/* =============================================================
   NasteSoft — "Signal Instrument"
   Tokens · Base · Layout · Components
   ============================================================= */

:root {
  /* — Color: warm petrol-black base, copper as the single bold accent — */
  --ink:        #0C1413;   /* page base */
  --ink-2:      #0A100F;   /* deepest */
  --surface:    #111C1A;   /* panels */
  --surface-2:  #16211E;   /* cards */
  --surface-3:  #1B2825;   /* raised */
  --line:       #253531;   /* hairlines */
  --line-soft:  #1C2B27;

  --paper:      #E8E9E3;   /* primary text */
  --muted:      #9BAAA3;   /* secondary text */
  --faint:      #6A7D76;   /* tertiary / captions */

  --copper:     #E08A4B;   /* THE accent */
  --copper-hi:  #F0A468;   /* hover / bright */
  --copper-dim: #B96E38;
  --signal:     #6FC9B6;   /* cool "live" accent — used sparingly */
  --signal-dim: #3E7D72;

  --glow-copper: rgba(224,138,75,0.16);
  --glow-signal: rgba(111,201,182,0.14);

  /* — Type — */
  --font-display: 'Bricolage Grotesque', 'Segoe UI', system-ui, sans-serif;
  --font-body:    'Instrument Sans', system-ui, -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, 'Cascadia Code', monospace;

  /* — Scale — */
  --step--1: clamp(0.80rem, 0.77rem + 0.15vw, 0.88rem);
  --step-0:  clamp(1.00rem, 0.96rem + 0.20vw, 1.13rem);
  --step-1:  clamp(1.25rem, 1.16rem + 0.45vw, 1.55rem);
  --step-2:  clamp(1.60rem, 1.42rem + 0.90vw, 2.30rem);
  --step-3:  clamp(2.10rem, 1.75rem + 1.75vw, 3.40rem);
  --step-4:  clamp(2.70rem, 2.05rem + 3.25vw, 5.30rem);

  /* — Space & shape — */
  --wrap: 1200px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 16px;
  --radius-lg: 22px;
  --radius-sm: 10px;
  --section-pad: clamp(2.25rem, 4vw, 3.5rem);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset-ish ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}
body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  font-feature-settings: "ss01", "cv01";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
::selection { background: var(--copper); color: var(--ink); }

/* ---------- Ambient background field ---------- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1100px 700px at 82% -8%, var(--glow-copper), transparent 60%),
    radial-gradient(900px 600px at 5% 8%, var(--glow-signal), transparent 55%),
    var(--ink);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 78%);
          mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 78%);
}

/* ---------- Layout primitives ---------- */
.wrap { width: min(100% - var(--gutter) * 2, var(--wrap)); margin-inline: auto; }
.section { padding-block: var(--section-pad); position: relative; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
}
.eyebrow::before {
  content: "";
  width: 26px; height: 1px;
  background: linear-gradient(90deg, var(--copper), transparent);
}
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.04; letter-spacing: -0.02em; margin: 0; }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-1); letter-spacing: -0.01em; }
p { margin: 0; }
.lead { font-size: var(--step-1); line-height: 1.5; color: var(--muted); font-weight: 400; }

.section-head { max-width: 62ch; margin-bottom: clamp(1.75rem, 3vw, 2.75rem); }
.section-head h2 { margin-top: 0.8rem; }
.section-head p { margin-top: 1.1rem; color: var(--muted); font-size: var(--step-1); line-height: 1.5; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.6em;
  padding: 0.85em 1.4em;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
  will-change: transform;
}
.btn:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }
.btn-primary { background: var(--copper); color: #1A0E04; font-weight: 600; }
.btn-primary:hover { background: var(--copper-hi); transform: translateY(-2px); }
.btn-ghost { border-color: var(--line); color: var(--paper); background: rgba(255,255,255,0.01); }
.btn-ghost:hover { border-color: var(--copper); color: var(--copper-hi); transform: translateY(-2px); }
.btn .arrow { transition: transform 0.25s var(--ease); }
.btn:hover .arrow { transform: translate(3px, -3px); }

/* =============================================================
   HEADER / NAV
   ============================================================= */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: color-mix(in srgb, var(--ink) 78%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line-soft);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 74px; }
.brand { display: inline-flex; align-items: center; gap: 0.7rem; font-family: var(--font-display); font-weight: 700; font-size: 1.28rem; letter-spacing: -0.02em; }
.brand svg { width: 30px; height: 30px; }
.brand .b-soft { color: var(--copper); }
.nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; margin: 0; padding: 0; }
.nav-links a { font-size: var(--step--1); color: var(--muted); transition: color 0.2s; position: relative; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; height: 1px; width: 0;
  background: var(--copper); transition: width 0.28s var(--ease);
}
.nav-links a:hover { color: var(--paper); }
.nav-links a:hover::after { width: 100%; }
.nav-cta { display: inline-flex; }
.nav-actions { display: flex; align-items: center; gap: 1.25rem; }

.nav-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); flex-direction: column; gap: 5px; align-items: center; justify-content: center; }
.nav-toggle span { width: 18px; height: 1.6px; background: var(--paper); transition: transform 0.3s var(--ease), opacity 0.2s; }

/* =============================================================
   HERO
   ============================================================= */
.hero { position: relative; padding-top: clamp(7rem, 12vh, 9rem); padding-bottom: clamp(1.75rem, 3.5vw, 3rem); overflow: hidden; }
#signal-canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; opacity: 0.9; }
.hero .wrap { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }

.hero-tag { display: inline-flex; align-items: center; gap: 0.6em; padding: 0.4em 0.9em; border: 1px solid var(--line); border-radius: 999px; background: color-mix(in srgb, var(--surface) 60%, transparent); font-family: var(--font-mono); font-size: var(--step--1); color: var(--muted); }
.hero-tag .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 0 var(--signal); animation: pulse 2.4s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(111,201,182,0.5);} 70% { box-shadow: 0 0 0 8px rgba(111,201,182,0);} 100% { box-shadow: 0 0 0 0 rgba(111,201,182,0);} }

.hero h1 { font-size: var(--step-4); margin-top: 1.5rem; letter-spacing: -0.035em; }
.hero h1 .accent { color: var(--copper); position: relative; }
.hero h1 em { font-style: normal; color: var(--signal); }
.hero-lead { margin-top: 1.6rem; max-width: 46ch; color: var(--muted); font-size: var(--step-1); line-height: 1.5; }
.hero-actions { margin-top: 2.4rem; display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-chips { margin-top: 2.8rem; display: flex; flex-wrap: wrap; gap: 0.6rem; max-width: 48ch; }
.chip { font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.02em; color: var(--muted); padding: 0.4em 0.8em; border: 1px solid var(--line-soft); border-radius: 8px; background: color-mix(in srgb, var(--surface) 50%, transparent); }
.chip b { color: var(--copper); font-weight: 500; }

/* Hero side: an instrument "readout" card */
.readout { position: relative; border: 1px solid var(--line); border-radius: var(--radius-lg); background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%); padding: 1.6rem; box-shadow: 0 30px 80px -40px rgba(0,0,0,0.8); }
.readout::before { content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px; background: linear-gradient(160deg, var(--copper), transparent 40%); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude; opacity: 0.5; pointer-events: none; }
.readout-head { display: flex; align-items: center; justify-content: space-between; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); padding-bottom: 1rem; border-bottom: 1px solid var(--line-soft); }
.readout-head .live { color: var(--signal); display: inline-flex; align-items: center; gap: 0.4em; }
.readout-head .live::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--signal); }
.readout-row { display: flex; align-items: baseline; justify-content: space-between; padding: 0.85rem 0; border-bottom: 1px solid var(--line-soft); }
.readout-row:last-child { border-bottom: 0; }
.readout-row .k { font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted); }
.readout-row .v { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; }
.readout-row .v .u { font-family: var(--font-mono); font-size: 0.72rem; color: var(--faint); font-weight: 400; margin-left: 0.3em; }

/* =============================================================
   SIGNAL SPINE (section markers)
   ============================================================= */
.node-label { display: inline-flex; align-items: center; gap: 0.7rem; font-family: var(--font-mono); font-size: var(--step--1); color: var(--faint); letter-spacing: 0.05em; margin-bottom: 1.5rem; }
.node-label .node { position: relative; width: 10px; height: 10px; }
.node-label .node::before { content:""; position:absolute; inset:0; border-radius:50%; border:1px solid var(--copper); }
.node-label .node::after { content:""; position:absolute; inset:3px; border-radius:50%; background: var(--copper); }

/* =============================================================
   SERVICES  (two pillars)
   ============================================================= */
.pillars { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(1.2rem, 3vw, 2rem); }
.pillar {
  position: relative; padding: clamp(1.8rem, 3vw, 2.6rem);
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--surface) 0%, color-mix(in srgb, var(--surface-2) 88%, var(--ink)) 100%);
  overflow: hidden; transition: transform 0.4s var(--ease), border-color 0.4s var(--ease);
}
.pillar::after { content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 100%; background: linear-gradient(90deg, var(--copper), transparent); transform: scaleX(0); transform-origin: left; transition: transform 0.5s var(--ease); }
.pillar:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--copper) 40%, var(--line)); }
.pillar:hover::after { transform: scaleX(1); }
.pillar .p-num { font-family: var(--font-mono); font-size: 0.8rem; color: var(--copper); letter-spacing: 0.1em; }
.pillar h3 { margin-top: 1rem; font-size: var(--step-2); }
.pillar > p { margin-top: 1rem; color: var(--muted); }
.pillar ul { list-style: none; margin: 1.6rem 0 0; padding: 0; display: grid; gap: 0.85rem; }
.pillar li { display: flex; gap: 0.75rem; font-size: var(--step--1); color: var(--paper); align-items: flex-start; }
.pillar li svg { flex: none; margin-top: 3px; color: var(--signal); }
.pillar li span { color: var(--muted); }
.pillar li b { color: var(--paper); font-weight: 600; }

/* =============================================================
   CAPABILITIES GRID
   ============================================================= */
.cap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: var(--radius-lg); overflow: hidden; }
.cap { background: var(--ink); padding: clamp(1.5rem, 2.5vw, 2.1rem); transition: background 0.35s var(--ease); position: relative; }
.cap:hover { background: var(--surface-2); }
.cap .cap-ix { font-family: var(--font-mono); font-size: 0.72rem; color: var(--faint); letter-spacing: 0.1em; }
.cap h3 { font-size: var(--step-1); margin-top: 0.9rem; display: flex; align-items: center; gap: 0.6rem; }
.cap h3 svg { color: var(--copper); flex: none; }
.cap p { margin-top: 0.7rem; color: var(--muted); font-size: var(--step--1); line-height: 1.55; }

/* =============================================================
   TUYA SPOTLIGHT
   ============================================================= */
.tuya { position: relative; }
.tuya-panel {
  position: relative; overflow: hidden;
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background:
    radial-gradient(700px 400px at 88% 12%, var(--glow-copper), transparent 60%),
    linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  padding: clamp(2rem, 5vw, 4rem);
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(2rem, 5vw, 4rem); align-items: center;
}
.tuya-panel h2 { font-size: var(--step-3); margin-top: 0.9rem; }
.tuya-panel p { margin-top: 1.2rem; color: var(--muted); font-size: var(--step-1); line-height: 1.5; }
.tuya-badges { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.8rem; }
.tuya-badges span { font-family: var(--font-mono); font-size: 0.78rem; padding: 0.5em 0.9em; border: 1px solid var(--line); border-radius: 8px; color: var(--paper); background: color-mix(in srgb, var(--ink) 40%, transparent); }
.tuya-badges span::before { content: "› "; color: var(--copper); }

/* Device-flow diagram */
.flow { display: grid; gap: 0; }
.flow-node { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.2rem; border: 1px solid var(--line); border-radius: var(--radius); background: color-mix(in srgb, var(--ink) 55%, transparent); position: relative; }
.flow-node .ic { width: 40px; height: 40px; flex: none; border-radius: 10px; display: grid; place-items: center; background: var(--surface-3); color: var(--signal); }
.flow-node .ft { display: block; font-family: var(--font-mono); font-size: 0.72rem; color: var(--faint); letter-spacing: 0.08em; text-transform: uppercase; }
.flow-node .fv { display: block; font-family: var(--font-display); font-weight: 700; font-size: 1.02rem; margin-top: 3px; }
.flow-connector { width: 1px; height: 26px; margin-left: calc(1.2rem + 20px); background: linear-gradient(var(--copper), var(--signal-dim)); position: relative; }
.flow-connector::after { content: ""; position: absolute; left: 50%; top: 0; transform: translateX(-50%); width: 5px; height: 5px; border-radius: 50%; background: var(--copper); animation: flowdot 2.2s var(--ease) infinite; }
@keyframes flowdot { 0% { top: 0; opacity: 0; } 20% { opacity: 1; } 80% { opacity: 1; } 100% { top: 100%; opacity: 0; } }
.flow-node.accent { border-color: color-mix(in srgb, var(--copper) 45%, var(--line)); background: color-mix(in srgb, var(--copper) 8%, var(--ink)); }
.flow-node.accent .ic { color: var(--copper); background: color-mix(in srgb, var(--copper) 16%, var(--surface-3)); }

/* =============================================================
   PROCESS  (a genuine sequence -> numbered)
   ============================================================= */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(1rem, 2.5vw, 1.8rem); counter-reset: step; }
.step { position: relative; padding-top: 2.2rem; border-top: 1px solid var(--line); }
.step::before { counter-increment: step; content: counter(step, decimal-leading-zero); position: absolute; top: -0.1rem; left: 0; font-family: var(--font-mono); font-size: 0.82rem; color: var(--copper); letter-spacing: 0.05em; }
.step::after { content: ""; position: absolute; top: -1px; left: 0; width: 34px; height: 2px; background: var(--copper); }
.step h3 { font-size: var(--step-1); margin-bottom: 0.7rem; }
.step p { color: var(--muted); font-size: var(--step--1); line-height: 1.55; }

/* =============================================================
   ABOUT
   ============================================================= */
.about-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.about-card { border: 1px solid var(--line); border-radius: var(--radius-lg); background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%); padding: clamp(1.6rem, 3vw, 2.4rem); }
.about-card .avatar { width: 64px; height: 64px; border-radius: 16px; background: linear-gradient(150deg, var(--copper), var(--copper-dim)); display: grid; place-items: center; font-family: var(--font-display); font-weight: 700; font-size: 1.6rem; color: #1A0E04; }
.about-card .who { margin-top: 1.2rem; }
.about-card .who .name { font-family: var(--font-display); font-weight: 700; font-size: 1.35rem; }
.about-card .who .role { font-family: var(--font-mono); font-size: var(--step--1); color: var(--copper); margin-top: 0.2rem; }
.about-card .who .bio { margin-top: 1rem; color: var(--muted); font-size: var(--step--1); line-height: 1.6; }
.about-card .who .bio + .bio { margin-top: 0.8rem; }
.about-card .avatar svg { width: 34px; height: 34px; }
.team-roles { list-style: none; margin: 1.3rem 0 0; padding: 0; display: grid; gap: 0.65rem; }
.team-roles li { display: flex; align-items: center; gap: 0.7rem; font-family: var(--font-mono); font-size: var(--step--1); color: var(--muted); }
.team-roles li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--copper); flex: none; }
.about-links { display: flex; gap: 0.8rem; margin-top: 1.5rem; flex-wrap: wrap; }
.about-links a { display: inline-flex; align-items: center; gap: 0.5em; font-family: var(--font-mono); font-size: var(--step--1); color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 0.5em 1em; transition: color 0.2s, border-color 0.2s; }
.about-links a:hover { color: var(--copper-hi); border-color: var(--copper); }
.about-copy h2 { margin-bottom: 1.4rem; }
.about-copy p { color: var(--muted); font-size: var(--step-1); line-height: 1.55; }
.about-copy p + p { margin-top: 1.2rem; }
.about-copy strong { color: var(--paper); font-weight: 600; }

/* =============================================================
   CONTACT
   ============================================================= */
.contact { position: relative; }
.contact-panel {
  border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden;
  background:
    radial-gradient(600px 400px at 15% 120%, var(--glow-signal), transparent 55%),
    radial-gradient(600px 400px at 90% -20%, var(--glow-copper), transparent 55%),
    linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  padding: clamp(2.5rem, 6vw, 5rem);
  text-align: center;
}
.contact-panel h2 { font-size: var(--step-3); max-width: 20ch; margin-inline: auto; }
.contact-panel p { margin: 1.3rem auto 0; color: var(--muted); font-size: var(--step-1); max-width: 52ch; line-height: 1.5; }
.contact-actions { margin-top: 2.4rem; display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.contact-mail { margin-top: 2rem; font-family: var(--font-mono); font-size: var(--step--1); color: var(--faint); }
.contact-mail a { color: var(--signal); }

/* =============================================================
   FOOTER
   ============================================================= */
.site-footer { border-top: 1px solid var(--line-soft); padding-block: clamp(3rem, 6vw, 4.5rem) 2.5rem; margin-top: clamp(2rem, 4vw, 3.25rem); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem; }
.footer-brand .brand { margin-bottom: 1.2rem; }
.footer-brand p { color: var(--muted); font-size: var(--step--1); max-width: 40ch; line-height: 1.6; }
.footer-col h4 { font-family: var(--font-mono); font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--faint); font-weight: 500; margin-bottom: 1.1rem; }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.7rem; }
.footer-col a { color: var(--muted); font-size: var(--step--1); transition: color 0.2s; }
.footer-col a:hover { color: var(--copper-hi); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-top: 3rem; padding-top: 1.8rem; border-top: 1px solid var(--line-soft); font-family: var(--font-mono); font-size: 0.74rem; color: var(--faint); flex-wrap: wrap; }
.footer-bottom .keywords { max-width: 60ch; line-height: 1.6; }

/* =============================================================
   Floating WhatsApp button
   ============================================================= */
.fab-wa {
  position: fixed; z-index: 90;
  right: clamp(1rem, 3vw, 2rem); bottom: clamp(1rem, 3vw, 2rem);
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.8rem 1.15rem; border-radius: 999px;
  background: color-mix(in srgb, var(--surface-3) 92%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--line); color: var(--paper);
  font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.01em;
  box-shadow: 0 18px 44px -20px rgba(0,0,0,0.9);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.fab-wa:hover { transform: translateY(-3px); border-color: var(--signal); background: var(--surface-3); }
.fab-wa:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }
.fab-wa svg { width: 22px; height: 22px; color: var(--signal); flex: none; }
@media (max-width: 560px) {
  .fab-wa { padding: 0.85rem; }
  .fab-wa .fab-txt { display: none; }
}

/* =============================================================
   Contact form modal
   ============================================================= */
.modal[hidden] { display: none; }
.modal { position: fixed; inset: 0; z-index: 200; display: grid; place-items: center; padding: 1.2rem; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(6,10,9,0.74); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
.modal-panel {
  position: relative; width: min(100%, 540px); max-height: 92vh; overflow-y: auto;
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  padding: clamp(1.6rem, 4vw, 2.6rem);
  box-shadow: 0 40px 100px -40px rgba(0,0,0,0.9);
  animation: modalIn 0.35s var(--ease);
}
@keyframes modalIn { from { opacity: 0; transform: translateY(16px) scale(0.98); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .modal-panel { animation: none; } }
.modal-panel h2 { font-size: var(--step-2); margin-top: 0.7rem; }
.modal-sub { margin-top: 0.8rem; color: var(--muted); font-size: var(--step--1); line-height: 1.5; }
.modal-sub a { color: var(--signal); }
.modal-close { position: absolute; top: 0.9rem; right: 0.9rem; width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface-3); color: var(--paper); font-size: 1.25rem; line-height: 1; display: grid; place-items: center; transition: border-color 0.2s, color 0.2s; }
.modal-close:hover { border-color: var(--copper); color: var(--copper-hi); }
.modal-close:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }
#contactForm { margin-top: 1.6rem; display: grid; gap: 1.05rem; }
.field { display: grid; gap: 0.45rem; }
.field label { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--muted); text-transform: uppercase; }
.field .opt { color: var(--faint); text-transform: none; letter-spacing: 0; }
.field input, .field textarea {
  width: 100%; background: var(--ink); border: 1px solid var(--line); border-radius: var(--radius-sm);
  color: var(--paper); font-family: var(--font-body); font-size: var(--step-0);
  padding: 0.8rem 0.9rem; transition: border-color 0.2s; resize: vertical;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--copper); }
.field input:user-invalid, .field textarea:user-invalid { border-color: #C6564A; }
#contactForm .btn-primary { justify-content: center; margin-top: 0.3rem; }
#contactForm .btn-primary[disabled] { opacity: 0.6; pointer-events: none; }
.form-status { font-family: var(--font-mono); font-size: 0.8rem; min-height: 1.2em; margin: 0; }
.form-status.ok { color: var(--signal); }
.form-status.err { color: #E68A7E; }
body.modal-open { overflow: hidden; }

/* =============================================================
   Scroll reveal
   ============================================================= */
[data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
[data-reveal].in { opacity: 1; transform: none; }
[data-reveal][data-delay="1"] { transition-delay: 0.08s; }
[data-reveal][data-delay="2"] { transition-delay: 0.16s; }
[data-reveal][data-delay="3"] { transition-delay: 0.24s; }
@media (prefers-reduced-motion: reduce) { [data-reveal] { opacity: 1; transform: none; } }

/* =============================================================
   RESPONSIVE
   ============================================================= */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; }
  .readout { max-width: 460px; }
  .tuya-panel { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .cap-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .site-header.menu-open .nav-toggle span:nth-child(1) { transform: translateY(6.6px) rotate(45deg); }
  .site-header.menu-open .nav-toggle span:nth-child(2) { opacity: 0; }
  .site-header.menu-open .nav-toggle span:nth-child(3) { transform: translateY(-6.6px) rotate(-45deg); }
  .mobile-menu { position: fixed; inset: 74px 0 auto 0; z-index: 99; background: color-mix(in srgb, var(--ink) 96%, transparent); backdrop-filter: blur(16px); border-bottom: 1px solid var(--line); padding: 1.5rem var(--gutter) 2rem; transform: translateY(-120%); transition: transform 0.4s var(--ease); }
  .site-header.menu-open .mobile-menu { transform: translateY(0); }
  .mobile-menu ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; }
  .mobile-menu a { display: block; padding: 0.9rem 0; font-family: var(--font-mono); font-size: 1rem; color: var(--paper); border-bottom: 1px solid var(--line-soft); }
  .mobile-menu .btn { margin-top: 1.2rem; width: 100%; justify-content: center; }
  .pillars { grid-template-columns: 1fr; }
  .cap-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}
@media (min-width: 721px) { .mobile-menu { display: none; } }
@media (max-width: 460px) {
  .steps { grid-template-columns: 1fr; }
  .hero-actions .btn, .contact-actions .btn { width: 100%; justify-content: center; }
}