/* 品牌跑马灯段 */
.brand {
  position: relative;
  height: 220vh;
  background: var(--bg-deep);
}

.brand__sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
}

.brand__barrage {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 34px;
  overflow: hidden;
  z-index: 1;
}

.brand__barrage-line {
  display: flex;
  gap: 48px;
  white-space: nowrap;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  will-change: transform;
}

.brand__barrage-line span {
  flex-shrink: 0;
}

.brand__barrage-line--1 {
  font-size: clamp(2.4rem, 3.5vw, 4.4rem);
  opacity: 0.22;
}

.brand__barrage-line--2 {
  font-size: clamp(1.6rem, 2.4vw, 2.8rem);
  opacity: 0.42;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.brand__barrage-line--3 {
  font-size: clamp(3rem, 5vw, 6rem);
  opacity: 0.75;
}

.brand__center {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  will-change: transform, filter;
}

.brand__logo-img {
  width: min(460px, 62vw);
  height: auto;
  content: var(--logo-src);
  filter: drop-shadow(0 18px 44px rgba(0, 0, 0, 0.3));
}

.brand__viewfinder {
  position: absolute;
  inset: 0;
  margin: auto;
  width: min(560px, 72vw);
  height: 170px;
  opacity: 0;
  pointer-events: none;
}

.vf {
  position: absolute;
  width: 26px;
  height: 26px;
  border-color: var(--accent);
  border-style: solid;
}

.vf--tl { border-width: 2px 0 0 2px; top: 0; left: 0; }
.vf--tr { border-width: 2px 2px 0 0; top: 0; right: 0; }
.vf--bl { border-width: 0 0 2px 2px; bottom: 0; left: 0; }
.vf--br { border-width: 0 2px 2px 0; bottom: 0; right: 0; }

.brand__mask {
  position: fixed;
  top: 50%;
  left: 50%;
  width: 250vmax;
  height: 250vmax;
  background: var(--bg);
  border-radius: 0;
  transform: translate(-50%, -50%) scale(0);
  opacity: 0;
  pointer-events: none;
  will-change: transform, opacity;
  z-index: 8;
}

/* 产品简介段 */
.intro {
  position: relative;
  padding-block: 140px 160px;
  background: var(--bg);
  overflow-x: clip;
}

.intro__grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(48px, 6vw, 90px);
  align-items: start;
}

.intro__lead {
  position: sticky;
  top: 140px;
}

.intro__title {
  font-size: var(--fs-3xl);
  font-weight: 800;
  line-height: var(--lh-tight);
}

.intro__points {
  display: flex;
  flex-direction: column;
  gap: 46px;
}

.intro__point {
  position: relative;
  padding: 30px 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.intro__point-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
}

.intro__point h3 {
  font-size: var(--fs-xl);
  font-weight: 700;
  margin-bottom: 10px;
}

.intro__point p {
  color: var(--text-2);
  font-size: var(--fs-base);
}