* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: #f5f2e9;
}

body.menu-open { overflow: hidden; }

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration: none;
}

.variant {
  min-height: 100vh;
  overflow: hidden;
}

.enter {
  animation: enter-up 720ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.enter-1 { animation-delay: 20ms; }
.enter-2 { animation-delay: 100ms; }
.enter-3 { animation-delay: 180ms; }
.enter-4 { animation-delay: 260ms; }

@keyframes enter-up {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .enter { animation: none; }
  .current-cta { transition: none; }
}

/* ─────────────────────────────────────────────────────────────
   01 · CURRENT LANGUAGE
   ───────────────────────────────────────────────────────────── */

.variant-current {
  --paper: #edf7f8;
  --paper-2: #dceff2;
  --card: #f8fcfc;
  --ink: #082f49;
  --muted: #536d78;
  --accent: #087ea4;
  --accent-strong: #075985;
  --accent-soft: #bfe8ee;
  --line: rgba(8, 47, 73, 0.16);
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "SF Pro Text", "PingFang SC", "Noto Sans CJK SC", sans-serif;
}

.current-hero-shell {
  position: relative;
  min-height: 100dvh;
  overflow: hidden;
  isolation: isolate;
  background: var(--paper-2);
}

.current-hero-video,
.current-hero-scrim {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.current-hero-video {
  z-index: -2;
  object-fit: cover;
  opacity: 0.92;
  filter: saturate(0.85) contrast(0.82) brightness(1.12);
}

.current-hero-scrim {
  z-index: -1;
  background: rgba(183, 225, 232, 0.62);
}

.current-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1280px, calc(100% - 40px));
  height: 74px;
  margin: 0 auto;
  border-bottom: 1px solid rgba(8, 47, 73, 0.18);
}

.current-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.08em;
}

.current-brand > span {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 50%;
  color: #f4fcfd;
  background: var(--accent-strong);
  font-family: "Songti SC", STSong, serif;
}

.current-nav,
.current-header-actions {
  display: flex;
  align-items: center;
}

.current-nav { gap: 28px; }
.current-nav a { font-size: 13px; font-weight: 600; transition: opacity 160ms ease; }

.current-header-actions { gap: 10px; }
.current-header-action {
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  transition: transform 160ms cubic-bezier(0.23, 1, 0.32, 1), background-color 160ms ease, box-shadow 160ms ease;
}

.current-header-action-primary { color: #f4fcfd; background: var(--accent-strong); }
.current-header-action-secondary { background: rgba(248, 252, 252, 0.74); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }
.current-header-action:active { transform: scale(0.97); }

.current-menu-trigger,
.current-menu-close {
  display: none;
  align-items: center;
  justify-content: center;
  border: 0;
  color: var(--ink);
  cursor: pointer;
}

.current-menu-trigger {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(248, 252, 252, 0.72);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.current-hero {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: min(1280px, calc(100% - 40px));
  min-height: calc(100dvh - 74px);
  margin: 0 auto;
  padding: clamp(40px, 8vw, 72px) 20px 48px;
  text-align: center;
}

.current-hero-copy {
  width: 100%;
  max-width: 860px;
}

.eyebrow,
.section-index {
  margin: 0 0 26px;
  color: var(--accent-strong);
  font-family: Inter, "SF Pro Text", "PingFang SC", sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.current-hero h1 {
  max-width: 860px;
  margin: 0;
  font-family: "Songti SC", STSong, "Noto Serif CJK SC", serif;
  font-size: clamp(46px, 6vw, 84px);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 1.02;
}

.hero-line {
  display: block;
  white-space: nowrap;
}

.hero-line-accent {
  color: var(--accent);
}

.hero-line svg {
  display: inline-block;
  width: 0.72em;
  height: 0.72em;
  margin: 0 0.1em;
  vertical-align: -0.03em;
  color: var(--ink);
}

.hero-deck {
  max-width: 560px;
  margin: 28px auto 0;
  color: rgba(8, 47, 73, 0.8);
  font-size: clamp(14px, 1.7vw, 17px);
  line-height: 1.7;
}

.current-cta {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  min-width: 198px;
  margin-top: 30px;
  padding: 16px 20px;
  border-radius: 999px;
  color: #f4fcfd;
  background: var(--accent-strong);
  box-shadow: 0 7px 26px rgba(7, 89, 133, 0.24);
  font-size: clamp(14px, 1.6vw, 16px);
  font-weight: 700;
  transition: transform 180ms cubic-bezier(0.23, 1, 0.32, 1), background-color 180ms ease, box-shadow 180ms ease;
}

.current-cta svg { width: 20px; height: 20px; }
.current-cta:active { transform: scale(0.97); }
.current-cta:focus-visible,
.current-header-action:focus-visible,
.current-menu-trigger:focus-visible,
.current-menu-close:focus-visible,
.current-mobile-nav a:focus-visible,
.current-mobile-action:focus-visible,
.assessment-options button:focus-visible { outline: 3px solid var(--accent-soft); outline-offset: 3px; }

.current-mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 20;
  visibility: hidden;
  pointer-events: none;
  transition: visibility 0s linear 350ms;
}

.current-menu-backdrop,
.current-menu-sheet { position: fixed; top: 0; bottom: 0; }
.current-menu-backdrop {
  right: 0;
  left: 0;
  border: 0;
  opacity: 0;
  background: rgba(8, 47, 73, 0.32);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  transition: opacity 260ms ease;
}

.current-menu-sheet {
  right: 0;
  display: flex;
  flex-direction: column;
  width: min(88vw, 360px);
  min-height: 100dvh;
  padding: 18px 0 24px;
  background: #c8e5e9;
  box-shadow: -12px 0 48px rgba(8, 47, 73, 0.18);
  transform: translateX(100%);
  transition: transform 350ms cubic-bezier(0.55, 0, 1, 0.45);
}

.current-mobile-menu[data-open="true"] {
  visibility: visible;
  pointer-events: auto;
  transition-delay: 0s;
}

.current-mobile-menu[data-open="true"] .current-menu-backdrop { opacity: 1; }
.current-mobile-menu[data-open="true"] .current-menu-sheet {
  transform: translateX(0);
  transition-duration: 450ms;
  transition-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

.current-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px 18px;
}

.current-menu-close {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(8, 47, 73, 0.1);
  transition: transform 140ms cubic-bezier(0.23, 1, 0.32, 1), background-color 140ms ease;
}

.current-menu-close svg { width: 20px; height: 20px; }
.current-menu-close:active { transform: scale(0.9); }
.current-menu-divider { height: 1px; margin: 0 24px; background: rgba(8, 47, 73, 0.14); }
.current-mobile-nav { display: grid; gap: 4px; padding: 24px; }
.current-mobile-nav a {
  padding: 14px 16px;
  border-radius: 14px;
  opacity: 0;
  font-size: 17px;
  font-weight: 650;
  transform: translateX(24px);
  transition: opacity 220ms ease, transform 220ms cubic-bezier(0.23, 1, 0.32, 1), background-color 160ms ease;
}

.current-mobile-menu[data-open="true"] .current-mobile-nav a {
  opacity: 1;
  transform: translateX(0);
  transition-delay: calc(180ms + var(--menu-index) * 70ms);
  transition-duration: 400ms;
}

.current-mobile-actions { display: grid; gap: 10px; margin-top: auto; padding: 24px; }
.current-mobile-action { padding: 14px 18px; border-radius: 999px; text-align: center; font-size: 15px; font-weight: 700; }
.current-mobile-action-primary { color: #f4fcfd; background: var(--accent-strong); }
.current-mobile-action-secondary { background: rgba(248, 252, 252, 0.76); }
.current-mobile-action:active { transform: scale(0.97); }

@media (hover: hover) and (pointer: fine) {
  .current-nav a:hover { opacity: 0.68; }
  .current-header-action-primary:hover { background: var(--accent); box-shadow: 0 6px 20px rgba(7, 89, 133, 0.22); }
  .current-header-action-secondary:hover { background: rgba(248, 252, 252, 0.94); }
  .current-cta:hover { transform: scale(1.04); background: var(--accent); box-shadow: 0 9px 32px rgba(7, 89, 133, 0.28); }
  .current-menu-close:hover,
  .current-mobile-nav a:hover { background: rgba(8, 47, 73, 0.09); }
}

.current-principles {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, 1fr);
  color: #f6f1e7;
  background: var(--ink);
}

.current-principles > * { min-height: 176px; padding: 34px clamp(24px, 3.2vw, 54px); border-right: 1px solid rgba(255, 255, 255, 0.12); }
.current-principles > *:last-child { border-right: 0; }
.principles-lead { display: flex; align-items: center; margin: 0; color: #a9e5ec; font: 700 clamp(20px, 2vw, 28px)/1.25 "Songti SC", STSong, serif; }
.current-principles div { display: grid; grid-template-columns: 30px 1fr; align-content: center; }
.current-principles div span { grid-row: 1 / 3; color: #70d1dc; font: 10px "SFMono-Regular", monospace; }
.current-principles div strong { font: 700 15px "Songti SC", STSong, serif; }
.current-principles div small { margin-top: 8px; color: rgba(255, 255, 255, 0.58); font-size: 11px; line-height: 1.65; }

.current-section {
  width: min(1160px, calc(100% - 80px));
  margin: 0 auto;
  padding: 120px 0;
}

.section-heading { margin-bottom: 48px; }
.section-heading .section-index { margin-bottom: 18px; }
.section-heading h2 { margin: 0; font: 700 clamp(38px, 4.2vw, 57px)/1.06 "Songti SC", STSong, serif; letter-spacing: -0.035em; }
.section-heading > p:last-child { max-width: 600px; margin: 18px 0 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

.current-assessment { padding-bottom: 48px; }
.assessment-layout { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 20px; }
.assessment-options { display: grid; }
.assessment-options button { display: grid; grid-template-columns: 100px 1fr auto; align-items: center; min-height: 78px; padding: 0 24px; border: 1px solid var(--line); border-bottom: 0; color: var(--ink); background: rgba(255, 255, 255, 0.36); text-align: left; cursor: pointer; }
.assessment-options button:last-child { border-bottom: 1px solid var(--line); }
.assessment-options button:hover { background: rgba(255, 255, 255, 0.72); }
.assessment-options button[aria-pressed="true"] { position: relative; border-left: 6px solid #70d1dc; color: #fff; background: var(--ink); }
.assessment-options b { font: 700 16px "Songti SC", STSong, serif; }
.assessment-options span { color: inherit; opacity: 0.7; font-size: 12px; }
.assessment-options i { color: var(--accent-strong); font-style: normal; font-size: 10px; }
.assessment-options button[aria-pressed="true"] i { color: #a9e5ec; }

.recommendation { display: flex; flex-direction: column; justify-content: space-between; padding: 30px; color: var(--ink); background: var(--accent-soft); }
.recommendation p { margin: 0; font: 10px "SFMono-Regular", monospace; letter-spacing: 0.12em; }
.recommendation strong { display: block; margin: 32px 0; font: 700 20px/1.55 "Songti SC", STSong, serif; }
.recommendation span { padding-top: 16px; border-top: 1px solid rgba(24, 60, 55, 0.2); font-size: 10px; }

.current-route { padding-top: 100px; }
.route-list { margin: 0; padding: 0; border-top: 2px solid var(--ink); list-style: none; }
.route-list li { display: grid; grid-template-columns: 52px minmax(250px, 0.82fr) minmax(280px, 1fr) 90px; gap: 22px; align-items: center; min-height: 108px; padding: 16px 12px; border-bottom: 1px solid var(--line); }
.route-list > li > span { color: var(--accent-strong); font: 11px "SFMono-Regular", monospace; }
.route-list small { color: var(--muted); font: 9px "SFMono-Regular", monospace; letter-spacing: 0.12em; }
.route-list h3 { margin: 6px 0 0; font: 700 19px "Songti SC", STSong, serif; }
.route-list p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.7; }
.route-list > li > b { justify-self: end; padding: 7px 10px; border-radius: 999px; color: var(--ink); background: var(--accent-soft); font-size: 9px; font-weight: 600; }

.current-session {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  color: #f8f4ea;
  background: var(--ink);
}

.session-intro { padding: clamp(70px, 8vw, 120px) clamp(40px, 7vw, 110px); background: var(--ink); }
.session-intro .section-index { color: #70d1dc; }
.session-intro h2 { margin: 0; font: 700 clamp(40px, 4.6vw, 64px)/1.08 "Songti SC", STSong, serif; letter-spacing: -0.04em; }
.session-intro > p:not(.section-index) { max-width: 420px; margin: 32px 0; color: rgba(255, 255, 255, 0.56); font-size: 12px; line-height: 1.8; }
.session-intro > strong { display: inline-block; color: #a9e5ec; font: 11px "SFMono-Regular", monospace; }
.session-checklist { padding: clamp(60px, 7vw, 100px) clamp(40px, 7vw, 110px); background: #063958; }
.session-checklist label { display: grid; grid-template-columns: 24px 64px 1fr; align-items: center; min-height: 82px; border-bottom: 1px solid rgba(255, 255, 255, 0.12); cursor: pointer; }
.session-checklist input { width: 16px; height: 16px; accent-color: #70d1dc; }
.session-checklist label > span { color: #70d1dc; font: 10px "SFMono-Regular", monospace; }
.session-checklist b { display: block; font: 700 16px "Songti SC", STSong, serif; }
.session-checklist small { display: block; margin-top: 6px; color: rgba(255, 255, 255, 0.74); font-size: 10px; }
.session-checklist label:has(input:checked) b { color: #a9e5ec; text-decoration: line-through; text-decoration-thickness: 1px; }

.current-rhythm { padding-top: 96px; }
.rhythm-track {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr 1fr 1.16fr;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.rhythm-track article {
  min-height: 248px;
  padding: 28px 24px;
  border-right: 1px solid var(--line);
}

.rhythm-track article:last-child { border-right: 0; }
.rhythm-track span { color: var(--accent-strong); font: 10px "SFMono-Regular", monospace; }
.rhythm-track h3 { min-height: 52px; margin: 28px 0 14px; font: 700 21px/1.25 "Songti SC", STSong, serif; }
.rhythm-track p { min-height: 62px; margin: 0; color: var(--muted); font-size: 12px; line-height: 1.75; }
.rhythm-track b { display: block; margin-top: 22px; color: var(--accent-strong); font-size: 10px; line-height: 1.6; }

.rhythm-guidance {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 24px;
  color: #f4fcfd;
  background: var(--ink);
}

.rhythm-guidance div {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 5px 10px;
  min-height: 138px;
  padding: 26px;
  border-right: 1px solid rgba(255, 255, 255, 0.12);
}

.rhythm-guidance div:last-child { border-right: 0; }
.rhythm-guidance svg { grid-row: 1 / 3; width: 21px; height: 21px; color: #70d1dc; }
.rhythm-guidance strong { font: 700 15px "Songti SC", STSong, serif; }
.rhythm-guidance span { color: rgba(255, 255, 255, 0.62); font-size: 10px; line-height: 1.7; }

.current-course {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper-2);
}

.current-course-inner { padding-top: 112px; padding-bottom: 112px; }
.course-map-layout { display: grid; grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr); gap: clamp(38px, 6vw, 86px); align-items: start; }
.course-figure { position: sticky; top: 24px; margin: 0; }
.course-figure img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.course-figure figcaption { display: grid; grid-template-columns: 150px 1fr; gap: 22px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.course-figure figcaption b { font: 700 14px "Songti SC", STSong, serif; }
.course-figure figcaption span { color: var(--muted); font-size: 11px; line-height: 1.75; }

.course-modules { border-top: 2px solid var(--ink); }
.course-modules details { border-bottom: 1px solid var(--line); }
.course-modules summary {
  display: grid;
  grid-template-columns: 95px minmax(0, 1fr) auto 22px;
  gap: 14px;
  align-items: center;
  min-height: 104px;
  padding: 18px 12px;
  cursor: pointer;
  list-style: none;
}

.course-modules summary::-webkit-details-marker,
.safety-accordions summary::-webkit-details-marker,
.faq-grid summary::-webkit-details-marker { display: none; }
.course-modules summary > span { color: var(--accent-strong); font-size: 10px; font-weight: 700; }
.course-modules summary strong { font: 700 19px "Songti SC", STSong, serif; }
.course-modules summary small { color: var(--muted); font-size: 9px; }
.course-modules summary svg,
.safety-accordions summary svg,
.faq-grid summary svg { width: 18px; height: 18px; transition: transform 180ms cubic-bezier(0.23, 1, 0.32, 1); }
.course-modules details[open] summary svg,
.safety-accordions details[open] summary svg,
.faq-grid details[open] summary svg { transform: rotate(180deg); }

.module-outcomes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0 12px 24px;
  background: var(--line);
}

.module-outcomes div { min-height: 152px; padding: 22px; background: rgba(248, 252, 252, 0.92); }
.module-outcomes dt { color: var(--accent-strong); font-size: 10px; font-weight: 700; }
.module-outcomes dd { margin: 16px 0 0; color: var(--muted); font-size: 11px; line-height: 1.75; }

.practice-columns { display: grid; grid-template-columns: 0.94fr 1.06fr; }
.practice-columns article { padding: clamp(34px, 4vw, 54px); }
.practice-pool { color: #f4fcfd; background: var(--ink); }
.practice-land { border: 1px solid var(--line); background: rgba(248, 252, 252, 0.72); }
.practice-title { display: grid; grid-template-columns: 30px 1fr auto; align-items: center; padding-bottom: 28px; border-bottom: 1px solid currentColor; }
.practice-title svg { width: 22px; height: 22px; color: #70d1dc; }
.practice-title h3 { margin: 0; font: 700 28px "Songti SC", STSong, serif; }
.practice-title span { font-size: 9px; opacity: 0.62; }
.practice-land .practice-title span { color: #355b69; opacity: 1; }
.practice-columns ol { margin: 0; padding: 0; list-style: none; counter-reset: practice; }
.practice-columns li { display: grid; grid-template-columns: 1fr 1.35fr; gap: 24px; min-height: 86px; align-items: center; border-bottom: 1px solid currentColor; counter-increment: practice; }
.practice-columns li:last-child { border-bottom: 0; }
.practice-columns li b { font: 700 15px "Songti SC", STSong, serif; }
.practice-columns li span { font-size: 10px; line-height: 1.7; opacity: 0.68; }

.stroke-order {
  display: grid;
  grid-template-columns: 1.25fr repeat(4, 1fr);
  margin-top: 56px;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.stroke-order > * { min-height: 180px; padding: 28px 22px; border-right: 1px solid var(--line); }
.stroke-order > *:last-child { border-right: 0; }
.stroke-order header h3 { margin: 0; font: 700 25px "Songti SC", STSong, serif; }
.stroke-order header p { margin: 22px 0 0; color: var(--muted); font-size: 10px; line-height: 1.7; }
.stroke-order div { display: flex; flex-direction: column; }
.stroke-order div span { color: var(--accent-strong); font-size: 9px; font-weight: 700; }
.stroke-order div b { margin-top: auto; font: 700 18px "Songti SC", STSong, serif; }
.stroke-order div small { margin-top: 12px; color: var(--muted); font-size: 9px; line-height: 1.6; }

.session-bookends { display: grid; gap: 1px; margin: 38px 0; background: rgba(255, 255, 255, 0.12); }
.session-bookends div { padding: 18px; background: rgba(255, 255, 255, 0.045); }
.session-bookends span { display: block; color: #70d1dc; font: 9px "SFMono-Regular", monospace; }
.session-bookends b { display: block; margin-top: 10px; color: rgba(255, 255, 255, 0.78); font-size: 10px; line-height: 1.65; }

.safety-layout { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.72fr); gap: clamp(28px, 5vw, 68px); align-items: start; }
.safety-accordions { border-top: 2px solid var(--ink); }
.safety-accordions details { border-bottom: 1px solid var(--line); }
.safety-accordions summary,
.faq-grid summary { display: grid; grid-template-columns: 1fr 22px; gap: 20px; align-items: center; min-height: 78px; padding: 12px 4px; cursor: pointer; list-style: none; }
.safety-accordions summary strong,
.faq-grid summary strong { font: 700 17px "Songti SC", STSong, serif; }
.safety-accordions details > p,
.faq-grid details > p { margin: 0; padding: 0 44px 24px 4px; color: var(--muted); font-size: 11px; line-height: 1.85; }

.safety-kit { padding: 34px; background: var(--accent-soft); }
.safety-kit-head { display: flex; align-items: center; gap: 14px; padding-bottom: 24px; border-bottom: 1px solid rgba(8, 47, 73, 0.2); }
.safety-kit-head svg { width: 24px; height: 24px; color: var(--accent-strong); }
.safety-kit h3 { margin: 0; font: 700 26px "Songti SC", STSong, serif; }
.safety-kit ul { margin: 0; padding: 0; list-style: none; }
.safety-kit li { padding: 20px 0; border-bottom: 1px solid rgba(8, 47, 73, 0.16); }
.safety-kit li b { display: block; font: 700 14px "Songti SC", STSong, serif; }
.safety-kit li span { display: block; margin-top: 7px; color: #355b69; font-size: 10px; line-height: 1.65; }
.safety-kit > p { margin: 28px 0 0; color: var(--ink); font-size: 10px; font-weight: 650; line-height: 1.75; }

.current-benefits { border-top: 1px solid var(--line); background: var(--paper-2); }
.benefits-inner { padding-top: 112px; padding-bottom: 112px; }
.benefits-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1px; background: var(--line); }
.benefits-grid article { min-height: 210px; padding: 30px; background: rgba(248, 252, 252, 0.88); }
.benefits-grid article svg { width: 24px; height: 24px; color: var(--accent-strong); }
.benefits-grid h3 { margin: 54px 0 12px; font: 700 20px "Songti SC", STSong, serif; }
.benefits-grid p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.75; }
.benefit-lead { grid-column: 1 / 8; grid-row: 1 / 3; min-height: 421px !important; color: #f4fcfd; background: var(--ink) !important; }
.benefit-lead svg { color: #70d1dc !important; }
.benefit-lead h3 { max-width: 540px; margin-top: 170px; font-size: clamp(34px, 4vw, 52px); line-height: 1.05; }
.benefit-lead p { max-width: 560px; color: rgba(255, 255, 255, 0.62); }
.benefits-grid article:nth-child(2) { grid-column: 8 / 13; }
.benefits-grid article:nth-child(3) { grid-column: 8 / 11; background: var(--accent-soft); }
.benefits-grid article:nth-child(4) { grid-column: 11 / 13; }
.benefits-grid article:nth-child(3) p,
.benefit-progress p { color: #355b69; }
.benefit-progress { grid-column: 1 / 13; display: grid; grid-template-columns: 40px 0.7fr 1fr; gap: 24px; align-items: center; min-height: 160px !important; background: #b6e2e8 !important; }
.benefit-progress h3 { margin: 0; }
.benefit-progress span { grid-column: 3; color: var(--accent-strong); font-size: 10px; font-weight: 700; }

.current-faq { padding-top: 110px; }
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); column-gap: 46px; border-top: 2px solid var(--ink); }
.faq-grid details { border-bottom: 1px solid var(--line); }

.current-sources {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 70px;
  padding: 54px max(40px, calc((100% - 1160px) / 2));
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #f4fcfd;
  background: var(--ink);
}

.current-sources h2 { margin: 0; font: 700 22px "Songti SC", STSong, serif; }
.current-sources p { max-width: 500px; margin: 16px 0 0; color: rgba(255, 255, 255, 0.56); font-size: 10px; line-height: 1.8; }
.current-sources nav { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: rgba(255, 255, 255, 0.12); }
.current-sources a { display: flex; align-items: center; min-height: 54px; padding: 14px 18px; background: rgba(255, 255, 255, 0.04); font-size: 10px; transition: background-color 160ms ease; }

.course-modules summary:focus-visible,
.safety-accordions summary:focus-visible,
.faq-grid summary:focus-visible,
.current-sources a:focus-visible { outline: 3px solid var(--accent-soft); outline-offset: 3px; }

@media (hover: hover) and (pointer: fine) {
  .course-modules summary:hover,
  .safety-accordions summary:hover,
  .faq-grid summary:hover { color: var(--accent-strong); }
  .current-sources a:hover { background: rgba(255, 255, 255, 0.1); }
}

.current-footer { display: flex; justify-content: space-between; padding: 30px 50px 100px; color: rgba(255, 255, 255, 0.76); background: var(--ink); font: 9px "SFMono-Regular", monospace; letter-spacing: 0.08em; }

/* ─────────────────────────────────────────────────────────────
   02 · LANE LAB
   ───────────────────────────────────────────────────────────── */

.variant-lab {
  --navy: #071b24;
  --navy-2: #0a2732;
  --aqua: #49e3d2;
  --signal: #e9ff62;
  --white: #ecf8f4;
  --blue: #16768a;
  color: var(--white);
  background: var(--navy);
  font-family: "DIN Alternate", "Arial Narrow", "Helvetica Neue", "PingFang SC", sans-serif;
  letter-spacing: 0.01em;
}

.lab-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
  padding: 0 32px;
  border-bottom: 1px solid rgba(73, 227, 210, 0.22);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 9px;
  letter-spacing: 0.14em;
}

.lab-wordmark { display: flex; align-items: center; gap: 12px; font-weight: 700; }
.lab-wordmark i { display: block; width: 24px; height: 7px; background: repeating-linear-gradient(90deg, var(--aqua) 0 3px, transparent 3px 6px); transform: skewX(-24deg); }
.lab-status { display: flex; gap: 32px; color: rgba(236, 248, 244, 0.72); }
.status-live { color: var(--signal); }
.status-live::before { display: inline-block; width: 5px; height: 5px; margin: 0 7px 1px 0; border-radius: 50%; background: currentColor; box-shadow: 0 0 12px currentColor; content: ""; }

.lab-hero {
  position: relative;
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 720px;
  padding: 78px 4vw 42px;
  overflow: hidden;
  border-bottom: 1px solid rgba(73, 227, 210, 0.22);
  background:
    radial-gradient(circle at 74% 30%, rgba(22, 118, 138, 0.28), transparent 24rem),
    linear-gradient(115deg, #071b24 0 60%, #09242d 60%);
}

.lab-grid { position: absolute; inset: 0; opacity: 0.22; background-image: linear-gradient(rgba(73, 227, 210, 0.16) 1px, transparent 1px), linear-gradient(90deg, rgba(73, 227, 210, 0.16) 1px, transparent 1px); background-size: 56px 56px; -webkit-mask-image: linear-gradient(to bottom, black, transparent 86%); mask-image: linear-gradient(to bottom, black, transparent 86%); }
.lab-title { position: relative; z-index: 1; align-self: start; }
.lab-title > p:first-child { margin: 0 0 18px; color: var(--aqua); font: 10px "SFMono-Regular", monospace; letter-spacing: 0.22em; }
.lab-title h1 { display: flex; align-items: center; gap: 2vw; margin: 0; font-size: clamp(110px, 17vw, 250px); font-weight: 900; letter-spacing: -0.085em; line-height: 0.8; white-space: nowrap; }
.lab-title h1 span:last-child { color: transparent; -webkit-text-stroke: 1.5px var(--aqua); }
.lab-title h1 i { color: var(--signal); font: 400 clamp(44px, 7vw, 98px) "SFMono-Regular", monospace; letter-spacing: 0; }
.lab-cn { margin: 30px 0 0 !important; color: rgba(236, 248, 244, 0.74) !important; font: 600 clamp(18px, 2.2vw, 29px) "PingFang SC", sans-serif !important; letter-spacing: 0.12em !important; }

.lab-dashboard { position: absolute; top: 300px; right: 5vw; display: grid; grid-template-columns: repeat(3, 112px); border: 1px solid rgba(73, 227, 210, 0.3); background: rgba(5, 21, 28, 0.72); backdrop-filter: blur(8px); }
.lab-dashboard div { min-height: 112px; padding: 18px; border-right: 1px solid rgba(73, 227, 210, 0.2); }
.lab-dashboard div:last-child { border-right: 0; }
.lab-dashboard small { display: block; color: rgba(236, 248, 244, 0.42); font-size: 9px; }
.lab-dashboard strong { display: block; margin-top: 20px; color: var(--signal); font: 700 34px "SFMono-Regular", monospace; }
.lab-dashboard strong span { margin-left: 4px; color: rgba(236, 248, 244, 0.44); font-size: 9px; }

.lab-line-diagram { position: relative; align-self: end; width: calc(100% - 160px); height: 112px; margin: 0 80px; border-top: 1px solid var(--aqua); border-bottom: 1px solid rgba(73, 227, 210, 0.42); }
.lab-line-diagram::before { position: absolute; top: 50%; right: 0; left: 0; height: 3px; background: repeating-linear-gradient(90deg, var(--aqua) 0 20px, transparent 20px 30px); content: ""; transform: skewX(-30deg); opacity: 0.8; }
.lane-label { position: absolute; top: 10px; left: 0; color: var(--aqua); font: 8px "SFMono-Regular", monospace; letter-spacing: .14em; }
.distance-mark { position: absolute; bottom: 8px; color: rgba(236,248,244,.34); font: 8px "SFMono-Regular", monospace; }
.mark-0 { left: 0; } .mark-1 { left: 20%; } .mark-2 { left: 40%; } .mark-3 { left: 60%; } .mark-4 { left: 80%; } .mark-5 { right: 0; }
.swimmer-marker { position: absolute; z-index: 2; top: 39px; left: 28%; width: 64px; height: 24px; border: 2px solid var(--signal); border-radius: 50%; box-shadow: 0 0 22px rgba(233, 255, 98, 0.3); animation: marker-breathe 2.2s ease-in-out infinite; }
.swimmer-marker::after { position: absolute; top: 6px; right: -22px; width: 22px; height: 6px; background: var(--signal); content: ""; transform: skewX(-30deg); }
.motion-trace { position: absolute; top: 46px; left: 0; width: 28%; border-top: 1px dashed rgba(233, 255, 98, 0.42); }
@keyframes marker-breathe { 50% { box-shadow: 0 0 34px rgba(233, 255, 98, 0.48); } }
.lab-start { position: absolute; right: 26px; bottom: 30px; display: grid; width: 96px; height: 96px; place-items: center; border-radius: 50%; color: var(--navy); background: var(--signal); font-size: 11px; font-weight: 800; }
.lab-start b { position: absolute; bottom: 15px; }
.lab-start:hover { transform: rotate(5deg); }

.lab-safety-strip { display: grid; grid-template-columns: .8fr 1.2fr 1fr 1.4fr; align-items: center; min-height: 72px; padding: 0 32px; color: var(--navy); background: var(--signal); font-size: 10px; }
.lab-safety-strip span { font: 700 9px "SFMono-Regular", monospace; letter-spacing: .14em; }
.lab-safety-strip p { margin: 0; padding: 0 22px; border-left: 1px solid rgba(7,27,36,.28); }

.lab-assessment,
.lab-program,
.lab-session { display: grid; grid-template-columns: 155px 1fr; border-bottom: 1px solid rgba(73, 227, 210, 0.22); }
.lab-section-code { display: flex; flex-direction: column; justify-content: space-between; min-height: 100%; padding: 28px 24px; border-right: 1px solid rgba(73, 227, 210, 0.22); color: rgba(236, 248, 244, 0.74); font: 8px "SFMono-Regular", monospace; letter-spacing: .15em; }
.lab-section-code b { color: var(--aqua); font-size: 32px; font-weight: 400; }
.lab-assessment-main { display: grid; grid-template-columns: .75fr 1.1fr .9fr; min-height: 510px; }
.lab-section-title { padding: 76px 44px; }
.lab-section-title p { color: var(--aqua); font-size: 10px; }
.lab-section-title h2 { margin: 18px 0 0; font-size: clamp(42px, 4.3vw, 68px); line-height: 1.03; letter-spacing: -.05em; }
.lab-options { display: grid; align-content: center; }
.lab-options button { display: grid; grid-template-columns: 40px 1fr auto; align-items: center; min-height: 84px; padding: 0 22px; border: 1px solid rgba(73, 227, 210, .2); border-bottom: 0; color: var(--white); background: transparent; text-align: left; cursor: pointer; }
.lab-options button:last-child { border-bottom: 1px solid rgba(73, 227, 210, .2); }
.lab-options button span { display: grid; width: 25px; height: 25px; place-items: center; border: 1px solid rgba(236,248,244,.3); border-radius: 50%; font: 9px "SFMono-Regular", monospace; }
.lab-options button b { font-size: 14px; }
.lab-options button i { color: rgba(236,248,244,.72); font: 8px "SFMono-Regular", monospace; }
.lab-options button[aria-pressed="true"] { color: var(--navy); background: var(--aqua); }
.lab-options button[aria-pressed="true"] span { border-color: var(--navy); background: var(--navy); color: var(--signal); }
.lab-options button[aria-pressed="true"] i { color: #071b24; }
.lab-output { display: flex; flex-direction: column; justify-content: center; margin: 76px 44px; padding: 28px; border: 1px solid var(--signal); color: var(--navy); background: var(--signal); }
.lab-output span { font: 8px "SFMono-Regular", monospace; letter-spacing: .15em; }
.lab-output p { margin: 35px 0; font: 700 18px/1.65 "PingFang SC", sans-serif; }
.lab-output b { font: 8px "SFMono-Regular", monospace; }

.lab-program-head { display: grid; grid-template-columns: 1fr .7fr; gap: 80px; padding: 84px 70px 56px; }
.lab-program-head,
.lab-levels,
.lab-session-layout { grid-column: 2; }
.lab-program-head h2 { margin: 0; font-size: clamp(46px, 5vw, 76px); line-height: .98; letter-spacing: -.055em; }
.lab-program-head p { align-self: end; max-width: 420px; margin: 0; color: rgba(236,248,244,.48); font-size: 12px; line-height: 1.8; }
.lab-levels { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding: 0 70px 90px; list-style: none; }
.lab-levels li { position: relative; min-height: 240px; padding: 24px; border: 1px solid rgba(73,227,210,.22); margin: -1px 0 0 -1px; }
.lab-levels li > span { color: var(--aqua); font: 9px "SFMono-Regular", monospace; }
.lab-levels li > b { position: absolute; right: 17px; bottom: 10px; color: rgba(73,227,210,.1); font-size: 64px; }
.lab-levels small { color: rgba(236,248,244,.72); font: 8px "SFMono-Regular", monospace; letter-spacing: .12em; }
.lab-levels h3 { margin: 10px 0 18px; font-size: 25px; }
.lab-levels p { max-width: 250px; margin: 0; color: rgba(236,248,244,.72); font-size: 11px; line-height: 1.7; }
.lab-levels div { position: absolute; right: 24px; bottom: 28px; left: 24px; z-index: 1; }
.lab-levels li:hover { border-color: var(--aqua); background: var(--navy-2); }

.lab-session-layout { display: grid; grid-template-columns: .8fr 1.2fr; min-height: 590px; }
.lab-session-meter { display: flex; flex-direction: column; justify-content: center; padding: 70px; border-right: 1px solid rgba(73,227,210,.22); }
.lab-session-meter > span { color: var(--aqua); font: 9px "SFMono-Regular", monospace; letter-spacing: .16em; }
.lab-session-meter strong { margin: 24px 0 8px; color: var(--signal); font: 700 clamp(72px, 8vw, 126px)/1 "SFMono-Regular", monospace; letter-spacing: -.08em; }
.lab-session-meter p { color: rgba(236,248,244,.72); font: 9px "SFMono-Regular", monospace; }
.lab-session-meter i { display: block; width: 100%; height: 5px; margin-top: 48px; background: linear-gradient(90deg, var(--signal) 0 14%, rgba(236,248,244,.12) 14%); }
.lab-drills { align-self: center; padding: 60px 6vw; }
.lab-drills label { display: grid; grid-template-columns: 24px 70px 1fr auto; align-items: center; min-height: 74px; border-bottom: 1px solid rgba(73,227,210,.2); cursor: pointer; }
.lab-drills input { width: 14px; height: 14px; accent-color: var(--signal); }
.lab-drills span { color: var(--aqua); font: 9px "SFMono-Regular", monospace; }
.lab-drills b { font-size: 15px; }
.lab-drills small { color: rgba(236,248,244,.72); font: 9px "SFMono-Regular", monospace; }
.lab-drills label:has(input:checked) { color: var(--signal); }
.lab-drills label:has(input:checked) b { text-decoration: line-through; }
.lab-footer { display: flex; justify-content: space-between; padding: 35px 32px 110px; color: rgba(236,248,244,.7); font: 8px "SFMono-Regular", monospace; letter-spacing: .14em; }

/* ─────────────────────────────────────────────────────────────
   03 · FIELD NOTES
   ───────────────────────────────────────────────────────────── */

.variant-notes {
  --foam: #edf6f3;
  --foam-2: #dcefeb;
  --notes-ink: #173650;
  --notes-muted: #4b6269;
  --red: #b73630;
  --rule: rgba(23, 54, 80, 0.22);
  color: var(--notes-ink);
  background:
    linear-gradient(90deg, transparent calc(7vw - 1px), rgba(223,75,63,.18) 7vw, transparent calc(7vw + 1px)),
    var(--foam);
  font-family: "PingFang SC", "Noto Sans CJK SC", sans-serif;
}

.notes-header { display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; width: min(1280px, calc(100% - 80px)); height: 74px; margin: 0 auto; border-bottom: 1px solid var(--rule); font-size: 10px; letter-spacing: .08em; }
.notes-brand { font: 700 16px "Songti SC", STSong, serif; }
.notes-brand i { margin-left: 8px; color: var(--red); font: 9px "SFMono-Regular", monospace; }
.notes-header p { margin: 0; text-align: center; }
.notes-header > span { justify-self: end; color: var(--notes-muted); }

.notes-hero { position: relative; display: grid; grid-template-columns: 100px minmax(0, .95fr) minmax(400px, 1.05fr); gap: clamp(30px, 5vw, 90px); align-items: center; width: min(1280px, calc(100% - 80px)); min-height: 710px; margin: 0 auto; padding: 70px 0 100px; }
.notes-margin-note { align-self: start; margin: 40px 0 0; color: var(--red); font: 8px/1.65 "SFMono-Regular", monospace; letter-spacing: .14em; writing-mode: vertical-rl; }
.notes-hero-copy > span { color: var(--red); font-size: 10px; font-weight: 700; letter-spacing: .14em; }
.notes-hero h1 { margin: 26px 0 0; font: 700 clamp(57px, 6.2vw, 91px)/1.08 "Songti SC", STSong, serif; letter-spacing: -.055em; }
.notes-hero h1 em { position: relative; color: var(--notes-ink); font-style: normal; }
.notes-hero h1 em::after { position: absolute; right: 0; bottom: -9px; left: 0; height: 8px; background: linear-gradient(177deg, transparent 0 32%, var(--red) 35% 51%, transparent 54%); content: ""; opacity: .82; }
.notes-hero-copy > p { max-width: 570px; margin: 34px 0 0; color: var(--notes-muted); font: 16px/1.9 "Songti SC", STSong, serif; }
.notes-water-figure { margin: 0; }
.notes-water-figure svg { display: block; width: 100%; overflow: visible; }
.notes-water-figure path, .notes-water-figure circle { fill: none; stroke: var(--notes-ink); stroke-linecap: round; stroke-width: 3; }
.notes-water-figure .water-line { stroke: #4aa5ae; stroke-width: 5; }
.notes-water-figure .breath-dot { fill: var(--red); stroke: none; }
.notes-water-figure figcaption { display: flex; gap: 20px; max-width: 430px; margin: -20px auto 0; color: var(--notes-muted); font: 11px "Songti SC", STSong, serif; }
.notes-water-figure figcaption span { color: var(--red); font: 8px "SFMono-Regular", monospace; }
.notes-arrow { position: absolute; right: 0; bottom: 45px; display: grid; width: 52px; height: 52px; place-items: center; border: 1px solid var(--rule); border-radius: 50%; color: var(--red); }

.notes-thesis { display: grid; grid-template-columns: .58fr 1.2fr .65fr; gap: clamp(30px, 5vw, 90px); padding: 120px max(7vw, calc((100% - 1280px) / 2)); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); background: rgba(255,255,255,.28); }
.notes-thesis > p { margin: 8px 0 0; color: var(--red); font: 10px/1.6 "SFMono-Regular", monospace; letter-spacing: .1em; }
.notes-thesis h2 { margin: 0; font: 700 clamp(42px, 4.8vw, 70px)/1.24 "Songti SC", STSong, serif; letter-spacing: -.04em; }
.notes-thesis h2 i { color: var(--red); font-style: normal; }
.notes-thesis aside { align-self: end; padding: 22px 0 0; border-top: 2px solid var(--red); }
.notes-thesis aside span { color: var(--red); font-size: 9px; }
.notes-thesis aside b { display: block; margin: 14px 0 8px; font: 700 20px "Songti SC", STSong, serif; }
.notes-thesis aside p { margin: 0; color: var(--notes-muted); font-size: 11px; line-height: 1.7; }

.notes-assessment,
.notes-route,
.notes-session { position: relative; width: min(1150px, calc(100% - 80px)); margin: 0 auto; padding: 115px 0; }
.notes-kicker { display: flex; align-items: center; justify-content: space-between; padding-bottom: 16px; border-bottom: 1px solid var(--notes-ink); color: var(--red); font-size: 10px; letter-spacing: .12em; }
.notes-kicker b { font: 400 20px "Songti SC", STSong, serif; }
.notes-assessment { display: grid; grid-template-columns: .75fr 1.25fr; gap: 40px 90px; }
.notes-assessment .notes-kicker { grid-column: 1 / -1; }
.notes-assessment-copy h2 { margin: 20px 0; font: 700 clamp(40px, 4.2vw, 58px)/1.16 "Songti SC", STSong, serif; letter-spacing: -.035em; }
.notes-assessment-copy p { color: var(--notes-muted); font-size: 12px; }
.notes-options { border-top: 1px solid var(--rule); }
.notes-options button { display: grid; grid-template-columns: 36px 1fr; width: 100%; padding: 23px 4px; border: 0; border-bottom: 1px solid var(--rule); color: var(--notes-ink); background: transparent; text-align: left; cursor: pointer; }
.notes-options button > span { grid-row: 1 / 3; color: var(--red); font-size: 22px; }
.notes-options button b { font: 700 17px "Songti SC", STSong, serif; }
.notes-options button small { margin-top: 7px; color: var(--notes-muted); font-size: 10px; }
.notes-options button[aria-pressed="true"] > span { color: transparent; border: 2px solid var(--red); border-radius: 50%; width: 16px; height: 16px; margin-top: 2px; box-shadow: inset 0 0 0 4px var(--foam); background: var(--red); }
.notes-options button:hover b { color: var(--red); }
.notes-prescription { grid-column: 2; display: grid; grid-template-columns: 145px 1fr; gap: 22px; margin-top: 8px; padding: 28px; border-left: 4px solid var(--red); background: var(--foam-2); }
.notes-prescription > span { color: var(--red); font: 9px "SFMono-Regular", monospace; letter-spacing: .1em; }
.notes-prescription p { margin: 0; font: 700 18px/1.65 "Songti SC", STSong, serif; }
.notes-prescription small { grid-column: 2; color: var(--notes-muted); font-size: 10px; }

.notes-route { width: 100%; padding-right: max(7vw, calc((100% - 1150px) / 2)); padding-left: max(7vw, calc((100% - 1150px) / 2)); border-top: 1px solid var(--rule); background: #dcefeb; }
.notes-route header { display: grid; grid-template-columns: 1fr .6fr; gap: 80px; padding: 58px 0 50px; }
.notes-route h2 { margin: 0; font: 700 clamp(44px, 5vw, 72px)/1.1 "Songti SC", STSong, serif; letter-spacing: -.045em; }
.notes-route header p { align-self: end; margin: 0; color: var(--notes-muted); font-size: 12px; line-height: 1.8; }
.notes-route ol { display: grid; grid-template-columns: repeat(2, 1fr); margin: 0; padding: 0; border-top: 1px solid var(--notes-ink); list-style: none; }
.notes-route li { display: grid; grid-template-columns: 42px 1fr auto; gap: 20px; align-items: center; min-height: 118px; padding: 20px 24px 20px 0; border-bottom: 1px solid var(--rule); }
.notes-route li:nth-child(odd) { border-right: 1px solid var(--rule); }
.notes-route li:nth-child(even) { padding-left: 24px; }
.notes-route li > span { display: grid; width: 34px; height: 34px; place-items: center; border: 1px solid var(--red); border-radius: 50%; color: var(--red); font: 16px "Songti SC", STSong, serif; }
.notes-route h3 { margin: 0 0 8px; font: 700 18px "Songti SC", STSong, serif; }
.notes-route li p { margin: 0; color: var(--notes-muted); font-size: 10px; }
.notes-route li small { color: var(--red); font: 10px "Songti SC", STSong, serif; }

.notes-session { display: grid; grid-template-columns: .7fr 1.3fr; gap: 56px 90px; }
.notes-session .notes-kicker { grid-column: 1 / -1; }
.notes-session-head h2 { margin: 22px 0; font: 700 clamp(42px, 4.4vw, 62px)/1.14 "Songti SC", STSong, serif; letter-spacing: -.04em; }
.notes-session-head p { color: var(--notes-muted); font-size: 11px; line-height: 1.8; }
.notes-session-head > span { display: inline-block; margin-top: 24px; padding: 8px 11px; color: var(--red); border: 1px solid var(--red); font: 9px "SFMono-Regular", monospace; }
.notes-checklist { border-top: 1px solid var(--notes-ink); }
.notes-checklist label { display: grid; grid-template-columns: 24px 62px 1fr; align-items: center; min-height: 79px; border-bottom: 1px solid var(--rule); cursor: pointer; }
.notes-checklist input { width: 15px; height: 15px; accent-color: var(--red); }
.notes-checklist label > span { color: var(--red); font: 9px "SFMono-Regular", monospace; }
.notes-checklist b { display: block; font: 700 16px "Songti SC", STSong, serif; }
.notes-checklist small { display: block; margin-top: 4px; color: var(--notes-muted); font-size: 10px; }
.notes-checklist label:has(input:checked) b { color: var(--red); text-decoration: line-through; }
.notes-session blockquote { grid-column: 1 / -1; margin: 20px 0 0; padding: 65px 80px; color: var(--foam); background: var(--notes-ink); font: 700 clamp(25px, 3vw, 40px)/1.4 "Songti SC", STSong, serif; text-align: center; }
.notes-session cite { display: block; margin-top: 20px; color: #8ebfc0; font: 10px "PingFang SC", sans-serif; font-style: normal; }
.notes-footer { display: flex; justify-content: space-between; padding: 36px max(7vw, calc((100% - 1280px) / 2)) 115px; border-top: 1px solid var(--rule); color: var(--notes-muted); font-size: 9px; letter-spacing: .08em; }
.notes-footer p { margin: 0; color: var(--notes-ink); font-family: "Songti SC", STSong, serif; }
.notes-footer b { color: var(--red); }

/* ─────────────────────────────────────────────────────────────
   RESPONSIVE
   ───────────────────────────────────────────────────────────── */

@media (max-width: 980px) {
  .current-nav, .current-header-actions { display: none; }
  .current-menu-trigger, .current-menu-close { display: flex; }
  .current-principles { grid-template-columns: repeat(3, 1fr); }
  .principles-lead { grid-column: 1 / -1; min-height: 120px; }
  .assessment-layout, .current-session { grid-template-columns: 1fr; }
  .recommendation { min-height: 280px; }
  .route-list li { grid-template-columns: 46px 1fr auto; }
  .route-list li > p { grid-column: 2 / 4; }
  .rhythm-track { grid-template-columns: repeat(2, 1fr); }
  .rhythm-track article:nth-child(2) { border-right: 0; }
  .rhythm-track article:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .course-map-layout, .practice-columns, .safety-layout { grid-template-columns: 1fr; }
  .course-figure { position: static; }
  .course-figure img { aspect-ratio: 16 / 10; }
  .module-outcomes { grid-template-columns: 1fr; }
  .module-outcomes div { min-height: auto; }
  .stroke-order { grid-template-columns: repeat(2, 1fr); }
  .stroke-order header { grid-column: 1 / -1; }
  .stroke-order > *:nth-child(3), .stroke-order > *:nth-child(5) { border-right: 0; }
  .stroke-order > * { border-bottom: 1px solid var(--line); }
  .benefit-lead { grid-column: 1 / 13; grid-row: auto; min-height: 340px !important; }
  .benefit-lead h3 { margin-top: 110px; }
  .benefits-grid article:nth-child(2) { grid-column: 1 / 7; }
  .benefits-grid article:nth-child(3) { grid-column: 7 / 13; }
  .benefits-grid article:nth-child(4) { grid-column: 1 / 13; }
  .current-sources { grid-template-columns: 1fr; gap: 30px; }

  .lab-dashboard { top: auto; right: auto; bottom: 200px; left: 4vw; }
  .lab-assessment-main { grid-template-columns: 1fr 1fr; }
  .lab-section-title { grid-column: 1 / -1; padding-bottom: 24px; }
  .lab-output { margin: 0 44px 60px; }
  .lab-levels { grid-template-columns: repeat(2, 1fr); }
  .lab-session-layout { grid-template-columns: 1fr; }
  .lab-session-meter { border-right: 0; border-bottom: 1px solid rgba(73,227,210,.22); }

  .notes-hero { grid-template-columns: 60px 1fr; }
  .notes-water-figure { grid-column: 2; max-width: 640px; }
  .notes-thesis { grid-template-columns: 1fr 1fr; }
  .notes-thesis > p { grid-column: 1 / -1; }
  .notes-assessment, .notes-session { grid-template-columns: 1fr; }
  .notes-prescription { grid-column: 1; }
  .notes-session-head, .notes-checklist { grid-column: 1; }
}

@media (max-width: 680px) {
  html { scroll-behavior: auto; }
  .current-header, .current-hero, .current-section, .notes-header, .notes-hero, .notes-assessment, .notes-session { width: calc(100% - 36px); }
  .current-header { height: 68px; }
  .current-brand { font-size: 12px; }
  .current-brand > span { width: 30px; height: 30px; }
  .current-hero { min-height: calc(100dvh - 68px); padding: 36px 0 48px; }
  .current-hero h1 { font-size: clamp(36px, 10vw, 40px); letter-spacing: -0.06em; }
  .hero-deck { font-size: 14px; }
  .current-cta { min-width: 184px; padding: 15px 18px; }
  .current-hero-video { object-position: 58% center; }
  .current-principles { grid-template-columns: 1fr; }
  .current-principles > * { min-height: 120px; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.12); }
  .principles-lead { grid-column: auto; }
  .current-section { padding: 78px 0; }
  .section-heading { grid-template-columns: 1fr; gap: 20px; }
  .assessment-options button { grid-template-columns: 82px 1fr; }
  .assessment-options i { display: none; }
  .route-list li { grid-template-columns: 34px 1fr; padding: 22px 4px; }
  .route-list li > p { grid-column: 2; }
  .route-list li > b { grid-column: 2; justify-self: start; }
  .rhythm-track, .rhythm-guidance { grid-template-columns: 1fr; }
  .rhythm-track article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .rhythm-track h3, .rhythm-track p { min-height: auto; }
  .rhythm-track article:last-child { border-bottom: 0; }
  .rhythm-guidance div { min-height: auto; border-right: 0; border-bottom: 1px solid rgba(255, 255, 255, 0.12); }
  .rhythm-guidance div:last-child { border-bottom: 0; }
  .course-figure img { aspect-ratio: 4 / 3; }
  .course-figure figcaption { grid-template-columns: 1fr; gap: 10px; }
  .course-modules summary { grid-template-columns: 1fr 22px; gap: 8px 14px; padding: 20px 4px; }
  .course-modules summary > span, .course-modules summary small { grid-column: 1; }
  .course-modules summary strong { grid-column: 1; }
  .course-modules summary svg { grid-column: 2; grid-row: 1 / 4; }
  .module-outcomes { padding-right: 0; padding-left: 0; }
  .practice-columns article { padding: 32px 22px; }
  .practice-title { grid-template-columns: 28px 1fr; }
  .practice-title span { grid-column: 2; margin-top: 6px; }
  .practice-columns li { grid-template-columns: 1fr; gap: 8px; padding: 20px 0; }
  .stroke-order { grid-template-columns: 1fr; }
  .stroke-order header, .stroke-order > * { grid-column: 1; min-height: auto; border-right: 0; }
  .stroke-order div { min-height: 150px; }
  .session-intro, .session-checklist { padding: 70px 22px; }
  .safety-kit { padding: 30px 22px; }
  .benefits-grid { grid-template-columns: 1fr; }
  .benefit-lead,
  .benefits-grid article:nth-child(2),
  .benefits-grid article:nth-child(3),
  .benefits-grid article:nth-child(4),
  .benefit-progress { grid-column: 1; }
  .benefit-lead { min-height: 330px !important; }
  .benefit-lead h3 { margin-top: 100px; }
  .benefit-progress { grid-template-columns: 34px 1fr; }
  .benefit-progress p, .benefit-progress span { grid-column: 2; }
  .faq-grid, .current-sources nav { grid-template-columns: 1fr; }
  .current-sources { padding: 48px 22px; }
  .current-footer { display: grid; gap: 10px; padding: 25px 22px 100px; }

  .lab-header { padding: 0 18px; }
  .lab-status span:not(.status-live) { display: none; }
  .lab-hero { min-height: 660px; padding: 65px 18px 30px; }
  .lab-title h1 { display: grid; gap: 10px; font-size: 100px; }
  .lab-title h1 i { display: none; }
  .lab-dashboard { right: 18px; bottom: 205px; left: 18px; grid-template-columns: repeat(3, 1fr); }
  .lab-dashboard div { min-height: 95px; padding: 13px; }
  .lab-dashboard strong { font-size: 24px; }
  .lab-line-diagram { width: calc(100% - 50px); margin: 0 25px; }
  .lab-start { right: 18px; bottom: 20px; width: 76px; height: 76px; }
  .lab-safety-strip { grid-template-columns: 1fr; gap: 8px; padding: 22px 18px; }
  .lab-safety-strip p { padding: 6px 0; border-left: 0; border-top: 1px solid rgba(7,27,36,.2); }
  .lab-assessment, .lab-program, .lab-session { grid-template-columns: 1fr; }
  .lab-program-head,
  .lab-levels,
  .lab-session-layout { grid-column: 1; }
  .lab-section-code { flex-direction: row; min-height: 70px; border-right: 0; border-bottom: 1px solid rgba(73,227,210,.22); }
  .lab-section-code b { font-size: 22px; }
  .lab-assessment-main { grid-template-columns: 1fr; }
  .lab-section-title { grid-column: auto; padding: 58px 22px 28px; }
  .lab-options { padding: 0 22px; }
  .lab-output { margin: 30px 22px 60px; }
  .lab-program-head { grid-template-columns: 1fr; gap: 30px; padding: 60px 22px 40px; }
  .lab-levels { grid-template-columns: 1fr; padding: 0 22px 70px; }
  .lab-session-meter { padding: 60px 22px; }
  .lab-drills { padding: 40px 22px 70px; }
  .lab-drills label { grid-template-columns: 24px 54px 1fr; }
  .lab-drills small { display: none; }
  .lab-footer { display: grid; gap: 12px; padding: 30px 22px 100px; }

  .variant-notes { background: var(--foam); }
  .notes-header { grid-template-columns: 1fr auto; }
  .notes-header p { display: none; }
  .notes-hero { grid-template-columns: 1fr; min-height: auto; padding: 70px 0 90px; }
  .notes-margin-note { display: none; }
  .notes-hero h1 { font-size: 51px; }
  .notes-water-figure { grid-column: 1; }
  .notes-thesis { grid-template-columns: 1fr; padding: 80px 18px; }
  .notes-thesis h2 { font-size: 41px; }
  .notes-route { padding: 80px 18px; }
  .notes-route header { grid-template-columns: 1fr; gap: 25px; }
  .notes-route ol { grid-template-columns: 1fr; }
  .notes-route li:nth-child(odd) { border-right: 0; }
  .notes-route li:nth-child(even) { padding-left: 0; }
  .notes-route li { grid-template-columns: 42px 1fr; }
  .notes-route li small { grid-column: 2; }
  .notes-assessment, .notes-session { padding: 80px 0; }
  .notes-prescription { grid-template-columns: 1fr; }
  .notes-prescription small { grid-column: 1; }
  .notes-session blockquote { padding: 50px 24px; }
  .notes-footer { display: grid; gap: 12px; padding: 30px 18px 100px; }

}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .enter, .swimmer-marker { animation: none; }
  .current-cta, .current-header-action, .current-menu-backdrop, .current-menu-sheet, .current-menu-close, .current-mobile-nav a, .course-modules summary svg, .safety-accordions summary svg, .faq-grid summary svg, .current-sources a, .lab-start { transition: none; }
}

@media (prefers-reduced-transparency: reduce) {
  .current-header-action-secondary,
  .current-menu-trigger { background: #f8fcfc; -webkit-backdrop-filter: none; backdrop-filter: none; }
  .current-menu-backdrop { background: rgba(8, 47, 73, 0.62); -webkit-backdrop-filter: none; backdrop-filter: none; }
}

/* Prototype picker, intentionally project-agnostic. */
.proto-picker {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2147483647;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border-radius: 999px;
  background: rgba(10, 10, 10, 0.82);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
  backdrop-filter: blur(12px) saturate(1.4);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.08) inset,
    0 8px 24px rgba(0, 0, 0, 0.24),
    0 2px 6px rgba(0, 0, 0, 0.12);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 13px;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-user-select: none;
}

.proto-picker-highlight {
  position: absolute;
  top: 4px;
  left: 0;
  height: 28px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  will-change: transform;
}

/* The slide is enabled only after first paint (data-ready), so load doesn't animate. */
.proto-picker[data-ready] .proto-picker-highlight {
  transition:
    transform 250ms cubic-bezier(0.23, 1, 0.32, 1),
    width 250ms cubic-bezier(0.23, 1, 0.32, 1);
}

@media (prefers-reduced-motion: reduce) {
  .proto-picker[data-ready] .proto-picker-highlight { transition: none; }
}

.proto-picker-item {
  position: relative; /* sits above the highlight */
  display: flex;
  align-items: center;
  height: 28px;
  padding: 0 12px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: rgba(255, 255, 255, 0.55);
  font: inherit;
  cursor: pointer;
  transition: color 150ms ease-out;
}

.proto-picker-item:hover {
  color: rgba(255, 255, 255, 0.85);
}

.proto-picker-item:active {
  transform: scale(0.97);
}

.proto-picker-item:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.4);
  outline-offset: 2px;
}

.proto-picker-item[data-active] {
  color: #fff;
}

.proto-picker-divider {
  width: 1px;
  height: 16px;
  margin: 0 4px;
  background: rgba(255, 255, 255, 0.12);
}

.proto-picker-replay {
  padding: 0 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
}

.proto-picker[data-position="top"] {
  bottom: auto;
  top: 24px;
}