/* ============================================================
   月阶科技 Moonstep AI · 企业官网（精修版）
   氛围：月蚀 / 银盐 / 墨夜（右下角可切换）
   所有文案均为演示占位内容，正式上线前请替换为真实信息。
   ============================================================ */
:root{
  --font: -apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue","PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --font-display: "Songti SC","STSong","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --container: 1160px;
  --radius: 6px;
  --radius-sm: 4px;
  --header-h: 64px;
  --ease: cubic-bezier(.2,.6,.2,1);
}

/* ---------- 氛围一：月蚀 · 暖金 ---------- */
body[data-theme="deep"]{
  --bg:#0a0c12;
  --bg-2:#11141f;
  --bg-3:#181d2b;
  --surface:#11141e;
  --surface-2:#171b27;
  --border:#262b3a;
  --border-strong:#414860;
  --text:#f1ede2;
  --muted:#a29c92;
  --faint:#6f6a62;
  --accent:#d8b26e;
  --accent-2:#8fa3c4;
  --accent-soft:#1c2029;
  --btn-bg:#f1ede2;
  --btn-text:#0a0c12;
  --nav-bg:rgba(10,12,18,.78);
  --hero-tint:rgba(216,178,110,.07);
  --shadow:0 1px 2px rgba(0,0,0,.5),0 18px 46px rgba(0,0,0,.42);
  --grid-line:rgba(241,237,226,.04);
  --aur-a:rgba(143,163,196,.30);
  --aur-b:rgba(216,178,110,.16);
  --aur-c:rgba(82,94,150,.26);
  --aur-blend:screen;
  --aur-opacity:.75;
  --moon-face:radial-gradient(circle at 32% 27%, #fdfaf2 0%, #ebe4d4 16%, #c8bda2 34%, #8b8170 55%, #49433a 76%, #171512 100%);
  --moon-halo:rgba(222,202,160,.16);
  --star-opacity:.85;
  --watermark:rgba(241,237,226,.07);
  --card-glow:rgba(216,178,110,.07);
  --moon-filter:saturate(.92) contrast(1.07) brightness(1.14) sepia(.06) hue-rotate(-4deg);
  --moon-tint:radial-gradient(circle at 30% 26%, rgba(255,241,214,.16), transparent 56%),radial-gradient(circle at 72% 76%, rgba(20,18,32,.20), transparent 70%);
  --moon-blend:overlay;
}

/* ---------- 氛围二：银盐 · 纸白 ---------- */
body[data-theme="light"]{
  --bg:#f5f4f0;
  --bg-2:#ecebe5;
  --bg-3:#e3e1d8;
  --surface:#fbfaf6;
  --surface-2:#f0efe9;
  --border:#d9d6cb;
  --border-strong:#b6b2a3;
  --text:#191a1d;
  --muted:#5f6058;
  --faint:#989589;
  --accent:#1f5f63;
  --accent-2:#c9a05e;
  --accent-soft:#e4ecea;
  --btn-bg:#191a1d;
  --btn-text:#f5f4f0;
  --nav-bg:rgba(245,244,240,.82);
  --hero-tint:rgba(31,95,99,.05);
  --shadow:0 1px 2px rgba(25,25,20,.05),0 14px 34px rgba(25,25,20,.08);
  --grid-line:rgba(25,25,20,.05);
  --aur-a:rgba(31,95,99,.10);
  --aur-b:rgba(201,160,94,.10);
  --aur-c:rgba(140,150,170,.08);
  --aur-blend:multiply;
  --aur-opacity:.5;
  --moon-face:radial-gradient(circle at 34% 30%, #ffffff 0%, #efede4 24%, #d3cfc0 50%, #9d9888 78%, #5d5a4e 100%);
  --moon-halo:rgba(25,25,20,.08);
  --star-opacity:.35;
  --watermark:rgba(25,25,20,.06);
  --card-glow:rgba(31,95,99,.05);
  --moon-filter:saturate(.4) contrast(1.16) brightness(.98);
  --moon-tint:radial-gradient(circle at 32% 28%, rgba(255,255,255,.35), transparent 56%),linear-gradient(120deg, rgba(31,95,99,.10), rgba(201,160,94,.12));
  --moon-blend:multiply;
}

/* ---------- 氛围三：墨夜 · 雾蓝 ---------- */
body[data-theme="neon"]{
  --bg:#071016;
  --bg-2:#0c1822;
  --bg-3:#122433;
  --surface:#0b141c;
  --surface-2:#101b25;
  --border:#20323d;
  --border-strong:#38515f;
  --text:#e7edf1;
  --muted:#94a3ac;
  --faint:#66757f;
  --accent:#7fb3c9;
  --accent-2:#b7d9e6;
  --accent-soft:#142630;
  --btn-bg:#e7edf1;
  --btn-text:#071016;
  --nav-bg:rgba(7,16,22,.78);
  --hero-tint:rgba(127,179,201,.06);
  --shadow:0 1px 2px rgba(0,0,0,.5),0 18px 46px rgba(0,0,0,.42);
  --grid-line:rgba(231,237,241,.04);
  --aur-a:rgba(47,120,150,.34);
  --aur-b:rgba(183,217,230,.12);
  --aur-c:rgba(45,80,140,.30);
  --aur-blend:screen;
  --aur-opacity:.8;
  --moon-face:radial-gradient(circle at 32% 27%, #f2fbfe 0%, #cfe8f0 16%, #93b8c8 36%, #54788c 58%, #253d4b 80%, #0a1218 100%);
  --moon-halo:rgba(160,210,230,.16);
  --star-opacity:.9;
  --watermark:rgba(231,237,241,.06);
  --card-glow:rgba(127,179,201,.07);
  --moon-filter:saturate(.55) hue-rotate(165deg) brightness(1.06) contrast(1.02);
  --moon-tint:radial-gradient(circle at 32% 28%, rgba(220,244,252,.18), transparent 56%),linear-gradient(200deg, rgba(30,80,110,.22), rgba(7,16,22,.2));
  --moon-blend:screen;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px)}
html.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
html.js .reveal.in{opacity:1;transform:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  html.js .reveal{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  transition:background .3s,color .3s;
}
img,svg,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
input,select,textarea{font-family:inherit;font-size:.95rem;color:inherit}
.container{width:min(var(--container),calc(100% - 48px));margin-inline:auto}
.section{padding:104px 0;position:relative;overflow:hidden}
.section[data-num]::before{
  content:attr(data-num);
  position:absolute;top:64px;left:calc(50% - min(var(--container),100%)/2 - 8px);
  transform:translate(-100%,var(--gy,0px));
  font-family:var(--font-display);font-size:clamp(4rem,9vw,8rem);line-height:1;font-weight:700;
  color:transparent;-webkit-text-stroke:1px var(--watermark);letter-spacing:.04em;
  pointer-events:none;user-select:none;will-change:transform;
}
.section-alt{background:linear-gradient(180deg,var(--bg),var(--bg-2) 18%,var(--bg) 92%);border-top:1px solid var(--border);border-bottom:1px solid var(--border);position:relative;overflow:hidden}
.section-alt::after{
  content:"";position:absolute;left:-20%;top:-30%;width:70%;height:120%;pointer-events:none;
  background:radial-gradient(closest-side,var(--aur-a),transparent 75%);
  opacity:.35;filter:blur(60px);mix-blend-mode:var(--aur-blend);
}
.grain{
  position:fixed;inset:-50%;z-index:2000;pointer-events:none;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:grainShift 1.2s steps(4) infinite;
}
@keyframes grainShift{
  0%{transform:translate(0,0)}25%{transform:translate(-2%,1%)}50%{transform:translate(1%,-2%)}75%{transform:translate(-1%,2%)}100%{transform:translate(0,0)}
}

/* ---------- 原生鼠标（自定义光标已移除） ---------- */

/* ---------- 顶部导航 ---------- */
.site-header{
  position:fixed;inset:0 0 auto;z-index:900;height:var(--header-h);
  background:var(--nav-bg);border-bottom:1px solid var(--border);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  transition:transform .4s var(--ease),box-shadow .3s,background .3s;
}
.site-header.pinned-out{transform:translateY(-100%)}
.site-header.scrolled{box-shadow:0 1px 0 var(--border),0 10px 30px rgba(0,0,0,.12)}
.scroll-progress{position:absolute;left:0;bottom:-1px;width:100%;height:2px;pointer-events:none}
.scroll-progress i{display:block;height:100%;background:var(--accent);transform:scaleX(0);transform-origin:left}
.nav{height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:11px;font-weight:650;font-size:.98rem;letter-spacing:.01em}
.logo-mark{
  width:34px;height:34px;border-radius:6px;background:var(--btn-bg);color:var(--btn-text);
  display:grid;place-items:center;flex:none;
}
.logo-mark svg{width:21px;height:21px}
.brand small{display:block;font-size:.6rem;font-weight:600;letter-spacing:.28em;color:var(--muted);margin-top:1px}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  position:relative;padding:9px 14px;font-size:.9rem;font-weight:500;color:var(--muted);
  transition:color .2s;
}
.nav-links a:hover{color:var(--text)}
.nav-links a.active{color:var(--text)}
.nav-links a.active::after{content:"";position:absolute;left:14px;right:14px;bottom:2px;height:1px;background:var(--accent)}
.nav-actions{display:flex;align-items:center;gap:10px}
.btn{
  position:relative;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 20px;border-radius:4px;font-weight:600;font-size:.86rem;
  transition:background .25s,color .25s,border-color .25s,opacity .25s,transform .25s var(--ease);
  border:1px solid transparent;white-space:nowrap;overflow:hidden;isolation:isolate;
}
.btn svg{width:15px;height:15px;flex:none;transition:transform .3s var(--ease)}
.btn:hover svg{transform:translateX(3px)}
.btn-primary{background:var(--btn-bg);color:var(--btn-text)}
.btn-primary::before{
  content:"";position:absolute;inset:0;z-index:-1;background:var(--accent);
  transform:translateY(101%);transition:transform .35s var(--ease);
}
.btn-primary:hover{color:var(--accent-ink,#0a0c12)}
.btn-primary:hover::before{transform:none}
.btn-ghost{border-color:var(--border-strong);color:var(--text);background:transparent}
.btn-ghost:hover{border-color:var(--text)}
.btn-sm{padding:8px 16px;font-size:.84rem}
.btn-lg{padding:13px 26px;font-size:.92rem}
.btn-block{width:100%}
.btn .spinner{
  display:none;width:14px;height:14px;border-radius:50%;flex:none;
  border:2px solid currentColor;border-top-color:transparent;animation:spin .7s linear infinite;
}
.btn.is-loading .spinner{display:block}
.btn.is-loading{pointer-events:none}
.btn.is-loading svg:not(.spinner){display:none}
@keyframes spin{to{transform:rotate(360deg)}}
.nav-toggle{display:none;width:40px;height:40px;border-radius:4px;border:1px solid var(--border);place-items:center}
.nav-toggle span{display:block;width:18px;height:1.5px;background:var(--text);position:relative;transition:.25s}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:1.5px;background:var(--text);transition:.25s}
.nav-toggle span::before{top:-6px}.nav-toggle span::after{top:6px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

/* ---------- 首页：月相电影感 ---------- */
.hero{
  min-height:100vh;display:flex;align-items:center;position:relative;
  padding:calc(var(--header-h) + 84px) 0 118px;overflow:hidden;
  background:linear-gradient(180deg,var(--bg) 0%,var(--bg-2) 55%,var(--bg) 100%);
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:0;
  background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(72% 64% at 32% 18%,#000 0%,transparent 92%);
  -webkit-mask-image:radial-gradient(72% 64% at 32% 18%,#000 0%,transparent 92%);
}
.sky{position:absolute;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}
.aurora{position:absolute;border-radius:50%;filter:blur(82px);mix-blend-mode:var(--aur-blend);opacity:var(--aur-opacity);will-change:transform;pointer-events:none}
.aur-a{width:58vw;height:40vw;left:-13vw;top:-11vw;background:radial-gradient(circle,var(--aur-a),transparent 66%);animation:aurDriftA 27s ease-in-out infinite alternate}
.aur-b{width:46vw;height:36vw;right:-11vw;top:2vw;background:radial-gradient(circle,var(--aur-b),transparent 66%);animation:aurDriftB 34s ease-in-out infinite alternate}
.aur-c{width:42vw;height:27vw;left:20vw;bottom:-9vw;background:radial-gradient(circle,var(--aur-c),transparent 66%);animation:aurDriftC 40s ease-in-out infinite alternate}
@keyframes aurDriftA{to{transform:translate(9vw,7vh) scale(1.16)}}
@keyframes aurDriftB{to{transform:translate(-8vw,9vh) scale(1.12)}}
@keyframes aurDriftC{to{transform:translate(6vw,-6vh) scale(1.2)}}
.hero-floor{
  position:absolute;left:-25%;right:-25%;bottom:-70px;height:270px;z-index:0;pointer-events:none;
  background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:46px 46px;transform:perspective(520px) rotateX(62deg);transform-origin:top;
  mask-image:linear-gradient(180deg,transparent,#000 34%);-webkit-mask-image:linear-gradient(180deg,transparent,#000 34%);
  opacity:.9;
}
.watermark{
  position:absolute;left:50%;bottom:-.24em;transform:translateX(-50%);z-index:0;pointer-events:none;user-select:none;
  font-family:var(--font-display);font-size:clamp(7rem,19vw,17rem);font-weight:700;line-height:1;
  letter-spacing:.18em;color:transparent;-webkit-text-stroke:1px var(--watermark);white-space:nowrap;
  will-change:transform;
}
.lunar-plate{
  position:relative;width:min(100%,520px);aspect-ratio:1;margin-inline:auto;
  z-index:1;pointer-events:none;animation:plateIn 1.6s var(--ease) .35s backwards;will-change:transform;
}
@keyframes plateIn{from{opacity:0;transform:translateY(20px) scale(.96)}to{opacity:1;transform:none}}
.lunar-plate svg{width:100%;height:100%;overflow:visible}
.plate-grid{fill:none;stroke:var(--grid-line)}
.plate-ring{fill:none;stroke:var(--border-strong)}
.plate-ring-faint{fill:none;stroke:var(--border)}
.plate-arc{fill:none;stroke:var(--border-strong);stroke-dasharray:1 6}
.plate-label{fill:var(--faint);font-size:10px;font-weight:600;letter-spacing:.22em}
.plate-title{fill:var(--accent);font-size:11px;font-weight:700;letter-spacing:.34em}
.plate-phase{opacity:.7;animation:phasePulse 4.5s ease-in-out infinite}
@keyframes phasePulse{0%,100%{opacity:.45}50%{opacity:.95}}
.phase-ring{fill:var(--surface);stroke:var(--border-strong);stroke-width:1}
.phase-fill{fill:var(--text)}
.phase-cut{fill:var(--bg)}
.plate-moon{
  filter:var(--moon-filter);animation:moonBreath 7s ease-in-out infinite alternate;transform-origin:center;
}
@keyframes moonBreath{from{transform:scale(.96)}to{transform:scale(1.04)}}
.plate-moon-ring{fill:none;stroke:var(--accent);stroke-width:1;opacity:.85}
.plate-moon-halo{fill:var(--accent);opacity:.06}
.plate-sat{fill:var(--accent-2)}
.plate-sat-tail{fill:none;stroke:var(--accent-2);stroke-width:.6;opacity:.5}
.plate-tick{stroke:var(--faint);stroke-width:1}
.hero .container{position:relative;z-index:3;display:grid;grid-template-columns:1.02fr .98fr;gap:44px;align-items:center}
.hero-eyebrow{display:flex;align-items:center;gap:12px;font-size:.72rem;font-weight:600;letter-spacing:.34em;color:var(--accent);margin-bottom:24px}
.hero-eyebrow::before{content:"";width:36px;height:1px;background:var(--accent)}
.hero h1{
  font-family:var(--font-display);font-size:clamp(1.9rem,3.6vw,3rem);line-height:1.3;font-weight:600;
  letter-spacing:.08em;margin-bottom:24px;max-width:600px;
}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero-sub{color:var(--muted);font-size:.98rem;max-width:540px;margin-bottom:38px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:54px}
.hero-stats{display:flex;gap:44px;flex-wrap:wrap;padding-top:26px;border-top:1px solid var(--border)}
.stat .num{font-size:1.55rem;font-weight:700;letter-spacing:.01em;font-variant-numeric:tabular-nums;color:var(--accent)}
.stat .lab{font-size:.78rem;color:var(--muted);margin-top:3px;letter-spacing:.05em}
.hero-copy > *{opacity:0;animation:heroIn .85s var(--ease) forwards}
.hero-copy > :nth-child(1){animation-delay:.15s}
.hero-copy > :nth-child(2){animation-delay:.28s}
.hero-copy > :nth-child(3){animation-delay:.42s}
.hero-copy > :nth-child(4){animation-delay:.56s}
.hero-copy > :nth-child(5){animation-delay:.7s}
@keyframes heroIn{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.hero-visual{
  position:relative;display:flex;flex-direction:column;align-items:center;gap:24px;
  opacity:0;animation:sheetIn 1s var(--ease) .5s forwards;
}
.hero-cap{
  display:grid;grid-template-columns:repeat(4,1fr);gap:8px;width:100%;
  border-top:1px solid var(--border);padding-top:16px;
}
.hero-cap > div{display:flex;flex-direction:column;gap:3px;padding-left:12px;border-left:1px solid var(--border-strong)}
.hero-cap b{font-family:var(--font-display);font-size:1.06rem;font-weight:600;color:var(--accent);letter-spacing:.04em}
.hero-cap span{font-size:.7rem;color:var(--muted);letter-spacing:.12em}
@keyframes sheetIn{from{opacity:0;transform:translateY(26px) scale(.98)}to{opacity:1;transform:none}}
.hero-hint{
  position:absolute;left:50%;bottom:24px;transform:translateX(-50%);z-index:3;
  display:flex;flex-direction:column;align-items:center;gap:9px;
  color:var(--faint);font-size:.66rem;letter-spacing:.32em;transition:opacity .4s,transform .4s;
}
.hero-hint.hidden{opacity:0;transform:translate(-50%,10px);pointer-events:none}
.hero-hint .line{width:1px;height:42px;background:linear-gradient(var(--accent),transparent);position:relative;overflow:hidden}
.hero-hint .line::after{content:"";position:absolute;left:0;top:-40%;width:100%;height:40%;background:var(--accent);animation:hintDrop 1.8s var(--ease) infinite}
@keyframes hintDrop{0%{top:-40%}100%{top:110%}}

/* ---------- 行业条 ---------- */
.trust-strip{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--bg);padding:22px 0}
.trust-strip .inner{display:flex;align-items:center;justify-content:center;gap:14px 34px;flex-wrap:wrap;text-align:center}
.trust-strip .label{font-size:.72rem;letter-spacing:.24em;color:var(--faint);margin-right:6px}
.trust-strip ul{display:flex;gap:14px 34px;flex-wrap:wrap;justify-content:center}
.trust-strip li{font-size:.86rem;color:var(--muted);letter-spacing:.06em;transition:color .25s}
.trust-strip li:hover{color:var(--text)}
.trust-strip li + li{position:relative}
.trust-strip li + li::before{content:"";position:absolute;left:-18px;top:50%;width:3px;height:3px;border-radius:50%;background:var(--border-strong)}

/* ---------- 业务卡片 ---------- */
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:card}
.service-card{
  position:relative;padding:28px 26px;border-radius:var(--radius);background:var(--surface);
  border:1px solid var(--border);transition:border-color .3s,box-shadow .3s;overflow:hidden;
}
.service-card::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .45s;
  background:radial-gradient(340px circle at var(--mx,50%) var(--my,0%),var(--card-glow),transparent 55%);
}
.service-card::after{
  content:"0" counter(card);counter-increment:card;
  position:absolute;top:22px;right:24px;font-size:.7rem;font-weight:600;letter-spacing:.14em;color:var(--faint);
  transition:color .3s,transform .3s var(--ease);
}
.service-card:hover{border-color:var(--border-strong);box-shadow:var(--shadow)}
.service-card:hover::before{opacity:1}
.service-card:hover::after{color:var(--accent);transform:translateY(-2px)}
.ico-tile{
  width:40px;height:40px;border-radius:4px;background:var(--accent-soft);
  border:1px solid var(--border);display:grid;place-items:center;margin-bottom:20px;transition:border-color .3s,transform .3s var(--ease);
}
.ico-tile svg{width:19px;height:19px;stroke:var(--accent)}
.service-card:hover .ico-tile{border-color:var(--accent);transform:rotate(-4deg) scale(1.05)}
.service-card h3{font-size:1.02rem;font-weight:650;margin-bottom:10px;letter-spacing:.01em}
.service-card p{color:var(--muted);font-size:.87rem;margin-bottom:18px;min-height:68px}
.tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:20px}
.tags span{font-size:.7rem;font-weight:500;padding:3px 8px;border-radius:3px;border:1px solid var(--border);color:var(--muted);letter-spacing:.04em;transition:color .25s,border-color .25s}
.service-card:hover .tags span{border-color:var(--border-strong)}
.card-link{display:inline-flex;align-items:center;gap:7px;font-weight:600;font-size:.84rem;color:var(--accent)}
.card-link svg{width:14px;height:14px;transition:transform .3s var(--ease)}
.service-card:hover .card-link svg{transform:translateX(4px)}

/* ---------- 数据模态 Tabs ---------- */
.tabs{margin-top:92px}
.tab-btns{
  position:relative;display:flex;gap:28px;justify-content:center;flex-wrap:wrap;margin-bottom:40px;
  border-bottom:1px solid var(--border);
}
.tab-btn{
  position:relative;padding:12px 2px;color:var(--muted);font-weight:600;font-size:.92rem;
  transition:color .25s;background:none;
}
.tab-btn:hover{color:var(--text)}
.tab-btn.active{color:var(--text)}
.tab-slider{position:absolute;bottom:-1px;left:0;width:0;height:1px;background:var(--accent);transition:left .4s var(--ease),width .4s var(--ease)}
.tab-panel{display:none}
.tab-panel.active{display:grid;grid-template-columns:.92fr 1.08fr;gap:48px;align-items:center}
.tab-panel.active .tab-copy > *{animation:riseIn .55s var(--ease) both}
.tab-panel.active .tab-copy > :nth-child(1){animation-delay:.05s}
.tab-panel.active .tab-copy > :nth-child(2){animation-delay:.14s}
.tab-panel.active .tab-copy > :nth-child(3){animation-delay:.23s}
.tab-panel.active .tab-figure{animation:riseIn .6s var(--ease) .2s both}
@keyframes riseIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.tab-copy h3{font-size:1.25rem;font-weight:650;margin-bottom:12px}
.tab-copy p{color:var(--muted);font-size:.92rem;margin-bottom:20px}
.tab-points li{display:flex;gap:10px;align-items:flex-start;padding:8px 0;font-size:.88rem;transition:transform .3s var(--ease),color .3s}
.tab-points li:hover{transform:translateX(5px);color:var(--text)}
.tab-points svg{width:16px;height:16px;flex:none;margin-top:4px;color:var(--accent)}
.tab-figure{border-radius:var(--radius);padding:30px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow)}
.tab-metric{display:flex;gap:30px;flex-wrap:wrap;margin-bottom:26px;padding-bottom:22px;border-bottom:1px solid var(--border)}
.tab-metric div b{font-size:1.7rem;font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums}
.tab-metric div span{display:block;font-size:.78rem;color:var(--muted);margin-top:2px}
.tab-bars div{display:flex;align-items:center;gap:14px;font-size:.82rem;color:var(--muted);margin-bottom:12px}
.tab-bars .bar{flex:1;height:5px;background:var(--bg-3);overflow:hidden;border-radius:2px}
.tab-bars .bar i{display:block;height:100%;background:var(--accent);width:0;transition:width 1s var(--ease) .25s}
.tab-panel.active .bar i{width:var(--w)}

/* ---------- 服务流程 ---------- */
.process{margin-top:92px}
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.step{
  position:relative;padding:24px 22px 22px;border-radius:var(--radius);
  border:1px solid var(--border);background:var(--surface);text-align:left;
  transition:border-color .3s,box-shadow .3s,transform .3s var(--ease);
}
.step::before{
  content:"0" counter(step);counter-increment:step;
  position:absolute;top:16px;right:16px;font-size:.72rem;font-weight:600;letter-spacing:.08em;color:var(--faint);
  transition:color .3s,transform .3s var(--ease);
}
.step:hover{border-color:var(--border-strong);box-shadow:var(--shadow-soft,var(--shadow));transform:translateY(-4px)}
.step:hover::before{color:var(--accent);transform:translateY(-2px)}
.step h4{font-size:.95rem;font-weight:650;margin:0 0 10px}
.step p{font-size:.8rem;color:var(--muted)}

/* ---------- 关于我们 ---------- */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.about-visual{border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);overflow:hidden}
.about-visual svg{width:100%;height:auto}
.about-copy h2{font-size:clamp(1.35rem,2.8vw,1.9rem);line-height:1.4;margin-bottom:18px;letter-spacing:.02em;font-weight:700}
.about-copy > p{color:var(--muted);font-size:.93rem;margin-bottom:14px}
.about-points{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}
.about-point{display:flex;gap:10px;align-items:center;padding:12px 14px;border-radius:4px;border:1px solid var(--border);background:var(--surface);font-size:.84rem;font-weight:600;transition:border-color .3s,transform .3s var(--ease)}
.about-point:hover{border-color:var(--accent);transform:translateX(4px)}
.about-point svg{width:16px;height:16px;color:var(--accent);flex:none}
.values{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:72px}
.value-card{padding:24px 22px;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);transition:border-color .3s,transform .3s var(--ease)}
.value-card:hover{border-color:var(--border-strong);transform:translateY(-4px)}
.value-card .v-no{display:block;font-size:.7rem;font-weight:600;letter-spacing:.16em;color:var(--accent);margin-bottom:14px}
.value-card h4{font-size:.98rem;font-weight:650;margin-bottom:8px}
.value-card p{font-size:.82rem;color:var(--muted)}

/* ---------- 时间线 ---------- */
.timeline{margin-top:92px;max-width:800px;margin-inline:auto;position:relative;padding-left:34px}
.timeline::before{
  content:"";position:absolute;left:7px;top:6px;bottom:6px;width:1px;background:var(--border-strong);
  transform:scaleY(var(--tp,0));transform-origin:top;transition:transform .3s linear;
}
.tl-item{position:relative;padding:0 0 34px 30px;opacity:0;transform:translateX(-10px);transition:opacity .55s var(--ease),transform .55s var(--ease)}
.timeline.in .tl-item{opacity:1;transform:none}
.timeline.in .tl-item:nth-child(1){transition-delay:.05s}
.timeline.in .tl-item:nth-child(2){transition-delay:.15s}
.timeline.in .tl-item:nth-child(3){transition-delay:.25s}
.timeline.in .tl-item:nth-child(4){transition-delay:.35s}
.timeline.in .tl-item:nth-child(5){transition-delay:.45s}
.tl-item::before{content:"";position:absolute;left:-30px;top:7px;width:7px;height:7px;border-radius:50%;background:var(--bg);border:1px solid var(--accent);transition:background .3s,box-shadow .3s}
.tl-item:hover::before{background:var(--accent);box-shadow:0 0 0 5px var(--card-glow)}
.tl-item .year{font-size:.74rem;font-weight:700;letter-spacing:.2em;color:var(--accent);margin-bottom:5px}
.tl-item h4{font-size:1rem;font-weight:650;margin-bottom:5px}
.tl-item p{color:var(--muted);font-size:.87rem;max-width:600px}

/* ---------- 团队 ---------- */
.team{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:40px}
.member{padding:26px 20px;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);text-align:center;transition:border-color .3s,transform .3s var(--ease),box-shadow .3s}
.member:hover{border-color:var(--border-strong);transform:translateY(-5px);box-shadow:var(--shadow)}
.avatar{
  width:60px;height:60px;margin:0 auto 14px;border-radius:4px;background:var(--accent-soft);
  display:grid;place-items:center;font-size:.95rem;font-weight:650;color:var(--accent);letter-spacing:.06em;
  transition:transform .35s var(--ease);
}
.member:hover .avatar{transform:scale(1.06) rotate(-2deg)}
.member h4{font-size:.95rem;font-weight:650}
.member .role{display:block;font-size:.74rem;color:var(--accent);font-weight:600;margin:4px 0 9px;letter-spacing:.04em}
.member p{font-size:.8rem;color:var(--muted)}
.team-note{margin-top:24px;text-align:center;font-size:.76rem;color:var(--faint)}

/* ---------- 联系我们 ---------- */
.contact-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:20px;align-items:start}
.contact-card{border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);padding:34px}
.contact-card h3{font-size:1.15rem;font-weight:650;margin-bottom:6px}
.contact-card > p{color:var(--muted);font-size:.86rem;margin-bottom:26px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:flex;flex-direction:column;gap:6px;position:relative}
.field.full{grid-column:1/-1}
.field label{font-size:.78rem;font-weight:600;color:var(--muted);letter-spacing:.04em;transition:color .25s}
.field label em{color:var(--accent);font-style:normal}
.field input,.field select,.field textarea{
  background:var(--surface-2);border:1px solid var(--border);border-radius:4px;
  padding:11px 13px;color:var(--text);outline:none;transition:border-color .25s,background .25s,box-shadow .25s;
}
.field textarea{resize:vertical;min-height:110px}
.field:focus-within label{color:var(--accent)}
.field input:focus,.field select:focus,.field textarea:focus{
  border-color:var(--accent);background:var(--surface);
  box-shadow:inset 2px 0 0 var(--accent);
}
.field select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;background-size:5px 5px;background-repeat:no-repeat}
.check{display:flex;gap:9px;align-items:flex-start;font-size:.78rem;color:var(--muted);cursor:pointer}
.check input{width:15px;height:15px;margin-top:3px;accent-color:var(--accent)}
.info-stack{display:flex;flex-direction:column;gap:14px}
.info-card{padding:20px;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);display:flex;gap:14px;align-items:flex-start;transition:border-color .3s,transform .3s var(--ease)}
.info-card:hover{border-color:var(--border-strong);transform:translateX(4px)}
.info-card .ico{width:38px;height:38px;border-radius:4px;background:var(--accent-soft);border:1px solid var(--border);display:grid;place-items:center;flex:none}
.info-card .ico svg{width:17px;height:17px;stroke:var(--accent)}
.info-card h4{font-size:.9rem;font-weight:650;margin-bottom:3px}
.info-card p{font-size:.8rem;color:var(--muted)}
.faq{margin-top:2px}
.faq details{border:1px solid var(--border);border-radius:4px;background:var(--surface);margin-bottom:8px;overflow:hidden;transition:border-color .3s}
.faq details[open]{border-color:var(--border-strong)}
.faq summary{
  list-style:none;cursor:pointer;padding:14px 16px;font-weight:600;font-size:.86rem;
  display:flex;justify-content:space-between;align-items:center;gap:12px;transition:color .25s;
}
.faq summary:hover{color:var(--accent)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.05rem;font-weight:400;color:var(--accent);transition:transform .3s var(--ease)}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{padding:0 16px 14px;color:var(--muted);font-size:.8rem;animation:riseIn .35s var(--ease)}

/* ---------- CTA 横条 ---------- */
.cta-band{
  margin-top:84px;border:1px solid var(--border);border-radius:var(--radius);
  background:var(--surface);padding:36px 38px;display:flex;justify-content:space-between;align-items:center;gap:28px;flex-wrap:wrap;
  position:relative;overflow:hidden;
}
.cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(520px circle at 85% 50%,var(--card-glow),transparent 60%);pointer-events:none}
.cta-band h3{font-size:1.25rem;font-weight:700;margin-bottom:6px;letter-spacing:.02em;position:relative}
.cta-band p{color:var(--muted);font-size:.88rem;position:relative}
.cta-band .btn{position:relative}

/* ---------- 页脚 ---------- */
.site-footer{border-top:1px solid var(--border);background:var(--bg-2);padding:64px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;margin-bottom:46px}
.footer-grid h5{font-size:.72rem;letter-spacing:.2em;color:var(--faint);margin-bottom:16px;font-weight:600;text-transform:uppercase}
.footer-grid p{color:var(--muted);font-size:.86rem}
.footer-brand p{margin:14px 0 18px;max-width:300px}
.socials{display:flex;gap:8px}
.socials a{width:36px;height:36px;border-radius:4px;border:1px solid var(--border);background:var(--surface);display:grid;place-items:center;transition:border-color .25s,color .25s,transform .25s var(--ease)}
.socials a:hover{border-color:var(--text);color:var(--accent);transform:translateY(-3px)}
.socials svg{width:15px;height:15px}
.footer-links li{margin-bottom:10px}
.footer-links a{color:var(--muted);font-size:.86rem;transition:color .25s,padding-left .25s var(--ease)}
.footer-links a:hover{color:var(--accent);padding-left:5px}
.footer-bottom{border-top:1px solid var(--border);padding-top:22px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:.76rem;color:var(--faint)}
.footer-bottom a{color:var(--faint);margin-left:16px;transition:color .25s}
.footer-bottom a:hover{color:var(--accent)}

/* ---------- 悬浮工具 ---------- */
.back-top{
  position:fixed;left:20px;bottom:20px;z-index:1100;width:46px;height:46px;border-radius:6px;
  background:var(--surface);border:1px solid var(--border);display:grid;place-items:center;
  opacity:0;pointer-events:none;transform:translateY(10px);transition:.35s var(--ease);box-shadow:var(--shadow);
}
.back-top.show{opacity:1;pointer-events:auto;transform:none}
.back-top:hover{border-color:var(--text)}
.back-top svg{width:38px;height:38px}
.back-top .bt-track{fill:none;stroke:var(--border);stroke-width:1.2}
.back-top .bt-progress{fill:none;stroke:var(--accent);stroke-width:1.6;stroke-linecap:round;transform:rotate(-90deg);transform-origin:center}
.back-top .bt-arrow{fill:none;stroke:var(--text);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.theme-dock{position:fixed;right:20px;bottom:20px;z-index:1200;display:flex;flex-direction:column;align-items:flex-end;gap:12px}
.theme-toggle{
  width:46px;height:46px;border-radius:6px;background:var(--btn-bg);color:var(--btn-text);
  display:grid;place-items:center;box-shadow:var(--shadow);transition:opacity .25s,transform .25s var(--ease);
}
.theme-toggle:hover{opacity:.9}
.theme-toggle svg{width:17px;height:17px}
.theme-panel{
  width:252px;padding:12px;border-radius:6px;background:var(--surface);border:1px solid var(--border);
  box-shadow:var(--shadow);opacity:0;transform:translateY(10px) scale(.98);pointer-events:none;transition:.28s var(--ease);
}
.theme-panel.open{opacity:1;transform:none;pointer-events:auto}
.theme-panel h6{font-size:.68rem;letter-spacing:.2em;color:var(--faint);margin:4px 6px 10px;font-weight:600;text-transform:uppercase}
.theme-option{
  display:flex;align-items:center;gap:11px;width:100%;text-align:left;padding:8px;border-radius:4px;
  border:1px solid transparent;transition:background .2s,border-color .2s,opacity .35s var(--ease),transform .35s var(--ease);
  margin-bottom:2px;opacity:0;transform:translateY(6px);
}
.theme-panel.open .theme-option{opacity:1;transform:none}
.theme-panel.open .theme-option:nth-of-type(2){transition-delay:.04s}
.theme-panel.open .theme-option:nth-of-type(3){transition-delay:.08s}
.theme-panel.open .theme-option:nth-of-type(4){transition-delay:.12s}
.theme-option:hover{background:var(--surface-2)}
.theme-option.active{border-color:var(--border-strong);background:var(--surface-2)}
.swatch{width:38px;height:38px;border-radius:3px;flex:none;border:1px solid var(--border)}
.swatch.light{background:#f5f4f0;position:relative}
.swatch.light::after{content:"";position:absolute;left:9px;bottom:9px;width:16px;height:3px;background:#1f5f63}
.swatch.deep{background:#0a0c12;position:relative}
.swatch.deep::after{content:"";position:absolute;left:9px;bottom:9px;width:16px;height:3px;background:#d8b26e}
.swatch.neon{background:#071016;position:relative}
.swatch.neon::after{content:"";position:absolute;left:9px;bottom:9px;width:16px;height:3px;background:#7fb3c9}
.theme-option b{display:block;font-size:.84rem;font-weight:650}
.theme-option span{font-size:.72rem;color:var(--muted)}
.theme-option .checkmark{margin-left:auto;width:18px;height:18px;border-radius:3px;background:var(--accent);color:var(--bg);display:none;place-items:center}
.theme-option.active .checkmark{display:grid}
.theme-option .checkmark svg{width:10px;height:10px}

/* ---------- Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:30px;transform:translate(-50%,16px);z-index:1300;
  padding:13px 22px 15px;border-radius:4px;background:var(--surface);border:1px solid var(--border-strong);
  box-shadow:var(--shadow);font-weight:600;font-size:.84rem;opacity:0;pointer-events:none;transition:.3s var(--ease);
  display:flex;align-items:center;gap:9px;overflow:hidden;
}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast svg{width:15px;height:15px;color:var(--accent);flex:none}
.toast::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--accent)}
.toast.show::after{animation:toastBar 3.2s linear forwards}
@keyframes toastBar{from{width:100%}to{width:0}}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .services-grid{grid-template-columns:repeat(2,1fr)}
  .values{grid-template-columns:repeat(2,1fr)}
  .team{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .lunar-plate{max-width:470px}
}
@media (max-width:920px){
  .nav-links{
    position:fixed;inset:var(--header-h) 14px auto;flex-direction:column;align-items:stretch;
    background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:10px;
    box-shadow:var(--shadow);opacity:0;transform:translateY(-8px);pointer-events:none;transition:.22s var(--ease);
  }
  .nav-links.open{opacity:1;transform:none;pointer-events:auto}
  .nav-links a{padding:12px 14px}
  .nav-links a.active::after{left:14px;right:14px}
  .nav-toggle{display:grid}
  .nav-actions .btn-primary{display:none}
  .hero .container{grid-template-columns:1fr;gap:52px}
  .hero{padding-top:calc(var(--header-h) + 56px)}
  .hero-copy{max-width:560px}
  .lunar-plate{max-width:420px}
  .hero-cap{grid-template-columns:repeat(2,1fr);row-gap:14px}
  .watermark{font-size:24vw;bottom:-.1em}
  .about-grid{grid-template-columns:1fr;gap:40px}
  .contact-grid{grid-template-columns:1fr}
  .tab-panel.active{grid-template-columns:1fr;gap:28px}
  .section[data-num]::before{font-size:5rem;top:52px}
}
@media (max-width:620px){
  .section{padding:80px 0}
  .section[data-num]::before{display:none}
  .services-grid{grid-template-columns:1fr}
  .values{grid-template-columns:1fr 1fr}
  .team{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .form-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;text-align:center}
  .footer-bottom a{margin:0 8px}
  .hero-stats{gap:26px}
  .cta-band{padding:28px 22px}
  .container{width:calc(100% - 32px)}
  .back-top{display:none}
  .sheet-list > div{flex-direction:column;gap:3px}
  .sheet-list dd{text-align:left}
  .lunar-plate{max-width:360px}
  .watermark{font-size:27vw;opacity:.8}
  .hero-floor{opacity:.55}
  .hero h1{font-size:1.75rem}
  .hero-hint{display:none}
}
@media (max-width:400px){
  .values{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
}
/* Answers open at their natural height, without slide-in or icon rotation effects. */
#contact .faq details p {
  animation: none;
}

#contact .faq summary::after {
  transition: none;
}

/* Keep both contact columns aligned without fixing their height. */
@media (min-width: 921px) {
  #contact .contact-grid {
    align-items: stretch;
  }

  #contact .contact-card {
    display: flex;
    flex-direction: column;
  }

  #contact .contact-card > form {
    display: flex;
    flex: 1;
    min-width: 0;
  }

  #contact .form-grid {
    flex: 1;
    min-width: 0;
    grid-template-rows: auto auto auto 1fr auto auto;
  }

  #contact .field textarea {
    flex: 1 0 auto;
  }

  #contact .info-card {
    flex: 1;
    align-items: center;
  }

  #contact .faq details:last-child {
    margin-bottom: 0;
  }
}