/* ===================================================================
   singularity.css — 奇点科创页面
   - 复刻首页 liquid-glass + DriftWall + cinema 视觉骨架
   - 强调色：琥珀橙 (#FFB347) — 与首页霓虹绿/研学薄荷绿区分
   - 6 项目总览海报墙 + 项目详情区
   - 全程移动端适配
   =================================================================== */

/* ---------- 导航「奇点科创」入口（琥珀橙，对比薄荷绿与霓虹绿） ---------- */
:root {
  --sg-accent: #FFB347;
  --sg-accent-soft: rgba(255, 179, 71, 0.16);
  --sg-accent-strong: rgba(255, 179, 71, 0.92);
  --sg-accent-glow: rgba(255, 179, 71, 0.35);
  --sg-edge: rgba(255, 179, 71, 0.42);
}

.nav-link--singularity {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  color: #FFD79A;
  background: linear-gradient(135deg, rgba(255, 179, 71, 0.16), rgba(255, 179, 71, 0.06));
  border: 1px solid rgba(255, 179, 71, 0.42);
  box-shadow: 0 8px 22px rgba(255, 179, 71, 0.18);
  letter-spacing: 0.08em;
  transition: color 180ms ease, background 180ms ease, transform 180ms ease, border-color 180ms ease;
}
.nav-link--singularity::after {
  content: "";
  position: absolute;
  top: 0.35rem;
  right: 0.45rem;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 999px;
  background: #FFB347;
  box-shadow: 0 0 8px rgba(255, 179, 71, 0.9);
}
.nav-link--singularity:hover,
.nav-link--singularity:focus-visible,
.nav-link--singularity.is-active {
  color: #fff5e6;
  background: linear-gradient(135deg, rgba(255, 179, 71, 0.36), rgba(255, 179, 71, 0.14));
  border-color: rgba(255, 220, 170, 0.85);
  transform: translateY(-1px);
}

/* ---------- 椤圭洰鎬昏娴锋姤澧欙紙澶嶅埢棣栭〉 poster-matrix 3 鍒桟arousel + 鐞ョ弨寮鸿皟锛?---------- */
.sg-overview {
  padding: clamp(4rem, 8vw, 6rem) 0 clamp(5rem, 8vw, 7rem);
  background:
    radial-gradient(ellipse 60% 80% at 18% 22%, rgba(255, 179, 71, 0.06), transparent 60%),
    radial-gradient(ellipse 60% 80% at 82% 88%, rgba(255, 95, 109, 0.05), transparent 60%),
    var(--bg);
}
.sg-overview__header {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: clamp(2.5rem, 5vw, 3.5rem);
}
.sg-overview__heading {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.sg-overview__eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: rgba(239, 244, 255, 0.66);
}
.sg-overview__title {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.75rem);
  line-height: 0.98;
  color: var(--cream);
}
.sg-overview__title em {
  font-style: normal;
  color: var(--sg-accent);
}
.sg-overview__lede {
  max-width: 38rem;
  margin: 0;
  color: rgba(239, 244, 255, 0.66);
  font-size: clamp(0.875rem, 1.2vw, 1rem);
  line-height: 1.85;
}

.sg-overview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 2.5vw, 2rem);
  align-items: stretch;
}
.sg-overview-card--featured {
  /* 视觉强化但保持 grid 单元尺寸，与其他卡片同列 */
}
@media (max-width: 960px) {
  .sg-overview-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .sg-overview-grid { grid-template-columns: 1fr; max-width: 32rem; margin: 0 auto; }
}

.sg-overview-card {
  display: flex;
  flex-direction: column;
  padding: 1rem;
  border-radius: 1.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 40px -20px rgba(0, 0, 0, 0.6);
  transition: transform 320ms cubic-bezier(0.22, 1, 0.36, 1), box-shadow 320ms ease, background 320ms ease, border-color 320ms ease;
  position: relative;
  isolation: isolate;
  cursor: pointer;
}
.sg-overview-card:hover,
.sg-overview-card:focus-within {
  transform: translateY(-6px);
  box-shadow: 0 30px 60px -22px rgba(255, 179, 71, 0.32), 0 0 0 1px rgba(255, 179, 71, 0.45);
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 179, 71, 0.4);
}
.sg-overview-card--featured {
  background: linear-gradient(135deg, rgba(255, 179, 71, 0.12), rgba(255, 140, 66, 0.05));
  border-color: rgba(255, 179, 71, 0.4);
  box-shadow: 0 24px 56px -22px rgba(255, 179, 71, 0.45), 0 0 0 1px rgba(255, 179, 71, 0.18);
}
.sg-overview-card--featured:hover {
  box-shadow: 0 36px 72px -22px rgba(255, 179, 71, 0.6), 0 0 0 1px rgba(255, 179, 71, 0.55);
}

.sg-overview-card__media {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 1.25rem;
  overflow: hidden;
  background: #0e1230;
}
.sg-overview-card--featured .sg-overview-card__media {
  /* 与其他卡同尺寸，但内部 rank/label/title 字号略大 */
}
.sg-overview-card__slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transform: scale(1.03);
  transition: opacity 0.5s ease, transform 0.7s ease;
  pointer-events: none;
}
.sg-overview-card__slide.is-active {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

.sg-overview-card__nav {
  position: absolute;
  z-index: 4;
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  background: rgba(1, 8, 40, 0.72);
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  transition: opacity 220ms ease, background 180ms ease, transform 180ms ease, border-color 180ms ease;
}
.sg-overview-card:hover .sg-overview-card__nav,
.sg-overview-card:focus-within .sg-overview-card__nav,
.sg-overview-card__nav:focus-visible {
  opacity: 1;
}
.sg-overview-card__nav--prev { left: 0.65rem; }
.sg-overview-card__nav--next { right: 0.65rem; }
.sg-overview-card__nav:hover {
  background: var(--sg-accent);
  border-color: var(--sg-accent);
  color: #2b1500;
}

.sg-overview-card__dots {
  position: absolute;
  z-index: 4;
  left: 50%;
  bottom: 0.65rem;
  display: flex;
  gap: 0.32rem;
  transform: translateX(-50%);
}
.sg-overview-card__dot {
  width: 0.4rem;
  height: 0.4rem;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.55);
  cursor: pointer;
  transition: width 0.2s ease, background 0.2s ease;
}
.sg-overview-card__dot.is-active {
  width: 1.1rem;
  background: var(--sg-accent);
}

.sg-overview-card__rank {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.3rem;
  height: 2.3rem;
  padding: 0 0.55rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--sg-accent), #FF8C42);
  color: #2b1500;
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  box-shadow: 0 12px 24px rgba(255, 179, 71, 0.42);
}
.sg-overview-card--featured .sg-overview-card__rank {
  font-size: 0.95rem;
  height: 2.5rem;
  padding: 0 0.75rem;
}

.sg-overview-card__overlay {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
  padding: 1rem 1.125rem;
  border-radius: 1.125rem;
  background: rgba(255, 255, 255, 0.04);
}
.sg-overview-card__meta {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}
.sg-overview-card__label {
  font-size: 0.6875rem;
  color: var(--sg-accent);
  letter-spacing: 0.12em;
}
.sg-overview-card__title {
  margin: 0;
  font-size: 1.4rem;
  letter-spacing: 0.02em;
  color: var(--cream);
}
.sg-overview-card__title em {
  font-style: normal;
  color: var(--sg-accent);
}
.sg-overview-card--featured .sg-overview-card__title {
  font-size: 1.7rem;
}
.sg-overview-card__desc {
  margin: 0;
  font-size: 0.72rem;
  color: rgba(239, 244, 255, 0.66);
}
.sg-overview-card--featured .sg-overview-card__desc {
  font-size: 0.82rem;
}
.sg-overview-card__arrow {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 3rem;
  height: 3rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--sg-accent), #FF8C42);
  color: #2b1500;
  box-shadow: 0 16px 32px rgba(255, 179, 71, 0.36);
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
}
.sg-overview-card__arrow svg { stroke: currentColor; fill: none; stroke-width: 2; }
.sg-overview-card:hover .sg-overview-card__arrow,
.sg-overview-card:focus-within .sg-overview-card__arrow {
  transform: translateX(4px) rotate(-6deg);
}


/* ---------- 奇点科创 hero ---------- */

/* ---------- 奇点科创 hero ---------- */
.sg-hero {
  position: relative;
  min-height: calc(100vh - 4rem);
  border-radius: 0 0 32px 32px;
  overflow: hidden;
  isolation: isolate;
}
.sg-hero__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  filter: saturate(1.12) brightness(0.95) contrast(1.05);
}
.sg-hero__shade {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(1, 8, 40, 0.28) 0%, rgba(1, 8, 40, 0.18) 42%, rgba(1, 8, 40, 0.62) 100%),
    radial-gradient(circle at 78% 18%, rgba(255, 179, 71, 0.18), transparent 38%),
    linear-gradient(90deg, rgba(1, 8, 40, 0.42) 0%, rgba(1, 8, 40, 0.06) 52%, rgba(1, 8, 40, 0.34) 100%);
}
.sg-hero__container {
  position: relative;
  z-index: 2;
  min-height: inherit;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-block: 1.3rem clamp(3rem, 6vw, 5rem);
}
.sg-hero__copy { padding-bottom: clamp(1rem, 4vw, 2.5rem); }
.sg-hero__eyebrow {
  display: inline-block;
  font-size: clamp(1rem, 1.6vw, 1.4rem);
  color: var(--sg-accent);
  letter-spacing: 0.04em;
}
.sg-hero__title {
  margin: 0.4rem 0 0;
  font-size: clamp(2.4rem, 6vw, 5rem);
  line-height: 1.05;
  color: var(--cream);
  text-shadow: 0 0 32px rgba(255, 179, 71, 0.22);
}
.sg-hero__title em {
  font-style: normal;
  color: var(--sg-accent);
}
.sg-hero__tagline {
  margin: 1rem 0 0;
  max-width: 36rem;
  color: rgba(239, 244, 255, 0.78);
  font-size: clamp(0.875rem, 1.4vw, 1rem);
  line-height: 1.8;
}
.sg-hero__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ---------- 项目详情区（6 个 region，复用 DriftWall / cinema 模式） ---------- */
.sg-region {
  padding: clamp(4rem, 7vw, 6rem) 0 clamp(3rem, 6vw, 5rem);
  scroll-margin-top: 5rem;
  position: relative;
}
.sg-region + .sg-region { padding-top: clamp(2rem, 4vw, 3rem); }
.sg-region:nth-of-type(odd) {
  background:
    radial-gradient(ellipse 90% 60% at 18% 0%, rgba(255, 179, 71, 0.04), transparent 60%);
}
.sg-region__header {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  justify-content: space-between;
  margin-bottom: clamp(2rem, 4vw, 3rem);
  position: relative;
  z-index: 3;
}
@media (min-width: 880px) {
  .sg-region__header { flex-direction: row; align-items: flex-end; }
}
.sg-region__eyebrow {
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  color: rgba(239, 244, 255, 0.66);
}
.sg-region__title {
  margin: 0.5rem 0 0;
  font-size: clamp(2rem, 5vw, 3.75rem);
  line-height: 0.98;
  color: var(--cream);
}
.sg-region__title em {
  font-style: normal;
  color: var(--sg-accent);
}
.sg-region__lede {
  max-width: 32rem;
  margin: 0;
  color: rgba(239, 244, 255, 0.7);
  font-size: clamp(0.875rem, 1.2vw, 1rem);
  line-height: 1.85;
}
.sg-region__chip-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.sg-region__chip {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--sg-accent);
  background: rgba(255, 179, 71, 0.08);
  border: 1px solid rgba(255, 179, 71, 0.26);
}

/* ---------- 特色项目子卡片网格（5 个视频） ---------- */
.sg-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 0 0 clamp(2.5rem, 4vw, 3.5rem);
}
.sg-feature-card {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding: 1rem;
  border-radius: 1.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: transform 240ms cubic-bezier(0.22, 1, 0.36, 1), background 240ms ease, border-color 240ms ease, box-shadow 240ms ease;
  cursor: pointer;
}
.sg-feature-card:hover,
.sg-feature-card:focus-within {
  transform: translateY(-4px);
  background: rgba(255, 179, 71, 0.06);
  border-color: rgba(255, 179, 71, 0.35);
  box-shadow: 0 24px 48px -18px rgba(255, 179, 71, 0.32);
}
.sg-feature-card__media {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  border-radius: 1rem;
  overflow: hidden;
  background: #0e1230;
}
.sg-feature-card__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) brightness(0.9);
  transition: filter 240ms ease;
}
.sg-feature-card:hover .sg-feature-card__video,
.sg-feature-card:focus-within .sg-feature-card__video {
  filter: saturate(1.1) brightness(1);
}
.sg-feature-card__play {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 999px;
  background: rgba(1, 8, 40, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: var(--cream);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  pointer-events: none;
  transition: transform 200ms ease, background 200ms ease;
}
.sg-feature-card:hover .sg-feature-card__play { transform: translate(-50%, -50%) scale(1.06); }
.sg-feature-card__play svg { width: 1rem; height: 1rem; fill: var(--sg-accent); stroke: #2b1500; stroke-width: 2; }
.sg-feature-card__meta {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0 0.25rem 0.25rem;
}
.sg-feature-card__label {
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--sg-accent);
}
.sg-feature-card__name {
  font-size: 1.05rem;
  color: var(--cream);
  margin: 0;
}
.sg-feature-card__hint {
  font-size: 0.7rem;
  color: rgba(239, 244, 255, 0.55);
  margin: 0;
}

/* ---------- 画廊（DriftWall 改色，琥珀） ---------- */
/* 双排水平反向滚动（慢速·悬停暂停·无缝循环）— 与研学一致 */
.sg-gallery {
  position: relative;
  margin: 0 0 clamp(2.5rem, 4vw, 3.5rem);
  --dw-tile-w: clamp(180px, 16vw, 220px);
  --dw-tile-h: calc(var(--dw-tile-w) * 1.333);
  --dw-gap: 14px;
  --dw-radius: 18px;
  --dw-speed: 10s;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 14px 0;
  overflow: hidden;
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01)),
    radial-gradient(ellipse 70% 90% at 50% 30%, rgba(255, 179, 71, 0.08), transparent 60%);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

/* Live 闪烁指示器 */
.sg-gallery::before {
  content: "●  LIVE";
  position: absolute;
  top: 14px;
  right: 18px;
  width: auto;
  height: 26px;
  padding: 0 14px 0 10px;
  border-radius: 999px;
  background: rgba(255, 179, 71, 0.28);
  color: #FFB347;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1.5px solid rgba(255, 179, 71, 0.6);
  box-shadow: 0 0 20px rgba(255, 179, 71, 0.45), inset 0 0 12px rgba(255, 179, 71, 0.18);
  z-index: 5;
  pointer-events: none;
  text-shadow: 0 0 8px rgba(255, 179, 71, 0.5);
}
.sg-gallery::after {
  content: "";
  position: absolute;
  top: 21px;
  right: 26px;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: #FFB347;
  box-shadow: 0 0 10px #FFB347;
  z-index: 5;
  animation: sg-live-pulse 1.6s ease-in-out infinite;
  pointer-events: none;
}
@keyframes sg-live-pulse {
  0%, 100% { opacity: 0.4; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.2); }
}
.sg-gallery__row {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--dw-gap);
  width: max-content;
  will-change: transform;
}
.sg-gallery__row--forward {
  animation: sg-row-forward var(--dw-speed) linear infinite;
}
.sg-gallery__row--reverse {
  animation: sg-row-reverse var(--dw-speed) linear infinite;
}
.sg-gallery:hover .sg-gallery__row--forward,
.sg-gallery:hover .sg-gallery__row--reverse { animation-play-state: paused; }

@keyframes sg-row-forward {
  0%   { transform: translate3d(0, 0, 0); }
  100% { transform: translate3d(-50%, 0, 0); }
}
@keyframes sg-row-reverse {
  0%   { transform: translate3d(-50%, 0, 0); }
  100% { transform: translate3d(0, 0, 0); }
}
@media (prefers-reduced-motion: reduce) {
  .sg-gallery__row { animation: none !important; }
}

/* tile / inner（hover 提亮·琥珀描边）— 与 yanxue 一致 */
.sg-page .drift-wall__tile {
  position: relative;
  flex: 0 0 auto;
  width: var(--dw-tile-w);
  height: var(--dw-tile-h);
  outline: none;
  cursor: zoom-in;
}
.sg-page .drift-wall__inner {
  position: absolute;
  inset: 0;
  display: block;
  border-radius: var(--dw-radius);
  overflow: hidden;
  background: #1c2150;
  filter: saturate(1.08) brightness(1.04);
  transition:
    transform 0.42s cubic-bezier(0.22, 1, 0.36, 1),
    filter 0.42s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.42s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 0 14px 30px -18px rgba(0, 0, 0, 0.55);
  border: 0;
  opacity: 1;
  transform: none;
}
.sg-page .drift-wall__inner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
}
.sg-page .drift-wall__tile:hover .drift-wall__inner,
.sg-page .drift-wall__tile:focus-visible .drift-wall__inner {
  filter: saturate(1.22) brightness(1.12);
  transform: scale(1.05);
  box-shadow:
    0 26px 56px -18px rgba(0, 0, 0, 0.7),
    0 0 0 2px rgba(255, 179, 71, 0.85),
    0 0 32px rgba(255, 179, 71, 0.4);
  z-index: 1;
}

@media (max-width: 760px) {
  .sg-gallery {
    --dw-tile-w: clamp(180px, 44vw, 300px);
    --dw-tile-h: 240px;
    --dw-speed: 22s;
    gap: 10px;
    border-radius: 20px;
  }
}

/* ---------- /* ---------- 视频影院 cinema ---------- */
.sg-cinema {
  margin-top: clamp(1rem, 2vw, 1.5rem);
}
.sg-cinema__wall {
  position: relative;
  border-radius: 1.75rem;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #0e1230;
  box-shadow: 0 24px 60px -22px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1), box-shadow 220ms ease;
}
.sg-cinema__wall:hover,
.sg-cinema__wall:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 32px 70px -22px rgba(255, 179, 71, 0.32), 0 0 0 1px rgba(255, 179, 71, 0.45);
}
.sg-cinema__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.sg-cinema__enter {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  display: inline-grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  background: rgba(1, 8, 40, 0.72);
  color: var(--cream);
  cursor: pointer;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background 200ms ease, transform 200ms ease, border-color 200ms ease, color 200ms ease;
  z-index: 3;
  -webkit-tap-highlight-color: transparent;
}
.sg-cinema__enter svg { width: 1.1rem; height: 1.1rem; display: block; }
.sg-cinema__enter .sg-cinema__icon--unmuted { display: none; }
.sg-cinema__enter.is-unmuted .sg-cinema__icon--muted { display: none; }
.sg-cinema__enter.is-unmuted .sg-cinema__icon--unmuted { display: block; }
.sg-cinema__enter:hover,
.sg-cinema__enter:focus-visible {
  background: rgba(255, 179, 71, 0.18);
  border-color: var(--sg-accent);
  color: var(--sg-accent);
  transform: scale(1.08);
}
.sg-cinema__enter.is-unmuted {
  background: var(--sg-accent);
  border-color: var(--sg-accent);
  color: #2b1500;
}
.sg-cinema__enter.is-unmuted:hover,
.sg-cinema__enter.is-unmuted:focus-visible {
  color: #2b1500;
  transform: scale(1.08);
}
.sg-cinema__hint {
  position: absolute;
  right: 1.25rem;
  top: 1rem;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  background: rgba(1, 8, 40, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: rgba(239, 244, 255, 0.82);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  z-index: 2;
  pointer-events: none;
}
.sg-cinema__hint svg { fill: none; stroke: var(--sg-accent); stroke-width: 2; width: 0.85rem; height: 0.85rem; }
.sg-cinema__label {
  position: absolute;
  left: 1.25rem;
  bottom: 1.25rem;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--cream);
  background: rgba(1, 8, 40, 0.66);
  border: 1px solid rgba(255, 255, 255, 0.12);
  z-index: 2;
}
.sg-cinema__thumbs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.65rem;
  margin-top: 0.85rem;
}
.sg-cinema__thumb {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.45rem;
  padding: 0.55rem;
  border-radius: 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
  transition: border-color 200ms ease, background 200ms ease;
}
.sg-cinema__thumb:hover { border-color: rgba(255, 179, 71, 0.45); }
.sg-cinema__thumb.is-active {
  border-color: var(--sg-accent);
  background: rgba(255, 179, 71, 0.08);
}
.sg-cinema__thumb-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  border-radius: 0.65rem;
  overflow: hidden;
  background: #0e1230;
}
.sg-cinema__thumb-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.sg-cinema__thumb-label {
  font-size: 0.78rem;
  color: var(--cream);
  letter-spacing: 0.04em;
}
.sg-cinema__header {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}
.sg-cinema__title {
  margin: 0;
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  color: var(--cream);
}
.sg-cinema__sub {
  margin: 0;
  color: rgba(239, 244, 255, 0.6);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

/* 移动端 cinema 按钮 hint 缩小 */
@media (max-width: 760px) {
  .sg-cinema__enter { width: 2.9rem; height: 2.9rem; right: 0.85rem; bottom: 0.85rem; }
  .sg-cinema__enter svg { width: 1.2rem; height: 1.2rem; }
  .sg-cinema__hint { font-size: 0.62rem; padding: 0.4rem 0.7rem; right: 0.7rem; top: 0.7rem; }
  .sg-hero { min-height: calc(100vh - 6rem); }
  .sg-overview-card__title { font-size: 1.2rem; }
  .sg-region__title { font-size: 1.85rem; }
  .sg-feature-grid { grid-template-columns: 1fr; }
  .sg-cinema__thumbs { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
  .sg-cinema__enter { width: 3rem; height: 3rem; right: 0.85rem; bottom: 0.85rem; }
  .sg-cinema__enter svg { width: 1.2rem; height: 1.2rem; }
  .sg-cinema__label { font-size: 0.66rem; }
  .sg-hero__cta-row { gap: 0.5rem; }
  .sg-hero__cta-row a { font-size: 0.85rem; padding: 0.65rem 0.95rem !important; }
}

@media (max-width: 480px) {
  .sg-region__title { font-size: 1.7rem; }
  .sg-overview-card__title { font-size: 1.15rem; }
}

/* 性能：图片加载占位灰底浅入 */
.drift-wall__inner img { background: #0e1230; }

/* 滚动锚点修正 */
.sg-region { scroll-margin-top: clamp(5.5rem, 13vw, 8rem); }