/* ===============================
   BASE — Variables, Reset, Typography
================================ */

:root {
  color-scheme: dark;
  /* Brand colours from logo */
  --clr-brand-900: #061b26;
  --clr-brand-800: #032d41;
  --clr-brand-700: #0a3a52;
  --clr-brand-600: #0f4a65;
  --clr-brand-500: #1a6280;

  /* Accent */
  --clr-accent: #00b4d8;
  --clr-accent-light: #67e3ff;
  --clr-accent-dim: rgba(0, 180, 216, 0.15);

  /* Secondary accents */
  --clr-warm: #f59e0b;
  --clr-warm-dim: rgba(245, 158, 11, 0.15);
  --clr-purple: #a78bfa;
  --clr-purple-dim: rgba(167, 139, 250, 0.15);
  --clr-green: #34d399;
  --clr-red: #fb7185;

  /* Text */
  --clr-text-100: #f0f9ff;
  --clr-text-200: #bae6fd;
  --clr-text-300: #7dd3fc;
  --clr-text-muted: #4a7a8a;
  --clr-text-subtle: #2d5a6e;

  /* Borders */
  --clr-border: rgba(0, 180, 216, 0.12);
  --clr-border-strong: rgba(0, 180, 216, 0.25);

  /* Backgrounds */
  --bg-page: var(--clr-brand-900);
  --bg-section: var(--clr-brand-800);
  --bg-card: rgba(10, 58, 82, 0.5);
  --bg-card-hover: rgba(15, 74, 101, 0.7);

  /* Typography */
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Madimi One', var(--font-body);

  /* Sizing */
  --container-max: 1160px;
  --container-pad: clamp(1rem, 5vw, 2.5rem);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Shadows */
  --shadow-card: 0 1px 3px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.3);
  --shadow-card-hover: 0 4px 12px rgba(0,0,0,.5), 0 20px 48px rgba(0,180,216,.1);

  /* Transitions */
  --ease: cubic-bezier(.4, 0, .2, 1);
  --dur: 200ms;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-page);
  color: var(--clr-text-100);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--clr-text-100);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }
h4 { font-size: 1rem; }

p { color: var(--clr-text-200); }

a {
  color: var(--clr-accent);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
a:hover { color: var(--clr-accent-light); }

img, svg { display: block; }

ul { list-style: none; }

/* Layout helpers */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: clamp(4rem, 8vw, 7rem);
}

.section--dark {
  background-color: var(--bg-section);
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-tag {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--clr-accent);
  margin-bottom: .75rem;
}

.section-sub {
  margin-top: .75rem;
  font-size: 1.05rem;
  color: var(--clr-text-200);
}

/* Accent colour */
.accent { color: var(--clr-accent); }

/* Icon utility */
.icon {
  width: 1.25em;
  height: 1.25em;
  flex-shrink: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--dur) var(--ease);
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--clr-accent);
  color: var(--clr-brand-900);
  border-color: var(--clr-accent);
}
.btn-primary:hover {
  background: var(--clr-accent-light);
  border-color: var(--clr-accent-light);
  color: var(--clr-brand-900);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(0,180,216,.35);
}

.btn-outline {
  background: transparent;
  color: var(--clr-text-100);
  border-color: var(--clr-border-strong);
}
.btn-outline:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
}

.btn--warm {
  border-color: rgba(245,158,11,.4);
  color: var(--clr-warm);
}
.btn--warm:hover {
  background: var(--clr-warm-dim);
  border-color: var(--clr-warm);
  color: var(--clr-warm);
}

.btn--purple {
  border-color: rgba(167,139,250,.4);
  color: var(--clr-purple);
}
.btn--purple:hover {
  background: var(--clr-purple-dim);
  border-color: var(--clr-purple);
  color: var(--clr-purple);
}

.btn--full { width: 100%; justify-content: center; }

/* Scroll reveal animations — only active when JS loaded */
.js-ready .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
.js-ready .reveal.visible {
  opacity: 1;
  transform: none;
}
.js-ready .reveal[data-delay="1"] { transition-delay: .1s; }
.js-ready .reveal[data-delay="2"] { transition-delay: .2s; }
.js-ready .reveal[data-delay="3"] { transition-delay: .3s; }
.js-ready .reveal[data-delay="4"] { transition-delay: .4s; }

/* Shared card base */
.card-link {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  margin-top: 1rem;
  font-size: .875rem;
  font-weight: 600;
  color: var(--clr-accent);
  text-decoration: none;
  transition: gap var(--dur) var(--ease), color var(--dur) var(--ease);
}
.card-link:hover {
  gap: .6rem;
  color: var(--clr-accent-light);
}

/* Check list utility */
.check-list {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.check-list li {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
}
.check-list li .icon.check {
  color: var(--clr-accent);
  margin-top: .2rem;
  flex-shrink: 0;
}
.check-list li div { display: flex; flex-direction: column; gap: .15rem; }
.check-list li strong { color: var(--clr-text-100); font-size: .95rem; }
.check-list li span { color: var(--clr-text-200); font-size: .875rem; }

/* Responsive */
@media (max-width: 640px) {
  .btn { font-size: .875rem; padding: .65rem 1.25rem; }
}