/* =====================================================================
   CYPHERNULLBYTE | Security & Compliance Services
   ===================================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=IBM+Plex+Mono:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');

/* --------------------------- design tokens --------------------------- */

:root {
      --bg: #0a0a0b;
      --bg-raised: #111214;
      --bg-card: #131417;
      --bg-card-hover: #16181c;
      --border: rgba(255, 255, 255, 0.09);
      --border-strong: rgba(255, 255, 255, 0.18);
      --text: #ececee;
      --text-dim: #9a9ba1;
      --text-faint: #67686d;
      --accent: #2fe0c4;
      --accent-soft: rgba(47, 224, 196, 0.12);
      --accent-text: #0a0a0b;
      --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
      --radius: 3px;
      --max: 1140px;
      --font-sans: "IBM Plex Sans", ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
      color-scheme: dark;
}

:root[data-theme="light"] {
      --bg: #fafaf9;
      --bg-raised: #ffffff;
      --bg-card: #ffffff;
      --bg-card-hover: #f3f4f4;
      --border: rgba(10, 10, 11, 0.1);
      --border-strong: rgba(10, 10, 11, 0.2);
      --text: #131417;
      --text-dim: #55575d;
      --text-faint: #86888e;
      --accent: #0c8f7c;
      --accent-soft: rgba(12, 143, 124, 0.1);
      --accent-text: #ffffff;
      --shadow: 0 20px 50px rgba(20, 20, 20, 0.08);
      color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
      margin: 0;
      background: var(--bg);
      color: var(--text);
      font-family: var(--font-sans);
      font-weight: 400;
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      transition: background-color 0.35s ease, color 0.35s ease;
}

::selection { background: var(--accent); color: var(--accent-text); }

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

.wrap {
      max-width: var(--max);
      margin: 0 auto;
      padding: 0 28px;
}

.eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-mono);
      font-size: 12px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 18px;
}

.eyebrow::before {
      content: "";
      width: 22px;
      height: 1px;
      background: var(--accent);
}

h1, h2, h3, h4 { font-weight: 500; letter-spacing: -0.01em; margin: 0; }

.reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity 0.7s cubic-bezier(.2,.65,.3,1), transform 0.7s cubic-bezier(.2,.65,.3,1);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ------------------------------- nav ---------------------------------- */

.nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      border-bottom: 1px solid var(--border);
}

/* blur lives on a pseudo-element, not on .nav itself. backdrop-filter on
   .nav would make it a containing block for its position:fixed descendants
   (the mobile menu), collapsing that full-screen drawer down to .nav's own
   68px height. */
.nav::before {
      content: "";
      position: absolute;
      inset: 0;
      z-index: -1;
      background: color-mix(in srgb, var(--bg) 78%, transparent);
      backdrop-filter: blur(14px) saturate(140%);
      -webkit-backdrop-filter: blur(14px) saturate(140%);
}

.nav__inner {
      max-width: var(--max);
      margin: 0 auto;
      padding: 0 28px;
      height: 68px;
      display: flex;
      align-items: center;
      justify-content: space-between;
}

.nav__brand {
      font-family: var(--font-mono);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.02em;
}

.nav__brand span { color: var(--accent); }

.nav__links {
      display: flex;
      gap: 34px;
      list-style: none;
      margin: 0;
      padding: 0;
}

.nav__links a {
      font-size: 13px;
      color: var(--text-dim);
      letter-spacing: 0.02em;
      transition: color 0.2s ease;
      position: relative;
}

.nav__links a:hover { color: var(--text); }

.nav__right {
      display: flex;
      align-items: center;
      gap: 18px;
}

.btn-brochure {
      font-size: 12px;
      letter-spacing: 0.04em;
      color: var(--text);
      border: 1px solid var(--border-strong);
      padding: 9px 16px;
      border-radius: var(--radius);
      transition: border-color 0.2s ease, background 0.2s ease;
      white-space: nowrap;
}

.btn-brochure:hover { border-color: var(--accent); background: var(--accent-soft); }

.theme-toggle {
      width: 36px;
      height: 36px;
      display: grid;
      place-items: center;
      border: 1px solid var(--border-strong);
      border-radius: var(--radius);
      background: transparent;
      color: var(--text);
      cursor: pointer;
      transition: border-color 0.2s ease, background 0.2s ease;
}

.theme-toggle:hover { border-color: var(--accent); background: var(--accent-soft); }
.theme-toggle svg { width: 16px; height: 16px; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

.nav-burger {
      display: none;
      width: 36px;
      height: 36px;
      border: 1px solid var(--border-strong);
      border-radius: var(--radius);
      background: transparent;
      color: var(--text);
      cursor: pointer;
      align-items: center;
      justify-content: center;
      flex-direction: column;
      gap: 4px;
}
.nav-burger span { width: 16px; height: 1px; background: currentColor; display: block; }

/* ------------------------------- hero ---------------------------------- */

.hero {
      padding: 200px 0 120px;
      position: relative;
      overflow: hidden;
}

.hero::before {
      content: "";
      position: absolute;
      top: -200px;
      right: -160px;
      width: 560px;
      height: 560px;
      border-radius: 50%;
      background: radial-gradient(circle at center, var(--accent-soft), transparent 70%);
      pointer-events: none;
}

.hero__kicker {
      font-family: var(--font-mono);
      font-size: 13px;
      color: var(--text-faint);
      letter-spacing: 0.02em;
      margin-bottom: 22px;
}

.hero__kicker strong { color: var(--accent); font-weight: 600; }

.hero h1 {
      font-size: clamp(34px, 5.4vw, 60px);
      line-height: 1.12;
      max-width: 15ch;
      color: var(--text);
}

.hero__lede {
      margin-top: 26px;
      max-width: 640px;
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-dim);
}

.hero__tags {
      margin-top: 30px;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      font-size: 12px;
      color: var(--text-faint);
}

.hero__tags span {
      font-family: var(--font-mono);
      border: 1px solid var(--border);
      padding: 6px 12px;
      border-radius: var(--radius);
}

.hero__cta {
      margin-top: 44px;
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
}

.btn {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-family: inherit;
      font-size: 13px;
      letter-spacing: 0.03em;
      padding: 14px 24px;
      border-radius: var(--radius);
      cursor: pointer;
      transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, box-shadow .2s ease;
      border: 1px solid transparent;
}

.btn-primary {
      background: var(--accent);
      color: var(--accent-text);
      font-weight: 600;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px var(--accent-soft); }

.btn-ghost {
      border-color: var(--border-strong);
      color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); background: var(--accent-soft); transform: translateY(-2px); }

.hero__note { margin-top: 16px; font-size: 12px; color: var(--text-faint); }

/* ------------------------------ sections -------------------------------- */

.section { padding: 108px 0; border-top: 1px solid var(--border); }
.section--tight { padding: 96px 0; }

.section__head { max-width: 720px; margin-bottom: 56px; }

.section__head--row {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 24px;
      flex-wrap: wrap;
}

.btn-expand-all {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      flex: 0 0 auto;
      font-family: var(--font-mono);
      font-size: 12px;
      letter-spacing: 0.03em;
      color: var(--text);
      background: none;
      border: 1px solid var(--border-strong);
      border-radius: var(--radius);
      padding: 9px 16px;
      cursor: pointer;
      transition: border-color 0.2s ease, background 0.2s ease;
      white-space: nowrap;
}

.btn-expand-all:hover { border-color: var(--accent); background: var(--accent-soft); }

.btn-expand-all .chev {
      width: 12px;
      height: 12px;
      transition: transform 0.25s ease;
}

.btn-expand-all[aria-expanded="true"] .chev { transform: rotate(180deg); }
.btn-expand-all .label-collapse { display: none; }
.btn-expand-all[aria-expanded="true"] .label-expand { display: none; }
.btn-expand-all[aria-expanded="true"] .label-collapse { display: inline; }

.section__title { font-size: clamp(24px, 3.2vw, 34px); color: var(--text); }

.section__lead {
      margin-top: 16px;
      font-size: 15px;
      color: var(--text-dim);
      line-height: 1.85;
}

/* -------------------------------- about ---------------------------------- */

.about-grid {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 64px;
      align-items: start;
}

.about-copy p { font-size: 15px; color: var(--text-dim); line-height: 1.85; margin: 0 0 20px; }
.about-copy strong { color: var(--text); font-weight: 600; }

.proof-list {
      list-style: none;
      margin: 0 0 34px;
      padding: 0;
      display: flex;
      flex-direction: column;
      gap: 18px;
}

.proof-list li {
      position: relative;
      padding-left: 24px;
      font-size: 14px;
      color: var(--text-dim);
      line-height: 1.7;
}

.proof-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 9px;
      width: 8px;
      height: 1px;
      background: var(--accent);
}

.who-box {
      border: 1px solid var(--border);
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 30px;
}

.who-box h3 {
      font-family: var(--font-mono);
      font-size: 13px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 16px;
}

.who-box p { font-size: 14px; color: var(--text-dim); line-height: 1.85; margin: 0; }

/* --------------------------- engagement models --------------------------- */

.engagement-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 26px;
}

.engagement-card {
      border: 1px solid var(--border);
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 36px;
      display: flex;
      flex-direction: column;
      transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
}

.engagement-card:hover {
      border-color: var(--border-strong);
      background: var(--bg-card-hover);
      transform: translateY(-4px);
}

.engagement-card__num {
      font-family: var(--font-mono);
      font-size: 12px;
      color: var(--accent);
      letter-spacing: 0.08em;
      margin-bottom: 18px;
}

.engagement-card h3 { font-size: 21px; color: var(--text); margin-bottom: 8px; }

.engagement-card__for {
      font-size: 13px;
      color: var(--text-faint);
      font-style: italic;
      margin-bottom: 20px;
}

.engagement-card__fit {
      font-size: 13px;
      color: var(--text-dim);
      line-height: 1.75;
      margin-bottom: 24px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border);
}

.engagement-card__fit b { color: var(--text); font-weight: 600; }

.feature-list {
      list-style: none;
      margin: 0;
      padding: 0;
      display: flex;
      flex-direction: column;
      gap: 16px;
      flex: 1;
}

.feature-list li {
      font-size: 13.5px;
      color: var(--text-dim);
      line-height: 1.7;
      padding-left: 20px;
      position: relative;
}

.feature-list li::before {
      content: "›";
      position: absolute;
      left: 0;
      top: 0;
      color: var(--accent);
      font-weight: 700;
}

.feature-list li b { color: var(--text); font-weight: 600; }

.section__foot-note {
      margin-top: 34px;
      font-size: 12.5px;
      color: var(--text-faint);
      text-align: center;
}

/* ------------------------------ service menu ------------------------------ */

.services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 26px;
}

.service-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 32px;
      transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.service-card:hover { background: var(--bg-card-hover); border-color: var(--border-strong); transform: translateY(-4px); }

.service-card__head {
      display: flex;
      align-items: baseline;
      gap: 14px;
      margin-bottom: 16px;
}

.service-card__num {
      font-family: var(--font-mono);
      font-size: 12px;
      color: var(--accent);
      font-weight: 600;
}

.service-card h3 { font-size: 16px; color: var(--text); }

.service-card__highlight {
      font-size: 13.5px;
      color: var(--text-dim);
      line-height: 1.6;
      margin: 0 0 18px;
}

.service-card__toggle {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-family: var(--font-mono);
      font-size: 11.5px;
      letter-spacing: 0.04em;
      color: var(--accent);
      background: none;
      border: none;
      padding: 0;
      cursor: pointer;
}

.service-card__toggle .chev {
      width: 11px;
      height: 11px;
      transition: transform 0.25s ease;
}

.service-card__toggle[aria-expanded="true"] .chev { transform: rotate(180deg); }
.service-card__toggle .label-less { display: none; }
.service-card__toggle[aria-expanded="true"] .label-more { display: none; }
.service-card__toggle[aria-expanded="true"] .label-less { display: inline; }

.service-card__details {
      display: grid;
      grid-template-rows: 0fr;
      transition: grid-template-rows 0.3s ease;
}

.service-card__details.is-open { grid-template-rows: 1fr; }

.service-card__details-inner { overflow: hidden; }

.service-card ul {
      list-style: none;
      margin: 0;
      padding: 14px 0 0;
      display: flex;
      flex-direction: column;
      gap: 11px;
}

.service-card li {
      font-size: 13px;
      color: var(--text-dim);
      line-height: 1.65;
      padding-left: 16px;
      position: relative;
}

.service-card li::before {
      content: "–";
      position: absolute;
      left: 0;
      color: var(--text-faint);
}

.service-card li b { color: var(--text); font-weight: 600; }

.service-card--more {
      grid-column: 1 / -1;
      display: flex;
      align-items: center;
      gap: 28px;
      border-style: dashed;
      border-color: var(--border-strong);
      background: var(--accent-soft);
}

.service-card--more:hover {
      border-color: var(--accent);
      background: var(--accent-soft);
}

.service-card--more__mark {
      flex: 0 0 auto;
      width: 40px;
      height: 40px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      border: 1px solid var(--accent);
      color: var(--accent);
      font-size: 20px;
      font-weight: 600;
      transition: transform 0.25s ease;
}

.service-card--more:hover .service-card--more__mark { transform: rotate(90deg); }

.service-card--more__body { flex: 1; min-width: 0; }

.service-card--more h3 { margin-bottom: 6px; }

.service-card--more p {
      font-size: 13.5px;
      color: var(--text-dim);
      line-height: 1.75;
      margin: 0;
}

.service-card--more__cta { flex: 0 0 auto; padding: 11px 20px; font-size: 12.5px; white-space: nowrap; }

@media (max-width: 640px) {
      .service-card--more { flex-direction: column; align-items: flex-start; gap: 18px; }
      .service-card--more__cta { align-self: flex-start; }
}

.service-card__also {
      display: inline-block;
      margin-top: 18px;
      font-size: 11px;
      letter-spacing: 0.04em;
      color: var(--text-faint);
      border-top: 1px solid var(--border);
      padding-top: 14px;
      width: 100%;
}

/* -------------------------------- start ----------------------------------- */

.start-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 64px;
}

.route-list { list-style: none; margin: 0; padding: 0; counter-reset: route; }

.route-list li {
      counter-increment: route;
      position: relative;
      padding: 20px 0 20px 44px;
      border-top: 1px solid var(--border);
      font-size: 14px;
      color: var(--text-dim);
      line-height: 1.7;
}

.route-list li:last-child { border-bottom: 1px solid var(--border); }

.route-list li::before {
      content: counter(route, decimal-leading-zero);
      position: absolute;
      left: 0;
      top: 20px;
      font-family: var(--font-mono);
      font-size: 12px;
      color: var(--accent);
      font-weight: 600;
}

.route-list li b { color: var(--text); font-weight: 600; }

.includes-box {
      border: 1px solid var(--border);
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 32px;
      height: fit-content;
}

.includes-box h3 {
      font-family: var(--font-mono);
      font-size: 13px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 20px;
}

.includes-box ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 16px; }

.includes-box li { font-size: 13.5px; color: var(--text-dim); line-height: 1.7; padding-left: 20px; position: relative; }
.includes-box li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--accent); }
.includes-box li b { color: var(--text); font-weight: 600; }

/* -------------------------------- cta strip -------------------------------- */

.cta-strip {
      border-top: 1px solid var(--border);
      padding: 100px 0;
      text-align: center;
}

.cta-strip h2 {
      font-size: clamp(26px, 4vw, 40px);
      color: var(--text);
      max-width: 18ch;
      margin: 0 auto 20px;
}

.cta-strip p { font-size: 15px; color: var(--text-dim); max-width: 50ch; margin: 0 auto 40px; line-height: 1.8; }

.cta-strip .hero__cta { justify-content: center; }

/* --------------------------------- footer ----------------------------------- */

.site-footer {
      border-top: 1px solid var(--border);
      padding: 60px 0 30px;
}

.footer-grid {
      display: grid;
      grid-template-columns: 1.3fr 1fr 1fr;
      gap: 40px;
      padding-bottom: 44px;
}

.footer-brand { font-family: var(--font-mono); font-size: 15px; font-weight: 600; margin-bottom: 14px; }
.footer-brand span { color: var(--accent); }

.footer-col p, .footer-col a { font-size: 13px; color: var(--text-dim); line-height: 1.8; }

.footer-col h4 {
      font-family: var(--font-mono);
      font-size: 11px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--text-faint);
      margin-bottom: 16px;
      font-weight: 600;
}

.footer-email {
      font-size: 15px;
      color: var(--text);
      font-weight: 600;
      transition: color 0.2s ease;
}
.footer-email:hover { color: var(--accent); }

.footer-col a.footer-link {
      display: block;
      color: var(--text-dim);
      margin-bottom: 10px;
      transition: color 0.2s ease;
}
.footer-col a.footer-link:hover { color: var(--accent); }

.footer-bottom {
      border-top: 1px solid var(--border);
      padding-top: 26px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      flex-wrap: wrap;
}

.footer-bottom__copy { font-size: 12px; color: var(--text-faint); }

.footer-bottom__tag {
      font-size: 12px;
      color: var(--text-dim);
      letter-spacing: 0.03em;
}

.footer-bottom__tag strong { color: var(--accent); font-weight: 600; }

/* -------------------------------- responsive -------------------------------- */

@media (max-width: 900px) {
      .about-grid, .engagement-grid, .start-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 760px) {
      .nav__links { position: fixed; top: 68px; left: 0; right: 0; bottom: 0; width: 100%; height: calc(100dvh - 68px); margin: 0; background: var(--bg); flex-direction: column; padding: 30px 28px; gap: 26px; transform: translateX(100%); transition: transform 0.3s ease; overflow-y: auto; z-index: 99; }
      .nav__links.is-open { transform: translateX(0); }
      .nav__links a { font-size: 16px; }
      .nav-burger { display: flex; }
      .hero { padding: 150px 0 90px; }
      .section { padding: 80px 0; }
      .btn-brochure { display: none; }
}

@media (max-width: 480px) {
      .wrap { padding: 0 20px; }
      .engagement-card, .who-box, .includes-box, .service-card { padding: 24px; }
      .footer-bottom { flex-direction: column; align-items: flex-start; }
}