:root {
  /* Brand greens from the OptiNet logo */
  --primary: #017f5f;
  --primary-dark: #016349;
  --accent: #7aba4f;
  --ink: #10261f;
  --muted: #536a62;
  --bg: #ffffff;
  --bg-alt: #f2f7f3;
  --dark: #06281f;
  --dark-2: #0c372b;
  --line: #d9e6de;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(6, 40, 31, .08);
  --dark-text: #b4cbc1;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
img, svg { max-width: 100%; }
a { color: var(--primary); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); font-weight: 800; letter-spacing: -.02em; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); font-weight: 800; letter-spacing: -.01em; }
h3 { font-size: 1.15rem; font-weight: 700; }
p { margin: 0 0 1em; }

.container { width: min(1140px, 100% - 32px); margin-inline: auto; }
.narrow { width: min(780px, 100% - 32px); }

.eyebrow {
  text-transform: uppercase; letter-spacing: .12em; font-size: .78rem;
  font-weight: 700; color: var(--primary); margin-bottom: .6em;
}
.hl { background: linear-gradient(90deg, var(--primary), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* Buttons */
.btn {
  display: inline-block; padding: .85em 1.5em; border-radius: 999px;
  background: var(--primary); color: #fff; font-weight: 600; text-decoration: none;
  border: 2px solid var(--primary); cursor: pointer; font: inherit; font-weight: 600;
  transition: background .2s, transform .2s;
}
.btn:hover { background: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--primary); }
.btn-ghost:hover { background: var(--primary); color: #fff; }
.btn-sm { padding: .5em 1.1em; }
.btn-block { width: 100%; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 20px; height: 68px; }
.nav .brand { margin-right: auto; }
.brand { display: flex; align-items: center; }
.brand img { height: 52px; width: auto; display: block; }
@media (max-width: 640px) { .brand img { height: 40px; } }
.nav-menu { display: flex; align-items: center; gap: 24px; }
.nav-menu a:not(.btn) { color: var(--ink); text-decoration: none; font-weight: 500; font-size: .95rem; }
.nav-menu a:not(.btn):hover { color: var(--primary); }
.nav-right { display: flex; align-items: center; gap: 12px; order: 3; }
.lang-switch { display: flex; border: 1px solid var(--line); border-radius: 999px; padding: 3px; }
.lang-switch button {
  font: inherit; font-size: .8rem; font-weight: 700; border: 0; background: none; color: var(--muted);
  padding: .3em .75em; border-radius: 999px; cursor: pointer;
}
.lang-switch button[aria-pressed="true"] { background: var(--primary); color: #fff; }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--ink); margin: 5px 0; transition: .2s; }

/* Hero */
.hero {
  padding: 80px 0 90px;
  background:
    radial-gradient(circle at 85% 20%, rgba(122,186,79,.15), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(1,127,95,.10), transparent 45%),
    var(--bg);
}
.hero-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 560px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 28px 0 36px; }
.hero-stats { display: flex; gap: 32px; list-style: none; padding: 0; margin: 0; flex-wrap: wrap; }
.hero-stats strong { display: block; font-size: 1.6rem; font-weight: 800; }
.hero-stats span { color: var(--muted); font-size: .9rem; }

.hero-visual svg { width: 100%; height: auto; }
.hero-visual .link rect { fill: #fff; stroke: var(--line); stroke-width: 1.5; filter: drop-shadow(0 4px 10px rgba(6,40,31,.08)); }
.hero-visual text { font: 600 14px Inter, sans-serif; text-anchor: middle; fill: var(--ink); }
.hero-visual .flow { fill: none; stroke: var(--primary); stroke-width: 2.5; stroke-dasharray: 6 6; animation: dash 1.2s linear infinite; }
.hero-visual .flow.down { stroke: #c4ccd8; animation: none; }
.hero-visual .bond { stroke: var(--accent); stroke-width: 7; stroke-linecap: round; }
.hero-visual .box-t { fill: #fff; font-weight: 800; }
.hero-visual .cloud { fill: var(--dark); }
.hero-visual .cloud-t { fill: #fff; font-weight: 700; font-size: 13px; }
@keyframes dash { to { stroke-dashoffset: -24; } }

/* Sections */
.section { padding: 90px 0; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--dark); color: #e4efe9; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark .eyebrow { color: var(--accent); }
.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head p:not(.eyebrow) { color: var(--muted); font-size: 1.05rem; }
.section-dark .section-head p:not(.eyebrow) { color: var(--dark-text); }

/* Cards */
.cards { display: grid; gap: 22px; }
.cards-2 { grid-template-columns: repeat(2, 1fr); }
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.cards-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow); transition: transform .2s;
}
.card:hover { transform: translateY(-3px); }
.card p { color: var(--muted); margin: 0; }
.card .icon {
  width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(1,127,95,.12), rgba(122,186,79,.18)); font-size: 1.4rem; margin-bottom: 16px;
}
.card-lg { border-top: 4px solid var(--primary); }

/* Steps */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; counter-reset: s; }
.steps li { background: #fff; border-radius: var(--radius); padding: 32px 28px; border: 1px solid var(--line); position: relative; }
.steps p { color: var(--muted); margin: 0; }
.num {
  display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); color: #fff; font-weight: 800; margin-bottom: 18px;
}

/* Configurator */
.config {
  background: var(--dark-2); border: 1px solid rgba(255,255,255,.08); border-radius: var(--radius);
  padding: 32px; display: grid; gap: 28px; margin-bottom: 40px;
}
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
legend { font-weight: 700; color: #fff; margin-bottom: 14px; }
.options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.options.pills { display: flex; flex-wrap: wrap; gap: 10px; }
.opt input, .pill input { position: absolute; opacity: 0; pointer-events: none; }
.opt > span span { display: block; }
.opt > span {
  display: block; padding: 18px; border-radius: 12px; border: 2px solid rgba(255,255,255,.12);
  cursor: pointer; transition: .2s; color: var(--dark-text); height: 100%;
}
.opt strong { display: block; color: #fff; font-size: 1.1rem; }
.opt em { display: block; font-style: normal; font-size: .85rem; margin-top: 4px; }
.pill span {
  display: inline-block; padding: .55em 1.2em; border-radius: 999px; cursor: pointer;
  border: 2px solid rgba(255,255,255,.15); color: #e4efe9; font-weight: 600; transition: .2s;
}
.opt input:checked + span, .pill input:checked + span { border-color: var(--accent); background: rgba(122,186,79,.1); }
.opt input:focus-visible + span, .pill input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.config-summary {
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  border-top: 1px solid rgba(255,255,255,.1); padding-top: 22px;
}
.config-summary p { margin: 0; }
.config-summary strong { color: var(--accent); }

.plan { background: var(--dark-2); border-color: rgba(255,255,255,.08); box-shadow: none; }
.plan ul { padding-left: 1.1em; color: var(--dark-text); margin: 0 0 22px; }
.plan .tag { font-size: .75rem; text-transform: uppercase; letter-spacing: .1em; color: var(--accent); font-weight: 700; }
.plan.featured { border: 2px solid var(--accent); }

/* About */
.about { display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px; align-items: center; }
.about p:not(.eyebrow) { color: var(--muted); }
.checks { list-style: none; padding: 0; margin: 0; }
.checks li { padding-left: 30px; position: relative; margin-bottom: 10px; font-weight: 500; }
.checks li::before { content: "\2713"; position: absolute; left: 0; color: var(--accent); font-weight: 800; }
.partners ul { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.partners li {
  background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 16px;
  text-align: center; font-weight: 700; color: var(--muted);
}

/* FAQ */
details { border-bottom: 1px solid var(--line); padding: 18px 0; }
summary { cursor: pointer; font-weight: 600; font-size: 1.05rem; list-style: none; position: relative; padding-right: 32px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 0; top: -2px; font-size: 1.5rem; color: var(--primary); transition: transform .2s; }
details[open] summary::after { transform: rotate(45deg); }
details p { color: var(--muted); margin: 12px 0 0; }

/* Contact */
.contact { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: start; }
.contact p:not(.eyebrow) { color: var(--dark-text); }
.contact-list { list-style: none; padding: 0; margin: 28px 0 0; }
.contact-list li { padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.08); }
.contact-list .plain { display: inline; font-size: inherit; text-transform: none; letter-spacing: 0; color: inherit; }
.contact-list span:not(.plain) { display: block; font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; color: #8aa79b; }
.contact-list a { color: #fff; font-weight: 600; text-decoration: none; font-size: 1.1rem; }
.contact-form { background: #fff; color: var(--ink); border-radius: var(--radius); padding: 32px; display: grid; gap: 16px; }
.contact-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form label { display: grid; gap: 6px; font-weight: 600; font-size: .9rem; }
.contact-form input, .contact-form select, .contact-form textarea {
  font: inherit; font-weight: 400; padding: .75em .9em; border: 1px solid var(--line); border-radius: 10px; width: 100%;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { outline: 2px solid var(--primary); border-color: transparent; }
.form-note { font-size: .8rem; color: var(--muted) !important; margin: 0; text-align: center; }

/* Footer */
.site-footer { background: #041c16; color: #8aa79b; padding: 28px 0; font-size: .9rem; }
.site-footer strong { color: #fff; }
.footer-grid { display: flex; justify-content: space-between; align-items: center; gap: 16px 32px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 12px 24px; flex-wrap: wrap; }
.footer-logo img { height: 48px; width: auto; display: block; }
.footer-grid p { margin: 0; }

/* Responsive */
@media (max-width: 960px) {
  .cards-3, .cards-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-grid, .about, .contact { grid-template-columns: 1fr; }
  .hero-visual { max-width: 480px; }
}
.nav-menu a { white-space: nowrap; }
@media (max-width: 1100px) {
  .nav-toggle { display: block; }
  .nav-menu {
    position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; align-items: stretch;
    gap: 0; background: #fff; border-bottom: 1px solid var(--line); padding: 8px 16px 16px; display: none;
  }
  .nav-menu.open { display: flex; }
  .nav-menu a:not(.btn) { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav-menu .btn { margin-top: 12px; text-align: center; }
}
@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .hero { padding: 48px 0 64px; }
  .cards-2, .cards-3, .cards-4, .steps, .options { grid-template-columns: 1fr; }
  .contact-form .row { grid-template-columns: 1fr; }
  .config, .contact-form { padding: 22px; }
  .hero-stats { gap: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}