/* ============================================================
   ITCLOUDNODE — SHARED DESIGN SYSTEM
   ============================================================ */

:root, [data-theme="light"] {
  --font-display: 'Cabinet Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.8rem);
  --text-3xl:  clamp(2.8rem,   1.2rem  + 4vw,    5.4rem);

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --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;

  --color-bg:             #f4f8ff;
  --color-surface:        rgba(255,255,255,0.82);
  --color-surface-2:      rgba(255,255,255,0.92);
  --color-surface-offset: rgba(225,236,255,0.72);
  --color-border:         rgba(16,35,73,0.12);
  --color-divider:        rgba(16,35,73,0.08);
  --color-text:           #07111f;
  --color-text-muted:     #50627d;
  --color-text-faint:     #7b8ca7;
  --color-text-inverse:   #f7fbff;

  --color-primary:        #2d7aff;
  --color-primary-hover:  #1e68e8;
  --color-cyan:           #00d4ff;
  --color-purple:         #9b59f7;
  --color-success:        #22c55e;
  --color-warning:        #ffb347;
  --color-error:          #ef4444;

  --radius-sm:   0.5rem;
  --radius-md:   0.9rem;
  --radius-lg:   1.2rem;
  --radius-xl:   1.6rem;
  --radius-full: 9999px;

  --shadow-sm: 0 10px 30px rgba(12,32,72,0.08);
  --shadow-md: 0 18px 50px rgba(12,32,72,0.14);
  --shadow-lg: 0 24px 80px rgba(12,32,72,0.16);

  --content: 1200px;
  --transition: 220ms cubic-bezier(0.16,1,0.3,1);

  --gradient: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  --gradient-text: linear-gradient(135deg, #2d7aff 0%, #00d4ff 45%, #9b59f7 100%);
  --bg-mesh:
    radial-gradient(circle at 15% 20%, rgba(45,122,255,.18), transparent 22%),
    radial-gradient(circle at 85% 18%, rgba(0,212,255,.14), transparent 20%),
    radial-gradient(circle at 60% 80%, rgba(155,89,247,.11), transparent 22%),
    linear-gradient(180deg, #eef5ff 0%, #f8fbff 100%);
}

[data-theme="dark"] {
  --color-bg:             #050b18;
  --color-surface:        rgba(10,18,35,0.68);
  --color-surface-2:      rgba(13,22,42,0.9);
  --color-surface-offset: rgba(18,28,50,0.82);
  --color-border:         rgba(171,206,255,0.12);
  --color-divider:        rgba(171,206,255,0.08);
  --color-text:           #ecf6ff;
  --color-text-muted:     #a7bdd8;
  --color-text-faint:     #6f88a8;
  --color-text-inverse:   #050b18;
  --color-primary:        #2d7aff;
  --color-primary-hover:  #4a8eff;
  --color-cyan:           #00d4ff;
  --color-purple:         #9b59f7;
  --shadow-sm: 0 10px 30px rgba(0,0,0,0.25);
  --shadow-md: 0 18px 50px rgba(0,0,0,0.35);
  --shadow-lg: 0 24px 80px rgba(0,0,0,0.45);
  --gradient-text: linear-gradient(135deg, #58a6ff 0%, #00d4ff 45%, #b67dff 100%);
  --bg-mesh:
    radial-gradient(circle at 15% 20%, rgba(45,122,255,.2), transparent 22%),
    radial-gradient(circle at 85% 18%, rgba(0,212,255,.12), transparent 20%),
    radial-gradient(circle at 60% 80%, rgba(155,89,247,.1), transparent 22%),
    linear-gradient(180deg, #050b18 0%, #081224 100%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg:             #050b18;
    --color-surface:        rgba(10,18,35,0.68);
    --color-surface-2:      rgba(13,22,42,0.9);
    --color-surface-offset: rgba(18,28,50,0.82);
    --color-border:         rgba(171,206,255,0.12);
    --color-divider:        rgba(171,206,255,0.08);
    --color-text:           #ecf6ff;
    --color-text-muted:     #a7bdd8;
    --color-text-faint:     #6f88a8;
    --color-text-inverse:   #050b18;
    --color-primary:        #2d7aff;
    --color-primary-hover:  #4a8eff;
    --color-cyan:           #00d4ff;
    --color-purple:         #9b59f7;
    --bg-mesh:
      radial-gradient(circle at 15% 20%, rgba(45,122,255,.2), transparent 22%),
      radial-gradient(circle at 85% 18%, rgba(0,212,255,.12), transparent 20%),
      radial-gradient(circle at 60% 80%, rgba(155,89,247,.1), transparent 22%),
      linear-gradient(180deg, #050b18 0%, #081224 100%);
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-padding-top: 90px;
}
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--bg-mesh);
  background-attachment: fixed;
  line-height: 1.65;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
button { border: none; background: none; cursor: pointer; }
ul { list-style: none; }
h1,h2,h3,h4,h5,h6 { text-wrap: balance; line-height: 1.12; }
p, li { text-wrap: pretty; max-width: 72ch; }

::selection { background: rgba(45,122,255,0.26); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-cyan); outline-offset: 3px; border-radius: var(--radius-md); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ── Layout ─────────────────────────────────── */
.container { width: min(calc(100% - 2rem), var(--content)); margin-inline: auto; }
.section { padding-block: clamp(var(--space-12), 8vw, var(--space-24)); content-visibility: auto; }

/* ── Glass ───────────────────────────────────── */
.glass {
  background: var(--color-surface);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

/* ── Typography ──────────────────────────────── */
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.section-head { display: grid; gap: var(--space-4); margin-bottom: var(--space-10); max-width: 740px; }
.section-head h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  line-height: 1.04;
  letter-spacing: -0.04em;
}
.section-head p { color: var(--color-text-muted); max-width: 64ch; }

/* ── Buttons ─────────────────────────────────── */
.btn {
  min-height: 48px;
  padding: 0.9rem 1.3rem;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  transition: transform var(--transition), background var(--transition),
              border-color var(--transition), box-shadow var(--transition), color var(--transition);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  color: white;
  background: var(--gradient);
  box-shadow: 0 12px 28px rgba(45,122,255,0.28);
}
.btn-secondary {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
.btn-ghost { color: var(--color-text-muted); }
.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: center; }

/* ── Skip link ───────────────────────────────── */
.skip-link {
  position: absolute; left: -9999px; top: var(--space-4); z-index: 200;
  background: var(--color-primary); color: white;
  padding: var(--space-3) var(--space-4); border-radius: var(--radius-full);
}
.skip-link:focus { left: var(--space-4); }

/* ── Navbar ──────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  background: color-mix(in srgb, var(--color-bg) 70%, transparent);
  border-bottom: 1px solid var(--color-divider);
  transition: background var(--transition);
}
.nav {
  min-height: 78px; display: flex; align-items: center;
  justify-content: space-between; gap: var(--space-4);
}
.brand {
  display: inline-flex; align-items: center; gap: 0.9rem;
  font-family: var(--font-display); font-weight: 800;
  letter-spacing: -0.03em; font-size: 1.1rem; white-space: nowrap;
}
.brand-mark {
  width: 42px; height: 42px; border-radius: 14px;
  display: grid; place-items: center; flex-shrink: 0;
  background: linear-gradient(145deg, rgba(45,122,255,.22), rgba(0,212,255,.1)),
              rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08);
}
.brand-mark svg { width: 22px; height: 22px; }
.nav-links {
  display: flex; align-items: center; gap: var(--space-6);
  color: var(--color-text-muted); font-size: var(--text-sm);
}
.nav-links a:hover { color: var(--color-text); }
.nav-links a.active { color: var(--color-text); font-weight: 600; }
.nav-actions { display: flex; align-items: center; gap: var(--space-3); }
.theme-toggle, .menu-toggle {
  width: 48px; height: 48px; border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface); display: grid; place-items: center;
}
.menu-toggle { display: none; }

/* ── Footer ──────────────────────────────────── */
.footer {
  padding: var(--space-8); border-radius: 24px;
  background: var(--color-surface); border: 1px solid var(--color-border);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
}
.footer-grid {
  display: grid; grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: var(--space-8);
}
.footer-col { display: grid; gap: var(--space-3); align-content: start; }
.footer-col h4 { font-family: var(--font-display); font-size: 1.05rem; letter-spacing: -0.02em; }
.footer-col p, .footer-col a { color: var(--color-text-muted); font-size: var(--text-sm); }
.footer-col a:hover { color: var(--color-text); }
.socials { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-2); }
.socials a {
  width: 44px; height: 44px; border-radius: 14px;
  display: grid; place-items: center;
  border: 1px solid var(--color-border);
  background: rgba(255,255,255,0.03);
  color: var(--color-text-muted);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.socials a:hover { color: var(--color-text); border-color: var(--color-primary); background: rgba(45,122,255,0.08); }
.footer-bottom {
  padding-top: var(--space-6); margin-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  display: flex; flex-wrap: wrap;
  justify-content: space-between; gap: var(--space-4);
  color: var(--color-text-muted); font-size: var(--text-sm);
}

/* ── Reveal ──────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(24px); }

/* ── Responsive ──────────────────────────────── */
@media (max-width: 860px) {
  .nav-links {
    position: absolute; top: calc(100% + 0.6rem); left: 1rem; right: 1rem;
    padding: var(--space-5); border-radius: 22px;
    background: var(--color-surface-2); border: 1px solid var(--color-border);
    backdrop-filter: blur(22px); -webkit-backdrop-filter: blur(22px);
    flex-direction: column; align-items: flex-start; display: none; z-index: 100;
  }
  .nav-links.open { display: flex; }
  .menu-toggle { display: grid; }
  .nav .btn-secondary { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .btn-row { align-items: stretch; }
  .btn-row .btn { width: 100%; }
}