/*  sections.css — 各区块
    节奏：深色首屏（星辰光场）→ 亮区能力 → 蓝色数据带 → 亮区服务 → 灰区产品 → 深色收尾。
    明暗交替制造版面韵律，留白只出现在有内容对置的地方。 */

/* ============ HERO（深色，承载 Three.js 星辰光场） ============ */
.hero{
  position:relative;
  background:
    radial-gradient(ellipse 64% 58% at 76% 50%,rgba(47,107,255,.14),transparent 65%),
    linear-gradient(160deg,var(--navy-2) 0%,var(--navy) 62%);
  color:var(--on-dark);
  min-height:100vh;
  min-height:100svh;
  display:flex;flex-direction:column;
  padding:var(--nav-h) 0 0;
  overflow:hidden;
}
/* 深空光斑：低饱和径向渐变，模糊后近乎纯色，为静态底色增加纵深 */
.hero-blob{
  position:absolute;pointer-events:none;border-radius:50%;
  filter:blur(90px);opacity:.4;will-change:transform;
}
.hero-blob.b1{width:560px;height:560px;top:12%;right:4%;opacity:.25;background:radial-gradient(circle,rgba(47,107,255,.4),transparent 65%)}
.hero-blob.b2{width:420px;height:420px;bottom:-120px;left:-100px;background:radial-gradient(circle,rgba(0,168,198,.32),transparent 65%)}
/* 首屏星点（hero-stars.js 注入）：呼应"天辰"品牌名 */
.hero-stars{position:absolute;inset:0;z-index:1;pointer-events:none;overflow:hidden;opacity:.65;
  -webkit-mask-image:linear-gradient(90deg,rgba(0,0,0,.35),#000 72%);
  mask-image:linear-gradient(90deg,rgba(0,0,0,.35),#000 72%);
}
.hero-star{position:absolute;border-radius:50%;background:#b9ccff;animation:twinkle-h 5s ease-in-out infinite}
@keyframes twinkle-h{0%,100%{opacity:.06;transform:scale(.7)}50%{opacity:.3;transform:scale(1.12)}}
.hero-grid{position:relative;z-index:2}
.hero-grid{
  width:100%;flex:1;
  display:grid;grid-template-columns:1.02fr .98fr;
  gap:clamp(24px,4vw,56px);align-items:center;
  padding-top:clamp(32px,5vh,64px);
  padding-bottom:clamp(32px,5vh,64px);
}
.hero h1{margin:18px 0 26px}
.hero .lede{max-width:46ch;font-size:15.5px;line-height:2;margin-bottom:36px}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:clamp(44px,5vw,64px)}

/* 数据证明：发丝线上方三列，紧凑排布 */
.proof{
  display:grid;grid-template-columns:repeat(3,auto);justify-content:start;
  gap:clamp(32px,5vw,72px);
  border-top:1px solid var(--line-dark);padding-top:26px;
}
.proof dt{
  font-family:var(--font-display);font-weight:700;font-size:clamp(26px,3vw,36px);
  color:var(--on-dark-strong);line-height:1.15;letter-spacing:-.02em;
}
.proof dt em{font-style:normal;font-size:.55em;color:var(--accent-soft);margin-left:2px}
.proof dd{font-size:11.5px;letter-spacing:.24em;color:var(--on-dark-dim);margin-top:6px}

/* 星辰光场容器：无投影无装饰，画布直接融入深色底 */
.hero-visual{position:relative;height:clamp(360px,43vw,580px)}
#star3d{position:absolute;inset:-16%;-webkit-tap-highlight-color:transparent}
#star3d canvas{display:block;width:100%!important;height:100%!important}
/* WebGL 不可用时的 CSS 兜底光晕 */
.visual-fallback{
  position:absolute;inset:6%;border-radius:50%;
  background:radial-gradient(ellipse,rgba(47,107,255,.14),transparent 65%);
}
.visual-fallback::before{content:"";position:absolute;inset:28%;
  background:radial-gradient(ellipse 3% 50%,rgba(155,202,255,.7),transparent),radial-gradient(ellipse 50% 3%,rgba(155,202,255,.7),transparent),radial-gradient(circle,#d1e7ff 0%,rgba(93,150,255,.6) 2%,rgba(47,107,255,.12) 15%,transparent 65%);
  animation:fallback-core-breathe 20s ease-in-out infinite;
}
.visual-fallback::after{content:"";position:absolute;inset:27% 6%;border:1px solid rgba(113,163,255,.2);border-radius:50%;transform:rotate(-28deg);filter:blur(2px);box-shadow:0 0 28px rgba(70,116,240,.14),inset 0 0 24px rgba(70,116,240,.12)}
.hero-visual.is-ready .visual-fallback::before,.hero-visual.is-ready .visual-fallback::after{opacity:0}
@keyframes fallback-core-breathe{0%,100%{transform:scale(1)}50%{transform:scale(1.025)}}

/* ============ STATS 数据带（品牌蓝纯色，全页唯一重色块） ============ */
.stats{
  background:var(--accent);color:#fff;
  border-top:none;
}
.stats-row{display:grid;grid-template-columns:repeat(4,1fr);padding:clamp(44px,5.5vw,64px) var(--pad-x)}
.stat b{
  font-family:var(--font-display);font-weight:800;font-size:clamp(36px,4.6vw,54px);
  color:#fff;line-height:1.05;letter-spacing:-.03em;display:block;
}
.stat b span{font-size:.48em;font-weight:600;margin-left:2px;opacity:.85}
.stat-label{display:block;margin-top:8px;font-size:12px;letter-spacing:.26em;color:rgba(255,255,255,.72)}
.stat + .stat{border-left:1px solid rgba(255,255,255,.22);padding-left:clamp(20px,3vw,40px)}

/* ============ SERVICES 流程条 ============ */
/* 四步工序：发丝网格的横置变体，与上方服务阵呼应 */
.flow{
  margin-top:1px;
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);border-top:none;
}
.flow li{background:var(--paper);padding:24px clamp(18px,2.2vw,28px)}
.flow .num{
  font-family:var(--font-display);font-weight:600;font-size:12px;letter-spacing:.16em;
  color:var(--accent);display:block;margin-bottom:8px;
}
.flow h4{font-size:15px;margin-bottom:4px}
.flow p{font-size:12.5px;color:var(--muted);line-height:1.8}

/* ============ PRODUCTS ============ */
/* 展示形态：macOS 风格窗框承载截图（窗控点 + 居中标题，无地址栏），
   外层 .shot-stage 提供透视，.shot 随指针 3D 倾斜（tilt.js）；
   两栏等高拉伸：行高取较高一侧，截图 cover 填满，底边天然对齐。 */
.showcase{
  display:grid;grid-template-columns:1.04fr .96fr;
  gap:clamp(32px,4.5vw,68px);align-items:stretch;
  margin-bottom:clamp(40px,5vw,64px);
}
.shot-stage{perspective:1400px}
.shot{
  border:1px solid var(--line);border-radius:10px;overflow:hidden;
  background:var(--navy);
  transform-style:preserve-3d;will-change:transform;
}
@media (min-width:1081px){
  .shot-stage,.shot{height:100%}
  .shot{display:flex;flex-direction:column}
  .shot img{flex:1;min-height:0;object-fit:cover}
}
.shot-bar{
  position:relative;display:flex;align-items:center;gap:8px;
  padding:12px 14px;background:var(--navy-2);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.shot-bar i{width:11px;height:11px;border-radius:50%}
.shot-bar i:nth-child(1){background:#ff5f57}
.shot-bar i:nth-child(2){background:#febc2e}
.shot-bar i:nth-child(3){background:#28c840}
.shot-title{
  position:absolute;left:50%;transform:translateX(-50%);
  font-family:var(--font-display);font-size:11px;letter-spacing:.14em;color:#7484a3;
}
.shot img{width:100%}
.showcase-text h3{font-size:clamp(26px,3vw,34px);font-weight:700}
.pf-tag{
  display:block;margin-top:8px;font-family:var(--font-body);font-weight:400;
  font-size:13px;letter-spacing:.18em;color:var(--accent);
}
.pf-desc{margin:20px 0 22px;font-size:14px;line-height:2;max-width:52ch}
/* 特性清单：单列长发丝表 → 双列紧凑阵，右栏高度与左栏截图拉齐 */
.feats{
  margin-bottom:28px;border-top:1px solid var(--line);
  display:grid;grid-template-columns:1fr 1fr;column-gap:clamp(20px,2.4vw,32px);
}
.feats li{
  padding:10px 0 10px 24px;border-bottom:1px solid var(--line);
  font-size:13px;color:var(--body);line-height:1.7;position:relative;
}
.feats li::before{
  content:"—";position:absolute;left:0;color:var(--accent);
  font-family:var(--font-display);font-weight:600;
}
.upcoming{
  margin-top:24px;padding:18px 0 0;border-top:1px solid var(--line);
  font-size:13.5px;color:var(--muted);
}
.upcoming a{color:var(--accent);border-bottom:1px solid currentColor;padding-bottom:1px}
.upcoming a:hover{color:var(--accent-soft)}

/* ============ PARTNERS：两组等宽内容衔接，移动一个组宽即完成循环 ============ */
.partners{padding:clamp(48px,6vw,72px) 0;background:var(--paper);border-top:1px solid var(--line)}
.partners-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:30px}
.partners-heading .kicker{margin-bottom:8px}
.partners-heading h2{font-size:clamp(24px,3vw,32px)}
.partners-marquee{overflow:hidden;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 5%,#000 95%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 5%,#000 95%,transparent);
}
.partners-track{display:flex;width:max-content}
.partners-group{display:flex;align-items:center;gap:40px;padding-right:40px;flex-shrink:0}
.partner-logo{display:flex;align-items:center;justify-content:center;width:180px;height:92px;flex:none;transition:transform .22s ease}
.partner-logo img{width:180px;height:64px;object-fit:contain}
.partner-logo--sunshine{justify-content:flex-start;overflow:hidden}
.partner-logo--sunshine img{width:auto;max-width:none;height:35px;object-fit:contain;object-position:left center}
.partners-track.is-ready{animation:partners-scroll var(--partners-duration,36s) linear infinite;will-change:transform}
.partners-marquee:focus-visible .partners-track{animation-play-state:paused}
.partners-marquee:focus-visible{outline:2px solid var(--accent);outline-offset:6px}
@media (hover:hover){
  .partners-marquee:hover .partners-track{animation-play-state:paused}
  .partner-logo:hover{transform:scale(1.06)}
}
@keyframes partners-scroll{to{transform:translateX(-50%)}}
@media (max-width:720px){
  .partners-group{gap:24px;padding-right:24px}
  .partner-logo{width:148px;height:80px}
  .partner-logo img{width:148px;height:56px}
  .partner-logo--sunshine img{height:29px}
}
@media (prefers-reduced-motion:reduce){
  .partners-marquee{overflow-x:auto;-webkit-mask-image:none;mask-image:none}
  .partners-track.is-ready{animation:none;transform:none;will-change:auto}
  .partners-group[aria-hidden="true"],.partners-group>[aria-hidden="true"]{display:none}
}

/* ============ CONTACT（深色收尾，与首屏成环） ============ */
.contact{
  position:relative;
  background:
    radial-gradient(ellipse 60% 50% at 85% 10%,rgba(47,107,255,.18),transparent 60%),
    var(--navy);
  padding:calc(var(--section-y) + 12px) 0;
  overflow:hidden;
}
/* 装饰星点层（twinkles.js 注入 .tw），纯氛围不参与交互 */
.contact-inner{position:absolute;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.contact-inner .tw{
  position:absolute;border-radius:50%;background:#cfe0ff;
  animation:twinkle 4.5s ease-in-out infinite;
}
@keyframes twinkle{0%,100%{opacity:.12;transform:scale(.7)}50%{opacity:.9;transform:scale(1.15)}}
.contact-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(36px,6vw,88px);align-items:start}
.contact h2{margin-bottom:22px}
.contact .lede{max-width:44ch;margin-bottom:32px}
.contact-list div{
  display:grid;grid-template-columns:150px 1fr;gap:16px;align-items:baseline;
  padding:18px 0;border-bottom:1px solid var(--line-dark);
}
.contact-list div:first-child{border-top:1px solid var(--line-dark)}
.contact-list dt{font-size:11px;letter-spacing:.2em;color:var(--on-dark-dim)}
.contact-list dd{font-size:15.5px;color:#e8eefb;font-weight:500;letter-spacing:.01em}
.contact-list dd a:hover{color:var(--accent-soft)}
/* 在线状态用静态亮绿文字表达（无呼吸灯动画） */
.contact-list .online{
  color:#5ee6a8;font-family:var(--font-display);font-weight:600;
  font-size:13px;letter-spacing:.1em;
}