:root {
  --color-primary: #23b364;
  --color-white: #ffffff;
  --color-dark: #121212;
  --color-text-dark: #282d34;
  --color-text-light: #c2c7d0;
  --color-text-muted: #7a8699;
  --color-bg-light: #f0f0f0;
  --color-bg-dark-accent: #22164b;
}

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

body {
  margin: 0;
  padding: 0;
  font-family: 'Poppins', sans-serif;
  background-color: var(--color-dark);
  color: var(--color-white);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  padding: 12px 24px;
  border-radius: 8px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 16px;
  line-height: 24px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.btn:hover {
  background-color: #1fa058;
}

.btn-sm {
  padding: 8px 24px;
  font-size: 14px;
  line-height: 20px;
  border-radius: 4px;
}

.text-green {
  color: var(--color-primary);
}

.section-title {
  font-weight: 600;
  font-size: 28px;
  line-height: 36px;
  text-align: center;
  margin: 0;
  color: var(--text-text-primary, #282D34);
}

.section-subtitle {
  font-weight: 600;
  font-size: 40px;
  line-height: 1.2;
  text-align: center;
  margin: 8px 0 0 0;
  font-style: italic;
}

.section-description {
  font-weight: 400;
  font-size: 14px;
  line-height: 20px;
  color: var(--color-text-muted);
  text-align: center;
  max-width: 692px;
  margin: 24px auto 0;
}

@media (max-width: 768px) {
  .section-subtitle {
    font-size: 32px;
  }
}



/* previous css */

:root {
  --color-primary: #23b364;
  --color-secondary: #4e439a;
  --color-dark-bg: #121212;
  --color-white: #ffffff;
  --color-text-primary: #ffffff;
  --color-text-secondary: #c2c7d0;
  --color-text-muted: #7a8699;
  --color-text-dark: #282d34;
  --font-roboto: 'Roboto', sans-serif;
  --font-poppins: 'Poppins', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Poppins", sans-serif;
  background-color: var(--color-dark-bg);
  color: var(--color-text-primary);
  overflow-x: hidden;
}

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

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.btn {
  display: inline-block;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
  font-size: 16px;
  line-height: 24px;
  padding: 12px 24px;
  border-radius: 8px;
  text-align: center;
  transition: background-color 0.3s ease;
}

.btn:hover {
  opacity: 0.9;
}

section {
  position: relative;
  overflow: hidden;
}

.section-padding {
  padding-top: 100px;
  padding-bottom: 100px;
}

.text-gradient-green {
  background: linear-gradient(270deg, #7f6cff 0%, #23b364 18.82%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-fill-color: transparent;
}

@media (max-width: 992px) {
  .section-padding {
    padding-top: 60px;
    padding-bottom: 60px;
  }
}

/* 内容css */

/* CSS for section section:header */
.site-header {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(0, 0, 0, 0.8);
    padding: 16px 0;
  }
  .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .logo {
    display: block;
    width: 185px;
    height: 32px;
  }
  .logo-images {
    position: relative;
    width: 100%;
    height: 100%;
  }
  .logo-images img {
    position: absolute;
  }
  .logo-img-1 { top: 0; left: 0; width: 41.28px; height: 31.2px; }
  .logo-img-2 { top: 11.91px; left: 50.36px; width: 42.5px; height: 20.1px; }
  .logo-img-3 { top: 6.98px; left: 96.03px; width: 88.79px; height: 24.6px; }
  .logo-img-4 { top: 24.7px; left: 36.62px; width: 6.49px; height: 6.49px; }

  .main-nav ul {
    display: flex;
    gap: 40px;
  }
  .main-nav li a {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-white);
    transition: color 0.3s ease;
  }
  .main-nav li a:hover, .main-nav li:first-child a {
    text-shadow: 0px 4px 4px rgba(0, 0, 0, 0.25);
  }
  .hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
  }
  .hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 5px 0;
  }

  @media (max-width: 992px) {
    .main-nav {
      display: none;
    }
    .hamburger {
      display: block;
    }
  }

/* CSS for section section:hero */
.hero-section {
    padding-top: 160px; /* 80px header + 80px padding */
    padding-bottom: 80px;
    background: radial-gradient(173.07% 205.27% at 50% 50%, #24184e 0%, #000000 69.03%, rgba(36, 24, 78, 0.5) 100%);
    min-height: 850px;
    display: flex;
    align-items: center;
  }
  .hero-bg-shape {
    position: absolute;
    top: 71px;
    left: 660px;
    width: 1678px;
    height: 1503px;
    background-image: url('images/01ec1eb01c5c3e9751aa91d2003cabf9826e17dc.png');
    background-size: contain;
    background-repeat: no-repeat;
    transform: rotate(-30deg);
    z-index: 0;
    opacity: 0.5;
  }
  .hero-container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 24px;
  }
  .hero-content {
    flex: 1;
    max-width: 626px;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  .hero-subtitle-small {
    font-size: 20px;
    font-weight: 600;
    line-height: 28px;
    margin: 0 0 24px;
  }
  .hero-title {
    font-size: 64px;
    font-weight: 600;
    line-height: 72px;
    margin: 0;
  }
  .hero-subtitle-large {
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
    margin: 24px 0;
  }
  .hero-image-wrapper {
    flex: 1;
    max-width: 550px;
  }
  .hero-image {
    width: 100%;
    height: auto;
  }
  @media (max-width: 992px) {
    .hero-section {
      padding-top: 120px;
      text-align: center;
    }
    .hero-container {
      flex-direction: column;
      gap: 40px;
    }
    .hero-title {
      font-size: 48px;
      line-height: 56px;
    }
    .hero-bg-shape {
      left: 50%;
      transform: translateX(-50%) rotate(-30deg);
      width: 100%;
    }
  }

/* CSS for section section:what-we-offer */
.offer-header {
    text-align: center;
    max-width: 1200px;
    margin: 0 auto 40px;
  }
  .offer-title {
    font-size: 28px;
    font-weight: 600;
    line-height: 36px;
    color: var(--color-text-dark);
    margin: 0 0 8px;
  }
  .offer-subtitle {
    font-size: 40px;
    font-weight: 600;
    line-height: 36px;
    color: var(--color-primary);
    margin: 0 0 24px;
  }
  .offer-description {
    font-size: 14px;
    line-height: 20px;
    color: var(--color-text-muted);
    margin: 0;
  }
  .offer-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .offer-card {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    color: var(--color-white);
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    min-height: 300px;
  }
  .offer-card-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: linear-gradient(0deg, #000000 0%, #24184e 100%);
  }
  .offer-card-bg img {
    position: absolute;
    object-fit: cover;
    transform: scaleX(-1);
  }
  .bg-pattern-1 { top: -148px; left: -104px; width: 551px; height: 436px; transform: rotate(-15.32deg); mask-image: linear-gradient(0deg, rgba(217, 217, 217, 0) 0%, #737373 100%); }
  .bg-illustration-1 { bottom: 0; left: 8px; width: 369px; height: 246px; }
  .bg-pattern-2 { top: -145px; left: -123px; width: 702px; height: 480px; transform: rotate(177.39deg); mask-image: linear-gradient(0deg, rgba(217, 217, 217, 0) 0%, #737373 100%); }
  .bg-illustration-2 { bottom: 0; left: -60px; width: 404px; height: 228px; transform: rotate(180deg); }
  .bg-pattern-3 { top: -176px; left: -110px; width: 696px; height: 694px; transform: rotate(-44.53deg); mask-image: linear-gradient(0deg, rgba(217, 217, 217, 0) 0%, #737373 92.05%); }
  .bg-illustration-3 { bottom: 0; left: -54px; width: 426px; height: 240px; }

  .offer-card-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .card-title {
    font-size: 28px;
    font-weight: 700;
    line-height: 36px;
    margin: 0 0 16px;
    background: linear-gradient(150deg, #23B364 ,#7F6CFF);
    -webkit-background-clip: text;   /* Safari/Chrome */
    -webkit-text-fill-color: transparent;
    background-clip: text;           /* Firefox (新版本支持) */
    color: var(--color-primary);              /* fallback */
  }
  .card-subtitle {
    font-family: var(--font-poppins);
    font-size: 14px;
    font-weight: 600;
    line-height: 24px;
    margin: 0;
  }
  .card-desc {
    font-size: 14px;
    line-height: 20px;
    margin: 0 0 16px;
  }
  .card-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-left: 18px;
    opacity: 0.8;
  }
  .card-list li {
    font-size: 14px;
    line-height: 20px;
    position: relative;
  }
  .card-list li::before {
    content: '•';
    position: absolute;
    left: -18px;
    color: var(--color-primary);
  }

  @media (max-width: 992px) {
    .offer-cards {
      grid-template-columns: 1fr;
    }
    .offer-subtitle {
      font-size: 32px;
    }
  }

/* CSS for section section:why-vt-connect */
.why-section {
    background: radial-gradient(173.07% 205.27% at 50% 50%, #24184e 0%, #000000 69.03%, rgba(36, 24, 78, 0.5) 100%);
  }
  .why-bg-img-1 { position: absolute; top: 407px; left: -682px; width: 1017px; height: 680px; z-index: 0; }
  .why-bg-img-2 { position: absolute; top: -521px; left: 1318px; width: 1203px; height: 804px; z-index: 0; }
  .why-header {
    text-align: center;
    max-width: 1200px;
    margin: 0 auto 40px;
    position: relative;
    z-index: 1;
  }
  .why-title {
    font-size: 28px;
    font-weight: 600;
    line-height: 36px;
    margin: 0 0 8px;
  }
  .why-subtitle {
    font-size: 40px;
    font-weight: 600;
    line-height: 47px;
    color: var(--color-primary);
    margin: 0 0 24px;
  }
  .why-description {
    font-size: 14px;
    line-height: 20px;
    color: var(--color-text-secondary);
    margin: 0;
  }
  .why-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    position: relative;
    z-index: 1;
  }
  .why-card {
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  .why-card-icon, .why-card-icon-merged {
    width: 32px;
    height: 32px;
  }
  .why-card-icon-merged { position: relative; }
  .why-card-icon-merged img { position: absolute; }
  .why-card-title {
    font-size: 24px;
    font-weight: 600;
    line-height: 32px;
    margin: 0;
  }
  .why-card-text {
    font-size: 16px;
    font-weight: 600;
    line-height: 24px;
    color: var(--color-text-secondary);
    margin: 0;
  }

  @media (max-width: 992px) {
    .why-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .why-subtitle {
      font-size: 32px;
      line-height: 40px;
    }
  }
  @media (max-width: 768px) {
    .why-grid {
      grid-template-columns: 1fr;
    }
  }

/* CSS for section section:who-we-serve */
.serve-section {
    background-color: var(--color-dark-bg);
  }
  .serve-bg-decor { position: absolute; top: 100px; left: 1311px; width: 279px; height: 912px; z-index: 0; }
  .serve-bg-decor > div { position: absolute; }
  .decor-item-1 { top: 0; left: 0; width: 131px; height: 321px; background: linear-gradient(360deg, #4e439a 0%, rgba(78, 67, 154, 0) 100%); }
  .decor-item-2 { top: 321px; left: 0; width: 131px; height: 321px; background: linear-gradient(180deg, #23b364 0%, rgba(35, 179, 100, 0) 100%); }
  .decor-item-3 { top: 642px; left: 0; width: 131px; height: 321px; background: linear-gradient(180deg, #4e439a 0%, rgba(78, 67, 154, 0) 100%); }
  .decor-item-4 { top: 511px; left: 147px; width: 131px; height: 321px; background: linear-gradient(180deg, #23b364 0%, rgba(35, 179, 100, 0) 100%); }
  .decor-item-5 { top: 0; left: 147px; width: 131px; height: 321px; background: linear-gradient(360deg, #23b364 0%, rgba(35, 179, 100, 0) 100%); }
  .decor-item-6 { top: 351px; left: 147px; width: 131px; height: 131px; background-color: #23b364; border-radius: 50%; }

  .serve-container {
    display: flex;
    gap: 40px;
    align-items: center;
    position: relative;
    z-index: 1;
  }
  .serve-content {
    flex: 1;
    max-width: 480px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 110px;
  }
  .serve-text-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .serve-title {
    font-size: 28px;
    font-weight: 600;
    line-height: 36px;
    margin: 0;
  }
  .serve-subtitle {
    font-size: 40px;
    font-weight: 600;
    line-height: 47px;
    color: var(--color-primary);
    margin: 0 0 16px;
  }
  .serve-description {
    font-size: 14px;
    line-height: 20px;
    color: var(--color-text-secondary);
    margin: 0;
  }
  .serve-image-group {
    position: relative;
    width: 480px;
    height: 473px;
  }
  .serve-image-group img {
    position: absolute;
  }
  .serve-img-1 { top: 43px; left: -100px; width: 674px; height: 444px; }
  .serve-img-2 { top: -95px; left: 19px; width: 448px; height: 672px; }

  .serve-accordion {
    flex: 1;
    max-width: 680px;
    display: flex;
    flex-direction: column;
    gap: 24px;
  }
  .accordion-item {
    background-color: rgba(18, 18, 18, 0.7);
    border: 1px solid #2d3033;
    border-radius: 16px;
    padding: 32px;
    backdrop-filter: blur(4px);
    transition: all 0.3s ease;
  }
  .accordion-item.active {
    border-color: var(--color-primary);
  }
  .accordion-item h4 {
    font-size: 24px;
    font-weight: 600;
    line-height: 32px;
    margin: 0;
  }
  .accordion-item.active h4 {
    color: var(--color-primary);
  }
  .accordion-item p {
    font-size: 14px;
    line-height: 20px;
    color: var(--color-white);
    margin: 16px 0 0;
  }

  @media (max-width: 992px) {
    .serve-container {
      flex-direction: column;
    }
    .serve-content {
      max-width: 100%;
      align-items: center;
      text-align: center;
    }
    .serve-accordion {
      max-width: 100%;
      width: 100%;
    }
    .serve-bg-decor {
      display: none;
    }
  }

/* CSS for section section:about-us */
.about-banner {
    /* background: linear-gradient(297deg, #000000 0%, #4e439a 91.74%, #23b364 111.8%); */
    background: linear-gradient(271deg, #000 0.24%, #4E439A 81.9%, #23B364 99.76%);
    border-radius: 24px;
    padding: 32px;
    text-align: center;
    margin-bottom: 40px;
  }
  .about-banner-title {
    color: var(--color-white);
    font-size: 28px;
    font-weight: 600;
    line-height: 36px;
    margin: 0 0 16px;
  }
  .about-banner-subtitle {
    color: var(--color-white);
    font-size: 40px;
    font-weight: 600;
    line-height: 36px;
    margin: 0;
  }
  .about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
  .about-card {
    border: 1px solid #e8e9ea;
    border-radius: 40px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
  .about-card-text h4 {
    font-size: 24px;
    font-weight: 600;
    line-height: 32px;
    color: var(--color-text-dark);
    margin: 0 0 24px;
  }
  .about-card-text p, .about-card-text li {
    font-size: 14px;
    line-height: 20px;
    color: var(--color-text-muted);
    margin-bottom: 20px;
  }
  .about-card-text ul {
    padding-left: 20px;
    list-style: disc;
    color: var(--color-text-muted);
  }
  .link-blue {
    color: #0A36C7;
    font-weight: 600;
  }
  .about-card-image-wrapper {
    position: relative;
    height: 130px;
    margin-top: 60px;
  }
  .about-card-image-wrapper img {
    position: absolute;
    bottom: 0;
  }
  .about-img-1 { 
    left: -35%; width: 450px
  }
  /* iPad (横竖屏都覆盖) */
  @media (min-width: 768px) and (max-width: 1024px) {
    .about-img-1 {
      left: -10%;
    }
  }
  /* 显示器 / 桌面 */
  @media (min-width: 1025px) {
   .about-img-1 {
      left: 15%;
    }
  }

  .about-img-2 { left: -60%; height: 207px; }
  /* iPad (横竖屏都覆盖) */
  @media (min-width: 768px) and (max-width: 1024px) {
    .about-img-2 {
      left: -25%;
    }
  }
  /* 显示器 / 桌面 */
  @media (min-width: 1025px) {
   .about-img-2 {
      left: 0%;
    }
  }

  @media (max-width: 992px) {
    .about-grid {
      grid-template-columns: 1fr;
    }
    .about-banner-subtitle {
      font-size: 32px;
    }
  }

/* CSS for section section:contact */
.contact-section {
    display: flex;
    align-items: center;
    min-height: 600px;
  }
  .contact-bg-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 55.7%;
    height: 100%;
    mask-image: linear-gradient(90deg, rgba(217, 217, 217, 0) 0%, #737373 90.09%);
  }
  .contact-bg-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  /* iPad (横竖屏都覆盖) */
  @media (min-width: 768px) and (max-width: 1024px) {
    .contact-bg-image img {
      opacity: 60%;
    }
  }
  /* 显示器 / 桌面 */
  @media (min-width: 1025px) {
   .contact-bg-image img {
      opacity: 60%;
    }
  }
  .contact-container {
    position: relative;
    z-index: 1;
    display: flex;
    gap: 150px;
    align-items: center;
  }
  .contact-content {
    flex: 1;
    max-width: 525px;
  }
  .contact-title {
    font-size: 48px;
    font-weight: 600;
    line-height: 56px;
    margin: 0 0 16px;
  }
  .contact-description {
    font-size: 14px;
    line-height: 20px;
    color: var(--color-text-secondary);
    margin: 0;
  }
  .contact-form {
    flex: 1;
    max-width: 525px;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  /* 仅桌面端（比如 min-width 1024px 以上才生效） */
  @media (min-width: 1024px) {
    .contact-form {
      padding-left: 80px;
    }
  }
  .form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .form-group label {
    font-size: 14px;
    line-height: 20px;
    color: var(--color-text-secondary);
  }
  .form-group input, .form-group textarea {
    background-color: #1d1d21;
    border: 1px solid #2d3033;
    border-radius: 4px;
    padding: 14px 12px;
    font-family: var(--font-roboto);
    font-size: 14px;
    color: var(--color-text-muted);
    width: 100%;
  }
  .form-group input::placeholder, .form-group textarea::placeholder {
    color: var(--color-text-muted);
  }
  .form-group textarea {
    resize: vertical;
  }
  .contact-form .btn {
    align-self: flex-start;
    /* width: 100px; */
    font-family: 'Poppins', sans-serif;
  }

  @media (max-width: 992px) {
    .contact-container {
      flex-direction: column;
      gap: 40px;
      text-align: center;
    }
    .contact-bg-image {
      width: 100%;
      opacity: 0.2;
      mask-image: none;
    }
    .contact-form .btn {
      align-self: center;
    }
  }
  /* 国家下拉菜单 */
  .choices__inner { 
    font-size: 16px; 
    background-color: #1d1d21;
    border: 1px solid #2d3033;
    border-radius: 4px;
    padding: 14px 12px;
    font-family: var(--font-roboto);
    font-size: 14px;
    color: var(--color-text-muted);
    width: 100%;
  } /* 收起状态字号 */
    .choices__list--dropdown .choices__item { 
      font-size: 14px; 
      color: var(--color-text-muted);
      height: 50px;
    } 
    /* contact-overrides.css */
.contact-form .choices {  /* 外层容器类名按你页面替换 */
  margin-bottom: 0;
}
/* 占位符：取消半透明并统一颜色 */
.contact-form .choices__placeholder {
  opacity: 1 !important;
  color: var(--color-text-muted) !important;
}

/* --- minimal accordion animation --- */
.accordion-item { cursor: pointer; }

.accordion-item p{
  max-height: 0;          /* 收起 */
  overflow: hidden;
  margin: 0;
  opacity: 0;
  transition: max-height .25s ease, opacity .2s ease;
}

.accordion-item.active p{
  max-height: 240px;      /* 视内容多少可调 */
  margin-top: 16px;
  opacity: 1;
}

/* 可选：hover 时轻微描边 */
.accordion-item:hover{ border-color:#3a3f45; }

@media (max-width: 768px) {
  .mobile-break { display: inline; }
}
@media (min-width: 769px) {
  .mobile-break { display: none; }
}