:root {
  --ink: #08316f;
  --ink-soft: #315482;
  --blue: #1689ff;
  --blue-deep: #075fd2;
  --cyan: #65d7ff;
  --orange: #ff7a2f;
  --gold: #ffc83d;
  --green: #3fbd65;
  --mint: #eaffd9;
  --paper: #ffffff;
  --paper-soft: rgba(255, 255, 255, 0.72);
  --sky: #cfecff;
  --line: rgba(8, 49, 111, 0.16);
  --shadow-blue: 0 26px 70px rgba(22, 137, 255, 0.24);
  --shadow-card: 0 18px 46px rgba(8, 49, 111, 0.14);
  --radius-xl: 34px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --max: 1180px;
  --display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --sans: "Noto Sans SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 82% 0%, rgba(255, 226, 111, 0.42), transparent 28rem),
    linear-gradient(180deg, #d8f2ff 0%, #f7fdff 34%, #f7fff0 70%, #fffaf1 100%);
  font-family: var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

button,
summary {
  font: inherit;
}

.skip-link {
  position: fixed;
  z-index: 100;
  left: 18px;
  top: 14px;
  padding: 10px 14px;
  border-radius: 999px;
  color: #fff;
  background: var(--blue-deep);
  transform: translateY(-180%);
  transition: transform 0.2s ease;
}

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

.site-header {
  position: fixed;
  z-index: 50;
  top: 0;
  left: 0;
  right: 0;
  padding: 18px clamp(18px, 4vw, 44px);
  transition: padding 0.24s ease, background 0.24s ease, box-shadow 0.24s ease;
}

.site-header.is-scrolled {
  padding-top: 10px;
  padding-bottom: 10px;
  background: rgba(232, 247, 255, 0.86);
  box-shadow: 0 12px 34px rgba(8, 49, 111, 0.12);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(100%, var(--max));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #12306f;
  font-weight: 900;
  letter-spacing: 0.05em;
}

.brand span {
  font-size: clamp(18px, 2vw, 22px);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 28px);
  color: rgba(8, 49, 111, 0.78);
  font-size: 15px;
  font-weight: 700;
}

.nav-links a {
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 3px;
  border-radius: 99px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s ease;
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  transform: scaleX(1);
}

.nav-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 999px;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.nav-cta {
  padding: 10px 18px;
  color: #fff;
  background: linear-gradient(135deg, var(--orange), #ffab2e);
  box-shadow: 0 12px 28px rgba(255, 122, 47, 0.28);
}

.hero {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  padding: 118px clamp(18px, 4vw, 44px) 66px;
  background:
    radial-gradient(circle at 83% 9%, rgba(255, 255, 255, 0.96) 0 3.2rem, rgba(255, 244, 161, 0.72) 3.4rem, transparent 12rem),
    radial-gradient(circle at 12% 34%, rgba(255, 255, 255, 0.85), transparent 16rem),
    linear-gradient(160deg, #bcecff 0%, #7fc9ff 48%, #eaffff 78%, #eaffd9 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, transparent 0 55%, rgba(255, 255, 255, 0.42) 55% 56%, transparent 56%),
    linear-gradient(115deg, transparent 0 65%, rgba(255, 255, 255, 0.32) 65% 66%, transparent 66%),
    radial-gradient(circle at 78% 6%, rgba(255, 255, 255, 0.56), transparent 15rem);
  opacity: 0.88;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: min(100%, var(--max));
  min-height: calc(100svh - 190px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.98fr);
  gap: clamp(30px, 5vw, 70px);
  align-items: center;
}

.eyebrow,
.section-kicker {
  width: fit-content;
  margin: 0 0 14px;
  padding: 7px 14px;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(90deg, var(--blue-deep), #3aa8ff);
  box-shadow: 0 10px 24px rgba(7, 95, 210, 0.22);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0;
  max-width: 720px;
  color: var(--blue-deep);
  font-family: var(--display);
  font-size: clamp(54px, 8.2vw, 108px);
  line-height: 0.94;
  font-weight: 900;
  letter-spacing: -0.055em;
  text-shadow:
    0 4px 0 #fff,
    0 10px 22px rgba(8, 49, 111, 0.18);
}

.hero h1 span {
  display: block;
  color: var(--orange);
  letter-spacing: -0.03em;
}

.hero-lead {
  max-width: 610px;
  margin: 24px 0 0;
  color: #234a77;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.78;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.hero-trial {
  position: absolute;
  display: inline-flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  width: fit-content;
  max-width: min(100%, 650px);
  margin-top: 24px;
  padding: 10px 14px 10px 12px;
  border: 3px solid rgba(255, 255, 255, 0.82);
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(90deg, #ff5f2a, #ff9b2f);
  box-shadow: 0 18px 34px rgba(255, 95, 42, 0.28);
  transform: rotate(-1.5deg);
  top: 50px;
  left: 200px;
}

.hero-trial::after {
  content: none;
}

.trial-price {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  min-width: 0;
  padding: 4px 10px;
  border-radius: 999px;
  color: #fff;
  background: rgba(255, 255, 255, 0.18);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.trial-price span,
.trial-price strong,
.trial-copy b,
.hero-trial a {
  display: block;
}

.trial-price span {
  font-weight: 900;
  font-size: 13px;
  letter-spacing: 0.08em;
}

.trial-price strong {
  margin-top: 0;
  font-family: var(--display);
  font-size: 28px;
  line-height: 1;
  font-weight: 900;
}

.trial-price small {
  margin-right: 1px;
  font-family: var(--sans);
  font-size: 14px;
}

.trial-copy {
  position: relative;
  z-index: 1;
  color: #fff;
}

.trial-copy b {
  font-size: 16px;
  font-weight: 900;
  text-shadow: 0 2px 8px rgba(130, 50, 0, 0.22);
}

.trial-copy p {
  display: none;
}

.hero-trial a {
  position: relative;
  z-index: 1;
  padding: 8px 13px;
  border-radius: 999px;
  color: #ff6429;
  background: #fff;
  box-shadow: 0 12px 24px rgba(130, 50, 0, 0.16);
  font-weight: 900;
  white-space: nowrap;
}

.button {
  padding: 14px 22px;
  border: 2px solid transparent;
  transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
}

.button:hover,
.button:focus-visible,
.nav-cta:hover,
.nav-cta:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, #ff6f2e, #ffb12d);
  box-shadow: 0 18px 36px rgba(255, 122, 47, 0.3);
}

.button-ghost {
  color: var(--blue-deep);
  border-color: rgba(7, 95, 210, 0.2);
  background: rgba(255, 255, 255, 0.66);
  backdrop-filter: blur(10px);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 620px;
  margin: 34px 0 0;
}

.hero-metrics div {
  padding: 17px 16px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: 0 16px 40px rgba(8, 49, 111, 0.12);
  backdrop-filter: blur(16px);
}

.hero-metrics dt {
  color: var(--blue-deep);
  font-family: var(--display);
  font-size: 40px;
  line-height: 1;
  font-weight: 900;
}

.hero-metrics dd {
  margin: 7px 0 0;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 800;
}

.hero-stage {
  position: relative;
  min-height: 640px;
}

.student-art {
  position: absolute;
  z-index: 2;
  right: -42px;
  bottom: 74px;
  width: min(370px, 72vw);
  filter: drop-shadow(0 28px 32px rgba(8, 49, 111, 0.24));
  animation: floatKid 5.8s ease-in-out infinite;
}

.poster-ribbon {
  position: absolute;
  z-index: 5;
  right: 230px;
  top: 88px;
  transform: rotate(-3deg);
  padding: 12px 22px;
  color: #fff;
  border-radius: 999px;
  background: linear-gradient(90deg, #2b84ff, #6cbbff);
  box-shadow: 0 16px 30px rgba(7, 95, 210, 0.24);
  font-weight: 900;
  white-space: nowrap;
}

.quick-board {
  position: absolute;
  z-index: 4;
  left: 0;
  right: 120px;
  bottom: 28px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 18px;
  border: 2px solid rgba(255, 255, 255, 0.7);
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-blue);
  backdrop-filter: blur(18px);
}

.quick-board article {
  min-height: 116px;
  padding: 18px 16px;
  border-radius: 22px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(235, 247, 255, 0.72)),
    radial-gradient(circle at top right, rgba(255, 200, 61, 0.22), transparent 7rem);
}

.quick-board span {
  display: inline-flex;
  width: 52px;
  height: 52px;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  border-radius: 16px;
  color: #fff;
  background: linear-gradient(135deg, #38b7ff, #1b6eef);
  font-weight: 900;
}

.quick-board strong {
  display: block;
  color: #173b72;
  font-size: 15px;
  line-height: 1.5;
}

.sun-orbit {
  position: absolute;
  z-index: 1;
  top: 38px;
  right: clamp(18px, 7vw, 118px);
  width: 190px;
  height: 190px;
  border-radius: 50%;
  background: repeating-conic-gradient(from 0deg, rgba(255, 255, 255, 0.46) 0 7deg, transparent 7deg 15deg);
  opacity: 0.78;
  animation: spin 28s linear infinite;
}

.cloud {
  position: absolute;
  z-index: 1;
  width: 210px;
  height: 70px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  filter: blur(0.2px);
  box-shadow: 46px 12px 0 rgba(255, 255, 255, 0.72), -34px 18px 0 rgba(255, 255, 255, 0.68);
}

.cloud::before,
.cloud::after {
  content: "";
  position: absolute;
  bottom: 22px;
  border-radius: 50%;
  background: inherit;
}

.cloud::before {
  left: 26px;
  width: 86px;
  height: 86px;
}

.cloud::after {
  right: 35px;
  width: 112px;
  height: 112px;
}

.cloud-a {
  left: 3vw;
  top: 210px;
  animation: drift 18s ease-in-out infinite;
}

.cloud-b {
  right: 13vw;
  bottom: 180px;
  transform: scale(0.72);
  animation: drift 22s ease-in-out infinite reverse;
}

.paper-plane {
  position: absolute;
  z-index: 2;
  width: 0;
  height: 0;
  border-top: 16px solid transparent;
  border-bottom: 16px solid transparent;
  border-left: 48px solid rgba(255, 255, 255, 0.86);
  filter: drop-shadow(0 8px 14px rgba(8, 49, 111, 0.16));
}

.paper-plane::after {
  content: "";
  position: absolute;
  top: -8px;
  left: -45px;
  width: 42px;
  height: 2px;
  border-radius: 999px;
  background: rgba(7, 95, 210, 0.24);
}

.plane-a {
  left: 54%;
  top: 54%;
  transform: rotate(18deg);
  animation: plane 9s ease-in-out infinite;
}

.plane-b {
  left: 18%;
  bottom: 130px;
  transform: rotate(-8deg) scale(0.72);
  animation: plane 11s ease-in-out infinite reverse;
}

.grassline {
  position: absolute;
  z-index: 3;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 92px;
  background:
    radial-gradient(ellipse at 18% 85%, #50c66a 0 22%, transparent 23%),
    radial-gradient(ellipse at 46% 100%, #7bd448 0 28%, transparent 29%),
    radial-gradient(ellipse at 78% 96%, #3fbd65 0 28%, transparent 29%),
    linear-gradient(180deg, transparent, #81d657 48%, #55bd4a);
}

.section {
  position: relative;
  width: min(calc(100% - 36px), var(--max));
  margin: 0 auto;
  padding: clamp(70px, 9vw, 120px) 0;
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 86px;
  padding-top: 34px;
  padding-bottom: 34px !important;
}

.proof-item {
  padding: 26px 28px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.84);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(14px);
}

.proof-item span {
  display: block;
  color: var(--orange);
  font-family: var(--display);
  font-size: 34px;
  font-weight: 900;
}

.proof-item strong {
  display: block;
  margin-top: 4px;
  font-size: 22px;
}

.proof-item p {
  margin: 10px 0 0;
  color: var(--ink-soft);
  line-height: 1.72;
}

.section-heading {
  max-width: 820px;
}

.section-heading h2,
.course-copy h2,
.parents-copy h2,
.final-copy h2 {
  margin: 0;
  color: #0c3b7f;
  font-family: var(--display);
  font-size: clamp(34px, 5vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.section-heading p,
.course-copy p,
.parents-copy p {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.85;
  font-weight: 650;
}

.ability-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 42px;
}

.ability-card {
  position: relative;
  min-height: 270px;
  padding: 24px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(239, 249, 255, 0.78)),
    radial-gradient(circle at 100% 0%, rgba(101, 215, 255, 0.24), transparent 11rem);
  box-shadow: 0 16px 40px rgba(8, 49, 111, 0.1);
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}

.ability-card:hover {
  transform: translateY(-6px) rotate(-0.5deg);
  box-shadow: 0 24px 54px rgba(8, 49, 111, 0.17);
}

.ability-card.spotlight {
  color: #fff;
  background:
    radial-gradient(circle at 92% 12%, rgba(255, 200, 61, 0.36), transparent 12rem),
    linear-gradient(135deg, #1268d8, #0b3f91);
}

.ability-card:nth-child(5) {
  grid-column: span 2;
}

.ability-icon {
  display: inline-flex;
  min-width: 58px;
  height: 58px;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  border-radius: 19px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #40c6ff);
  font-family: var(--display);
  font-size: 24px;
  font-weight: 900;
  box-shadow: 0 16px 26px rgba(22, 137, 255, 0.22);
}

.ability-card.spotlight .ability-icon {
  color: #0b3f91;
  background: linear-gradient(135deg, #fff, #fff1a7);
}

.ability-card small {
  position: absolute;
  top: 28px;
  right: 24px;
  color: var(--orange);
  font-weight: 900;
}

.ability-card.spotlight small,
.ability-card.spotlight p {
  color: rgba(255, 255, 255, 0.82);
}

.ability-card h3 {
  margin: 26px 0 0;
  font-size: 25px;
}

.ability-card p {
  margin: 12px 0 0;
  color: var(--ink-soft);
  line-height: 1.74;
}

.question-bank {
  padding-top: 40px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(360px, 1fr);
  gap: clamp(28px, 6vw, 76px);
  align-items: center;
}

.text-link {
  display: inline-flex;
  margin-top: 26px;
  color: var(--blue-deep);
  font-weight: 900;
}

.topic-panel {
  position: relative;
  padding: 26px;
  border-radius: var(--radius-xl);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(224, 246, 255, 0.72)),
    radial-gradient(circle at top left, rgba(255, 200, 61, 0.18), transparent 12rem);
  box-shadow: var(--shadow-blue);
}

.topic-panel::before {
  content: "58";
  position: absolute;
  top: -42px;
  right: 30px;
  color: rgba(255, 122, 47, 0.18);
  font-family: var(--display);
  font-size: 124px;
  font-weight: 900;
}

.topic-row {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 142px 1fr;
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px dashed rgba(8, 49, 111, 0.18);
}

.topic-row:last-child {
  border-bottom: 0;
}

.topic-row strong {
  color: #0c3b7f;
  font-size: 20px;
}

.topic-row span {
  color: var(--ink-soft);
  line-height: 1.65;
}

.course {
  width: min(calc(100% - 36px), 1240px);
}

.course-shell {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.78fr);
  gap: clamp(28px, 5vw, 62px);
  align-items: center;
  padding: clamp(32px, 6vw, 74px);
  overflow: hidden;
  border-radius: 42px;
  background:
    radial-gradient(circle at 12% 18%, rgba(255, 255, 255, 0.86), transparent 14rem),
    radial-gradient(circle at 86% 30%, rgba(255, 200, 61, 0.34), transparent 16rem),
    linear-gradient(135deg, #ddffd7, #f8ffe0 46%, #fff6cf);
  box-shadow: 0 30px 80px rgba(63, 189, 101, 0.18);
}

.course-shell::after {
  content: "";
  position: absolute;
  right: -90px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: rgba(63, 189, 101, 0.22);
}

.badge {
  position: absolute;
  top: 28px;
  right: 34px;
  z-index: 1;
  padding: 10px 16px;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(135deg, #ff6f2e, #ffb12d);
  box-shadow: 0 12px 24px rgba(255, 122, 47, 0.24);
  font-weight: 900;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 32px;
  color: #1c5f3a;
  font-weight: 850;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: -1px;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: #fff;
  background: var(--green);
  font-size: 14px;
}

.lesson-player {
  position: relative;
  z-index: 1;
  padding: 18px;
  border: 10px solid rgba(255, 255, 255, 0.62);
  border-radius: 32px;
  background: linear-gradient(145deg, #163d72, #0a244b);
  box-shadow: 0 28px 56px rgba(8, 49, 111, 0.28);
}

.player-screen {
  min-height: 242px;
  display: grid;
  grid-template-columns: 92px 1fr 58px;
  gap: 18px;
  align-items: center;
  padding: 26px;
  border-radius: 24px;
  color: #fff;
  background:
    radial-gradient(circle at 78% 22%, rgba(101, 215, 255, 0.26), transparent 9rem),
    linear-gradient(160deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.02));
}

.teacher-avatar {
  width: 92px;
  height: 92px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 38%, #ffd5bc 0 25%, transparent 26%),
    radial-gradient(circle at 42% 28%, #253856 0 18%, transparent 19%),
    linear-gradient(180deg, #62b5ff 0 48%, #2f75d6 49% 100%);
  box-shadow: inset 0 -12px 0 rgba(0, 0, 0, 0.08);
}

.player-screen strong,
.player-screen span {
  display: block;
}

.player-screen strong {
  font-size: 24px;
}

.player-screen span {
  margin-top: 9px;
  color: rgba(255, 255, 255, 0.72);
}

.player-screen button {
  width: 58px;
  height: 58px;
  border: 0;
  border-radius: 50%;
  color: #0a244b;
  background: #fff;
  cursor: pointer;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.22);
}

.progress {
  height: 9px;
  margin: 16px 12px 0;
  overflow: hidden;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.16);
}

.progress span {
  display: block;
  width: 58%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--gold), var(--orange));
}

.exam-layout {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 40px;
}

.exam-feature {
  min-height: 300px;
  padding: 30px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(246, 253, 255, 0.76)),
    radial-gradient(circle at 88% 10%, rgba(255, 200, 61, 0.2), transparent 8rem);
  box-shadow: 0 18px 46px rgba(8, 49, 111, 0.12);
}

.exam-feature span {
  display: inline-flex;
  width: 62px;
  height: 62px;
  align-items: center;
  justify-content: center;
  border-radius: 22px;
  color: #fff;
  background: linear-gradient(135deg, #ff8d3e, #ffc83d);
  font-weight: 900;
}

.exam-feature h3 {
  margin: 28px 0 0;
  font-size: 27px;
}

.exam-feature p {
  margin: 14px 0 0;
  color: var(--ink-soft);
  line-height: 1.78;
}

.parents {
  display: grid;
  grid-template-columns: minmax(360px, 0.85fr) minmax(0, 1fr);
  gap: clamp(34px, 7vw, 86px);
  align-items: center;
}

.phone-stack {
  position: relative;
  min-height: 500px;
}

.phone {
  position: absolute;
  width: 250px;
  min-height: 430px;
  padding: 34px 22px;
  border: 10px solid #103a76;
  border-radius: 38px;
  background: linear-gradient(180deg, #f5fcff, #dff4ff);
  box-shadow: 0 28px 60px rgba(8, 49, 111, 0.22);
}

.phone::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 12px;
  width: 74px;
  height: 7px;
  border-radius: 99px;
  background: #103a76;
  transform: translateX(-50%);
}

.phone span {
  display: block;
  width: 62px;
  height: 62px;
  border-radius: 20px;
  background: linear-gradient(135deg, #1689ff, #65d7ff);
}

.phone strong {
  display: block;
  margin-top: 24px;
  font-size: 24px;
}

.phone p {
  margin: 14px 0 0;
  color: var(--ink-soft);
  font-weight: 750;
}

.phone-a {
  left: 28px;
  top: 14px;
  transform: rotate(-7deg);
}

.phone-b {
  right: 28px;
  bottom: 10px;
  transform: rotate(8deg);
  background: linear-gradient(180deg, #fffaf1, #e9ffd8);
}

.radar {
  width: 150px;
  height: 150px;
  margin: 34px auto 18px;
  clip-path: polygon(50% 4%, 92% 28%, 82% 82%, 50% 98%, 17% 80%, 8% 28%);
  background:
    radial-gradient(circle, rgba(255, 255, 255, 0.75) 0 24%, transparent 25%),
    conic-gradient(from 18deg, #1689ff, #3fbd65, #ffc83d, #ff7a2f, #1689ff);
  opacity: 0.9;
}

.parent-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.parent-tags span {
  padding: 11px 15px;
  border: 1px solid rgba(7, 95, 210, 0.16);
  border-radius: 999px;
  color: #0b4fae;
  background: rgba(255, 255, 255, 0.72);
  font-weight: 850;
}

.pricing {
  width: min(calc(100% - 36px), 1240px);
  padding-top: 46px;
}

.pricing-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
}

.pricing-head h2 {
  max-width: 780px;
  margin: 0;
  color: #0c3b7f;
  font-family: var(--display);
  font-size: clamp(34px, 5vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.pricing-head p {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.85;
  font-weight: 650;
}

.pricing-grid {
  display: grid;
  grid-template-columns: minmax(280px, 1.28fr) repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 38px;
}

.price-card {
  position: relative;
  min-height: 280px;
  padding: 24px;
  overflow: hidden;
  border: 3px solid rgba(255, 255, 255, 0.84);
  border-radius: 28px;
  background:
    radial-gradient(circle at 90% 0%, rgba(255, 201, 40, 0.22), transparent 10rem),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(225, 246, 255, 0.9));
  box-shadow: 0 18px 42px rgba(0, 86, 194, 0.15);
}

.price-card h3 {
  margin: 0;
  color: #074aa8;
  font-size: 24px;
}

.price-value {
  margin: 18px 0 0;
  color: #0057c8;
  font-family: var(--display);
  font-size: 48px;
  line-height: 1;
  font-weight: 900;
}

.price-value small {
  margin-right: 3px;
  font-family: var(--sans);
  font-size: 22px;
}

.price-note {
  margin: 16px 0 0;
  color: var(--ink-soft);
  line-height: 1.72;
  font-weight: 750;
}

.trial-card {
  min-height: 340px;
  color: #fff;
  background:
    radial-gradient(circle at 80% 10%, rgba(255, 255, 255, 0.42), transparent 9rem),
    linear-gradient(135deg, #ff5f2a, #ffae2d 54%, #ffdf56);
  box-shadow: 0 26px 58px rgba(255, 95, 42, 0.32);
}

.trial-card::after {
  content: "9.9";
  position: absolute;
  right: -18px;
  bottom: -34px;
  color: rgba(255, 255, 255, 0.22);
  font-family: var(--display);
  font-size: 128px;
  font-weight: 900;
}

.trial-card h3,
.trial-card .price-value,
.trial-card .price-note {
  color: #fff;
}

.trial-card ul {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.trial-card li {
  color: rgba(255, 255, 255, 0.94);
  font-weight: 850;
}

.trial-card li::before {
  content: "✓";
  margin-right: 8px;
}

.price-badge {
  width: fit-content;
  margin-bottom: 18px;
  padding: 7px 12px;
  border-radius: 999px;
  color: #ff682d;
  background: #fff;
  font-weight: 900;
}

.trial-card a {
  position: relative;
  z-index: 1;
  display: inline-flex;
  margin-top: 24px;
  padding: 12px 18px;
  border-radius: 999px;
  color: #0057c8;
  background: #fff;
  font-weight: 900;
}

.faq {
  padding-top: 44px;
}

.faq-list {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.faq-list details {
  border: 1px solid rgba(8, 49, 111, 0.12);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 12px 34px rgba(8, 49, 111, 0.08);
}

.faq-list summary {
  padding: 22px 26px;
  cursor: pointer;
  color: #0c3b7f;
  font-size: 20px;
  font-weight: 900;
}

.faq-list p {
  margin: 0;
  padding: 0 26px 24px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.final-cta {
  position: relative;
  margin-top: 40px;
  padding: clamp(76px, 12vw, 140px) clamp(18px, 4vw, 44px);
  overflow: hidden;
  text-align: center;
  background:
    radial-gradient(circle at 22% 22%, rgba(255, 255, 255, 0.72), transparent 18rem),
    radial-gradient(circle at 78% 16%, rgba(255, 200, 61, 0.34), transparent 18rem),
    linear-gradient(135deg, #1388ff, #64d9ff 48%, #dfffce);
}

.final-cta::before {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 110px;
  background:
    radial-gradient(ellipse at 22% 100%, #47c55f 0 24%, transparent 25%),
    radial-gradient(ellipse at 58% 100%, #86d754 0 28%, transparent 29%),
    radial-gradient(ellipse at 84% 100%, #40b85e 0 26%, transparent 27%);
}

.final-copy {
  position: relative;
  z-index: 1;
  width: min(880px, 100%);
  margin: 0 auto;
}

.final-copy p {
  margin: 0 0 14px;
  color: rgba(255, 255, 255, 0.92);
  font-weight: 900;
  letter-spacing: 0.08em;
}

.final-copy h2 {
  color: #fff;
  text-shadow: 0 10px 28px rgba(8, 49, 111, 0.22);
}

.final-copy .button {
  margin-top: 30px;
}

.site-footer {
  display: flex;
  width: min(calc(100% - 36px), var(--max));
  margin: 0 auto;
  padding: 30px 0 42px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: rgba(8, 49, 111, 0.7);
}

.site-footer strong,
.site-footer span {
  display: block;
}

.site-footer strong {
  color: var(--ink);
  font-size: 20px;
}

.site-footer p {
  margin: 0;
}

.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.64s ease, transform 0.64s ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.js .hero .reveal {
  opacity: 1;
  transform: none;
  transition: none;
}

.hero-copy {
  animation: heroCopyIn 0.72s ease both;
}

.hero-stage {
  animation: heroStageIn 0.82s 0.1s ease both;
}

.js .ability-card:nth-child(2),
.js .exam-feature:nth-child(2),
.js .proof-item:nth-child(2) {
  transition-delay: 0.08s;
}

.js .ability-card:nth-child(3),
.js .exam-feature:nth-child(3),
.js .proof-item:nth-child(3) {
  transition-delay: 0.16s;
}

.js .ability-card:nth-child(4) {
  transition-delay: 0.24s;
}

@keyframes floatKid {
  0%,
  100% {
    transform: translate3d(0, 0, 0) rotate(0deg);
  }
  50% {
    transform: translate3d(0, -14px, 0) rotate(1.2deg);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes drift {
  0%,
  100% {
    transform: translateX(0);
  }
  50% {
    transform: translateX(24px);
  }
}

@keyframes plane {
  0%,
  100% {
    translate: 0 0;
  }
  50% {
    translate: 22px -18px;
  }
}

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

@keyframes heroStageIn {
  from {
    opacity: 1;
    transform: translateX(22px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@media (max-width: 980px) {
  .site-header {
    padding: 12px 18px;
  }

  .nav-links {
    display: none;
  }

  .hero {
    padding-top: 96px;
  }

  .hero-inner,
  .split,
  .course-shell,
  .parents {
    grid-template-columns: 1fr;
  }

  .hero-stage {
    min-height: 570px;
  }

  .student-art {
    right: 0;
    bottom: 72px;
    width: min(340px, 72vw);
  }

  .poster-ribbon {
    left: 0;
    right: auto;
    top: 28px;
  }

  .quick-board {
    right: 18%;
  }

  .proof-strip,
  .exam-layout {
    grid-template-columns: 1fr;
  }

  .ability-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ability-card:nth-child(5),
  .ability-card:nth-child(7) {
    grid-column: span 1;
  }

  .phone-stack {
    min-height: 560px;
  }
}

@media (max-width: 680px) {
  .brand span {
    font-size: 18px;
  }

  .nav-cta {
    min-height: 40px;
    padding: 8px 14px;
    font-size: 14px;
  }

  .hero {
    min-height: auto;
    padding-bottom: 90px;
  }

  .hero h1 {
    font-size: clamp(48px, 17vw, 72px);
  }

  .hero-metrics,
  .quick-board,
  .ability-grid {
    grid-template-columns: 1fr;
  }

  .hero-stage {
    min-height: 540px;
  }

  .poster-ribbon {
    top: 16px;
    font-size: 13px;
  }

  .quick-board {
    left: 0;
    right: 0;
    bottom: 0;
    padding: 14px;
  }

  .quick-board article {
    min-height: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 13px;
  }

  .quick-board span {
    flex: 0 0 auto;
    width: 42px;
    height: 42px;
    margin: 0;
    border-radius: 14px;
  }

  .proof-strip {
    width: min(calc(100% - 28px), var(--max));
  }

  .section {
    width: min(calc(100% - 28px), var(--max));
    padding: 72px 0;
  }

  .section-heading h2,
  .course-copy h2,
  .parents-copy h2,
  .final-copy h2 {
    font-size: clamp(32px, 10.5vw, 46px);
  }

  .topic-row {
    grid-template-columns: 1fr;
  }

  .course-shell {
    width: min(calc(100% - 28px), 1240px);
    margin: 0 auto;
    padding: 70px 22px 28px;
    border-radius: 30px;
  }

  .badge {
    top: 22px;
    right: 22px;
  }

  .player-screen {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .teacher-avatar,
  .player-screen button {
    margin: 0 auto;
  }

  .phone-stack {
    min-height: 500px;
  }

  .phone {
    width: 218px;
    min-height: 380px;
  }

  .phone-a {
    left: 0;
  }

  .phone-b {
    right: 0;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* Vivid campaign refresh: keep the original layout, use the poster's palette. */
:root {
  --ink: #063074;
  --ink-soft: #164a8e;
  --blue: #087fff;
  --blue-deep: #014fbc;
  --cyan: #43c8ff;
  --orange: #ff5f2a;
  --gold: #ffc928;
  --green: #45c853;
  --mint: #e9ffd8;
}

body {
  background:
    radial-gradient(circle at 84% 0%, rgba(255, 238, 118, 0.72), transparent 22rem),
    linear-gradient(180deg, #8bd7ff 0%, #d7f5ff 38%, #eaffcf 71%, #fff6d8 100%);
}

.site-header.is-scrolled {
  background: rgba(161, 222, 255, 0.82);
}

.hero {
  min-height: 100svh;
  background:
    radial-gradient(circle at 84% 10%, #fff 0 3.3rem, rgba(255, 232, 96, 0.88) 3.5rem, transparent 13rem),
    radial-gradient(circle at 10% 30%, rgba(255, 255, 255, 0.88), transparent 14rem),
    linear-gradient(145deg, #9de2ff 0%, #58b8ff 45%, #dfffe7 100%);
}

.hero::before {
  z-index: 0;
  background:
    linear-gradient(105deg, transparent 0 51%, rgba(255, 255, 255, 0.55) 51% 52%, transparent 52%),
    linear-gradient(115deg, transparent 0 68%, rgba(255, 255, 255, 0.36) 68% 69%, transparent 69%),
    radial-gradient(circle at 78% 6%, rgba(255, 255, 255, 0.68), transparent 14rem);
}

.hero::after {
  content: none;
}

.hero h1 {
  color: #004fc4;
  text-shadow:
    0 5px 0 #fff,
    0 10px 0 rgba(255, 255, 255, 0.78),
    0 18px 28px rgba(0, 70, 170, 0.28);
}

.hero h1 span {
  color: var(--orange);
  text-shadow:
    0 5px 0 #fff,
    0 10px 0 rgba(255, 255, 255, 0.78),
    0 18px 28px rgba(255, 95, 42, 0.28);
}

.hero-lead {
  color: #063f87;
  font-weight: 900;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.74);
}

.eyebrow,
.section-kicker {
  background: linear-gradient(90deg, #086fe8, #25a9ff);
}

.button-primary,
.nav-cta {
  background: linear-gradient(135deg, #ff5f2a, #ffae2d);
  box-shadow: 0 16px 30px rgba(255, 95, 42, 0.38);
}

.button-ghost {
  color: #0061d5;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 12px 26px rgba(0, 89, 203, 0.13);
}

.hero-metrics div {
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 18px 34px rgba(0, 89, 203, 0.16);
}

.poster-ribbon {
  background: linear-gradient(90deg, #086fe8, #2fb7ff);
  border: 3px solid rgba(255, 255, 255, 0.78);
  box-shadow: 0 18px 34px rgba(0, 86, 194, 0.25);
}

.quick-board {
  border: 4px solid rgba(255, 255, 255, 0.86);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 30px 64px rgba(0, 86, 194, 0.22);
}

.quick-board article {
  background:
    radial-gradient(circle at top right, rgba(255, 201, 40, 0.3), transparent 7rem),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(223, 244, 255, 0.86));
}

.quick-board span {
  background: linear-gradient(135deg, #0a82ff, #1ec4ff);
}

.proof-item,
.ability-card,
.exam-feature,
.faq-list details {
  border: 3px solid rgba(255, 255, 255, 0.84);
  background:
    radial-gradient(circle at 86% 0%, rgba(255, 201, 40, 0.22), transparent 10rem),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(225, 246, 255, 0.9));
  box-shadow: 0 18px 42px rgba(0, 86, 194, 0.15);
}

.ability-card.spotlight {
  background:
    radial-gradient(circle at 88% 12%, rgba(255, 201, 40, 0.42), transparent 12rem),
    linear-gradient(135deg, #0066d8, #003e9a);
}

.course-shell {
  border: 5px solid rgba(255, 255, 255, 0.78);
  background:
    radial-gradient(circle at 80% 14%, rgba(255, 228, 90, 0.56), transparent 16rem),
    linear-gradient(135deg, #e4ffd4 0%, #fbffe2 50%, #fff2bd 100%);
}

.lesson-player {
  border-color: rgba(255, 255, 255, 0.88);
  background: linear-gradient(145deg, #0a58c2, #062c73);
}

.player-screen {
  background: rgba(4, 39, 85, 0.68);
  backdrop-filter: blur(3px);
}

.final-cta {
  background:
    radial-gradient(circle at 50% 10%, rgba(255, 255, 255, 0.36), transparent 18rem),
    radial-gradient(circle at 75% 16%, rgba(255, 201, 40, 0.34), transparent 18rem),
    linear-gradient(135deg, #0a83ff, #63d7ff 48%, #dfffce);
}

@media (max-width: 980px) {
  .hero-stage {
    min-height: 610px;
  }

  .hero-trial,
  .pricing-head {
    align-items: center;
  }

  .hero-trial {
    display: inline-flex;
  }

  .hero-trial a {
    width: fit-content;
  }

  .pricing-head {
    flex-direction: column;
  }

  .pricing-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .trial-card {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .hero {
    position: relative;
    padding-top: 92px;
    padding-bottom: 90px;
    background:
      radial-gradient(circle at 82% 8%, #fff 0 3rem, rgba(255, 232, 96, 0.84) 3.2rem, transparent 10rem),
      linear-gradient(145deg, #9fe4ff 0%, #59baff 50%, #e3ffd4 100%);
  }

  .hero::after {
    content: none;
  }

  .hero-inner {
    display: block;
    min-height: 0;
  }

  .hero-copy {
    position: relative;
    z-index: 3;
  }

  .hero-stage {
    position: absolute;
    z-index: 1;
    top: 150px;
    right: -28px;
    width: 180px;
    height: 242px;
    min-height: 0;
    pointer-events: none;
  }

  .student-art {
    top: 0;
    right: 10px;
    bottom: auto;
  }

  .hero-stage .quick-board,
  .hero-stage .poster-ribbon {
    display: none;
  }

  .hero h1 {
    max-width: 286px;
  }

  .hero-lead {
    max-width: 310px;
    margin-top: 16px;
    font-size: 16px;
    line-height: 1.68;
  }

  .hero-actions {
    margin-top: 20px;
  }

  .hero-trial {
    position: static;
    top: auto;
    left: auto;
    transform: none;
    gap: 8px;
    max-width: 100%;
    margin-top: 16px;
    padding: 9px 10px;
    border-radius: 999px;
  }

  .trial-price {
    width: fit-content;
  }

  .trial-copy b {
    font-size: 15px;
  }

  .pricing {
    width: min(calc(100% - 28px), 1240px);
  }

  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .pricing-head h2 {
    font-size: clamp(32px, 10.5vw, 46px);
  }

  .price-card,
  .trial-card {
    min-height: auto;
  }
}

.js .reveal,
.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Keep the character visually behind the right-side cards. */
.hero-stage {
  isolation: isolate;
}

.student-art {
  z-index: 0 !important;
}

.quick-board {
  z-index: 100 !important;
  right: 34px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(18px);
}

.quick-board article {
  background:
    radial-gradient(circle at top right, rgba(255, 201, 40, 0.3), transparent 7rem),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(223, 244, 255, 0.86));
}

.poster-ribbon {
  z-index: 110 !important;
  right: 360px;
}

@media (max-width: 980px) {
  .quick-board {
    right: 18px;
  }
}

@media (max-width: 680px) {
  .quick-board {
    right: 0;
  }
}