/* HelloWorld static site | shared stylesheet */
:root{
  --brand:#3978f6;--brand-dark:#2462df;--ink:#17233b;--muted:#69758b;
  --line:#e8edf5;--soft:#f5f8ff;--white:#fff;--shadow:0 18px 55px rgba(31,67,130,.10);
  --radius:20px;--container:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{margin:0;color:var(--ink);font-family:Inter,"PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.7;background:#fff}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input,textarea{font:inherit}
.container{width:min(var(--container),calc(100% - 48px));margin-inline:auto}
.site-header{height:78px;position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(16px);border-bottom:1px solid rgba(232,237,245,.8)}
.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:28px}
.brand{display:flex;align-items:center;gap:10px;font-size:23px;font-weight:800;letter-spacing:-.7px;color:#1b2c4b}
.brand-mark{width:36px;height:36px;border-radius:12px;background:linear-gradient(135deg,#5ca3ff,#3469ee);display:grid;place-items:center;color:#fff;font-size:18px;box-shadow:0 7px 18px #3978f633}
.nav{display:flex;align-items:center;gap:34px;color:#48566d;font-size:15px}
.nav a{transition:.2s}
.nav a:hover,.nav a.active{color:var(--brand)}
.header-actions{display:flex;align-items:center;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:999px;padding:12px 24px;font-weight:650;font-size:14px;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 9px 22px #3978f633}
.btn-primary:hover{background:var(--brand-dark);box-shadow:0 12px 28px #3978f644}
.btn-outline{border-color:#dbe5f5;color:#34445f;background:#fff;margin:0 auto;display: block;margin-top:23px;text-align: center}
.menu-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);font-size:21px}
.hero{position:relative;overflow:hidden;padding:86px 0 76px;background:radial-gradient(circle at 80% 25%,#e6f0ff 0,transparent 34%),linear-gradient(180deg,#f8fbff 0%,#fff 100%)}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;align-items:center;gap:56px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--brand);font-weight:700;font-size:13px;letter-spacing:1px;text-transform:uppercase}
.eyebrow:before{content:"";width:22px;height:2px;background:var(--brand)}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(38px,5vw,58px);line-height:1.18;letter-spacing:-1.8px;margin:18px 0 20px}
h2{font-size:clamp(29px,3.4vw,40px);line-height:1.25;letter-spacing:-1px;margin-bottom:14px}
h3{font-size:20px;line-height:1.4;margin-bottom:10px}
.lead{font-size:17px;color:var(--muted);max-width:590px;line-height:1.9}
.hero-buttons{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}
.hero-visual{position:relative}
.media-placeholder{position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden;text-align:center;min-height:230px}
.media-placeholder:before,.media-placeholder:after{content:"";position:absolute;border-radius:50%;width:280px;height:280px}
.media-placeholder:after{width:190px;height:190px}
.media-placeholder span{position:relative;z-index:1;font-size:13px;font-weight:650;letter-spacing:.5px;padding:12px}
.hero-visual .media-placeholder{min-height:420px;box-shadow:var(--shadow)}
.float-tag{position:absolute;bottom:24px;left:-22px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:13px 18px;box-shadow:var(--shadow);font-size:13px;font-weight:700}
.section{padding:88px 0}
.section-soft{background:var(--soft)}
.section-heading{text-align:center;max-width:720px;margin:0 auto 46px}
.section-heading p{color:var(--muted);margin:0}
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:26px;background:#fff;transition:transform .25s,box-shadow .25s,border-color .25s}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#d7e4fb}
.icon-box{width:48px;height:48px;display:grid;place-items:center;border-radius:15px;background:#edf4ff;color:var(--brand);font-size:22px;margin-bottom:20px}
.card p{color:var(--muted);font-size:14px;margin-bottom:0}
.number-list{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.number-item{padding:24px 18px;border-radius:18px;background:#fff;border:1px solid var(--line);text-align:center}
.number-item strong{display:block;color:var(--brand);font-size:24px;margin-bottom:7px}
.number-item span{font-size:14px;color:#526078}
.feature-row{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:60px;margin:42px 0}
.feature-row.reverse .feature-copy{order:2}
.feature-row.reverse .feature-media{order:1}
.feature-media .media-placeholder{min-height:330px}
.feature-copy p{color:var(--muted)}
.check-list{list-style:none;padding:0;margin:22px 0}
.check-list li{padding:7px 0;color:#4d5b72}
.check-list li:before{content:"✓";color:var(--brand);font-weight:800;margin-right:10px}
.download-band{padding:54px;border-radius:28px;background:linear-gradient(120deg,#2769ed,#5598ff);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:28px}
.download-band p{color:#e4edff;margin:0}
.download-band .btn{background:#fff;color:var(--brand)}
.testimonial{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px}
.testimonial p{color:#5c687d;font-size:14px}
.avatar-placeholder{width:42px;height:42px;border-radius:50%;background:#eaf1ff;display:grid;place-items:center;color:var(--brand);font-weight:800}
.person{display:flex;align-items:center;gap:12px;margin-top:18px;font-weight:700}
.page-hero{padding:72px 0 62px;background:linear-gradient(180deg,#f5f9ff,#fff);text-align:center}
.page-hero h1{font-size:46px;margin:12px 0}
.page-hero p{color:var(--muted);max-width:700px;margin:0 auto}
.breadcrumb{font-size:13px;color:#8a96a9;margin-bottom:18px}
.breadcrumb a{color:var(--brand)}
.faq-list{max-width:900px;margin:auto}
.faq-item{border:1px solid var(--line);border-radius:15px;margin-bottom:13px;overflow:hidden;background:#fff}
.faq-question{width:100%;display:flex;justify-content:space-between;align-items:center;text-align:left;padding:21px 24px;border:0;background:#fff;color:var(--ink);font-weight:700;cursor:pointer}
.faq-question span:last-child{font-size:22px;color:var(--brand);transition:transform .2s}
.faq-answer{display:none;padding:0 24px 22px;color:var(--muted);font-size:14px}
.faq-item.open .faq-answer{display:block}
.faq-item.open .faq-question span:last-child{transform:rotate(45deg)}
.contact-layout{display:grid;grid-template-columns:.9fr 1.1fr;gap:28px}
.contact-panel{border-radius:22px;background:#f4f8ff;padding:30px}
.contact-method{display:flex;gap:15px;margin:24px 0}
.contact-method .icon-box{flex:0 0 46px;margin:0}
.contact-method small{display:block;color:var(--muted)}
.contact-form{border:1px solid var(--line);border-radius:22px;padding:30px;background:#fff}
.form-row{margin-bottom:17px}
.form-row label{display:block;font-size:13px;font-weight:700;margin-bottom:7px}
.form-row input,.form-row textarea{width:100%;padding:13px 15px;border:1px solid #dfe6f0;border-radius:11px;outline:none;background:#fbfcff}
.form-row input:focus,.form-row textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px #3978f61a}
.form-row textarea{min-height:130px;resize:vertical}
.site-footer{background:#101d35;color:#c2ccdc;padding:58px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px}
.footer-brand{color:#fff}
.footer-desc{font-size:14px;color:#9eabc0;max-width:320px;margin-top:18px}
.footer-col h4{color:#fff;margin:0 0 17px;font-size:15px}
.footer-col a{display:block;color:#aab6c9;font-size:14px;margin:10px 0}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #2a3850;margin-top:42px;padding-top:20px;font-size:12px;color:#8998af;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.back-top{position:fixed;right:22px;bottom:22px;width:44px;height:44px;border:0;border-radius:50%;background:var(--brand);color:#fff;box-shadow:var(--shadow);cursor:pointer;display:none}
.back-top.show{display:block}
@media(max-width:900px){
 .nav{gap:18px}.hero-grid{gap:30px}.grid-4{grid-template-columns:repeat(2,1fr)}
 .number-list{grid-template-columns:repeat(3,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:700px){
 .container{width:min(100% - 34px,var(--container))}.site-header{height:68px}
 .menu-toggle{display:block}.nav{display:none;position:absolute;top:68px;left:0;right:0;padding:18px 24px 24px;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0}
 .nav.open{display:flex}.nav a{padding:12px 0;border-bottom:1px solid #f0f3f8}
 .header-actions .btn{display:none}.hero{padding:58px 0}.hero-grid,.feature-row,.contact-layout{grid-template-columns:1fr}
 .hero-visual .media-placeholder{min-height:280px}.float-tag{left:10px;bottom:12px}
 .section{padding:64px 0}.grid-2,.grid-3{grid-template-columns:1fr}.grid-4{grid-template-columns:1fr 1fr}
 .number-list{grid-template-columns:1fr 1fr}.feature-row{gap:24px}.feature-row.reverse .feature-copy,.feature-row.reverse .feature-media{order:initial}
 .download-band{padding:30px;align-items:flex-start;flex-direction:column}.page-hero{padding:54px 0}.page-hero h1{font-size:36px}
 .footer-grid{grid-template-columns:1fr 1fr;gap:26px}.footer-grid>div:first-child{grid-column:1/-1}
}
@media(max-width:420px){.grid-4,.number-list{grid-template-columns:1fr}.brand{font-size:20px}}


/* Homepage hero: layout aligned to supplied reference screenshot */
.hero-home{
  min-height:820px;
  height:min(820px,calc(100vh - 4px));
  padding:0;
  background:#eaf0f5;
  overflow:hidden;
  isolation:isolate;
}
.hero-bg-placeholder{
  position:absolute;inset:0;z-index:-2;
  display:flex;align-items:center;justify-content:center;
  /*background:
    linear-gradient(180deg,rgba(245,249,252,.68) 0%,rgba(245,249,252,.28) 48%,rgba(13,33,55,.16) 100%),
    linear-gradient(135deg,#dce6ed,#f5f7f8 48%,#cbd8e0);*/
  background: url(../images/head.a8337e0.jpg);  
  color:#68809a;
}
.hero-bg-placeholder:before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse at 50% 70%,rgba(65,92,120,.18),transparent 48%);
}
.hero-bg-placeholder span{
  position:absolute;left:50%;bottom:25%;transform:translateX(-50%);
  padding:10px 16px;border:1px dashed rgba(73,112,157,.42);
  border-radius:8px;background:rgba(255,255,255,.55);
  font-size:12px;color:#57708d;text-align:center;
}
.hero-home-content{
  position:relative;z-index:2;text-align:center;padding-top:88px;
}
.hero-brand-mark{display:none}
.hero-home h1{
  color:#0860f5;font-size:clamp(40px,4.4vw,72px);font-weight:800;
  letter-spacing:-2px;margin:0 0 8px;line-height:1.2;
}
.hero-home-subtitle{
  color:#40536a;font-size:clamp(15px,1.35vw,23px);
  line-height:1.6;margin:0 auto;max-width:1180px;
}
.hero-register-btn{
  display:inline-flex;align-items:center;justify-content:center;
  width:258px;height:60px;margin-top:46px;border-radius:999px;
  background:#0860f5;color:#fff;font-size:22px;font-weight:700;
  box-shadow:0 10px 26px rgba(8,96,245,.18);transition:.2s;
}
.hero-register-btn:hover{background:#004ed2;transform:translateY(-2px)}
.platform-bar-wrap{
  position:absolute;z-index:3;left:5%;right:5%;bottom:19.5%;
}
.platform-bar{
  min-height:170px;padding:18px 34px;
  display:grid;grid-template-columns:repeat(10,minmax(0,1fr));align-items:center;gap:12px;
  border:1px solid rgba(255,255,255,.62);border-radius:100px;
  background:rgba(255,255,255,.40);
  box-shadow:0 14px 36px rgba(30,49,71,.12);
  backdrop-filter:blur(13px);-webkit-backdrop-filter:blur(13px);
}
.platform-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;color:#fff;font-size:clamp(13px,1.35vw,25px);font-weight:500;text-shadow:0 1px 5px rgba(0,0,0,.22);white-space:nowrap}
.platform-icon{
  width:86px;height:86px;max-width:6vw;max-height:6vw;min-width:54px;min-height:54px;
  display:grid;place-items:center;border-radius:50%;background:#fff;
  color:#268de8;font-size:39px;font-weight:800;box-shadow:0 5px 18px rgba(0,0,0,.08);
}
.platform-icon.twitter{color:#42a5e9}.platform-icon.messenger{color:#8b50e8}
.platform-icon.line{background:#08c75b;color:#fff;font-size:18px}
.platform-icon.facebook{background:#1877ed;color:#fff;font-size:58px;align-items:end}
.platform-icon.whatsapp{background:#21bd55;color:#fff}
.platform-icon.instagram{color:#e64c91}
.platform-icon.slack{color:#20b8a2}
.platform-icon.telegram{background:#2ca9dc;color:#fff}
.platform-icon.skype{color:#1e9ddd}
.platform-icon.more{background:transparent;box-shadow:none;color:#fff;font-size:36px;letter-spacing:3px}
.telegram-float{
  position:absolute;right:0;top:36%;z-index:4;width:96px;height:80px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  background:#397cf0;color:#fff;border-radius:4px 0 0 4px;
  box-shadow:0 7px 20px rgba(24,88,190,.18)
}
.telegram-float span{font-size:31px;line-height:1}
.telegram-float small{font-size:12px;font-weight:700}
.hero-decoration{position:absolute;right:2%;bottom:-16px;z-index:1;display:flex;gap:7px;transform:rotate(-22deg)}
.hero-decoration i{display:block;width:42px;height:110px;border-radius:30px;background:linear-gradient(180deg,#54e3f4,#08a9ed);opacity:.85}
.hero-decoration i:nth-child(2){transform:translateY(26px) rotate(-22deg)}
.hero-decoration i:nth-child(3){transform:translateY(2px) rotate(22deg)}
@media(max-width:900px){
 .hero-home{height:720px;min-height:720px}
 .hero-home-content{padding-top:78px}
 .platform-bar-wrap{left:3%;right:3%;bottom:17%}
 .platform-bar{grid-template-columns:repeat(5,1fr);border-radius:28px;gap:16px;padding:18px}
 .platform-icon{max-width:none;max-height:none}
 .platform-item{font-size:14px}
 .telegram-float{top:auto;bottom:30%;width:76px;height:66px}
}
@media(max-width:600px){
 .hero-home{height:690px;min-height:690px}
 .hero-home-content{padding-top:62px}
 .hero-home h1{font-size:36px;letter-spacing:-1px}
 .hero-home-subtitle{font-size:14px;padding:0 8px}
 .hero-register-btn{width:190px;height:50px;font-size:18px;margin-top:28px}
 .platform-bar-wrap{bottom:12%;left:14px;right:14px}
 .platform-bar{grid-template-columns:repeat(5,minmax(0,1fr));gap:13px 4px;padding:16px 8px;border-radius:24px}
 .platform-icon{width:48px;height:48px;min-width:48px;min-height:48px;font-size:25px}
 .platform-icon.facebook{font-size:38px}
 .platform-item{font-size:11px;gap:4px}
 .platform-icon.more{font-size:23px}
 .telegram-float{width:60px;height:58px;bottom:35%;top:auto}
 .telegram-float span{font-size:23px}.telegram-float small{font-size:9px}
 .hero-bg-placeholder span{bottom:32%;font-size:10px;width:80%}
 .hero-decoration{display:none}
}


/* ==========================================
   Contact Page Specific Styles
   ========================================== */

/* ---------- Hero 区域 ---------- */
.contact-hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: url('../images/banner2.9e24157.png') center/cover no-repeat;
  background-color: #3a4a5a;
  overflow: hidden;
}

.contact-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  z-index: 1;
}

.contact-hero-content {
  position: relative;
  z-index: 2;
  padding: 0 24px;
  max-width: 900px;
}

.contact-hero-content h1 {
  color: #fff;
  font-size: clamp(32px, 5vw, 58px);
  font-weight: 800;
  letter-spacing: 3px;
  margin-bottom: 36px;
  line-height: 1.3;
  text-shadow: 0 3px 16px rgba(0, 0, 0, 0.35);
}

.btn-register {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 52px;
  background: #2b6bf3;
  color: #fff;
  font-size: 17px;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.2s;
  box-shadow: 0 6px 20px rgba(43, 107, 243, 0.35);
}

.btn-register:hover {
  background: #1c5ae0;
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(43, 107, 243, 0.45);
}

/* ---------- 悬浮 Telegram 客服 ---------- */
.telegram-side {
  position: fixed;
  right: 0;
  top: 40%;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 92px;
  padding: 12px 8px;
  background: #2b6bf3;
  color: #fff;
  border-radius: 8px 0 0 8px;
  box-shadow: 0 4px 20px rgba(43, 107, 243, 0.4);
  text-decoration: none;
  transition: background 0.2s;
}

.telegram-side:hover {
  background: #1c5ae0;
}

.telegram-side .tg-icon {
  font-size: 28px;
  line-height: 1;
  margin-bottom: 4px;
}

.telegram-side small {
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}

/* ---------- 合作资质 ---------- */
.cooperation-section {
  padding: 90px 0;
  background: #f7f9fc;
}

.section-title {
  text-align: center;
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 700;
  color: #17233b;
  margin-bottom: 52px;
  letter-spacing: 2px;
}

.coop-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
  max-width: 1040px;
  margin: 0 auto;
}

.coop-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fff;
  border-radius: 12px;
  padding: 34px 30px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  border: 1px solid #eef1f6;
  transition: transform 0.25s, box-shadow 0.25s;
}

.coop-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
}

.coop-text {
  flex: 1;
  padding-right: 24px;
}

.coop-text h3 {
  font-size: 19px;
  font-weight: 700;
  color: #17233b;
  margin-bottom: 10px;
}

.coop-text p {
  font-size: 14px;
  color: #69758b;
  line-height: 1.65;
  margin: 0;
}

.coop-icon {
  flex-shrink: 0;
  width: 76px;
  height: 76px;
  border-radius: 12px;
  overflow: hidden;
}

.coop-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 服务支持 ---------- */
.support-section {
  padding: 90px 0;
  background: #fff;
}

.qr-wrapper {
  display: flex;
  justify-content: center;
  gap: 100px;
  flex-wrap: wrap;
}

.qr-item {
  text-align: center;
}

.qr-item img {
  width: 190px;
  height: 190px;
  object-fit: contain;
  border-radius: 8px;
}

.qr-item p {
  margin-top: 18px;
  font-size: 15px;
  color: #17233b;
  font-weight: 500;
}

/* ---------- 底部 CTA ---------- */
.cta-section {
  padding: 90px 0;
  background: #1e64e8;
  text-align: center;
}

.cta-section h2 {
  color: #fff;
  font-size: clamp(24px, 3.5vw, 44px);
  font-weight: 700;
  letter-spacing: 3px;
  margin-bottom: 36px;
  line-height: 1.45;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 52px;
  background: #fff;
  color: #1e64e8;
  font-size: 16px;
  font-weight: 600;
  border-radius: 999px;
  transition: all 0.2s;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.22);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .coop-grid {
    grid-template-columns: 1fr;
  }
  .qr-wrapper {
    gap: 60px;
  }
}

@media (max-width: 700px) {
  .contact-hero {
    min-height: 380px;
  }
  .contact-hero-content h1 {
    font-size: 28px;
    letter-spacing: 1px;
    margin-bottom: 24px;
  }
  .btn-register {
    padding: 12px 36px;
    font-size: 15px;
  }
  .coop-card {
    padding: 24px 20px;
  }
  .coop-icon {
    width: 60px;
    height: 60px;
  }
  .qr-item img {
    width: 150px;
    height: 150px;
  }
  .qr-wrapper {
    gap: 40px;
  }
  .telegram-side {
    top: auto;
    bottom: 120px;
    width: 78px;
    padding: 8px 4px;
  }
  .telegram-side .tg-icon {
    font-size: 22px;
  }
  .telegram-side small {
    font-size: 10px;
  }
  .cooperation-section,
  .support-section,
  .cta-section {
    padding: 60px 0;
  }
  .section-title {
    margin-bottom: 36px;
  }
  .cta-section h2 {
    letter-spacing: 1px;
  }
}