/*
Theme Name: Nano Green
Theme URI: https://nanogreen.pt
Author: Nano Green
Author URI: https://nanogreen.pt
Description: Tema WordPress à medida para a NANO GREEN, subsidiária industrial da NANOCAV TECH GROUP — produção de AdBlue® / AUS 32 / AUS 40 em Setúbal.
Version: 1.0.0
Requires at least: 6.0
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: nano-green
*/

/* -------------------------------------------------------
   0. Custom properties
------------------------------------------------------- */
:root{
  --c-blue-900:#06264a;
  --c-blue-800:#0a3a6e;
  --c-blue-700:#0b4f9e;
  --c-blue-600:#1360b8;
  --c-blue-500:#1671c9;
  --c-blue-100:#e6f0fa;

  --c-green-700:#256b23;
  --c-green-600:#2f8f2c;
  --c-green-500:#43a336;
  --c-green-400:#6cbf3f;
  --c-green-100:#e9f6e4;

  --c-ink:#0f2029;
  --c-slate:#51616c;
  --c-slate-light:#7c8b93;
  --c-bg:#ffffff;
  --c-bg-soft:#f3f7f6;
  --c-bg-deep:#081c30;
  --c-line:#e2e9e7;

  --grad-brand: linear-gradient(120deg, var(--c-blue-700) 0%, var(--c-blue-600) 45%, var(--c-green-500) 100%);
  --grad-hero: linear-gradient(115deg, rgba(6,26,48,.94) 0%, rgba(8,44,84,.86) 42%, rgba(15,70,55,.55) 100%);

  --shadow-sm: 0 2px 10px rgba(10,30,50,.06);
  --shadow-md: 0 10px 30px rgba(10,30,50,.10);
  --shadow-lg: 0 24px 60px rgba(6,20,40,.18);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 26px;

  --font-head: 'Poppins', 'Segoe UI', Arial, sans-serif;
  --font-body: 'Inter', 'Segoe UI', Arial, sans-serif;

  --container: 1200px;
}

/* -------------------------------------------------------
   1. Reset & base
------------------------------------------------------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--c-ink);
  background:var(--c-bg);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4{ font-family:var(--font-head); color:var(--c-blue-900); line-height:1.18; margin:0 0 .6em; font-weight:700; }
p{ margin:0 0 1em; }
button{ font-family:inherit; }

.container{ max-width:var(--container); margin:0 auto; padding:0 24px; }

.section{ padding:110px 0; position:relative; }
.section--soft{ background:var(--c-bg-soft); }
.section--deep{ background:var(--c-bg-deep); color:#dce8ef; }
.section--deep h2, .section--deep h3{ color:#fff; }

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-head);
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--c-green-600);
  background:var(--c-green-100);
  padding:8px 16px 8px 12px;
  border-radius:999px;
  margin-bottom:22px;
}
.eyebrow::before{ content:""; width:7px; height:7px; border-radius:50%; background:var(--c-green-500); flex:none; }
.section--deep .eyebrow{ background:rgba(108,191,63,.16); color:#a9e08a; }

.section-head{ max-width:720px; margin-bottom:56px; }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }
h2.h-lg{ font-size:clamp(28px,4vw,42px); }
.section-head p{ color:var(--c-slate); font-size:17px; max-width:640px; }
.section--deep .section-head p{ color:#b7c9d3; }
.section-head.center p{ margin-left:auto; margin-right:auto; }

.eyebrow-line{ font-size:13px; letter-spacing:.06em; color:var(--c-slate-light); text-transform:uppercase; font-weight:600; }

/* -------------------------------------------------------
   2. Buttons
------------------------------------------------------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  font-family:var(--font-head); font-weight:600; font-size:15px;
  padding:15px 28px; border-radius:999px; border:2px solid transparent;
  cursor:pointer; transition:transform .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease;
  white-space:nowrap;
}
.btn--primary{ background:var(--grad-brand); color:#fff; box-shadow:0 12px 26px rgba(11,79,158,.35); }
.btn--primary:hover{ transform:translateY(-2px); box-shadow:0 16px 34px rgba(11,79,158,.42); }
.btn--ghost{ background:rgba(255,255,255,.08); border-color:rgba(255,255,255,.55); color:#fff; }
.btn--ghost:hover{ background:rgba(255,255,255,.16); transform:translateY(-2px); }
.btn--outline{ background:transparent; border-color:var(--c-blue-700); color:var(--c-blue-700); }
.btn--outline:hover{ background:var(--c-blue-700); color:#fff; transform:translateY(-2px); }
.btn--sm{ padding:11px 20px; font-size:13.5px; }

/* -------------------------------------------------------
   3. Header / nav
------------------------------------------------------- */
.site-header{
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  padding:18px 0;
  transition:background .35s ease, box-shadow .35s ease, padding .35s ease;
}
.site-header .container{ display:flex; align-items:center; justify-content:space-between; gap:24px; }
.site-header.is-scrolled{ background:rgba(255,255,255,.97); box-shadow:0 4px 24px rgba(10,30,50,.08); padding:10px 0; backdrop-filter:blur(6px); }

.brand{ display:flex; align-items:center; gap:10px; }
.brand img{ height:40px; width:auto; transition:filter .3s ease; }
.site-header:not(.is-scrolled) .brand img{ filter:brightness(0) invert(1); }

.nav-toggle{
  display:none; flex-direction:column; gap:5px; background:none; border:0; cursor:pointer; padding:8px; z-index:1100;
}
.nav-toggle span{ width:26px; height:2px; background:#fff; border-radius:2px; transition:transform .3s ease, opacity .3s ease, background .3s ease; }
.site-header.is-scrolled .nav-toggle span{ background:var(--c-blue-900); }

.main-nav ul{ display:flex; align-items:center; gap:6px; }
.main-nav a{
  font-family:var(--font-head); font-size:14px; font-weight:500; color:#fff;
  padding:9px 15px; border-radius:999px; transition:background .25s ease,color .25s ease;
}
.site-header.is-scrolled .main-nav a{ color:var(--c-blue-900); }
.main-nav a:hover, .main-nav a.is-active{ background:rgba(255,255,255,.16); }
.site-header.is-scrolled .main-nav a:hover, .site-header.is-scrolled .main-nav a.is-active{ background:var(--c-green-100); color:var(--c-green-700); }

.header-actions{ display:flex; align-items:center; gap:14px; }

@media (max-width: 980px){
  .nav-toggle{ display:flex; }
  .main-nav{
    position:fixed; inset:0 0 0 auto; width:min(320px,86vw); height:100vh;
    background:var(--c-blue-900); padding:100px 32px 40px; transform:translateX(100%);
    transition:transform .4s ease; box-shadow:-20px 0 50px rgba(0,0,0,.25);
  }
  .main-nav.is-open{ transform:translateX(0); }
  .main-nav ul{ flex-direction:column; align-items:flex-start; gap:4px; width:100%; }
  .main-nav a{ display:block; width:100%; color:#fff; padding:13px 16px; font-size:16px; }
  .main-nav a:hover, .main-nav a.is-active{ background:rgba(255,255,255,.1); }
  .header-actions .btn span.btn-text-full{ display:none; }
  .nav-scrim{ position:fixed; inset:0; background:rgba(4,12,22,.5); opacity:0; pointer-events:none; transition:opacity .35s ease; z-index:1050; }
  .nav-scrim.is-open{ opacity:1; pointer-events:auto; }
}

/* -------------------------------------------------------
   4. Hero
------------------------------------------------------- */
.hero{
  position:relative; min-height:100vh; display:flex; align-items:center;
  background:url('assets/images/hero-fleet.jpg') center/cover no-repeat;
  padding:170px 0 110px;
}
.hero::before{ content:""; position:absolute; inset:0; background:var(--grad-hero); }
.hero .container{ position:relative; z-index:2; }
.hero-inner{ max-width:700px; }
.hero .eyebrow{ background:rgba(108,191,63,.18); color:#b7ea94; }
.hero h1{
  color:#fff; font-size:clamp(34px,5.4vw,58px); letter-spacing:-.01em; margin-bottom:.4em;
}
.hero h1 em{ font-style:normal; color:var(--c-green-400); }
.hero-lead{ color:#e4edf1; font-size:18px; max-width:560px; margin-bottom:34px; }
.hero-actions{ display:flex; flex-wrap:wrap; gap:16px; margin-bottom:56px; }

.hero-quote{
  border-left:3px solid var(--c-green-500);
  padding:4px 0 4px 22px; max-width:520px; color:#dfeaf0; font-style:italic; font-size:16.5px;
}

.hero-stats{ display:flex; gap:40px; margin-top:56px; flex-wrap:wrap; }
.hero-stats div strong{ display:block; font-family:var(--font-head); font-size:30px; color:#fff; }
.hero-stats div span{ font-size:13px; color:#b9c9d1; text-transform:uppercase; letter-spacing:.06em; }

.scroll-cue{
  position:absolute; bottom:34px; left:50%; transform:translateX(-50%); z-index:2;
  color:#cfe0e7; font-size:12px; letter-spacing:.12em; text-transform:uppercase;
  display:flex; flex-direction:column; align-items:center; gap:8px;
}
.scroll-cue .dot{ width:1px; height:34px; background:linear-gradient(#fff,transparent); animation:scrollcue 1.8s infinite; }
@keyframes scrollcue{ 0%{ opacity:0; transform:translateY(-6px);} 40%{opacity:1;} 100%{ opacity:0; transform:translateY(10px);} }

/* -------------------------------------------------------
   5. About / intro strip
------------------------------------------------------- */
.about{ padding-top:120px; }
.about-grid{ display:grid; grid-template-columns:1.05fr .95fr; gap:70px; align-items:center; }
.about-copy p{ color:var(--c-slate); font-size:17px; }
.about-quote{
  background:var(--grad-brand); color:#fff; padding:34px 36px; border-radius:var(--radius-md);
  font-family:var(--font-head); font-size:19px; font-weight:500; line-height:1.5; box-shadow:var(--shadow-md);
  margin-top:28px;
}
.about-media{ position:relative; }
.about-media img{ border-radius:var(--radius-lg); box-shadow:var(--shadow-lg); }
.about-badge{
  position:absolute; bottom:-28px; left:-28px; background:#fff; border-radius:var(--radius-md);
  box-shadow:var(--shadow-md); padding:20px 24px; display:flex; align-items:center; gap:14px; max-width:280px;
}
.about-badge .ico{ width:44px; height:44px; border-radius:50%; background:var(--c-green-100); display:flex; align-items:center; justify-content:center; flex:none; }
.about-badge strong{ display:block; font-family:var(--font-head); font-size:15px; color:var(--c-blue-900); }
.about-badge span{ font-size:12.5px; color:var(--c-slate); }

@media (max-width: 900px){
  .about-grid{ grid-template-columns:1fr; gap:60px; }
  .about-badge{ position:static; margin-top:20px; max-width:none; }
}

/* -------------------------------------------------------
   6. Cards / grids (generic)
------------------------------------------------------- */
.grid{ display:grid; gap:26px; }
.grid--2{ grid-template-columns:repeat(2,1fr); }
.grid--3{ grid-template-columns:repeat(3,1fr); }
.grid--4{ grid-template-columns:repeat(4,1fr); }
.grid--6{ grid-template-columns:repeat(6,1fr); }

@media (max-width: 980px){
  .grid--3, .grid--4{ grid-template-columns:repeat(2,1fr); }
  .grid--6{ grid-template-columns:repeat(3,1fr); }
}
@media (max-width: 620px){
  .grid--2, .grid--3, .grid--4{ grid-template-columns:1fr; }
  .grid--6{ grid-template-columns:repeat(2,1fr); }
}

.card{
  background:#fff; border:1px solid var(--c-line); border-radius:var(--radius-md);
  padding:32px 28px; box-shadow:var(--shadow-sm); transition:transform .3s ease, box-shadow .3s ease;
}
.card:hover{ transform:translateY(-6px); box-shadow:var(--shadow-md); }
.card .ico{
  width:52px; height:52px; border-radius:14px; display:flex; align-items:center; justify-content:center;
  background:var(--c-blue-100); color:var(--c-blue-700); margin-bottom:20px; flex:none;
}
.card .ico svg{ width:24px; height:24px; }
.card h3{ font-size:19px; margin-bottom:.5em; }
.card p{ color:var(--c-slate); font-size:15px; margin-bottom:0; }
.card.is-green .ico{ background:var(--c-green-100); color:var(--c-green-600); }

.num-card{ position:relative; padding-top:44px; }
.num-card .num{
  position:absolute; top:-18px; left:28px; width:46px; height:46px; border-radius:50%;
  background:var(--grad-brand); color:#fff; display:flex; align-items:center; justify-content:center;
  font-family:var(--font-head); font-weight:700; font-size:16px; box-shadow:0 8px 18px rgba(11,79,158,.35);
}

/* -------------------------------------------------------
   7. Produto (o que é AdBlue)
------------------------------------------------------- */
.split{ display:grid; grid-template-columns:1fr 1fr; gap:70px; align-items:start; }
@media (max-width: 900px){ .split{ grid-template-columns:1fr; gap:44px; } }
.split .copy p{ color:var(--c-slate); font-size:16.5px; }
.split .copy p strong{ color:var(--c-blue-900); }

/* -------------------------------------------------------
   8. Product lines (3 linhas)
------------------------------------------------------- */
.line-card{
  background:#fff; border-radius:var(--radius-lg); box-shadow:var(--shadow-sm); border:1px solid var(--c-line);
  padding:38px 34px; position:relative; overflow:hidden; height:100%;
}
.line-card::before{ content:""; position:absolute; top:0; left:0; width:100%; height:100%; opacity:.035; background:var(--grad-brand); pointer-events:none; }
.line-card .tag{
  display:inline-block; font-size:11.5px; font-weight:700; letter-spacing:.08em; text-transform:uppercase;
  color:var(--c-blue-700); background:var(--c-blue-100); padding:5px 12px; border-radius:999px; margin-bottom:18px;
}
.line-card h3{ font-size:21px; margin-bottom:.4em; }
.line-card p{ color:var(--c-slate); font-size:15px; }
.line-card.is-marine .tag{ color:var(--c-green-700); background:var(--c-green-100); }

.legal-note{
  margin-top:34px; font-size:13.5px; color:var(--c-slate-light); border-top:1px solid var(--c-line); padding-top:22px;
}

/* -------------------------------------------------------
   9. Tecnologia
------------------------------------------------------- */
.tech-media{ position:relative; border-radius:var(--radius-lg); overflow:hidden; box-shadow:var(--shadow-lg); }
.tech-media img{ width:100%; }
.tech-bullets li{
  display:flex; gap:14px; padding:14px 0; border-bottom:1px solid var(--c-line); color:var(--c-slate); font-size:15.5px;
}
.tech-bullets li:last-child{ border-bottom:0; }
.tech-bullets li svg{ flex:none; width:20px; height:20px; color:var(--c-green-600); margin-top:2px; }

.compare{ margin-top:80px; }
.compare-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
@media (max-width: 900px){ .compare-grid{ grid-template-columns:1fr; } }
.compare-card{ border-radius:var(--radius-md); padding:30px 28px; }
.compare-card h4{ font-family:var(--font-head); font-size:13px; letter-spacing:.08em; text-transform:uppercase; margin-bottom:16px; }
.compare-card ul li{ position:relative; padding-left:18px; margin-bottom:10px; font-size:14.5px; line-height:1.5; }
.compare-card ul li::before{ content:"—"; position:absolute; left:0; opacity:.5; }
.compare-card.is-old{ background:var(--c-bg-soft); border:1px solid var(--c-line); color:var(--c-slate); }
.compare-card.is-old h4{ color:var(--c-slate-light); }
.compare-card.is-tech{ background:var(--c-blue-900); color:#dbe8ef; }
.compare-card.is-tech h4{ color:#9ec9ec; }
.compare-card.is-result{ background:var(--grad-brand); color:#fff; }
.compare-card.is-result h4{ color:#d8f4c9; }
.compare-card.is-result ul li::before{ opacity:.8; }

/* -------------------------------------------------------
   10. Sustentabilidade
------------------------------------------------------- */
.sustain-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:26px; }
@media (max-width: 980px){ .sustain-grid{ grid-template-columns:repeat(2,1fr); } }
@media (max-width: 620px){ .sustain-grid{ grid-template-columns:1fr; } }

/* -------------------------------------------------------
   11. Certificação
------------------------------------------------------- */
.cert-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
@media (max-width: 980px){ .cert-grid{ grid-template-columns:repeat(2,1fr); } }
@media (max-width: 560px){ .cert-grid{ grid-template-columns:1fr; } }
.cert-card{
  text-align:center; background:#fff; border:1px solid var(--c-line); border-radius:var(--radius-md);
  padding:30px 20px; box-shadow:var(--shadow-sm); transition:transform .3s ease, box-shadow .3s ease;
}
.cert-card:hover{ transform:translateY(-6px); box-shadow:var(--shadow-md); }
.cert-card .ico{
  width:58px; height:58px; border-radius:50%; margin:0 auto 16px; display:flex; align-items:center; justify-content:center;
  background:var(--grad-brand); color:#fff;
}
.cert-card .ico svg{ width:26px; height:26px; }
.cert-card h4{ font-family:var(--font-head); font-size:15px; color:var(--c-blue-900); margin-bottom:.4em; }
.cert-card p{ font-size:13px; color:var(--c-slate); margin:0; }

/* -------------------------------------------------------
   12. Serviço B2B
------------------------------------------------------- */
.sector-strip{ display:grid; grid-template-columns:repeat(6,1fr); gap:16px; margin:44px 0 54px; }
@media (max-width: 980px){ .sector-strip{ grid-template-columns:repeat(3,1fr); } }
@media (max-width: 560px){ .sector-strip{ grid-template-columns:repeat(2,1fr); } }
.sector-chip{
  background:#fff; border:1px solid var(--c-line); border-radius:var(--radius-md); padding:26px 14px;
  text-align:center; box-shadow:var(--shadow-sm); transition:transform .3s ease,box-shadow .3s ease,background .3s ease;
}
.sector-chip:hover{ transform:translateY(-5px); box-shadow:var(--shadow-md); background:var(--c-green-100); }
.sector-chip .ico{ width:44px; height:44px; margin:0 auto 12px; border-radius:12px; background:var(--c-blue-100); color:var(--c-blue-700); display:flex; align-items:center; justify-content:center; }
.sector-chip span{ font-family:var(--font-head); font-size:13.5px; font-weight:600; color:var(--c-blue-900); }

.b2b-model{
  display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center; background:#fff; border-radius:var(--radius-lg);
  box-shadow:var(--shadow-md); border:1px solid var(--c-line); padding:50px; overflow:hidden;
}
@media (max-width: 900px){ .b2b-model{ grid-template-columns:1fr; padding:34px; gap:30px; } }
.b2b-model img{ border-radius:var(--radius-md); }
.b2b-model .copy p{ color:var(--c-slate); font-size:16px; }

/* -------------------------------------------------------
   13. Marítima (full bleed)
------------------------------------------------------- */
.marine{
  position:relative; min-height:640px; display:flex; align-items:center;
  background:url('assets/images/marine-ship.jpg') center/cover no-repeat;
}
.marine::before{ content:""; position:absolute; inset:0; background:linear-gradient(100deg, rgba(6,26,48,.92) 0%, rgba(8,44,84,.72) 46%, rgba(8,44,84,.15) 100%); }
.marine .container{ position:relative; z-index:2; }
.marine-inner{ max-width:560px; color:#fff; }
.marine-inner p{ color:#dbe8ef; font-size:17px; }
.marine .eyebrow{ background:rgba(108,191,63,.18); color:#b7ea94; }

/* -------------------------------------------------------
   14. Contacto
------------------------------------------------------- */
.contact-grid{ display:grid; grid-template-columns:.9fr 1.1fr; gap:70px; }
@media (max-width: 900px){ .contact-grid{ grid-template-columns:1fr; gap:50px; } }
.contact-list{ margin-top:30px; }
.contact-list li{
  display:flex; align-items:center; gap:16px; padding:18px 0; border-bottom:1px solid rgba(255,255,255,.12);
}
.contact-list li .ico{
  width:46px; height:46px; border-radius:12px; background:rgba(108,191,63,.16); color:var(--c-green-400);
  display:flex; align-items:center; justify-content:center; flex:none;
}
.contact-list li strong{ display:block; font-family:var(--font-head); font-size:15.5px; color:#fff; }
.contact-list li span{ font-size:13.5px; color:#a9bcc5; }

.contact-form{ background:#fff; border-radius:var(--radius-lg); padding:44px; box-shadow:var(--shadow-lg); }
.contact-form h3{ color:var(--c-blue-900); }
.form-row{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
@media (max-width: 560px){ .form-row{ grid-template-columns:1fr; } }
.contact-form label{ display:block; font-size:13px; font-weight:600; color:var(--c-slate); margin-bottom:7px; }
.contact-form input, .contact-form textarea, .contact-form select{
  width:100%; border:1px solid var(--c-line); border-radius:10px; padding:13px 14px; font-family:var(--font-body);
  font-size:14.5px; color:var(--c-ink); margin-bottom:18px; background:var(--c-bg-soft); transition:border-color .2s ease, background .2s ease;
}
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus{ outline:none; border-color:var(--c-blue-500); background:#fff; }
.contact-form textarea{ resize:vertical; min-height:120px; }
.contact-form .btn{ width:100%; }
.form-note{ font-size:12px; color:var(--c-slate-light); margin-top:12px; text-align:center; }

.legal-strip{ font-size:13px; color:#93a8b2; max-width:760px; margin-top:50px; padding-top:26px; border-top:1px solid rgba(255,255,255,.12); }

/* -------------------------------------------------------
   15. Footer
------------------------------------------------------- */
.site-footer{ background:#04121f; color:#93a8b2; padding:70px 0 26px; }
.footer-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:50px; margin-bottom:50px; }
@media (max-width: 900px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width: 560px){ .footer-grid{ grid-template-columns:1fr; } }
.footer-brand img{ height:34px; margin-bottom:16px; filter:brightness(0) invert(1); }
.footer-brand p{ font-size:14px; max-width:280px; }
.footer-col h5{ font-family:var(--font-head); color:#fff; font-size:14px; margin-bottom:18px; letter-spacing:.03em; }
.footer-col ul li{ margin-bottom:11px; }
.footer-col a{ font-size:14px; color:#93a8b2; transition:color .2s ease; }
.footer-col a:hover{ color:#fff; }
.footer-bottom{
  display:flex; justify-content:space-between; align-items:center; gap:20px; flex-wrap:wrap;
  padding-top:26px; border-top:1px solid rgba(255,255,255,.08); font-size:12.5px; color:#5f7683;
}

/* -------------------------------------------------------
   16. Reveal-on-scroll
------------------------------------------------------- */
.reveal{ opacity:0; transform:translateY(26px); transition:opacity .7s ease, transform .7s ease; }
.reveal.is-visible{ opacity:1; transform:none; }

/* -------------------------------------------------------
   17. Back to top
------------------------------------------------------- */
.to-top{
  position:fixed; right:24px; bottom:24px; width:48px; height:48px; border-radius:50%; z-index:900;
  background:var(--grad-brand); color:#fff; display:flex; align-items:center; justify-content:center;
  box-shadow:var(--shadow-md); opacity:0; pointer-events:none; transform:translateY(10px);
  transition:opacity .3s ease, transform .3s ease; border:0; cursor:pointer;
}
.to-top.is-visible{ opacity:1; pointer-events:auto; transform:none; }

/* -------------------------------------------------------
   18. Misc responsive section spacing
------------------------------------------------------- */
@media (max-width: 700px){
  .section{ padding:76px 0; }
  .hero{ padding:150px 0 90px; text-align:left; }
  .about{ padding-top:76px; }
  .contact-form{ padding:30px; }
}