:root {
  --green-950: #0f3128;
  --green-900: #123c31;
  --green-800: #1b5b43;
  --green-700: #24714f;
  --green-100: #e8f2eb;
  --gold-700: #b4843d;
  --gold-200: #efe2ca;
  --paper: #fbfaf4;
  --paper-2: #f4f1e8;
  --ink: #17201c;
  --muted: #66746e;
  --line: rgba(24, 77, 58, 0.16);
  --white: #ffffff;
  --shadow: 0 28px 80px rgba(18, 60, 49, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

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

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 30;
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 28px;
  padding: 18px clamp(20px, 5vw, 72px);
  color: var(--white);
  transition: background 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  background: rgba(251, 250, 244, 0.94);
  color: var(--ink);
  box-shadow: 0 14px 50px rgba(15, 49, 40, 0.1);
  backdrop-filter: blur(18px);
}

.brand {
  width: 178px;
  padding: 6px 0;
}

.site-header:not(.is-scrolled):not(.is-open) .brand img {
  filter: brightness(0) invert(1);
}

.main-nav {
  justify-self: end;
  display: flex;
  gap: 25px;
  font-size: 14px;
}

.main-nav a {
  opacity: 0.82;
}

.main-nav a:hover {
  opacity: 1;
}

.nav-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

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

.button.primary {
  border-color: var(--green-700);
  background: var(--green-700);
  color: var(--white);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.1);
  color: currentColor;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid currentColor;
  border-radius: 50%;
  background: transparent;
  color: inherit;
}

.menu-toggle span {
  display: block;
  width: 16px;
  height: 1px;
  margin: 5px auto;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-content: end;
  padding: 132px clamp(20px, 6vw, 88px) 0;
  overflow: hidden;
  color: var(--white);
  background: var(--green-950);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(15, 49, 40, 0.96) 0%, rgba(15, 49, 40, 0.82) 45%, rgba(15, 49, 40, 0.45) 100%),
    image-set(url("assets/jingtuitang-logo-teal-bg-web.jpg") type("image/jpeg"));
  background-size: cover;
  background-position: center;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 72% 22%, rgba(232, 210, 160, 0.28), transparent 30%),
    linear-gradient(120deg, transparent 56%, rgba(255, 255, 255, 0.06) 56% 58%, transparent 58%),
    repeating-linear-gradient(90deg, transparent 0 34px, rgba(255, 255, 255, 0.05) 34px 35px);
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 0.72fr);
  gap: clamp(34px, 7vw, 96px);
  align-items: end;
  width: min(1380px, 100%);
  margin: 0 auto;
  padding-bottom: 76px;
}

.hero-copy {
  max-width: 800px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--gold-700);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  line-height: 1.16;
  letter-spacing: 0;
}

h1 {
  max-width: 850px;
  font-size: clamp(44px, 6.2vw, 86px);
}

h2 {
  font-size: clamp(30px, 4vw, 56px);
}

h3 {
  font-size: 23px;
}

.hero-lead {
  max-width: 760px;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.84);
  font-size: clamp(17px, 1.8vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.hero-visual {
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(22px);
}

.visual-top {
  padding-bottom: 26px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.visual-top span,
.visual-top p,
.formula span {
  color: rgba(255, 255, 255, 0.68);
  font-size: 14px;
}

.visual-top strong {
  display: block;
  margin-top: 12px;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(58px, 7vw, 96px);
  line-height: 0.95;
}

.visual-top p {
  margin: 8px 0 0;
}

.formula {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 18px;
  align-items: center;
  padding: 28px 0;
}

.formula div {
  min-height: 110px;
  padding: 20px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
}

.formula b {
  display: block;
  font-size: 28px;
}

.formula i {
  color: var(--gold-200);
  font-size: 28px;
  font-style: normal;
}

.identity-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.identity-strip span {
  padding: 12px 8px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 13px;
  text-align: center;
}

.trust-bar {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  width: min(1380px, calc(100% - clamp(40px, 12vw, 176px)));
  margin: 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-bottom: 0;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(16px);
}

.trust-bar span {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  color: rgba(255, 255, 255, 0.82);
  font-weight: 700;
  text-align: center;
}

.section {
  padding: clamp(78px, 9vw, 134px) clamp(20px, 6vw, 88px);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(320px, 1fr);
  gap: clamp(34px, 8vw, 100px);
  align-items: start;
}

.section-title {
  max-width: 880px;
}

.section-title h2 + p,
.proof-copy p,
.contact-box p {
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.pain-list {
  display: grid;
  gap: 14px;
}

.pain-list article,
.model-card,
.identity-card,
.support-item,
.proof-stat,
.contact-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
}

.pain-list article {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  padding: 24px;
}

.pain-list article p {
  grid-column: 2;
}

.pain-list span,
.model-index,
.support-item b,
.join-steps b {
  color: var(--gold-700);
  font-weight: 800;
}

.pain-list p,
.model-card p,
.identity-card p,
.support-item p {
  margin: 12px 0 0;
  color: var(--muted);
}

.dark-section {
  color: var(--white);
  background: var(--green-950);
}

.dark-section .section-title {
  margin-bottom: 46px;
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.model-card {
  min-height: 300px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.08);
  box-shadow: none;
  border-color: rgba(255, 255, 255, 0.12);
}

.model-card h3 {
  margin-top: 56px;
}

.model-card p {
  color: rgba(255, 255, 255, 0.68);
}

.identity-section {
  background:
    linear-gradient(180deg, rgba(232, 242, 235, 0.75), rgba(251, 250, 244, 0.2));
}

.identity-section .section-title {
  margin-bottom: 44px;
}

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

.identity-card {
  min-height: 300px;
  padding: 32px;
}

.identity-card span {
  color: var(--gold-700);
  font-weight: 800;
}

.identity-card h3 {
  margin-top: 58px;
}

.support-section {
  background: var(--paper);
}

.support-head {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(260px, 0.5fr);
  gap: 60px;
  margin-bottom: 42px;
}

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

.support-item {
  min-height: 238px;
  padding: 28px;
  border-top: 0;
  border-left: 0;
  border-radius: 0;
  box-shadow: none;
  background: transparent;
}

.support-item h3 {
  margin-top: 32px;
}

.proof-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.75fr);
  gap: clamp(34px, 7vw, 88px);
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(15, 49, 40, 0.96), rgba(18, 60, 49, 0.82)),
    url("assets/jingtuitang-logo-teal-bg-web.jpg") center / cover;
}

.proof-copy p {
  color: rgba(255, 255, 255, 0.7);
}

.proof-stats {
  display: grid;
  gap: 14px;
}

.proof-stat {
  padding: 28px;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: none;
}

.proof-stat strong {
  display: block;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(38px, 5vw, 62px);
  line-height: 1;
}

.proof-stat span {
  display: block;
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.72);
}

.join-section {
  background: var(--paper-2);
}

.join-section .section-title {
  margin-bottom: 42px;
}

.join-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(320px, 1fr);
  gap: 34px;
}

.fit-list {
  display: flex;
  flex-wrap: wrap;
  align-content: start;
  gap: 12px;
}

.fit-list span {
  padding: 15px 20px;
  border: 1px solid rgba(36, 113, 79, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.64);
  color: var(--green-950);
  font-weight: 700;
}

.join-steps {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.join-steps div {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 18px;
  align-items: center;
  min-height: 72px;
  padding: 16px 22px;
  background: var(--paper);
}

.join-steps p {
  margin: 0;
  font-weight: 700;
}

.faq-section {
  background: var(--paper);
}

.faq-section .section-title {
  margin-bottom: 36px;
}

.faq-list {
  display: grid;
  gap: 12px;
  width: min(980px, 100%);
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 18px 50px rgba(18, 60, 49, 0.08);
}

.faq-item summary {
  cursor: pointer;
  padding: 20px 24px;
  color: var(--green-950);
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 21px;
  font-weight: 700;
  line-height: 1.35;
}

.faq-item p {
  margin: 0;
  padding: 0 24px 22px;
  color: var(--muted);
}

.contact-section {
  background: var(--paper);
}

.contact-box {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 460px);
  gap: clamp(30px, 6vw, 80px);
  width: min(1240px, 100%);
  margin: 0 auto;
  padding: clamp(30px, 5vw, 60px);
}

.contact-form {
  display: grid;
  gap: 16px;
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: var(--green-950);
  font-size: 14px;
  font-weight: 800;
}

.contact-form input,
.contact-form select {
  width: 100%;
  height: 50px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  color: var(--ink);
  font: inherit;
  padding: 0 14px;
}

.contact-form .button {
  width: 100%;
  border-radius: 8px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 34px clamp(20px, 6vw, 88px);
  background: var(--green-950);
  color: rgba(255, 255, 255, 0.68);
  font-size: 14px;
}

.site-footer strong {
  display: block;
  color: var(--white);
  font-size: 18px;
}

.site-footer p {
  max-width: 620px;
  margin: 0;
}

.reveal {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1100px) {
  .hero-grid,
  .split,
  .proof-section,
  .join-layout,
  .contact-box {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 900px) {
  .site-header {
    grid-template-columns: auto 1fr auto;
  }

  .main-nav,
  .nav-cta {
    display: none;
  }

  .menu-toggle {
    display: block;
    justify-self: end;
  }

  .site-header.is-open .main-nav {
    position: absolute;
    top: 100%;
    left: 20px;
    right: 20px;
    display: grid;
    gap: 0;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--paper);
    box-shadow: var(--shadow);
  }

  .site-header.is-open .main-nav a {
    padding: 12px;
  }

  .site-header.is-open .nav-cta {
    position: absolute;
    top: calc(100% + 205px);
    left: 32px;
    right: 32px;
    display: flex;
    color: var(--white);
    background: var(--green-700);
  }

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

@media (max-width: 640px) {
  .brand {
    width: 136px;
  }

  .site-header {
    padding: 14px 20px;
  }

  .hero {
    padding: 112px 20px 0;
  }

  .hero-grid {
    gap: 32px;
    padding-bottom: 36px;
  }

  .hero-actions,
  .formula,
  .identity-strip,
  .trust-bar,
  .model-grid,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .hero-visual {
    padding: 22px;
  }

  .trust-bar {
    width: calc(100% - 40px);
  }

  .section {
    padding: 70px 20px;
  }

  .pain-list article {
    grid-template-columns: 1fr;
  }

  .pain-list article p {
    grid-column: auto;
  }

  .model-card,
  .identity-card,
  .support-item {
    min-height: auto;
  }

  .model-card h3,
  .identity-card h3,
  .support-item h3 {
    margin-top: 30px;
  }

  .join-steps div {
    grid-template-columns: 42px 1fr;
  }

  .site-footer {
    display: grid;
  }
}