/* =============================================================
   SOFTWARE DIGITAL SOLUTIONS LTD — Design System
   -------------------------------------------------------------
   A single-hue, engineering-led visual language.
   Deep navy canvas · one confident blue · type-led hierarchy.
   ============================================================= */

/* -------------------------------------------------------------
   1. Design Tokens
   ------------------------------------------------------------- */
:root {
  /* Palette */
  --bg: #0B1220;
  --surface: #111827;
  --surface-2: #151f31;
  --primary: #2563EB;
  --primary-hover: #1d4ed8;
  --accent: #60A5FA;
  --text: #F8FAFC;
  --muted: #94A3B8;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  /* Fluid type scale (min .. max between 360px and 1280px) */
  --step--1: clamp(0.83rem, 0.80rem + 0.15vw, 0.90rem);
  --step-0:  clamp(1.00rem, 0.95rem + 0.22vw, 1.13rem);
  --step-1:  clamp(1.20rem, 1.10rem + 0.45vw, 1.50rem);
  --step-2:  clamp(1.50rem, 1.30rem + 0.90vw, 2.10rem);
  --step-3:  clamp(1.90rem, 1.55rem + 1.55vw, 3.00rem);
  --step-4:  clamp(2.40rem, 1.80rem + 2.70vw, 4.20rem);
  --step-5:  clamp(2.90rem, 1.90rem + 4.40vw, 5.60rem);

  /* Spacing scale (8px base) */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --space-8: 8rem;

  /* Layout */
  --content-width: 1200px;
  --content-narrow: 780px;
  --gutter: clamp(1.25rem, 4vw, 3rem);

  /* Radii */
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;

  /* Type families */
  --font-display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;

  /* Motion */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.5s;

  /* Elevation */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow: 0 12px 40px -12px rgba(0, 0, 0, 0.6);
  --glow: 0 0 0 1px rgba(96, 165, 250, 0.25), 0 16px 50px -12px rgba(37, 99, 235, 0.55);
}

/* -------------------------------------------------------------
   2. Reset & Base
   ------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

* { margin: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

ul { list-style: none; padding: 0; }

button { font: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: rgba(37, 99, 235, 0.35);
  color: var(--text);
}

/* -------------------------------------------------------------
   3. Typography
   ------------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
}

h1 { font-size: var(--step-5); font-weight: 500; }
h2 { font-size: var(--step-4); }
h3 { font-size: var(--step-2); }
h4 { font-size: var(--step-1); }

p { color: var(--muted); }

.lead {
  font-size: var(--step-1);
  line-height: 1.55;
  color: var(--muted);
}

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.text-gradient {
  background: linear-gradient(120deg, var(--text) 30%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* -------------------------------------------------------------
   4. Layout Utilities
   ------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: var(--content-narrow); }

.section { padding-block: clamp(4rem, 9vw, 8rem); }
.section--tight { padding-block: clamp(3rem, 6vw, 5rem); }

.section-head { max-width: 60ch; margin-bottom: var(--space-5); }
.section-head p { margin-top: var(--space-2); }
.section-head--center {
  max-width: 62ch;
  margin-inline: auto;
  text-align: center;
}
.section-head--center .eyebrow { justify-content: center; }

.stack > * + * { margin-top: var(--space-2); }

.divider { height: 1px; background: var(--border); border: 0; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 1rem; top: -3rem;
  background: var(--primary); color: #fff;
  padding: 0.6rem 1rem; border-radius: var(--radius-sm);
  z-index: 200; transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 1rem; }

/* -------------------------------------------------------------
   5. Buttons
   ------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--step-0);
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              background var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
  will-change: transform;
}
.btn:hover { transform: translateY(-2px); }
.btn svg { width: 18px; height: 18px; }

.btn--primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 24px -10px rgba(37, 99, 235, 0.7);
}
.btn--primary:hover {
  background: var(--primary-hover);
  box-shadow: var(--glow);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn--ghost:hover {
  border-color: var(--accent);
  background: rgba(96, 165, 250, 0.06);
}

.btn--lg { padding: 1rem 1.8rem; }

.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-weight: 500;
}
.arrow-link svg { width: 16px; height: 16px; transition: transform var(--dur) var(--ease); }
.arrow-link:hover svg { transform: translateX(4px); }

/* -------------------------------------------------------------
   6. Header / Navigation
   ------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(11, 18, 32, 0.8);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom-color: var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}
.nav__menu {
  display: flex;
  align-items: center;
  gap: clamp(1.2rem, 2.6vw, 2.4rem);
}
.nav__link {
  position: relative;
  color: var(--muted);
  font-size: var(--step--1);
  font-weight: 500;
  padding: 0.4rem 0;
  transition: color var(--dur) var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1.5px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav__link:hover,
.nav__link[aria-current="page"] { color: var(--text); }
.nav__link:hover::after,
.nav__link[aria-current="page"]::after { transform: scaleX(1); }

.nav__actions { display: flex; align-items: center; gap: var(--space-2); }

.nav__toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  width: 44px; height: 44px;
  color: var(--text);
  align-items: center;
  justify-content: center;
}
.nav__toggle svg { width: 22px; height: 22px; }

/* -------------------------------------------------------------
   7. Logo
   ------------------------------------------------------------- */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.logo__mark {
  width: 34px; height: 34px;
  flex-shrink: 0;
}
.logo__text { display: flex; flex-direction: column; line-height: 1; }
.logo__name { font-size: 1.02rem; color: var(--text); }
.logo__sub {
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 3px;
}

/* -------------------------------------------------------------
   8. Cards
   ------------------------------------------------------------- */
.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  transition: transform var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 0%),
              rgba(96, 165, 250, 0.10), transparent 45%);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  background: var(--surface-2);
}
.card:hover::before { opacity: 1; }

.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: 12px;
  background: linear-gradient(150deg, rgba(37, 99, 235, 0.18), rgba(96, 165, 250, 0.06));
  border: 1px solid var(--border);
  color: var(--accent);
  margin-bottom: var(--space-3);
}
.card__icon svg { width: 26px; height: 26px; }
.card h3 { font-size: var(--step-1); margin-bottom: 0.5rem; }
.card p { font-size: var(--step-0); }

/* Grid presets */
.grid { display: grid; gap: var(--space-3); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* -------------------------------------------------------------
   9. Hero & decorative backgrounds
   ------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: clamp(4rem, 10vw, 8.5rem) clamp(4rem, 9vw, 7rem);
  overflow: hidden;
}
.hero__inner { position: relative; z-index: 2; max-width: 900px; }
.hero h1 { margin-block: var(--space-3) var(--space-4); }
.hero .lead { max-width: 60ch; }
.hero__actions {
  display: flex; flex-wrap: wrap; gap: var(--space-2);
  margin-top: var(--space-5);
}

/* Animated grid + floating gradients */
.bg-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
  opacity: 0.6;
}
.bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  z-index: 0;
  pointer-events: none;
}
.bg-blob--1 {
  width: 460px; height: 460px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.45), transparent 70%);
  top: -140px; left: -80px;
  animation: drift 22s var(--ease) infinite alternate;
}
.bg-blob--2 {
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(96, 165, 250, 0.30), transparent 70%);
  top: 40px; right: -60px;
  animation: drift 28s var(--ease) infinite alternate-reverse;
}
@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(40px, 50px, 0) scale(1.12); }
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(3.5rem, 8vw, 6.5rem) clamp(2.5rem, 5vw, 4rem);
}
.page-hero__inner { position: relative; z-index: 2; max-width: 760px; }
.page-hero h1 { font-size: var(--step-4); margin-block: var(--space-2) var(--space-3); }

/* -------------------------------------------------------------
   10. Stat / meta strips
   ------------------------------------------------------------- */
.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--step--1);
  color: var(--muted);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
  padding: 0.45rem 0.9rem;
  border-radius: 100px;
}
.chip svg { width: 15px; height: 15px; color: var(--accent); }

/* -------------------------------------------------------------
   11. Process / numbered steps
   ------------------------------------------------------------- */
.step {
  position: relative;
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.step:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.step__num {
  font-family: var(--font-display);
  font-size: var(--step-2);
  color: var(--primary);
  font-weight: 600;
  display: block;
  margin-bottom: var(--space-2);
}
.step h3 { font-size: var(--step-1); margin-bottom: 0.4rem; }

/* -------------------------------------------------------------
   12. Feature / split layout
   ------------------------------------------------------------- */
.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.split--reverse .split__media { order: -1; }

.feature-list { display: grid; gap: var(--space-3); margin-top: var(--space-4); }
.feature-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2);
  align-items: start;
}
.feature-list .tick {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px; height: 26px;
  border-radius: 7px;
  background: rgba(37, 99, 235, 0.14);
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 3px;
}
.feature-list .tick svg { width: 15px; height: 15px; }
.feature-list strong { color: var(--text); font-weight: 600; display: block; }
.feature-list span { color: var(--muted); font-size: var(--step-0); }

.media-frame {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--surface), var(--bg));
  padding: var(--space-3);
  box-shadow: var(--shadow);
}
.media-frame svg { width: 100%; height: auto; border-radius: var(--radius); }

/* -------------------------------------------------------------
   13. CTA band
   ------------------------------------------------------------- */
.cta {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(600px circle at 80% -20%, rgba(37, 99, 235, 0.35), transparent 60%),
    var(--surface);
  padding: clamp(2.5rem, 6vw, 4.5rem);
  text-align: center;
}
.cta h2 { font-size: var(--step-3); margin-bottom: var(--space-2); }
.cta p { max-width: 52ch; margin-inline: auto; }
.cta .hero__actions { justify-content: center; margin-top: var(--space-4); }

/* -------------------------------------------------------------
   14. Contact cards
   ------------------------------------------------------------- */
.contact-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.contact-card:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.contact-card__label { font-size: var(--step--1); color: var(--muted); letter-spacing: 0.04em; }
.contact-card__value {
  font-family: var(--font-display);
  font-size: var(--step-1);
  color: var(--text);
  word-break: break-word;
}
.contact-card .btn { margin-top: auto; align-self: flex-start; }

.info-table {
  display: grid;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.info-table__row {
  display: grid;
  grid-template-columns: minmax(140px, 30%) 1fr;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border);
}
.info-table__row:first-child { border-top: 0; }
.info-table__row dt { color: var(--muted); font-size: var(--step--1); letter-spacing: 0.03em; }
.info-table__row dd { color: var(--text); }

/* -------------------------------------------------------------
   15. Legal / prose
   ------------------------------------------------------------- */
.prose { max-width: 72ch; }
.prose h2 { font-size: var(--step-2); margin-top: var(--space-6); margin-bottom: var(--space-2); }
.prose h3 { font-size: var(--step-1); margin-top: var(--space-4); margin-bottom: var(--space-1); }
.prose p, .prose li { color: var(--muted); }
.prose p + p { margin-top: var(--space-2); }
.prose ul { margin-top: var(--space-2); display: grid; gap: 0.6rem; padding-left: 1.2rem; list-style: disc; }
.prose ul li::marker { color: var(--accent); }
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.prose strong { color: var(--text); }

/* -------------------------------------------------------------
   16. Footer
   ------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.015));
  padding-block: var(--space-6) var(--space-4);
  margin-top: var(--space-6);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-5);
  padding-bottom: var(--space-5);
}
.footer-brand p { margin-top: var(--space-3); font-size: var(--step--1); max-width: 40ch; }
.footer-col h4 {
  font-family: var(--font-body);
  font-size: var(--step--1);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--space-2);
}
.footer-col ul { display: grid; gap: 0.6rem; }
.footer-col a { color: var(--muted); font-size: var(--step-0); transition: color var(--dur) var(--ease); }
.footer-col a:hover { color: var(--text); }
.footer-legal {
  border-top: 1px solid var(--border);
  padding-top: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  font-size: var(--step--1);
  color: var(--muted);
}
.footer-legal .company-line { max-width: 65ch; }

/* -------------------------------------------------------------
   17. Scroll reveal
   ------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }
.reveal[data-delay="4"] { transition-delay: 0.32s; }

/* -------------------------------------------------------------
   18. Responsive
   ------------------------------------------------------------- */
@media (max-width: 960px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; }
  .split--reverse .split__media { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .nav__menu,
  .nav__actions .btn { display: none; }
  .nav__toggle { display: inline-flex; }

  /* Mobile menu panel */
  .nav__menu.is-open {
    display: flex;
    position: fixed;
    inset: 74px 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: rgba(11, 18, 32, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: var(--space-2) var(--gutter) var(--space-4);
    animation: menuIn 0.35s var(--ease);
  }
  .nav__menu.is-open .nav__link {
    width: 100%;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--border);
    font-size: var(--step-0);
  }
  .nav__menu.is-open .nav__link::after { display: none; }
  @keyframes menuIn {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: none; }
  }
}

@media (max-width: 560px) {
  .grid--4,
  .grid--3,
  .grid--2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .info-table__row { grid-template-columns: 1fr; gap: 0.3rem; }
  .hero__actions .btn { width: 100%; justify-content: center; }
}

@media (min-width: 1600px) {
  :root { --content-width: 1320px; }
}

/* -------------------------------------------------------------
   19. Reduced motion
   ------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}