/* ============================================
   LEDGER VALLEY - Precision Editorial
   Financial Technology & Professional Services

   Design: Deep navy + warm brass on paper.
   Typography: Instrument Serif + Plus Jakarta Sans.
   Mood: "This site feels like money."
   ============================================ */

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

:root {
  /* Color System - Precision Editorial */
  --color-ink: #0f1923;
  --color-ink-soft: #2a3a4a;
  --color-ink-muted: #6b7a8a;
  --color-surface: #faf9f7;
  --color-surface-warm: #f5f3ef;
  --color-surface-dark: #0f1923;
  --color-border: #e2dfd8;
  --color-border-light: #eceae4;
  --color-accent: #c8a97e;
  --color-accent-dim: rgba(200, 169, 126, 0.15);
  --color-accent-hover: #b8965e;
  --color-white: #ffffff;

  /* Typography */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4.5rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  /* Layout */
  --container-max: 1140px;
  --container-narrow: 720px;
  --gutter: 2.5rem;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 200ms;
  --duration-base: 500ms;
  --duration-slow: 800ms;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--color-ink);
  background-color: var(--color-surface);
  line-height: 1.7;
  letter-spacing: -0.01em;
  overflow-x: hidden;
  position: relative;
}

/* Grain overlay - tactile depth */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

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

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

ul, ol {
  list-style: none;
}

::selection {
  background: var(--color-accent);
  color: var(--color-ink);
}

/* --- Typography --- */
h1, h2 {
  font-family: var(--font-body);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: var(--color-ink);
}

h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

h4, h5, h6 {
  font-family: var(--font-body);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 5vw + 0.5rem, 3.75rem);
}

h2 {
  font-size: clamp(1.875rem, 3.5vw + 0.5rem, 2.75rem);
}

h3 {
  font-size: clamp(1.25rem, 1.5vw + 0.5rem, 1.625rem);
}

h4 {
  font-size: 1.0625rem;
  font-weight: 600;
}

p {
  max-width: 60ch;
}

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

.text-label {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: inline-block;
}

.text-large {
  font-size: 1.1875rem;
  line-height: 1.65;
  color: var(--color-ink-soft);
}

/* Brass rule - signature element */
.brass-rule {
  width: 48px;
  height: 2px;
  background: var(--color-accent);
  border: none;
}

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

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

section {
  padding-block: var(--space-3xl);
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

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

/* --- Header & Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 249, 247, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-base) var(--ease-smooth),
              background var(--duration-base) var(--ease-smooth);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
}

.site-header.nav-open {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border-bottom-color: transparent;
}

.site-header.nav-open .site-logo img {
  filter: brightness(0) invert(1);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.site-logo {
  display: flex;
  align-items: center;
  z-index: 301;
}

.site-logo img {
  height: 26px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.site-nav a {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
  transition: color var(--duration-fast) var(--ease-smooth);
  position: relative;
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width var(--duration-base) var(--ease-out);
}

.site-nav a:hover {
  color: var(--color-ink);
}

.site-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.25rem;
  background: var(--color-ink);
  color: var(--color-surface) !important;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: 0;
  transition: background var(--duration-fast) var(--ease-smooth);
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  background: var(--color-accent-hover);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 28px;
  height: 20px;
  position: relative;
  z-index: 301;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-ink);
  position: absolute;
  left: 0;
  transition: all 0.35s var(--ease-out);
}

.nav-toggle span:nth-child(1) { top: 0; }
.nav-toggle span:nth-child(2) { top: 9px; }
.nav-toggle span:nth-child(3) { top: 18px; }

.nav-toggle.active span:nth-child(1) {
  top: 9px;
  transform: rotate(45deg);
}

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

.nav-toggle.active span:nth-child(3) {
  top: 9px;
  transform: rotate(-45deg);
}

/* --- Hero --- */
.hero {
  padding-top: calc(60px + var(--space-4xl));
  padding-bottom: var(--space-3xl);
  position: relative;
}

.hero__label {
  margin-bottom: var(--space-md);
}

.hero__title {
  margin-bottom: var(--space-lg);
  max-width: 14ch;
}

.hero__title .text-accent {
  display: block;
  font-family: var(--font-body);
  font-style: normal;
  font-size: 0.35em;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-top: 0.75em;
}

.hero__body {
  max-width: 520px;
  margin-bottom: var(--space-xl);
}

.hero__body p {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.hero__rule {
  width: 48px;
  height: 2px;
  background: var(--color-accent);
  margin-top: var(--space-3xl);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);
}

.btn--primary {
  background: var(--color-ink);
  color: var(--color-surface);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-ink);
}

.btn--ghost {
  background: transparent;
  color: var(--color-ink);
  padding-inline: 0;
  text-transform: none;
  letter-spacing: 0;
  font-weight: 500;
  position: relative;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.25rem;
}

.btn--ghost:hover {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent-hover);
}

.btn__arrow {
  transition: transform var(--duration-fast) var(--ease-smooth);
  font-size: 1.1em;
}

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

/* --- Capabilities Section --- */
.capabilities {
  background: var(--color-surface-warm);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
  position: relative;
}

.capabilities__header {
  margin-bottom: var(--space-2xl);
}

.capabilities__header h2 {
  margin-top: var(--space-sm);
}

.capability-card {
  padding: var(--space-lg) var(--space-lg) var(--space-2xl);
  border-left: 2px solid var(--color-border);
  background: transparent;
  transition: border-color var(--duration-base) var(--ease-smooth);
  position: relative;
}

.capability-card:hover {
  border-left-color: var(--color-accent);
}

.capability-card__number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-style: italic;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-md);
}

.capability-card h3 {
  margin-bottom: var(--space-sm);
  font-size: 1.375rem;
}

.capability-card p {
  font-size: 0.9375rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
}

/* --- Approach --- */
.approach {
  position: relative;
}

.approach__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.approach__sticky {
  position: sticky;
  top: calc(60px + var(--space-xl));
}

.approach__sticky h2 {
  margin-top: var(--space-sm);
}

.approach__items {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.approach-item {
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border-light);
}

.approach-item:last-child {
  border-bottom: none;
}

.approach-item__number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-style: italic;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.approach-item h4 {
  margin-bottom: var(--space-sm);
}

.approach-item p {
  font-size: 0.9375rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
}

/* --- Partners --- */
.partners {
  background: var(--color-surface-dark);
  color: var(--color-surface);
  position: relative;
  overflow: hidden;
}

/* Diagonal accent line */
.partners::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent) 30%, transparent 30%);
}

.partners .text-label {
  color: var(--color-accent);
}

.partners h2 {
  color: var(--color-surface);
  margin-top: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.partners__logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
  flex-wrap: wrap;
  padding-block: var(--space-xl);
}

.partners__logos span {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-style: italic;
  color: rgba(250, 249, 247, 0.3);
  transition: color var(--duration-fast) var(--ease-smooth);
  white-space: nowrap;
}

.partners__logos span:hover {
  color: var(--color-accent);
}

.partners__note {
  text-align: center;
  color: rgba(250, 249, 247, 0.4);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
}

/* --- FAQ --- */
.faq {
  background: var(--color-surface-warm);
  border-top: 1px solid var(--color-border-light);
}

.faq__header {
  margin-bottom: var(--space-2xl);
}

.faq__header h2 {
  margin-top: var(--space-sm);
}

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

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-md) 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-ink);
  text-align: left;
  letter-spacing: -0.01em;
  transition: color var(--duration-fast) var(--ease-smooth);
}

.faq-item__question:hover {
  color: var(--color-accent-hover);
}

.faq-item__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-left: var(--space-md);
  position: relative;
}

.faq-item__icon::before,
.faq-item__icon::after {
  content: '';
  position: absolute;
  background: var(--color-accent);
  transition: transform 0.35s var(--ease-out);
}

.faq-item__icon::before {
  width: 14px;
  height: 1.5px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-item__icon::after {
  width: 1.5px;
  height: 14px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-item.active .faq-item__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease-out);
}

.faq-item__answer-inner {
  padding-bottom: var(--space-md);
}

.faq-item__answer p {
  font-size: 0.9375rem;
  color: var(--color-ink-soft);
  line-height: 1.75;
}

.faq-item.active .faq-item__answer {
  max-height: 300px;
}

/* --- CTA Banner --- */
.cta-banner {
  background: var(--color-surface);
  text-align: center;
}

.cta-banner__inner {
  background: var(--color-surface-dark);
  color: var(--color-surface);
  padding: var(--space-3xl) var(--space-2xl);
  position: relative;
  overflow: hidden;
}

/* Brass corner accents */
.cta-banner__inner::before,
.cta-banner__inner::after {
  content: '';
  position: absolute;
  width: 48px;
  height: 48px;
  border: 1.5px solid var(--color-accent);
  opacity: 0.4;
}

.cta-banner__inner::before {
  top: var(--space-lg);
  left: var(--space-lg);
  border-right: none;
  border-bottom: none;
}

.cta-banner__inner::after {
  bottom: var(--space-lg);
  right: var(--space-lg);
  border-left: none;
  border-top: none;
}

.cta-banner .text-label {
  color: var(--color-accent);
}

.cta-banner h2 {
  color: var(--color-surface);
  margin-top: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.cta-banner p {
  margin-inline: auto;
  margin-bottom: var(--space-lg);
  color: rgba(250, 249, 247, 0.6);
}

.cta-banner .btn--primary {
  background: var(--color-accent);
  color: var(--color-ink);
}

.cta-banner .btn--primary:hover {
  background: var(--color-surface);
  color: var(--color-ink);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-surface-dark);
  color: rgba(250, 249, 247, 0.5);
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-lg);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(250, 249, 247, 0.08);
}

.footer__brand {
  max-width: 280px;
}

.footer__brand .site-logo img {
  /* Invert for dark bg */
  filter: brightness(0) invert(1);
}

.footer__brand p {
  font-size: 0.875rem;
  margin-top: var(--space-sm);
  line-height: 1.7;
  color: rgba(250, 249, 247, 0.4);
}

.footer__heading {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.footer__links a {
  display: block;
  font-size: 0.875rem;
  color: rgba(250, 249, 247, 0.5);
  padding-block: 0.3rem;
  transition: color var(--duration-fast) var(--ease-smooth);
}

.footer__links a:hover {
  color: var(--color-surface);
}

.footer__contact p {
  font-size: 0.875rem;
  color: rgba(250, 249, 247, 0.4);
  margin-bottom: 0.25rem;
}

.footer__contact a {
  transition: color var(--duration-fast) var(--ease-smooth);
}

.footer__contact a:hover {
  color: var(--color-accent);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-lg);
  font-size: 0.75rem;
  color: rgba(250, 249, 247, 0.25);
}

.footer__legal {
  display: flex;
  gap: var(--space-md);
}

.footer__legal a {
  transition: color var(--duration-fast) var(--ease-smooth);
}

.footer__legal a:hover {
  color: var(--color-accent);
}

/* --- Animations --- */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-on-scroll {
  opacity: 0;
}

.animate-on-scroll.visible {
  animation: fadeUp var(--duration-slow) var(--ease-out) forwards;
}

.stagger-1 { animation-delay: 0ms; }
.stagger-2 { animation-delay: 120ms; }
.stagger-3 { animation-delay: 240ms; }

/* ============================================
   RESPONSIVE - Tablet
   ============================================ */
@media (max-width: 1024px) {
  .grid--3 {
    grid-template-columns: 1fr 1fr;
  }

  .approach__grid {
    grid-template-columns: 1fr;
  }

  .approach__sticky {
    position: static;
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

/* ============================================
   RESPONSIVE - Mobile
   ============================================ */
@media (max-width: 768px) {
  :root {
    --gutter: 1.5rem;
    --space-3xl: 3.5rem;
    --space-4xl: 5rem;
  }

  /* Mobile nav - full screen takeover */
  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    background: var(--color-surface-dark);
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: var(--space-2xl) var(--gutter);
    gap: var(--space-md);
    z-index: 200;
    display: flex;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s var(--ease-smooth), visibility 0.3s;
  }

  .site-nav.open {
    visibility: visible;
    opacity: 1;
  }

  .site-nav a {
    font-family: var(--font-display);
    font-size: 2rem;
    font-style: italic;
    font-weight: 400;
    color: var(--color-surface);
    opacity: 0.6;
    transition: opacity var(--duration-fast) var(--ease-smooth);
    transform: translateY(12px);
  }

  .site-nav.open a {
    transform: translateY(0);
    transition: opacity var(--duration-fast) var(--ease-smooth),
                transform 0.4s var(--ease-out);
  }

  .site-nav a::after {
    display: none;
  }

  .site-nav a:hover,
  .site-nav a:active {
    opacity: 1;
    color: var(--color-accent);
  }

  .site-nav .nav-cta {
    margin-top: var(--space-lg);
    font-family: var(--font-body);
    font-style: normal;
    font-size: 0.875rem;
    padding: 0.875rem 2rem;
    background: var(--color-accent);
    color: var(--color-ink) !important;
    opacity: 1;
  }

  .nav-toggle {
    display: block;
  }

  .nav-toggle.active span {
    background: var(--color-surface);
  }

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

  /* Hero mobile */
  .hero {
    padding-top: calc(60px + var(--space-xl));
    padding-bottom: var(--space-2xl);
  }

  .hero__title {
    font-size: 2.25rem;
    max-width: none;
  }

  .hero__body p {
    font-size: 1rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-sm);
  }

  .hero__actions .btn--primary {
    justify-content: center;
    padding: 1rem 1.5rem;
    font-size: 0.8125rem;
  }

  .hero__actions .btn--ghost {
    align-self: flex-start;
    padding: 0.5rem 0;
    font-size: 0.875rem;
  }

  .hero__rule {
    margin-top: var(--space-2xl);
  }

  /* Capabilities mobile */
  .capability-card {
    padding: var(--space-md) var(--space-md) var(--space-lg);
  }

  .capability-card__number {
    font-size: 2rem;
  }

  /* Approach mobile */
  .approach__sticky p {
    font-size: 1rem;
  }

  .approach-item__number {
    font-size: 1.5rem;
  }

  /* Partners mobile */
  .partners__logos {
    gap: var(--space-sm) var(--space-lg);
  }

  .partners__logos span {
    font-size: 1rem;
  }

  /* CTA mobile */
  .cta-banner__inner {
    padding: var(--space-2xl) var(--space-md);
  }

  .cta-banner__inner::before {
    top: var(--space-sm);
    left: var(--space-sm);
    width: 32px;
    height: 32px;
  }

  .cta-banner__inner::after {
    bottom: var(--space-sm);
    right: var(--space-sm);
    width: 32px;
    height: 32px;
  }

  .cta-banner h2 {
    font-size: 1.625rem;
  }

  .cta-banner p {
    font-size: 0.9375rem;
  }

  /* FAQ mobile */
  .faq-item__question {
    font-size: 0.9375rem;
    padding: var(--space-sm) 0;
  }

  /* Footer mobile */
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

/* ============================================
   RESPONSIVE - Small phones
   ============================================ */
@media (max-width: 390px) {
  :root {
    --gutter: 1.125rem;
  }

  .hero__title {
    font-size: 1.875rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .text-large {
    font-size: 1rem;
  }

  .site-nav a {
    font-size: 1.625rem;
  }
}