/* ===== NetOpsAI – stylesheet ===== */
:root {
  --bg: #0b1220;
  --bg-alt: #0f182b;
  --surface: #131e35;
  --border: #22304d;
  --text: #e6ecf5;
  --muted: #9aa8bf;
  --primary: #22d3ee;
  --primary-2: #6366f1;
  --grad: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  font-family: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .6em; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 820px; }

/* ----- buttons ----- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 26px; border-radius: 10px; border: 0;
  background: var(--grad); color: #04111f; font-weight: 700; font-size: 15px;
  font-family: inherit; cursor: pointer;
  transition: transform .2s, box-shadow .2s, opacity .2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(34, 211, 238, .3); }
.btn:disabled { opacity: .6; cursor: wait; transform: none; }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--primary); box-shadow: none; }
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-block { width: 100%; }

.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--primary); margin-bottom: 12px;
}
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ----- header ----- */
.header {
  position: fixed; inset: 0 0 auto; z-index: 50;
  background: rgba(11, 18, 32, .75); backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent; transition: border-color .3s;
}
.header.scrolled { border-bottom-color: var(--border); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 800; font-size: 20px; }
.logo b { color: var(--primary); }
.menu { display: flex; align-items: center; gap: 30px; }
.menu a:not(.btn) { color: var(--muted); font-weight: 500; font-size: 15px; transition: color .2s; }
.menu a:not(.btn):hover { color: var(--text); }
.menu-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.menu-toggle span { display: block; width: 24px; height: 2px; margin: 5px 0; background: var(--text); transition: .3s; }
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ----- hero ----- */
.hero { position: relative; padding: 150px 0 90px; overflow: hidden; }
.hero-grid-bg {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(34, 211, 238, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, .06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 70% 40%, #000 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 70% 40%, #000 20%, transparent 70%);
}
.hero-inner { position: relative; display: grid; grid-template-columns: 1.15fr .85fr; gap: 50px; align-items: center; }
.hero h1 { font-size: clamp(32px, 4.6vw, 54px); font-weight: 800; letter-spacing: -.02em; }
.lead { font-size: 18px; color: var(--muted); max-width: 560px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin: 30px 0 26px; }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px 24px; list-style: none; padding: 0; margin: 0; color: var(--muted); font-size: 14px; }
.hero-points li::before { content: "✓"; color: var(--primary); font-weight: 700; margin-right: 8px; }

.network-svg { width: 100%; max-width: 440px; margin: 0 auto; display: block; }
.network-svg .links line { stroke: #2b3d63; stroke-width: 1.5; stroke-dasharray: 5 6; animation: dash 6s linear infinite; }
.network-svg .nodes circle { fill: var(--surface); stroke: var(--primary); stroke-width: 2; }
.network-svg .core { fill: var(--primary-2); }
.network-svg .core-ring { fill: none; stroke: var(--primary); stroke-width: 2; opacity: .5; transform-origin: 200px 180px; animation: pulse 2.6s ease-out infinite; }
.network-svg .core-text { fill: #fff; font-weight: 800; font-size: 24px; font-family: inherit; }
@keyframes dash { to { stroke-dashoffset: -110; } }
@keyframes pulse { 0% { transform: scale(.8); opacity: .8; } 100% { transform: scale(1.4); opacity: 0; } }

/* ----- stats ----- */
.stats { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-alt); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 34px 16px; text-align: center; }
.stat + .stat { border-left: 1px solid var(--border); }
.stat strong { display: block; font-size: 38px; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { color: var(--muted); font-size: 14px; }

/* ----- sections ----- */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 56px; }
.section h2 { font-size: clamp(26px, 3.2vw, 38px); font-weight: 800; letter-spacing: -.01em; }
.section-head p { color: var(--muted); }

/* ----- service cards ----- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 28px; transition: transform .25s, border-color .25s, box-shadow .25s;
}
.card:hover { transform: translateY(-6px); border-color: var(--primary); box-shadow: var(--shadow); }
.card-featured { background: linear-gradient(180deg, rgba(99, 102, 241, .14), var(--surface) 60%); }
.card-icon {
  width: 54px; height: 54px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(34, 211, 238, .1); margin-bottom: 20px;
}
.card-icon svg, .mini svg, .contact-info svg {
  width: 28px; height: 28px; fill: none; stroke: var(--primary); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.card h3 { font-size: 21px; }
.card p { color: var(--muted); font-size: 15px; }
.card ul { list-style: none; padding: 0; margin: 0; font-size: 14.5px; }
.card li { padding: 6px 0 6px 24px; position: relative; }
.card li::before { content: ""; position: absolute; left: 0; top: 14px; width: 12px; height: 2px; background: var(--grad); }

.mini-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 24px; }
.mini { display: flex; gap: 16px; align-items: flex-start; padding: 22px; border: 1px dashed var(--border); border-radius: var(--radius); }
.mini svg { flex: none; }
.mini h4 { font-size: 16px; margin-bottom: 4px; }
.mini p { color: var(--muted); font-size: 14px; margin: 0; }

/* ----- about ----- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-grid > div:first-child p { color: var(--muted); }
.about-grid b { color: var(--text); }
.why-list { display: grid; gap: 16px; }
.why { display: flex; gap: 18px; padding: 20px 22px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.why-num { font-size: 22px; font-weight: 800; color: var(--primary); min-width: 36px; }
.why h4 { font-size: 17px; margin-bottom: 4px; }
.why p { color: var(--muted); font-size: 14.5px; margin: 0; }

/* ----- process ----- */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: s; }
.steps li { position: relative; padding: 28px 24px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.steps li span {
  display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%;
  background: var(--grad); color: #04111f; font-weight: 800; margin-bottom: 16px;
}
.steps h4 { font-size: 18px; }
.steps p { color: var(--muted); font-size: 14.5px; margin: 0; }

/* ----- faq ----- */
.faq { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 14px; padding: 0 24px; }
.faq summary { cursor: pointer; list-style: none; padding: 20px 30px 20px 0; font-weight: 600; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: 16px; font-size: 24px; color: var(--primary); transition: transform .25s; }
.faq[open] summary::after { transform: rotate(45deg); }
.faq p { color: var(--muted); padding-bottom: 20px; margin: 0; }

/* ----- contact ----- */
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 60px; align-items: start; }
.contact-grid > div > p { color: var(--muted); }
.contact-info { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 16px; }
.contact-info li { display: flex; align-items: center; gap: 14px; }
.contact-info a, .contact-info span { color: var(--text); }

.form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form label { display: block; font-size: 14px; font-weight: 500; color: var(--muted); margin-bottom: 16px; }
.form input, .form select, .form textarea {
  display: block; width: 100%; margin-top: 6px; padding: 12px 14px;
  background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 10px;
  font: inherit; font-size: 15px; transition: border-color .2s;
}
.form textarea { resize: vertical; }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--primary); }
.form .invalid { border-color: #f87171; }
.hp { position: absolute !important; left: -9999px !important; }
.form-status { margin: 14px 0 0; font-size: 14px; min-height: 1.4em; }
.form-status.ok { color: #4ade80; }
.form-status.err { color: #f87171; }

/* ----- footer ----- */
.footer { border-top: 1px solid var(--border); padding: 28px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer p { margin: 0; color: var(--muted); font-size: 14px; }
.footer .logo { font-size: 17px; }

/* ----- reveal animation ----- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ----- responsive ----- */
@media (max-width: 960px) {
  .hero-inner, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { order: -1; max-width: 300px; margin: 0 auto; }
  .cards, .mini-cards { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(3) { border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--border); }
}
@media (max-width: 760px) {
  .menu-toggle { display: block; }
  .menu {
    position: fixed; top: 68px; left: 0; right: 0; flex-direction: column; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 10px 20px 20px; transform: translateY(-120%); transition: transform .3s; z-index: -1;
  }
  .menu.open { transform: none; }
  .menu a { width: 100%; padding: 14px 0; border-bottom: 1px solid var(--border); }
  .menu a.btn { margin-top: 14px; border: 0; }
  .hero { padding: 110px 0 60px; }
  .section { padding: 70px 0; }
  .form { padding: 22px; }
  .form .row { grid-template-columns: 1fr; gap: 0; }
}
@media (max-width: 480px) {
  .steps { grid-template-columns: 1fr; }
  .stat strong { font-size: 30px; }
  .footer-inner { justify-content: center; text-align: center; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}