:root {
  --bg: #ffffff;
  --surface: #f6f7f9;
  --surface-2: #eceef2;
  --ink: #15171c;
  --ink-soft: #5b6270;
  --ink-mute: #6e7582;
  --line: rgba(21, 23, 28, 0.09);
  --line-strong: rgba(21, 23, 28, 0.18);
  --accent: #b3501d;
  --accent-hover: #9a4316;
  --accent-bright: #e0703a;
  --accent-soft: #fbeee5;
  --tone: var(--accent);
  --tint: var(--accent-soft);
  --shadow-sm: 0 1px 2px rgba(21, 23, 28, 0.04), 0 10px 30px rgba(21, 23, 28, 0.06);
  --shadow: 0 2px 6px rgba(21, 23, 28, 0.04), 0 28px 64px rgba(21, 23, 28, 0.1);
  --radius: 28px;
  --gutter: max(6vw, calc((100vw - 1200px) / 2));
  --check: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 6.2 5 8.6l4.5-5.2' fill='none' stroke='%23b3501d' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  --plus: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M6 1.5v9M1.5 6h9' fill='none' stroke='%2315171c' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");
  --bubble: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 11.5c0 4.1-3.6 7.5-8 7.5-1.1 0-2.2-.2-3.1-.6L4 20l1.3-3.9C4.5 14.8 4 13.2 4 11.5 4 7.4 7.6 4 12 4s8 3.4 8 7.5z'/%3E%3Cpath d='M8.5 11.5h.01M12 11.5h.01M15.5 11.5h.01' stroke-width='2.6'/%3E%3C/svg%3E");
  --chevron: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='m2.5 4.5 3.5 3.5 3.5-3.5' fill='none' stroke='%235b6270' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

[data-lang="en"] { --tone: #2f55c4; --tint: #eaf0ff; }
[data-lang="de"] { --tone: #946000; --tint: #fff3d6; }
[data-lang="es"] { --tone: #a8400e; --tint: #ffece1; }
[data-lang="fr"] { --tone: #6042b8; --tint: #f0ebff; }
[data-lang="it"] { --tone: #1d7a48; --tint: #e3f5ea; }
[data-lang="zh"] { --tone: #bb2740; --tint: #ffe8ec; }

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  font-family: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  font-variant-numeric: lining-nums;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  overflow-x: clip;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3 {
  font-family: "Cormorant Garamond", Georgia, serif;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

h1,
h2 {
  text-wrap: balance;
}

h1 em {
  font-style: italic;
  color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 16px var(--gutter);
  background: rgba(255, 255, 255, 0.84);
  -webkit-backdrop-filter: saturate(1.5) blur(16px);
  backdrop-filter: saturate(1.5) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.nav.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 8px 30px rgba(21, 23, 28, 0.04);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.logo-mark {
  position: relative;
  flex: none;
  width: 24px;
  height: 24px;
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.logo-mark::after {
  content: "";
  position: absolute;
  top: -1.8px;
  left: 13.8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 2.5px var(--logo-bg, #fff);
}

.footer .logo {
  --logo-bg: var(--surface);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
  font-size: 14px;
  font-weight: 600;
}

.nav-links a {
  color: var(--ink-soft);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--ink);
}

.nav-links .nav-cta {
  display: none;
}

.burger {
  display: none;
  place-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  flex-shrink: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
}

.burger span {
  display: block;
  width: 18px;
  height: 1.6px;
  background: var(--ink);
  transition: transform 0.25s;
}

.nav.open .burger span:first-child {
  transform: translateY(3.3px) rotate(45deg);
}

.nav.open .burger span:last-child {
  transform: translateY(-3.3px) rotate(-45deg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font: 700 15px/1 "Manrope", system-ui, sans-serif;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.2s, background-color 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--ink);
  color: #fff;
  box-shadow: 0 10px 24px rgba(21, 23, 28, 0.16);
}

.btn-primary:hover {
  background: #2a2e37;
}

.btn-accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 12px 28px rgba(179, 80, 29, 0.28);
}

.btn-accent:hover {
  background: var(--accent-hover);
}

.btn-ghost {
  background: #fff;
  border-color: var(--line-strong);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--ink);
}

.btn-nav {
  min-height: 42px;
  padding: 0 18px;
  font-size: 14px;
  box-shadow: none;
}

.full {
  width: 100%;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 1.5px;
  background: currentColor;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 64px;
  align-items: center;
  min-height: calc(100vh - 76px);
  padding: 48px var(--gutter) 72px;
}

.hero h1 {
  margin-bottom: 24px;
  font-size: clamp(44px, 5.2vw, 76px);
  line-height: 1.02;
}

.lead {
  max-width: 50ch;
  margin-bottom: 32px;
  font-size: 18px;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(2, max-content);
  gap: 12px 32px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-soft);
}

.hero-meta li,
.signup-points li,
.price-card li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.hero-meta li::before,
.signup-points li::before,
.price-card li::before {
  content: "";
  flex: none;
  width: 20px;
  height: 20px;
  margin-top: 1px;
  border-radius: 50%;
  background: var(--accent-soft) var(--check) center / 11px no-repeat;
}

.hero-visual {
  position: relative;
  height: 580px;
  border: 1px solid var(--line);
  border-radius: 40px;
  background:
    radial-gradient(circle at 50% 50%, rgba(224, 112, 58, 0.12), transparent 40%),
    linear-gradient(160deg, #f9fafb, #f1f3f6);
  isolation: isolate;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background-image: radial-gradient(rgba(21, 23, 28, 0.1) 1px, transparent 1.5px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(circle at 50% 50%, #000 20%, transparent 72%);
  mask-image: radial-gradient(circle at 50% 50%, #000 20%, transparent 72%);
}

.orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(440px, 80%);
  aspect-ratio: 1;
  translate: -50% -50%;
  border: 1.5px dashed rgba(21, 23, 28, 0.16);
  border-radius: 50%;
  animation: spin 90s linear infinite;
}

.orbit-inner {
  position: absolute;
  inset: 16%;
  border: 1px solid rgba(21, 23, 28, 0.08);
  border-radius: 50%;
}

.chip {
  position: absolute;
  display: inline-grid;
  place-items: center;
  min-width: 48px;
  height: 34px;
  padding: 0 12px;
  translate: -50% -50%;
  border-radius: 999px;
  background: var(--tint);
  color: var(--tone);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  box-shadow: 0 0 0 4px #fff, 0 8px 18px rgba(21, 23, 28, 0.08);
  animation: spin 90s linear infinite reverse;
}

.c1 { top: 0; left: 50%; }
.c2 { top: 25%; left: 93.3%; }
.c3 { top: 75%; left: 93.3%; }
.c4 { top: 100%; left: 50%; }
.c5 { top: 75%; left: 6.7%; }
.c6 { top: 25%; left: 6.7%; }

.greet {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 1;
  display: grid;
  justify-items: center;
  gap: 14px;
  translate: -50% -50%;
  text-align: center;
}

.greet-word {
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: clamp(64px, 7vw, 108px);
  font-style: italic;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  white-space: nowrap;
  transition: opacity 0.35s ease, translate 0.35s ease;
}

.greet[data-lang="zh"] .greet-word {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: clamp(54px, 6vw, 92px);
  font-style: normal;
}

.greet-word.is-out {
  opacity: 0;
  translate: 0 12px;
}

.greet-lang {
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--tint);
  color: var(--tone);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: background-color 0.35s, color 0.35s;
}

.float-card {
  position: absolute;
  z-index: 2;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  box-shadow: var(--shadow);
  animation: float 7s ease-in-out infinite;
}

.card-lesson {
  top: 40px;
  left: -32px;
  width: 256px;
}

.card-progress {
  right: -28px;
  bottom: 88px;
  width: 224px;
  animation-delay: -2.5s;
}

.card-trial {
  left: 40px;
  bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  animation-delay: -5s;
}

.fc-label {
  margin-bottom: 4px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.fc-title {
  margin-bottom: 14px;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
}

.fc-person {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.fc-person b {
  display: block;
  font-size: 14px;
  line-height: 1.3;
}

.fc-person small {
  font-size: 12px;
  color: var(--ink-soft);
}

.fc-big {
  margin-bottom: 12px;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 48px;
  font-weight: 700;
  line-height: 1;
}

.bar {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-2);
}

.bar i {
  display: block;
  width: 70%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-bright), var(--accent));
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #1f9d63;
  box-shadow: 0 0 0 4px rgba(31, 157, 99, 0.16);
}

.avatar {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--tint);
  color: var(--tone);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

@keyframes spin {
  to { rotate: 360deg; }
}

@keyframes float {
  50% { translate: 0 -10px; }
}

.ticker {
  overflow: hidden;
  padding: 22px 0;
  border-block: 1px solid var(--line);
}

.ticker-track {
  display: flex;
  width: max-content;
  animation: marquee 36s linear infinite;
}

.ticker-track span {
  display: inline-flex;
  align-items: center;
  gap: 44px;
  padding-right: 44px;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 30px;
  font-style: italic;
  font-weight: 500;
  line-height: 1.2;
}

.ticker-track span::after {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

@keyframes marquee {
  to { transform: translateX(-50%); }
}

.section {
  padding: 112px var(--gutter);
}

.section-head {
  max-width: 720px;
  margin-bottom: 56px;
}

.section-head h2,
.method-head h2,
.signup-copy h2 {
  margin-bottom: 18px;
  font-size: clamp(38px, 4.4vw, 60px);
}

.section-head p:not(.eyebrow),
.method-head p:not(.eyebrow),
.signup-copy > p:not(.eyebrow) {
  max-width: 60ch;
  font-size: 17px;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.lang-grid,
.tutor-grid,
.price-grid,
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.lang-card {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}

.lang-card:hover {
  transform: translateY(-4px);
  border-color: transparent;
  box-shadow: var(--shadow);
}

.lang-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 28px;
}

.lang-code {
  display: inline-grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 18px;
  background: var(--tint);
  color: var(--tone);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.lang-native {
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 24px;
  font-style: italic;
  color: var(--ink-mute);
}

.ticker-track span[lang="zh"],
.lang-native[lang="zh"] {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-style: normal;
}

.ticker-track span[lang="zh"] {
  font-size: 26px;
}

.lang-native[lang="zh"] {
  font-size: 20px;
}

.lang-card h3,
.tutor h3 {
  margin-bottom: 10px;
  font-size: 32px;
}

.lang-card p,
.tutor p {
  font-size: 15px;
  color: var(--ink-soft);
}

.tutors {
  background: var(--surface);
}

.tutor {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  isolation: isolate;
  transition: transform 0.25s, box-shadow 0.25s;
}

.tutor:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.tutor::after {
  content: attr(data-lang);
  position: absolute;
  top: -24px;
  right: -4px;
  z-index: -1;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 150px;
  font-style: italic;
  font-weight: 700;
  line-height: 1;
  text-transform: uppercase;
  color: var(--tint);
  pointer-events: none;
}

.tutor-top {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.tutor .avatar {
  width: 64px;
  height: 64px;
  font-size: 19px;
}

.avatar-icon::before {
  content: "";
  width: 28px;
  height: 28px;
  background: currentColor;
  -webkit-mask: var(--bubble) center / contain no-repeat;
  mask: var(--bubble) center / contain no-repeat;
}

.tutor h3 {
  font-size: 28px;
  text-wrap: balance;
}

.tutor-lang {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--tone);
}

.tutor p {
  flex: 1;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.tags li {
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-soft);
}

.method {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 64px;
  align-items: start;
  padding: 112px var(--gutter);
}

.steps {
  margin-top: 40px;
  border-bottom: 1px solid var(--line);
}

.steps li {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.step-num {
  grid-row: span 2;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 46px;
  font-weight: 600;
  line-height: 1;
  color: var(--accent);
}

.steps strong {
  font-size: 18px;
}

.steps span {
  color: var(--ink-soft);
}

.method-panel {
  position: sticky;
  top: 104px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.panel-label,
.price-tag {
  margin-bottom: 8px;
  font-family: "Manrope", system-ui, sans-serif;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.format {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.format h3 {
  margin-bottom: 6px;
  font-size: 28px;
}

.format p {
  font-size: 15px;
  color: var(--ink-soft);
}

.panel-note {
  margin-top: 20px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  font-size: 13px;
  color: var(--ink-soft);
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0 var(--gutter);
  border-block: 1px solid var(--line);
}

.stat {
  padding: 44px 32px;
  border-left: 1px solid var(--line);
}

.stat:first-child {
  padding-left: 0;
  border-left: 0;
}

.stat b {
  display: block;
  margin-bottom: 10px;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 62px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat span {
  font-size: 14px;
  color: var(--ink-soft);
}

.price-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 36px 32px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: transform 0.25s, box-shadow 0.25s;
}

.price-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.price-card.featured {
  border: 1.5px solid var(--accent);
  background: linear-gradient(180deg, #fff7f2, #fff 45%);
  box-shadow: 0 30px 70px rgba(179, 80, 29, 0.14);
}

.badge {
  position: absolute;
  top: -13px;
  left: 32px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.price {
  margin-top: 10px;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 64px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.price span {
  font-family: "Manrope", system-ui, sans-serif;
  font-size: 0.45em;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--ink-soft);
}

.price-sub {
  margin-top: 8px;
  color: var(--ink-soft);
}

.price-card ul {
  display: grid;
  align-content: start;
  gap: 12px;
  flex: 1;
  margin: 24px 0 30px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  color: var(--ink-soft);
}

.reviews {
  padding: 112px var(--gutter);
  background: var(--surface);
}

.review {
  display: flex;
  flex-direction: column;
  gap: 28px;
  min-height: 300px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.review blockquote {
  flex: 1;
}

.review blockquote::before {
  content: "“";
  display: block;
  height: 38px;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 84px;
  line-height: 0.9;
  color: var(--tone);
}

.review blockquote p {
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 25px;
  font-style: italic;
  font-weight: 500;
  line-height: 1.3;
}

.review figcaption {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.45;
  color: var(--ink-soft);
}

.review figcaption b {
  display: block;
  font-size: 15px;
  color: var(--ink);
}

.faq {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 64px;
  align-items: start;
}

.faq .section-head {
  position: sticky;
  top: 112px;
  margin-bottom: 0;
}

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

details {
  padding: 0 24px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
}

details[open] {
  border-color: transparent;
  box-shadow: var(--shadow-sm);
}

summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 0;
  font-size: 17px;
  font-weight: 700;
  list-style: none;
  cursor: pointer;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "";
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--surface) var(--plus) center / 12px no-repeat;
  transition: transform 0.25s, background-color 0.25s;
}

details[open] summary::after {
  transform: rotate(45deg);
  background-color: var(--accent-soft);
}

details p {
  max-width: 62ch;
  padding-bottom: 22px;
  color: var(--ink-soft);
}

.signup {
  padding: 0 var(--gutter) 112px;
}

.signup-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
  padding: 56px;
  border: 1px solid var(--line);
  border-radius: 40px;
  background:
    radial-gradient(circle at 0% 0%, rgba(224, 112, 58, 0.16), transparent 45%),
    radial-gradient(circle at 100% 100%, rgba(47, 85, 196, 0.1), transparent 45%),
    var(--surface);
}

.signup-points {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  font-size: 15px;
  font-weight: 600;
}

form {
  display: grid;
  gap: 16px;
  padding: 32px;
  border-radius: 28px;
  background: #fff;
  box-shadow: var(--shadow);
}

label {
  display: grid;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
}

input,
select {
  width: 100%;
  height: 54px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background-color: #fff;
  font: 500 15px/1.2 "Manrope", system-ui, sans-serif;
  color: var(--ink);
  transition: border-color 0.2s, box-shadow 0.2s;
}

input::placeholder {
  color: #8a909c;
}

select {
  appearance: none;
  padding-right: 44px;
  background: #fff var(--chevron) right 16px center / 12px no-repeat;
  cursor: pointer;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(179, 80, 29, 0.14);
}

.form-note {
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-mute);
}

.form-ok {
  padding: 12px 16px;
  border-radius: 14px;
  background: #e7f6ee;
  color: #17663f;
  font-size: 14px;
  font-weight: 700;
}

.footer {
  padding: 64px var(--gutter) 32px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 1.1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.footer-brand p {
  max-width: 34ch;
  margin-top: 14px;
  font-size: 15px;
  color: var(--ink-soft);
}

.footer-title {
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.footer-nav {
  display: grid;
  align-content: start;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
}

.footer-nav .footer-title {
  margin-bottom: 4px;
}

.footer-nav a {
  color: var(--ink-soft);
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--ink);
}

.legal {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.legal-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.copy {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  margin-top: 24px;
  font-size: 13px;
  color: var(--ink-mute);
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media (max-width: 1080px) {
  .lang-grid,
  .tutor-grid,
  .review-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 960px) {
  .hero,
  .method,
  .faq,
  .signup-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    min-height: 0;
    gap: 48px;
  }

  .hero-visual {
    width: 100%;
    max-width: 640px;
    height: 520px;
    justify-self: center;
  }

  .card-lesson {
    left: 20px;
  }

  .card-progress {
    right: 20px;
  }

  .method-panel,
  .faq .section-head {
    position: static;
  }

  .faq {
    gap: 0;
  }

  .faq .section-head {
    margin-bottom: 40px;
  }

  .price-grid {
    grid-template-columns: minmax(0, 1fr);
    max-width: 560px;
  }

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

  .stat,
  .stat:first-child {
    padding: 32px 24px;
    border-left: 0;
  }

  .stat:nth-child(odd) {
    padding-left: 0;
  }

  .stat:nth-child(even) {
    border-left: 1px solid var(--line);
  }

  .stat:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .signup-card {
    gap: 36px;
    padding: 40px;
  }
}

@media (max-width: 1000px) {
  .nav-links,
  .btn-nav {
    display: none;
  }

  .burger {
    display: inline-grid;
  }

  .nav.open .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--gutter) 24px;
    border-bottom: 1px solid var(--line);
    background: #fff;
    box-shadow: 0 24px 40px rgba(21, 23, 28, 0.08);
  }

  .nav.open .nav-links a {
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
    font-size: 17px;
    color: var(--ink);
  }

  .nav.open .nav-links .nav-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    margin-top: 16px;
    border: 0;
    border-radius: 999px;
    background: var(--ink);
    color: #fff;
    font-size: 15px;
  }
}

@media (max-width: 640px) {
  .nav {
    gap: 16px;
  }

  .logo {
    gap: 8px;
    font-size: 24px;
  }

  .lang-grid,
  .tutor-grid,
  .review-grid,
  .footer-top {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-brand {
    grid-column: auto;
  }

  .section,
  .method,
  .reviews {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .section-head {
    margin-bottom: 40px;
  }

  .hero {
    padding-top: 28px;
    padding-bottom: 56px;
  }

  .lead {
    font-size: 17px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-meta {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-visual {
    height: 440px;
    border-radius: 28px;
  }

  .orbit {
    width: min(300px, 86%);
  }

  .chip {
    min-width: 40px;
    height: 28px;
    padding: 0 9px;
    font-size: 11px;
  }

  .greet-word {
    font-size: 60px;
  }

  .greet[data-lang="zh"] .greet-word {
    font-size: 52px;
  }

  .card-lesson {
    top: 16px;
    left: 14px;
    width: 206px;
    padding: 12px 14px;
  }

  .card-lesson .fc-title {
    margin-bottom: 10px;
    font-size: 22px;
  }

  .fc-person {
    padding-top: 10px;
  }

  .fc-person .avatar {
    width: 36px;
    height: 36px;
    font-size: 12px;
  }

  .card-progress {
    right: 14px;
    bottom: 16px;
    width: 172px;
    padding: 12px 14px;
  }

  .card-progress .fc-big {
    font-size: 34px;
  }

  .card-trial {
    display: none;
  }

  .tutor::after {
    font-size: 120px;
  }

  .stat b {
    font-size: 46px;
  }

  .signup {
    padding-bottom: 80px;
  }

  .signup-card {
    padding: 28px 20px;
    border-radius: 28px;
  }

  form {
    padding: 22px;
    border-radius: 22px;
  }
}