/* =========================================================
   GUOBAILING — ALUFIRE replica, measured from alufire.com
   Layout map (same order as the original):
   1 split hero: media left / featured product lines right
   2 about: centered statement + full-height side image
   3 featured product: inset dark panel, 100px title, TOP FEATURES
   4 project: full-bleed image + CLICK AND HOLD + meta right
   5 trust: big statement + 3 columns
   6 news: black section, 3 posts
   fixed right rail + logo top-left (no top nav bar) — as the original
   ========================================================= */
:root{
  --bg:#EBEBEB;
  --panel:#2A2A28;
  --ink:#1D1D1B;
  --grey:#585858;
  --red:#F3784D;
  --white:#fff;
  --sans:"Helvetica Neue",Helvetica,Arial,sans-serif;
  --pad:clamp(18px,3.2vw,40px);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:auto}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--red);color:#fff}
:focus-visible{outline:2px solid var(--red);outline-offset:3px}

/* logo + right rail (fixed, like the original) */
.logo{position:fixed;left:var(--pad);top:clamp(18px,3vw,38px);z-index:90;color:var(--red);font-weight:700;font-size:clamp(18px,1.5vw,24px);letter-spacing:.06em;text-transform:uppercase}
.logo sup{font-size:.45em;top:-.8em;position:relative}
.rail{position:fixed;right:0;top:0;bottom:0;width:72px;background:#fff;border-left:1px solid rgba(0,0,0,.06);z-index:95;display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:18px 0}
.rail .icons{display:flex;flex-direction:column;gap:0;width:100%}
.rail a{width:100%;height:64px;display:grid;place-items:center;border-bottom:1px solid rgba(0,0,0,.06);color:#1D1D1B}
.rail a:hover{color:var(--red)}
.rail .menu{width:100%;height:64px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;border-top:1px solid rgba(0,0,0,.06);font-size:8.5px;letter-spacing:.16em;text-transform:uppercase;color:#1D1D1B}
.rail .menu b{display:block;width:18px;height:2px;background:currentColor;box-shadow:0 5px 0 currentColor,0 -5px 0 currentColor}

/* 1 — split hero */
.hero{display:grid;grid-template-columns:1fr 1fr;height:100vh;min-height:620px}
.hero-media{position:relative;background:#0E0E0D;overflow:hidden}
.hero-media img{width:100%;height:100%;object-fit:cover;opacity:.9}
.hero-media::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(0,0,0,.72),rgba(0,0,0,.25))}
.hero-copy{position:absolute;left:var(--pad);top:50%;transform:translateY(-50%);z-index:2;color:#fff;max-width:420px}
.hero-copy .k{font-size:12px;line-height:1.5;letter-spacing:.06em;text-transform:uppercase;color:rgba(255,255,255,.7);margin:0 0 14px}
.hero-copy h1{font-size:clamp(30px,3.2vw,46px);line-height:1.08;font-weight:400;letter-spacing:-.01em;margin:0}
.hero-copy h1 b{font-weight:700}
.hero-copy .arrow{margin-top:26px;display:inline-block;font-size:22px}
.hero-media .play{position:absolute;right:34px;bottom:34px;z-index:2;min-height:48px;padding:0 18px;border:1px solid rgba(255,255,255,.6);display:inline-flex;align-items:center;gap:12px;color:#fff;font-size:10px;letter-spacing:.12em;text-transform:uppercase;text-align:center;line-height:1.3;transition:background .25s ease,border-color .25s ease}
.hero-media .play:hover{background:var(--red);border-color:var(--red)}
.hero-panel{background:#000;color:#fff;position:relative;display:flex;flex-direction:column;justify-content:center;padding:clamp(24px,4vw,64px) clamp(90px,7vw,120px)}
.hero-panel .k{text-align:center;font-size:12px;letter-spacing:.06em;color:rgba(255,255,255,.55);text-transform:uppercase;margin:0 0 28px}
.hero-panel .lines{display:grid;grid-template-columns:1fr 1fr;gap:clamp(18px,3vw,46px);margin-top:40px}
.hero-panel .line img{width:100%;aspect-ratio:1/1.05;object-fit:cover;background:#111}
.hero-panel .line h3{font-size:22px;font-weight:400;margin:16px 0 8px}
.hero-panel .line p{font-size:13px;line-height:1.5;color:rgba(255,255,255,.55);margin:0}

/* 2 — about */
.about{position:relative;min-height:100vh;display:grid;grid-template-columns:1fr clamp(300px,30vw,480px)}
.about-txt{display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:10vh var(--pad);}
.about-txt h2{font-size:clamp(30px,3.2vw,50px);line-height:1.2;font-weight:400;max-width:820px;margin:0}
.about-txt h2 u{text-decoration:none;border-bottom:2px solid var(--red);padding-bottom:2px}
.about-txt p{max-width:560px;color:#3B3B38;font-size:14px;line-height:1.65;margin:26px auto 0}
.about-txt .btn-line{margin-top:34px;border:1px solid #8B8B86;min-width:150px;height:52px;display:inline-flex;align-items:center;justify-content:center;font-size:12.5px;letter-spacing:.06em;text-transform:uppercase}
.about-txt .btn-line:hover{background:#fff;border-color:#fff}
.about-media img{width:100%;height:100%;object-fit:cover;display:block}

/* 3 — featured product panel */
.featured{padding:clamp(40px,6vw,100px) clamp(40px,6vw,100px) clamp(30px,4vw,60px)}
.featured .panel{background:var(--panel);min-height:min(70vh,720px);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:#fff;padding:60px 24px;position:relative;overflow:hidden}
.featured .panel .art{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.14;pointer-events:none}
.featured .panel .k{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--red);margin:0 0 22px;position:relative}
.featured .panel .sub{font-size:15px;letter-spacing:.06em;text-transform:uppercase;color:rgba(255,255,255,.8);margin:0 0 8px;position:relative}
.featured .panel h2{font-size:clamp(52px,7vw,100px);line-height:.95;font-weight:400;letter-spacing:-.02em;margin:0 0 40px;position:relative}
.featured .panel .tf{background:#4A4A46;color:#fff;min-width:150px;height:58px;display:inline-flex;align-items:center;justify-content:center;font-size:12px;letter-spacing:.08em;text-transform:uppercase;position:relative}
.featured .panel .tf:hover{background:var(--red)}
.featured .all{display:block;text-align:center;margin-top:26px;font-size:12.5px;letter-spacing:.06em;text-transform:uppercase;border-bottom:1px solid currentColor;width:max-content;margin-left:auto;margin-right:auto;padding-bottom:3px}
.featured .all:hover{color:var(--red);border-color:var(--red)}

/* 4 — project */
.project{position:relative;height:100vh;min-height:560px;overflow:hidden;background:#0B0B0A;color:#fff}
.project>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.85}
.project .top{clip-path:inset(0 50% 0 0)}
.project::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.55),rgba(0,0,0,.1) 60%,rgba(0,0,0,.55))}
.project .ptitle{position:absolute;left:var(--pad);top:46%;z-index:2;max-width:520px}
.project .ptitle .k{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.65);margin:0 0 10px}
.project .ptitle h3{font-size:clamp(22px,2vw,32px);font-weight:400;line-height:1.25;margin:0 0 14px}
.project .ptitle .based{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.6)}
.project .ptitle .arrow{display:block;margin-top:18px;font-size:20px}
.project .hold{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:2;width:96px;height:96px;border-radius:50%;border:1px solid rgba(255,255,255,.6);display:grid;place-items:center;text-align:center;font-size:10px;letter-spacing:.12em;text-transform:uppercase;line-height:1.3;cursor:ew-resize;user-select:none}
.project .meta{position:absolute;right:calc(var(--pad) + 60px);top:44%;z-index:2;display:grid;gap:26px;min-width:220px}
.project .meta .m{border-top:1px solid rgba(255,255,255,.4);padding-top:8px}
.project .meta dt{font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:rgba(255,255,255,.55);margin:0}
.project .meta dd{margin:6px 0 0;font-size:20px}
.project .pall{position:absolute;right:calc(var(--pad) + 60px);bottom:34px;z-index:2;font-size:12px;letter-spacing:.06em;text-transform:uppercase;border-bottom:1px solid currentColor;padding-bottom:2px}

/* 5 — trust */
.trust{padding:clamp(60px,8vw,120px) var(--pad)}
.trust h2{font-size:clamp(30px,3.2vw,50px);line-height:1.15;font-weight:400;max-width:560px;margin:0 0 clamp(40px,6vw,80px)}
.trust .cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(24px,4vw,64px);max-width:1080px}
.trust h3{font-size:clamp(20px,2vw,30px);line-height:1.33;font-weight:400;margin:0 0 14px;max-width:310px}
.trust p{font-size:13.5px;line-height:1.6;color:var(--grey);margin:0;max-width:310px}

/* 6 — news */
.news{background:#000;color:#fff;padding:clamp(50px,7vw,100px) clamp(30px,6vw,100px)}
.news .grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,48px)}
.news .post{display:block}
.news .post .d{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.45);margin-bottom:12px}
.news .post h3{font-size:clamp(18px,1.7vw,25px);line-height:1.3;font-weight:400;margin:0;transition:color .2s}
.news .post:first-child h3{color:var(--red);font-size:clamp(22px,2.3vw,35px)}
.news .post:hover h3{color:var(--red)}
.news .allnews{margin-top:44px;display:inline-flex;align-items:center;height:64px;padding:0 26px;background:#333;color:#fff;font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.news .allnews:hover{background:var(--red)}

/* footer */
footer{background:var(--bg);padding:clamp(36px,4vw,60px) var(--pad) 24px;border-top:1px solid rgba(0,0,0,.1)}
footer .cols{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:clamp(16px,3vw,48px);padding-bottom:28px;border-bottom:1px solid rgba(0,0,0,.1)}
footer .brand{color:var(--red);font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:16px;margin-bottom:10px}
footer p{font-size:12px;color:var(--grey);max-width:300px;margin:0;line-height:1.6}
footer h4{font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--grey);margin:0 0 10px;font-weight:500}
footer a{display:block;font-size:12.5px;padding:3px 0}
footer span{display:block;font-size:12.5px;padding:3px 0;color:var(--grey)}
footer a:hover{color:var(--red)}
footer .bot{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;padding-top:16px;font-size:11px;color:var(--grey)}

/* modal */
.modal{position:fixed;inset:0;z-index:200;display:none;background:rgba(0,0,0,.88);color:#fff;padding:clamp(24px,5vw,72px);overflow:auto}
.modal.on{display:block}
.modal .x{position:absolute;right:28px;top:22px;font-size:26px;color:#fff}
.modal .k{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--red);margin:0 0 24px}
.modal h2{font-size:clamp(30px,4vw,56px);font-weight:400;margin:0 0 34px}
.modal .rows{display:grid;gap:0;max-width:1000px}
.modal .row{display:grid;grid-template-columns:80px 1fr 1fr;gap:clamp(16px,3vw,40px);padding:22px 0;border-top:1px solid rgba(255,255,255,.2)}
.modal .row .n{font-size:24px;color:var(--red)}
.modal .row h3{font-size:22px;margin:0 0 6px;font-weight:400}
.modal .row .v{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.6)}
.modal .row p{margin:0;font-size:13.5px;color:rgba(255,255,255,.7);line-height:1.6}

/* product specification section */
.specs-section{padding:clamp(40px,6vw,90px) var(--pad);background:#fff}
.specs-k{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--red);margin:0 0 14px}
.specs-title{font-size:clamp(26px,3vw,44px);font-weight:400;margin:0 0 14px;max-width:820px}
.specs-intro{max-width:760px;color:var(--grey);font-size:13px;line-height:1.6;margin:0 0 22px}
.specs-scroll{overflow-x:auto;overscroll-behavior-x:contain}
.specs-table{width:100%;border-collapse:collapse;font-size:13.5px;min-width:760px}
.specs-table th,.specs-table td{text-align:left;padding:10px 12px;border-bottom:1px solid #DEDBD1;vertical-align:top}
.specs-table th{font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:#6B6F76;font-weight:500}
.range-note{margin:0 var(--pad) 14px;color:var(--grey);font-size:12px}
.compare-notice,.download-note{font-size:12px;line-height:1.6;color:var(--grey);margin:0 0 14px}

@media (max-width:1024px){
  .rail{display:none}
  .hero{grid-template-columns:1fr;height:auto}
  .hero-media{min-height:70vh}
  .hero-panel{padding:40px var(--pad) 60px}
  .hero-panel .k{position:static;text-align:left;margin-bottom:20px}
  .about{grid-template-columns:1fr}
  .about-media{height:60vh}
  .featured{padding:24px var(--pad) 30px}
  .project .meta{right:var(--pad);top:auto;bottom:90px;grid-template-columns:1fr 1fr;display:grid}
  .trust .cols{grid-template-columns:1fr}
  .news .grid{grid-template-columns:1fr}
  footer .cols{grid-template-columns:1fr 1fr}
  .modal .row{grid-template-columns:44px 1fr}
  .modal .row p{grid-column:2}
}