/* Alt Academy — rules Webflow's style panel cannot express.
   Paste into: Page Settings -> Custom Code -> Inside <head> tag, wrapped in <style>. */

:root {
  --paper: #f4f5f6;
  --paper-warm: #fafbfc;
  --paper-deep: #eaebed;
  --white: #ffffff;
  --ink: #1A141F;
  --ink-2: #1a1226;
  --muted: #5d5866;
  --line: #dcdfe5;
  --line-dark: rgba(255, 255, 255, .18);
  --raspberry: #ce1257;
  --raspberry-dark: #a90f47;
  --accent: #ce1257;
  --accent-dark: #a90f47;
  --chem-bright: #d7ec12;
  --success: #244f36;
  --mono: "Inter", sans-serif;
  --sans: "Inter", sans-serif;
  --serif: "Newsreader", Georgia, serif;
  --frame: 100%;
  --max: 1400px;
  --header-height: 66px;
  --shadow: 0 24px 70px rgba(26, 20, 31, .16);
  --chemistry: #c3d809;
  --chemistry-soft: #f7fadf;
  --physics: #bb1450;
  --physics-soft: #fde8f0;
  --biology: #1c7a40;
  --biology-soft: #e8f7ec;
  --mathematics: #00a4f5;
  --mathematics-soft: #e3f6fe;
  --business: #be4e92;
  --business-soft: #f9edf4;
  --economics: #2ba893;
  --economics-soft: #e0f4f0;
  --accounting: #7b5ce0;
  --accounting-soft: #eee9fb;
  --psychology: #bc76d6;
  --psychology-soft: #f3e8f7;
  --computing: #ec6550;
  --computing-soft: #fbeee9;
  --islamiyat: #636b2f;
  --islamiyat-soft: #f3f4e7;
  --bg: #F4F5F6;
  --soft: #5a5465;
  --rule: #E0E1E3;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

body.cart-open {
  overflow: hidden;
}

input, select {
  color: inherit;
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--raspberry);
  outline-offset: 3px;
}

.sub-eyebrow::before {
  content: "Ch";
  display: inline-grid;
  width: 24px;
  height: 24px;
  margin-right: 10px;
  place-items: center;
  border: 1px solid currentColor;
  font-size: 9px;
  letter-spacing: 0;
  vertical-align: -6px;
}

.sub-desktop-nav a::after, .sign-in::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  background: var(--raspberry);
  transition: transform .2s ease;
}

.sub-desktop-nav a:hover::after, .sign-in:hover::after {
  transform: scaleX(1);
}

.mobile-menu {
  display: none;
}

.chem-hero::before, .chem-hero::after {
  position: absolute;
  z-index: 0;
  color: rgba(26, 18, 38, .11);
  font: 500 clamp(26px, 3.5vw, 58px)/1 var(--mono);
  pointer-events: none;
}

.chem-hero::before {
  content: "n = m / M";
  top: 19%;
  right: -30px;
  transform: rotate(90deg);
}

.chem-hero::after {
  content: "⇌  ΔH  e⁻";
  bottom: 110px;
  left: 18px;
  transform: rotate(-90deg);
}

.course-player {
  position: relative;
  border: 1px solid var(--ink);
  background: var(--white);
}

.mini-rail li.is-current {
  margin-inline: -18px;
  padding-inline: 24px;
  border-color: var(--ink);
  color: var(--chem-dark);
  background: var(--chem);
}

.hero-lesson::after {
  position: absolute;
  right: 22px;
  bottom: 48px;
  content: "104.3°";
  color: rgba(42, 46, 5, .26);
  font: 500 13px/1 var(--mono);
}

.structure {
  display: grid;
  align-items: center;
  justify-content: center;
}

.structure--lattice span:nth-child(2), .structure--lattice span:nth-child(3) {
  color: var(--white);
  background: var(--ink);
}

.structure--molecule i::before, .structure--molecule i::after {
  position: absolute;
  width: 20px;
  height: 2px;
  content: "";
  background: var(--ink);
}

.structure--molecule i::before {
  left: -20px;
}

.structure--molecule i::after {
  right: -20px;
}

.lesson-sequence .is-current {
  color: var(--chem-dark);
  background: var(--chem);
}

.course-studio::after {
  position: absolute;
  top: 110px;
  right: 4%;
  z-index: 0;
  content: "6.02 × 10²³";
  color: rgba(26, 18, 38, .055);
  font: 500 clamp(60px, 10vw, 170px)/1 var(--mono);
  white-space: nowrap;
  pointer-events: none;
}

.course-tile.is-selected {
  color: var(--white);
  background: var(--ink);
  box-shadow: 7px 7px 0 var(--chem);
}

.course-tile > span:nth-child(2) {
  display: grid;
  gap: 5px;
}

.course-tile.is-selected em {
  color: #50570a;
}

.course-player {
  box-shadow: var(--shadow);
}

.course-player__rail li.is-current {
  margin-right: -1px;
  border-color: var(--ink);
  color: var(--chem-dark);
  background: var(--chem);
}

.course-player__rail li.is-current > span, .course-player__rail li.is-current small {
  color: var(--chem-dark);
}

.lesson-video::before {
  position: absolute;
  inset: 0;
  content: "";
  opacity: .28;
  background-image: radial-gradient(var(--ink) .75px, transparent .75px);
  background-size: 14px 14px;
}

.video-label {
  position: absolute;
  top: 14px;
  left: 15px;
  z-index: 2;
  padding: 7px 9px;
  color: var(--white);
  background: var(--ink);
  font: 500 9px/1 var(--mono);
  letter-spacing: .06em;
}

.course-player__steps {
  display: grid;
  margin-top: 14px;
  grid-template-columns: repeat(4, 1fr);
}

.course-player__steps button {
  min-height: 54px;
  border: 1px solid var(--ink);
  border-right: 0;
  background: var(--white);
  font: 500 9px/1 var(--mono);
}

.course-player__steps button span {
  display: block;
  margin-bottom: 5px;
  color: var(--raspberry);
}

.course-player__steps button.is-current {
  color: var(--chem-dark);
  background: var(--chem);
}

.student-proof__heading .sub-eyebrow {
  color: var(--raspberry);
}

.student-proof blockquote::after {
  position: absolute;
  right: 22px;
  bottom: 16px;
  content: var(--subject-symbol, "");
  font: 400 72px/1 var(--serif);
  opacity: .08;
}

.question-method::before {
  position: absolute;
  top: 15%;
  left: -35px;
  content: "⇌";
  color: rgba(206, 18, 87, .08);
  font: 400 210px/1 var(--serif);
}

.method-tabs button.is-selected {
  color: var(--white);
  background: var(--ink);
}

.method-tabs button.is-selected span, .method-tabs button.is-selected small {
  color: var(--white);
}

.method-stage::after {
  position: absolute;
  right: 24px;
  bottom: 22px;
  content: "9701";
  color: rgba(42, 46, 5, .09);
  font: 500 62px/1 var(--mono);
}

.method-stage article > p:not(.method-index) {
  max-width: 550px;
  color: var(--muted);
  font-size: 16px;
}

.command-strip .is-current, .idea-map .is-current {
  color: var(--white);
  background: var(--raspberry);
}

.question-card > p:nth-of-type(1) {
  margin: 35px 0;
  font: 400 28px/1.1 var(--serif);
}

.course-map::after {
  position: absolute;
  right: -40px;
  bottom: 40px;
  content: "sp³";
  color: rgba(26, 18, 38, .045);
  font: italic 400 240px/1 var(--serif);
}

.route-switch button.is-selected {
  color: var(--white);
  background: var(--ink);
}

.route-switch button.is-selected small {
  color: #5f6710;
}

.route-panel {
  position: relative;
  z-index: 1;
  display: grid;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
  background: var(--white);
  grid-template-columns: minmax(300px, .48fr) 1fr;
}

.route-intro::after {
  position: absolute;
  right: 28px;
  bottom: 20px;
  content: "→";
  color: var(--chem);
  font: 400 72px/1 var(--serif);
}

.topic-list details {
  border-bottom: 1px solid var(--ink);
}

.topic-list summary {
  display: grid;
  min-height: 100px;
  padding: 22px 30px;
  grid-template-columns: 48px 1fr auto 30px;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  list-style: none;
}

.topic-list summary::-webkit-details-marker {
  display: none;
}

.topic-list summary > span {
  color: var(--raspberry);
  font: 600 9px/1 var(--mono);
}

.topic-list summary strong {
  font: 500 28px/1 var(--serif);
}

.topic-list summary small {
  color: var(--muted);
  font-size: 12px;
}

.topic-list summary i {
  position: relative;
  width: 20px;
  height: 20px;
}

.topic-list summary i::before, .topic-list summary i::after {
  position: absolute;
  top: 50%;
  left: 0;
  width: 18px;
  height: 1px;
  content: "";
  background: var(--ink);
}

.topic-list summary i::after {
  transform: rotate(90deg);
  transition: transform .2s ease;
}

.topic-list details[open] summary {
  color: var(--ink);
  background: var(--paper);
}

.topic-list details[open] summary i::after {
  transform: rotate(0);
}

.topic-list details > div {
  display: grid;
  padding: 20px 30px 30px 94px;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 28px;
}

.topic-list details > div p {
  margin: 0;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.teacher-section::after {
  position: absolute;
  right: -35px;
  bottom: -65px;
  content: "C₆H₆";
  color: rgba(195, 216, 9, .055);
  font: 400 clamp(120px, 18vw, 310px)/1 var(--serif);
}

.teacher-copy > p:not(.sub-eyebrow):not(.paper-five-note) {
  max-width: 670px;
  margin: 28px 0;
  color: #c9c5cc;
  font-size: 17px;
}

.pricing-studio::before {
  position: absolute;
  top: 80px;
  right: 20px;
  content: "[Ar] 4s²";
  color: rgba(26, 18, 38, .045);
  font: 500 clamp(55px, 8vw, 130px)/1 var(--mono);
}

.plan-guide fieldset button.is-selected, .card-toggle button.is-selected {
  color: var(--white);
  background: var(--ink);
}

.plan-guide fieldset.is-muted {
  opacity: .35;
}

.plan-guide fieldset.is-muted button {
  cursor: not-allowed;
}

.price-card.is-recommended {
  z-index: 2;
  box-shadow: 8px 8px 0 var(--ink);
  transform: translateY(-5px);
}

.price-card.is-recommended .price-card__bar {
  color: var(--white);
  background: var(--ink);
}

.price-card:not(.is-recommended) .recommendation-flag {
  display: none;
}

.price-card li::before {
  position: absolute;
  top: 17px;
  left: 0;
  width: 7px;
  height: 7px;
  content: "";
  border: 1px solid var(--raspberry);
}

.live-plan.is-recommended {
  outline: 3px solid var(--raspberry);
  outline-offset: 4px;
}

.live-plan:not(.is-recommended) .recommendation-flag {
  display: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary i::before, .faq-list summary i::after {
  position: absolute;
  top: 50%;
  left: 0;
  width: 18px;
  height: 1px;
  content: "";
  background: var(--ink);
}

.faq-list summary i::after {
  transform: rotate(90deg);
  transition: transform .2s ease;
}

.faq-list details[open] summary i::after {
  transform: none;
}

.final-cta::after {
  position: absolute;
  right: 5%;
  bottom: -60px;
  content: "OH⁻";
  color: rgba(255, 255, 255, .08);
  font: 400 210px/1 var(--serif);
}

.sub-cart-drawer.is-open {
  transform: none;
}

.sub-preview-dialog::backdrop {
  background: rgba(26, 18, 38, .72);
  backdrop-filter: blur(5px);
}

.sub-preview-dialog > p:not(.sub-eyebrow) {
  color: var(--muted);
}

.sub-eyebrow::before {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  margin-right: 0;
  border: 0;
  border-radius: 0;
  background: currentColor;
  color: inherit;
  font-size: 0;
  content: "";
  vertical-align: 0;
}

.eyebrow--light::before {
  background: currentColor;
}

.course-player, .route-panel {
  border-color: var(--line);
  border-radius: 2px;
}

.course-tile.is-selected {
  border-color: var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
}

.course-player {
  box-shadow: none;
}

.course-player__steps button, .topic-list details, .topic-list summary {
  border-color: var(--line);
}

.student-proof__heading .sub-eyebrow {
  color: var(--raspberry);
}

.route-panel, .topic-list details[open] summary {
  background-color: var(--white);
}

.price-card.is-recommended {
  box-shadow: 4px 4px 0 var(--ink);
  transform: translateY(-3px);
}

@media (max-width: 1240px) {
  .mobile-menu {
    position: fixed;
    z-index: 79;
    top: 52px;
    right: 0;
    left: 0;
    display: grid;
    max-height: calc(100dvh - 52px);
    padding: 22px 28px;
    overflow: auto;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
  }
  .mobile-menu a {
    display: flex;
    min-height: 58px;
    padding: 0;
    align-items: center;
    justify-content: space-between;
    border: 0;
    border-bottom: 1px solid var(--line);
    background: transparent;
    font: 500 18px/1 var(--serif);
  }
  .question-card > p:nth-of-type(1) {
    margin: 0;
  }
}

@media (max-width: 940px) {
  .sub-header-actions .sign-in, .sub-header-actions .header-cta {
    display: none;
  }
  .route-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  body {
    font-size: 15px;
  }
  .sub-header-actions .cart-button {
    display: none;
  }
  .mobile-menu {
    top: 52px;
    max-height: calc(100dvh - 52px);
  }
  .chem-hero::before, .chem-hero::after {
    display: none;
  }
  .structure--molecule i::before, .structure--molecule i::after {
    width: 12px;
  }
  .structure--molecule i::before {
    left: -12px;
  }
  .structure--molecule i::after {
    right: -12px;
  }
  .course-player {
    box-shadow: 6px 6px 0 var(--ink);
  }
  .course-player__steps button {
    font-size: 7px;
  }
  .question-card > p:nth-of-type(1) {
    margin: 28px 0;
  }
  .topic-list summary {
    min-height: 90px;
    padding: 18px;
    grid-template-columns: 31px 1fr 22px;
  }
  .topic-list summary small {
    display: none;
  }
  .topic-list summary strong {
    font-size: 23px;
  }
  .topic-list details > div {
    padding: 15px 18px 25px 49px;
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

body.menu-locked {
  overflow: hidden;
}

.chem-hero::before, .chem-hero::after, .course-studio::after, .question-method::before, .course-map::after, .pricing-studio::before, .teacher-section::after, .final-cta::after {
  display: none !important;
}

.sub-site-header .sub-desktop-nav a::after, .sub-site-header .sub-sign-in-link::after {
  content: none;
}

.sub-nav-trigger[aria-expanded="true"] {
  color: var(--accent);
}

.sub-nav-trigger[aria-expanded="true"] .sub-nav-chevron {
  transform: translateY(2px) rotate(225deg);
}

.sub-desktop-scrim.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.sub-more-card:nth-child(2n) {
  border-right: 0;
}

.sub-more-card:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.sub-alt-site-header-menu-button-menu-icon::before, .sub-alt-site-header-menu-button-menu-icon::after {
  position: absolute;
  left: 0;
  display: block;
  width: 18px;
  height: 1.5px;
  background: currentColor;
  content: "";
  transform: none;
}

.sub-alt-site-header-menu-button-menu-icon::before {
  top: 0;
}

.sub-alt-site-header-menu-button-menu-icon::after {
  top: 10px;
}

.sub-drawer-close::before, .sub-drawer-close::after {
  position: absolute;
  width: 17px;
  height: 1.5px;
  background: currentColor;
  content: "";
}

.sub-drawer-close::before {
  transform: rotate(45deg);
}

.sub-drawer-close::after {
  transform: rotate(-45deg);
}

.sub-mobile-plus::before, .sub-mobile-plus::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 14px;
  height: 1px;
  background: var(--ink);
  content: "";
  transform: translate(-50%, -50%);
}

.sub-mobile-plus::after {
  transform: translate(-50%, -50%) rotate(90deg);
  transition: transform 150ms ease;
}

.sub-mobile-accordion__button[aria-expanded="true"] .sub-mobile-plus::after {
  transform: translate(-50%, -50%);
}

.sub-footer-cta .sub-eyebrow::before {
  content: "Ch";
  width: 24px;
  height: 24px;
  background: transparent;
}

.sub-footer-brand .brand__mark {
  color: var(--ink);
  background: var(--white);
}

.sub-footer-brand .brand__wordmark {
  color: var(--white);
}

.sub-footer-group summary::-webkit-details-marker {
  display: none;
}

@media (max-width: 1099px) {
  .sub-mobile-backdrop.is-open {
    display: block;
  }
  .sub-mobile-drawer.is-open {
    display: flex;
  }
}

@media (max-width: 767px) {
  .sub-footer-group summary::before, .sub-footer-group summary::after {
    position: absolute;
    top: 50%;
    right: 20px;
    width: 13px;
    height: 1px;
    background: rgba(255, 255, 255, .7);
    content: "";
    transform: translateY(-50%);
  }
  .sub-footer-group summary::after {
    transform: translateY(-50%) rotate(90deg);
    transition: transform 140ms ease;
  }
  .sub-footer-group[open] summary::after {
    transform: translateY(-50%);
  }
}

.v2 .frame {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}

.sub-v2-eye::before {
  content: '';
  display: block;
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--chem);
}

.sub-v2-win-video iframe, .sub-v2-win-video video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.sub-v2-win-video-placeholder small {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(255,255,255,.4);
}

.v2-chapter-rail {
  border-right: 1.5px solid var(--rule);
  background: var(--white);
}

.v2-chapter-scroll::-webkit-scrollbar {
  width: 5px;
}

.v2-chapter-scroll::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: 4px;
}

.v2-chapter-list {
  display: flex;
  flex-direction: column;
}

.v2-chapter-list[hidden] {
  display: none;
}

.v2-chap-group {
  border-bottom: 1px solid var(--rule);
}

.v2-chap-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  text-align: left;
  background: transparent;
  border: none;
  width: 100%;
  cursor: pointer;
  transition: background .12s;
}

.v2-chap-head .cn {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--chem-mid);
  flex-shrink: 0;
  min-width: 20px;
}

.v2-chap-head .ct {
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink);
  flex: 1;
  line-height: 1.3;
}

.v2-chap-head .c-count {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--soft);
  flex-shrink: 0;
}

.v2-chap-head .c-chevron {
  font-size: 9px;
  color: var(--soft);
  flex-shrink: 0;
  transition: transform .15s;
}

.v2-chap-group.is-open > .v2-chap-head .c-chevron {
  transform: rotate(90deg);
}

.v2-chap-group.is-open > .v2-chap-head {
  background: var(--bg);
}

.v2-chap-group.is-active > .v2-chap-head {
  background: var(--chem-pale);
  border-left: 3px solid var(--chem);
  padding-left: 13px;
}

.v2-chap-group.is-active > .v2-chap-head .cn {
  color: var(--chem-dark);
}

.v2-chap-group.is-active > .v2-chap-head .ct {
  color: var(--chem-dark);
}

.v2-lesson-list {
  display: none;
  flex-direction: column;
  background: var(--bg);
  border-top: 1px solid var(--rule);
}

.v2-chap-group.is-open > .v2-lesson-list {
  display: flex;
}

.v2-lesson-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 9px 16px 9px 28px;
  text-align: left;
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(0,0,0,.04);
  cursor: pointer;
  transition: background .1s;
  width: 100%;
}

.v2-lesson-item .l-code {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--soft);
  flex-shrink: 0;
  min-width: 26px;
  margin-top: 2px;
}

.v2-lesson-item .l-title {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink);
  line-height: 1.4;
  flex: 1;
}

.v2-lesson-item .l-quiz {
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--chem-mid);
  background: var(--chem-pale);
  padding: 2px 5px;
  border-radius: 3px;
  flex-shrink: 0;
  margin-top: 1px;
}

.v2-lesson-item.is-selected {
  background: var(--chem-pale);
}

.v2-lesson-item.is-selected .l-title {
  font-weight: 600;
  color: var(--chem-dark);
}

.v2-lesson-item.is-selected .l-code {
  color: var(--chem-dark);
}

.v2-assess-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px 7px 28px;
  border-top: 1px solid rgba(0,0,0,.06);
}

.v2-assess-row .a-label {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--soft);
}

.v2-assess-row .a-kind {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--white);
  background: var(--ink);
  padding: 1px 5px;
  border-radius: 3px;
}

.v2-assess-row .a-kind.diag {
  background: var(--chem-mid);
}

.v2-chap-group.is-locked > .v2-chap-head .ct {
  color: var(--soft);
}

.v2-chap-group.is-locked > .v2-chap-head .cn {
  color: var(--rule);
}

.c-lock {
  font-size: 11px;
  opacity: .4;
}

.is-locked-item {
  opacity: .4;
  pointer-events: none;
}

.v2-lock-cta {
  display: block;
  padding: 12px 28px;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  color: var(--white);
  background: var(--ink);
  text-decoration: none;
  text-align: center;
  transition: background .12s;
}

.v2-lock-cta span {
  margin-left: 4px;
}

.v2-lesson-player {
  display: flex;
  flex-direction: column;
  min-height: 560px;
}

.v2-lp-badge {
  background: var(--chem);
  color: var(--ink);
  padding: 3px 8px;
  font-size: 10px;
  font-weight: 700;
  flex-shrink: 0;
}

.v2-lp-path {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.v2-lp-pos {
  flex-shrink: 0;
}

.v2-lp-quiz-link {
  flex-shrink: 0;
  color: var(--ink);
  cursor: pointer;
}

.v2-lp-body {
  display: flex;
  flex: 1;
  overflow-y: auto;
}

.v2-lp-steps {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 32px 0;
  width: 48px;
  flex-shrink: 0;
  border-right: 1px solid var(--rule);
}

.v2-lp-step {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--soft);
  background: var(--bg);
  border: 2px solid var(--rule);
  margin-bottom: 8px;
}

.v2-lp-step.is-active {
  background: var(--chem);
  border-color: var(--chem);
  color: var(--ink);
}

.v2-lp-content {
  flex: 1;
  padding: 36px 40px;
  position: relative;
}

.v2-lp-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--soft);
  margin-bottom: 10px;
}

.v2-lp-code {
  background: var(--chem);
  color: var(--ink);
  padding: 2px 7px;
  font-size: 10px;
  margin-left: 6px;
}

.v2-lp-title {
  font-family: var(--serif) !important;
  font-size: clamp(22px, 2.5vw, 32px) !important;
  font-weight: 500 !important;
  line-height: 1.15 !important;
  color: var(--ink);
  margin: 0 0 32px;
}

.v2-lp-micro {
  margin-bottom: 16px;
}

.v2-lp-micro-tag {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--chem-mid);
  background: var(--chem-pale);
  padding: 3px 8px;
  display: inline-block;
  margin-bottom: 8px;
}

.v2-lp-micro-title {
  font-family: var(--serif) !important;
  font-size: 20px !important;
  font-weight: 500 !important;
  color: var(--ink);
  margin: 0;
}

.v2-lp-goals {
  border-left: 3px solid var(--chem);
  padding: 16px 20px;
  margin-bottom: 28px;
  background: var(--bg);
}

.v2-lp-goals-list {
  margin: 0;
  padding: 0 0 0 20px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--soft);
  line-height: 1.65;
}

.v2-lp-goals-list li {
  margin-bottom: 6px;
}

.v2-lp-goals-list li::marker {
  font-weight: 700;
  color: var(--chem-mid);
}

.v2-lp-video {
  border: 1px solid var(--rule);
  overflow: hidden;
}

.v2-lp-locked {
  position: absolute;
  inset: 0;
  background: rgba(244,245,246,.96);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px;
}

.v2-lp-locked[hidden] {
  display: none;
}

.v2-lp-locked h3 {
  font-family: var(--serif) !important;
  font-size: 22px !important;
  font-weight: 500 !important;
  color: var(--ink);
  margin: 0 0 10px;
}

.v2-lp-locked p {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--soft);
  margin: 0 0 24px;
  max-width: 320px;
}

.sub-v2-tab.is-active {
  color: var(--ink);
  border-bottom-color: var(--chem);
}

.v2-panel.is-active {
  display: block;
}

.v2-rail-ol li .n {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--chem-mid);
  flex-shrink: 0;
  margin-top: 1px;
}

.v2-lesson h3 {
  font-family: var(--serif) !important;
  font-size: clamp(20px, 2.5vw, 28px) !important;
  font-weight: 500 !important;
  line-height: 1.25 !important;
  color: var(--ink);
  margin: 0 0 20px;
}

.v2-step {
  flex: 1;
  padding: 14px 16px;
  text-align: center;
  border-right: 1px solid var(--rule);
  border-top: 1.5px solid var(--rule);
  border-bottom: 1.5px solid var(--rule);
}

.v2-step.v2-active {
  background: var(--chem);
  border-color: var(--chem);
}

.v2-step .sn {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--soft);
  margin-bottom: 3px;
}

.v2-step.v2-active .sn {
  color: var(--chem-dark);
}

.v2-step .sl {
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink);
}

.v2-step.v2-active .sl {
  color: var(--chem-dark);
}

.sub-v2-method + .sub-v2-teacher {
  margin-top: 0;
}

.sub-v2-mnav.is-active {
  background: var(--ink);
  border-color: var(--ink);
}

.sub-v2-mnav.is-active .sub-alt-v2-mnav-mn {
  color: var(--chem);
}

.sub-v2-mnav.is-active .sub-alt-v2-mnav-strong {
  color: var(--white);
}

.sub-v2-mnav.is-active .sub-alt-v2-mnav-small {
  color: rgba(255,255,255,.45);
}

.sub-v2-mdetail.is-visible {
  display: block;
}

.v2-map-panel.is-active {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 56px;
}

.v2-topics summary::-webkit-details-marker {
  display: none;
}

.v2-topics summary .tn {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--chem-mid);
  flex-shrink: 0;
}

.v2-topics summary::after {
  content: '+';
  font-family: var(--mono);
  font-size: 16px;
  color: var(--soft);
  flex-shrink: 0;
  margin-left: 8px;
}

.v2-topics details[open] summary::after {
  content: '−';
}

.sub-v2-eye--light::before {
  background: var(--chem);
}

.sub-v2-card ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--chem-mid);
}

.sub-v2-card--dark ul li::before {
  color: var(--chem);
}

.sub-v2-sitting-btn.is-active {
  background: var(--chem);
  border-color: var(--chem);
  color: var(--ink);
}

.sub-v2-sitting-btn:hover:not(.is-active) {
  border-color: rgba(255,255,255,.5);
  color: var(--white);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: .35; }
}

.sub-alt-v2-faq-list-summary::-webkit-details-marker {
  display: none;
}

.sub-alt-v2-faq-list-summary::after {
  content: '+';
  font-family: var(--mono);
  font-size: 18px;
  color: var(--soft);
  flex-shrink: 0;
}

.sub-alt-v2-faq-list-details[open] .sub-alt-v2-faq-list-summary::after {
  content: '−';
}

.v2-player-main {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(220px, 250px) minmax(0, 1fr);
  overflow: hidden;
  border: 1.5px solid var(--rule);
  background: var(--white);
  box-shadow: 8px 8px 0 var(--ink);
}

.v2-chapter-rail, .v2-lesson-player, .v2-player-proof, .v2-player-main {
  min-width: 0;
}

.v2-lesson-player {
  min-height: 620px;
  border-right: 0;
}

.v2-lp-steps {
  width: auto;
  min-height: 54px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: stretch;
  border-right: 0;
  border-bottom: 1px solid var(--rule);
}

.v2-lp-step {
  width: auto;
  height: auto;
  min-width: 0;
  margin: 0;
  padding: 8px 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 0;
  border-right: 1px solid var(--rule);
  border-bottom: 3px solid transparent;
  color: var(--soft);
  background: #fafbfc;
  cursor: pointer;
}

.v2-lp-step span {
  color: var(--chem-mid);
  font-family: var(--mono);
  font-size: 9px;
}

.v2-lp-step b {
  overflow: hidden;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.v2-lp-step.is-active {
  color: var(--ink);
  border-color: var(--chem);
  background: var(--chem-pale);
}

.v2-lp-body {
  display: block;
  min-width: 0;
  overflow: visible;
}

.v2-lp-content {
  min-width: 0;
  padding: 28px clamp(22px, 3vw, 36px) 34px;
}

.v2-lp-content[hidden], .v2-step-panel[hidden] {
  display: none;
}

.v2-step-panels {
  min-width: 0;
}

.v2-step-panel {
  min-height: 515px;
  padding: clamp(28px, 5vw, 54px);
  display: grid;
  align-content: center;
  background: var(--bg);
}

.v2-step-panel > small {
  color: var(--chem-mid);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .09em;
}

.v2-step-panel h3 {
  max-width: 620px;
  margin: 14px 0 14px;
  color: var(--ink);
  font-family: var(--serif) !important;
  font-size: clamp(27px, 3vw, 38px) !important;
  font-weight: 500 !important;
  line-height: 1.08 !important;
}

.v2-step-panel > p {
  max-width: 600px;
  margin: 0 0 22px;
  color: var(--soft);
  font-size: 14px;
  line-height: 1.6;
}

.v2-step-panel textarea {
  width: 100%;
  min-height: 130px;
  padding: 16px;
  resize: vertical;
  border: 1px solid var(--rule);
  background: var(--white);
  color: var(--ink);
  font: 14px/1.5 var(--sans);
}

.v2-step-panel > button {
  width: fit-content;
  min-height: 42px;
  margin-top: 12px;
  padding: 0 16px;
  border: 1px solid var(--ink);
  background: var(--chem);
  color: var(--ink);
  font: 700 10px/1 var(--mono);
  cursor: pointer;
}

.v2-correction-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 10px;
}

.v2-correction-grid article {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--rule);
  background: var(--white);
}

.v2-correction-grid b {
  color: var(--chem-mid);
  font: 700 9px/1 var(--mono);
}

.v2-correction-grid p {
  margin: 12px 0 0;
  color: var(--soft);
  font-size: 13px;
  line-height: 1.55;
}

.v2-step-lock {
  width: 46px;
  height: 46px;
  margin-bottom: 20px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  background: var(--chem-pale);
  color: var(--ink);
}

.v2-player-proof {
  display: grid;
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 16px;
  align-content: start;
  background: transparent;
}

.v2-proof-card--dark {
  background: var(--ink);
  color: var(--white);
  box-shadow: 6px 6px 0 var(--chem);
}

.v2-proof-card--dark small {
  color: var(--chem);
}

.sub-v2-proof-card strong {
  margin: 14px 0 8px;
  color: var(--chem);
  font: 400 clamp(46px, 5vw, 66px)/.8 var(--serif);
}

.sub-v2-proof-card blockquote {
  margin: 14px 0 18px;
  overflow-wrap: anywhere;
  font: 400 clamp(17px, 1.55vw, 21px)/1.12 var(--serif);
}

.v2-proof-card--dark footer {
  color: rgba(255,255,255,.55);
}

@media (max-width: 1120px) {
  .v2-player-proof {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: none;
    margin-top: 2px;
  }
}

@media (max-width: 760px) {
  .v2-player-main {
    grid-template-columns: minmax(0, 1fr);
    box-shadow: 5px 5px 0 var(--ink);
  }
  .v2-chapter-rail {
    border-right: 0;
    border-bottom: 1.5px solid var(--rule);
  }
  .v2-lesson-player {
    min-height: 0;
  }
  .v2-lp-pos {
    display: none;
  }
  .v2-lp-content {
    padding: 24px 18px 28px;
  }
  .v2-lp-title {
    margin-bottom: 24px;
  }
  .v2-step-panel {
    min-height: 420px;
    padding: 32px 20px;
  }
  .v2-player-proof {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 480px) {
  .v2-lp-step {
    gap: 3px;
    padding-inline: 2px;
  }
  .v2-lp-step span {
    display: none;
  }
  .v2-lp-step b {
    font-size: 9px;
  }
  .v2-lp-quiz-link {
    display: none;
  }
  .v2-correction-grid {
    grid-template-columns: 1fr;
  }
}


body{margin:0;color:#1A141F;background:#f4f5f6;font-family:"Inter", sans-serif;font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased}
button{color:inherit;font:inherit;cursor:pointer}

.trial-route button:disabled{color:#B4B0BA;cursor:not-allowed}
[hidden]{display:none!important}
