/* NORSTONE INTERNATIONAL ENERGY — site styles (brand: STRATA, petrol + copper) */
:root{
  --bg:#07161E; --bg2:#0A1F2A; --ink:#E6EEF0; --ink2:#B4C7CE; --muted:#7F9AA4;
  --line:rgba(230,238,240,.10); --line2:rgba(230,238,240,.18);
  --cu:#E2852B; --cu2:#F5A24A; --cu-glow:rgba(226,133,43,.38);
  --glass:rgba(8,28,38,.55);
  --r:22px; --pad:clamp(16px,4vw,44px); --maxw:1260px;
  --cjk:'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Noto Sans SC',sans-serif;
  --f-d:'Unbounded',var(--cjk); --f-b:'Manrope',system-ui,var(--cjk); --f-m:'Michroma','Unbounded',sans-serif;
  --ease:cubic-bezier(.2,.7,.1,1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:auto}
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto!important}
body{background:var(--bg);color:var(--ink);font-family:var(--f-b);font-size:17px;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
html[lang^="zh"] body{letter-spacing:.02em}
html[lang^="zh"] .h1,html[lang^="zh"] .h2{letter-spacing:.01em;line-height:1.18}
img,svg{display:block}
a{color:inherit}
::selection{background:var(--cu);color:#140a02}

/* ---------- background layers ---------- */
#scene{position:fixed;inset:0;width:100vw;height:100vh;z-index:0;display:block}
.shade{position:fixed;inset:0;z-index:1;pointer-events:none;background:
  radial-gradient(120% 90% at 72% 42%,transparent 0%,rgba(7,22,30,.30) 55%,rgba(7,22,30,.88) 100%),
  linear-gradient(90deg,rgba(7,22,30,.78) 0%,rgba(7,22,30,.22) 52%,rgba(7,22,30,0) 100%)}
.grain{position:fixed;inset:-50%;z-index:2;pointer-events:none;opacity:.055;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  animation:grain 1.4s steps(6) infinite}
@keyframes grain{0%{transform:translate(0,0)}20%{transform:translate(-3%,2%)}40%{transform:translate(2%,-3%)}60%{transform:translate(-2%,-1%)}80%{transform:translate(3%,3%)}100%{transform:translate(0,0)}}
.glow{position:fixed;left:0;top:0;width:420px;height:420px;margin:-210px 0 0 -210px;border-radius:50%;pointer-events:none;z-index:2;
  background:radial-gradient(circle,rgba(226,133,43,.10),transparent 62%);opacity:0;transition:opacity .5s;will-change:transform}
@media (hover:hover) and (pointer:fine){.glow.is-on{opacity:1}}
main,.ftr{position:relative;z-index:3}
body.no-webgl{background:radial-gradient(90% 70% at 70% 30%,#0F2E3D,#07161E)}

/* ---------- loader ---------- */
.loader{position:fixed;inset:0;z-index:200;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:22px;transition:opacity 1s var(--ease),visibility 1s}
.loader.is-done{opacity:0;visibility:hidden}
.loader-mark svg{width:118px;height:118px;overflow:visible}
.loader-word{font-family:var(--f-m);font-size:15px;letter-spacing:.42em;padding-left:.42em;color:var(--ink);opacity:0;animation:fadeIn 1s .7s forwards}
.loader-bar{width:120px;height:1px;background:var(--line2);overflow:hidden}
.loader-bar span{display:block;height:100%;background:var(--cu);transform-origin:left;animation:load 1.6s var(--ease) forwards}
@keyframes load{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes fadeIn{to{opacity:1}}

/* ---------- layout ---------- */
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
.sec{padding:clamp(100px,13vw,180px) 0;position:relative}
.grid2{display:grid;grid-template-columns:1.1fr 1fr;gap:clamp(32px,6vw,110px);align-items:end}
.grid2-top{align-items:start}

/* ---------- header ---------- */
.hdr{position:fixed;top:0;left:0;right:0;z-index:60;display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:20px var(--pad);border-bottom:1px solid transparent;
  transition:transform .6s var(--ease),background .4s,padding .4s,border-color .4s}
.hdr.is-solid{background:rgba(7,22,30,.70);-webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);padding-top:12px;padding-bottom:12px;border-color:var(--line)}
.hdr.is-hidden{transform:translateY(-110%)}
.brand{display:flex;align-items:center;gap:13px;text-decoration:none;color:var(--ink);flex-shrink:0}
.brand>img:first-child{width:42px;height:42px}
.brand .brand-w{height:31px;width:auto}
.nav{display:flex;gap:clamp(18px,2.2vw,34px)}
.nav a{color:var(--ink2);text-decoration:none;font-size:14px;font-weight:500;letter-spacing:.01em;position:relative;padding:6px 0;transition:color .3s;white-space:nowrap}
.nav a::after{content:'';position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--cu);transform:scaleX(0);transform-origin:right;transition:transform .55s var(--ease)}
.nav a:hover,.nav a.is-active{color:var(--ink)}
.nav a:hover::after,.nav a.is-active::after{transform:scaleX(1);transform-origin:left}
.hdr-r{display:flex;align-items:center;gap:14px}
.lang{display:flex;border:1px solid var(--line2);border-radius:999px;padding:3px;background:rgba(7,22,30,.35)}
.lang button{background:none;border:0;color:var(--muted);font:600 11.5px/1 var(--f-b);letter-spacing:.05em;padding:8px 11px;border-radius:999px;cursor:pointer;transition:background .3s,color .3s}
.lang button:hover{color:var(--ink)}
.lang button.is-on{background:var(--ink);color:var(--bg)}

/* ---------- buttons ---------- */
.btn{--h:56px;display:inline-flex;align-items:center;justify-content:center;gap:12px;height:var(--h);padding:0 30px;border-radius:999px;
  background:var(--cu);color:#1b0d02;font:700 15px/1 var(--f-b);letter-spacing:.01em;text-decoration:none;border:0;cursor:pointer;
  position:relative;overflow:hidden;isolation:isolate;transition:box-shadow .45s,background .3s;box-shadow:0 12px 44px -12px var(--cu-glow);will-change:transform}
.btn::before{content:'';position:absolute;inset:0;z-index:-1;background:linear-gradient(115deg,transparent 30%,rgba(255,255,255,.5) 50%,transparent 70%);transform:translateX(-130%);transition:transform 1s var(--ease)}
.btn:hover::before{transform:translateX(130%)}
.btn:hover{box-shadow:0 16px 54px -10px rgba(226,133,43,.65)}
.btn .arr{display:inline-block;transition:transform .45s var(--ease)}
.btn:hover .arr{transform:translateX(5px)}
.btn-ghost{background:rgba(230,238,240,.05);color:var(--ink);border:1px solid var(--line2);box-shadow:none;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
.btn-ghost::before{background:linear-gradient(115deg,transparent 30%,rgba(255,255,255,.12) 50%,transparent 70%)}
.btn-ghost:hover{border-color:rgba(230,238,240,.45);box-shadow:none}
.btn-sm{--h:42px;padding:0 20px;font-size:13.5px}

/* ---------- hero ---------- */
.hero{min-height:100vh;min-height:100svh;display:flex;flex-direction:column;justify-content:center;padding:130px 0 120px;position:relative}
.eyebrow{display:inline-flex;align-items:center;gap:14px;font:600 12px/1.3 var(--f-b);letter-spacing:.28em;text-transform:uppercase;color:var(--cu2);margin-bottom:30px}
.eyebrow::before{content:'';width:36px;height:1px;background:var(--cu);flex-shrink:0}
.h1{font-family:var(--f-d);font-weight:500;font-size:clamp(44px,7.4vw,118px);line-height:1;letter-spacing:-.03em;max-width:12ch}
.h1 em,.h2 em{font-style:normal;background:linear-gradient(100deg,var(--cu) 0%,#FFC985 45%,var(--cu) 90%);background-size:220% 100%;
  -webkit-background-clip:text;background-clip:text;color:transparent;animation:shine 7s linear infinite}
@keyframes shine{from{background-position:0% 0}to{background-position:-220% 0}}
.lead{max-width:540px;margin-top:32px;font-size:clamp(16px,1.3vw,19px);color:var(--ink2)}
.hero-cta{display:flex;gap:14px;margin-top:42px;flex-wrap:wrap}
.hero-foot{position:absolute;left:0;right:0;bottom:34px}
.hero-foot .wrap{display:flex;justify-content:space-between;align-items:center;gap:20px}
.scroll-hint{display:flex;align-items:center;gap:14px;font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.mouse{width:22px;height:35px;border:1.5px solid rgba(230,238,240,.55);border-radius:12px;position:relative;flex-shrink:0}
.mouse::after{content:'';position:absolute;left:50%;top:7px;width:3px;height:8px;border-radius:2px;background:var(--cu);transform:translateX(-50%);animation:wheel 1.9s var(--ease) infinite}
@keyframes wheel{0%{opacity:0;transform:translate(-50%,-3px)}30%{opacity:1}100%{opacity:0;transform:translate(-50%,11px)}}
.coords{font-family:var(--f-m);font-size:10px;letter-spacing:.32em;color:var(--muted)}

/* ---------- headings ---------- */
.kicker{display:flex;align-items:center;gap:14px;font-size:12px;letter-spacing:.24em;text-transform:uppercase;color:var(--muted);margin-bottom:26px}
.kicker span{font-family:var(--f-m);color:var(--cu);letter-spacing:.08em}
.kicker b{font-weight:600}
.kicker::after{content:'';flex:0 0 64px;height:1px;background:var(--line2)}
.h2{font-family:var(--f-d);font-weight:500;font-size:clamp(32px,4.5vw,68px);line-height:1.06;letter-spacing:-.025em;max-width:15ch}
.sec-head{display:grid;grid-template-columns:1.3fr 1fr;gap:40px;align-items:end}
.sec-lead{text-shadow:0 2px 20px rgba(7,22,30,.95),0 0 2px rgba(7,22,30,.8);color:var(--ink2);font-size:clamp(16px,1.25vw,18px);max-width:440px;margin-top:22px}

/* ---------- about ---------- */
.about-txt{padding:clamp(22px,2.6vw,36px);background:var(--glass);border:1px solid var(--line);border-radius:var(--r);-webkit-backdrop-filter:blur(18px) saturate(130%);backdrop-filter:blur(18px) saturate(130%)}
.about-txt p{color:var(--ink2);font-size:clamp(16px,1.22vw,18px)}
.about-txt p+p{margin-top:18px}
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:clamp(56px,7vw,96px)}
.glass{background:var(--glass);border:1px solid var(--line);border-radius:var(--r);-webkit-backdrop-filter:blur(18px) saturate(130%);backdrop-filter:blur(18px) saturate(130%)}
.card,.act{position:relative;overflow:hidden;transition:border-color .5s}
.card::before,.act::before{content:'';position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .45s;
  background:radial-gradient(420px circle at var(--mx,50%) var(--my,50%),rgba(226,133,43,.16),transparent 45%)}
.card:hover::before,.act:hover::before{opacity:1}
.card:hover,.act:hover{border-color:rgba(226,133,43,.38)}
.card{padding:34px 30px 36px}
.ico{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;border:1px solid var(--line2);color:var(--cu2);background:rgba(226,133,43,.05)}
.ico svg{width:30px;height:30px}
.card .ico{margin-bottom:28px}
.card h3,.act h3,.val h3{font-family:var(--f-d);font-weight:500;font-size:19px;line-height:1.25;letter-spacing:-.01em;margin-bottom:12px}
.card p,.act p,.val p{color:var(--muted);font-size:15.5px;line-height:1.6}

/* ---------- marquee ---------- */
.marquee{position:relative;z-index:3;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:24px 0;overflow:hidden;background:rgba(7,22,30,.45);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.mq-track{display:flex;width:max-content;animation:mq 46s linear infinite}
.mq-track span{font-family:var(--f-d);font-weight:300;font-size:clamp(26px,3.4vw,48px);line-height:1.2;white-space:nowrap;padding-right:.7em;color:transparent;-webkit-text-stroke:1px rgba(230,238,240,.38)}
.mq-track span i{font-style:normal;color:var(--cu);-webkit-text-stroke:0;padding-left:.7em}
@keyframes mq{to{transform:translateX(-50%)}}

/* ---------- activity ---------- */
.acts{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:64px;perspective:1200px}
.act{padding:30px 26px 32px;min-height:400px;display:flex;flex-direction:column;transform-style:preserve-3d;transition:transform .7s var(--ease),border-color .5s;will-change:transform}
.act .num{font-family:var(--f-m);font-size:12px;color:var(--cu);letter-spacing:.1em}
.act .ico{margin:28px 0 auto}
.act h3{margin-top:44px;min-height:2.5em}
.act .bar{display:block;height:2px;background:var(--line);margin-top:auto;position:relative;overflow:hidden;top:14px}
.act .bar::after{content:'';position:absolute;inset:0;background:var(--cu);transform:scaleX(0);transform-origin:left;transition:transform .9s var(--ease)}
.act:hover .bar::after{transform:scaleX(1)}

/* ---------- process ---------- */
.process{position:relative;height:340vh;z-index:3}
.proc-sticky{position:sticky;top:0;height:100vh;height:100svh;display:flex;align-items:center;overflow:hidden}
.proc-in{display:grid;grid-template-columns:1fr 90px 1.05fr;gap:clamp(20px,3vw,48px);align-items:center}
.proc-hint{margin-top:24px;color:var(--muted);font-size:14px;max-width:340px}
.proc-well{position:relative;height:60vh;width:2px;margin:0 auto;background:var(--line2);border-radius:2px}
.proc-fill{position:absolute;left:0;top:0;width:100%;height:100%;background:linear-gradient(180deg,var(--cu2),var(--cu));transform-origin:top;transform:scaleY(var(--p,0));box-shadow:0 0 16px var(--cu)}
.proc-drop{position:absolute;left:50%;top:calc(var(--p,0) * 100%);width:22px;height:30px;transform:translate(-50%,-6px);fill:var(--cu);filter:drop-shadow(0 0 12px rgba(226,133,43,.8))}
.stages{list-style:none;display:grid;gap:clamp(14px,3vh,30px)}
.stage{display:grid;grid-template-columns:58px 1fr;column-gap:16px;padding:18px 22px;border-radius:18px;border:1px solid transparent;opacity:.32;
  transition:opacity .6s,transform .7s var(--ease),background .6s,border-color .6s}
.stage.is-on{opacity:1;transform:translateX(12px);background:var(--glass);border-color:var(--line);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}
.st-n{font-family:var(--f-m);font-size:13px;color:var(--cu);padding-top:7px}
.stage h3{font-family:var(--f-d);font-weight:500;font-size:clamp(20px,1.9vw,27px);letter-spacing:-.015em;line-height:1.2}
.stage p{grid-column:2;color:var(--muted);font-size:15.5px;margin-top:6px;max-width:440px}

/* ---------- values ---------- */
.vals{display:grid;grid-template-columns:repeat(4,1fr);margin-top:60px;overflow:hidden}
.val{padding:38px 30px 40px;border-right:1px solid var(--line);position:relative;transition:background .5s}
.val:last-child{border-right:0}
.val:hover{background:rgba(226,133,43,.05)}
.vn{display:block;font-family:var(--f-m);font-size:12px;color:var(--cu);margin-bottom:46px;letter-spacing:.08em}

/* ---------- contact ---------- */
.clist{margin-top:40px}
.cl-item{display:flex;flex-direction:column;gap:6px;padding:20px 0;border-bottom:1px solid var(--line)}
.cl-item span{font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.cl-item a,.cl-item b{font-family:var(--f-d);font-weight:400;font-size:clamp(18px,1.7vw,23px);color:var(--ink);text-decoration:none;word-break:break-word;transition:color .3s}
.cl-item a:hover{color:var(--cu2)}
.form{padding:clamp(22px,3vw,42px);display:grid;gap:14px}
.field{position:relative}
.field input,.field textarea{width:100%;background:rgba(230,238,240,.035);border:1px solid var(--line2);border-radius:14px;padding:24px 18px 10px;color:var(--ink);font:500 16px/1.5 var(--f-b);outline:none;transition:border-color .3s,background .3s;resize:vertical;-webkit-appearance:none;appearance:none}
.field textarea{min-height:130px}
.field label{position:absolute;left:19px;top:17px;color:var(--muted);font-size:15px;pointer-events:none;transition:all .28s var(--ease)}
.field input:focus,.field textarea:focus{border-color:var(--cu);background:rgba(226,133,43,.05)}
.field input:focus+label,.field input:not(:placeholder-shown)+label,.field textarea:focus+label,.field textarea:not(:placeholder-shown)+label{top:8px;font-size:11px;letter-spacing:.08em;color:var(--cu2)}
.field.is-err input,.field.is-err textarea{border-color:#E5533D}
.form .btn{width:100%;margin-top:6px}
.form-note{font-size:12.5px;color:var(--muted);text-align:center}

/* ---------- footer ---------- */
.ftr{padding:90px 0 40px;border-top:1px solid var(--line);background:linear-gradient(180deg,rgba(7,22,30,.2),rgba(4,12,16,.92))}
.ftr-logo{width:min(600px,100%);height:auto;opacity:.96;margin-left:calc(min(600px,100%) * -0.066)}
.ftr-row{display:flex;justify-content:space-between;align-items:center;gap:16px 30px;margin-top:56px;font-size:13px;color:var(--muted);flex-wrap:wrap}
.ftr-row a{color:var(--ink2);text-decoration:none;transition:color .3s}
.ftr-row a:hover{color:var(--cu2)}

/* ---------- burger + mobile nav ---------- */
.burger{display:none;width:46px;height:46px;border-radius:50%;border:1px solid var(--line2);background:rgba(7,22,30,.45);position:relative;cursor:pointer;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
.burger span{position:absolute;left:14px;right:14px;height:1.6px;background:var(--ink);border-radius:2px;transition:transform .5s var(--ease),top .5s var(--ease)}
.burger span:nth-child(1){top:18px}
.burger span:nth-child(2){top:26px}
body.menu-open .burger span:nth-child(1){top:22px;transform:rotate(45deg)}
body.menu-open .burger span:nth-child(2){top:22px;transform:rotate(-45deg)}
.mnav{position:fixed;inset:0;z-index:55;background:rgba(6,18,25,.94);-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);
  display:flex;flex-direction:column;justify-content:space-between;padding:104px var(--pad) calc(30px + env(safe-area-inset-bottom));opacity:0;visibility:hidden;transition:opacity .5s var(--ease),visibility .5s}
body.menu-open{overflow:hidden}
body.menu-open .mnav{opacity:1;visibility:visible}
.mnav-links{display:flex;flex-direction:column}
.ml{display:flex;justify-content:space-between;align-items:baseline;font-family:var(--f-d);font-weight:400;font-size:clamp(26px,7.5vw,40px);color:var(--ink);text-decoration:none;padding:16px 0;border-bottom:1px solid var(--line);
  opacity:0;transform:translateY(24px);transition:opacity .6s var(--ease),transform .7s var(--ease);transition-delay:calc(var(--i) * 60ms)}
.ml em{font-style:normal;font-family:var(--f-m);font-size:11px;color:var(--cu)}
body.menu-open .ml{opacity:1;transform:none}
.mnav-foot{display:flex;flex-direction:column;gap:16px}
.lang-lg{align-self:flex-start}
.lang-lg button{font-size:13px;padding:10px 16px}
.mnav-foot .btn{width:100%}

/* ---------- reveal (JS adds .js) ---------- */
.js [data-reveal],.js [data-hero]{opacity:0}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .acts{grid-template-columns:repeat(2,1fr)}
  .act{min-height:340px}
  .vals{grid-template-columns:repeat(2,1fr)}
  .val:nth-child(2){border-right:0}
  .val:nth-child(-n+2){border-bottom:1px solid var(--line)}
}
@media (max-width:1020px){
  .nav,.hdr-r>.btn-sm,.hdr-r>.lang{display:none}
  .burger{display:block}
}
@media (max-width:900px){
  .shade{background:
    linear-gradient(180deg,rgba(7,22,30,.15) 0%,rgba(7,22,30,.55) 45%,rgba(7,22,30,.86) 100%),
    radial-gradient(130% 80% at 50% 30%,transparent 0%,rgba(7,22,30,.6) 100%)}
  .grid2,.sec-head{grid-template-columns:1fr;align-items:start}
  .cards3{grid-template-columns:1fr}
  .process{height:auto;padding:110px 0 40px}
  .proc-sticky{position:relative;height:auto;display:block;overflow:visible}
  .proc-in{grid-template-columns:1fr;gap:34px}
  .proc-well{display:none}
  .stages{gap:14px;position:relative;padding-left:22px}
  .stages::before{content:'';position:absolute;left:0;top:10px;bottom:10px;width:2px;background:var(--line2);border-radius:2px}
  .stages::after{content:'';position:absolute;left:0;top:10px;width:2px;height:calc((100% - 20px) * var(--p,0));background:var(--cu);box-shadow:0 0 12px var(--cu);border-radius:2px}
  .stage{opacity:.45;padding:18px 18px}
  .stage.is-on{transform:none}
}
@media (max-width:760px){
  body{font-size:16px}
  .hdr{padding:14px var(--pad)}
  .hdr.is-solid{padding-top:10px;padding-bottom:10px}
  .brand>img:first-child{width:38px;height:38px}
  .brand .brand-w{height:26px}
  .hero{justify-content:flex-end;padding:120px 0 128px}
  .h1{font-size:clamp(40px,12.4vw,64px)}
  .eyebrow{font-size:10.5px;letter-spacing:.22em;margin-bottom:22px}
  .lead{margin-top:22px}
  .hero-cta{flex-direction:column;margin-top:30px}
  .hero-cta .btn{width:100%}
  .coords{display:none}
  .hero-foot{bottom:28px}
  .acts{grid-template-columns:1fr;margin-top:44px}
  .act{min-height:0}
  .act .ico{margin:22px 0 0}
  .act h3{margin-top:26px;min-height:0}
  .act .bar{margin-top:24px;top:0}
  .vals{grid-template-columns:1fr}
  .val{border-right:0;border-bottom:1px solid var(--line);padding:28px 24px 30px}
  .val:last-child{border-bottom:0}
  .vn{margin-bottom:18px}
  .card{padding:28px 24px 30px}
  .kicker::after{flex-basis:40px}
  .ftr{padding:64px 0 calc(30px + env(safe-area-inset-bottom))}
  .ftr-row{flex-direction:column;align-items:flex-start;margin-top:40px}
}
@media (prefers-reduced-motion:reduce){
  .grain,.mq-track,.h1 em,.h2 em{animation:none}
  *{transition-duration:.01ms!important}
}