/* ============================================================
   COREBEAM TELECOMM · Design System v1.0
   Based on Brand Guidelines 2026.04
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@300;400;500;600&family=IBM+Plex+Sans:wght@300;400;500;600;700&display=swap');

:root {
  /* Palette — from brandbook */
  --core-black:    #08090B;
  --graphite:      #13161B;
  --slate:         #1A1E25;
  --fiber-green:   #A8E000;
  --deep-fiber:    #6B8F00;
  --platinum:      #E8ECEF;
  --mute:          #7C8591;
  --mute-2:        #4A5260;
  --divider:       rgba(232, 236, 239, 0.08);

  /* Typography */
  --font-sans: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  /* Scale */
  --nav-h: 128px;
  --container: 1280px;
  --gutter: clamp(20px, 4vw, 48px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-weight: 400;
  background: var(--core-black);
  color: var(--platinum);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ============================================================
   Background atmospherics — grid + scanlines
   ============================================================ */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(232, 236, 239, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 236, 239, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse at center top, black 20%, transparent 80%);
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(168, 224, 0, 0.04), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

main, nav, footer { position: relative; z-index: 1; }

/* ============================================================
   Navigation
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  height: var(--nav-h);
  background: rgba(8, 9, 11, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--divider);
  z-index: 100;
}

.nav-inner {
  max-width: var(--container);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.nav-logo { height: 76px; width: auto; display: block; }
.nav-logo svg { height: 100%; width: auto; display: block; }

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
  list-style: none;
}

.nav-links a {
  color: var(--platinum);
  text-decoration: none;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.02em;
  transition: color 0.2s;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active { color: var(--fiber-green); }

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -22px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--fiber-green);
}

.nav-cta {
  padding: 8px 16px;
  border: 1px solid var(--fiber-green);
  color: var(--fiber-green) !important;
  font-family: var(--font-mono);
  font-size: 12px !important;
  text-transform: uppercase;
  letter-spacing: 0.1em !important;
  transition: all 0.2s;
}

.nav-cta:hover {
  background: var(--fiber-green);
  color: var(--core-black) !important;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--platinum);
  cursor: pointer;
  padding: 8px;
}

.nav-toggle svg { width: 22px; height: 22px; }

@media (max-width: 860px) {
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--core-black);
    flex-direction: column;
    padding: 24px var(--gutter);
    gap: 20px;
    border-bottom: 1px solid var(--divider);
    transform: translateY(-110%);
    transition: transform 0.3s;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a.active::after { display: none; }
  .nav-toggle { display: block; }
}

/* ============================================================
   Containers & layout
   ============================================================ */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

section { padding: clamp(64px, 10vw, 120px) 0; }
section + section { border-top: 1px solid var(--divider); }

/* ============================================================
   Typography system
   ============================================================ */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--fiber-green);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  margin-bottom: 20px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--fiber-green);
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--platinum);
}

h1 {
  font-size: clamp(44px, 7vw, 88px);
  font-weight: 300;
}
h1 strong { font-weight: 600; }

h2 {
  font-size: clamp(32px, 4.5vw, 54px);
  margin-bottom: 24px;
}
h2 strong { font-weight: 600; }

h3 {
  font-size: clamp(22px, 2.2vw, 28px);
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

h4 {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.3;
}

p { color: var(--mute); font-size: 16px; max-width: 64ch; }
p strong { color: var(--platinum); font-weight: 500; }

.lead { font-size: clamp(17px, 1.5vw, 20px); color: var(--platinum); opacity: 0.85; }

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mute);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

a { color: var(--fiber-green); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 4px; }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border: 1px solid;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--fiber-green);
  border-color: var(--fiber-green);
  color: var(--core-black);
}
.btn-primary:hover {
  background: transparent;
  color: var(--fiber-green);
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  border-color: var(--mute-2);
  color: var(--platinum);
}
.btn-ghost:hover {
  border-color: var(--fiber-green);
  color: var(--fiber-green);
  text-decoration: none;
}

.btn svg { width: 14px; height: 14px; }

/* ============================================================
   HERO (home)
   ============================================================ */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  align-items: center;
  padding: 80px 0 120px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 80px;
  align-items: center;
}

.hero-coord {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mute-2);
  letter-spacing: 0.18em;
  margin-bottom: 40px;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.hero-coord span::before { content: '// '; color: var(--fiber-green); }

.hero-sub {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--platinum);
  opacity: 0.75;
  margin-top: 32px;
  max-width: 48ch;
  line-height: 1.7;
}

.hero-actions {
  margin-top: 48px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Hero visual — ASCII-style diagram */
.hero-viz {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid var(--divider);
  background:
    radial-gradient(circle at 50% 50%, rgba(168, 224, 0, 0.05), transparent 60%),
    var(--graphite);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-viz::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(168, 224, 0, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 224, 0, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
}

.hero-viz-label {
  position: absolute;
  top: 16px;
  left: 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--mute);
  letter-spacing: 0.15em;
}

.hero-viz-label span { color: var(--fiber-green); }

.hero-viz-status {
  position: absolute;
  bottom: 16px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fiber-green);
  letter-spacing: 0.15em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pulse {
  width: 8px; height: 8px;
  background: var(--fiber-green);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(168, 224, 0, 0.4); }
  50% { opacity: 0.6; box-shadow: 0 0 0 8px rgba(168, 224, 0, 0); }
}

.prism-svg { width: 94%; height: auto; position: relative; z-index: 2; }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-viz { max-width: 420px; margin: 0 auto; }
}

/* ============================================================
   Metrics strip
   ============================================================ */
.metrics {
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
  background: var(--graphite);
  padding: 40px 0;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.metric {
  border-left: 1px solid var(--divider);
  padding-left: 20px;
}

.metric-value {
  font-family: var(--font-sans);
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 300;
  color: var(--platinum);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 10px;
}

.metric-value strong { font-weight: 600; color: var(--fiber-green); }

.metric-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--mute);
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

@media (max-width: 860px) {
  .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
}

/* ============================================================
   Section head
   ============================================================ */
.section-head {
  max-width: 720px;
  margin-bottom: 72px;
}

.section-head .lead { margin-top: 20px; }

/* ============================================================
   Service cards (home + service pages)
   ============================================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--divider);
  border: 1px solid var(--divider);
}

.service-card {
  background: var(--core-black);
  padding: 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: background 0.3s;
  position: relative;
}

.service-card:hover { background: var(--graphite); }

.service-card-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fiber-green);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.service-card ul {
  list-style: none;
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--divider);
}

.service-card ul li {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mute);
  padding: 4px 0;
  display: flex;
  gap: 10px;
}

.service-card ul li::before {
  content: '+';
  color: var(--fiber-green);
  flex-shrink: 0;
}

@media (max-width: 860px) {
  .services-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   Feature list (service pages detail)
   ============================================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--divider);
  border: 1px solid var(--divider);
  margin-top: 40px;
}

.feature {
  background: var(--core-black);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fiber-green);
  letter-spacing: 0.2em;
}

.feature p { font-size: 14px; }

@media (max-width: 860px) {
  .feature-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   Spec table
   ============================================================ */
.spec-table {
  margin-top: 48px;
  border: 1px solid var(--divider);
  font-family: var(--font-mono);
  font-size: 13px;
}

.spec-row {
  display: grid;
  grid-template-columns: 240px 1fr;
  border-bottom: 1px solid var(--divider);
}
.spec-row:last-child { border-bottom: none; }

.spec-key {
  padding: 16px 24px;
  background: var(--graphite);
  color: var(--mute);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  border-right: 1px solid var(--divider);
}

.spec-val {
  padding: 16px 24px;
  color: var(--platinum);
}

.spec-val .tag {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(168, 224, 0, 0.12);
  color: var(--fiber-green);
  font-size: 11px;
  letter-spacing: 0.1em;
  margin-right: 6px;
}

@media (max-width: 680px) {
  .spec-row { grid-template-columns: 1fr; }
  .spec-key { border-right: none; border-bottom: 1px solid var(--divider); }
}

/* ============================================================
   Two-col content
   ============================================================ */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: start;
}

.two-col aside .mono { display: block; margin-bottom: 16px; }

.two-col h2 { margin-bottom: 32px; }

.two-col .body p + p { margin-top: 20px; }

@media (max-width: 860px) {
  .two-col { grid-template-columns: 1fr; gap: 40px; }
}

/* ============================================================
   Contact / forms
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: start;
}

.contact-info .info-block {
  padding: 20px 0;
  border-bottom: 1px solid var(--divider);
}
.contact-info .info-block:first-child { padding-top: 0; }

.contact-info .mono { display: block; margin-bottom: 6px; font-size: 10px; }

.contact-info .info-value {
  font-size: 16px;
  color: var(--platinum);
  word-break: break-word;
}

.contact-info .info-value a { color: var(--platinum); }
.contact-info .info-value a:hover { color: var(--fiber-green); }

.form-field { margin-bottom: 24px; }

.form-field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--mute);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: 10px;
}

.form-field label .req { color: var(--fiber-green); }

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--graphite);
  border: 1px solid var(--divider);
  color: var(--platinum);
  font-family: var(--font-sans);
  font-size: 15px;
  transition: border-color 0.2s;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--fiber-green);
}

.form-field textarea {
  min-height: 140px;
  resize: vertical;
  font-family: var(--font-sans);
}

.form-field select {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23A8E000' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 44px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 680px) {
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
}

.form-status {
  margin-top: 16px;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: none;
}
.form-status.ok {
  display: block;
  border: 1px solid var(--fiber-green);
  color: var(--fiber-green);
  background: rgba(168, 224, 0, 0.06);
}
.form-status.err {
  display: block;
  border: 1px solid #ff5252;
  color: #ff7878;
  background: rgba(255, 82, 82, 0.06);
}

/* ============================================================
   CTA block
   ============================================================ */
.cta-block {
  border: 1px solid var(--divider);
  padding: clamp(40px, 6vw, 72px);
  background:
    radial-gradient(circle at 80% 0%, rgba(168, 224, 0, 0.08), transparent 50%),
    var(--graphite);
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  align-items: center;
}

.cta-block h2 { font-size: clamp(28px, 3.2vw, 40px); margin-bottom: 16px; }

@media (max-width: 860px) {
  .cta-block { grid-template-columns: 1fr; text-align: left; }
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  border-top: 1px solid var(--divider);
  padding: 72px 0 40px;
  background: var(--graphite);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}

.footer-logo { height: 36px; margin-bottom: 16px; }

.footer h5 {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mute);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: 20px;
  font-weight: 400;
}

.footer ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }

.footer ul a {
  color: var(--platinum);
  font-size: 14px;
  opacity: 0.8;
  transition: opacity 0.2s, color 0.2s;
}

.footer ul a:hover { color: var(--fiber-green); opacity: 1; text-decoration: none; }

.footer-bottom {
  border-top: 1px solid var(--divider);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mute);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-bottom span { color: var(--fiber-green); }

@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}

/* ============================================================
   Page header (sub-pages)
   ============================================================ */
.page-header {
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--divider);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(168, 224, 0, 0.06), transparent 60%);
  pointer-events: none;
}

.page-header h1 {
  font-size: clamp(40px, 5.5vw, 68px);
  margin-bottom: 20px;
}

.page-header p { font-size: clamp(16px, 1.5vw, 19px); color: var(--platinum); opacity: 0.8; max-width: 68ch; }

/* breadcrumb */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mute);
  letter-spacing: 0.15em;
  margin-bottom: 32px;
  text-transform: uppercase;
}
.breadcrumb a { color: var(--mute); }
.breadcrumb a:hover { color: var(--fiber-green); text-decoration: none; }
.breadcrumb span { margin: 0 8px; color: var(--mute-2); }
.breadcrumb .current { color: var(--fiber-green); }

/* reveal animation */
@keyframes reveal {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: none; }
}

.reveal { animation: reveal 0.8s ease-out both; }
.reveal-1 { animation-delay: 0.05s; }
.reveal-2 { animation-delay: 0.15s; }
.reveal-3 { animation-delay: 0.25s; }
.reveal-4 { animation-delay: 0.35s; }
.reveal-5 { animation-delay: 0.45s; }