/* Root variables */
:root {
  --color-bg: #001a33;
  --color-bg-alt: #00224a;
  --color-primary: #003366; /* core deep blue */
  --color-accent: #0a84ff;
  --color-text: #e6eef5;
  --color-text-soft: #bfd0e0;
  --color-surface: #0d2b4a;
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 20px;
  --gradient-accent: linear-gradient(135deg, #003366 0%, #00539b 60%, #0a84ff 100%);
  --font-heading: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --max-width: 1140px;
  --easing: cubic-bezier(.4,.2,.2,1);
  --shadow-sm: 0 4px 12px -2px rgba(0,0,0,0.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; font-family: var(--font-body); background: radial-gradient(circle at 20% 20%, #04284a 0%, #001a33 60%) fixed; color: var(--color-text); -webkit-font-smoothing: antialiased;
}

/* Light theme overrides */
[data-theme="light"] {
  --color-bg: #f5f8fb;
  --color-bg-alt: #ffffff;
  --color-primary: #003366;
  --color-accent: #0a5cc4;
  --color-text: #173042;
  --color-text-soft: #4a6a82;
  --color-surface: #ffffff;
  --gradient-accent: linear-gradient(135deg, #0a5cc4 0%, #0a84ff 70%, #5fb8ff 100%);
}

[data-theme="light"] body, [data-theme="light"] .hero { background: #f5f8fb; }
[data-theme="light"] .site-header { background: rgba(255,255,255,0.85); border-bottom-color: rgba(0,0,0,0.05); }
[data-theme="light"] .card, [data-theme="light"] .evo-block, [data-theme="light"] .approach-steps li { background: #ffffff; border-color: rgba(0,0,0,0.07); }
[data-theme="light"] .alt-bg { background: linear-gradient(145deg, rgba(0,0,0,0.03), rgba(0,0,0,0.01)); }
[data-theme="light"] .site-footer { background:#eef3f7; color:#4a6a82; border-top-color: rgba(0,0,0,0.08); }
[data-theme="light"] .footer-links a { color:#4a6a82; }
[data-theme="light"] .logo-sub { color:#4a6a82; }

/* Theme toggle */
.theme-toggle { margin-left:1rem; background: rgba(255,255,255,0.08); border:1px solid rgba(255,255,255,0.25); color:var(--color-text); padding:.55rem .75rem; border-radius: var(--radius-sm); cursor:pointer; font-size:.9rem; line-height:1; display:inline-flex; align-items:center; justify-content:center; transition: background .3s var(--easing), color .3s var(--easing); }
.theme-toggle:hover { background: rgba(255,255,255,0.15); }
[data-theme="light"] .theme-toggle { background: rgba(0,0,0,0.05); border-color: rgba(0,0,0,0.15); }
[data-theme="light"] .theme-toggle:hover { background: rgba(0,0,0,0.1); }

img { max-width: 100%; height: auto; }
a { color: var(--color-accent); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.flex { display: flex; }
.align-center { align-items: center; }
.between { justify-content: space-between; }

/* Header */
.site-header { position: sticky; top:0; z-index:100; background: rgba(0,20,40,0.75); backdrop-filter: blur(10px); border-bottom: 1px solid rgba(255,255,255,0.06); }
.logo a { font-family: var(--font-heading); font-weight:700; font-size:1.4rem; letter-spacing:1px; display:inline-flex; align-items:center; }
.logo-mark { background: var(--gradient-accent); -webkit-background-clip:text; background-clip:text; color: transparent; }
.logo-sub { color: var(--color-text-soft); margin-left:2px; }

.main-nav { position: relative; }
.nav-toggle { display:none; background:none; border:1px solid rgba(255,255,255,.2); color:var(--color-text); padding:.5rem .75rem; border-radius: var(--radius-sm); font-size:1rem; cursor:pointer; }
.nav-menu { list-style:none; margin:0; padding:0; display:flex; gap:2rem; }
.nav-menu a { font-weight:500; font-size:.95rem; color:var(--color-text-soft); }
.nav-menu a:hover { color:var(--color-text); }

/* Hero */
.hero { position: relative; padding: clamp(4rem, 14vh, 10rem) 0 5rem; overflow:hidden; }
.hero h1 { font-family: var(--font-heading); font-size: clamp(2.4rem, 6vw, 4rem); line-height:1.05; margin:0 0 1rem; letter-spacing:-1px; }
.hero .tagline { font-size:1.15rem; font-weight:600; margin:0 0 1rem; color: var(--color-text-soft); }
.hero .lead { max-width: 640px; font-size:1.05rem; line-height:1.5; }
.hero-ctas { margin-top:2rem; display:flex; gap:1rem; flex-wrap:wrap; }
.logic-grid { position:absolute; inset:0; background-image: radial-gradient(circle at 10% 15%, rgba(255,255,255,0.08) 0, transparent 60%), repeating-linear-gradient(60deg, rgba(255,255,255,0.04) 0 2px, transparent 2px 40px), repeating-linear-gradient(-60deg, rgba(255,255,255,0.03) 0 2px, transparent 2px 50px); mix-blend-mode: overlay; opacity:.5; pointer-events:none; animation: drift 30s linear infinite; }
@keyframes drift { to { transform: translate3d(50px, 0,0); } }

/* Sections */
.section { padding:4.5rem 0; position:relative; }
.alt-bg { background: linear-gradient(145deg, rgba(255,255,255,0.02), rgba(255,255,255,0.005)); }
.section-title { font-family: var(--font-heading); font-size: clamp(1.9rem, 4.5vw, 2.6rem); margin:0 0 2.5rem; position:relative; }
.section-title:after { content:""; display:block; width:60px; height:3px; background: var(--gradient-accent); margin-top:.75rem; border-radius:3px; }

.cards { display:grid; gap:2rem; }
.cards.three { grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); }
.card { background: rgba(255,255,255,0.04); padding:1.75rem 1.5rem 1.9rem; border:1px solid rgba(255,255,255,0.07); border-radius: var(--radius-md); position:relative; overflow:hidden; backdrop-filter: blur(4px); }
.card:before { content:""; position:absolute; inset:0; background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.15), transparent 60%); opacity:0; transition: opacity .6s var(--easing); }
.card:hover:before { opacity:1; }
.card h3 { margin-top:0; font-family: var(--font-heading); font-size:1.15rem; letter-spacing:.5px; }
.card p { margin-bottom:0; font-size:.95rem; line-height:1.45; }

/* Approach */
.approach-steps { counter-reset: step; list-style:none; margin:0; padding:0; display:grid; gap:1.25rem; }
.approach-steps li { background: rgba(255,255,255,0.03); border:1px solid rgba(255,255,255,0.06); padding:1rem 1.1rem 1rem 3.25rem; border-radius: var(--radius-md); position:relative; font-size:.95rem; line-height:1.4; }
.approach-steps li:before { counter-increment: step; content: counter(step); position:absolute; left:1rem; top:50%; transform:translateY(-50%); width:1.9rem; height:1.9rem; display:grid; place-items:center; background: var(--gradient-accent); font-weight:600; font-size:.85rem; border-radius:50%; }

/* Evolution */
.evolution-grid { display:grid; gap:1.75rem; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); }
.evo-block { border:1px solid rgba(255,255,255,0.08); padding:1.5rem 1.3rem 1.6rem; border-radius: var(--radius-md); background: rgba(255,255,255,0.035); position:relative; }
.evo-block.future { opacity:.85; }
.evo-block h3 { margin-top:0; font-family: var(--font-heading); font-size:1.05rem; letter-spacing:.5px; }
.evo-block p { margin:0; font-size:.92rem; line-height:1.4; }

/* Contact */
.contact-form { display:grid; gap:1.25rem; margin-top:1.5rem; }
.form-row { display:flex; flex-direction:column; gap:.4rem; }
label { font-size:.75rem; letter-spacing:1px; text-transform:uppercase; font-weight:600; color: var(--color-text-soft); }
input, textarea { background: rgba(255,255,255,0.06); border:1px solid rgba(255,255,255,0.15); color:var(--color-text); padding:.85rem 1rem; border-radius: var(--radius-sm); font: inherit; resize: vertical; }
input:focus, textarea:focus { outline:2px solid var(--color-accent); outline-offset:1px; }
.form-note { font-size:.7rem; opacity:.65; margin-top:.25rem; }

/* Buttons */
.btn { --btn-bg: rgba(255,255,255,0.08); --btn-border: rgba(255,255,255,0.2); display:inline-block; padding:.85rem 1.25rem; border-radius: var(--radius-sm); font-weight:600; font-size:.85rem; letter-spacing:.5px; text-transform:uppercase; border:1px solid var(--btn-border); color:var(--color-text); position:relative; overflow:hidden; transition: background .4s var(--easing), color .4s var(--easing), border-color .4s var(--easing); }
.btn.primary { --btn-bg: var(--gradient-accent); border: none; background: var(--gradient-accent); color:#fff; }
.btn.primary:hover { filter: brightness(1.1); }
.btn.ghost:hover { background: rgba(255,255,255,0.15); }

/* Footer */
.site-footer { background:#000d1a; padding:2.5rem 0; font-size:.75rem; color: var(--color-text-soft); border-top:1px solid rgba(255,255,255,0.06); }
.footer-inner { flex-wrap:wrap; gap:1rem; }
.footer-links { list-style:none; display:flex; gap:1.5rem; margin:0; padding:0; }
.footer-links a { color: var(--color-text-soft); }
.footer-links a:hover { color: var(--color-text); }

/* Utilities */
.container.narrow { max-width:760px; }
.br-md { display:none; }

/* Responsive */
@media (max-width: 880px) {
  .nav-toggle { display:block; }
  .nav-menu { position:absolute; top:100%; right:0; background:#001427; border:1px solid rgba(255,255,255,0.08); flex-direction:column; padding:1rem 1.25rem; gap:1rem; width:220px; transform-origin: top right; transform: scale(.9) translateY(-10px); opacity:0; pointer-events:none; transition: all .4s var(--easing); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
  .nav-menu.open { opacity:1; transform: scale(1) translateY(0); pointer-events:auto; }
  .hero { padding-top: 6.5rem; }
  .br-md { display:inline; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition: none !important; }
}