/* ============================================================
   NEISEN · Baoye Curtain Wall  —  Design System
   High-end architectural facade website
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Neutrals */
  --ink:      #0B0C0E;   /* near-black */
  --graphite: #15171B;
  --carbon:   #22262C;
  --steel:    #6B7280;   /* mid gray */
  --silver:   #C7CCD3;
  --mist:     #EFF1F4;   /* light gray bg */
  --fog:      #F7F8FA;
  --paper:    #FFFFFF;

  /* Accent — restrained steel blue */
  --accent:      #2A4D6E;
  --accent-soft: #3E6B97;
  --accent-line: rgba(42, 77, 110, 0.18);

  /* Metallic gradient */
  --metal: linear-gradient(135deg, #9aa3ad 0%, #e8ebef 22%, #aab2bc 48%, #f2f4f6 70%, #9aa3ad 100%);

  /* Type */
  --font-display: "Space Grotesk", "Noto Sans SC", system-ui, sans-serif;
  --font-body:    "Inter", "Noto Sans SC", system-ui, sans-serif;
  --font-cn:      "Noto Sans SC", "Inter", sans-serif;

  /* Rhythm */
  --container: 1280px;
  --gutter: clamp(20px, 5vw, 80px);
  --section-y: clamp(72px, 10vw, 160px);

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --header-h: 84px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* lang-driven font */
html[lang="zh"] body { font-family: var(--font-cn); }

/* ---------- Layout helpers ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: var(--section-y); }
.section--tight { padding-block: clamp(48px, 6vw, 96px); }
.grid { display: grid; gap: clamp(20px, 3vw, 40px); }

/* ---------- Typography ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.02em;
}
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.015em; line-height: 1.08; }
.h-hero   { font-size: clamp(2.6rem, 7vw, 6rem); }
.h-1      { font-size: clamp(2.1rem, 4.6vw, 3.8rem); }
.h-2      { font-size: clamp(1.7rem, 3.2vw, 2.6rem); }
.h-3      { font-size: clamp(1.25rem, 2vw, 1.6rem); }
.lead     { font-size: clamp(1.05rem, 1.6vw, 1.35rem); color: var(--carbon); font-weight: 400; }
html[lang="zh"] .lead { line-height: 1.85; }

.eyebrow {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.eyebrow::before {
  content: ""; width: 28px; height: 1px; background: var(--accent); display: inline-block;
}
html[lang="zh"] .eyebrow { letter-spacing: 0.18em; }

.muted { color: var(--steel); }
.text-balance { text-wrap: balance; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 30px;
  font-family: var(--font-display);
  font-size: 0.92rem; font-weight: 500; letter-spacing: 0.02em;
  border-radius: 2px;
  transition: all .4s var(--ease);
  position: relative; overflow: hidden;
}
.btn svg { width: 16px; height: 16px; transition: transform .4s var(--ease); }
.btn:hover svg { transform: translateX(4px); }
.btn--solid { background: var(--ink); color: #fff; }
.btn--solid:hover { background: var(--accent); }
.btn--ghost { background: transparent; color: var(--ink); border: 1px solid rgba(11,12,14,.25); }
.btn--ghost:hover { border-color: var(--ink); background: var(--ink); color: #fff; }
.btn--light { background: rgba(255,255,255,.1); color: #fff; border: 1px solid rgba(255,255,255,.35); backdrop-filter: blur(6px); }
.btn--light:hover { background: #fff; color: var(--ink); border-color: #fff; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  transition: background .45s var(--ease), box-shadow .45s var(--ease), height .45s var(--ease);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 24px; }

/* transparent over hero, solid on scroll */
.site-header[data-mode="transparent"] { background: transparent; }
.site-header[data-mode="transparent"] .nav-link,
.site-header[data-mode="transparent"] .brand-text,
.site-header[data-mode="transparent"] .lang-toggle,
.site-header[data-mode="transparent"] .burger span { color: #fff; }
.site-header[data-mode="transparent"] .brand-mark { border-color: rgba(255,255,255,.4); color:#fff; }
.site-header[data-mode="transparent"] .burger span { background: #fff; }
.site-header[data-mode="transparent"] .lang-toggle { border-color: rgba(255,255,255,.35); }

.site-header[data-mode="solid"] {
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(16px) saturate(140%);
  box-shadow: 0 1px 0 rgba(11,12,14,.07);
  height: 70px;
}

/* Brand / dual logo */
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 44px; height: 44px; flex: none;
  background: #fff; border-radius: 3px;
  display: grid; place-items: center;
  padding: 7px 9px; position: relative;
  box-shadow: 0 1px 4px rgba(11,12,14,.12);
}
.brand-mark img { width: 100%; height: 100%; object-fit: contain; }
.site-header[data-mode="transparent"] .brand-mark { box-shadow: 0 2px 10px rgba(0,0,0,.18); }
.brand-text { line-height: 1.15; }
.brand-text .b-en { font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; letter-spacing: .02em; }
.brand-text .b-sub { font-size: .68rem; letter-spacing: .28em; text-transform: uppercase; color: var(--steel); display:block; }
.site-header[data-mode="transparent"] .brand-text .b-sub { color: rgba(255,255,255,.7); }

/* Nav */
.nav { display: flex; align-items: center; gap: 38px; }
.nav-list { display: flex; align-items: center; gap: 32px; }
.nav-link {
  font-family: var(--font-display); font-size: .9rem; font-weight: 500; letter-spacing: .01em;
  position: relative; padding: 6px 0; transition: opacity .3s;
}
.nav-link::after {
  content:""; position:absolute; left:0; bottom:0; height:1px; width:0; background: currentColor; transition: width .35s var(--ease);
}
.nav-link:hover::after, .nav-link[aria-current="page"]::after { width: 100%; }
.nav-link[aria-current="page"] { color: var(--accent); }
.site-header[data-mode="transparent"] .nav-link[aria-current="page"] { color: #fff; }

/* Lang toggle */
.lang-toggle {
  display: inline-flex; align-items: center;
  border: 1px solid rgba(11,12,14,.2); border-radius: 2px; overflow: hidden;
  font-family: var(--font-display); font-size: .8rem; font-weight: 500;
}
.lang-toggle button { padding: 7px 12px; transition: background .3s, color .3s; opacity: .55; }
.lang-toggle button[aria-pressed="true"] { background: var(--accent); color: #fff; opacity: 1; }

/* Burger */
.burger { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.burger span { width: 24px; height: 2px; background: var(--ink); transition: transform .4s var(--ease), opacity .3s; }
.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  position: fixed; inset: 0; z-index: 99;
  background: var(--ink); color: #fff;
  display: flex; flex-direction: column; justify-content: center; gap: 8px;
  padding: var(--gutter);
  transform: translateY(-100%); opacity: 0; visibility: hidden;
  transition: transform .6s var(--ease), opacity .5s, visibility .5s;
}
.mobile-menu.open { transform: translateY(0); opacity: 1; visibility: visible; }
.mobile-menu a {
  font-family: var(--font-display); font-size: clamp(1.8rem, 8vw, 3rem); font-weight: 600;
  padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,.12);
  display: flex; justify-content: space-between; align-items: center;
}

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: flex-end;
  color: #fff; overflow: hidden;
}
.hero__media { position: absolute; inset: 0; z-index: -2; }
.hero__media img { width: 100%; height: 100%; object-fit: cover; }
.hero__media::after {
  content:""; position:absolute; inset:0;
  background: linear-gradient(180deg, rgba(11,12,14,.55) 0%, rgba(11,12,14,.15) 35%, rgba(11,12,14,.78) 100%);
}
.hero__inner { padding-bottom: clamp(60px, 9vw, 120px); padding-top: calc(var(--header-h) + 40px); width: 100%; }
.hero h1 { max-width: 16ch; margin-top: 22px; }
.hero .lead { color: rgba(255,255,255,.82); max-width: 46ch; margin-top: 26px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 40px; }
.hero__scroll {
  position: absolute; right: var(--gutter); bottom: 40px;
  display: flex; align-items: center; gap: 12px; font-size: .72rem; letter-spacing: .2em; text-transform: uppercase;
  writing-mode: vertical-rl; opacity: .7;
}
.hero__scroll i { width:1px; height:48px; background:#fff; display:block; animation: scrollPulse 2s infinite; transform-origin: top; }
@keyframes scrollPulse { 0%,100%{ transform: scaleY(.3); opacity:.4 } 50%{ transform: scaleY(1); opacity:1 } }

/* ---------- Stat band ---------- */
.stats { background: var(--ink); color: #fff; }
.stats__grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: clamp(36px,5vw,68px) clamp(20px,3vw,44px); border-right: 1px solid rgba(255,255,255,.1); }
.stat:last-child { border-right: none; }
.stat__num { font-family: var(--font-display); font-size: clamp(2.4rem, 4.5vw, 4rem); font-weight: 600; line-height: 1; display:flex; align-items:baseline; }
.stat__num .suf { font-size: .5em; color: var(--accent-soft); margin-left: 6px; }
.stat__label { margin-top: 14px; font-size: .82rem; letter-spacing: .12em; text-transform: uppercase; color: rgba(255,255,255,.55); }
html[lang="zh"] .stat__label { letter-spacing: .06em; }

/* ---------- Section heading ---------- */
.sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; margin-bottom: clamp(40px, 5vw, 72px); flex-wrap: wrap; }
.sec-head__text { max-width: 60ch; }
.sec-head .h-1 { margin-top: 20px; }

/* ---------- Project grid ---------- */
.proj-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(16px, 2vw, 28px); }
.proj-card { position: relative; overflow: hidden; background: var(--mist); display:block; }
.proj-card--lg { grid-column: span 7; }
.proj-card--sm { grid-column: span 5; }
.proj-card--half { grid-column: span 6; }
.proj-card--third { grid-column: span 4; }
.proj-card__media { aspect-ratio: 4/3; overflow: hidden; }
.proj-card--lg .proj-card__media { aspect-ratio: 16/11; }
.proj-card__media img { width:100%; height:100%; object-fit: cover; transition: transform 1.1s var(--ease); }
.proj-card:hover .proj-card__media img { transform: scale(1.06); }
.proj-card__body {
  position: absolute; inset: auto 0 0 0; padding: clamp(20px,2.4vw,34px);
  color:#fff; z-index:2;
  background: linear-gradient(0deg, rgba(11,12,14,.85) 0%, rgba(11,12,14,.0) 100%);
}
.proj-card__meta { display:flex; gap: 14px; font-size:.74rem; letter-spacing:.14em; text-transform:uppercase; opacity:.8; margin-bottom: 10px; flex-wrap:wrap; }
.proj-card__meta span { position: relative; }
.proj-card__meta span:not(:last-child)::after { content:"/"; position:absolute; right:-9px; opacity:.5; }
.proj-card h3 { font-size: clamp(1.2rem, 2vw, 1.7rem); }
.proj-card__sys { margin-top: 8px; font-size:.82rem; color: rgba(255,255,255,.7); }
html[lang="zh"] .proj-card__meta { letter-spacing: .04em; }

/* ---------- Product split ---------- */
.prod-list { border-top: 1px solid var(--mist); }
.prod-row {
  display: grid; grid-template-columns: 80px 1.1fr 1fr auto; gap: clamp(20px,3vw,48px);
  align-items: center; padding: clamp(28px,3.5vw,52px) 0;
  border-bottom: 1px solid var(--mist); position: relative; transition: padding-left .5s var(--ease);
}
.prod-row:hover { padding-left: 16px; }
.prod-row__idx { font-family: var(--font-display); color: var(--silver); font-size: 1rem; font-weight: 500; }
.prod-row__title { font-family: var(--font-display); font-size: clamp(1.4rem, 2.6vw, 2.2rem); font-weight: 600; }
.prod-row__desc { color: var(--steel); font-size: .98rem; }
.prod-row__arrow { width: 52px; height: 52px; border:1px solid var(--mist); border-radius:50%; display:grid; place-items:center; transition: all .4s var(--ease); }
.prod-row:hover .prod-row__arrow { background: var(--ink); color:#fff; transform: rotate(-45deg); }

/* ---------- Feature cards ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(2px, .3vw, 4px); background: var(--mist); border: 1px solid var(--mist); }
.feature {
  background: var(--paper); padding: clamp(32px,3.5vw,52px);
  transition: background .5s var(--ease), color .5s var(--ease);
}
.feature:hover { background: var(--ink); color: #fff; }
.feature__icon { width: 44px; height: 44px; color: var(--accent); margin-bottom: 26px; transition: color .5s; }
.feature:hover .feature__icon { color: var(--accent-soft); }
.feature h3 { font-size: 1.3rem; margin-bottom: 14px; }
.feature p { color: var(--steel); font-size: .96rem; transition: color .5s; }
.feature:hover p { color: rgba(255,255,255,.7); }
.feature__num { font-family: var(--font-display); font-size:.8rem; letter-spacing:.2em; color: var(--silver); margin-bottom: 26px; display:block; }

/* ---------- Split feature (image + text) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(36px, 5vw, 90px); align-items: center; }
.split--reverse .split__media { order: 2; }
.split__media { position: relative; overflow: hidden; aspect-ratio: 4/5; }
.split__media img { width:100%; height:100%; object-fit: cover; }
.split__media--tall { aspect-ratio: 3/4; }
.split ul.ticks { margin-top: 28px; display: grid; gap: 14px; }
.split ul.ticks li { display:flex; gap:14px; align-items:flex-start; color: var(--carbon); }
.split ul.ticks li::before { content:""; width:18px; height:18px; flex:none; margin-top:4px; border:1px solid var(--accent); background: var(--accent-line); border-radius:2px; position:relative; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--ink); color:#fff; position: relative; overflow:hidden; }
.cta-band::before {
  content:""; position:absolute; inset:0; opacity:.5;
  background: radial-gradient(120% 120% at 80% 0%, rgba(62,107,151,.4) 0%, transparent 50%);
}
.cta-band .container { position: relative; }
.cta-band__inner { display:flex; align-items:flex-end; justify-content:space-between; gap:40px; flex-wrap:wrap; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: rgba(255,255,255,.7); padding-top: clamp(64px,7vw,110px); }
.footer-top { display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: clamp(28px,3vw,48px); padding-bottom: clamp(48px,6vw,80px); border-bottom:1px solid rgba(255,255,255,.1); }
.footer-brand .brand-mark { border-color: rgba(255,255,255,.4); color:#fff; }
.footer-brand .b-en { color:#fff; }
.footer-col h4 { font-size:.78rem; letter-spacing:.18em; text-transform:uppercase; color:rgba(255,255,255,.45); margin-bottom: 22px; }
.footer-col a { display:block; padding: 7px 0; color: rgba(255,255,255,.72); transition: color .3s; font-size:.96rem; }
.footer-col a:hover { color:#fff; }
.footer-bottom { display:flex; justify-content:space-between; align-items:center; gap:20px; padding-block: 30px; flex-wrap:wrap; font-size:.84rem; color: rgba(255,255,255,.45); }

/* ---------- Page hero (interior pages) ---------- */
.page-hero { position: relative; padding-top: calc(var(--header-h) + clamp(60px,8vw,120px)); padding-bottom: clamp(48px,6vw,90px); color:#fff; overflow:hidden; }
.page-hero__media { position:absolute; inset:0; z-index:-2; }
.page-hero__media img { width:100%; height:100%; object-fit: cover; }
.page-hero__media::after { content:""; position:absolute; inset:0; background: linear-gradient(180deg, rgba(11,12,14,.7), rgba(11,12,14,.55)); }
.page-hero h1 { max-width: 18ch; margin-top: 20px; }
.page-hero .lead { color: rgba(255,255,255,.8); max-width: 52ch; margin-top: 22px; }
.breadcrumb { display:flex; gap:10px; font-size:.8rem; letter-spacing:.05em; opacity:.7; margin-top: 6px; }
.breadcrumb a:hover { opacity:1; }

/* ---------- Filter bar ---------- */
.filter-bar { display:flex; gap: 8px; flex-wrap:wrap; margin-bottom: clamp(32px,4vw,56px); }
.filter-btn {
  padding: 10px 22px; border:1px solid var(--mist); border-radius: 40px;
  font-family: var(--font-display); font-size:.88rem; font-weight:500; color: var(--steel);
  transition: all .35s var(--ease);
}
.filter-btn:hover { border-color: var(--ink); color: var(--ink); }
.filter-btn[aria-pressed="true"] { background: var(--ink); color:#fff; border-color: var(--ink); }

/* ---------- Forms ---------- */
.form-grid { display:grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.field { display:flex; flex-direction: column; gap: 9px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size:.82rem; letter-spacing:.08em; text-transform:uppercase; color: var(--steel); font-family: var(--font-display); font-weight:500; }
.field input, .field select, .field textarea {
  font: inherit; font-size: 1rem; padding: 14px 16px;
  border: 1px solid var(--silver); border-radius: 2px; background: var(--paper); color: var(--ink);
  transition: border-color .3s, box-shadow .3s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-line);
}
.field textarea { resize: vertical; min-height: 140px; }
.field .err { color: #c0392b; font-size:.82rem; display:none; }
.field.invalid input, .field.invalid select, .field.invalid textarea { border-color: #c0392b; }
.field.invalid .err { display: block; }
.form-note { font-size:.86rem; color: var(--steel); }
.form-success { display:none; padding: 18px 22px; background: var(--accent-line); border-left: 3px solid var(--accent); color: var(--accent); font-weight:500; border-radius: 2px; }
.form-success.show { display:block; }

/* ---------- Info rows (contact) ---------- */
.info-row { display:flex; gap: 18px; padding: 26px 0; border-bottom:1px solid var(--mist); }
.info-row__icon { width:42px; height:42px; flex:none; color: var(--accent); }
.info-row h4 { font-size:.78rem; letter-spacing:.16em; text-transform:uppercase; color: var(--steel); margin-bottom:8px; }
.info-row p { font-size:1.05rem; color: var(--ink); }

/* ---------- Detail page ---------- */
.detail-meta { display:grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--mist); border:1px solid var(--mist); margin: clamp(40px,5vw,64px) 0; }
.detail-meta__item { background:var(--paper); padding: clamp(22px,2.5vw,32px); }
.detail-meta__item h4 { font-size:.74rem; letter-spacing:.16em; text-transform:uppercase; color:var(--steel); margin-bottom:10px; }
.detail-meta__item p { font-family: var(--font-display); font-weight:500; font-size:1.1rem; }
.masonry { columns: 2; column-gap: clamp(16px,2vw,24px); }
.masonry img { width:100%; margin-bottom: clamp(16px,2vw,24px); break-inside: avoid; }
.detail-block { display:grid; grid-template-columns: 1fr 1.6fr; gap: clamp(24px,4vw,72px); padding-block: clamp(36px,4vw,60px); border-top:1px solid var(--mist); }
.detail-block h3 { font-size: clamp(1.3rem,2vw,1.7rem); }
.detail-block p { color: var(--carbon); }

/* ---------- Logo cloud / certs ---------- */
.cert-grid { display:grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--mist); border:1px solid var(--mist); }
.cert { background: var(--paper); aspect-ratio: 3/2; display:grid; place-items:center; padding: 20px; text-align:center; }
.cert span { font-family: var(--font-display); font-weight:600; letter-spacing:.05em; color: var(--carbon); font-size:1.05rem; }
.cert small { display:block; color: var(--silver); font-size:.7rem; letter-spacing:.1em; margin-top:4px; text-transform:uppercase; }

/* ---------- Scroll reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(34px); transition: opacity .9s var(--ease-out), transform .9s var(--ease-out); }
[data-reveal].in { opacity: 1; transform: none; }
[data-reveal][data-delay="1"] { transition-delay: .08s; }
[data-reveal][data-delay="2"] { transition-delay: .16s; }
[data-reveal][data-delay="3"] { transition-delay: .24s; }
[data-reveal][data-delay="4"] { transition-delay: .32s; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity:1 !important; transform:none !important; }
  html { scroll-behavior: auto; }
}

/* parallax target */
[data-parallax] { will-change: transform; }

/* lang visibility utility (used sparingly; most text swapped by JS) */
.en-only { display: none; }
html[lang="en"] .en-only { display: revert; }
html[lang="zh"] .zh-only { display: revert; }
.zh-only { display: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.1); }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .cert-grid { grid-template-columns: repeat(3, 1fr); }
  .proj-card--lg, .proj-card--sm, .proj-card--half, .proj-card--third { grid-column: span 12; }
}
@media (max-width: 860px) {
  .nav-list { display: none; }
  .burger { display: flex; }
  .nav { gap: 16px; }
  .split, .split--reverse .split__media { grid-template-columns: 1fr; order: 0; }
  .split__media { aspect-ratio: 16/10; }
  .prod-row { grid-template-columns: 40px 1fr auto; }
  .prod-row__desc { display: none; }
  .detail-block { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .detail-meta { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .brand-mark { width: 40px; height: 40px; font-size: 1rem; }
  .brand-text .b-en { font-size: .92rem; }
  .brand-text .b-sub { letter-spacing: .12em; font-size: .6rem; white-space: nowrap; }
  .feature-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .masonry { columns: 1; }
  .cert-grid { grid-template-columns: repeat(2,1fr); }
  .stats__grid { grid-template-columns: 1fr 1fr; }
  .hero__scroll { display: none; }
}