/* ========== ROOT / RESET ========== */
:root{
  --bg:#07101a; --card:rgba(255,255,255,0.04);
  --accent:#00eaff; --accent-2:#7b4cff; --glass:rgba(255,255,255,0.04);
  --glass-2:rgba(0,212,255,0.06);
  --radius:18px; --max-w:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial; background:linear-gradient(180deg,var(--bg) 0%, #051018 100%); color:#e9f6ff; -webkit-font-smoothing:antialiased}
a{color:inherit}

/* ========== NAV ========== */
nav{width:120%;position:fixed;top:0;left: 150px;z-index:300;background:linear-gradient(180deg, rgba(2,8,12,0.55), rgba(2,8,12,0.15));backdrop-filter:blur(6px);border-bottom:5px solid rgba(255,255,255,0.03)}
.nav-wrap{max-width:var(--max-w);margin:0 auto;padding:14px 22px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:flex;align-items:center;gap:12px}
.brand img{height:45px;border-radius:10px;background:#fff;padding:3px}
.brand h1{font-size:20px;font-weight:700;color:#fff}
.nav-links{display:flex;gap:18px;align-items:center}
.nav-links a{padding:12px 12px;border-radius:10px;transition:all .18s ease;font-weight:600;color:rgba(255,255,255,0.85)}
.nav-links a.active, .nav-links a:hover{background:linear-gradient(90deg, rgba(0,212,255,0.06), rgba(123,76,255,0.04));box-shadow:0 6px 18px rgba(11,32,40,0.4);color:var(--accent)}
.cta-btn{background:linear-gradient(90deg,var(--accent),var(--accent-2));padding:8px 14px;border-radius:12px;color:#001820;font-weight:700}

/* ========== HERO (unique visual) ========== */
.hero{min-height:70vh;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;padding-top:150px;padding-bottom: 70px;}
.hero-inner{max-width:var(--max-w);width:100%;display:grid;grid-template-columns:1fr 420px;gap:40px;align-items:center}
.hero-left{padding:20px}
.kicker{display:inline-block;background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#001820;padding:6px 12px;border-radius:999px;font-weight:700;margin-bottom:18px}
.hero h2{font-size:2.6rem;line-height:1.02;margin-bottom:12px}
.hero p.lead{color:rgba(230,245,255,0.8);font-size:1.05rem;max-width:720px}
.hero-cta{margin-top:20px;display:flex;gap:12px}

/* canvas background (flow ribbons) */
#ribbon-canvas{position:absolute;right:-10%;top:-20%;width:1400px;height:1400px;pointer-events:none;mix-blend-mode:screen;opacity:.85}
.hero-card{background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));border-radius:16px;padding:18px;box-shadow:0 8px 30px rgba(3,12,20,0.6);backdrop-filter:blur(6px)}
.hero-card img{width:100%;height:300px;object-fit:cover;border-radius:10px}
.hero-meta{display:flex;gap:12px;align-items:center;margin-top:10px}

/* small responsive */
@media (max-width:980px){
  .hero-inner{grid-template-columns:1fr;}
  #ribbon-canvas{display:none}
}

/* ========== SECTIONS — each with unique layout ========== */
main{max-width:var(--max-w);margin:0 auto}

/* 1 — Overview Split (already different style) */
.section{padding:50px 22px}
.split{display:grid;grid-template-columns:600px 1fr;gap:32px;align-items:center}
.split .panel{background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));padding:18px;border-radius:14px}
.split video{width:100%;height:340px;object-fit:cover;border-radius:12px}
.split h3{font-size:1.6rem;margin-bottom:8px}
.split p{color:rgba(220,240,255,0.85);line-height:1.6}

@media (max-width:980px){.split{grid-template-columns:1fr}.split img{height:220px}}

/* 2 — Principles Carousel (horizontal scroll with large cards) */
.carousel-wrap{padding:18px 0}
.carousel{display:flex;gap:18px;overflow:auto;padding-bottom:10px}
.carousel::-webkit-scrollbar{height:8px}
.carousel::-webkit-scrollbar-thumb{background:linear-gradient(90deg,var(--accent),var(--accent-2));border-radius:8px}
.pcard{min-width:360px;background:linear-gradient(180deg, rgba(10,20,30,0.45), rgba(5,8,12,0.45));padding:22px;border-radius:16px;box-shadow:0 12px 40px rgba(8,20,30,0.6);position:relative;overflow:hidden}
.pcard h4{font-size:1.2rem;margin-bottom:8px}
.pcard p{color:rgba(200,230,255,0.85)}

.pcard .img-slot{
  height:240px;
  border-radius:12px;
  overflow:hidden;
  margin-top:12px;
  background:#fff; /* or any background color you prefer */
  display:flex;
  justify-content:center;
  align-items:center;
}

.pcard .img-slot img{
  width:100%;
  height:100%;
  object-fit:contain; /* show the full image without cropping */
  transform:none;
  transition:transform .6s;
}

.pcard:hover .img-slot img{
  transform:scale(1.05);
}


/* ===== ADVANTAGES FLOATING CARDS ===== */

/* ===== ADVANTAGES FLOATING CARDS ===== */
.adv-float-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:28px;
  margin-top:28px;
  perspective:1000px;
}
.adv-float-card{
  background:linear-gradient(180deg, rgba(0,12,20,0.45), rgba(0,8,12,0.55));
  border-radius:18px;
  padding:22px;
  text-align:center;
  box-shadow:0 12px 40px rgba(0,12,40,0.5);
  transition:transform .3s ease, box-shadow .3s ease;
  position:relative;
  overflow:hidden;
  cursor:default;
}
.adv-float-card::before{
  content:'';
  position:absolute;
  top:-50%; left:-50%;
  width:200%; height:200%;
  background:radial-gradient(circle at center, rgba(0,212,255,0.12), transparent 60%);
  transform:rotate(45deg);
  pointer-events:none;
}
.adv-float-card:hover{
  transform:translateY(-10px) rotateX(3deg) rotateY(3deg);
  box-shadow:0 20px 60px rgba(0,32,60,0.65);
}
.adv-float-card .icon{
  font-size:36px;
  color:var(--accent);
  margin-bottom:14px;
  transition:transform .3s ease;
}
.adv-float-card:hover .icon{transform:scale(1.2) rotate(-10deg)}
.adv-float-card h4{
  font-size:1.3rem;
  margin-bottom:10px;
}
.adv-float-card p{
  font-size:1rem;
  color:rgba(200,230,255,0.85);
  line-height:1.5;
}

/* Responsive */
@media (max-width:980px){.adv-float-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.adv-float-grid{grid-template-columns:1fr}}




/* 3 — Interactive Diagram (hover hotspots) */
.diagram{display:flex;gap:28px;flex-wrap:wrap;align-items:flex-start}
.diagram .schem{flex:1;min-width:320px;background:var(--card);padding:16px;border-radius:14px;position:relative}
.diagram img{padding-left:0px;height:550px;width:100%;overflow:hidden;display:block;  justify-content:center;
  align-items:center;}
.hotspot{position:absolute;width:14px;height:14px;border-radius:50%;background:var(--accent);box-shadow:0 4px 18px rgba(0,212,255,0.25);transform:translate(-50%,-50%);cursor:pointer}
.tip{position:absolute;background:linear-gradient(180deg, rgba(0,20,30,0.9), rgba(0,10,15,0.95));padding:10px;border-radius:10px;border:1px solid rgba(255,255,255,0.03);min-width:200px;display:none}

/* 小图 hover 动效 */
.diagram .panel img {
  transition: transform .35s ease, filter .35s ease;
  cursor: pointer;
}
.diagram .panel img:hover {
  transform: scale(1.08);
  filter: brightness(1.15);
}

/* 小图轻微浮动 */
@keyframes floatThumb {
  0% {transform: translateY(0);}
  50% {transform: translateY(-4px);}
  100% {transform: translateY(0);}
}
.diagram .panel img {
  animation: floatThumb 4s ease-in-out infinite;
}
.diagram .panel img:nth-child(2) {
  animation-delay: .8s;
}
.diagram .panel img:nth-child(3) {
  animation-delay: 1.6s;
}

/* 高亮态 (用于 hotspot 联动) */
.thumb-active {
  transform: scale(1.12) !important;
  filter: brightness(1.25) !important;
  box-shadow: 0 0 12px rgba(0,255,255,0.4);
}


.main-thumb-display {
  width:60%;
  height:200px;
  border-radius:12px;
  overflow:hidden;
  margin-bottom:12px;
  background:rgba(255,255,255,0.05);
  border:1px solid rgba(255,255,255,0.05);
  display:flex;
  align-items:center;
  justify-content:center;
  backdrop-filter:blur(6px);
}

.main-thumb-display img {
  width:80%;
  height:80%;
  object-fit:cover;
  transition:transform .45s ease, opacity .45s ease;
}

/* 你的小图继续保持动画 */
.thumb {
  width:78px;
  height:56px;
  object-fit:cover;
  border-radius:8px;
  transition:transform .35s ease, filter .35s ease;
  animation:floatThumb 4s ease-in-out infinite;
}
.thumb:nth-child(2){animation-delay:.8s}
.thumb:nth-child(3){animation-delay:1.6s}

.thumb:hover {
  transform:scale(1.1);
  filter:brightness(1.2);
}

/* 和热点联动 */
.thumb-active {
  transform:scale(1.15) !important;
  filter:brightness(1.3) !important;
  box-shadow:0 0 12px rgba(0,255,255,0.45);
}


/* 4 — Applications Grid (masonry-like) */
.apps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.app-card{background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.02));border-radius:14px;overflow:hidden;position:relative;padding-bottom:14px}
.app-card img{width:100%;height:300px;object-fit:cover}
.app-card .body{padding:14px}
.app-card h4{margin-bottom:15px}
.app-card p{margin-bottom:7px}
.badge{position:absolute;left:14px;top:14px;background:linear-gradient(90deg,var(--accent),var(--accent-2));padding:6px 10px;border-radius:8px;font-weight:700;color:#002126}

@media (max-width:980px){.apps{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.apps{grid-template-columns:1fr}.nav-links{display:none}}

/* Case study card hover animation */
.app-card {
  transition: transform .4s ease, box-shadow .4s ease;
  cursor: pointer;
  transform-style: preserve-3d;
  will-change: transform;
}

.app-card:hover {
  transform: translateY(-8px) scale(1.03);
  box-shadow: 0 18px 32px rgba(0, 255, 255, 0.18);
}


/* Image float animation */
.app-card img {
  transition: transform .5s ease;
}

.app-card:hover img {
  transform: scale(1.06);
}

/* Badge subtle pulse */
.badge {
  animation: pulseBadge 2s ease-in-out infinite;
}

@keyframes pulseBadge {
  0% { transform: scale(1) }
  50% { transform: scale(1.07) }
  100% { transform: scale(1) }
}

/* Fade-up load animation */
.app-card {
  opacity: 0;
  animation: fadeUp .8s ease forwards;
}
.app-card:nth-child(1){ animation-delay:.15s }
.app-card:nth-child(2){ animation-delay:.3s }
.app-card:nth-child(3){ animation-delay:.45s }

@keyframes fadeUp {
  0% { opacity:0; transform: translateY(20px) }
  100% { opacity:1; transform: translateY(0) }
}


/* 5 — Footer */
footer{padding:34px 22px;text-align:center;color:rgba(220,240,255,0.6);border-top:1px solid rgba(255,255,255,0.02);margin-top:30px}

/* Tiny animations */
.fade-up{opacity:0;transform:translateY(10px);animation:fadeUp .8s forwards}
@keyframes fadeUp{to{opacity:1;transform:none}}