/* ===== about (extracted from about.html) ===== */
/* ============================================================ 01 · TOKENS */
:root{
  --bg-900:#FFFFFF;          /* 主体白 */
  --bg-800:#F5F7F6;          /* 交替浅灰带 */
  --bg-700:#FFFFFF;          /* 卡片面 */
  --bg-600:#EDF1EF;          /* 图标占位 / hover */

  --brand:#264F47;
  --brand-lit:#2F6159;
  --brand-deep:#1B3A34;
  --brand-lift:#5A9E90;

  /* 浅色底专用文字色；--silver/--white/--muted 继续留给深色区使用 */
  --ink:#0F1714;             /* 浅底主文字，近黑 */
  --ink-2:#5B6863;           /* 浅底次文字 */
  --ink-3:#8A9691;           /* 浅底弱文字 */
  --accent:#2F6159;          /* 浅底品牌强调 */
  --brand-on-dark:#5A9E90;   /* 深色区品牌强调 */

  --silver:#C9C9C9;
  --white:#F5F7F6;
  --muted:#A8B5B0;

  --line-1:rgba(15,23,20,.08);
  --line-2:rgba(15,23,20,.14);
  --line-3:rgba(15,23,20,.26);

  --line-dark-1:rgba(201,201,201,.10);
  --line-dark-2:rgba(201,201,201,.20);

  --plate:#FFFFFF;
  --plate-ink:#0F1714;
  --plate-muted:#5B6863;

  --dark:#0B1512;            /* 顶栏 / 页脚 */

  --ph:#E8ECEA;              /* 图片占位底色 */

  --sans:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;
  --display:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;
  --num:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;

  --shell:1240px;
  --gut:clamp(20px,4.2vw,44px);
  --sect:clamp(84px,8.6vw,150px);
  --nav-h:76px;

  --r-xs:8px;
  --r-sm:14px;
  --r:24px;
  --r-lg:32px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-out:cubic-bezier(.16,1,.3,1);
  --ease-soft:cubic-bezier(.4,0,.2,1);
}

/* ============================================================= 02 · RESET */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-900);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  font-weight:400;
  line-height:1.62;
  letter-spacing:.004em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,video,svg{display:block;max-width:100%}
img{height:auto}
a{color:inherit;text-decoration:none}
button,input{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
em{font-style:normal}
address{font-style:normal}
::selection{background:var(--brand);color:#FFFFFF}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}

.shell{width:100%;max-width:none;margin-inline:auto;padding-inline:var(--gut)}
@media (min-width:1440px){.shell{width:85vw}}
.idx-visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:var(--gut);top:-70px;z-index:200;padding:12px 20px;border-radius:var(--r-xs);background:var(--dark);color:#FFFFFF;font-weight:500;transition:top .3s var(--ease)}
.skip:focus{top:14px}

/* ========================================================== 03 · CONTROL */
.index-progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:120;pointer-events:none}
.index-progress i{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--brand-deep) 0%,var(--brand) 46%,var(--brand-lift) 100%);will-change:transform}

/* ============================================================= 04 · TYPE */
.index-head{max-width:760px}
.index-head--center{margin-inline:auto;text-align:center}
.index-head__label{display:inline-flex;align-items:center;gap:11px;font-family:var(--num);font-weight:600;
  font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--accent)}
.index-head__label::before{content:'';width:24px;height:1px;background:currentColor;flex:none}
.index-head__title{margin-top:22px;font-family:var(--display);font-weight:700;
  font-size:clamp(2rem,4.3vw,3.35rem);line-height:1.06;letter-spacing:-.025em;color:var(--ink)}
.index-head__title em{font-weight:500;color:var(--accent);letter-spacing:-.01em;padding-inline:.04em}
.index-head__sub{margin-top:18px;max-width:60ch;font-size:1.0625rem;color:var(--ink-2)}

/* =========================================================== 05 · BUTTON */
.idx-btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:54px;padding:0 30px;border-radius:999px;overflow:hidden;isolation:isolate;
  font-family:var(--sans);font-weight:500;font-size:.9375rem;letter-spacing:.012em;white-space:nowrap;
  transition:transform .5s var(--ease-out),box-shadow .5s var(--ease),background-color .35s var(--ease),
             border-color .35s var(--ease),color .35s var(--ease)}
.idx-btn span{position:relative;z-index:2;display:inline-flex;align-items:center;gap:10px}
.idx-btn span::after{content:'';position:absolute;left:0;right:0;bottom:-3px;height:1px;background:currentColor;
  transform:scaleX(0);transform-origin:0 50%;opacity:.7;transition:transform .5s var(--ease-out)}
.idx-btn:hover span::after{transform:scaleX(1)}
.idx-btn::before{content:'';position:absolute;inset:0;z-index:1;border-radius:inherit;
  background:linear-gradient(105deg,transparent 32%,rgba(255,255,255,.16) 48%,transparent 64%);
  transform:translateX(-120%);transition:transform .9s var(--ease-out)}
.idx-btn:hover::before{transform:translateX(120%)}
.idx-btn:active{transform:scale(.98)}

.idx-btn--brand{background:var(--brand);color:#FFFFFF;
  box-shadow:0 10px 24px -16px rgba(38,79,71,.75)}
.idx-btn--brand:hover{background:var(--brand-lit);
  box-shadow:0 18px 40px -16px rgba(38,79,71,.8),0 0 0 1px rgba(38,79,71,.22)}

.idx-btn--ghost{border:1px solid var(--line-3);color:var(--ink)}
.idx-btn--ghost:hover{border-color:var(--brand);background:rgba(38,79,71,.06);
  box-shadow:0 12px 28px -18px rgba(38,79,71,.5)}

.idx-btn--light{background:var(--dark);color:#FFFFFF}
.idx-btn--light:hover{background:#17241F;box-shadow:0 18px 40px -20px rgba(15,23,20,.55)}

/* 深色区（顶栏 / 大 banner）上的描边按钮走浅色，避免深字压深底 */
.index-nav .idx-btn--ghost{border-color:var(--line-dark-2);color:#FFFFFF}
.index-nav .idx-btn--ghost:hover{border-color:#FFFFFF;background:rgba(245,247,246,.12);box-shadow:none}

.idx-btn--sm{min-height:44px;padding:0 22px;font-size:.875rem}

/* ============================================================== 06 · NAV */
.index-nav{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--nav-h);display:flex;align-items:center}
.index-nav__bg{position:absolute;inset:0;background:rgba(11,21,18,.94);
  -webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
  border-bottom:1px solid var(--line-dark-2);opacity:1;transition:opacity .45s var(--ease)}
.index-nav.is-scrolled .index-nav__bg{opacity:1;background:var(--dark)}
.index-nav__in{position:relative;z-index:1;width:100%;max-width:none;margin-inline:auto;
  padding-inline:var(--gut);display:flex;align-items:center;gap:28px}
@media (min-width:1440px){.index-nav__in{width:85vw}}
.index-brand{display:flex;align-items:center;gap:13px;flex:none}
.index-brand img{height:32px;width:auto}
.index-brand__txt{display:flex;flex-direction:column;line-height:1.06}
.index-brand__txt b{font-family:var(--display);font-weight:700;font-size:.98rem;letter-spacing:.09em;color:var(--white)}
.index-brand__txt i{font-family:var(--num);font-weight:600;font-size:.66rem;letter-spacing:.42em;
  text-transform:uppercase;color:var(--brand-on-dark);padding-left:.1em}
.index-nav__links{display:flex;align-items:center;gap:6px;margin-left:auto}
.index-nav__links a{position:relative;padding:9px 15px;border-radius:999px;font-size:.9rem;font-weight:400;
  color:var(--muted);transition:color .3s var(--ease),background-color .3s var(--ease)}
.index-nav__links a::after{content:'';position:absolute;left:15px;right:15px;bottom:4px;height:1px;
  background:#FFFFFF;transform:scaleX(0);transform-origin:0 50%;transition:transform .42s var(--ease-out)}
.index-nav__links a:hover{color:#FFFFFF}
.index-nav__links a:hover::after,.index-nav__links a.is-active::after{transform:scaleX(1)}
.index-nav__links a.is-active{color:#FFFFFF}
.index-nav__act{display:flex;align-items:center;gap:12px;flex:none}

.index-burger{display:none;width:46px;height:46px;border:1px solid var(--line-dark-2);border-radius:var(--r-sm);
  position:relative;transition:border-color .3s var(--ease),background-color .3s var(--ease)}
.index-burger:hover{border-color:#FFFFFF;background:rgba(201,201,201,.12)}
.index-burger i{position:absolute;left:50%;width:18px;height:1.4px;margin-left:-9px;background:#FFFFFF;
  border-radius:2px;transition:transform .45s var(--ease-out),opacity .3s var(--ease)}
.index-burger i:nth-child(1){top:19px}
.index-burger i:nth-child(2){top:25px}
.is-menu .index-burger i:nth-child(1){transform:translateY(3px) rotate(45deg)}
.is-menu .index-burger i:nth-child(2){transform:translateY(-3px) rotate(-45deg)}

.index-drawer{position:fixed;inset:0;z-index:99;background:rgba(11,21,18,.97);
  -webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);display:flex;flex-direction:column;
  justify-content:center;padding:calc(var(--nav-h) + 24px) var(--gut) 42px;
  opacity:0;visibility:hidden;transition:opacity .45s var(--ease),visibility .45s}
.index-drawer[hidden]{display:none}
.is-menu .index-drawer{opacity:1;visibility:visible}
.index-drawer nav{display:flex;flex-direction:column}
.index-drawer a{font-family:var(--display);font-weight:700;font-size:clamp(1.9rem,8vw,2.8rem);
  letter-spacing:-.02em;color:#FFFFFF;padding:16px 0;border-bottom:1px solid var(--line-dark-1);
  opacity:0;transform:translateY(22px);transition:opacity .6s var(--ease-out),transform .6s var(--ease-out),color .3s}
.is-menu .index-drawer a{opacity:1;transform:none;transition-delay:calc(var(--i,0)*70ms + 90ms)}
.index-drawer a:hover{color:var(--brand-on-dark)}
.index-drawer__foot{margin-top:34px;display:flex;flex-direction:column;gap:8px;color:var(--muted);font-size:.875rem}
.index-drawer__foot a{font-family:var(--sans);font-weight:400;font-size:.9375rem;border:0;padding:0;color:var(--brand-on-dark)}

/* ============================================================== 10 · ABOUT */
/* --- 首屏标题区：纯白底，标签 + 大标题 + 副标题 --- */
.about-hero{padding:calc(var(--nav-h) + clamp(52px,6.4vw,92px)) 0 clamp(44px,5.4vw,68px);background:var(--bg-900)}
.about-hero .index-head{max-width:none}

/* --- 图片占位原子件 --- */
.about-ph{display:flex;align-items:center;justify-content:center;background:var(--ph);
  color:var(--ink-3);font-family:var(--num);font-weight:600;font-size:.8rem;letter-spacing:.2em;
  text-align:center;padding:20px}

/* --- 公司简介：1.2fr / 0.8fr 两列 --- */
.about-intro{padding:0 0 var(--sect);background:var(--bg-900)}
.about-intro__in{display:grid;grid-template-columns:1fr;
  gap:clamp(28px,4vw,40px)}
.about-intro__ph{aspect-ratio:16 / 9;border-radius:var(--r-lg);overflow:hidden;
  width:100%}
.about-intro__ph img{width:100%;height:100%;object-fit:cover;display:block}
.about-intro__body{display:grid;gap:clamp(16px,1.8vw,22px);width:100%}
.about-intro__body{display:grid;gap:clamp(16px,1.8vw,22px)}
.about-intro__body p{font-size:1.06rem;line-height:1.8;color:var(--ink)}

/* --- 数据条：浅灰底四列 --- */
.about-stats{padding:var(--sect) 0;background:linear-gradient(100deg,rgba(38,79,71,.12) 0%,rgba(38,79,71,.03) 100%)}
.about-stats__grid{margin-top:clamp(38px,4.4vw,60px);display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(26px,3vw,40px)}
.about-stat{padding-top:22px;border-top:1px solid var(--line-2)}
.about-stat__num{display:flex;align-items:baseline;gap:2px;font-family:var(--num);font-variant-numeric:tabular-nums;
  font-weight:700;font-size:clamp(2.4rem,4.4vw,3.6rem);line-height:1;letter-spacing:-.03em;color:var(--ink)}
.about-stat__unit{font-weight:600;font-size:1.15rem;letter-spacing:0;color:var(--accent)}
.about-stat__label{margin-top:14px;font-size:.86rem;letter-spacing:.06em;color:var(--ink-2)}

/* --- 能力网格：白底三列六卡 --- */
.about-caps{padding:var(--sect) 0;background:linear-gradient(180deg,#2c5a52 0%,#264F47 100%)}
.about-caps .index-head__label{color:rgba(255,255,255,.82)}
.about-caps .index-head__title{color:#FFFFFF}
.about-caps__grid{margin-top:clamp(40px,4.8vw,64px);display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,2vw,26px)}
.about-cap{display:flex;flex-direction:column;gap:16px;padding:clamp(26px,3vw,36px);
  background:#FFFFFF;border:1px solid var(--line-1);border-radius:var(--r);
  transition:border-color .4s var(--ease),box-shadow .45s var(--ease),transform .45s var(--ease-out)}
.about-cap:hover{border-color:var(--line-3);box-shadow:0 24px 48px -32px rgba(15,23,20,.28);transform:translateY(-4px)}
.about-cap__ic{width:44px;height:44px;border-radius:var(--r-xs);flex:none;
  display:flex;align-items:center;justify-content:center;
  background:rgba(38,79,71,.05);border:1px solid rgba(38,79,71,.18);color:var(--brand);
  transition:background-color .4s var(--ease),border-color .4s var(--ease),color .4s var(--ease)}
.about-cap__ic svg{width:22px;height:22px;display:block;fill:currentColor;stroke:none;
  stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.about-cap:hover .about-cap__ic{background:var(--brand);border-color:var(--brand);color:#FFFFFF}
.about-cap__t{font-family:var(--display);font-weight:700;font-size:1.12rem;letter-spacing:-.01em;color:var(--ink)}
.about-cap__d{font-size:.92rem;line-height:1.66;color:var(--ink-2)}

/* --- 工厂展示：16:9 占位 + 居中文案 --- */
.about-factory{padding:var(--sect) 0;background:var(--bg-900)}
.about-factory__ph{aspect-ratio:16 / 9;border-radius:var(--r-lg)}
.about-factory__note{margin:clamp(28px,3.4vw,44px) auto 0;max-width:64ch;text-align:center;
  font-size:1.0625rem;line-height:1.72;color:var(--ink-2)}
.about-factory__note strong{font-weight:600;color:var(--ink)}

/* --- 价值观：浅灰底三列 --- */
.about-values{padding:var(--sect) 0;background:var(--bg-800)}
.about-values__grid{margin-top:clamp(40px,4.8vw,64px);display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(28px,3.2vw,44px)}
.about-value__head{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.about-value__ic{width:44px;height:44px;border-radius:var(--r-xs);flex:none;display:flex;align-items:center;justify-content:center;
  background:rgba(38,79,71,.05);border:1px solid rgba(38,79,71,.18);color:var(--brand);
  transition:background-color .4s var(--ease),border-color .4s var(--ease),color .4s var(--ease)}
.about-value__ic svg{width:22px;height:22px;display:block;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.has-js .about-value.is-in:hover .about-value__ic{background:var(--brand);border-color:var(--brand);color:#FFFFFF}
.about-value__t{font-family:var(--display);font-weight:700;font-size:1.1rem;letter-spacing:-.01em;color:var(--ink)}
.about-value__d{margin-top:0;font-size:.94rem;line-height:1.7;color:var(--ink-2)}

/* --- 底部 CTA：居中胶囊按钮 --- */
.about-cta{padding:var(--sect) 0;background:var(--bg-900)}
.about-cta__in{display:flex;flex-direction:column;align-items:center;gap:clamp(26px,3vw,36px);text-align:center}
.about-cta__t{max-width:24ch;font-family:var(--display);font-weight:700;
  font-size:clamp(1.7rem,3.4vw,2.5rem);line-height:1.14;letter-spacing:-.02em;color:var(--ink)}
.about-cta__btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:16px 36px;
  border-radius:999px;background:var(--brand);color:#FFFFFF;font-weight:500;font-size:.9375rem;letter-spacing:.02em;
  box-shadow:0 10px 24px -16px rgba(38,79,71,.75);
  transition:background-color .35s var(--ease),box-shadow .45s var(--ease),transform .45s var(--ease-out)}
.about-cta__btn:hover{background:var(--brand-lit);transform:translateY(-2px);
  box-shadow:0 18px 40px -16px rgba(38,79,71,.65)}
.about-cta__btn:active{transform:translateY(0) scale(.98)}
.about-cta__btn svg{width:15px;height:15px;fill:currentColor;stroke:none;stroke-width:1.7;
  transition:transform .45s var(--ease-out)}
.about-cta__btn:hover svg{transform:translateX(4px)}

/* ========================================================== 14 · FOOTER */
.index-footer{position:relative;background:var(--dark);border-top:1px solid var(--line-dark-1);
  padding:clamp(64px,7vw,104px) 0 34px;scroll-margin-top:var(--nav-h)}
.index-footer__top{display:grid;grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));
  gap:clamp(34px,4vw,58px)}
.index-footer__brand{display:flex;align-items:center;gap:13px}
.index-footer__brand img{height:40px;width:auto}
.index-footer__brand b{font-family:var(--display);font-weight:700;font-size:1.16rem;letter-spacing:.1em;color:var(--white)}
.index-footer__brand i{display:block;font-family:var(--num);font-weight:600;font-size:.66rem;letter-spacing:.42em;
  text-transform:uppercase;color:var(--brand-lift);padding-left:.1em;margin-top:2px}
.index-footer__desc{margin-top:22px;max-width:38ch;font-size:.92rem;line-height:1.72;color:var(--muted)}
.index-social{margin-top:26px;display:flex;gap:10px}
.index-social a{display:flex;width:42px;height:42px;align-items:center;justify-content:center;
  border:1px solid var(--line-dark-2);border-radius:var(--r-xs);color:var(--muted);
  transition:color .35s var(--ease),border-color .35s var(--ease),background-color .35s var(--ease),transform .45s var(--ease-out)}
.index-social a:hover{color:#FFFFFF;border-color:rgba(201,201,201,.45);background:rgba(201,201,201,.10);transform:translateY(-3px)}
.index-social svg{width:18px;height:18px;fill:currentColor;stroke:none;stroke-width:1.35;
  stroke-linecap:round;stroke-linejoin:round}
.index-footer h4{font-family:var(--num);font-weight:600;font-size:.72rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--brand-on-dark)}
.index-footer__links{margin-top:20px;display:grid;gap:12px}
.index-footer__links a{font-size:.92rem;color:var(--muted);transition:color .3s var(--ease),transform .4s var(--ease-out);
  display:inline-block}
.index-footer__links a:hover{color:var(--silver);transform:translateX(4px)}
.index-footer__links li{display:flex}
.index-footer address{margin-top:20px;display:grid;gap:12px;font-size:.92rem;color:var(--muted)}
.index-footer address a{color:var(--silver);transition:color .3s var(--ease)}
.index-footer address a:hover{color:var(--white)}
.index-footer__note{margin-top:20px;font-size:.78rem;line-height:1.6;color:rgba(168,181,176,.72)}
.index-footer__bot{margin-top:clamp(46px,5vw,70px);padding-top:26px;border-top:1px solid var(--line-dark-1);
  display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
  font-size:.82rem;color:var(--muted)}
.index-footer__bot ul{display:flex;gap:22px;flex-wrap:wrap}
.index-footer__bot a{transition:color .3s var(--ease)}
.index-footer__bot a:hover{color:var(--silver)}
.index-top{display:inline-flex;align-items:center;gap:9px;transition:color .3s var(--ease)}
.index-top svg{width:14px;height:14px;fill:currentColor;stroke:none;stroke-width:1.6;transition:transform .4s var(--ease-out)}
.index-top:hover{color:var(--silver)}
.index-top:hover svg{transform:translateY(-3px)}

/* ========================================================== 16 · MOTION */
.has-js [data-reveal]{opacity:0;transform:translateY(26px);
  transition:opacity .95s var(--ease-out),transform .95s var(--ease-out);
  transition-delay:calc(var(--i,0) * 78ms)}
.has-js [data-reveal].is-in{opacity:1;transform:none}
.has-js [data-reveal="rise"]{transform:translateY(40px) scale(.985)}
/* values hover：三列悬浮上浮（特异性盖过 is-in 的 transform:none，并覆盖入场过渡使其跟手） */
.has-js .about-value.is-in:hover{transform:translateY(-4px);
  transition:transform .45s cubic-bezier(.16,1,.3,1);transition-delay:0s}

.has-js .index-head__title{clip-path:inset(-9% 0 108% 0);transition:clip-path 1.05s var(--ease-out)}
.has-js .index-head.is-in .index-head__title,.has-js .index-head__title.is-in{clip-path:inset(-9% 0 -12% 0)}

/* --- floating back-to-top --- */
.idx-totop{position:fixed;right:clamp(16px,2.4vw,30px);bottom:clamp(16px,2.4vw,30px);z-index:110;
  width:48px;height:48px;border:0;padding:0;background:none;cursor:pointer;display:grid;place-items:center;
  opacity:0;transform:translateY(14px) scale(.92);pointer-events:none;
  filter:drop-shadow(0 10px 22px rgba(15,23,20,.18));
  transition:opacity .5s var(--ease-out),transform .5s var(--ease-out)}
.idx-totop.is-on{opacity:1;transform:none;pointer-events:auto}
.idx-totop__ring{position:absolute;inset:0;width:100%;height:100%;transform:rotate(-90deg)}
.idx-totop__bg{fill:rgba(255,255,255,.94);stroke:var(--line-2);stroke-width:2;transition:fill .3s var(--ease)}
.idx-totop__fg{fill:none;stroke:var(--accent);stroke-width:2;stroke-linecap:round;
  stroke-dasharray:125.66;stroke-dashoffset:125.66;transition:stroke-dashoffset .12s linear}
.idx-totop__arw{position:relative;width:18px;height:18px;stroke:var(--accent);fill:none;
  stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;transition:transform .4s var(--ease-out)}
.idx-totop:hover .idx-totop__bg{fill:#fff}
.idx-totop:hover .idx-totop__arw{transform:translateY(-2px)}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .has-js [data-reveal],.has-js .index-head__title{opacity:1 !important;transform:none !important;
    clip-path:none !important;transition:none !important}
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
}

/* ====================================================== 17 · BREAKPOINTS */
@media (max-width:1200px){
  :root{--shell:1080px}
  .index-head__title{font-size:clamp(1.9rem,4vw,2.9rem)}
}

@media (max-width:992px){
  :root{--nav-h:70px;--sect:clamp(74px,8vw,104px)}
  .index-nav__links,.index-nav__act .idx-btn{display:none}
  .index-burger{display:block}
  /* 简介 / 数据条 / 能力网格 / 价值观 → 单列 */
  .about-intro__in{grid-template-columns:minmax(0,1fr);gap:clamp(28px,4vw,40px)}
  .about-stats__grid{grid-template-columns:minmax(0,1fr)}
  .about-caps__grid{grid-template-columns:minmax(0,1fr)}
  .about-values__grid{grid-template-columns:minmax(0,1fr)}
  .index-footer__top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .index-footer__brandcol{grid-column:1 / -1}
}

@media (max-width:768px){
  :root{--nav-h:66px}
  body{font-size:15.5px}
  .about-hero{padding-top:calc(var(--nav-h) + 44px)}
  .index-footer__top{grid-template-columns:minmax(0,1fr)}
  .index-footer__brandcol{grid-column:auto}
  .index-footer__bot{flex-direction:column;align-items:flex-start}
}