0.88), rgba(5, 15, 25, 0.94)),
    var(--rs-tool-background, none);
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

body[data-study-tool='revise'] { --rs-tool-background: url('/allimages/1000009964-1920.webp'); }
body[data-study-tool='replay'] { --rs-tool-background: url('/allimages/1000009978-1920.webp'); }
body[data-study-tool='revision-plan'] { --rs-tool-background: url('/allimages/1000009969-1920.webp'); }
body[data-study-tool='continue'] { --rs-tool-background: url('/allimages/1000009972-1920.webp'); }
body[data-study-tool='mistakes'] { --rs-tool-background: url('/allimages/1000009968-1920.webp'); }
body[data-study-tool='mastery'] { --rs-tool-background: url('/allimages/1000009967-1920.webp'); }
body[data-study-tool='exam'] { --rs-tool-background: url('/allimages/1000009973-1920.webp'); }
body[data-study-tool='assignments'] { --rs-tool-background: url('/allimages/1000009965-1920.webp'); }
body[data-study-tool='teacher'] { --rs-tool-background: url('/allimages/1000009979-1920.webp'); }

.rs-tool-skip-link {
  position: fixed;
  inset-block-start: 0.45rem;
  inset-inline-start: 0.6rem;
  z-index: 10000;
  padding: 0.65rem 0.85rem;
  border-radius: 0.55rem;
  color: #06131a;
  background: var(--rs-tool-focus);
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-150%);
}

.rs-tool-skip-link:focus {
  transform: translateY(0);
}

.rs-tool-toolbar {
  position: sticky;
  inset-block-start: 0;
  z-index: 900;
  min-height: var(--rs-tool-toolbar-height);
  border-block-end: 1px solid var(--rs-tool-border);
  background: rgba(5, 16, 27, 0.96);
  box-shadow: 0 0.5rem 1.6rem rgba(0, 0, 0, 0.2);
}

.rs-tool-toolbar__inner {
  width: min(92rem, 100%);
  min-height: var(--rs-tool-toolbar-height);
  margin-inline: auto;
  padding-inline: clamp(0.65rem, 2vw, 1.25rem);
  display: flex;
  align-items: center;
  gap: clamp(0.45rem, 1.3vw, 1rem);
}

.rs-tool-toolbar a,
.rs-tool-toolbar button {
  font: inherit;
}

.rs-tool-toolbar__brand {
  flex: 0 0 auto;
  color: var(--rs-tool-text);
  font-weight: 850;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.rs-tool-toolbar__links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  min-width: 0;
}

.rs-tool-toolbar__link,
.rs-tool-toolbar__account,
.rs-tool-toolbar__toggle {
  min-height: 2.75rem;
  border: 1px solid transparent;
  border-radius: 0.65rem;
  padding: 0.55rem 0.68rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  color: var(--rs-tool-muted);
  background: transparent;
  font-weight: 680;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
}

.rs-tool-toolbar__compact {
  display: none;
}

.rs-tool-toolbar__link:hover,
.rs-tool-toolbar__link:focus-visible,
.rs-tool-toolbar__account:hover,
.rs-tool-toolbar__account:focus-visible,
.rs-tool-toolbar__toggle:hover,
.rs-tool-toolbar__toggle:focus-visible {
  color: var(--rs-tool-text);
  border-color: var(--rs-tool-border);
  background: rgba(125, 211, 199, 0.08);
}

.rs-tool-toolbar__link[aria-current='location'] {
  color: var(--rs-tool-accent-strong);
  border-color: rgba(125, 211, 199, 0.32);
  background: rgba(125, 211, 199, 0.1);
}

.rs-tool-toolbar__spacer {
  flex: 1 1 auto;
  min-width: 0;
}

.rs-tool-toolbar__search {
  flex: 0 0 auto;
  min-width: 2.75rem;
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.rs-tool-toolbar__account-wrap {
  position: relative;
  flex: 0 0 auto;
}

.rs-tool-toolbar__account {
  border-color: var(--rs-tool-border);
  color: var(--rs-tool-text);
  background: rgba(255, 255, 255, 0.04);
}

.rs-tool-toolbar__account::after {
  content: '▾';
  font-size: 0.72em;
}

.rs-tool-toolbar__menu {
  position: absolute;
  inset-block-start: calc(100% + 0.45rem);
  inset-inline-end: 0;
  width: min(17rem, calc(100vw - 1.25rem));
  padding: 0.45rem;
  border: 1px solid var(--rs-tool-border);
  border-radius: 0.8rem;
  display: grid;
  gap: 0.15rem;
  background: #0a1b2a;
  box-shadow: 0 1.1rem 2.8rem rgba(0, 0, 0, 0.46);
}

.rs-tool-toolbar__menu a,
.rs-tool-toolbar__menu button {
  width: 100%;
  min-height: 2.75rem;
  border: 0;
  border-radius: 0.55rem;
  padding: 0.62rem 0.7rem;
  color: var(--rs-tool-text);
  background: transparent;
  text-align: start;
  text-decoration: none;
  cursor: pointer;
}

.rs-tool-toolbar__menu a:hover,
.rs-tool-toolbar__menu a:focus-visible,
.rs-tool-toolbar__menu button:hover,
.rs-tool-toolbar__menu button:focus-visible {
  background: rgba(125, 211, 199, 0.11);
}

.rs-tool-toolbar__menu-status {
  margin: 0;
  padding: 0.5rem 0.7rem;
  color: var(--rs-tool-muted);
  font-size: 0.88rem;
}

.rs-tool-toolbar__toggle {
  display: none;
  border-color: var(--rs-tool-border);
}

body[data-study-toolbar-ready] > header:not(.rs-tool-toolbar),
body[data-study-toolbar-ready] > .continue-header,
body[data-study-toolbar-ready] > .top-navigation,
body[data-study-toolbar-ready] > .mastery-topbar,
body[data-study-toolbar-ready] .revise-now-header,
body[data-study-toolbar-ready] .replay-topbar,
body[data-study-toolbar-ready] > .revision-header {
  display: none !important;
}

body[data-study-tool] :focus-visible {
  outline: 3px solid var(--rs-tool-focus) !important;
  outline-offset: 3px;
}

body[data-study-tool] :is(button, input, select, textarea) {
  font: inherit;
}

body[data-study-tool] :is(input, select, textarea) {
  color: var(--rs-tool-text);
  background-color: rgba(5, 18, 30, 0.92);
  border-color: var(--rs-tool-border);
}

body[data-study-tool] :is(button, a, input, select, textarea, summary) {
  scroll-margin-top: calc(var(--rs-tool-toolbar-height) + 1rem);
}

body[data-study-tool] main {
  position: relative;
  z-index: 1;
}

@media (max-width: 64rem) {
  .rs-tool-toolbar__toggle {
    display: inline-flex;
  }

  .rs-tool-toolbar__links {
    position: absolute;
    inset-block-start: calc(100% + 1px);
    inset-inline: 0;
    padding: 0.65rem;
    border-block-end: 1px solid var(--rs-tool-border);
    display: grid;
    background: #071724;
    box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.3);
  }

  .rs-tool-toolbar__links[hidden] {
    display: none !important;
  }

  .rs-tool-toolbar__link {
    justify-content: flex-start;
  }
}

@media (max-width: 28rem) {
  .rs-tool-toolbar__inner {
    gap: 0.35rem;
    padding-inline: 0.5rem;
  }

  .rs-tool-toolbar__full { display: none; }
  .rs-tool-toolbar__compact { display: inline; }
  .rs-tool-toolbar__brand,
  .rs-tool-toolbar__account,
  .rs-tool-toolbar__toggle,
  .rs-tool-toolbar__search {
    width: 2.75rem;
    min-width: 2.75rem;
    max-width: 2.75rem;
    padding-inline: 0;
  }
  .rs-tool-toolbar__brand { min-height: 2.75rem; display: inline-flex; align-items: center; justify-content: center; }
  .rs-tool-toolbar__account::after { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .rs-tool-skip-link,
  .rs-tool-toolbar *,
  .rs-tool-backdrop {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}