:root {
  --bg: #f6f1ea;
  --bg-pattern: #fbf7f2;
  --panel: rgba(255, 253, 250, 0.82);
  --panel-border: #e9dfd3;
  --ink: #443d35;
  --ink-strong: #141b2d;
  --muted: #7c7974;
  --button: #d36f3d;
  --button-dark: #1f2a3d;
  --button-light: #ea9569;
  --line: #ebe2d7;
  --surface: #fffdfa;
  --surface-soft: rgba(255, 253, 250, 0.92);
  --surface-glass: rgba(255, 252, 248, 0.72);
  --shadow-soft: 0 12px 28px rgba(77, 54, 34, 0.08);
  --shadow-panel: 0 22px 52px rgba(77, 54, 34, 0.1);
  --card-radius: 28px;
  --card-border: rgba(229, 220, 211, 0.96);
  --body-font: "Avenir Next", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  --max-width: 1220px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.92), transparent 25%),
    radial-gradient(circle at 85% 12%, rgba(232, 154, 108, 0.18), transparent 18%),
    radial-gradient(circle at 50% 50%, rgba(255, 245, 236, 0.82), transparent 36%),
    linear-gradient(180deg, var(--bg-pattern) 0%, var(--bg) 100%);
  color: var(--ink);
  font-family: var(--body-font);
}

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

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

button,
a.button {
  font: inherit;
}

.landing-shell {
  position: relative;
  overflow: clip;
}

.landing-shell::before,
.landing-shell::after {
  content: "";
  position: fixed;
  inset: auto;
  width: 32rem;
  height: 32rem;
  border-radius: 999px;
  filter: blur(70px);
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
}

.landing-shell::before {
  top: -10rem;
  right: -10rem;
  background: rgba(231, 150, 90, 0.18);
}

.landing-shell::after {
  left: -12rem;
  bottom: 12rem;
  background: rgba(20, 27, 45, 0.08);
}

.site-header,
.hero,
.skills-section,
.proof-section,
.pricing-section,
.steps-section,
.faq-section,
.final-cta,
.site-footer {
  position: relative;
  z-index: 1;
}

.site-header,
.skills-section,
.proof-section,
.pricing-section,
.steps-section,
.faq-section,
.final-cta,
.site-footer {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  padding: 6px;
  border: 1px solid var(--card-border);
  border-radius: 18px;
  background: rgba(255, 252, 248, 0.86);
  box-shadow: var(--shadow-soft);
}

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

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-copy strong {
  color: var(--ink-strong);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

.brand-copy span {
  color: var(--muted);
  font-size: 0.9rem;
}

.site-nav,
.site-actions,
.hero-actions,
.pricing-list,
.site-footer nav {
  display: flex;
  align-items: center;
}

.site-nav {
  gap: 26px;
  color: rgba(20, 27, 45, 0.8);
  font-size: 0.98rem;
}

.site-nav a {
  position: relative;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 1px;
  transform: scaleX(0);
  transform-origin: left;
  background: rgba(211, 111, 61, 0.5);
  transition: transform 160ms ease;
}

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

.site-actions {
  gap: 10px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease,
    color 160ms ease,
    border-color 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(135deg, var(--button) 0%, var(--button-light) 100%);
  color: #fff;
  box-shadow: 0 16px 30px rgba(211, 111, 61, 0.2);
}

.button-secondary,
.button-ghost {
  border-color: var(--card-border);
  background: rgba(255, 252, 248, 0.66);
  color: var(--ink-strong);
}

.button-dark {
  background: var(--button-dark);
  color: #fff;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: 42px;
  align-items: center;
  width: min(calc(100% - 32px), 1280px);
  margin: 0 auto;
  padding: 36px 0 64px;
}

.hero-copy {
  padding: 32px 0 24px;
  animation: riseIn 650ms ease both;
}

.eyebrow {
  margin: 0 0 14px;
  color: rgba(20, 27, 45, 0.68);
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1,
.section-head h2,
.final-cta h2 {
  margin: 0;
  color: var(--ink-strong);
  letter-spacing: -0.04em;
}

.hero h1 {
  max-width: 10ch;
  font-size: clamp(3.2rem, 6.2vw, 5.6rem);
  line-height: 0.95;
}

.hero-lead,
.section-copy,
.pricing-copy p,
.pricing-list,
.proof-copy p,
.steps-grid p,
.faq-list p,
.site-footer p {
  color: rgba(68, 61, 53, 0.8);
}

.hero-lead {
  max-width: 36rem;
  margin: 22px 0 0;
  font-size: 1.1rem;
  line-height: 1.75;
}

.hero-actions {
  gap: 12px;
  margin-top: 28px;
}

.hero-visual {
  display: flex;
  justify-content: flex-end;
  animation: riseIn 720ms ease 80ms both;
}

.hero-device {
  position: relative;
  width: min(100%, 580px);
  padding: 18px;
  border: 1px solid var(--card-border);
  border-radius: 36px;
  background: linear-gradient(180deg, rgba(255, 253, 250, 0.94), rgba(247, 240, 233, 0.8));
  box-shadow: var(--shadow-panel);
}

.hero-device::before {
  content: "";
  position: absolute;
  inset: 18px 18px auto;
  height: 42px;
  border-radius: 20px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.96), rgba(244, 228, 213, 0.78));
  z-index: 0;
}

.hero-device img {
  position: relative;
  z-index: 1;
  width: 100%;
  border-radius: 24px;
}

.skills-section,
.proof-section,
.guides-section,
.pricing-section,
.steps-section,
.faq-section {
  padding: 92px 0 0;
}

.section-head {
  max-width: 46rem;
}

.section-head h2,
.final-cta h2 {
  font-size: clamp(2rem, 3.4vw, 3.3rem);
  line-height: 1;
}

.section-copy {
  max-width: 40rem;
  margin: 18px 0 0;
  font-size: 1rem;
  line-height: 1.8;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.skill-card,
.proof-card,
.pricing-panel,
.steps-grid article {
  border: 1px solid var(--card-border);
  background: rgba(255, 252, 248, 0.78);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(14px);
}

.skill-card {
  min-height: 260px;
  padding: 24px;
  border-radius: 28px;
}

.skill-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.skill-listening .skill-icon { background: #cd7441; }
.skill-reading .skill-icon { background: #365d8b; }
.skill-writing .skill-icon { background: #7c5636; }
.skill-speaking .skill-icon { background: #3f846b; }

.skill-card h3,
.proof-copy h3,
.steps-grid h3 {
  margin: 24px 0 10px;
  color: var(--ink-strong);
  font-size: 1.32rem;
}

.skill-card p,
.proof-copy p,
.steps-grid p,
.pricing-list li,
.pricing-panel p,
.faq-list p {
  margin: 0;
  line-height: 1.72;
}

.proof-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) repeat(2, minmax(0, 0.9fr));
  gap: 14px;
  margin-top: 26px;
}

.guides-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.guide-card {
  display: grid;
  gap: 14px;
  min-height: 238px;
  padding: 24px;
  border: 1px solid var(--card-border);
  border-radius: 28px;
  background: rgba(255, 252, 248, 0.78);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(14px);
}

.guide-card__eyebrow {
  color: rgba(20, 27, 45, 0.44);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.guide-card h3 {
  margin: 0;
  color: var(--ink-strong);
  font-size: 1.2rem;
  line-height: 1.15;
}

.guide-card p {
  margin: 0;
  color: rgba(68, 61, 53, 0.8);
  line-height: 1.72;
}

.guide-card__link {
  margin-top: auto;
  color: #9b5a33;
  font-weight: 600;
}

.proof-card {
  overflow: hidden;
  border-radius: 32px;
  min-height: 170px;
  display: flex;
  align-items: flex-end;
}

.proof-media {
  padding: 18px 18px 0;
}

.proof-media img {
  width: 100%;
  border-radius: 22px;
}

.proof-copy {
  padding: 18px 18px 18px;
}

.proof-wide .proof-copy {
  max-width: 26rem;
}

.proof-copy h3 {
  margin: 0 0 8px;
  font-size: 1.16rem;
}

.pricing-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 22px;
  align-items: start;
  margin-top: 34px;
}

.pricing-copy {
  padding: 4px 0;
}

.pricing-copy p {
  max-width: 36rem;
  margin: 0;
  line-height: 1.78;
  font-size: 1.02rem;
}

.pricing-list {
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.pricing-list li {
  position: relative;
  padding-left: 18px;
}

.pricing-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--button);
}

.pricing-panel {
  padding: 28px;
  border-radius: 30px;
  background:
    radial-gradient(circle at top right, rgba(234, 149, 105, 0.18), transparent 28%),
    linear-gradient(180deg, rgba(31, 42, 61, 0.96), rgba(26, 37, 56, 0.96));
  color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 24px 48px rgba(20, 27, 45, 0.22);
}

.pricing-badge {
  display: inline-flex;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.09);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pricing-price {
  margin-top: 18px;
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: -0.06em;
}

.pricing-panel p {
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.76);
}

.pricing-panel .button {
  margin-top: 22px;
  width: 100%;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.steps-grid article {
  min-height: 240px;
  padding: 24px;
  border-radius: 28px;
}

.steps-grid span {
  display: inline-block;
  color: rgba(20, 27, 45, 0.42);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 34px;
}

.faq-list details {
  padding: 22px 24px;
  border: 1px solid var(--card-border);
  border-radius: 22px;
  background: rgba(255, 252, 248, 0.74);
  box-shadow: var(--shadow-soft);
}

.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  color: var(--ink-strong);
  font-weight: 600;
  list-style: none;
}

.faq-list summary::after {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: rgba(243, 235, 226, 0.9);
  color: var(--ink-strong);
  flex: none;
}

.faq-list details[open] summary::after {
  content: "−";
}

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

.faq-list p {
  margin-top: 12px;
}

.final-cta {
  display: grid;
  justify-items: center;
  gap: 16px;
  padding: 92px 0;
  text-align: center;
}

.final-cta .eyebrow {
  margin-bottom: 0;
}

.final-cta h2 {
  max-width: 14ch;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 0 34px;
}

.site-footer p {
  max-width: 38rem;
  margin: 0;
  font-size: 0.95rem;
}

.site-footer nav {
  gap: 18px;
  color: rgba(20, 27, 45, 0.72);
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translate3d(0, 24px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@media (max-width: 1080px) {
  .site-header {
    flex-wrap: wrap;
  }

  .site-nav {
    order: 3;
    width: 100%;
    justify-content: center;
    padding-top: 4px;
  }

  .hero,
  .proof-layout,
  .guides-grid,
  .pricing-layout,
  .steps-grid,
  .skills-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 26px;
  }

  .hero h1 {
    max-width: 12ch;
  }

  .hero-visual {
    justify-content: center;
  }

  .pricing-panel {
    max-width: 420px;
  }
}

@media (max-width: 720px) {
  .site-header,
  .skills-section,
  .proof-section,
  .pricing-section,
  .steps-section,
  .faq-section,
  .final-cta,
  .site-footer {
    width: min(calc(100% - 24px), var(--max-width));
  }

  .site-header {
    gap: 16px;
  }

  .site-nav {
    flex-wrap: wrap;
    gap: 16px 18px;
    justify-content: flex-start;
  }

  .site-actions {
    width: 100%;
  }

  .site-actions .button {
    flex: 1 1 0;
  }

  .hero {
    width: min(calc(100% - 24px), 1280px);
    padding: 18px 0 46px;
  }

  .hero-copy {
    padding-top: 12px;
  }

  .hero h1 {
    max-width: 100%;
    font-size: clamp(2.4rem, 13vw, 3.6rem);
  }

  .hero-lead {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .skills-section,
  .proof-section,
  .guides-section,
  .pricing-section,
  .steps-section,
  .faq-section {
    padding-top: 68px;
  }

  .skill-card,
  .steps-grid article,
  .pricing-panel {
    min-height: auto;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    padding-bottom: 28px;
  }

  .site-footer nav {
    flex-wrap: wrap;
  }
}