/* ============================================================
   TETRA ENERGY — shared design tokens & components
   Brand: reliability · solidity · innovation (B2B energy trading)
   Palette: monochrome base + signature orange→red energy accent
   ============================================================ */

:root {
  /* ink / paper */
  --ink:      #0B0B0C;
  --ink-2:    #2B2B2E;
  --ink-3:    #55555A;
  --paper:    #FFFFFF;
  --paper-2:  #F5F4F1;   /* warm off-white */
  --paper-3:  #EBE8E3;
  --gray:     #908D89;   /* desaturated brand mauve */
  --line:     rgba(11,11,12,0.12);
  --line-2:   rgba(11,11,12,0.07);

  /* signature accent (brand orange → red) */
  --accent:   #E84621;
  --accent-2: #C21A26;
  --grad:     linear-gradient(125deg, #E84621 0%, #C21A26 100%);

  --font-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-text:    "Hanken Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  --maxw: 1200px;
  --pad:  clamp(20px, 5vw, 64px);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-text);
  color: var(--ink);
  background: var(--paper);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ---- type helpers ---- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-2);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--accent);
}
.eyebrow.plain::before { display: none; }

h1, h2, h3 { font-family: var(--font-display); font-weight: 700; letter-spacing: -0.02em; line-height: 1.04; margin: 0; }
.display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 0.98;
}
.lead { font-size: clamp(19px, 2vw, 23px); line-height: 1.5; color: var(--ink-2); }
.muted { color: var(--ink-3); }
.mono-label { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--gray); }

/* ---- buttons ---- */
.btn {
  font-family: var(--font-text);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.01em;
  padding: 14px 24px;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn .arr { transition: transform .2s ease; }
.btn:hover .arr { transform: translateX(3px); }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent-2); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { filter: brightness(1.05); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-ghost-light { background: transparent; color: var(--paper); border-color: rgba(255,255,255,0.28); }
.btn-ghost-light:hover { border-color: #fff; }

/* ---- image placeholder ---- */
.ph {
  position: relative;
  background-color: var(--paper-3);
  background-image: repeating-linear-gradient(45deg,
      rgba(11,11,12,0.045) 0 11px, rgba(11,11,12,0) 11px 22px);
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  overflow: hidden;
}
.ph::after {
  content: attr(data-label);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray);
  background: var(--paper-2);
  padding: 6px 10px;
  margin: 14px;
  border: 1px solid var(--line-2);
}
.ph.dark {
  background-color: #161618;
  background-image: repeating-linear-gradient(45deg,
      rgba(255,255,255,0.05) 0 11px, rgba(255,255,255,0) 11px 22px);
}
.ph.dark::after { color: rgba(255,255,255,0.6); background: #0f0f10; border-color: rgba(255,255,255,0.1); }

/* ---- logo (real Tetra Energy mark; picks light/dark art via .light) ---- */
.logo {
  display: block;
  width: 104px; height: 48px;
  background-image: url("logo-tetra-light.png");
  background-repeat: no-repeat;
  background-position: left center;
  background-size: contain;
  flex: 0 0 auto;
}
.logo.light { background-image: url("logo-tetra-dark.png"); }
.logo > * { display: none; }
.footer .logo { width: 128px; height: 58px; }

/* ---- top nav (shared base) ---- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
  padding: 18px var(--pad);
  background: rgba(255,255,255,0.82);
  backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line-2);
}
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a {
  font-size: 14.5px; font-weight: 500; color: var(--ink-2);
  position: relative; transition: color .18s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); }
.nav-right { display: flex; align-items: center; gap: 16px; }
.nav-burger { display: none; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav-burger span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 4px 0; }
.nav.light { background: rgba(11,11,12,0.6); border-color: rgba(255,255,255,0.1); }
.nav.light .nav-links a { color: rgba(255,255,255,0.78); }
.nav.light .nav-links a:hover { color: #fff; }

/* ---- footer (shared) ---- */
.footer { background: var(--ink); color: rgba(255,255,255,0.7); padding: 72px var(--pad) 40px; }
.footer-grid { max-width: var(--maxw); margin: 0 auto; display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; }
.footer h4 { font-family: var(--font-mono); font-size: 11px; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: var(--gray); margin: 0 0 18px; }
.footer ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 11px; }
.footer ul a { font-size: 15px; color: rgba(255,255,255,0.72); transition: color .15s; }
.footer ul a:hover { color: #fff; }
.footer-intro { max-width: 300px; font-size: 14.5px; color: rgba(255,255,255,0.55); margin: 18px 0 0; line-height: 1.6; }
.footer-bottom {
  max-width: var(--maxw); margin: 56px auto 0; padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.12);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.04em; color: var(--gray);
}

@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px 24px; }
}
@media (max-width: 760px) {
  body { font-size: 16px; }
  .nav-links { display: none; }
  .nav-burger { display: block; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   SITE CHROME — client-area nav link · footer regulators · WhatsApp FAB
   ============================================================ */

/* ---- client-area nav link ---- */
.nav-client {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 500; color: var(--ink-2);
  padding: 8px 12px; border: 1px solid var(--line); border-radius: 2px;
  transition: color .18s ease, border-color .18s ease;
}
.nav-client svg { width: 18px; height: 18px; flex: 0 0 auto; }
.nav-client:hover { color: var(--ink); border-color: var(--ink); }
.nav.light .nav-client { color: rgba(255,255,255,0.82); border-color: rgba(255,255,255,0.24); }
.nav.light .nav-client:hover { color: #fff; border-color: #fff; }

/* ---- footer regulators + import/export authorisation ---- */
.footer-reg {
  max-width: var(--maxw); margin: 50px auto 0; padding-top: 38px;
  border-top: 1px solid rgba(255,255,255,0.12);
  display: grid; grid-template-columns: 1fr auto; gap: 36px; align-items: center;
}
.footer-reg .reg-auth .k {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent);
}
.footer-reg .reg-auth p {
  margin: 11px 0 0; font-size: 15.5px; line-height: 1.55;
  color: rgba(255,255,255,0.72); max-width: 48ch;
}
.footer-reg .reg-auth p b { color: #fff; font-weight: 600; }
.reg-marks { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.reg-badge {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  min-width: 104px; height: 60px; padding: 0 16px;
  border: 1px solid rgba(255,255,255,0.16); border-radius: 4px;
  background: #fff;
}
.reg-badge.logo img { height: 30px; width: auto; max-width: 120px; display: block; }
.reg-badge .ac {
  font-family: var(--font-display); font-weight: 700; font-size: 18px;
  letter-spacing: 0.04em; color: #0B0B0C; line-height: 1;
}
.reg-badge .ds {
  font-family: var(--font-mono); font-size: 8px; letter-spacing: 0.05em;
  text-transform: uppercase; color: #55555A; text-align: center; line-height: 1.15;
}
.footer-reg + .footer-bottom { margin-top: 30px; padding-top: 22px; }

/* ---- WhatsApp floating button ---- */
.wa-fab {
  position: fixed; right: clamp(16px, 3vw, 28px); bottom: clamp(16px, 3vw, 28px);
  z-index: 90;
}
.wa-fab a {
  position: relative; display: flex; align-items: center; justify-content: center;
  width: 60px; height: 60px; border-radius: 50%;
  background: #25D366; color: #fff;
  box-shadow: 0 10px 28px rgba(0,0,0,0.30);
  transition: transform .18s ease, box-shadow .18s ease;
}
.wa-fab a::before {
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(37,211,102,0.5); animation: wapulse 2.6s infinite;
}
@keyframes wapulse {
  0% { box-shadow: 0 0 0 0 rgba(37,211,102,0.45); }
  70% { box-shadow: 0 0 0 16px rgba(37,211,102,0); }
  100% { box-shadow: 0 0 0 0 rgba(37,211,102,0); }
}
.wa-fab a:hover { transform: translateY(-3px) scale(1.04); box-shadow: 0 14px 34px rgba(0,0,0,0.36); }
.wa-fab svg { width: 32px; height: 32px; position: relative; z-index: 1; }
.wa-fab .wa-tip {
  position: absolute; right: 72px; top: 50%; transform: translateY(-50%) translateX(6px);
  background: var(--ink); color: #fff; font-family: var(--font-text); font-weight: 600;
  font-size: 13.5px; white-space: nowrap; padding: 9px 14px; border-radius: 4px;
  opacity: 0; pointer-events: none; transition: opacity .18s ease, transform .18s ease;
  box-shadow: 0 8px 20px rgba(0,0,0,0.25);
}
.wa-fab .wa-tip::after {
  content: ""; position: absolute; right: -5px; top: 50%; transform: translateY(-50%) rotate(45deg);
  width: 10px; height: 10px; background: var(--ink);
}
.wa-fab a:hover .wa-tip { opacity: 1; transform: translateY(-50%) translateX(0); }
@media (max-width: 760px) {
  .nav-client span { display: none; }
  .nav-client { padding: 9px; }
  .footer-reg { grid-template-columns: 1fr; gap: 24px; }
  .wa-fab a { width: 54px; height: 54px; }
  .wa-fab svg { width: 28px; height: 28px; }
  .wa-fab .wa-tip { display: none; }
}
@media print { .wa-fab { display: none !important; } }

/* ---- nav dropdown (Soluções) ---- */
.nav-dd { position: relative; display: inline-flex; align-items: center; }
.nav-dd-trigger { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.dd-caret { font-size: 9px; opacity: 0.7; transition: transform .2s ease; }
.nav-dd:hover .dd-caret, .nav-dd:focus-within .dd-caret { transform: rotate(180deg); }
.nav-dd::after { content: ""; position: absolute; top: 100%; left: 0; right: 0; height: 16px; }
.nav-dd-menu {
  position: absolute; top: calc(100% + 14px); left: -14px; min-width: 256px;
  background: rgba(18,18,20,0.98); backdrop-filter: saturate(1.4) blur(14px);
  border: 1px solid rgba(255,255,255,0.12); border-radius: 6px; padding: 8px;
  display: flex; flex-direction: column; gap: 2px;
  box-shadow: 0 18px 44px rgba(0,0,0,0.42);
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
  z-index: 60;
}
.nav-dd:hover .nav-dd-menu, .nav-dd:focus-within .nav-dd-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-dd-menu a {
  display: flex; flex-direction: column; gap: 3px; padding: 11px 13px; border-radius: 4px;
  font-size: 14.5px; font-weight: 500; color: rgba(255,255,255,0.85);
  transition: background .15s ease, color .15s ease;
}
.nav-dd-menu a small {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--gray); font-weight: 400;
}
.nav-dd-menu a:hover { background: rgba(255,255,255,0.07); color: #fff; }
.nav-dd-menu a:hover small { color: rgba(255,255,255,0.6); }
.nav-dd-menu a.feat { margin-top: 6px; padding-top: 13px; border-top: 1px solid rgba(255,255,255,0.1); }
.nav-dd-menu a.feat small { color: var(--accent); }

/* ---- mobile menu (burger toggle) ---- */
.nav-burger.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-burger.is-open span:nth-child(2) { opacity: 0; }
.nav-burger.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-burger span { transition: transform .2s ease, opacity .2s ease; }
.nav.light .nav-burger span { background: #fff; }
@media (max-width: 760px) {
  .nav.nav-open { flex-wrap: wrap; }
  .nav.nav-open .nav-links {
    display: flex; flex-direction: column; align-items: flex-start; gap: 2px;
    width: 100%; order: 3; padding: 14px 0 4px; margin-top: 12px;
    border-top: 1px solid rgba(255,255,255,0.14);
  }
  .nav.nav-open .nav-links > a, .nav.nav-open .nav-dd-trigger { padding: 9px 0; font-size: 16px; }
  .nav.nav-open .nav-dd { display: block; width: 100%; }
  .nav.nav-open .nav-dd::after { display: none; }
  .nav.nav-open .nav-dd-menu {
    position: static; opacity: 1; visibility: visible; transform: none;
    background: transparent; border: 0; box-shadow: none; backdrop-filter: none;
    padding: 2px 0 8px 16px; min-width: 0; gap: 0;
  }
  .nav.nav-open .nav-dd-menu a { padding: 9px 0; }
  .nav.nav-open .nav-dd-menu a.feat { border-color: rgba(255,255,255,0.14); }
  .nav.nav-open .dd-caret { display: none; }
}