/* ============ 关于我们 AboutSection ============ */
.about { background: var(--bg-0); }

.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 5rem;
  align-items: start;
}

.about-lead {
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 2;
  font-weight: 400;
}
.about-body {
  margin-top: 1.6rem;
  color: var(--ink-dim);
  line-height: 2.2;
  font-size: 0.96rem;
}

.about-facts {
  list-style: none;
  margin-top: 3rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-soft);
}
.about-facts li {
  position: relative;
  padding: 1.6rem 0.8rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
/* 条目底部金线：点亮时自左扫过 */
.about-facts li::after {
  content: '';
  position: absolute;
  left: 0; bottom: -1px;
  width: 100%; height: 1px;
  background: linear-gradient(90deg, var(--gold), rgba(212,175,55,0));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.7s var(--ease-lux);
}
.about-facts li.is-lit::after { transform: scaleX(1); }
.fact-value {
  font-size: 2rem;
  font-variant-numeric: tabular-nums;
  transition: text-shadow 0.6s;
}
.about-facts li.is-lit .fact-value { text-shadow: 0 0 22px rgba(212,175,55,0.45); }
.fact-key { font-size: 0.8rem; color: var(--ink-dim); letter-spacing: 0.16em; }

.about-timeline {
  position: relative;
  padding-left: 2.2rem;
}
/* 暗色底轨 + 金色生长轨（scaleY 由 GSAP 驱动） */
.timeline-rail {
  position: absolute;
  left: 0; top: 0.4rem; bottom: 0.4rem;
  width: 1px;
  background: var(--line-soft);
}
.timeline-progress {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--gold), rgba(212,175,55,0.15));
  box-shadow: 0 0 10px rgba(212,175,55,0.35);
  transform: scaleY(1);
  transform-origin: top center;
}
.milestone {
  position: relative;
  padding: 0 0 2.1rem 0.6rem;
}
/* 菱形记号：默认暗态，点亮后转金并发光 */
.milestone::before {
  content: '';
  position: absolute;
  left: -2.2rem; top: 0.5rem;
  width: 7px; height: 7px;
  transform: translateX(-3px) rotate(45deg) scale(0.7);
  background: var(--line);
  transition: background 0.5s, box-shadow 0.5s, transform 0.5s var(--ease-spring-soft);
}
.milestone.is-lit::before {
  background: var(--gold);
  box-shadow: 0 0 14px rgba(212,175,55,0.85);
  transform: translateX(-3px) rotate(45deg) scale(1);
}
.milestone-year {
  font-size: 1.3rem;
  letter-spacing: 0.1em;
  transition: color 0.5s, text-shadow 0.5s;
}
.milestone.is-lit .milestone-year { text-shadow: 0 0 18px rgba(212,175,55,0.4); }
.milestone-text {
  margin-top: 0.4rem;
  color: var(--ink-dim);
  font-size: 0.9rem;
  line-height: 1.9;
}

.about-scope {
  margin-top: 5rem;
  padding: 2rem 2.4rem;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 2.4rem;
  background: linear-gradient(115deg, rgba(212,175,55,0.05), transparent 60%);
}
.scope-label {
  flex-shrink: 0;
  font-family: var(--serif);
  font-size: 1.05rem;
  letter-spacing: 0.3em;
  color: var(--gold);
  border-right: 1px solid var(--line);
  padding-right: 2.4rem;
}
.scope-text { color: var(--ink-dim); font-size: 0.92rem; line-height: 2; letter-spacing: 0.06em; }

@media (max-width: 960px) {
  .about-grid { grid-template-columns: 1fr; gap: 3.5rem; }
  .about-facts { grid-template-columns: repeat(2, 1fr); row-gap: 1.4rem; }
  .about-scope { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .scope-label { border-right: none; padding-right: 0; }
}

@media (max-width: 560px) {
  .fact-value { font-size: 1.55rem; }
  .fact-key { font-size: 0.72rem; }
  .about-scope { padding: 1.4rem 1.3rem; margin-top: 3.5rem; }
  .scope-text { font-size: 0.84rem; }
  .milestone-text { font-size: 0.85rem; }
}

/* ============ 服务项目 ServicesSection（3D 翻转卡片系统） ============ */
.services {
  background:
    radial-gradient(60rem 30rem at 85% 0%, rgba(212,175,55,0.05), transparent 60%),
    var(--bg-1);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.4rem;
  perspective: 1400px;
}

.service-card {
  position: relative;
  height: 23rem;
  cursor: pointer;
  perspective: 1200px;
  will-change: transform, opacity;
}

/* 翻转内层：preserve-3d 双面结构 */
.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.95s var(--ease-lux);
}
.service-card.flipped .card-inner { transform: rotateY(180deg); }
@media (hover: hover) and (pointer: fine) {
  .service-card:hover .card-inner { transform: rotateY(180deg); }
}

.card-face {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition: border-color 0.5s;
}
.service-card:hover .card-face { border-color: rgba(212,175,55,0.5); }

/* 正面：场景图 */
.card-front { background: var(--bg-2); overflow: hidden; }
/* 图片用 inset 负值四边严格超出卡面 12%，视差在余量内移动 —— 任何滚动位置都撑满，不露黑边 */
.card-front img {
  position: absolute;
  left: -12%; top: -12%; right: -12%; bottom: -12%;
  width: 124%; height: 124%;
  max-width: none;   /* 覆盖全局 img{max-width:100%}，否则宽度被压回卡面宽导致右侧露边 */
  object-fit: cover;
  filter: saturate(0.9) brightness(0.9);
  transition: filter 0.9s;
  will-change: transform;
}
.service-card:hover .card-front img { filter: saturate(1.05) brightness(1); }
.card-front::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8,8,10,0.08) 30%, rgba(8,8,10,0.88) 88%);
}
.card-no {
  position: absolute;
  top: 1.1rem; left: 1.2rem;
  z-index: 2;
  font-size: 1.55rem;
  text-shadow: 0 2px 14px rgba(0,0,0,0.7);
}
.card-front-info {
  position: absolute;
  left: 1.3rem; right: 1.3rem; bottom: 1.2rem;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.card-title {
  font-family: var(--serif);
  font-size: 1.42rem;
  font-weight: 700;
  letter-spacing: 0.22em;
}
.card-en {
  font-family: var(--latin);
  font-style: italic;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--ink-dim);
}
.card-flip-hint {
  position: absolute;
  top: 1.1rem; right: 1.2rem;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  color: var(--gold-hi);
  opacity: 0.85;
}
.card-flip-hint svg { animation: hintSpin 5s linear infinite; }
@keyframes hintSpin { to { transform: rotate(360deg); } }
/* 桌面 hover 翻面时提示淡出；触屏端始终可见（点击翻面需要提示） */
@media (hover: hover) and (pointer: fine) {
  .service-card:hover .card-flip-hint { opacity: 0; }
}

/* 背面：详情 */
.card-back {
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  padding: 1.7rem 1.5rem 1.5rem;
  background:
    radial-gradient(24rem 18rem at 85% 0%, rgba(212,175,55,0.1), transparent 65%),
    linear-gradient(160deg, #17141d, #0b0a0e);
}
.card-back-no { font-size: 1.5rem; }
.card-back-title {
  margin-top: 0.7rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--gold-hi);
}
.card-back-en {
  margin: 0.3rem 0 1rem;
  font-family: var(--latin);
  font-style: italic;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
}
.card-desc {
  margin-top: 1.1rem;
  color: var(--ink-dim);
  font-size: 0.83rem;
  line-height: 1.95;
  flex: 1;
}
.card-tags { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.card-tag {
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--gold-hi);
  border: 1px solid rgba(212,175,55,0.35);
  padding: 0.28rem 0.65rem;
}
.card-link {
  margin-top: 1.2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  align-self: flex-start;
  font-size: 0.78rem;
  letter-spacing: 0.26em;
  color: var(--gold);
  padding: 0.55rem 0 0.6rem;
  border-bottom: 1px solid rgba(212,175,55,0.45);
  transition: color 0.4s, gap 0.4s var(--ease-lux);
}
.card-link:hover { color: var(--gold-hi); gap: 0.85rem; }
/* 触屏端背面"轻触返回"提示，避免用户翻面后不知道如何翻回 */
.card-back-hint {
  display: none;
  margin-top: 0.7rem;
  font-size: 0.62rem;
  letter-spacing: 0.24em;
  color: var(--ink-faint);
  text-align: center;
}
@media (hover: none), (pointer: coarse) {
  .card-back-hint { display: block; }
}

@media (max-width: 1100px) { .services-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) {
  .services-grid { grid-template-columns: 1fr; gap: 1rem; }
  .service-card { height: 20rem; }
  .card-title { font-size: 1.25rem; }
}

/* ============ 三卡裂变剧场（任务 6，桌面端 pin + scrub） ============ */
.svc-trio { display: block; }   /* 桌面为 pin 裂变剧场；移动端降级为翻面卡片（功能下放） */

.svc-trio-stage {
  /* 88vh：比整屏略矮，翻面完成后更快滚出衔接下方服务列表，减少长段空白 */
  height: 88vh;
  min-height: 34rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.6rem;
  overflow: hidden;
}
.svc-trio-title {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.6vw, 2.3rem);
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ink);
  text-align: center;
}
.svc-trio-title span {
  display: block;
  margin-top: 0.55rem;
  font-family: var(--latin);
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.42em;
  color: var(--gold);
}

.svc-trio-track {
  display: flex;
  gap: 0;                 /* 裂变时由 JS 生长到 20px */
  width: 75%;             /* 由 JS 在 75%→60% 间驱动 */
  height: min(50vh, 27rem);
  perspective: 1600px;
}
.svc-panel {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  border-radius: 0;       /* 裂变时由 JS 生长 */
  will-change: transform;
  transition: box-shadow 0.5s var(--ease-lux);
}
.svc-panel:hover { box-shadow: 0 0 44px rgba(212, 175, 55, 0.16); }
.svc-panel-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  will-change: transform;
}
.svc-panel-face {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: inherit;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

/* 正面：同一张宽幅图的三段切片（img 宽 300%，按序负 margin 对齐，无缝拼接） */
.svc-panel-front { background: var(--bg-2); }
.svc-panel-imgwrap { position: absolute; inset: 0; overflow: hidden; }
.svc-panel-imgwrap img {
  width: 300%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  filter: saturate(0.92) brightness(0.88);
}
.svc-panel-front::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8,8,10,0.05) 40%, rgba(8,8,10,0.6) 100%);
}
.svc-panel-front::before {
  content: '';
  position: absolute;
  inset: 0.55rem;
  border: 1px solid rgba(212, 175, 55, 0.18);
  z-index: 2;
  pointer-events: none;
}
.svc-panel-no {
  position: absolute;
  top: 1rem; left: 1.1rem;
  z-index: 3;
  font-size: 1.4rem;
  text-shadow: 0 2px 14px rgba(0,0,0,0.7);
  animation: svcNoPulse 3.4s ease-in-out infinite;
}
@keyframes svcNoPulse {
  0%, 100% { opacity: 0.72; text-shadow: 0 2px 14px rgba(0,0,0,0.7); }
  50% { opacity: 1; text-shadow: 0 0 18px rgba(212,175,55,0.55), 0 2px 14px rgba(0,0,0,0.7); }
}

/* 背面：支柱排版 */
.svc-panel-back {
  transform: rotateY(180deg);
  background:
    radial-gradient(22rem 14rem at 90% 0%, rgba(212,175,55,0.1), transparent 60%),
    linear-gradient(165deg, #17140e, #0e0c09 70%);
  display: flex;
  flex-direction: column;
  padding: 1.8rem 1.6rem;
}
.svc-panel-back::before {
  content: '';
  position: absolute;
  inset: 0.55rem;
  border: 1px solid rgba(212, 175, 55, 0.16);
  pointer-events: none;
}
.svc-back-no { font-size: 1.7rem; opacity: 0.9; }
.svc-back-title {
  margin-top: 0.9rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  letter-spacing: 0.1em;
  color: var(--ink);
}
.svc-back-en {
  margin-top: 0.3rem;
  font-family: var(--latin);
  font-size: 0.66rem;
  letter-spacing: 0.4em;
  color: var(--gold);
}
.svc-panel-back .hairline { margin: 1rem 0; }
.svc-back-desc {
  font-size: 0.86rem;
  line-height: 1.9;
  color: var(--ink-dim);
  letter-spacing: 0.04em;
}
.svc-back-points {
  margin-top: auto;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.svc-back-points li {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  border: 1px solid rgba(212,175,55,0.35);
  padding: 0.3rem 0.7rem;
}
/* 触屏端三卡翻面后提示返回 */
.svc-back-hint {
  display: none;
  margin-top: 0.8rem;
  font-size: 0.62rem;
  letter-spacing: 0.24em;
  color: var(--ink-faint);
  text-align: center;
}
@media (hover: none), (pointer: coarse) {
  .svc-back-hint { display: block; }
}

/* 减弱动效偏好：彻底隐藏裂变剧场 */
@media (prefers-reduced-motion: reduce) {
  .svc-trio { display: none !important; }
}


/* ============ 关于我们：使命愿景三卡（真实公司资料） ============ */
.about-mission {
  margin-top: 2.4rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.am-item {
  border: 1px solid var(--line-soft);
  border-left: 2px solid rgba(212, 175, 55, 0.55);
  padding: 1.15rem 1.3rem;
  background: linear-gradient(115deg, rgba(212, 175, 55, 0.045), transparent 65%);
  transition: border-color 0.5s, box-shadow 0.5s;
}
.am-item:hover { border-color: rgba(212, 175, 55, 0.5); box-shadow: 0 0 24px rgba(212, 175, 55, 0.12); }
.am-key { font-size: 0.72rem; letter-spacing: 0.3em; color: var(--gold); }
.am-text { margin-top: 0.5rem; color: var(--ink-dim); font-size: 0.9rem; line-height: 1.9; }

/* ============ 移动端：三卡裂变降级为翻面卡片（功能下放） ============ */
.svc-flip-hint {
  display: none;
  position: absolute;
  left: 50%; bottom: 1.2rem;
  transform: translateX(-50%);
  z-index: 2;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--gold-hi);
  background: rgba(8, 8, 10, 0.62);
  border: 1px solid rgba(212, 175, 55, 0.45);
  padding: 0.4rem 0.9rem;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  pointer-events: none;
}
@media (max-width: 860px) {
  .svc-trio-stage { height: auto; padding: 1.5rem 0 2.5rem; gap: 1.6rem; overflow: visible; }
  .svc-trio-track { flex-direction: column; width: 100%; height: auto; gap: 1.2rem; perspective: 1400px; }
  .svc-panel { flex: none; width: 100%; height: 20rem; border-radius: 10px; }
  .svc-panel-inner { transition: transform 0.7s var(--ease-lux); }
  .svc-panel.tapped .svc-panel-inner { transform: rotateY(180deg); }
  .svc-panel-imgwrap img { width: 100% !important; margin-left: 0 !important; }
  .svc-flip-hint { display: inline-flex; }
}
@media (max-width: 560px) {
  .about-mission { grid-template-columns: 1fr; }
  .svc-panel { height: 17rem; }
  .svc-flip-hint { bottom: 0.9rem; font-size: 0.64rem; }
}