/* ==========================================================================
   CENTRIDIAL INC. — corporate site
   Palette: Deep Graphite #1E1E24 · Emerald Route #00C853 · Signal Orange #FF6D00
   ========================================================================== */

:root {
  /* type scale */
  --text-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.84rem + 0.2vw, 0.9375rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.2vw, 2.125rem);
  --text-2xl: clamp(2rem, 1.3rem + 2.6vw, 3.25rem);

  /* spacing */
  --space-1: .25rem; --space-2: .5rem;  --space-3: .75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem;  --space-10: 2.5rem;
  --space-12: 3rem;  --space-16: 4rem;  --space-20: 5rem;  --space-24: 6rem;

  --radius: 14px;
  --radius-lg: 22px;
  --maxw: 1200px;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --brand: #00C853;        /* emerald route */
  --brand-fill: #00C853;   /* solid fills, buttons */
  --brand-deep: #007A33;
  --signal: #FF6D00;       /* signal orange */
}

/* ---------- dark (default, premium) ---------- */
:root, [data-theme="dark"] {
  --bg: #16161B;
  --bg-2: #1E1E24;
  --surface: #22222A;
  --surface-2: #282832;
  --border: #33333E;
  --border-soft: #2A2A33;
  --text: #F2F3F5;
  --text-muted: #A3A6AF;
  --text-faint: #71747E;
  --accent: #00C853;
  --accent-ink: #052012;
  --glow: 0 0 0 1px rgba(0, 200, 83, .35), 0 18px 50px -18px rgba(0, 200, 83, .45);
  --shadow: 0 24px 60px -30px rgba(0, 0, 0, .9);
  --grid-line: rgba(255, 255, 255, .035);
}

/* ---------- light ---------- */
[data-theme="light"] {
  --bg: #F6F7F8;
  --bg-2: #FFFFFF;
  --surface: #FFFFFF;
  --surface-2: #F1F3F4;
  --border: #DFE2E5;
  --border-soft: #E8EAEC;
  --text: #1E1E24;
  --text-muted: #5C606A;
  --text-faint: #8B8F98;
  --accent: #00913C;
  --accent-ink: #FFFFFF;
  --glow: 0 0 0 1px rgba(0, 145, 60, .28), 0 18px 40px -22px rgba(0, 145, 60, .35);
  --shadow: 0 20px 45px -28px rgba(30, 30, 36, .35);
  --grid-line: rgba(30, 30, 36, .05);
  /* text-safe variants of the corporate colours on light surfaces (WCAG AA) */
  --brand: #007A33;
  --brand-fill: #00C853;
  --brand-deep: #00602A;
  --signal: #B84E00;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: var(--text-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background .4s var(--ease), color .4s var(--ease);
}

h1, h2, h3, h4, .wordmark, .kpi-value, .step-n {
  font-family: 'Montserrat', 'Inter', sans-serif;
  letter-spacing: -.015em;
  line-height: 1.12;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
b, strong { font-weight: 600; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-ink); padding: var(--space-3) var(--space-4);
}
.skip:focus { left: var(--space-4); top: var(--space-4); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ============ buttons ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: 600; letter-spacing: .01em;
  padding: .7rem 1.3rem; border-radius: 10px; border: 1px solid transparent;
  transition: transform .25s var(--ease), background .25s var(--ease),
              box-shadow .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease);
  white-space: nowrap;
}
.btn-lg { padding: .95rem 1.7rem; font-size: var(--text-base); }
.btn-primary { background: var(--brand-fill); color: #04150A; box-shadow: 0 12px 30px -14px rgba(0, 200, 83, .8); }
.btn-primary:hover { background: #16D964; transform: translateY(-2px); box-shadow: 0 18px 40px -14px rgba(0, 200, 83, .95); }
.btn-ghost { border-color: var(--border); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-2px); }

/* ============ header ============ */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: var(--space-8);
  padding: var(--space-4) clamp(var(--space-4), 4vw, var(--space-12));
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--border-soft);
  transition: box-shadow .3s var(--ease), background .3s var(--ease);
}
.nav.scrolled { box-shadow: 0 12px 30px -22px rgba(0, 0, 0, .8); }

.brand { display: flex; align-items: center; gap: var(--space-3); }
.mark { width: 38px; height: 38px; flex: none; }
.wordmark {
  font-size: 1.0625rem; font-weight: 700; letter-spacing: .06em;
  color: var(--text); text-transform: none;
}
.wordmark b { font-weight: 700; color: var(--brand); }
.dot-i { position: relative; font-style: normal; }
.dot-i::after {
  content: ""; position: absolute; left: 50%; top: -.42em; translate: -50% 0;
  width: 5px; height: 5px; border-radius: 50%; background: var(--brand);
  box-shadow: 0 0 8px 2px color-mix(in srgb, var(--brand-fill) 70%, transparent);
  animation: blip 2.4s var(--ease) infinite;
}
@keyframes blip { 0%, 100% { opacity: 1 } 50% { opacity: .35 } }

.links { display: flex; gap: var(--space-6); margin-inline-start: auto; font-size: var(--text-sm); font-weight: 500; }
.links a { color: var(--text-muted); position: relative; padding-block: 4px; }
.links a::after {
  content: ""; position: absolute; inset-inline: 0; bottom: 0; height: 1.5px;
  background: var(--brand); scale: 0 1; transform-origin: left; transition: scale .3s var(--ease);
}
.links a:hover { color: var(--text); }
.links a:hover::after { scale: 1 1; }

.nav-actions { display: flex; align-items: center; gap: var(--space-3); }
.theme {
  width: 38px; height: 38px; display: grid; place-items: center; cursor: pointer;
  background: transparent; color: var(--text-muted);
  border: 1px solid var(--border); border-radius: 10px;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.theme:hover { color: var(--brand); border-color: var(--brand); }
.theme svg { width: 18px; height: 18px; }
[data-theme="dark"] .i-sun, [data-theme="light"] .i-moon { display: none; }

/* ============ hero ============ */
.hero {
  position: relative; isolation: isolate; overflow: hidden;
  padding: clamp(var(--space-16), 9vw, var(--space-24)) clamp(var(--space-4), 4vw, var(--space-12)) clamp(var(--space-16), 8vw, var(--space-24));
  background:
    radial-gradient(120% 90% at 78% 8%, rgba(0, 200, 83, .16), transparent 60%),
    radial-gradient(70% 60% at 8% 92%, rgba(255, 109, 0, .10), transparent 65%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
}
[data-theme="light"] .hero {
  background:
    radial-gradient(120% 90% at 78% 8%, rgba(0, 200, 83, .14), transparent 60%),
    radial-gradient(70% 60% at 8% 92%, rgba(255, 109, 0, .09), transparent 65%),
    linear-gradient(180deg, #FFFFFF, var(--bg));
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px),
                    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(100% 70% at 50% 30%, #000 40%, transparent 100%);
}
.routes { position: absolute; inset: 0; z-index: -1; opacity: .85; }
.routes svg { width: 100%; height: 100%; }
.fiber path {
  fill: none; stroke: color-mix(in srgb, var(--brand) 22%, transparent); stroke-width: 1.4;
}
.pulse path {
  fill: none; stroke: var(--brand); stroke-width: 2.4; stroke-linecap: round;
  stroke-dasharray: 90 1200; filter: drop-shadow(0 0 8px rgba(0, 200, 83, .85));
  animation: flow 9s linear infinite;
}
.pulse path:nth-child(2) { animation-duration: 11s; animation-delay: -3s; stroke: var(--signal); filter: drop-shadow(0 0 8px rgba(255, 109, 0, .7)); }
.pulse path:nth-child(3) { animation-duration: 13s; animation-delay: -6s; }
.pulse path:nth-child(4) { animation-duration: 15s; animation-delay: -9s; }
@keyframes flow { from { stroke-dashoffset: 1290 } to { stroke-dashoffset: 0 } }
.nodes circle { fill: var(--brand); opacity: .55; animation: blip 3.2s ease-in-out infinite; }
.nodes circle:nth-child(even) { animation-delay: -1.6s; fill: var(--signal); }

.hero-inner { position: relative; max-width: var(--maxw); margin-inline: auto; }
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 600; letter-spacing: .16em; text-transform: uppercase;
  color: var(--brand); background: color-mix(in srgb, var(--brand) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--brand) 30%, transparent);
  padding: .45rem .85rem; border-radius: 999px; margin-bottom: var(--space-6);
}
.live {
  width: 7px; height: 7px; border-radius: 50%; background: var(--brand); flex: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 22%, transparent);
  animation: blip 1.8s ease-in-out infinite;
}
.hero h1 { font-size: var(--text-2xl); font-weight: 800; max-width: 17ch; }
.grad {
  background: linear-gradient(100deg, var(--brand) 10%, #5CF29C 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede { margin-top: var(--space-6); max-width: 60ch; color: var(--text-muted); font-size: var(--text-lg); }
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-10); }

.hero-meta {
  list-style: none; display: flex; flex-wrap: wrap; gap: var(--space-10);
  margin-top: var(--space-16); padding-top: var(--space-6); border-top: 1px solid var(--border);
}
.hero-meta li { display: grid; gap: 2px; }
.hero-meta b { font-size: var(--text-base); font-weight: 600; }
.hero-meta span { font-size: var(--text-xs); color: var(--text-faint); text-transform: uppercase; letter-spacing: .12em; }

/* ============ kpis ============ */
.kpis {
  max-width: var(--maxw); margin: calc(-1 * var(--space-12)) auto 0;
  position: relative; z-index: 2;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1px;
  background: var(--border-soft); border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow);
  inline-size: calc(100% - 2 * clamp(var(--space-4), 4vw, var(--space-12)));
}
.kpi { background: var(--surface); padding: var(--space-6) var(--space-6) var(--space-5); display: grid; gap: var(--space-1); }
.kpi-label { font-size: var(--text-xs); letter-spacing: .14em; text-transform: uppercase; color: var(--text-faint); }
.kpi-value { font-size: var(--text-xl); font-weight: 700; color: var(--text); font-variant-numeric: tabular-nums; }
.kpi-note { font-size: var(--text-xs); color: var(--text-muted); }
.bar { height: 3px; border-radius: 99px; background: var(--surface-2); margin-top: var(--space-3); overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; border-radius: inherit; background: linear-gradient(90deg, var(--brand-deep), var(--brand)); transition: width 1.4s var(--ease); }
.kpi.in .bar i { width: var(--w); }

/* ============ sections ============ */
.section {
  max-width: var(--maxw); margin-inline: auto;
  padding: clamp(var(--space-16), 9vw, var(--space-24)) clamp(var(--space-4), 4vw, var(--space-12));
}
.section.alt { max-width: none; background: var(--bg-2); border-block: 1px solid var(--border-soft); }
.section.alt > * { max-width: var(--maxw); margin-inline: auto; }

.head { max-width: 62ch; margin-bottom: var(--space-12); }
.kicker {
  font-size: var(--text-xs); font-weight: 600; letter-spacing: .18em; text-transform: uppercase;
  color: var(--brand); margin-bottom: var(--space-3);
}
.head h2 { font-size: var(--text-xl); font-weight: 700; }
.sub { margin-top: var(--space-4); color: var(--text-muted); }

/* cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-6); }
.card {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: var(--space-8) var(--space-6);
  display: grid; gap: var(--space-4); align-content: start;
  transition: transform .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease);
}
.card::before {
  content: ""; position: absolute; inset-inline: var(--space-6); top: 0; height: 2px;
  background: linear-gradient(90deg, var(--brand), transparent);
  opacity: 0; transition: opacity .35s var(--ease);
}
.card:hover { transform: translateY(-6px); border-color: color-mix(in srgb, var(--brand) 45%, var(--border)); box-shadow: var(--glow), var(--shadow); }
.card:hover::before { opacity: 1; }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.ico { width: 30px; height: 30px; color: var(--brand); }
.pill {
  font-size: var(--text-xs); font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  padding: .3rem .65rem; border-radius: 999px; white-space: nowrap;
}
.pill-green { color: var(--brand); background: color-mix(in srgb, var(--brand) 13%, transparent); border: 1px solid color-mix(in srgb, var(--brand) 30%, transparent); }
.pill-orange { color: var(--signal); background: color-mix(in srgb, var(--signal) 13%, transparent); border: 1px solid color-mix(in srgb, var(--signal) 32%, transparent); }
.card h3 { font-size: var(--text-lg); font-weight: 700; }
.card p { color: var(--text-muted); font-size: var(--text-sm); }
.ticks { list-style: none; display: grid; gap: var(--space-2); font-size: var(--text-sm); }
.ticks li { position: relative; padding-inline-start: 1.4rem; color: var(--text); }
.ticks li::before {
  content: ""; position: absolute; left: 0; top: .55em; width: 9px; height: 5px;
  border-inline-start: 2px solid var(--brand); border-block-end: 2px solid var(--brand);
  rotate: -45deg;
}
.tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-2); }
.tags span {
  font-size: var(--text-xs); color: var(--text-muted);
  background: var(--surface-2); border: 1px solid var(--border-soft);
  padding: .3rem .6rem; border-radius: 8px;
}

/* rates table */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); }
.rates { width: 100%; border-collapse: collapse; min-width: 640px; font-size: var(--text-sm); }
.rates th {
  text-align: left; font-family: 'Montserrat', sans-serif; font-size: var(--text-xs);
  letter-spacing: .12em; text-transform: uppercase; color: var(--text);
  background: var(--surface-2); padding: var(--space-4) var(--space-5); border-bottom: 1px solid var(--border);
}
.rates td { padding: var(--space-4) var(--space-5); border-bottom: 1px solid var(--border-soft); color: var(--text-muted); }
.rates tbody tr { transition: background .25s var(--ease); }
.rates tbody tr:hover { background: color-mix(in srgb, var(--brand) 7%, transparent); }
.rates tbody tr:last-child td { border-bottom: 0; }
.rates td b { color: var(--text); }
.num { font-variant-numeric: tabular-nums; color: var(--brand) !important; font-weight: 600; }
.status { display: inline-flex; align-items: center; gap: .45rem; font-size: var(--text-xs); font-weight: 600; letter-spacing: .06em; text-transform: uppercase; }
.status::before { content: ""; width: 7px; height: 7px; border-radius: 50%; }
.status.ok { color: var(--brand); } .status.ok::before { background: var(--brand); box-shadow: 0 0 8px var(--brand); }
.status.warn { color: var(--signal); } .status.warn::before { background: var(--signal); box-shadow: 0 0 8px var(--signal); }
.fineprint { margin-top: var(--space-5); font-size: var(--text-xs); color: var(--text-faint); max-width: 70ch; }

/* split / why */
.split { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(var(--space-8), 5vw, var(--space-16)); align-items: center; }
.split-copy h2 { font-size: var(--text-xl); font-weight: 700; }
.compare { list-style: none; display: grid; gap: var(--space-3); margin: var(--space-8) 0; }
.compare li {
  display: grid; gap: 2px; padding: var(--space-4) var(--space-5);
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
  border-inline-start: 3px solid var(--border);
}
.compare li b { font-family: 'Montserrat', sans-serif; font-size: var(--text-sm); letter-spacing: .04em; }
.compare li span { font-size: var(--text-sm); color: var(--text-muted); }
.compare .good { border-inline-start-color: var(--brand); }
.compare .good b { color: var(--brand); }
.compare .bad { border-inline-start-color: var(--signal); }
.compare .bad b { color: var(--signal); }

.split-panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow); overflow: hidden;
}
.panel-head {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-4) var(--space-5); border-bottom: 1px solid var(--border-soft);
  font-size: var(--text-xs); letter-spacing: .14em; text-transform: uppercase; color: var(--text-faint);
  background: var(--surface-2);
}
.feed { list-style: none; }
.feed li {
  display: grid; grid-template-columns: 1fr auto auto; gap: var(--space-4); align-items: center;
  padding: var(--space-3) var(--space-5); border-bottom: 1px solid var(--border-soft);
  font-size: var(--text-sm);
}
.feed li:last-child { border-bottom: 0; }
.feed .dest { color: var(--text); }
.feed .metric { color: var(--text-muted); font-variant-numeric: tabular-nums; }
.feed .ok {
  font-size: var(--text-xs); font-weight: 600; text-transform: uppercase; letter-spacing: .1em;
  color: var(--brand); background: color-mix(in srgb, var(--brand) 12%, transparent);
  padding: .2rem .55rem; border-radius: 6px;
}

/* steps */
.steps { list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: var(--space-6); }
.steps li {
  position: relative; padding: var(--space-6); border-radius: var(--radius-lg);
  background: var(--surface); border: 1px solid var(--border); display: grid; gap: var(--space-2);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}
.steps li:hover { border-color: color-mix(in srgb, var(--brand) 40%, var(--border)); transform: translateY(-4px); }
.step-n { font-size: var(--text-lg); font-weight: 700; color: color-mix(in srgb, var(--brand) 75%, var(--text-faint)); }
.steps h3 { font-size: var(--text-base); font-weight: 700; }
.steps p { font-size: var(--text-sm); color: var(--text-muted); }

/* cta */
.cta {
  padding: clamp(var(--space-16), 9vw, var(--space-24)) clamp(var(--space-4), 4vw, var(--space-12));
  background:
    radial-gradient(90% 120% at 15% 0%, rgba(0, 200, 83, .18), transparent 60%),
    radial-gradient(70% 90% at 90% 100%, rgba(255, 109, 0, .12), transparent 60%),
    var(--bg-2);
  border-block: 1px solid var(--border-soft);
}
.cta-inner { max-width: 760px; margin-inline: auto; text-align: center; }
.cta h2 { font-size: var(--text-xl); font-weight: 700; }
.cta p { margin-top: var(--space-4); color: var(--text-muted); }
.cta-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: center; margin-top: var(--space-8); }
.cta-fine { font-size: var(--text-xs); color: var(--text-faint); margin-top: var(--space-6); }

/* footer */
footer { background: var(--bg-2); padding: clamp(var(--space-12), 6vw, var(--space-20)) clamp(var(--space-4), 4vw, var(--space-12)) var(--space-8); }
.foot-grid {
  max-width: var(--maxw); margin-inline: auto;
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: var(--space-10);
}
.foot-brand .brand { margin-bottom: var(--space-4); }
.foot-tag { color: var(--text-muted); font-size: var(--text-sm); max-width: 30ch; }
.seal { margin-top: var(--space-6); border-radius: 50%; }
[data-theme="dark"] .seal {
  background: rgba(255, 255, 255, .94);
  box-shadow: 0 0 0 1px var(--border), 0 18px 40px -22px rgba(0, 0, 0, .9);
}
.foot-col h4 {
  font-size: var(--text-xs); letter-spacing: .16em; text-transform: uppercase;
  color: var(--brand); margin-bottom: var(--space-4);
}
.foot-col p { font-size: var(--text-sm); color: var(--text-muted); margin-bottom: var(--space-2); }
.foot-col a:hover { color: var(--brand); }
.mono { font-variant-numeric: tabular-nums; letter-spacing: .02em; color: var(--text-faint) !important; }
.foot-bottom {
  max-width: var(--maxw); margin: var(--space-12) auto 0; padding-top: var(--space-6);
  border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: space-between;
  font-size: var(--text-xs); color: var(--text-faint);
}

/* reveal animation */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ============ responsive ============ */
@media (max-width: 1000px) {
  .split { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 820px) {
  .nav { flex-wrap: wrap; gap: var(--space-4); }
  .links { order: 3; width: 100%; margin-inline-start: 0; justify-content: space-between; gap: var(--space-3); overflow-x: auto; padding-bottom: 2px; }
  .nav-actions { margin-inline-start: auto; }
  .hero h1 { max-width: none; }
  .hero-meta { gap: var(--space-6); }
  .kpis { margin-top: var(--space-8); }
}
@media (max-width: 560px) {
  .foot-grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .btn { width: 100%; }
  .hero-cta, .cta-actions { flex-direction: column; align-items: stretch; }
  .links { font-size: var(--text-xs); }
}