/* =========================================================
   IMHLANGA.COM — DESIGN SYSTEM
   Executive Navy & Slate — editorial economics platform
   ========================================================= */

:root {
  /* --- Brand --- */
  --navy: #0F172A;
  --navy-soft: #1E293B;
  --blue: #2563EB;
  --blue-dim: #1D4ED8;
  --amber: #D97706;
  --amber-bright: #F59E0B;

  /* --- Surfaces --- */
  --bg: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-alt: #F1F5F9;
  --bg-dark: #0F172A;
  --border: rgba(15, 23, 42, 0.08);
  --border-dark: rgba(248, 250, 252, 0.12);

  /* --- Text --- */
  --text: #334155;
  --text-muted: #64748B;
  --text-on-dark: #E2E8F0;
  --text-on-dark-muted: #94A3B8;
  --heading: var(--navy);

  /* --- Type --- */
  --font-serif: 'Playfair Display', 'Georgia', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* --- Scale --- */
  --step--1: clamp(0.86rem, 0.83rem + 0.14vw, 0.94rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --step-1: clamp(1.25rem, 1.17rem + 0.4vw, 1.5rem);
  --step-2: clamp(1.6rem, 1.45rem + 0.75vw, 2.1rem);
  --step-3: clamp(2.1rem, 1.8rem + 1.4vw, 3rem);
  --step-4: clamp(2.6rem, 2.1rem + 2.4vw, 4.2rem);

  /* --- Layout --- */
  --container: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius-sm: 4px;
  --radius: 10px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  color: var(--heading);
  line-height: 1.15;
  margin: 0 0 0.5em;
  font-weight: 700;
}

h1 {
  font-size: var(--step-4);
}

h2 {
  font-size: var(--step-3);
}

h3 {
  font-size: var(--step-2);
}

p {
  max-width: 68ch;
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.section--alt {
  background: var(--bg-alt);
}

.section--dark {
  background: var(--navy);
  color: var(--text-on-dark);
}

.section--dark h2,
.section--dark h3 {
  color: #fff;
}

.eyebrow {
  display: inline-block;
  font-size: var(--step--1);
  color: var(--blue);
  font-weight: 600;
  letter-spacing: 0.01em;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--amber);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--step--1);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn--primary {
  background: var(--blue);
  color: #fff;
}

.btn--primary:hover {
  background: var(--blue-dim);
}

.btn--amber {
  background: var(--amber);
  color: #fff;
}

.btn--amber:hover {
  background: #B45D05;
}

.btn--outline {
  background: transparent;
  border-color: var(--border);
  color: var(--navy);
}

.btn--outline:hover {
  border-color: var(--navy);
}

.btn--outline-light {
  background: transparent;
  border-color: var(--border-dark);
  color: #fff;
}

.btn--outline-light:hover {
  border-color: #fff;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 250, 252, 0.88);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.1rem;
}

.nav__brand {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  font-weight: 700;
  color: var(--navy);
}

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

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2vw, 2.25rem);
}

.nav__links a {
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--text);
  position: relative;
  padding-block: 0.25rem;
}

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

.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -2px;
  height: 2px;
  background: var(--amber);
  transition: right 0.25s var(--ease);
}

.nav__links a:hover::after,
.nav__links a[aria-current="page"]::after {
  right: 0;
}

.nav__links a[aria-current="page"] {
  color: var(--navy);
  font-weight: 600;
}

.nav__cta {
  margin-left: 0.5rem;
}

.nav__cta a {
  color: var(--bg-card);
 }

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 2.25rem;
  height: 2.25rem;
  position: relative;
}

.nav__toggle span,
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute;
  left: 0.4rem;
  right: 0.4rem;
  height: 2px;
  background: var(--navy);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}

.nav__toggle span {
  top: 50%;
  transform: translateY(-50%);
}

.nav__toggle span::before {
  top: -7px;
}

.nav__toggle span::after {
  top: 7px;
}

.nav__toggle[aria-expanded="true"] span {
  background: transparent;
}

.nav__toggle[aria-expanded="true"] span::before {
  top: 0;
  transform: rotate(45deg);
}

.nav__toggle[aria-expanded="true"] span::after {
  top: 0;
  transform: rotate(-45deg);
}


/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
}

.brand__mark {
  flex: none;
  width: 2.25rem;
  height: 2.25rem;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand__sub {
  margin-top: 0.25rem;
  font-size: 0.8405rem;
  letter-spacing: 0.02em;
  color: var(--text-muted);
}

@media (max-width: 860px) {
  .nav__toggle {
    display: block;
  }

  .nav__links {
    position: fixed;
    inset: 0 0 auto auto;
    top: 68px;
    flex-direction: column;
    align-items: flex-start;
    background: var(--bg-card);
    width: min(320px, 82vw);
    height: calc(100vh - 68px);
    padding: 2rem var(--gutter);
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform 0.3s var(--ease);
    gap: 1.75rem;
  }

  .nav__links.is-open {
    transform: translateX(0);
  }

  .nav__cta {
    margin-left: 0;
  }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy);
  color: var(--text-on-dark);
  padding-block: clamp(3rem, 6vw, 4.5rem) 2rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border-dark);
}

.footer__brand {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  color: #fff;
  margin-bottom: 0.75rem;
}

.footer__tagline {
  color: var(--text-on-dark-muted);
  font-size: var(--step--1);
  max-width: 32ch;
}

.footer h4 {
  font-family: var(--font-sans);
  color: #fff;
  font-size: var(--step--1);
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer__links li {
  margin-bottom: 0.65rem;
}

.footer__links a {
  color: var(--text-on-dark-muted);
  font-size: var(--step--1);
}

.footer__links a:hover {
  color: #fff;
}

.footer__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.5rem;
  font-size: var(--step--1);
  color: var(--text-on-dark-muted);
}

@media (max-width: 720px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Scroll reveal ---------- */
.reveal-on-scroll,
.reveal-left,
.reveal-right {
  opacity: 0;
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal-on-scroll {
  transform: translateY(18px);
}

.reveal-left {
  transform: translateX(-24px);
}

.reveal-right {
  transform: translateX(24px);
}

.reveal-on-scroll.is-visible,
.reveal-left.is-visible,
.reveal-right.is-visible {
  opacity: 1;
  transform: none;
}

.delay-100 {
  transition-delay: 0.1s;
}

.delay-200 {
  transition-delay: 0.2s;
}

.delay-300 {
  transition-delay: 0.3s;
}

@media (prefers-reduced-motion: reduce) {

  .reveal-on-scroll,
  .reveal-left,
  .reveal-right {
    opacity: 1;
    transform: none;
    transition: none;
  }
}