/* ═══════════════════════════════════════════════
   V1 — 数说故事风 · 白底蓝调 · 温暖科技
   ═══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;600;700;800&display=swap');

:root {
  --white: #FFFFFF;
  --canvas: #F5F7FA;
  --canvas-alt: #F9FAFB;
  --blue: #2B5CF5;
  --blue-dark: #1D4ED8;
  --blue-light: #EEF2FF;
  --blue-glow: rgba(43,92,245,.08);
  --coral: #F4694C;
  --coral-light: #FEF2F0;
  --text: #1A1A2E;
  --text-secondary: #6B7280;
  --text-muted: #9CA3AF;
  --border: #E5E7EB;
  --shadow-sm: 0 1px 2px rgba(26,26,46,.04);
  --shadow: 0 4px 12px rgba(26,26,46,.06);
  --shadow-md: 0 8px 24px rgba(26,26,46,.08);
  --shadow-lg: 0 16px 40px rgba(26,26,46,.1);
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --display: 'Inter','Noto Sans SC',sans-serif;
  --body: 'Noto Sans SC','PingFang SC','Microsoft YaHei','Inter',sans-serif;
  --max-w: 1600px;
  --section-gap: 5.5rem;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{
  font-family:var(--body);color:var(--text);background:var(--white);
  line-height:1.7;font-size:16px;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}
button{cursor:pointer;font:inherit;border:none;background:none}
input,select,textarea{font:inherit}
::selection{background:var(--blue-light);color:var(--blue)}
.container{width:min(var(--max-w),calc(100% - 2rem));margin:0 auto}

/* ── Navigation ── */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:.55rem 0;transition:all .3s;
}
.topbar.scrolled{
  background:rgba(255,255,255,.85);backdrop-filter:blur(16px) saturate(180%);
  padding:.4rem 0;border-bottom:1px solid var(--border);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:2rem}
.brand{display:flex;align-items:center;flex-shrink:0;background:rgba(255,255,255,.7);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);padding:.25rem .6rem;border-radius:var(--radius);border:1px solid rgba(255,255,255,.2)}
.brand-logo{width:270px;height:auto}
.menu{display:flex;align-items:center;gap:2px}
.menu a{
  padding:.5rem 1rem;border-radius:var(--radius);
  font-size:1.575rem;font-weight:500;color:var(--text-secondary);
  transition:all .2s;
}
.menu a:hover{color:var(--blue);background:var(--blue-light)}
.menu a.active{color:var(--blue);background:var(--blue-light)}
.nav-cta{display:flex;align-items:center;gap:.75rem;flex-shrink:0}
.phone{font-weight:600;font-size:1.32rem;color:var(--text);transition:color .2s}
.phone:hover{color:var(--blue)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px}
.hamburger span{width:22px;height:2px;background:var(--text);border-radius:2px}

/* ── Buttons ── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.6rem 1.4rem;border-radius:var(--radius);
  font-weight:600;font-size:.85rem;
  transition:all .25s;white-space:nowrap;
}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 4px 14px var(--blue-glow)}
.btn-primary:hover{background:var(--blue-dark);transform:translateY(-1px);box-shadow:0 6px 20px var(--blue-glow)}
.btn-outline{background:transparent;color:var(--blue);border:1.5px solid var(--blue)}
.btn-outline:hover{background:var(--blue);color:#fff}
.btn-coral{background:var(--coral);color:#fff}
.btn-coral:hover{background:#E05A3F;transform:translateY(-1px)}
.btn-lg{padding:.75rem 1.8rem;font-size:.92rem}

/* ── Hero ── */
.hero{
  min-height:100dvh;display:grid;align-items:center;
  background:linear-gradient(165deg, #F5F7FA 0%, #FFFFFF 50%, #FEF2F0 100%);
  padding:6rem 0 3rem;position:relative;overflow:hidden;
}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:4rem;align-items:center;position:relative;z-index:1}
.hero-badge{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.4rem 1rem;border-radius:999px;
  background:var(--blue-light);color:var(--blue);
  font-size:1.05rem;font-weight:600;margin-bottom:1.25rem;
}
.hero h1{
  font-family:var(--display);
  font-size:clamp(2.5rem,5vw,4.2rem);font-weight:800;
  line-height:1.08;letter-spacing:-.02em;color:var(--text);
}
.hero h1 .highlight{color:var(--blue)}
.hero h1 .highlight-warm{color:var(--coral)}
.hero p{
  font-size:clamp(.95rem,1.15vw,1.05rem);color:var(--text-secondary);
  line-height:1.85;margin:1.25rem 0 2rem;max-width:500px;
}
.hero-actions{display:flex;gap:.75rem;flex-wrap:wrap}

/* Hero Visual */
.hero-visual{position:relative;display:grid;place-items:center}
.hero-graphic{
  width:min(380px,100%);aspect-ratio:1;border-radius:50%;
  position:relative;
  background:radial-gradient(circle at 40% 40%, var(--blue-glow), transparent 60%);
}
.hero-graphic::before{
  content:'';position:absolute;inset:8%;border-radius:50%;
  border:1.5px dashed rgba(43,92,245,.15);
  animation:spin 30s linear infinite;
  filter:blur(1px);
}
.hero-graphic::after{
  content:'';position:absolute;inset:3%;border-radius:50%;
  border:2px solid rgba(43,92,245,.08);
  filter:blur(4px);
  pointer-events:none;
}
@keyframes spin{to{transform:rotate(360deg)}}
.hero-center{
  position:absolute;inset:11%;border-radius:50%;
  background:linear-gradient(135deg, var(--blue), var(--coral));
  display:grid;place-items:center;color:#fff;
  font-family:var(--display);font-size:clamp(2.25rem,3.75vw,3.75rem);font-weight:800;
  box-shadow:0 0 30px var(--blue-glow);
}
.hero-float{
  position:absolute;padding:.7rem 1.4rem;border-radius:var(--radius);
  background:rgba(255,255,255,.88);backdrop-filter:blur(8px);
  border:1px solid var(--border);
  font-size:1.875rem;font-weight:600;color:var(--text);
  box-shadow:var(--shadow);white-space:nowrap;
}
.hero-float:nth-child(2){top:-6%;right:0%;color:var(--blue)}
.hero-float:nth-child(3){top:35%;right:-18%;color:var(--coral)}
.hero-float:nth-child(4){bottom:-6%;right:0%;color:var(--blue)}
.hero-float:nth-child(5){bottom:35%;left:-18%;color:var(--coral)}

/* ── Stats ── */
.stats-bar{
  display:grid;grid-template-columns:repeat(6,1fr);
  padding:2rem 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);
}
.stat-item{text-align:center;border-right:1px solid var(--border);padding:0 1rem}
.stat-item:last-child{border-right:none}
.stat-item strong{display:block;font-family:var(--display);font-size:1.7rem;font-weight:800;color:var(--blue);line-height:1.2}
.stat-item small{font-size:.78rem;color:var(--text-muted);font-weight:500}

/* ── Platforms ── */
.platforms-strip{
  display:flex;gap:1rem;align-items:center;justify-content:center;
  padding:1.25rem 0;overflow-x:auto;scrollbar-width:none;
  flex-wrap:wrap;
}
.platforms-strip::-webkit-scrollbar{display:none}
.platforms-strip .label{
  font-size:1rem;font-weight:700;text-transform:uppercase;letter-spacing:.12em;
  color:var(--coral);flex-shrink:0;
  background:var(--coral-light);padding:.6rem 1.2rem;border-radius:999px;
  border:1px solid rgba(244,105,76,.2);
}
.platforms-strip span{
  font-size:1.64rem;white-space:nowrap;
  padding:.6rem 1.7rem;border-radius:999px;
  flex-shrink:0;font-weight:500;
  background:var(--canvas);border:1px solid var(--border);
}
.platforms-strip span:nth-child(odd):not(.label){
  color:var(--blue);
}
.platforms-strip span:nth-child(even){
  color:var(--text-secondary);
}

/* ── Sections ── */
section{padding:var(--section-gap) 0}
.section-alt{background:var(--canvas)}
.section-header{margin-bottom:3rem}
.section-header.centered{text-align:center;max-width:680px;margin-left:auto;margin-right:auto}
.section-label{
  font-family:var(--display);font-size:1.1rem;font-weight:700;
  text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:.65rem;display:block;
}
.section-header h2{
  font-family:var(--display);
  font-size:clamp(1.8rem,3vw,2.8rem);font-weight:700;
  letter-spacing:-.02em;line-height:1.15;color:var(--text);
}
.section-header h2 .highlight{color:var(--blue)}
.section-header p{color:var(--text-secondary);margin-top:.65rem;font-size:.95rem;line-height:1.8}

/* ── Service Cards ── */
.service-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
.service-card{
  padding:2.25rem;border-radius:var(--radius-xl);
  background:var(--white);border:1px solid var(--border);
  box-shadow:var(--shadow-sm);transition:all .3s;
}
.service-card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px);border-color:var(--blue)}
.service-card .icon{
  width:2.6rem;height:2.6rem;border-radius:var(--radius);
  background:var(--blue-light);color:var(--blue);
  display:grid;place-items:center;font-size:1.15rem;font-weight:700;margin-bottom:1rem;
}
.service-card h3{font-size:1.2rem;font-weight:700;margin-bottom:.4rem}
.service-card p{color:var(--text-secondary);font-size:.85rem;line-height:1.7}
.service-subs{display:grid;grid-template-columns:1fr 1fr;gap:.6rem;margin-top:1rem}
.service-sub{padding:.9rem 1.1rem;border-radius:var(--radius);background:var(--canvas);font-size:1rem}
.service-sub h4{font-weight:600;font-size:1.15rem;margin-bottom:.2rem}
.service-sub p{color:var(--text-secondary);font-size:.95rem;margin:0}

/* ── Industry Grid ── */
.industry-grid{
  display:flex;flex-direction:column;gap:2rem;
}
.industry-group{
  display:flex;flex-direction:row;align-items:center;gap:0;
}
.industry-group .section-label{
  margin-left:200px;margin-right:1.5rem;margin-bottom:0;
  font-size:2.2rem;flex-shrink:0;
}
.industry-row{
  display:flex;flex-wrap:wrap;gap:1.25rem;justify-content:center;flex:1;
}
.industry-card{
  padding:2rem 2.5rem;border-radius:var(--radius-lg);
  background:#ffffff;border:2px solid #e5e7eb;
  box-shadow:0 4px 12px rgba(0,0,0,.06);
  text-align:center;flex:0 0 auto;width:300px;
  transition:transform .3s,box-shadow .3s;
}
.industry-card:hover{
  box-shadow:0 30px 60px rgba(0,0,0,.18);
  transform:scale(1.1) translateY(-14px);
}
.industry-card h4{font-weight:700;font-size:1.8rem;margin-bottom:.5rem;color:var(--text)}
.industry-card p{color:var(--text-secondary);font-size:1.5rem;line-height:1.4}

/* ── Cases ── */
.cases-scroll{
  display:flex;gap:1rem;overflow-x:auto;
  padding-bottom:.75rem;scrollbar-width:thin;
  -webkit-overflow-scrolling:touch;
}
.cases-scroll::-webkit-scrollbar{height:6px}
.cases-scroll::-webkit-scrollbar-track{background:var(--canvas);border-radius:3px}
.cases-scroll::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
.cases-scroll::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}
.cases-scroll .case-card{
  flex:0 0 calc(50% - .5rem);min-width:360px;
}
.case-card{
  padding:2rem;border-radius:var(--radius-xl);
  background:var(--white);border:1px solid var(--border);
  box-shadow:var(--shadow-sm);transition:all .3s;
}
.case-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}
.case-card h3{font-size:1.25rem;font-weight:700;margin-bottom:.4rem;color:var(--text)}
.case-card .tag{
  display:inline-block;font-size:1rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;
  padding:.35rem .9rem;border-radius:999px;background:var(--blue-light);color:var(--blue);margin-bottom:.7rem;
}
.case-card p{color:var(--text-secondary);font-size:1.5rem;line-height:1.5}
.case-card.accent-border{border-color:rgba(244,105,76,.2)}

.case-row{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
.case-card .metric{display:flex;justify-content:space-between;align-items:center;padding:.55rem 0;border-bottom:1px solid var(--border)}
.case-card .metric:last-child{border:none}
.case-card .metric .l{color:var(--text-secondary);font-weight:500;font-size:1.28rem}
.case-card .metric .v{font-weight:700;color:var(--blue);font-size:1.05rem;white-space:nowrap}

.case-card .metric-compare{display:flex;flex-direction:column;align-items:flex-start;gap:.1rem;padding:.55rem 0;border-bottom:1px solid var(--border)}
.case-card .metric-compare:last-child{border:none}
.case-card .metric-compare .l{color:var(--text-secondary);font-weight:500;font-size:1.28rem}
.case-card .metric-compare .before{font-size:1.05rem;color:var(--text-muted)}
.case-card .metric-compare .v{font-weight:700;color:var(--coral);font-size:1.35rem}

.case-card .metric-col{display:flex;flex-direction:column;align-items:flex-end;gap:.1rem;padding:.55rem 0;border-bottom:1px solid var(--border);text-align:right}
.case-card .metric-col:last-child{border:none}
.case-card .metric-col .l{color:var(--text-secondary);font-weight:500;font-size:1.28rem}
.case-card .metric-col .v{font-weight:700;color:var(--blue);font-size:1.35rem}
.case-card .metric-hl{grid-column:1/3;margin-top:.25rem;text-align:center;padding:.65rem;border-radius:var(--radius);background:var(--canvas);font-size:.9rem;font-weight:600;color:var(--text);margin-bottom:0;border:none}

/* ── Insights ── */
.insights-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:1.25rem;align-items:start}
.insight-list{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.insight-card{
  padding:1.4rem;border-radius:var(--radius-xl);
  background:var(--white);border:1px solid var(--border);box-shadow:var(--shadow-sm);transition:all .3s;
}
.insight-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}
.insight-card .date{font-size:.7rem;color:var(--text-muted);font-weight:500}
.insight-card h4{font-size:.9rem;font-weight:600;margin:.4rem 0 .25rem;line-height:1.35}
.insight-card p{color:var(--text-secondary);font-size:.78rem;line-height:1.6}
.qa-stack{display:grid;gap:.6rem}
.qa-card{
  padding:1.1rem 1.3rem;border-radius:var(--radius);
  border-left:3px solid var(--coral);
  background:var(--white);border-top:1px solid var(--border);border-right:1px solid var(--border);border-bottom:1px solid var(--border);
}
.qa-card strong{display:block;font-size:.85rem;font-weight:600;margin-bottom:.25rem;color:var(--text)}
.qa-card p{color:var(--text-secondary);font-size:.78rem;margin:0}

/* ── FAQ ── */
.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:.65rem}
.faq-item{
  padding:1.2rem 1.4rem;border-radius:var(--radius-lg);
  background:var(--white);border:1px solid var(--border);transition:all .25s;
}
.faq-item:hover{border-color:var(--blue)}
.faq-item strong{display:block;font-size:.85rem;font-weight:600;margin-bottom:.25rem}
.faq-item p{color:var(--text-secondary);font-size:.78rem;margin:0}

/* ── About ── */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:start}
.about-card{padding:2.25rem;border-radius:var(--radius-xl);background:var(--white);border:1px solid var(--border);box-shadow:var(--shadow-sm)}
.about-card h3{font-size:1.25rem;font-weight:700;margin-bottom:.75rem}
.about-card p{color:var(--text-secondary);font-size:.85rem;line-height:1.75;margin-bottom:.3rem}
.contact-row{display:grid;gap:.5rem;margin-top:1rem}
.contact-row .item{
  display:flex;gap:.65rem;align-items:flex-start;
  padding:.6rem .9rem;border-radius:var(--radius);background:var(--canvas);
  font-size:.8rem;
}
.contact-row .item strong{display:block;font-size:.65rem;color:var(--text-muted);font-weight:600;text-transform:uppercase;letter-spacing:.06em;margin-bottom:.1rem}
.qr-box{
  display:flex;gap:1rem;align-items:center;margin-top:.75rem;
  padding:.8rem 1.1rem;border-radius:var(--radius);background:var(--canvas);
}
.qr-box img{width:90px;height:90px;border-radius:var(--radius);object-fit:contain;background:#fff;padding:4px}
.qr-box p{font-size:.78rem;color:var(--text-secondary);margin:0}

/* ── Form ── */
.form-card{padding:2.25rem;border-radius:var(--radius-xl);background:var(--white);border:1px solid var(--border);box-shadow:var(--shadow-sm)}
.form-card h3{font-size:1.25rem;font-weight:700;margin-bottom:1rem}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}
.form-grid input,.form-grid select,.form-grid textarea{
  width:100%;padding:.6rem .9rem;border:1px solid var(--border);border-radius:var(--radius);
  background:var(--canvas);font-size:.85rem;color:var(--text);transition:all .2s;
}
.form-grid input::placeholder,.form-grid textarea::placeholder{color:var(--text-muted)}
.form-grid select option{background:var(--white);color:var(--text)}
.form-grid input:focus,.form-grid select:focus,.form-grid textarea:focus{
  outline:none;border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-glow);
}
.form-grid textarea{grid-column:1/-1;min-height:90px;resize:vertical}
.form-grid .btn{grid-column:1/-1;margin-top:.15rem}

/* ── 侧边悬浮联系方式 ── */
.side-contact{
  position:fixed;right:1.25rem;top:66.66%;transform:translateY(-50%);
  z-index:80;display:flex;flex-direction:column;gap:.75rem;align-items:center;
}
.sc-phone{
  background:var(--blue);color:#fff;border-radius:999px;
  padding:.75rem 1.2rem;font-weight:700;font-size:1.05rem;
  box-shadow:0 10px 24px rgba(43,92,245,.3);white-space:nowrap;
  transition:background .3s;
}
.sc-phone:hover{background:var(--blue-dark)}
.sc-wechat{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:.6rem;box-shadow:var(--shadow-md);text-align:center;width:148px;
}
.sc-wechat img{width:124px;height:124px;object-fit:cover;border-radius:8px}
.sc-wechat span{display:block;margin-top:.35rem;font-size:.85rem;color:var(--text-secondary);font-weight:600}
@media(max-width:620px){.side-contact{display:none}}

/* ── Footer ── */
.footer{background:var(--text);color:rgba(255,255,255,.65);padding:3.5rem 0 1.5rem;margin-top:var(--section-gap)}
.footer-grid{display:grid;grid-template-columns:1.5fr repeat(4,1fr);gap:2rem}
.footer h3{color:#fff;font-size:1.575rem;font-weight:700;margin-bottom:.65rem}
.footer h4{font-size:1.08rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:rgba(255,255,255,.35);margin-bottom:.6rem}
.footer a,.footer p{display:block;color:rgba(255,255,255,.5);font-size:1.17rem;margin:.25rem 0;transition:color .2s}
.footer a:hover{color:var(--blue)}
.copyright{border-top:1px solid rgba(255,255,255,.08);margin-top:2rem;padding-top:1.25rem;text-align:center;font-size:1.08rem;color:rgba(255,255,255,.3)}

/* ── GSAP ── */
.gsap-up{opacity:0;transform:translateY(25px)}
.gsap-side{opacity:0;transform:translateX(-25px)}

/* ── Back to Top ── */
.back-top{position:fixed;bottom:2rem;right:2rem;z-index:99;width:48px;height:48px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.3rem;box-shadow:0 4px 14px var(--blue-glow);cursor:pointer;opacity:0;visibility:hidden;transform:translateY(10px);transition:all .3s;border:none}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{background:var(--blue-dark);transform:translateY(-2px)}

/* ── Responsive ── */
@media(max-width:960px){
  .hamburger{display:flex}
  .menu{display:none;position:fixed;inset:0;background:var(--white);flex-direction:column;justify-content:center;align-items:center;z-index:99}
  .menu.open{display:flex}
  .menu a{font-size:1.1rem;padding:.7rem 2rem}
  .nav-cta .btn{display:none}
  .hero-grid{grid-template-columns:1fr;gap:2rem}
  .hero-visual{display:none}
  .service-grid,.about-grid,.insights-grid{grid-template-columns:1fr}
  .cases-grid{grid-template-columns:1fr}
  .cases-grid .wide{grid-template-columns:1fr}
  .faq-grid,.insight-list{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .form-grid{grid-template-columns:1fr}
}
@media(max-width:620px){
  .container{width:calc(100% - 1.25rem)}
  :root{--section-gap:3.5rem}
  .stats-bar{grid-template-columns:repeat(3,1fr);gap:1rem}
  .stat-item:nth-child(3){border-right:none}
  .stat-item:nth-child(4){border-right:none}
  .stat-item strong{font-size:1.3rem}
    .industry-group{flex-direction:column;align-items:center}
    .industry-group .section-label{margin-left:0;margin-right:0;margin-bottom:.5rem}
    .industry-row{flex-direction:column;align-items:center}
  .service-subs{grid-template-columns:1fr}
  .phone{display:none}
  .footer-grid{grid-template-columns:1fr}
}
.yc-toast{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);background:rgba(17,24,39,.93);color:#fff;padding:16px 28px;border-radius:12px;font-size:15px;line-height:1.6;z-index:99999;max-width:82%;text-align:center;box-shadow:0 10px 40px rgba(0,0,0,.3);opacity:0;transition:opacity .3s ease;pointer-events:none}.yc-toast.show{opacity:1}