hesu-JT/css/about-us-v3.css

/* ============================================================
   About Us V3 — NIO-style trigger animations
   内容与 about-us.html 完全一致。
   动效:滚动到达阈值 → JS 加 .play → CSS transition 自动播完。
   ============================================================ */

/* ---------- 钉屏(与 about-us.css 相同) ---------- */
.au-main { position: relative; z-index: 1; }
.site-footer { position: relative; z-index: 3; }
.au-pin { position: relative; height: 300vh; }
.au-screen { position: sticky; top: 0; height: 100vh; overflow: hidden; }
#au-1 { z-index: 1; }
#au-3 { z-index: 2; }

/* ---------- au-1 元素 ---------- */
.au-bg { position: absolute; inset: 0; z-index: 0; background-size: cover; background-position: center; }
.au-bg::after { content: ""; position: absolute; inset: 0; background: rgba(1,15,30,0.30); }
.au-corner-img { position: absolute; right: 0; bottom: 0; z-index: 2; height: auto; pointer-events: none; }
.au-inner {
  position: relative; z-index: 1; width: 100%; max-width: var(--container);
  margin: 60px auto 0; padding: var(--header-h) 32px; text-align: left; color: #fff;
}
.au-text { margin-left: 0; margin-right: auto; }
.au-title {
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(2rem, 5vw, 2.4rem); line-height: 1.1;
  color: #fff; margin-bottom: 26px; text-shadow: 0 2px 20px rgba(0,0,0,0.45);
}
.au-text {
  font-size: clamp(1rem, 1.4vw, 1.1rem); line-height: 1.85;
  color: rgba(255,255,255,0.92); max-width: 820px; text-shadow: 0 1px 12px rgba(0,0,0,0.4);
}
.au-mask { position: absolute; inset: 0; z-index: 3; background: rgba(1,15,30,0.55); opacity: 0; }
.au-slogan-layer {
  position: absolute; inset: 0; z-index: 4; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: var(--header-h) 32px; padding-top: 16vh;
  text-align: center; color: #fff;
}
.au-slogan {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(2.2rem, 6vw, 2.6rem); line-height: 1.1;
  color: #fff; text-shadow: 0 2px 24px rgba(0,0,0,0.5); margin-bottom: 24px;
}
.au-slogan-cn {
  font-size: clamp(1.2rem, 2.4vw, 2rem); letter-spacing: 0.3em;
  color: var(--orange-300); text-shadow: 0 1px 12px rgba(0,0,0,0.5);
}

/* ---------- au-3 元素 ---------- */
.au-zoom-img {
  position: absolute; left: 50%; top: 68%; width: min(711px, 82vw); height: min(560px, 58vh);
  transform: translate(-50%, -50%) scale(1); transform-origin: center;
  background-size: cover; background-position: center; z-index: 1;
  box-shadow: 0 24px 70px rgba(0,0,0,0.45);
}
.au-zoom-mask { position: absolute; inset: 0; z-index: 2; background: #000; opacity: 0; }
.au-sec-head {
  position: absolute; top: 0; left: 0; right: 0; z-index: 3;
  padding: calc(var(--header-h) + 56px) 32px 0; text-align: center; color: #fff;
}
.au-sec-title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2rem); line-height: 1.1;
  color: #202020; margin-bottom: 18px;
}
.au-sec-text {
  font-size: clamp(0.95rem, 1.3vw, 1rem); line-height: 1.8;
  color: #202020; max-width: 760px; margin: 0 auto;
}
.au-reveal {
  position: absolute; inset: 0; z-index: 4; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 32px; text-align: center; color: #fff; opacity: 0;
}
.au-logo-big { display: flex; align-items: center; justify-content: center; margin-bottom: 28px; }
.au-logo-big .logo-img { height: clamp(44px, 6vw, 76px); }
.au-reveal-text {
  font-size: clamp(1rem, 1.4vw, 1.15rem); line-height: 1.85;
  color: rgba(255,255,255,0.92); max-width: 720px;
}

/* ============================================================
   V3 核心:触发式动画(NIO 同款)
   初始态 → .play 加上后 → CSS transition 自动过渡到目标态
   ============================================================ */

/* ---- 初始态 = 反向时序(快速、无延迟) ---- */
.au-inner, .au-corner-img {
  opacity: 1;
  transition: opacity 0.25s ease;
}
.au-slogan {
  opacity: 0; transform: translate3d(0, 30px, 0);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.au-slogan-cn {
  opacity: 0; transform: translate3d(0, 30px, 0);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.au-mask { opacity: 0; will-change: opacity; }
.au-bg { transform: scale(1.04); will-change: transform; }
.au-sec-head {
  opacity: 1;
  transition: opacity 0.25s ease;
}
.au-zoom-mask { opacity: 0; will-change: opacity; }
.au-zoom-img {
  transform: translate(-50%, -50%) scale(1);
  transition: transform 0.4s cubic-bezier(0.22,1,0.36,1);
}
.au-logo-big {
  opacity: 0; transform: translate3d(0, 24px, 0);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.au-reveal-text {
  opacity: 0;
  transition: opacity 0.25s ease;
}
.au-reveal {
  opacity: 0;
  transition: opacity 0.25s ease;
}

/* ---- .play 触发态 = 正向时序(慢、有延迟、错峰) ---- */
#au-1.play .au-inner,
#au-1.play .au-corner-img {
  opacity: 0;
  transition: opacity 0.6s cubic-bezier(0.22,1,0.36,1);
}
#au-1.play .au-slogan {
  opacity: 1; transform: translate3d(0, 0, 0);
  transition: opacity 0.8s cubic-bezier(0.22,1,0.36,1) 0.3s,
              transform 0.8s cubic-bezier(0.22,1,0.36,1) 0.3s;
}
#au-1.play .au-slogan-cn {
  opacity: 1; transform: translate3d(0, 0, 0);
  transition: opacity 0.8s cubic-bezier(0.22,1,0.36,1) 0.45s,
              transform 0.8s cubic-bezier(0.22,1,0.36,1) 0.45s;
}

#au-3.play .au-sec-head {
  opacity: 0;
  transition: opacity 0.5s cubic-bezier(0.22,1,0.36,1);
}
#au-3.play .au-zoom-img {
  transform: translate(-50%, -50%) scale(3.5);
  transition: transform 1s cubic-bezier(0.65,0,0.35,1);
}
#au-3.play .au-logo-big {
  opacity: 1; transform: translate3d(0, 0, 0);
  transition: opacity 0.7s cubic-bezier(0.22,1,0.36,1) 0.7s,
              transform 0.7s cubic-bezier(0.22,1,0.36,1) 0.7s;
}
#au-3.play .au-reveal-text {
  opacity: 1;
  transition: opacity 0.7s cubic-bezier(0.22,1,0.36,1) 0.85s;
}
#au-3.play .au-reveal {
  opacity: 1;
  transition: opacity 0.6s cubic-bezier(0.22,1,0.36,1) 0.6s;
}

/* ============================================================
   GPS 区块(与 about-us.html 相同的视觉)
   ============================================================ */
.au-gps { background: #ffffff; padding: 120px 0; }
.au-gps__inner { max-width: 1400px; margin: 0 auto; padding: 0 40px; }
.au-gps__title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2rem,4vw,3rem); line-height: 1.1; color: #111;
  margin-bottom: 24px; text-align: center;
}
.au-gps__text {
  font-size: clamp(1rem,1.3vw,1.1rem); line-height: 1.8; color: #333;
  max-width: 900px; margin: 0 auto 60px; text-align: center;
}
.au-gps__cards { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
.au-gps__card-img { width: 100%; object-fit: cover; display: block; }
.au-gps__wide { max-width: 1000px; margin: 100px auto 0; padding: 0 40px; }
.au-gps__wide-img { width: 100%; display: block; }
.au-gps__wide-img:hover { transform: scale(1.04); transition: transform .5s var(--ease); }
.au-gps__split { display: grid; grid-template-columns: 1.7fr 1fr; gap: 32px; max-width: 1000px; margin: 100px auto 0; padding: 0 40px; }
.au-gps__data { display: flex; flex-direction: column; }
.au-gps__viewport { overflow: hidden; border-radius: 8px; cursor: grab; touch-action: pan-y; }
.au-gps__viewport.dragging { cursor: grabbing; }
.au-gps__track { display: flex; transition: transform .55s cubic-bezier(.22,1,.36,1); will-change: transform; }
.au-gps__data-card { flex: 0 0 100%; }
.au-gps__data-img { width: 100%; aspect-ratio: 16/10; border-radius: 8px; background-size: cover; background-position: center; }
.au-gps__data-body { padding: 16px 4px 0; }
.au-gps__data-body h4 { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; color: #111; margin-bottom: 8px; }
.au-gps__data-body p { font-size: .92rem; color: #555; line-height: 1.6; }
.au-gps__dots { display: flex; justify-content: flex-start; gap: 10px; margin-top: 20px; }
.au-gps__dots button { width: 28px; height: 3px; border: 0; border-radius: 2px; background: #d9dee6; cursor: pointer; padding: 0; transition: background .3s, width .3s; }
.au-gps__dots button.active { background: var(--orange-500); width: 44px; }
.au-gps__feature { position: relative; border-radius: 8px; overflow: hidden; min-height: 400px; }
.au-gps__feature-img { position: absolute; inset: 0; background: url(../image/about-us/right.jpg) center/cover no-repeat; display: flex; align-items: center; padding: 40px 44px; }
.au-gps__feature-title {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(1.6rem,2.6vw,2.2rem);
  background: linear-gradient(88.61deg,#FF6000 7.43%,#FFA557 98.82%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; margin-bottom: 18px;
}
.au-gps__feature-list { position: relative; border-left: 1px solid #fff; padding-left: 26px; }
.au-gps__feature-list p {
  font-family: var(--font-display); font-weight: 600; font-size: 1.05rem;
  color: #fff; line-height: 3.5; padding: 0; text-shadow: 0 1px 10px rgba(0,0,0,.45);
}
.au-gps__feature-list p + p { margin-top: 12px; }

/* ============================================================
   reduced-motion:解除钉屏,内容静态
   ============================================================ */
html.rm .au-pin { height: auto; }
html.rm .au-screen { position: relative; height: auto; min-height: 100vh; }
html.rm .au-bg, html.rm .au-inner, html.rm .au-corner-img, html.rm .au-mask,
html.rm .au-slogan, html.rm .au-slogan-cn, html.rm .au-sec-head,
html.rm .au-zoom-img, html.rm .au-zoom-mask, html.rm .au-reveal,
html.rm .au-logo-big, html.rm .au-reveal-text { transition: none !important; opacity: 1 !important; transform: none !important; }
html.rm .au-mask { opacity: .55 !important; }
html.rm .au-zoom-mask { opacity: 0 !important; }
html.rm .au-slogan-layer { position: relative; padding: 14vh 32px 10vh; }
html.rm .au-reveal { position: relative; padding: 12vh 32px 10vh; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 760px) {
  .au-gps { padding: 80px 0; }
  .au-gps__cards { grid-template-columns: 1fr 1fr; }
  .au-gps__split { grid-template-columns: 1fr; }
  .au-gps__wide, .au-gps__split { margin-top: 60px; }
  /* grid/flex children must shrink below content min-width, else the carousel
     track stretches the 1fr column past the viewport (same fix as about-us.css) */
  .au-gps__split > *, .au-gps__data, .au-gps__viewport { min-width: 0; max-width: 100%; }
}