/* ============================================
   NATHAN OFFICE — GLOBAL STYLES
   Design: Anthropic-inspired clean + navy/gold
   ============================================ */

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

:root {
  /* Colour System */
  --navy: #0A1930;
  --navy-light: #0D2240;
  --navy-dark: #071525;
  --gold: #C4A058;
  --gold-light: #D4B272;
  --gold-muted: rgba(196, 160, 88, 0.15);
  --white: #FFFFFF;
  --off-white: #F5F7FA;
  --cream: #EDE5D5;
  --light-grey: #E2E6EC;
  --mid-grey: #9AA0A8;
  --text-primary: #1A1A1A;
  --text-secondary: #4A4A4A;
  --text-muted: #8A8580;
  --border-light: rgba(27, 42, 74, 0.08);
  --border-medium: rgba(27, 42, 74, 0.15);

  /* Typography */
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-accent: 'Cormorant', Georgia, 'Times New Roman', serif;

  /* Spacing */
  --section-padding: 120px;
  --section-padding-mobile: 72px;
  --container-max: 1200px;
  --container-narrow: 800px;
  --container-wide: 1400px;

  /* Animation */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-dramatic: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 0.3s;
  --duration-medium: 0.8s;
  --duration-slow: 1.2s;

  /* Shadows */
  --shadow-sm: 0 1px 12px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--white);
  overflow-x: hidden;
}

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

a {
  color: var(--navy);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--gold);
}

/* --- Typography Scale --- */
h1, h2 {
  font-family: var(--font-accent);
  font-weight: 300;
  line-height: 1.2;
  color: var(--navy);
}

h3, h4, h5 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

h3 {
  font-size: clamp(1.1rem, 1.6vw, 1.3rem);
}

h4 {
  font-size: 0.95rem;
  font-weight: 600;
}

p {
  margin-bottom: 1.2em;
  color: var(--text-secondary);
}

p:last-child {
  margin-bottom: 0;
}

.accent-font {
  font-family: var(--font-accent);
  font-style: italic;
}

.text-gold {
  color: var(--gold);
}

.text-navy {
  color: var(--navy);
}

.text-muted {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* --- Layout Utilities --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section--cream {
  background-color: var(--cream);
}

.section--off-white {
  background-color: var(--off-white);
}

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

.section--navy h1,
.section--navy h2,
.section--navy h3,
.section--navy h4 {
  color: var(--white);
}

.section--navy p {
  color: rgba(255, 255, 255, 0.8);
}

.section--navy .label {
  color: var(--gold);
}

.section--gradient {
  background: linear-gradient(180deg, var(--white) 0%, var(--cream) 100%);
}

.section--gradient-reverse {
  background: linear-gradient(180deg, var(--cream) 0%, var(--white) 100%);
}

/* --- Section Label (small uppercase text above headings) --- */
.label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 16px;
}

.label--navy {
  color: var(--navy-light);
}

/* --- Divider --- */
.divider {
  width: 48px;
  height: 2px;
  background-color: var(--gold);
  margin: 32px 0;
}

.divider--center {
  margin-left: auto;
  margin-right: auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 36px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  text-decoration: none;
}

.btn--primary {
  background-color: var(--navy);
  color: var(--white);
}

.btn--primary:hover {
  background-color: var(--navy-light);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(27, 42, 74, 0.2);
}

.btn--secondary {
  background-color: transparent;
  color: var(--navy);
  border: 1.5px solid var(--border-medium);
}

.btn--secondary:hover {
  border-color: var(--navy);
  color: var(--navy);
  transform: translateY(-2px);
}

.btn--gold {
  background-color: var(--gold);
  color: var(--navy-dark);
}

.btn--gold:hover {
  background-color: var(--gold-light);
  color: var(--navy-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(196, 160, 88, 0.3);
}

.btn--white {
  background-color: var(--white);
  color: var(--navy);
}

.btn--white:hover {
  background-color: var(--off-white);
  color: var(--navy);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.btn-arrow {
  transition: transform var(--duration-fast) var(--ease-out);
}

.btn:hover .btn-arrow {
  transform: translateX(4px);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: all var(--duration-fast) var(--ease-out);
}

.nav--scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
}

/* When menu is open, make nav fully opaque to prevent backdrop-filter bleed */
.nav--menu-open {
  background: var(--white);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 32px;
  height: 72px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav__logo img {
  height: 48px;
  width: auto;
}

.nav__links {
  display: none;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav__links a {
  font-size: 0.88rem;
  font-weight: 450;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background-color: var(--gold);
  transition: width var(--duration-fast) var(--ease-out);
}

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

.nav__links a:hover::after {
  width: 100%;
}

.nav__links a.active {
  color: var(--navy);
  font-weight: 500;
}

.nav__links a.active::after {
  width: 100%;
}

.nav__cta {
  padding: 10px 24px !important;
  font-size: 0.85rem !important;
  background-color: var(--gold) !important;
  color: var(--navy-dark) !important;
  border-radius: 6px;
  font-weight: 600 !important;
}

.nav__cta:hover {
  background-color: var(--gold-light) !important;
  color: var(--navy-dark) !important;
  transform: translateY(-1px);
}

/* Menu Button — always visible (hamburger on all screen sizes) */
.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--navy);
  transition: all var(--duration-fast) var(--ease-out);
  border-radius: 1px;
}

.nav__toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Slide-out Menu */
.nav__mobile {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  padding: 104px 32px 32px;
  background: var(--white) !important;
  flex-direction: column;
  gap: 0;
  z-index: 998;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  isolation: isolate;
}

.nav__mobile.active {
  display: flex;
}

.nav__mobile a {
  display: block;
  padding: 18px 0;
  font-size: 1.1rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-light);
  font-weight: 450;
}

.nav__mobile a:hover,
.nav__mobile a.active {
  color: var(--navy);
}

.nav__mobile .btn {
  margin-top: 24px;
  text-align: center;
  justify-content: center;
}

/* --- Scroll Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(70px);
  filter: blur(4px);
  transition: opacity var(--duration-slow) var(--ease-dramatic),
              transform var(--duration-slow) var(--ease-dramatic),
              filter var(--duration-slow) var(--ease-dramatic);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-80px);
  filter: blur(3px);
  transition: opacity var(--duration-slow) var(--ease-dramatic),
              transform var(--duration-slow) var(--ease-dramatic),
              filter var(--duration-slow) var(--ease-dramatic);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
  filter: blur(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(80px);
  filter: blur(3px);
  transition: opacity var(--duration-slow) var(--ease-dramatic),
              transform var(--duration-slow) var(--ease-dramatic),
              filter var(--duration-slow) var(--ease-dramatic);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
  filter: blur(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.88);
  filter: blur(4px);
  transition: opacity var(--duration-slow) var(--ease-dramatic),
              transform var(--duration-slow) var(--ease-dramatic),
              filter var(--duration-slow) var(--ease-dramatic);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
  filter: blur(0);
}

.reveal-fade {
  opacity: 0;
  filter: blur(2px);
  transition: opacity var(--duration-slow) var(--ease-dramatic),
              filter var(--duration-slow) var(--ease-dramatic);
}

.reveal-fade.visible {
  opacity: 1;
  filter: blur(0);
}

/* Staggered children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(50px);
  filter: blur(3px);
  transition: opacity var(--duration-medium) var(--ease-dramatic),
              transform var(--duration-medium) var(--ease-dramatic),
              filter var(--duration-medium) var(--ease-dramatic);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0s; opacity: 1; transform: translateY(0); filter: blur(0); }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.15s; opacity: 1; transform: translateY(0); filter: blur(0); }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.3s; opacity: 1; transform: translateY(0); filter: blur(0); }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.45s; opacity: 1; transform: translateY(0); filter: blur(0); }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.6s; opacity: 1; transform: translateY(0); filter: blur(0); }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.75s; opacity: 1; transform: translateY(0); filter: blur(0); }

/* Divider draw animation */
.divider {
  width: 0;
  transition: width 0.8s var(--ease-dramatic);
}

.divider.visible,
.reveal.visible .divider,
.reveal.visible + .divider,
.visible ~ .divider {
  width: 48px;
}

/* Counter animation */
.counter {
  display: inline-block;
}

/* --- Cards --- */
.card {
  background: var(--white);
  border-radius: 12px;
  padding: 40px;
  border: 1px solid var(--border-light);
  transition: all var(--duration-fast) var(--ease-out);
}

.card:hover {
  border-color: var(--border-medium);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  transform: translateY(-4px);
}

.card--flat {
  border: none;
  background: var(--off-white);
}

.card--flat:hover {
  background: var(--cream);
  box-shadow: none;
}

.card--bordered-gold {
  border-left: 3px solid var(--gold);
}

.card--navy {
  background: var(--navy);
  border: none;
}

.card--navy h3, .card--navy h4 {
  color: var(--white);
}

.card--navy p {
  color: rgba(255, 255, 255, 0.75);
}

/* --- Grid Layouts --- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* --- Pull Quote --- */
.pull-quote {
  font-family: var(--font-accent);
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-style: italic;
  color: var(--navy);
  line-height: 1.5;
  padding: 40px 0;
  border-top: 2px solid var(--gold);
  border-bottom: 1px solid var(--border-light);
  margin: 48px 0;
}

/* --- Publication / Credibility Logos --- */
.logo-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.logo-strip img {
  width: 150px;
  height: auto;
  max-height: 60px;
  object-fit: contain;
  transition: all var(--duration-fast) var(--ease-out);
}

.logo-strip img:hover {
  transform: scale(1.05);
}

.logo-strip a {
  display: flex;
  align-items: center;
}

/* Recognition Banner */
.recognition-banner {
  background: var(--off-white);
  text-align: center;
  padding: 56px 0;
}

.recognition-banner__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.recognition-banner__awards {
  display: flex;
  align-items: center;
  gap: 32px;
}

.recognition-banner__awards img {
  height: 70px;
  width: auto;
  object-fit: contain;
}

.recognition-banner__divider {
  width: 1px;
  height: 60px;
  background: var(--light-grey);
  flex-shrink: 0;
}

.recognition-banner__media {
  display: flex;
  align-items: center;
  gap: 48px;
}

.recognition-banner__media img {
  width: 140px;
  height: auto;
  object-fit: contain;
  opacity: 0.85;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.recognition-banner__media img:hover {
  opacity: 1;
}

.recognition-banner__media a,
.recognition-banner__media span {
  display: flex;
  align-items: center;
}

.recognition-banner__label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0;
}

@media (max-width: 768px) {
  .recognition-banner {
    padding: 40px 0;
  }

  .recognition-banner__inner {
    flex-direction: column;
    gap: 32px;
  }

  .recognition-banner__awards {
    gap: 24px;
  }

  .recognition-banner__awards img {
    height: 55px;
  }

  .recognition-banner__divider {
    width: 80px;
    height: 1px;
  }

  .recognition-banner__media {
    gap: 32px;
  }

  .recognition-banner__media img {
    width: 100px;
  }
}

/* --- Footer --- */
.footer {
  background: var(--navy-dark);
  color: rgba(255, 255, 255, 0.6);
  padding: 64px 0 40px;
  font-size: 0.9rem;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
  flex-wrap: wrap;
}

.footer__brand img {
  height: 72px;
  margin-bottom: 20px;
}

.footer__tagline {
  color: var(--gold);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.footer__links {
  display: flex;
  gap: 48px;
}

.footer__col h4 {
  color: var(--white);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer__col a {
  display: block;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.88rem;
  margin-bottom: 10px;
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__col a:hover {
  color: var(--white);
}

.footer__bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.4);
}

.footer__social {
  display: flex;
  gap: 16px;
}

.footer__social a {
  color: rgba(255, 255, 255, 0.4);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__social a:hover {
  color: var(--gold);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .section {
    padding: 96px 0;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 16px;
  }

  .section {
    padding: var(--section-padding-mobile) 0;
  }

  .nav__inner {
    padding: 0 20px;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .card {
    padding: 28px;
  }

  .footer__inner {
    flex-direction: column;
  }

  .footer__links {
    flex-direction: column;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .logo-strip {
    gap: 32px;
  }

  .logo-strip img {
    width: 120px;
    max-height: 48px;
  }

  .pull-quote {
    font-size: 1.3rem;
    padding: 28px 0;
    margin: 32px 0;
  }

  .btn {
    padding: 14px 28px;
    font-size: 0.9rem;
    width: 100%;
    max-width: 400px;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 18px;
  }
}