/* =========================================================
   bureaudetudes.net — Feuille de style principale
   TEG Training & Engineering Group
   Direction : sobre, éditoriale, à plat — pas de dégradés décoratifs
   ========================================================= */

:root {
  --color-primary: #0b3d62;
  --color-primary-dark: #082a45;
  --color-primary-light: #145a8c;
  --color-accent: #c8862b;
  --color-accent-light: #e0a94f;
  --color-accent-dark: #a06e22;
  --color-ink: #0f1a24;
  --color-text: #3d4854;
  --color-text-light: #6b7684;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f6f8;
  --color-bg-dark: #0b1f30;
  --color-border: #e2e5ea;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(15, 26, 36, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 26, 36, 0.08);
  --shadow-lg: 0 20px 45px rgba(15, 26, 36, 0.16);
  --shadow-glow: 0 10px 28px rgba(200, 134, 43, 0.32);
  --gradient-accent: linear-gradient(135deg, var(--color-accent-light), var(--color-accent) 60%, var(--color-accent-dark));
  --gradient-primary: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  --gradient-dark: linear-gradient(160deg, #102c42 0%, var(--color-bg-dark) 55%, #071522 100%);
  --container-w: 1200px;
  --font-heading: "Space Grotesk", "Segoe UI", Arial, sans-serif;
  --font-body: "Inter", "Segoe UI", Arial, sans-serif;
  --trans: 0.18s ease;
  --trans-slow: 0.4s cubic-bezier(.4,0,.2,1);
}

* , *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
main img {
  filter: grayscale(10%) saturate(1.12) contrast(1.03);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}
main .hero img { border-radius: 0; box-shadow: none; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--trans); }
ul, ol { padding-left: 1.25rem; }
li { margin-bottom: 0.4rem; }

::selection { background: var(--color-accent); color: #fff; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-ink);
  line-height: 1.15;
  margin: 0 0 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2.25rem, 4.4vw, 3.4rem); font-weight: 600; }
h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  margin-top: 3rem;
  position: relative;
  padding-bottom: 0.9rem;
}
h2::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 46px; height: 3px;
  border-radius: 3px;
  background: var(--gradient-accent);
}
.cta-banner h2::after, .text-center h2::after {
  left: 50%;
  transform: translateX(-50%);
}
h3 { font-size: 1.1rem; margin-top: 1.5rem; color: var(--color-ink); font-weight: 600; }
p { margin: 0 0 1.1rem; }

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section { padding: 5rem 0; }
.section-alt { background: linear-gradient(180deg, var(--color-bg-alt) 0%, #eef1f4 100%); }
.section-dark {
  position: relative;
  background: radial-gradient(circle at 85% 0%, rgba(200,134,43,0.14) 0%, rgba(200,134,43,0) 45%), var(--gradient-dark);
  color: #a9bacb;
  overflow: hidden;
}
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark .eyebrow { color: #a9bacb; }

.accent-word { color: var(--color-accent); }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: 1rem;
  font-family: var(--font-heading);
}
.eyebrow::before {
  content: "";
  width: 22px; height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
  flex-shrink: 0;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--trans);
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.site-header.scrolled { box-shadow: var(--shadow-md); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 1rem 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-ink);
}
.logo-mark {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  background: var(--gradient-primary);
  box-shadow: 0 4px 12px rgba(11, 61, 98, 0.35);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: transform var(--trans);
}
.logo:hover .logo-mark { transform: scale(1.06) rotate(-3deg); }
.logo-mark svg { width: 19px; height: 19px; }
.logo span.tagline {
  display: block;
  font-family: var(--font-body);
  font-size: 0.66rem;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: 0.02em;
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 1001;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--color-ink);
  margin: 5px 0;
}

.main-nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 1.7rem;
  align-items: center;
}
.main-nav a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.92rem;
  position: relative;
}
.main-nav > ul > li > a:not(.btn) { padding-bottom: 4px; }
.main-nav > ul > li > a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--gradient-accent);
  transition: width var(--trans);
}
.main-nav a:hover { color: var(--color-ink); }
.main-nav > ul > li > a:not(.btn):hover::after,
.main-nav > ul > li > a:not(.btn)[aria-current="page"]::after { width: 100%; }
.main-nav a[aria-current="page"] { color: var(--color-ink); font-weight: 600; }

.main-nav .dropdown { position: relative; }
.main-nav .dropdown-menu {
  position: absolute;
  top: 100%; left: 50%;
  transform: translateX(-50%) translateY(-6px);
  background: #fff;
  border: 1px solid var(--color-border);
  border-top: 2px solid var(--color-accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  list-style: none;
  margin: 1rem 0 0;
  padding: 0.6rem;
  min-width: 250px;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: opacity var(--trans-slow), transform var(--trans-slow);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.1rem;
}
.main-nav .dropdown:hover .dropdown-menu,
.main-nav .dropdown:focus-within .dropdown-menu {
  max-height: 400px;
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.main-nav .dropdown-menu a {
  display: block;
  padding: 0.5rem 0.6rem;
  font-weight: 500;
  font-size: 0.86rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: background var(--trans), color var(--trans), padding-left var(--trans);
}
.main-nav .dropdown-menu a:hover { background: var(--color-bg-alt); color: var(--color-accent-dark); padding-left: 0.9rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--trans), border-color var(--trans), color var(--trans), transform var(--trans), box-shadow var(--trans);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 2px 10px rgba(200, 134, 43, 0.25);
}
.btn-primary:hover { background: var(--color-accent-dark); box-shadow: var(--shadow-glow); }

.main-nav .btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  padding: 0.6rem 1.3rem;
  box-shadow: none;
}
.main-nav .btn-primary:hover { background: var(--color-primary-dark); color: #fff; box-shadow: 0 6px 16px rgba(11, 61, 98, 0.3); }
.main-nav .btn-primary[aria-current="page"] { color: #fff; }

#contact-form button.btn-primary {
  background: var(--gradient-primary);
}
#contact-form button.btn-primary:hover { background: var(--color-primary-dark); box-shadow: 0 6px 16px rgba(11, 61, 98, 0.3); }
.btn-outline {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-ink);
}
.btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent-dark); box-shadow: 0 6px 16px rgba(15, 26, 36, 0.1); }
.btn-light { background: #fff; color: var(--color-ink); }
.btn-light:hover { background: var(--color-bg-alt); box-shadow: 0 6px 16px rgba(15, 26, 36, 0.14); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background-color: var(--color-bg-dark);
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
  color: #dbe4ec;
  padding: 6rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  isolation: isolate;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(100deg, rgba(8,20,32,0.94) 0%, rgba(8,20,32,0.84) 45%, rgba(11,61,98,0.55) 100%);
}
.hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  width: 560px; height: 560px;
  right: -180px; top: -220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200,134,43,0.35) 0%, rgba(200,134,43,0) 70%);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  max-width: 62ch;
}
.hero h1 { color: #fff; }
.hero .accent-word {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead { font-size: 1.08rem; color: #dbe4ec; max-width: 46ch; }
.hero-cta { display: flex; gap: 0.9rem; flex-wrap: wrap; margin-top: 1.75rem; }
.hero-stats { display: flex; gap: 2.5rem; margin-top: 3rem; flex-wrap: wrap; border-top: 1px solid rgba(255,255,255,0.16); padding-top: 1.75rem; }
.hero-stats div strong {
  display: block;
  font-size: 1.85rem;
  font-family: var(--font-heading);
  font-weight: 600;
  background: linear-gradient(135deg, #fff, var(--color-accent-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-stats div span { font-size: 0.82rem; color: #c3d1de; }

.breadcrumb {
  position: relative;
  background: var(--color-bg-alt);
  padding: 0.9rem 0;
  font-size: 0.84rem;
  border-bottom: 1px solid var(--color-border);
}
.breadcrumb::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 64px; height: 2px;
  background: var(--gradient-accent);
}
.breadcrumb ol { list-style: none; display: flex; gap: 0.4rem; margin: 0; padding: 0; flex-wrap: wrap; }
.breadcrumb li:not(:last-child)::after { content: "/"; margin-left: 0.4rem; color: var(--color-text-light); }
.breadcrumb a { color: var(--color-text-light); font-weight: 500; transition: color var(--trans); }
.breadcrumb a:hover { color: var(--color-accent-dark); }
.breadcrumb li[aria-current] { color: var(--color-ink); font-weight: 600; }

/* ---------- Cards / Grids ---------- */
.grid { display: grid; gap: 1.5rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  overflow: hidden;
  transition: border-color var(--trans), transform var(--trans-slow), box-shadow var(--trans-slow);
}
.card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--trans-slow);
}
.card:hover {
  border-color: #c7cedb;
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.card:hover::before { transform: scaleX(1); }
.card .icon {
  position: relative;
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.25rem;
  color: #fff;
  z-index: 1;
  border-radius: var(--radius-sm);
  background: var(--gradient-primary);
  transition: transform var(--trans-slow);
}
.card:hover .icon { transform: rotate(-4deg) scale(1.05); }
.card .icon::before {
  content: "";
  position: absolute;
  z-index: -1;
  width: 30px; height: 30px;
  right: -8px; bottom: -8px;
  border-radius: 50%;
  background: rgba(200, 134, 43, 0.35);
}
.card .icon svg { width: 22px; height: 22px; }
.card h3 { margin-top: 0; }

.country-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.1rem;
  font-weight: 500;
  color: var(--color-ink);
  transition: border-color var(--trans), background var(--trans), transform var(--trans);
}
.country-card:hover {
  border-color: var(--color-accent);
  background: var(--color-bg-alt);
  transform: translateX(3px);
}
.country-card .arrow { color: var(--color-text-light); transition: transform var(--trans), color var(--trans); display: inline-block; }
.country-card:hover .arrow { color: var(--color-accent-dark); transform: translateX(4px); }

.process-steps { list-style: none; padding: 0; display: grid; gap: 0; counter-reset: step; }
.process-steps li {
  counter-increment: step;
  position: relative;
  padding: 1.5rem 0 1.5rem 3rem;
  border-top: 1px solid var(--color-border);
  transition: padding-left var(--trans-slow);
}
.process-steps li:last-child { border-bottom: 1px solid var(--color-border); }
.process-steps li:hover { padding-left: 3.5rem; }
.process-steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute; left: 0; top: 1.6rem;
  font-family: var(--font-heading);
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 0.95rem;
}

.accordion { border-top: 1px solid var(--color-border); }
.accordion-item { border-bottom: 1px solid var(--color-border); transition: background var(--trans); }
.accordion-item[open] { background: linear-gradient(180deg, rgba(200,134,43,0.05), rgba(200,134,43,0)); }
.accordion-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.35rem 0.5rem;
  margin: 0 -0.5rem;
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-ink);
  list-style: none;
  transition: color var(--trans);
  border-radius: var(--radius-sm);
}
.accordion-item summary:hover { color: var(--color-accent-dark); }
.accordion-item summary::-webkit-details-marker { display: none; }
.accordion-item summary .plus {
  flex-shrink: 0;
  width: 22px; height: 22px;
  position: relative;
}
.accordion-item summary .plus::before, .accordion-item summary .plus::after {
  content: "";
  position: absolute;
  background: var(--color-ink);
  transition: transform var(--trans), background var(--trans);
}
.accordion-item summary .plus::before { left: 0; top: 50%; width: 100%; height: 1.5px; transform: translateY(-50%); }
.accordion-item summary .plus::after { top: 0; left: 50%; height: 100%; width: 1.5px; transform: translateX(-50%); }
.accordion-item[open] summary .plus::before,
.accordion-item[open] summary .plus::after { background: var(--color-accent); }
.accordion-item[open] summary .plus::after { transform: translateX(-50%) rotate(90deg); opacity: 0; }
.accordion-item .accordion-body { padding: 0 0.5rem 1.5rem; color: var(--color-text); max-width: 68ch; }

.quote-block {
  position: relative;
  border-left: 2px solid transparent;
  border-image: var(--gradient-accent) 1;
  padding: 1rem 1.5rem 1rem 2.5rem;
  font-style: normal;
  font-size: 1.1rem;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: 500;
  letter-spacing: -0.01em;
}
.quote-block::before {
  content: "\201C";
  position: absolute;
  left: 0.35rem; top: -0.2rem;
  font-size: 2.6rem;
  font-family: Georgia, serif;
  color: var(--color-accent);
  opacity: 0.55;
  line-height: 1;
}

.cta-banner {
  position: relative;
  background: radial-gradient(circle at 12% 0%, rgba(200,134,43,0.32) 0%, rgba(200,134,43,0) 45%), var(--gradient-dark);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 3.5rem;
  text-align: center;
  margin: 3rem 0;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.cta-banner::before, .cta-banner::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 50%;
  width: 340px; height: 340px;
  right: -120px; bottom: -160px;
  pointer-events: none;
}
.cta-banner::after { width: 460px; height: 460px; right: -180px; bottom: -230px; border-color: rgba(255,255,255,0.08); }
.cta-banner > * { position: relative; }
.cta-banner h2 { color: #fff; margin-top: 0; }
.cta-banner p { color: #a9bacb; max-width: 60ch; margin-inline: auto; }
.cta-banner p a { color: var(--color-accent-light); text-decoration: underline; text-underline-offset: 2px; }
.cta-banner p a:hover { color: #fff; }

/* ---------- Forms ---------- */
.form-grid { display: grid; gap: 1.1rem; grid-template-columns: 1fr 1fr; }
.form-grid .full { grid-column: 1 / -1; }
label { display: block; font-weight: 600; margin-bottom: 0.35rem; font-size: 0.88rem; color: var(--color-ink); }
input, select, textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: #fff;
  color: var(--color-text);
  transition: border-color var(--trans), box-shadow var(--trans);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(200, 134, 43, 0.18);
}
.form-note { font-size: 0.85rem; color: var(--color-text-light); }
#form-feedback { margin-top: 1rem; font-weight: 600; }

.contact-info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; margin: 2rem 0 3rem; }
.contact-info-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: transform var(--trans-slow), box-shadow var(--trans-slow);
}
.contact-info-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.contact-info-card h3 { margin-top: 0; font-size: 0.95rem; }
.map-embed { border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-md); line-height: 0; }
.map-embed iframe { width: 100%; height: 420px; display: block; border: 0; }

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background: var(--gradient-dark);
  color: #8798a9;
  padding: 3.5rem 0 1.5rem;
  font-size: 0.9rem;
}
.site-footer::before {
  content: "";
  position: absolute;
  left: 0; top: 0; right: 0;
  height: 3px;
  background: var(--gradient-accent);
}
.footer-newsletter {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  align-items: center;
  padding-bottom: 2.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-newsletter h2 { color: #fff; font-size: 1.2rem; margin: 0 0 0.35rem; }
.footer-newsletter p { margin: 0; color: #8798a9; }
.footer-newsletter form { display: flex; gap: 0.6rem; }
.footer-newsletter input {
  flex: 1;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.16);
  color: #fff;
}
.footer-newsletter input::placeholder { color: #8798a9; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 2rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-grid h4 { color: #fff; font-size: 0.85rem; margin-bottom: 1rem; font-family: var(--font-heading); font-weight: 600; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid ul li { margin-bottom: 0.6rem; }
.footer-grid a { color: #8798a9; }
.footer-grid a:hover { color: #fff; }
.footer-brand p { color: #7d90a3; max-width: 32ch; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: #62738a;
}
.footer-bottom a { color: #62738a; }
.social-links { display: flex; gap: 0.6rem; }
.social-links a {
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.14);
  display: flex; align-items: center; justify-content: center;
  color: #dbe4ec;
  font-size: 0.82rem;
  transition: background var(--trans), border-color var(--trans), color var(--trans), transform var(--trans);
}
.social-links a:hover {
  border-color: transparent;
  background: var(--gradient-accent);
  color: #fff;
  transform: translateY(-2px);
}

.back-to-top {
  position: fixed;
  bottom: 1.5rem; right: 1.5rem;
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--gradient-primary);
  box-shadow: var(--shadow-md);
  color: #fff;
  border: none;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  opacity: 0; visibility: hidden;
  transform: translateY(6px);
  transition: opacity var(--trans), visibility var(--trans), transform var(--trans), box-shadow var(--trans);
  z-index: 998;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(10px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.max-prose { max-width: 70ch; }
.tag-list { display: flex; flex-wrap: wrap; gap: 0.5rem; list-style: none; padding: 0; }
.tag-list li {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
  font-weight: 500;
  color: var(--color-ink);
  margin: 0;
  transition: background var(--trans), border-color var(--trans), color var(--trans);
}
.tag-list li:hover { background: var(--color-ink); border-color: var(--color-ink); color: #fff; }
table.compare { width: 100%; border-collapse: collapse; margin: 1.5rem 0; border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-sm); }
table.compare th, table.compare td { border: 1px solid var(--color-border); padding: 0.8rem; text-align: left; font-size: 0.9rem; }
table.compare th { background: var(--gradient-primary); color: #fff; font-family: var(--font-heading); font-weight: 600; border-color: var(--color-primary); }
table.compare tr:hover td { background: var(--color-bg-alt); }
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--color-ink); color: #fff; padding: 0.75rem 1.25rem; z-index: 1100;
}
.skip-link:focus { left: 1rem; top: 1rem; }

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 14, 18, 0.5);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--trans), visibility var(--trans);
}
.nav-overlay.visible {
  opacity: 1;
  visibility: visible;
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-newsletter { grid-template-columns: 1fr; }
  .contact-info-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .main-nav {
    position: fixed; inset: 0 0 0 auto;
    width: min(320px, 85vw);
    background: #fff;
    padding: 5.5rem 1.5rem 2rem;
    transform: translateX(100%);
    transition: transform var(--trans);
    box-shadow: var(--shadow-md);
    overflow-y: auto;
  }
  .main-nav.open { transform: translateX(0); }
  .main-nav ul { flex-direction: column; align-items: flex-start; gap: 0.25rem; width: 100%; }
  .main-nav .dropdown-menu { position: static; transform: none; box-shadow: none; grid-template-columns: 1fr; max-height: 0; }
  .main-nav .dropdown:hover .dropdown-menu, .main-nav .dropdown:focus-within .dropdown-menu { max-height: 600px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 1.5rem; }
  .cta-banner { padding: 2.25rem 1.4rem; }
}