:root {
  --paper: #f4fafc;
  --paper-soft: #ffffff;
  --paper-deep: #e7f3f6;
  --ink: #102a35;
  --ink-soft: #526b76;
  --muted: #556d77;
  --line: #d7e5e8;
  --line-strong: #9bb7bd;
  --orange: #ea5a24;
  --orange-dark: #c94418;
  --orange-soft: #fff0e9;
  --cta: #ff6b35;
  --cta-hover: #ff815b;
  --cta-ink: #ffffff;
  --mint: #7dd8c9;
  --mint-dark: #0f766e;
  --mint-soft: #e8f8f5;
  --cyan: #06b6d4;
  --cyan-soft: #e4f8fc;
  --navy: #173d52;
  --navy-deep: #071f2c;
  --navy-soft: #dceff5;
  --red: #e5484d;
  --yellow: #e6a62e;
  --blue: #397fce;
  --focus: #0284c7;
  --section-space: clamp(84px, 9vw, 138px);
  --shell: min(1200px, calc(100vw - 48px));
  --font-sans: "Be Vietnam Pro", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-heading: "Montserrat", "Be Vietnam Pro", system-ui, sans-serif;
  color-scheme: light;
}

html[data-theme="dark"] {
  --paper: #061722;
  --paper-soft: #0a2230;
  --paper-deep: #102d3c;
  --ink: #edf8fa;
  --ink-soft: #b7cbd0;
  --muted: #9bb6be;
  --line: #244554;
  --line-strong: #50727f;
  --orange: #ff7541;
  --orange-dark: #ff8a5d;
  --orange-soft: #3c241f;
  --cta: #ff7541;
  --cta-hover: #ff8b66;
  --cta-ink: #ffffff;
  --mint: #65d7c4;
  --mint-dark: #8de3d4;
  --mint-soft: #103a3a;
  --cyan: #4fd4eb;
  --cyan-soft: #0c3542;
  --navy: #9cd6e5;
  --navy-deep: #03131d;
  --navy-soft: #143849;
  --focus: #38bdf8;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html {
  overflow-x: clip;
  scroll-behavior: smooth;
  scroll-padding-top: 20px;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background:
    radial-gradient(circle at 12% 6%, color-mix(in srgb, var(--cyan) 8%, transparent), transparent 32rem),
    linear-gradient(180deg, var(--paper) 0%, color-mix(in srgb, var(--paper-soft) 64%, var(--paper)) 48%, var(--paper) 100%);
  color: var(--ink);
  font-family: var(--font-sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

button,
input,
textarea,
select { font: inherit; }

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

button { color: inherit; }
a { color: inherit; }
svg { display: block; }

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 72%, transparent);
  outline-offset: 4px;
}

.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  background: var(--paper-soft);
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform .2s ease;
}

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

.section-shell,
.footer-shell,
.footer-bottom,
.proof-shell {
  width: var(--shell);
  margin-inline: auto;
}

.section-block { padding-block: var(--section-space); }

.page-atmosphere {
  position: absolute;
  z-index: -2;
  inset: 0 0 auto;
  height: 1080px;
  overflow: hidden;
  pointer-events: none;
}

.page-atmosphere::before,
.page-atmosphere::after {
  position: absolute;
  border-radius: 50%;
  content: "";
  filter: blur(80px);
}

.page-atmosphere::before {
  top: -260px;
  left: -210px;
  width: 620px;
  height: 620px;
  background: color-mix(in srgb, var(--cyan) 11%, transparent);
}

.page-atmosphere::after {
  top: 190px;
  right: -260px;
  width: 690px;
  height: 690px;
  background: color-mix(in srgb, var(--mint) 14%, transparent);
}

.paper-grid {
  position: absolute;
  inset: 0;
  opacity: .42;
  background-image:
    linear-gradient(color-mix(in srgb, var(--ink) 4%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--ink) 4%, transparent) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 82%);
}

.orbit { display: none; }

.landing-tools {
  position: fixed;
  z-index: 80;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px;
  border: 1px solid color-mix(in srgb, var(--line-strong) 58%, transparent);
  border-radius: 16px;
  background: color-mix(in srgb, var(--paper-soft) 82%, transparent);
  box-shadow: 0 18px 50px color-mix(in srgb, var(--navy-deep) 15%, transparent);
  backdrop-filter: blur(18px) saturate(1.25);
}

.icon-button {
  position: relative;
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  place-items: center;
  border: 0;
  border-radius: 11px;
  background: transparent;
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease, transform .2s ease;
}

.icon-button:hover {
  background: var(--paper-deep);
  color: var(--mint-dark);
  transform: translateY(-1px);
}

.icon-button svg {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.theme-toggle { overflow: hidden; }

.theme-icon {
  position: absolute;
  transition: opacity .22s ease, transform .32s cubic-bezier(.22, 1, .36, 1);
}

.theme-icon-moon {
  opacity: 0;
  transform: translateY(18px) rotate(24deg);
}

html[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
  transform: translateY(-18px) rotate(-24deg);
}

html[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
  transform: none;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

::view-transition-new(root) {
  z-index: 1;
  clip-path: circle(0 at var(--theme-transition-x) var(--theme-transition-y));
  animation: themeReveal .62s cubic-bezier(.2, .75, .25, 1) forwards;
}

.theme-ripple-layer {
  position: fixed;
  z-index: 999;
  inset: 0;
  pointer-events: none;
  background: var(--theme-transition-color);
  clip-path: circle(0 at var(--theme-transition-x) var(--theme-transition-y));
}

.theme-ripple-layer.is-active { animation: themeReveal .62s cubic-bezier(.2, .75, .25, 1) forwards; }

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 21px;
  border: 1px solid transparent;
  border-radius: 13px;
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
  transition: background-color .2s ease, border-color .2s ease, color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.button:hover { transform: translateY(-2px); }

.button svg,
.text-link svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
  transition: transform .2s ease;
}

.button:hover svg { transform: translateX(4px); }

.button-primary {
  border-color: var(--cta);
  background: var(--cta);
  color: var(--cta-ink);
  text-shadow: 0 1px 1px rgba(76, 22, 5, .28);
  box-shadow:
    0 12px 30px color-mix(in srgb, var(--cta) 28%, transparent),
    inset 0 1px 0 rgba(255, 255, 255, .34);
}

.button-primary:hover {
  border-color: var(--cta-hover);
  background: var(--cta-hover);
}

.button-paper {
  border-color: color-mix(in srgb, #fff 58%, transparent);
  background: #fff;
  color: #102a35;
}

.hero {
  position: relative;
  display: grid;
  min-height: min(900px, 100svh);
  grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
  align-items: center;
  gap: clamp(38px, 5vw, 80px);
  padding-top: clamp(62px, 8vw, 112px);
  padding-bottom: clamp(84px, 9vw, 132px);
}

.hero::before {
  position: absolute;
  z-index: -1;
  top: 9%;
  bottom: 9%;
  left: calc(47% - 1px);
  width: 1px;
  background: linear-gradient(transparent, var(--line), transparent);
  content: "";
}

.hero-copy {
  position: relative;
  z-index: 4;
  max-width: 610px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 22px;
  color: var(--mint-dark);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 28px;
  height: 1px;
  background: currentColor;
  content: "";
}

.eyebrow-light { color: #8de3d4 !important; }

.hero h1,
.section-heading h2,
.method-intro h2,
.experience-copy h2,
.final-cta h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -.055em;
  line-height: 1.04;
  text-wrap: balance;
}

.hero h1 { font-size: clamp(46px, 5.2vw, 76px); }
.hero-line { display: inline; }

.hero-copy .eyebrow::before { display: none; }

.hero h1 em,
.section-heading h2 em {
  color: var(--orange);
  font-style: normal;
  font-weight: 700;
}

.hero-lead {
  max-width: 570px;
  margin: 28px 0 0;
  color: var(--ink-soft);
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-top: 34px;
}

.hero-actions .button-primary {
  position: relative;
  overflow: hidden;
}

.hero-actions .button-primary::before {
  position: absolute;
  top: -70%;
  bottom: -70%;
  left: -38%;
  width: 26%;
  background: linear-gradient(105deg, transparent, rgba(255, 255, 255, .92), transparent);
  content: "";
  pointer-events: none;
  transform: skewX(-19deg) translateX(-180%);
}

.js .hero-copy.is-visible .hero-actions .button-primary::before {
  animation: heroButtonFlare 3.8s cubic-bezier(.4, 0, .2, 1) 1.35s infinite;
}

.text-link {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 800;
  text-decoration: none;
}

.text-link-icon {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  transition: background-color .2s ease, color .2s ease, transform .2s ease;
}

.text-link-icon svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  stroke: none;
}

.text-link:hover .text-link-icon {
  background: var(--ink);
  color: var(--paper);
  transform: translateX(2px);
}

.language-proof {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-top: 38px;
}

.flag-stack {
  display: flex;
  padding-left: 8px;
}

.flag-stack span {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  margin-left: -8px;
  border: 2px solid var(--paper);
  border-radius: 50%;
  background: var(--paper-soft);
  font-size: 17px;
}

.language-proof p {
  margin: 0;
  font-size: 11px;
  line-height: 1.4;
}

.language-proof strong { font-size: 13px; }
.language-proof p span { color: var(--muted); }

.hero-stage {
  position: relative;
  min-width: 0;
  min-height: 680px;
}

.memory-scene {
  position: absolute;
  z-index: 0;
  inset: -14% calc((var(--shell) - 100vw) / 2 + 24px) -10% -25%;
  overflow: hidden;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse 50% 50% at 50% 50%, #000 0%, #000 72%, rgba(0, 0, 0, .9) 82%, transparent 100%);
  mask-image: radial-gradient(ellipse 50% 50% at 50% 50%, #000 0%, #000 72%, rgba(0, 0, 0, .9) 82%, transparent 100%);
}

.memory-scene canvas,
.memory-scene-fallback {
  position: absolute;
  width: 100%;
  height: 100%;
  inset: 0;
}

.memory-scene canvas {
  opacity: 0;
  transition: opacity .7s ease;
}

.memory-scene[data-ready="true"] canvas { opacity: .92; }

.memory-scene-fallback {
  opacity: .72;
  transition: opacity .45s ease;
}

.memory-scene[data-ready="true"] .memory-scene-fallback { opacity: 0; }

.memory-orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  border: 1px solid color-mix(in srgb, var(--cyan) 48%, transparent);
  border-radius: 50%;
  transform: translate(-50%, -50%) rotate(-11deg);
}

.memory-orbit-one { width: 78%; height: 38%; }

.memory-orbit-two {
  width: 52%;
  height: 71%;
  border-color: color-mix(in srgb, var(--mint) 58%, transparent);
  transform: translate(-50%, -50%) rotate(48deg);
}

.memory-token {
  position: absolute;
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--line-strong) 66%, transparent);
  border-radius: 13px;
  background: color-mix(in srgb, var(--paper-soft) 72%, transparent);
  color: var(--mint-dark);
  box-shadow: 0 14px 38px color-mix(in srgb, var(--navy-deep) 13%, transparent);
  font: 800 16px/1 var(--font-heading);
  backdrop-filter: blur(12px);
}

.memory-token-one { top: 12%; right: 20%; }
.memory-token-two { top: 41%; right: 4%; }
.memory-token-three { bottom: 13%; left: 19%; }
.memory-token-four { top: 28%; left: 3%; }

.hero-product {
  position: relative;
  z-index: 2;
  width: 92%;
  margin: 74px 0 0 auto;
}

.product-window {
  position: relative;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--line-strong) 72%, transparent);
  border-radius: 24px;
  background: color-mix(in srgb, var(--paper-soft) 86%, transparent);
  box-shadow:
    0 32px 90px color-mix(in srgb, var(--navy-deep) 16%, transparent),
    inset 0 1px 0 color-mix(in srgb, #fff 65%, transparent);
  backdrop-filter: blur(20px) saturate(1.15);
}

.product-window::after {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, color-mix(in srgb, #fff 16%, transparent), transparent 38%);
  content: "";
  pointer-events: none;
}

.product-topbar {
  position: relative;
  z-index: 2;
  display: grid;
  min-height: 58px;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 18px;
  border-bottom: 1px solid var(--line);
  font-size: 10px;
}

.mini-brand {
  display: flex;
  align-items: center;
  gap: 7px;
  font-weight: 800;
}

.mini-bolt {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  border-radius: 7px;
  background: var(--navy-deep);
  color: var(--orange);
  font-size: 14px;
}

.today-status {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-weight: 700;
}

.today-status > span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #20b881;
  box-shadow: 0 0 0 5px rgba(32, 184, 129, .12);
}

.product-menu-dots {
  display: flex;
  justify-content: flex-end;
  gap: 3px;
}

.product-menu-dots span {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--muted);
}

.product-layout {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 450px;
  grid-template-columns: 82px 1fr;
}

.product-rail {
  display: flex;
  align-items: center;
  flex-direction: column;
  padding: 23px 14px;
  border-right: 1px solid var(--line);
}

.rail-score {
  width: 100%;
  text-align: center;
}

.rail-score small,
.rail-streak small {
  display: block;
  color: var(--muted);
  font-size: 7px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.rail-score strong {
  display: block;
  margin-top: 6px;
  font: 700 23px/1 var(--font-heading);
}

.rail-score strong span {
  color: var(--muted);
  font-size: 10px;
}

.vertical-progress {
  position: relative;
  width: 5px;
  height: 225px;
  margin: 20px auto;
  overflow: hidden;
  border-radius: 999px;
  background: var(--paper-deep);
}

.vertical-progress span {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 78%;
  border-radius: inherit;
  background: linear-gradient(to top, var(--orange), #ff9a70);
}

.rail-streak {
  margin-top: auto;
  text-align: center;
}

.rail-streak > span { display: block; font-size: 17px; }
.rail-streak strong { display: block; margin: 3px 0; font-size: 18px; }

.study-preview {
  min-width: 0;
  padding: 22px;
}

.study-breadcrumb {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.demo-card {
  width: 100%;
  height: 285px;
  margin-top: 16px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  perspective: 1200px;
}

.demo-card-inner {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform .62s cubic-bezier(.2, .75, .25, 1);
}

.demo-card.is-flipped .demo-card-inner { transform: rotateY(180deg); }

.card-face {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  inset: 0;
  padding: 30px;
  border: 1px solid color-mix(in srgb, var(--line-strong) 72%, transparent);
  border-radius: 19px;
  background: linear-gradient(145deg, color-mix(in srgb, var(--paper-soft) 92%, transparent), color-mix(in srgb, var(--cyan-soft) 52%, var(--paper-soft)));
  backface-visibility: hidden;
}

.card-back { transform: rotateY(180deg); }

.card-kicker {
  position: absolute;
  top: 22px;
  left: 24px;
  color: var(--orange);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.card-level {
  position: absolute;
  top: 18px;
  right: 20px;
  padding: 5px 8px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 8px;
  font-weight: 800;
}

.card-face > strong {
  font: 700 clamp(32px, 4.2vw, 50px)/1 var(--font-heading);
  letter-spacing: -.045em;
  text-align: center;
}

.card-ipa {
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
}

.card-hint {
  position: absolute;
  right: 20px;
  bottom: 18px;
  left: 20px;
  color: var(--muted);
  font-size: 9px;
  text-align: center;
}

.card-hint kbd {
  margin-left: 5px;
  padding: 3px 6px;
  border: 1px solid var(--line);
  background: var(--paper-soft);
  font-size: 8px;
}

.card-example {
  margin-top: 20px;
  color: var(--ink-soft);
  font-size: 12px;
  font-style: italic;
  text-align: center;
}

.card-translation {
  max-width: 90%;
  margin-top: 9px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.5;
  text-align: center;
}

.review-buttons {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 14px;
}

.review-buttons button {
  display: flex;
  min-width: 0;
  min-height: 53px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 2px;
  padding: 7px 4px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--paper-soft) 72%, transparent);
  color: var(--ink-soft);
  cursor: pointer;
  transition: border-color .2s ease, background-color .2s ease, color .2s ease, transform .2s ease;
}

.review-buttons button:hover {
  border-color: var(--mint-dark);
  transform: translateY(-1px);
}

.review-buttons button.is-active {
  border-color: color-mix(in srgb, var(--orange) 42%, var(--line));
  background: var(--orange-soft);
  color: var(--orange-dark);
}

.review-buttons button > span {
  align-self: flex-end;
  margin: -3px 4px -11px 0;
  color: var(--muted);
  font-size: 7px;
}

.review-buttons strong { font-size: 9px; }
.review-buttons small { color: var(--muted); font-size: 7px; }

.review-feedback {
  min-height: 16px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 8px;
  text-align: center;
}

.floating-note {
  position: absolute;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 9px;
  max-width: 150px;
  padding: 10px 12px;
  border: 1px solid color-mix(in srgb, var(--line-strong) 70%, transparent);
  border-radius: 13px;
  background: color-mix(in srgb, var(--paper-soft) 86%, transparent);
  box-shadow: 0 18px 42px color-mix(in srgb, var(--navy-deep) 13%, transparent);
  color: var(--ink-soft);
  font-size: 8px;
  line-height: 1.35;
  backdrop-filter: blur(16px);
}

.floating-note > svg {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  fill: none;
  stroke: var(--orange);
  stroke-width: 1.8;
}

.floating-note strong { display: block; color: var(--ink); font-size: 9px; }
.note-srs { top: 140px; right: -18px; }
.note-progress { bottom: 58px; left: -34px; }

.note-check {
  display: grid;
  width: 24px;
  height: 24px;
  flex: 0 0 24px;
  place-items: center;
  border-radius: 50%;
  background: var(--mint-soft);
  color: var(--mint-dark);
}

.note-check svg {
  width: 13px;
  height: 13px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
}

.proof-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper-soft) 62%, transparent);
}

.proof-shell {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.proof-shell article {
  display: flex;
  min-width: 0;
  min-height: 116px;
  align-items: flex-start;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
  padding: 24px 18px;
  border-right: 1px solid var(--line);
}

.proof-shell article:first-child { border-left: 1px solid var(--line); }

.proof-shell strong {
  color: var(--mint-dark);
  font: 700 clamp(23px, 2vw, 31px)/1 var(--font-heading);
  letter-spacing: -.04em;
}

.proof-shell span {
  color: var(--ink-soft);
  font-size: 9px;
  font-weight: 700;
  line-height: 1.5;
}

.section-heading {
  max-width: 800px;
  margin-bottom: clamp(44px, 6vw, 74px);
}

.section-heading h2,
.method-intro h2,
.experience-copy h2 { font-size: clamp(38px, 5vw, 66px); }

.section-heading > p:last-child {
  max-width: 650px;
  margin: 23px 0 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

.section-heading-row {
  display: flex;
  max-width: none;
  align-items: flex-end;
  justify-content: space-between;
  gap: 64px;
}

.section-heading-row > div { max-width: 760px; }

.section-heading-row > p:last-child {
  max-width: 330px;
  margin: 0 0 8px;
}

.feature-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.feature-grid::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--line);
  content: "";
}

.feature-card {
  position: relative;
  display: grid;
  min-height: 395px;
  grid-template-rows: 1fr auto;
  gap: 28px;
  padding: clamp(30px, 4vw, 48px);
}

.feature-card:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }

.feature-card::after {
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 2px;
  background: var(--cyan);
  content: "";
  transition: width .45s cubic-bezier(.22, 1, .36, 1);
}

.feature-card:hover::after { width: 100%; }

.feature-copy {
  position: relative;
  max-width: 520px;
}

.feature-index {
  display: block;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.feature-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-left: 2px solid var(--mint-dark);
  background: var(--mint-soft);
  color: var(--mint-dark);
}

.feature-icon svg {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.feature-card h3 {
  max-width: 440px;
  margin: 22px 0 0;
  font: 700 clamp(22px, 2.1vw, 30px)/1.2 var(--font-heading);
  letter-spacing: -.035em;
}

.feature-card p {
  max-width: 460px;
  margin: 15px 0 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.75;
}

.srs-visual,
.grammar-visual,
.library-visual,
.social-visual {
  min-height: 112px;
  padding: 20px;
  border-top: 1px solid var(--line);
  background: linear-gradient(90deg, color-mix(in srgb, var(--cyan-soft) 62%, transparent), transparent);
}

.srs-now {
  display: block;
  color: var(--mint-dark);
  font-size: 9px;
  font-weight: 800;
  text-transform: uppercase;
}

.srs-line {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 32px;
  margin-top: 7px;
}

.srs-line::before {
  position: absolute;
  right: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--orange), var(--mint), var(--cyan));
  content: "";
  transform-origin: left center;
}

.srs-line > span,
.srs-line > i {
  --srs-dot-color: var(--cyan);
  position: relative;
  width: 9px;
  height: 9px;
  border: 2px solid var(--paper-soft);
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 1px var(--line-strong);
}

.srs-line > span {
  --srs-dot-color: var(--orange);
  width: 13px;
  height: 13px;
  background: var(--orange);
}

.srs-labels {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 7px;
  font-weight: 700;
}

.grammar-tabs {
  display: flex;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 8px;
  font-weight: 800;
}

.grammar-tabs span { padding-bottom: 8px; }

.grammar-tabs .active {
  position: relative;
  margin-bottom: -1px;
  color: var(--orange);
}

.grammar-tabs .active::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--orange);
  content: "";
  transform-origin: left center;
}

.grammar-visual code {
  display: block;
  margin: 16px 0 13px;
  color: var(--ink);
  font: 700 13px/1.3 var(--font-heading);
}

.grammar-progress {
  display: flex;
  align-items: center;
  gap: 10px;
}

.grammar-progress-track {
  position: relative;
  display: block;
  flex: 1;
  height: 5px;
  overflow: hidden;
  border-radius: 99px;
  background: var(--paper-deep);
}

.grammar-progress-track i {
  position: relative;
  display: block;
  width: 75%;
  height: 100%;
  overflow: hidden;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--mint-dark), var(--mint));
  transform-origin: left center;
}

.grammar-progress-track i::after {
  position: absolute;
  inset: -2px auto -2px -34%;
  width: 28%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .88), transparent);
  content: "";
  opacity: 0;
  transform: skewX(-18deg) translateX(0);
}

.grammar-progress strong { color: var(--mint-dark); font-size: 8px; }

.library-visual {
  display: flex;
  align-content: flex-start;
  flex-wrap: wrap;
  gap: 8px;
}

.library-visual span {
  padding: 8px 10px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper-soft) 72%, transparent);
  color: var(--ink-soft);
  font-size: 8px;
  font-weight: 800;
}

.social-visual {
  display: grid;
  align-items: center;
}

.avatar-stack {
  display: flex;
  padding-left: 8px;
}

.avatar-stack span {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  margin-left: -8px;
  border: 2px solid var(--paper-soft);
  border-radius: 50%;
  background: var(--navy-soft);
  color: var(--navy);
  font-size: 9px;
  font-weight: 800;
}

.avatar-stack span:last-child {
  width: auto;
  padding: 0 11px;
  border-radius: 99px;
  background: var(--mint-soft);
  color: var(--mint-dark);
}

.js .feature-srs .srs-line::before,
.js .feature-grammar .grammar-tabs .active::after,
.js .feature-grammar .grammar-progress-track i {
  transform: scaleX(0);
}

.js .feature-srs .srs-line > *,
.js .feature-grammar .grammar-visual code,
.js .feature-grammar .grammar-progress strong,
.js .feature-library .library-visual span,
.js .feature-social .avatar-stack span {
  opacity: 0;
}

.js .feature-srs .srs-line > * { transform: scale(.35); }
.js .feature-grammar .grammar-visual code { transform: translateY(7px); }
.js .feature-grammar .grammar-progress strong { transform: translateX(-5px); }
.js .feature-library .library-visual span { transform: translateY(9px) scale(.92); }
.js .feature-social .avatar-stack span { transform: translateX(-12px) scale(.72); }

.js .feature-srs.is-visible .srs-line::before {
  animation: srsTimelineDraw .88s cubic-bezier(.22, 1, .36, 1) .42s both;
}

.js .feature-srs.is-visible .srs-line > * {
  animation:
    srsNodeArrive .48s cubic-bezier(.22, 1, .36, 1) var(--srs-arrive-delay) both,
    srsDotGlow 3s ease-in-out var(--srs-glow-delay) infinite;
  animation-play-state: running, paused;
}

.js .feature-srs.is-visible.is-looping .srs-line > * { animation-play-state: running, running; }

.js .feature-srs.is-visible .srs-line > :nth-child(1) { --srs-arrive-delay: .44s; --srs-glow-delay: 1.2s; }
.js .feature-srs.is-visible .srs-line > :nth-child(2) { --srs-arrive-delay: .58s; --srs-glow-delay: 1.8s; }
.js .feature-srs.is-visible .srs-line > :nth-child(3) { --srs-arrive-delay: .72s; --srs-glow-delay: 2.4s; }
.js .feature-srs.is-visible .srs-line > :nth-child(4) { --srs-arrive-delay: .86s; --srs-glow-delay: 3s; }
.js .feature-srs.is-visible .srs-line > :nth-child(5) { --srs-arrive-delay: 1s; --srs-glow-delay: 3.6s; }

.js .feature-grammar.is-visible .grammar-tabs .active::after {
  animation: grammarUnderlineDraw .42s ease-out .48s both;
}

.js .feature-grammar.is-visible .grammar-visual code,
.js .feature-grammar.is-visible .grammar-progress strong {
  animation: grammarValueReveal .46s cubic-bezier(.22, 1, .36, 1) both;
}

.js .feature-grammar.is-visible .grammar-visual code { animation-delay: .52s; }
.js .feature-grammar.is-visible .grammar-progress strong { animation-delay: 1.06s; }

.js .feature-grammar.is-visible .grammar-progress-track i {
  animation: grammarProgressFill .82s cubic-bezier(.22, 1, .36, 1) .62s both;
}

.js .feature-grammar.is-visible .grammar-progress-track i::after {
  animation: grammarProgressBoost 2.2s cubic-bezier(.4, 0, .2, 1) 1.55s infinite;
  animation-play-state: paused;
}

.js .feature-grammar.is-visible.is-looping .grammar-progress-track i::after {
  animation-play-state: running;
}

.js .feature-library.is-visible .library-visual span {
  animation:
    libraryChipLoad .5s cubic-bezier(.22, 1, .36, 1) var(--chip-load-delay) both,
    libraryChipPulse 3.2s ease-in-out var(--chip-pulse-delay) infinite;
  animation-play-state: running, paused;
}

.js .feature-library.is-visible.is-looping .library-visual span { animation-play-state: running, running; }

.js .feature-library.is-visible .library-visual span:nth-child(1) { --chip-load-delay: .42s; --chip-pulse-delay: 1.2s; }
.js .feature-library.is-visible .library-visual span:nth-child(2) { --chip-load-delay: .53s; --chip-pulse-delay: 2s; }
.js .feature-library.is-visible .library-visual span:nth-child(3) { --chip-load-delay: .64s; --chip-pulse-delay: 2.8s; }
.js .feature-library.is-visible .library-visual span:nth-child(4) { --chip-load-delay: .75s; --chip-pulse-delay: 3.6s; }

.js .feature-social.is-visible .avatar-stack span {
  animation: socialAvatarJoin .52s cubic-bezier(.2, 1.25, .35, 1) both;
}

.js .feature-social.is-visible .avatar-stack span:nth-child(1) { animation-delay: .42s; }
.js .feature-social.is-visible .avatar-stack span:nth-child(2) { animation-delay: .54s; }
.js .feature-social.is-visible .avatar-stack span:nth-child(3) { animation-delay: .66s; }
.js .feature-social.is-visible .avatar-stack span:nth-child(4) { animation-delay: .78s; }

.method {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(120deg, color-mix(in srgb, var(--cyan) 8%, transparent), transparent 45%),
    var(--navy-deep);
  color: #effbfc;
}

.method::after {
  position: absolute;
  top: -240px;
  right: -170px;
  width: 560px;
  height: 560px;
  border: 1px solid rgba(125, 216, 201, .16);
  border-radius: 50%;
  content: "";
  box-shadow: 0 0 0 80px rgba(125, 216, 201, .035), 0 0 0 160px rgba(125, 216, 201, .025);
}

.method-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
  gap: clamp(56px, 9vw, 130px);
}

.method-intro { align-self: center; }

.method-intro h2 {
  max-width: 540px;
  color: #f4fbfc;
}

.method-intro > p:not(.eyebrow) {
  max-width: 500px;
  margin: 23px 0 32px;
  color: #b9ced4;
  font-size: 15px;
  line-height: 1.75;
}

.method-steps {
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(190, 224, 230, .25);
  list-style: none;
}

.method-steps li {
  display: grid;
  grid-template-columns: 58px 1fr;
  align-items: start;
  gap: 20px;
  padding: 25px 0;
  border-bottom: 1px solid rgba(190, 224, 230, .25);
}

.step-number {
  color: #7dd8c9;
  font: 700 18px/1 var(--font-heading);
}

.method-steps h3 {
  margin: 0;
  color: #f4fbfc;
  font-size: 16px;
  letter-spacing: -.02em;
}

.method-steps p {
  margin: 8px 0 0;
  color: #a9c1c8;
  font-size: 12px;
  line-height: 1.65;
}

.language-showcase {
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.language-tabs {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
}

.language-tabs button {
  position: relative;
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  cursor: pointer;
}

.language-tabs button:last-child { border-right: 0; }

.language-tabs button::after {
  position: absolute;
  right: 14%;
  bottom: -1px;
  left: 14%;
  height: 2px;
  background: var(--cyan);
  content: "";
  transform: scaleX(0);
  transition: transform .22s ease;
}

.language-tabs button:hover,
.language-tabs button.is-active {
  background: color-mix(in srgb, var(--cyan-soft) 42%, transparent);
  color: var(--ink);
}

.language-tabs button.is-active::after { transform: scaleX(1); }
.language-tabs button span { font-size: 20px; }

.language-panel {
  position: relative;
  display: grid;
  min-height: 315px;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, .8fr);
  align-items: center;
  gap: clamp(46px, 8vw, 110px);
  padding: clamp(38px, 6vw, 72px);
  background: linear-gradient(110deg, color-mix(in srgb, var(--cyan-soft) 48%, transparent), transparent 62%);
}

.language-panel.is-changing > * { animation: languagePanelSwap .34s ease both; }

.language-main {
  display: flex;
  align-items: center;
  gap: 25px;
}

.language-flag {
  display: grid;
  width: 82px;
  height: 82px;
  flex: 0 0 82px;
  place-items: center;
  border-left: 3px solid var(--cyan);
  background: color-mix(in srgb, var(--paper-soft) 70%, transparent);
  font-size: 42px;
}

.language-native {
  margin: 0 0 6px;
  color: var(--mint-dark);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.language-main h3 {
  margin: 0;
  font: 700 clamp(28px, 3vw, 42px)/1.1 var(--font-heading);
  letter-spacing: -.04em;
}

.language-main div > p:last-child {
  max-width: 540px;
  margin: 13px 0 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.7;
}

.language-details { border-top: 1px solid var(--line); }

.language-details > div {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 15px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.language-details small {
  color: var(--muted);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.language-details strong { font-size: 11px; }

.language-badge {
  position: absolute;
  top: 22px;
  right: 26px;
  padding: 6px 9px;
  border: 1px solid var(--line);
  color: var(--mint-dark);
  font-size: 8px;
  font-weight: 800;
}

.experience { padding-top: 0; }

.experience-card {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: clamp(52px, 8vw, 105px);
}

.experience-copy > p:not(.eyebrow) {
  margin: 23px 0 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.75;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 700;
}

.check-list li > span {
  display: grid;
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  place-items: center;
  border-radius: 50%;
  background: var(--mint-soft);
  color: var(--mint-dark);
}

.check-list svg {
  width: 12px;
  height: 12px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.3;
}

.day-plan {
  border: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--paper-soft) 78%, transparent);
  box-shadow: 22px 22px 0 color-mix(in srgb, var(--cyan-soft) 68%, transparent);
}

.day-plan-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.day-plan-header strong { color: var(--orange); font-size: 13px; }

.day-plan ol {
  margin: 0;
  padding: 8px 24px;
  list-style: none;
}

.day-plan li {
  display: grid;
  grid-template-columns: 48px 12px 1fr auto;
  align-items: center;
  gap: 13px;
  min-height: 77px;
  border-bottom: 1px solid var(--line);
}

.day-plan li:last-child { border-bottom: 0; }

.day-plan .time {
  color: var(--muted);
  font: 700 9px/1 var(--font-heading);
}

.day-plan li > i {
  width: 9px;
  height: 9px;
  border: 2px solid var(--paper-soft);
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 1px var(--line-strong);
}

.day-plan li strong,
.day-plan-complete strong { display: block; font-size: 11px; }

.day-plan li small,
.day-plan-complete small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 8px;
}

.day-plan li b { color: var(--mint-dark); font-size: 9px; }

.day-plan-complete {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 19px 24px;
  border-top: 1px solid var(--line);
  background: var(--mint-soft);
}

.day-plan-complete > span {
  display: grid;
  width: 31px;
  height: 31px;
  place-items: center;
  border-radius: 50%;
  background: var(--mint-dark);
  color: var(--paper-soft);
}

.day-plan-complete svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.4;
}

.principles { padding-top: 36px; }

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.principle-grid article {
  min-height: 250px;
  padding: 34px;
  border-right: 1px solid var(--line);
}

.principle-grid article:last-child { border-right: 0; }

.principle-grid article > span {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-left: 2px solid var(--cyan);
  background: var(--cyan-soft);
  color: var(--mint-dark);
}

.principle-grid svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.principle-grid h3 {
  margin: 25px 0 0;
  font-size: 17px;
  letter-spacing: -.025em;
}

.principle-grid p {
  margin: 12px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.7;
}

.final-cta {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(28px, 5vw, 58px);
  margin-bottom: var(--section-space);
  overflow: hidden;
  padding: clamp(34px, 5vw, 56px);
  border-top: 1px solid #315565;
  border-bottom: 1px solid #315565;
  background: transparent;
  color: var(--ink);
}

.cta-mark {
  display: grid;
  width: 76px;
  height: 76px;
  place-items: center;
  overflow: hidden;
  border-left: 2px solid var(--orange);
  background: rgba(255, 255, 255, .06);
}

.cta-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.cta-copy { max-width: 680px; }
.cta-copy .eyebrow {
  margin-bottom: 10px;
  color: var(--mint-dark) !important;
}

.final-cta .button-paper {
  border-color: var(--line-strong);
  box-shadow: 0 10px 30px color-mix(in srgb, var(--navy-deep) 9%, transparent);
}

.final-cta h2 { font-size: clamp(29px, 4vw, 47px); }

.site-footer {
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper-soft) 62%, transparent);
}

.footer-shell {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 70px;
  padding: 62px 0 48px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.02em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 9px;
  background: var(--navy-deep);
  color: var(--orange);
}

.footer-shell > div:first-child > p {
  margin: 15px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px;
}

.footer-links > div {
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  gap: 11px;
}

.footer-links strong {
  margin-bottom: 4px;
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.footer-links a {
  color: var(--muted);
  font-size: 11px;
  text-decoration: none;
}

.footer-links a:hover { color: var(--mint-dark); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px 0 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 9px;
  text-align: center;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .68s ease, transform .68s cubic-bezier(.22, 1, .36, 1);
  transition-delay: var(--reveal-delay, 0ms);
}

.js [data-reveal="left"] { transform: translateX(-24px); }
.js [data-reveal="right"] { transform: translateX(24px); }

.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

.js [data-reveal-stagger] > * {
  opacity: 0;
  filter: blur(5px);
  transform: translate3d(0, 16px, 0) scale(.985);
}

.js [data-reveal-stagger].is-visible > *,
.js .is-visible [data-reveal-stagger] > * {
  animation: landingElementReveal .66s cubic-bezier(.22, 1, .36, 1) both;
  animation-delay: calc(var(--reveal-delay, 0ms) + var(--stagger-delay, 0ms));
}

.js [data-reveal-stagger] > :nth-child(2) { --stagger-delay: 75ms; }
.js [data-reveal-stagger] > :nth-child(3) { --stagger-delay: 150ms; }
.js [data-reveal-stagger] > :nth-child(4) { --stagger-delay: 225ms; }
.js [data-reveal-stagger] > :nth-child(5) { --stagger-delay: 300ms; }
.js [data-reveal-stagger] > :nth-child(6) { --stagger-delay: 375ms; }
.js [data-reveal-stagger] > :nth-child(n + 7) { --stagger-delay: 420ms; }

@keyframes landingElementReveal {
  60% { opacity: 1; }
  to {
    opacity: 1;
    filter: blur(0);
    transform: none;
  }
}

@keyframes srsTimelineDraw {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

@keyframes srsNodeArrive {
  from { opacity: 0; transform: scale(.35); }
  70% { opacity: 1; transform: scale(1.28); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes srsDotGlow {
  0%, 18% {
    filter: brightness(1.55);
    box-shadow:
      0 0 0 1px var(--line-strong),
      0 0 0 6px color-mix(in srgb, var(--srs-dot-color) 23%, transparent),
      0 0 18px color-mix(in srgb, var(--srs-dot-color) 82%, transparent);
    transform: scale(1.24);
  }
  34%, 100% {
    filter: none;
    box-shadow: 0 0 0 1px var(--line-strong);
    transform: scale(1);
  }
}

@keyframes grammarUnderlineDraw {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

@keyframes grammarValueReveal {
  from { opacity: 0; transform: translateY(7px); }
  to { opacity: 1; transform: none; }
}

@keyframes grammarProgressFill {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

@keyframes grammarProgressBoost {
  0%, 18% { opacity: 0; transform: skewX(-18deg) translateX(0); }
  30% { opacity: .95; }
  68% { opacity: .8; }
  82%, 100% { opacity: 0; transform: skewX(-18deg) translateX(470%); }
}

@keyframes libraryChipLoad {
  from { opacity: 0; transform: translateY(9px) scale(.92); }
  72% { opacity: 1; transform: translateY(-2px) scale(1.025); }
  to { opacity: 1; transform: none; }
}

@keyframes libraryChipPulse {
  0%, 20% {
    border-color: color-mix(in srgb, var(--mint) 72%, var(--line));
    box-shadow: 0 7px 20px color-mix(in srgb, var(--mint) 20%, transparent);
    color: var(--mint-dark);
    transform: translateY(-6px) scale(1.035);
  }
  36%, 100% {
    border-color: var(--line);
    box-shadow: none;
    color: var(--ink-soft);
    transform: none;
  }
}

@keyframes socialAvatarJoin {
  from { opacity: 0; transform: translateX(-12px) scale(.72); }
  72% { opacity: 1; transform: translateX(2px) scale(1.06); }
  to { opacity: 1; transform: none; }
}

@keyframes themeReveal {
  to { clip-path: circle(150vmax at var(--theme-transition-x) var(--theme-transition-y)); }
}

@keyframes languagePanelSwap {
  from { opacity: .35; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

@keyframes heroButtonFlare {
  0%, 45% { opacity: 0; transform: skewX(-19deg) translateX(-180%); }
  52% { opacity: .95; }
  68% { opacity: .72; }
  76%, 100% { opacity: 0; transform: skewX(-19deg) translateX(720%); }
}

@media (max-width: 1180px) {
  :root { --shell: min(100% - 32px, 920px); }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 52px;
    padding-top: 78px;
  }

  .hero::before { display: none; }

  .hero-copy {
    max-width: 760px;
    margin-inline: auto;
    text-align: center;
  }

  .hero-copy .eyebrow,
  .hero-actions,
  .language-proof { justify-content: center; }

  .hero-lead { margin-inline: auto; }

  .hero-stage {
    width: min(780px, 100%);
    min-height: 640px;
    margin-inline: auto;
  }

  .hero-product {
    width: 86%;
    margin: 62px auto 0;
  }

  .memory-scene { inset: -12% -10%; }

  .proof-shell { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .proof-shell article:nth-child(3) { border-right: 1px solid var(--line); }
  .proof-shell article:nth-child(-n + 3) { border-bottom: 1px solid var(--line); }

  .method-shell,
  .experience-card { grid-template-columns: 1fr; }

  .method-intro,
  .experience-copy { max-width: 700px; }

  .language-panel {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .principle-grid article { padding: 28px; }
}

@media (max-width: 720px) {
  :root {
    --shell: calc(100% - 24px);
    --section-space: 86px;
  }

  .landing-tools {
    right: 12px;
    bottom: max(12px, env(safe-area-inset-bottom));
  }

  .hero {
    gap: 42px;
    padding-top: 54px;
    padding-bottom: 76px;
  }

  .hero h1 {
    font-size: clamp(27px, 8.9vw, 40px);
    letter-spacing: -.065em;
  }

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

  .hero-lead {
    font-size: 14px;
    line-height: 1.7;
  }

  .hero-actions {
    flex-direction: column;
    gap: 10px;
  }

  .hero-actions .button { width: min(100%, 320px); }

  .language-proof {
    align-items: center;
    flex-direction: column;
  }

  .hero-stage { min-height: 590px; }
  .memory-scene { inset: -5% -26%; }

  .hero-product {
    width: 100%;
    margin-top: 72px;
  }

  .product-window { border-radius: 18px; }

  .product-topbar {
    grid-template-columns: 1fr auto;
    padding: 0 14px;
  }

  .today-status { display: none; }

  .product-layout {
    min-height: 0;
    grid-template-columns: 1fr;
  }

  .product-rail {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 12px;
    padding: 13px 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .rail-score { text-align: left; }

  .rail-score small,
  .rail-streak small,
  .rail-score strong,
  .rail-streak > span,
  .rail-streak strong { display: inline; }

  .rail-score strong {
    margin-left: 6px;
    font-size: 17px;
  }

  .vertical-progress {
    width: 100%;
    height: 5px;
    margin: 0;
  }

  .vertical-progress span {
    width: 78%;
    height: 100%;
  }

  .rail-streak {
    margin: 0;
    text-align: right;
  }

  .study-preview { padding: 16px 12px 18px; }
  .demo-card { height: 260px; }

  .card-face {
    padding: 24px 17px;
    border-radius: 15px;
  }

  .card-face > strong { font-size: clamp(28px, 10vw, 40px); }
  .floating-note { display: none; }

  .proof-shell {
    width: var(--shell);
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-inline: auto;
  }

  .proof-shell article {
    min-height: 100px;
    border-bottom: 1px solid var(--line) !important;
  }

  .proof-shell article:nth-child(odd) { border-left: 1px solid var(--line); }
  .proof-shell article:nth-last-child(-n + 2) { border-bottom: 0 !important; }

  .section-heading h2,
  .method-intro h2,
  .experience-copy h2 { font-size: clamp(34px, 10vw, 49px); }

  .section-heading-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 18px;
  }

  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid::before { display: none; }

  .feature-card {
    min-height: 350px;
    border-bottom: 1px solid var(--line);
  }

  .feature-card:last-child { border-bottom: 0; }
  .method-shell { gap: 54px; }

  .language-tabs {
    overflow-x: auto;
    grid-template-columns: repeat(5, minmax(78px, 1fr));
    scrollbar-width: none;
  }

  .language-tabs button {
    min-height: 68px;
    flex-direction: column;
    gap: 3px;
    padding: 8px 5px;
    font-size: 8px;
  }

  .language-panel {
    min-height: 0;
    padding: 34px 22px;
  }

  .language-main {
    align-items: flex-start;
    flex-direction: column;
    gap: 18px;
  }

  .language-flag {
    width: 70px;
    height: 70px;
    flex-basis: 70px;
    font-size: 36px;
  }

  .language-badge {
    top: 20px;
    right: 18px;
  }

  .day-plan { box-shadow: 10px 10px 0 color-mix(in srgb, var(--cyan-soft) 68%, transparent); }
  .day-plan ol { padding-inline: 16px; }

  .day-plan li {
    grid-template-columns: 40px 10px 1fr;
    gap: 9px;
  }

  .day-plan li b { display: none; }
  .principle-grid { grid-template-columns: 1fr; }

  .principle-grid article {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .principle-grid article:last-child { border-bottom: 0; }

  .final-cta {
    grid-template-columns: 1fr;
    justify-items: start;
    padding: 34px 24px;
  }

  .final-cta .button { width: 100%; }

  .footer-shell {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .footer-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 34px;
  }

  .footer-bottom { padding-bottom: calc(80px + env(safe-area-inset-bottom)); }
}

@media (max-width: 420px) {
  .landing-tools { max-width: calc(100vw - 24px); }

  .hero-copy .eyebrow {
    justify-content: center;
    font-size: 8px;
  }

  .review-buttons { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .review-buttons button { min-height: 50px; }

  .review-buttons button > span {
    align-self: center;
    margin: 0;
  }

  .review-feedback { font-size: 7px; }
  .hero-stage { min-height: 660px; }

  .feature-card {
    min-height: 330px;
    padding: 30px 18px;
  }

  .method-steps li {
    grid-template-columns: 42px 1fr;
    gap: 12px;
  }

  .language-details > div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .footer-links { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .001ms !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .js [data-reveal-stagger] > * {
    opacity: 1;
    animation: none !important;
    filter: none;
    transform: none;
  }

  .js .feature-srs .srs-line::before,
  .js .feature-srs .srs-line > *,
  .js .feature-grammar .grammar-tabs .active::after,
  .js .feature-grammar .grammar-visual code,
  .js .feature-grammar .grammar-progress-track i,
  .js .feature-grammar .grammar-progress strong,
  .js .feature-library .library-visual span,
  .js .feature-social .avatar-stack span {
    opacity: 1;
    animation: none !important;
    transform: none;
  }

  .js .feature-grammar .grammar-progress-track i::after { display: none; }
  .js .hero-copy .hero-actions .button-primary::before { display: none; }

  .memory-scene canvas { display: none; }
  .memory-scene-fallback { opacity: .72 !important; }
}

@media print {
  .landing-tools,
  .hero-stage,
  .page-atmosphere,
  .final-cta,
  .site-footer { display: none; }

  body {
    background: #fff;
    color: #111;
  }

  .section-block { padding-block: 30px; }
}