:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #5f6b7a;
  --soft: #eef3f7;
  --paper: #f8fafc;
  --white: #ffffff;
  --line: rgba(17, 24, 39, 0.12);
  --navy: #132238;
  --blue: #2563eb;
  --cyan: #0891b2;
  --green: #16825d;
  --amber: #b7791f;
  --shadow: 0 26px 80px rgba(19, 34, 56, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 8%, rgba(37, 99, 235, 0.12), transparent 30%),
    radial-gradient(circle at 88% 0%, rgba(8, 145, 178, 0.14), transparent 34%),
    var(--paper);
  line-height: 1.7;
}

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

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

button,
input {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  min-height: 72px;
  padding: 12px clamp(18px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
  background: rgba(248, 250, 252, 0.88);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--white);
  box-shadow: 0 10px 24px rgba(19, 34, 56, 0.18);
}

nav {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: clamp(12px, 3vw, 32px);
  color: var(--muted);
  font-size: 15px;
  white-space: nowrap;
}

nav a:hover,
footer a:hover {
  color: var(--blue);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--navy);
  color: var(--white);
  font-weight: 800;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(330px, 0.65fr);
  gap: clamp(28px, 6vw, 86px);
  align-items: center;
  min-height: calc(100svh - 72px);
  padding: clamp(44px, 7vw, 100px) clamp(18px, 5vw, 72px);
}

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

.eyebrow,
.section-label,
.case-tag,
.insight-grid span {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 820px;
  margin-bottom: 18px;
  font-size: clamp(46px, 7vw, 94px);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 4.8vw, 58px);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: clamp(20px, 2.1vw, 26px);
  line-height: 1.25;
  letter-spacing: 0;
}

.subtitle {
  margin-bottom: 30px;
  color: #334155;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
}

.hero-actions,
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 900;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover,
.reward-btn:hover {
  transform: translateY(-2px);
}

.btn.primary {
  background: var(--blue);
  color: var(--white);
  box-shadow: 0 14px 34px rgba(37, 99, 235, 0.25);
}

.btn.secondary {
  background: var(--navy);
  color: var(--white);
}

.btn.outline {
  border-color: var(--line);
  background: var(--white);
}

.trust-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.trust-strip span {
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--muted);
  font-weight: 800;
}

.hero-card {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.74);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow);
}

.hero-card img {
  width: 100%;
  aspect-ratio: 4 / 4.7;
  object-fit: cover;
}

.hero-card div {
  padding: 24px;
}

.hero-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 24px;
}

.hero-card p,
.section-head p,
.story p,
.capability-panel span,
.insight-grid p,
.quiz-copy p,
.community p,
.booking-card p,
.flip-front p,
.flip-back p {
  color: var(--muted);
}

.proof-bar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0 clamp(18px, 5vw, 72px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 14px 44px rgba(19, 34, 56, 0.08);
}

.proof-bar div {
  padding: clamp(22px, 4vw, 36px);
  border-right: 1px solid var(--line);
}

.proof-bar div:last-child {
  border-right: 0;
}

.proof-bar strong {
  display: block;
  margin-bottom: 8px;
  color: var(--navy);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
}

.proof-bar span {
  color: var(--muted);
}

section {
  scroll-margin-top: 86px;
}

.about,
.cases,
.insights,
.quiz,
.community,
.booking {
  padding: clamp(64px, 8vw, 116px) clamp(18px, 5vw, 72px);
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 430px);
  gap: clamp(28px, 6vw, 76px);
  align-items: start;
}

.story {
  max-width: 850px;
}

.story p {
  font-size: 18px;
}

blockquote {
  margin: 30px 0 0;
  padding: 24px 28px;
  border-left: 5px solid var(--blue);
  border-radius: 8px;
  background: #eaf1ff;
  color: var(--navy);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 900;
}

.capability-panel,
.quiz-box,
.booking-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.capability-panel {
  padding: 28px;
}

.capability-panel ul {
  display: grid;
  gap: 18px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.capability-panel li {
  padding: 18px;
  border-radius: 8px;
  background: var(--soft);
}

.capability-panel strong {
  display: block;
  margin-bottom: 5px;
}

.cases {
  background: #0f1a2b;
  color: var(--white);
}

.cases .section-label {
  color: #7dd3fc;
}

.cases .section-head p {
  color: rgba(255, 255, 255, 0.68);
}

.section-head {
  max-width: 900px;
  margin-bottom: clamp(28px, 5vw, 56px);
}

.case-slider {
  display: grid;
  grid-template-columns: repeat(3, minmax(300px, 1fr));
  gap: 18px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x mandatory;
}

.flip-card {
  min-height: 390px;
  perspective: 1200px;
  scroll-snap-align: start;
}

.flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 390px;
  transition: transform 0.65s ease;
  transform-style: preserve-3d;
}

.flip-card:hover .flip-inner,
.flip-card:focus-within .flip-inner,
.flip-card.is-flipped .flip-inner {
  transform: rotateY(180deg);
}

.flip-front,
.flip-back {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  backface-visibility: hidden;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.06));
}

.flip-back {
  transform: rotateY(180deg);
  background: #ffffff;
  color: var(--ink);
}

.flip-back em {
  color: var(--green);
  font-style: normal;
  font-weight: 900;
}

.chart {
  position: relative;
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
}

.chart span {
  display: block;
  width: var(--value);
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #7dd3fc, #60a5fa, #34d399);
}

.insights {
  background: var(--white);
}

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

.insight-grid article {
  min-height: 280px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
}

.insight-grid a {
  display: inline-flex;
  margin-top: 18px;
  color: var(--blue);
  font-weight: 900;
}

.quiz {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(340px, 0.72fr);
  gap: clamp(28px, 6vw, 74px);
  align-items: center;
}

.quiz-box {
  display: grid;
  gap: 14px;
  padding: 28px;
}

.quiz-box label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
  font-weight: 800;
}

.quiz-box output {
  display: block;
  min-height: 70px;
  padding: 16px;
  border-radius: 8px;
  background: #eaf7f2;
  color: #14533f;
  font-weight: 900;
}

.community {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.7fr);
  gap: clamp(28px, 6vw, 74px);
  background: #eef6ff;
}

.reward-panel {
  display: grid;
  gap: 12px;
}

.reward-btn {
  min-height: 52px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  cursor: pointer;
  color: var(--navy);
  font-weight: 900;
  box-shadow: 0 10px 26px rgba(19, 34, 56, 0.08);
}

.reward-btn.is-done {
  border-color: rgba(22, 130, 93, 0.3);
  background: #eaf7f2;
  color: var(--green);
}

.booking {
  background: linear-gradient(135deg, #0f1a2b, #16345c 58%, #0f766e);
}

.booking-card {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(28px, 5vw, 54px);
}

.booking-card small {
  display: block;
  margin-top: 18px;
  color: var(--muted);
}

.floating-cta {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 40;
  display: grid;
  gap: 8px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.floating-cta.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.floating-cta a {
  min-width: 108px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--blue);
  color: var(--white);
  text-align: center;
  font-size: 14px;
  font-weight: 900;
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.26);
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(18px, 5vw, 72px);
  background: #ffffff;
  color: var(--muted);
}

@media (max-width: 1040px) {
  .site-header {
    grid-template-columns: auto 1fr;
  }

  .header-cta {
    display: none;
  }

  nav {
    justify-self: end;
  }

  .hero,
  .about-layout,
  .quiz,
  .community {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-card {
    max-width: 520px;
  }

  .proof-bar,
  .insight-grid {
    grid-template-columns: 1fr;
  }

  .proof-bar div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .proof-bar div:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 680px) {
  .site-header {
    min-height: 64px;
    padding: 10px 14px;
    gap: 12px;
  }

  .brand img {
    width: 36px;
    height: 36px;
  }

  nav {
    gap: 9px;
    font-size: 13px;
  }

  .hero {
    padding-top: 36px;
  }

  .hero-actions,
  .cta-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
    min-height: 50px;
  }

  .trust-strip {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .trust-strip span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 8px 6px;
    text-align: center;
    font-size: 13px;
  }

  .case-slider {
    display: flex;
  }

  .flip-card {
    min-width: 88vw;
  }

  .floating-cta {
    left: 10px;
    right: 10px;
    bottom: 10px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .floating-cta a {
    min-width: 0;
    padding: 10px 8px;
    font-size: 13px;
  }

  footer {
    flex-direction: column;
    align-items: flex-start;
    padding-bottom: 84px;
  }
}