/* ============================================================
   PLAN — Sections：Hero / xu 产品区 / Philosophy / Future
   ============================================================ */

/* ---------- Hero ---------- */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: calc(100vh - var(--nav-h));
  min-height: calc(100svh - var(--nav-h));
  overflow: clip;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(560px 300px at 50% 8%, var(--glow), transparent 70%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-block: clamp(80px, 12vh, 120px);
}
.hero-title {
  font-size: clamp(64px, 13vw, 160px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: 0.02em;
}
.hero-tagline {
  margin-top: clamp(22px, 3vw, 32px);
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 500;
  letter-spacing: 0.04em;
}
.hero-intro {
  margin-top: 20px;
  font-size: 15.5px;
  line-height: 2;
  color: var(--text-2);
}
.hero-en {
  margin-top: 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-3);
}
.hero-actions {
  margin-top: clamp(36px, 5vh, 48px);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

/* 底部滚动提示 */
.hero-scroll {
  position: absolute;
  bottom: 26px;
  left: 50%;
  width: 1px;
  height: 46px;
  margin-left: -0.5px;
  background: linear-gradient(to bottom, var(--border-strong), transparent);
  overflow: hidden;
}
.hero-scroll::after {
  content: "";
  position: absolute;
  top: 0;
  left: -1px;
  width: 3px;
  height: 10px;
  border-radius: 3px;
  background: var(--text-3);
  animation: scroll-dot 2.6s var(--ease) infinite;
}
@keyframes scroll-dot {
  0% {
    transform: translateY(-12px);
    opacity: 0;
  }
  25% {
    opacity: 1;
  }
  100% {
    transform: translateY(50px);
    opacity: 0;
  }
}

@media (max-width: 640px) {
  .br-desktop {
    display: none;
  }
  .hero-scroll {
    display: none;
  }
}

/* ---------- xu 产品区 ---------- */

.product {
  padding-block: clamp(72px, 10vw, 120px) clamp(96px, 13vw, 160px);
}
.product-card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  background: var(--surface);
  padding: clamp(56px, 9vw, 104px) clamp(24px, 6vw, 72px) clamp(48px, 7vw, 80px);
  text-align: center;
  overflow: clip;
  transition: transform 0.6s var(--ease), box-shadow 0.6s var(--ease),
    background-color 0.45s ease, border-color 0.45s ease;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.product-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 320px;
  background: radial-gradient(480px 240px at 50% 0%, var(--glow), transparent 70%);
  pointer-events: none;
}
.product-card > * {
  position: relative;
}
.product-name {
  margin-top: 20px;
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(88px, 15vw, 172px);
  line-height: 1;
  letter-spacing: -0.01em;
}
.product-tagline {
  margin-top: clamp(24px, 3.5vw, 36px);
  font-size: clamp(20px, 3vw, 27px);
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: 0.02em;
}
.product-sub {
  margin-top: 14px;
  font-size: 15.5px;
  color: var(--text-2);
}
.product-cta {
  margin-top: clamp(32px, 4.5vw, 44px);
}
.product-timeline {
  max-width: 660px;
  margin: clamp(48px, 7vw, 72px) auto 0;
}

/* 抽象时间线：过去（实点）→ 现在（品牌色圆环）→ 未来（空心） */

.tl {
  width: 100%;
  height: auto;
  color: var(--text-3);
}
.tl-past {
  fill: var(--text-3);
  opacity: 0.5;
}
.tl-now-ring {
  fill: var(--surface);
  stroke: var(--accent);
  stroke-width: 1.5;
}
.tl-now-dot {
  fill: var(--accent);
}
.tl-future {
  fill: var(--surface);
  stroke: var(--border-strong);
  stroke-width: 1.5;
}
.tl-label {
  fill: var(--text-3);
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.25em;
}
.tl-line {
  transform-box: fill-box;
  transform-origin: center;
}

.js .tl-line {
  transform: scaleX(0);
}
.js .tl-node,
.js .tl-label {
  opacity: 0;
}
.js .tl-node {
  transform: scale(0.4);
  transform-box: fill-box;
  transform-origin: center;
  transition: opacity 0.55s ease, transform 0.55s var(--ease);
}
.js .tl-label {
  transition: opacity 0.6s ease;
}
.js .product-card.is-in .tl-line {
  transform: scaleX(1);
  transition: transform 1.2s 0.15s var(--ease);
}
.js .product-card.is-in .tl-node {
  opacity: 1;
  transform: scale(1);
}
.js .product-card.is-in .tl-label {
  opacity: 1;
  transition-delay: 1.05s;
}
.js .product-card.is-in circle:nth-of-type(1) {
  transition-delay: 0.45s;
}
.js .product-card.is-in circle:nth-of-type(2) {
  transition-delay: 0.55s;
}
.js .product-card.is-in circle:nth-of-type(3) {
  transition-delay: 0.65s;
}
.js .product-card.is-in circle:nth-of-type(4) {
  transition-delay: 0.71s;
}
.js .product-card.is-in circle:nth-of-type(5) {
  transition-delay: 0.8s;
}
.js .product-card.is-in circle:nth-of-type(6) {
  transition-delay: 0.9s;
}

/* ---------- Plan Philosophy ---------- */

.philosophy {
  padding-block: clamp(96px, 13vw, 170px);
}
.philosophy-en {
  font-size: clamp(38px, 6.6vw, 86px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.01em;
  text-transform: uppercase;
}
.philosophy-en span {
  display: block;
}
.philosophy-en .dim {
  color: var(--text-3);
}
.philosophy-zh {
  margin-top: clamp(36px, 5.5vw, 60px);
  font-size: clamp(17px, 2.3vw, 21px);
  line-height: 2.1;
  letter-spacing: 0.02em;
  color: var(--text-2);
}
.philosophy-zh strong {
  font-weight: 500;
  color: var(--text);
}

@media (max-width: 380px) {
  .philosophy-en {
    font-size: 30px;
  }
}

/* ---------- Future ---------- */

.future {
  padding-block: 0 clamp(120px, 16vw, 200px);
}
.future-title {
  margin-top: 18px;
  font-size: clamp(30px, 4.6vw, 54px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.01em;
}
.future-note {
  margin-top: 16px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text-3);
}
.future-dots {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 40px);
}
.future-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
}
.future-dots .dot-now {
  background: var(--accent);
  border-color: var(--accent);
}

/* ---------- 减少动态效果 ---------- */

@media (prefers-reduced-motion: reduce) {
  .hero-scroll::after {
    animation: none;
    opacity: 0;
  }
  .js .tl-line,
  .js .tl-node,
  .js .tl-label {
    transform: none;
    opacity: 1;
    transition: none;
  }
}