/* ============================================================
   光中传媒 · index-v3 模块布局样式
   文件: sections.css
   依赖: tokens.css → base.css → sections.css
   说明: 各区块静态布局 (交互光效写在 interactions.css)
   ============================================================ */

/* ============================================================
   00 · Navigation 液态玻璃导航
   · Phase1：初始 transform: translateY(-100%) 藏在视口外（文字动画完成后再滑入）
   · Phase2：加 .is-slid-in 后 translateY(0)
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--nav-height);
  pointer-events: none;
  /* 默认：深色玻璃 (在深色Hero上) */
  background-color: rgba(15, 17, 21, 0.55);
  backdrop-filter: blur(14px) saturate(180%);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  box-shadow:
    0 8px 32px rgba(0,0,0,0.28),
    inset 0 1px 0 rgba(255,255,255,0.06);
  /* 入场：整根从上向下滑落（1500ms Ease-In-Out-Quart：前20%蓄力→中段加速→尾段稳停，不再一来就冲） */
  transform: translateY(-100%);
  transition:
    transform         1500ms cubic-bezier(0.7, 0, 0.3, 1),
    background-color  0.4s var(--ease-interact),
    border-color      0.4s var(--ease-interact),
    box-shadow        0.4s var(--ease-interact),
    backdrop-filter   0.4s var(--ease-interact),
    -webkit-backdrop-filter 0.4s var(--ease-interact);
}
.nav.is-slid-in { transform: translateY(0); pointer-events: auto; }
.nav > * { pointer-events: auto; }

/* 滚动到浅色内容 → 浅色玻璃态 */
.nav.is-scrolled {
  background-color: rgba(247, 245, 242, 0.82);
  border-bottom-color: rgba(0,0,0,0.06);
  box-shadow:
    0 10px 40px rgba(0,0,0,0.08),
    inset 0 1px 0 rgba(255,255,255,0.6);
}
/* 滚动 + 在深色章节上 → 深色玻璃 */
.nav.is-scrolled.nav-on-dark {
  background-color: rgba(15, 17, 21, 0.76);
  border-bottom-color: rgba(255,255,255,0.08);
  box-shadow:
    0 10px 40px rgba(0,0,0,0.35),
    inset 0 1px 0 rgba(255,255,255,0.06);
}

/* 移动端全屏菜单展开 */
.nav.is-open {
  height: 100vh;
  pointer-events: auto;
}

.nav-inner {
  position: relative;
  width: 100%;
  height: 100%;
  max-width: var(--grid-max-width-nav);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: clamp(14px, 2vw, 36px);
  padding-right: clamp(12px, 1.6vw, 28px);
  gap: 18px;
}

/* ============================================================
   左侧品牌区：与原 index.html 对齐
   · 只有一张 <img>，高度由 .nav-brand 锁死 40px
   · 白字/黑字切换由 JS 直接改 src，不叠层不写 opacity
   ============================================================ */
.nav-brand {
  display: flex;
  align-items: center;
  height: 40px;
  flex-shrink: 0;
  text-decoration: none;
}
.nav-logo-img {
  display: block;
  height: 100%;
  width: auto;
  -webkit-user-drag: none;
  user-select: none;
  object-fit: contain;
  filter: none;
}

/* 主导航 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.2vw, 32px);
}
.nav-link {
  position: relative;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-dark-text);
  text-decoration: none;
  padding-block: 4px;
  transition: color 0.28s var(--ease-interact);
}
/* 浅色玻璃态 → 链接文字深色（与原 sections.css 对齐）*/
.nav.is-scrolled:not(.nav-on-dark) .nav-link {
  color: var(--color-text);
}
.nav.is-open .nav-menu {
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  flex-direction: column;
  align-items: flex-start;
  padding: 24px var(--grid-margin) 48px;
  gap: 18px;
  background-color: inherit;
  backdrop-filter: blur(14px) saturate(180%);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
}

/* ============================================================
   右侧：品牌色渐变 CTA 胶囊按钮（立即咨询）— 与原 sections.css 1344-1448 对齐
   · 三态自动切换：深色Hero态(白字橙底) / 浅色态(黑字白底青描边) / 深色章节态(白字橙底)
   · 所有选择器加 a. 类型前缀 + 拆开 background 写 4 件套
   ============================================================ */
a.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding-inline: 18px 20px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: #fff;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;

  background-image: linear-gradient(135deg,
    var(--color-brand) 0%,
    #FFB347          50%,
    var(--color-brand) 100%);
  background-size: 200% 200%;
  background-position: 0% 50%;
  background-repeat: no-repeat;

  box-shadow:
    0 6px 18px rgba(255, 160, 0, 0.32),
    inset 0 1px 0 rgba(255, 255, 255, 0.28);

  transition:
    background-color    0.4s var(--ease-interact),
    background-image    0.4s var(--ease-interact),
    background-position 0.45s var(--ease-interact),
    color               0.4s var(--ease-interact),
    box-shadow          0.32s var(--ease-interact),
    transform           0.22s var(--ease-interact),
    border-color        0.4s var(--ease-interact);
}
a.nav-cta:active {
  transform: translateY(0);
}

/* ---- 浅色玻璃态导航条（.is-scrolled 且不在深色章节） → 立即咨询切白底 + 黑色字 ---- */
.nav.is-scrolled:not(.nav-on-dark) a.nav-cta {
  color: var(--color-text);

  background-image: linear-gradient(135deg,
    #FFFFFF            0%,
    #F2FBFB           50%,
    #FFFFFF           100%);
  background-size: 200% 200%;
  background-position: 0% 50%;
  background-repeat: no-repeat;

  border: 1px solid rgba(0, 168, 198, 0.28);
  box-shadow:
    0 3px 12px rgba(0, 168, 198, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

/* ---- 深色玻璃态导航条（滚到 #works/#showcases/#about 等深色章节） → 与 Hero 一致：橙渐变白字 ---- */
.nav.is-scrolled.nav-on-dark a.nav-cta {
  color: #fff;

  background-image: linear-gradient(135deg,
    var(--color-brand) 0%,
    #FFB347          50%,
    var(--color-brand) 100%);
  background-size: 200% 200%;
  background-position: 0% 50%;
  background-repeat: no-repeat;

  border: none;
  box-shadow:
    0 6px 18px rgba(255, 160, 0, 0.32),
    inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

/* ============================================================
   汉堡按钮（液态玻璃圆盘，仅移动端 ≤900px 显示）
   ============================================================ */
.nav-toggle {
  position: relative;
  z-index: 2;
  display: none;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 50%;
  cursor: pointer;
  flex-shrink: 0;

  background-color: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);

  transition:
    background-color 0.3s var(--ease-interact),
    border-color     0.3s var(--ease-interact);
}
/* 浅色态汉堡圆盘换成浅灰半透 */
.nav.is-scrolled:not(.nav-on-dark) .nav-toggle {
  background-color: rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}
.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--color-dark-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav.is-scrolled:not(.nav-on-dark) .nav-toggle span {
  background: var(--color-text);
}
.nav.is-open .nav-toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav.is-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav-toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav { height: 64px; }
  .nav-inner  { height: 100%; padding-inline: 14px; padding-right: 14px; }
  .nav-brand  { height: 34px; }
  .nav-toggle { display: flex; flex-direction: column; gap: 4px; }
  .nav-menu,
  .nav-cta   { display: none; }
  .nav.is-open .nav-menu {
    display: flex;
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    top: 0;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 28px;
    background-color: inherit;
    backdrop-filter: blur(18px) saturate(180%);
    -webkit-backdrop-filter: blur(18px) saturate(180%);
    padding: 0;
  }
  .nav.is-open .nav-menu .nav-link {
    font-size: clamp(20px, 5vw, 32px);
    letter-spacing: 0.12em;
  }
  .nav.is-open .nav-cta {
    display: inline-flex;
    position: fixed;
    left: 50%;
    bottom: clamp(40px, 12vh, 120px);
    transform: translateX(-50%);
    z-index: 2;
  }
}

/* ============================================================
   01 · Hero 首屏
   Phase1（初始）：height=100vh 全屏黑场，LOGO/标题都在屏幕中心，Shdaer 渐亮后才可见
   Phase2（.is-squeezed）：被上下两部分"挤压"回 上部70vh + 下部30vh 经典布局
   · 过渡曲线 = cubic-bezier(0.76,0,0.24,1) （先快后稳的推挤阻尼感，900ms）
   ============================================================ */
.hero {
  position: relative;
  height: var(--hero-phase1-height);       /* Phase1：100vh 占满整屏 */
  min-height: var(--hero-phase1-height);
  background-color: #000;                  /* 初始纯黑 = 黑场，照亮后 Shader 覆盖 */
  overflow: hidden;
  transition:
    height     1500ms cubic-bezier(0.82, 0, 0.18, 1),
    min-height 1500ms cubic-bezier(0.82, 0, 0.18, 1);
  will-change: height;
}
/* Phase2：挤压完成后恢复原 100vh 总高（70+30 组合） */
.hero.is-squeezed {
  height: var(--hero-total-height);
  min-height: var(--hero-total-height);
}

/* Hero 光效 WebGL Canvas 容器 —— 覆盖整个 hero 100vh */
.wegic-root {
  position: absolute;
  inset: 0;
  z-index: var(--z-base);
  background: #000;
  pointer-events: none;
  overflow: hidden;
}
.wegic-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: #000;
  pointer-events: none;
}

/* 真实品牌 LOGO（W 形图）背景装饰层
   Phase1：屏幕正中央 + opacity:0（黑场中不可见）+ 大号尺寸
   Phase1 照亮过程中由 light.js 同步将 opacity 提升到 0.72
   Phase2：位置跳变到 (nav+upper)/2 中心 + 尺寸缩小到经典尺寸 */
.hero-logo-wrap {
  position: absolute;
  left: 50%;
  top: 50%;                                 /* Phase1：屏幕正中心 */
  transform: translate(-50%, -50%);
  z-index: 6;
  pointer-events: none;
  opacity: 0;                               /* Phase1 初始 = 0（黑场中LOGO也黑） */
  transition:
    top     1500ms cubic-bezier(0.82, 0, 0.18, 1),
    opacity 400ms cubic-bezier(0.22, 1, 0.36, 1);
  will-change: top, opacity;
}
.hero.is-squeezed .hero-logo-wrap {
  top: calc((var(--nav-height) + var(--hero-upper-height)) / 2);
}
.hero-logo {
  display: block;
  aspect-ratio: 384.82 / 361.01;
  height:    clamp(var(--hero-logo-p1-min), var(--hero-logo-p1-preferred), var(--hero-logo-p1-max)) !important;
  width:     auto !important;
  max-width: none !important;
  object-fit: contain;
  filter: drop-shadow(0 0 28px rgba(255,160,50,0.28)) drop-shadow(0 0 6px rgba(0,168,198,0.12));
  /* 挤压的尺寸收缩：1500ms 与 Hero 挤压严格同步（与 hero-logo-wrap top 同时到位，避免跳变） */
  transition: height 1500ms cubic-bezier(0.82, 0, 0.18, 1),
              width  1500ms cubic-bezier(0.82, 0, 0.18, 1),
              filter 400ms cubic-bezier(0.22, 1, 0.36, 1);
  will-change: height;
}
.hero.is-squeezed .hero-logo {
  height: clamp(var(--hero-logo-min), var(--hero-logo-preferred), var(--hero-logo-max)) !important;
}

/* 上部：标题内容
   Phase1：占满整 100vh
   Phase2：70vh 经典尺寸 */
.hero-upper {
  position: relative;
  z-index: var(--z-content);
  min-height: var(--hero-phase1-height);   /* Phase1：占满 100vh */
  display: flex;
  flex-direction: column;
  transition: min-height 1500ms cubic-bezier(0.82, 0, 0.18, 1);
  will-change: min-height;
}
.hero.is-squeezed .hero-upper {
  min-height: var(--hero-upper-height);    /* Phase2：70vh */
}
.hero-inner {
  position: relative;
  flex: 1 1 auto;
  min-height: var(--hero-phase1-height);
  width: 100%;
  max-width: 100%;
  margin-inline: auto;
  transition: min-height 1500ms cubic-bezier(0.82, 0, 0.18, 1);
}
/* Phase1（入场大字态）：解除 container-wide 8vw padding 夹逼，给 108px 超大体量的标题留足横向空间，左右只留 48px 呼吸感 */
.hero:not(.is-squeezed) .hero-inner {
  max-width: 1600px;
  padding-inline: min(3vw, 48px);
}
.hero.is-squeezed .hero-inner {
  min-height: var(--hero-upper-height);
}
/* 标题层定位：Phase1 / Phase2 统一使用超宽容器（永远不做 max-width 过渡 → 消灭挤压过程中文字折行跳变），Phase1 大字态强制保证两行不折，Phase2 缩小字号自然适配 */
.hero-content {
  position: absolute;
  left: 50%;
  top: 50%;                                 /* Phase1：屏幕正中心 */
  transform: translate(-50%, -50%);
  width: 100%;
  max-width: clamp(720px, 96vw, 1400px);   /* 统一：超宽容器（挤压前后不变），Phase1 108px 大字绝对能放下两行 */
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  transition: top 1500ms cubic-bezier(0.82, 0, 0.18, 1);  /* 只过渡 top，width/max 不变 → 无折行跳变 */
  will-change: top;
}
.hero.is-squeezed .hero-content {
  top: calc((var(--nav-height) + var(--hero-upper-height)) / 2);
  /* 挤压后不再改 max-width，仍然保持 1400px 宽，容器虽空但内容居中，视觉无差异且不会跳 */
}

/* Eyebrow："— 光影之间，创意无界"（入场动画：light:center-reached 后触发）*/
.hero-eyebrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.02);
  backdrop-filter: blur(8px);
  opacity: 0;
  transform: translateY(6px);
  filter: blur(4px);
  transition:
    opacity   700ms cubic-bezier(0.18, 0.75, 0.22, 1),
    transform 700ms cubic-bezier(0.18, 0.75, 0.22, 1),
    filter    700ms cubic-bezier(0.18, 0.75, 0.22, 1);
}
.hero-eyebrow.is-in { opacity: 1; transform: none; filter: none; }

/* 主标题：摄像机拉远运镜 120%→100% + 模糊逐词渐清
   Phase1（100vh）：大号字号 + 超宽容器，两行严格不折；Phase2（is-squeezed）：经典尺寸 + 820px紧凑 */
.hero-title {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  max-width: 1400px;                              /* Phase1：与 hero-content 同宽，放得下 108px 两行大字不折 */
  margin: 0 auto;
  font-size: clamp(44px, 9vw, 108px);      /* Phase1 入场大尺寸（底线 44 防止极小屏 nowrap 溢出）*/
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.02;
  color: #fff;
  text-align: center;
  transform-origin: 50% 50%;
  transform: scale(1.2);
  filter: blur(12px);
  opacity: 0;
  transition:
    transform 1580ms cubic-bezier(0.18, 0.75, 0.22, 1),
    filter    1580ms cubic-bezier(0.18, 0.75, 0.22, 1),
    opacity   1580ms cubic-bezier(0.18, 0.75, 0.22, 1),
    font-size 1500ms cubic-bezier(0.82, 0, 0.18, 1),   /* 挤压的字号缩小：与推挤 1500ms 严格同步 */
    max-width 1500ms cubic-bezier(0.82, 0, 0.18, 1); /* 挤压时宽度同时从 1400 → 820px（与字号同步，不会先变窄先折）*/
}
.hero-title.is-in {
  transform: scale(1);
  filter: none;
  opacity: 1;
}
.hero.is-squeezed .hero-title {
  font-size: clamp(38px, 7vw, 82px);       /* Phase2 挤压完成：经典尺寸 */
  max-width: 820px;                             /* Phase2：恢复经典紧凑宽度（字号已小，820px足够一行）*/
}
.hero-title:not(.is-in) { will-change: transform, opacity, filter; }
/* 两行严格不折：每个 hero-line 是独立 block + nowrap，无论字号多大、浏览器（不要 text-wrap: balance 自动"帮忙"折成三行）*/
.hero-line { display: block; white-space: nowrap; }
.word {
  display: inline-block;
  opacity: 0;
  transform: none;
  filter: blur(5px);
  background: linear-gradient(180deg, #FFFFFF 0%, rgba(255,255,255,0.92) 40%, rgba(255,255,255,0.78) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  -webkit-text-stroke: 1px rgba(0,0,0,0.05);
  transition:
    opacity 500ms cubic-bezier(0.18, 0.75, 0.22, 1),
    filter  500ms cubic-bezier(0.18, 0.75, 0.22, 1);
}
.word:not(.is-in) { will-change: opacity, filter; }
.word.is-in {
  opacity: 1;
  filter: none;
}
.word.brand {
  background: linear-gradient(180deg, #FFC36B, #FFA000);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.word.brand.is-in { filter: drop-shadow(0 0 20px rgba(255,160,0,0.45)); }

/* Subtitle："源自军旅 · 服务部队..." */
.hero-sub {
  font-size: var(--text-body-size);
  color: var(--color-dark-text-secondary);
  letter-spacing: 0.08em;
  opacity: 0;
  transform: translateY(10px);
  filter: blur(20px);
  transition:
    opacity   600ms cubic-bezier(0.18, 0.75, 0.22, 1),
    transform 600ms cubic-bezier(0.18, 0.75, 0.22, 1),
    filter    600ms cubic-bezier(0.18, 0.75, 0.22, 1);
  max-width: none;
}
.hero-sub.is-in { opacity: 1; transform: none; filter: none; }

.hero-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--space-4);
  opacity: 0;
  transform: translateY(10px);
  transition:
    opacity 600ms var(--ease-enter),
    transform 600ms var(--ease-enter);
}
.hero-actions.is-in { opacity: 1; transform: none; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 46px;
  padding: 0 28px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition:
    transform var(--duration-interact) var(--ease-interact),
    box-shadow var(--duration-interact-long) var(--ease-interact),
    background-color var(--duration-interact) var(--ease-interact),
    border-color var(--duration-interact) var(--ease-interact),
    color var(--duration-interact) var(--ease-interact),
    filter var(--duration-interact) var(--ease-interact);
}
.btn-pri {
  background: linear-gradient(135deg, #FFFFFF 0%, #F2EEE8 100%);
  color: #0b0d10;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.8),
    0 10px 30px rgba(255,255,255,0.12);
}
.btn-sec {
  background: rgba(255,255,255,0.06);
  color: var(--color-dark-text);
  border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(10px);
}

/* ============================================================
   Hero 底部提示组：移动鼠标 · 感受光影 + Scroll ↓（合并为同一文本容器，两行用子 class 区分）
   · 定位：第一屏最右下（.hero 锁定 height=100vh，bottom:32px 一定在视口内）
   · 颜色：整体降暗，不抢主视觉；保留极弱的黑投影以便在毛玻璃上可辨
   ============================================================ */
.hero-tips {
  position: absolute;
  right: clamp(12px, 1.6vw, 28px);
  bottom: var(--space-8);
  z-index: var(--z-beam);
  pointer-events: none;
  transition: opacity 0.3s var(--ease-interact);
}
.hero-tips__text {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
  line-height: 1.8;
}
.hero-tips__line {
  display: block;
  font-size: 12px;
}
.hero-tips__line--zh {
  font-family: var(--font-zh), var(--font-en);
  letter-spacing: 0.14em;
  color: rgba(255,255,255,0.36);
}
.hero-tips__line--en {
  font-family: var(--font-en);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.42);
}

@media (max-width: 768px) {
  .hero-tips { bottom: var(--space-6); }
}

/* ============================================================
   Hero 下部 30vh：我们做什么（深底 + 左橙竖条 + 横排业务）
   ============================================================ */
/* 下部 30vh：我们做什么 · 业务矩阵
   Phase1：初始 transform: translateY(100%) 藏在视口下方
   Phase2：加 .is-slid-up → 向上推入视口，与导航栏滑落"上下夹击"把 Hero 挤回 70vh */
.hero-lower {
  position: relative;
  z-index: var(--z-content);
  min-height: var(--hero-lower-height);
  background-color: rgba(15, 17, 21, 0.19);
  backdrop-filter: blur(11px) saturate(175%);
  -webkit-backdrop-filter: blur(11px) saturate(175%);
  border-top: 1px solid rgba(255,255,255,0.10);
  color: #fff;
  overflow: hidden;
  /* 推入动画：1500ms 与导航 & Hero 挤压严格同步起止；
     长行程用 Ease-In-Out-Sine 加强版：前25%慢慢露头蓄力→中段加速冲入→尾段顺滑冰停，不再一来就猛冲。 */
  transform: translateY(100%);
  transition: transform 1500ms cubic-bezier(0.76, 0, 0.24, 1);
  will-change: transform;
}
.hero-lower.is-slid-up { transform: translateY(0); }
.hero-lower__inner {
  min-height: var(--hero-lower-height);
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 48px;
  align-items: center;
  /* 视觉黄金点：内容中心在几何中心之上，再微调上移（上 16px / 下 64px，较上轮再上浮 8px） */
  padding-top: var(--space-4);                                  /* 16px · 上最小 */
  padding-bottom: calc(var(--space-12) + var(--space-4));       /* 64px · 下最大 */
}
.services-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin: 0;
  padding: 0;
}
.services-head__bar {
  flex: 0 0 auto;
  width: 4px;
  align-self: stretch;
  min-height: 56px;
  background: var(--color-brand);
  box-shadow: 0 0 12px rgba(255,160,0,0.4);
}
.services-head__text { display: flex; flex-direction: column; gap: 8px; }
.services-head__title {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(24px, 2.8vw, 34px);
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
  line-height: 1.1;
  margin: 0;
}
.services-head__sub {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.60);
  margin: 0;
  text-transform: uppercase;
}
.section-index {
  display: inline-block;
  font-family: var(--font-en);
  font-size: var(--text-aux-size);
  letter-spacing: 0.12em;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  font-weight: 500;
}
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-16);
  flex-wrap: wrap;
  gap: var(--space-4);
}
.section-head--center { justify-content: center; margin-bottom: var(--space-12); }
.section-head-row { display: flex; align-items: center; gap: var(--space-4); margin-bottom: var(--space-12); }
.section-more {
  font-family: var(--font-en);
  font-size: var(--text-aux-size);
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}
.section-more:hover { color: var(--color-brand); }
.news-more {
  margin-left: auto;
  font-family: var(--font-en);
  font-size: var(--text-aux-size);
  color: var(--color-text-muted);
}

/* 三列横排业务项（深底无白卡，左右分隔竖线） */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}
.service-item {
  position: relative;
  padding: var(--space-6) var(--space-8);
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: #fff;
  min-height: 140px;
}
.service-item + .service-item::before {
  content: "";
  position: absolute;
  left: 0; top: 14%;
  width: 1px;
  height: 72%;
  background: rgba(255,255,255,0.12);
}
.service-item__name {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #fff;
  line-height: 1.2;
  margin: 0;
  transition: color var(--duration-interact) var(--ease-interact);
}
.service-item__desc {
  font-size: 15px;
  color: rgba(255,255,255,0.75);
  line-height: 1.7;
  margin: 0;
}
.service-item__tags {
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  line-height: 1.7;
  margin: 6px 0 0 0;
  letter-spacing: 0.01em;
}

@media (max-width: 900px) {
  .hero-lower__inner { grid-template-columns: 1fr; gap: var(--space-6); padding-top: var(--space-3); padding-bottom: calc(var(--space-12) + var(--space-4)); min-height: auto; }
  .services-grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .service-item { padding: var(--space-4) 0; min-height: auto; }
  .service-item + .service-item::before { left: 0; right: 0; top: 0; width: auto; height: 1px; }
}
@media (max-width: 768px) {
  .hero-content { max-width: 100%; }
  .hero-scroll { bottom: calc(var(--hero-lower-height) + var(--space-6)); }
}

/* ============================================================
   02 · 精选作品 (2×2 四卡片网格)
   ============================================================ */
.works-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-12) var(--grid-gap);
}
.work-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.work-card__media {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-dark-bg-alt);
  border: 1px solid var(--color-divider);
  transition:
    box-shadow var(--duration-interact-long) var(--ease-enter),
    border-color var(--duration-interact) var(--ease-interact);
}
.work-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: filter 0.6s var(--ease-enter);
}
.work-card__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--duration-interact-long) var(--ease-enter);
}
.work-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-inline: var(--space-2);
}
.work-card__meta {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  transition: color var(--duration-interact) var(--ease-interact);
}
.work-card__title {
  font-size: 22px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.3;
  transition: color var(--duration-interact) var(--ease-interact);
}
.work-card__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}
.work-link {
  display: inline-block;
  margin-top: var(--space-2);
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--color-brand);
  align-self: flex-start;
}

@media (max-width: 768px) {
  .works-grid { grid-template-columns: 1fr; gap: var(--space-8); }
}

/* ============================================================
   03 · 多场景融入案例 (深墨底 + 透视网格 + 横向大图轮播)
   ============================================================ */
.section-showcases {
  padding-top: var(--space-40);
  padding-bottom: var(--space-40);
}
.showcases-wrap {
  position: relative;
  margin-top: var(--space-8);
}
/* 透视网格背景 */
.showcases-grid-bg {
  position: absolute;
  inset: -20% 0 -10% 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(0,168,198,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,160,0,0.04) 1px, transparent 1px);
  background-size: 60px 60px, 60px 60px;
  transform: perspective(800px) rotateX(60deg) translateY(25%);
  transform-origin: center top;
  opacity: 0.6;
  mask-image: linear-gradient(180deg, transparent 0%, #000 30%, #000 70%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 30%, #000 70%, transparent 100%);
  pointer-events: none;
}
.showcases-carousel {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--grid-margin);
}
.showcases-track {
  position: relative;
  aspect-ratio: 16 / 7;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-dark-bg-alt);
  border: 1px solid var(--color-dark-divider);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.showcase-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: scale(1.02);
  transition:
    opacity 0.8s var(--ease-enter),
    transform 0.9s var(--ease-enter);
}
.showcase-slide.is-active {
  opacity: 1;
  transform: scale(1);
}
.showcase-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.showcase-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-8) var(--space-12);
  background: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.72) 100%);
  color: var(--color-dark-text);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.showcase-caption__tag {
  display: inline-block;
  width: fit-content;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--color-cyan-light);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  background: rgba(0,168,198,0.10);
  border: 1px solid rgba(0,168,198,0.22);
}
.showcase-caption__title {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 500;
  color: #fff;
  line-height: 1.3;
}

/* 左右箭头 */
.showcases-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  line-height: 1;
  color: var(--color-dark-text);
  background: rgba(15,17,21,0.60);
  border: 1px solid rgba(255,255,255,0.10);
  backdrop-filter: blur(8px);
  z-index: 2;
  transition:
    background-color var(--duration-interact) var(--ease-interact),
    border-color var(--duration-interact) var(--ease-interact),
    box-shadow var(--duration-interact) var(--ease-interact),
    color var(--duration-interact) var(--ease-interact);
}
.showcases-arrow--prev { left: calc(var(--grid-margin) - 8px); }
.showcases-arrow--next { right: calc(var(--grid-margin) - 8px); }

/* 轮播点 */
.showcases-dots {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: var(--space-8);
}
.showcases-dot {
  width: 36px;
  height: 4px;
  background: rgba(255,255,255,0.18);
  border-radius: 2px;
  padding: 0;
  cursor: pointer;
  transition:
    background-color 0.45s var(--ease-interact),
    background-image 0.45s var(--ease-interact),
    background-position 0.6s var(--ease-enter),
    box-shadow 0.45s var(--ease-interact),
    transform 0.3s var(--ease-interact);
  background-size: 200% 200%;
  background-position: 0% 50%;
}

@media (max-width: 768px) {
  .showcases-arrow { width: 40px; height: 40px; font-size: 22px; }
  .showcases-arrow--prev { left: calc(var(--grid-margin) - 16px); }
  .showcases-arrow--next { right: calc(var(--grid-margin) - 16px); }
  .showcase-caption { padding: var(--space-6); }
  .showcases-track { aspect-ratio: 4 / 3; }
}

/* ============================================================
   04 · 关于 + 数据 (左文字右数据)
   ============================================================ */
.section-about { padding-top: var(--space-40); padding-bottom: var(--space-40); }
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-24);
  align-items: center;
  max-width: 1180px;
  margin-inline: auto;
}
.about-claim { display: flex; flex-direction: column; gap: var(--space-4); }
.about-claim-line {
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 300;
  line-height: 1.5;
  color: var(--color-dark-text);
  max-width: none;
}
.about-credentials-text {
  margin-top: var(--space-6);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--color-dark-text-secondary);
  font-family: var(--font-en);
  text-transform: uppercase;
  max-width: none;
}
.cred-sep {
  color: var(--color-cyan);
  margin-inline: 0.6em;
  opacity: 0.8;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}
.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-dark-bg-alt);
  border: 1px solid var(--color-dark-divider);
  text-align: center;
}
.stat-figure {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  line-height: 1;
  font-family: var(--font-en);
}
.stat-num {
  font-size: clamp(42px, 6vw, 64px);
  font-weight: 300;
  letter-spacing: -0.02em;
}
.stat-suffix {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 200;
  margin-right: 0.2em;
}
.stat-unit {
  font-size: clamp(14px, 1.6vw, 18px);
  font-weight: 400;
  color: var(--color-dark-text-secondary);
}
.stat-label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--color-dark-text-secondary);
  text-align: center;
}

@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; gap: var(--space-16); }
  .about-stats { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 600px) {
  .about-stats { grid-template-columns: 1fr; gap: var(--space-3); }
  .stat { flex-direction: row; align-items: center; justify-content: space-between; text-align: left; padding: var(--space-4) var(--space-6); }
  .stat-label { text-align: right; }
}

/* ============================================================
   05 · 最新动态 (三列卡片骨架)
   ============================================================ */
.section-news { position: relative; }
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}
.news-card {
  padding: var(--space-8);
  border-radius: var(--radius-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-divider);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition:
    border-color var(--duration-interact-long) var(--ease-interact),
    box-shadow var(--duration-interact-long) var(--ease-interact);
  position: relative;
  overflow: hidden;
}
.news-card__date {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.1em;
  font-weight: 500;
}
.news-card__title {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.4;
  transition: color var(--duration-interact) var(--ease-interact);
}
.news-card__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

@media (max-width: 900px) {
  .news-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   06 · 联系表单 + Footer
   ============================================================ */
.section-contact { padding-top: var(--space-40); padding-bottom: 0; }
.contact-main {
  max-width: 960px;
  margin-inline: auto;
  padding-bottom: var(--space-40);
}
.contact-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 300;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--space-8);
}
.contact-email {
  display: block;
  text-align: center;
  font-family: var(--font-en);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 400;
  letter-spacing: -0.005em;
  color: var(--color-brand);
  margin-bottom: var(--space-16);
  background-image: linear-gradient(currentColor, currentColor);
  background-position: 0 100%;
  background-size: 0 1px;
  background-repeat: no-repeat;
  transition:
    background-size 0.4s var(--ease-interact),
    color var(--duration-interact) var(--ease-interact);
}
.contact-email:hover {
  background-size: 100% 2px;
  color: var(--color-cyan);
}

/* 表单网格 */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  align-items: stretch;
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--grid-gap);
}
.form-field {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.form-field-wide {
  grid-column: 1 / -1;
}
.form-field label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}
.form-field input {
  height: 48px;
  padding: 0 14px;
  font-size: 15px;
  color: var(--color-text);
  background: var(--color-bg);
  border: none;
  border-bottom: 1.5px solid var(--color-divider);
  border-radius: 0;
  transition:
    border-color var(--duration-interact) var(--ease-interact),
    background-color var(--duration-interact) var(--ease-interact);
}
.form-field input::placeholder {
  color: var(--color-text-muted);
}
.form-field input:focus {
  border-bottom-color: var(--color-brand);
  background: var(--color-bg-alt);
}
/* 扫光条 (底部) — 由 interactions.css 控制动画 */
.form-field__sweep {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
  border-radius: 0 0 2px 2px;
  transition: transform 0s;
}
/* 邮箱输入校验状态标识 (右侧✔或✖光点) */
.form-field__status {
  position: absolute;
  right: 14px;
  bottom: 14px;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s var(--ease-enter);
}

/* 提交按钮 */
.contact-submit {
  position: relative;
  align-self: flex-end;
  width: auto;
  min-width: 160px;
  height: 50px;
  padding: 0 36px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #0b0d10;
  background: linear-gradient(135deg, var(--color-brand-light) 0%, var(--color-brand) 55%, var(--color-brand-deep) 100%);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.35),
    0 8px 24px rgba(255,160,0,0.22);
  overflow: hidden;
  cursor: pointer;
  transition:
    background 0.4s var(--ease-sweep),
    color 0.4s var(--ease-sweep),
    box-shadow 0.5s var(--ease-enter),
    transform var(--duration-interact) var(--ease-interact);
}
.contact-submit:disabled {
  cursor: not-allowed;
}
.contact-submit__label {
  position: relative;
  z-index: 2;
}
/* 提交时的扫光进度条 (按钮内部) */
.contact-submit__sweep {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(255,255,255,0.28) 50%,
    transparent 100%);
  transform: translateX(-100%);
  pointer-events: none;
  transition: transform 0s;
}

@media (max-width: 640px) {
  .form-grid { grid-template-columns: 1fr; }
  .contact-submit { align-self: stretch; width: 100%; }
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-16);
  padding-bottom: var(--space-12);
  background: var(--color-bg);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.4fr;
  gap: var(--space-16);
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-4);
}
.footer-col p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: none;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.footer-col ul li a {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color var(--duration-interact) var(--ease-interact);
}
.footer-col ul li a:hover { color: var(--color-brand); }
.footer-col--brand { text-align: right; }
.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.footer-logo {
  height: 36px;
  width: auto;
  opacity: 0.9;
  filter: none;
}
.footer-brand-name {
  font-size: 13px;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}
.footer-copyright {
  font-size: 12px;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  max-width: none;
  text-align: right;
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-12); }
  .footer-col--brand { grid-column: 1 / -1; text-align: left; }
  .footer-brand { align-items: flex-start; }
  .footer-copyright { text-align: left; }
}
@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-8); }
}

/* ============================================================
   减少动效：Hero 开场全部简化 (prefers-reduced-motion)
   · 无 100vh→70vh 挤压过渡、无导航/业务区位移
   · 所有入场文字 / LOGO / 导航 / hero-lower 直接显示最终态
   · Shader 在 JS 层也已跳过入场光动画（直接 bright=1 居中）
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .nav { transform: none !important; transition: none !important; pointer-events: auto !important; }
  .hero {
    height: var(--hero-total-height) !important;
    min-height: var(--hero-total-height) !important;
    transition: none !important;
  }
  .hero-upper,
  .hero-inner {
    min-height: var(--hero-upper-height) !important;
    transition: none !important;
  }
  .hero-content,
  .hero-logo-wrap,
  .hero-logo,
  .hero-title { transition: none !important; }
  .hero-content    { top: calc((var(--nav-height) + var(--hero-upper-height)) / 2) !important; }
  .hero-logo-wrap  { top: calc((var(--nav-height) + var(--hero-upper-height)) / 2) !important; opacity: 0.72 !important; }
  .hero-logo       { height: clamp(var(--hero-logo-min), var(--hero-logo-preferred), var(--hero-logo-max)) !important; }
  .hero-title      { font-size: clamp(38px, 7vw, 82px) !important; }
  .hero-lower { transform: none !important; transition: none !important; }

  .hero-eyebrow, .hero-sub, .hero-actions { opacity: 1 !important; transform: none !important; filter: none !important; }
  .hero-title { opacity: 1 !important; transform: none !important; filter: none !important; }
  .word       { opacity: 1 !important; filter: none !important; }
}