/* =========================================================
   River Street Advisory — Design System
   Navy #0F2A44 / Cream #F8F5EE / Amber #C77E3A
   Type: Inter Display (headlines) + Source Serif 4 (body)
   ========================================================= */

:root {
  --color-navy: #0F2A44;
  --color-navy-soft: #1A3A56;
  --color-cream: #F8F5EE;
  --color-cream-deep: #EFEADD;
  --color-amber: #C77E3A;
  --color-amber-text: #9E5419;
  --color-amber-hover: #8B4513;
  --color-ink: #1A1A1A;
  --color-muted: #5C5C5C;
  --color-divider: #D4D0C8;
  --color-divider-soft: #E5E1D8;

  --font-display: "Inter", system-ui, -apple-system, sans-serif;
  --font-serif: "Source Serif 4", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --max-width: 1200px;
  --reading-width: 680px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --space-32: 8rem;
}

/* =========================================================
   Reset & base
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--color-ink);
  background-color: var(--color-cream);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-navy);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms ease, color 180ms ease;
}
a:hover { border-bottom-color: var(--color-amber); }

/* Prose links: persistent underline so they aren't distinguished by color alone */
p a, li a { border-bottom-color: var(--color-divider); }
p a:hover, li a:hover { border-bottom-color: var(--color-amber); }

/* =========================================================
   Typography
   ========================================================= */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-navy);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 var(--space-6);
}

h1 {
  font-size: clamp(2.5rem, 5.5vw, 4.5rem);
  font-weight: 600;
  letter-spacing: -0.035em;
}
h2 {
  font-size: clamp(1.875rem, 3.5vw, 2.75rem);
  letter-spacing: -0.025em;
}
h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  letter-spacing: -0.015em;
}

p { margin: 0 0 var(--space-4); }
p.lead {
  font-size: 1.25rem;
  line-height: 1.55;
  color: var(--color-muted);
  max-width: 56ch;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-amber-text);
  margin: 0 0 var(--space-4);
}

/* =========================================================
   Layout primitives
   ========================================================= */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.container-narrow {
  max-width: var(--reading-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

section {
  padding: var(--space-24) 0;
}
section.tight { padding: var(--space-16) 0; }

.divider {
  height: 1px;
  background: var(--color-divider);
  border: none;
  margin: 0;
}

/* =========================================================
   Header / Navigation
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  background-color: rgba(248, 245, 238, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  z-index: 50;
  border-bottom: 1px solid var(--color-divider-soft);
}
.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--color-navy);
  border-bottom: none;
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  line-height: 1;
}
.wordmark__icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: block;
}
.wordmark__text {
  white-space: nowrap;
}
@media (max-width: 540px) {
  .wordmark__icon { width: 30px; height: 30px; }
  .wordmark__text {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
  }
}
.wordmark:hover { border-bottom: none; color: var(--color-navy); }
.wordmark__mark { color: var(--color-amber-text); }
.wordmark__tagline {
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  text-transform: none;
}

@media (max-width: 540px) {
  .wordmark__tagline { display: none; }
}

.nav {
  display: flex;
  gap: var(--space-8);
  align-items: center;
}
.nav a {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-ink);
  border-bottom: none;
  padding: var(--space-2) 0;
  position: relative;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--color-amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 220ms ease;
}
.nav a:hover::after,
.nav a.active::after {
  transform: scaleX(1);
}

@media (max-width: 640px) {
  .nav { gap: var(--space-4); }
  .nav a { font-size: 0.875rem; }
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  padding: var(--space-32) 0 var(--space-24);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(15, 42, 68, 0.05) 1px, transparent 0);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, transparent, black 25%, black 60%, transparent);
  -webkit-mask-image: linear-gradient(180deg, transparent, black 25%, black 60%, transparent);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.hero h1 {
  max-width: 18ch;
  margin-bottom: var(--space-8);
}
.hero p.lead {
  font-size: 1.375rem;
  max-width: 60ch;
  margin-bottom: var(--space-12);
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.875rem 1.5rem;
  border-radius: 6px;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 180ms ease;
  text-decoration: none;
}

.btn--primary {
  background: var(--color-navy);
  color: var(--color-cream);
  border: 1px solid var(--color-navy);
}
.btn--primary:hover {
  background: var(--color-navy-soft);
  border: 1px solid var(--color-navy-soft);
  color: var(--color-cream);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-navy);
  border: 1px solid var(--color-divider);
}
.btn--ghost:hover {
  background: transparent;
  border: 1px solid var(--color-navy);
  color: var(--color-navy);
}

.btn__arrow {
  transition: transform 220ms ease;
  font-family: var(--font-display);
}
.btn:hover .btn__arrow { transform: translateX(3px); }

/* =========================================================
   Service / feature cards
   ========================================================= */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  margin-top: var(--space-12);
}
.card {
  background: var(--color-cream-deep);
  border: 1px solid var(--color-divider-soft);
  border-radius: 8px;
  padding: var(--space-8);
  transition: transform 240ms ease, border-color 240ms ease;
}
.card:hover {
  border-color: var(--color-divider);
  transform: translateY(-2px);
}
.card__number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-amber-text);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-6);
}
.card h3 {
  margin-bottom: var(--space-3);
  font-size: 1.375rem;
}
.card p {
  color: var(--color-muted);
  font-size: 1rem;
  line-height: 1.6;
  margin: 0;
}

@media (max-width: 880px) {
  .cards { grid-template-columns: 1fr; gap: var(--space-4); }
}

/* =========================================================
   Two-column / split sections
   ========================================================= */
.split {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-16);
  align-items: start;
}
.split__label {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-amber-text);
}
@media (max-width: 880px) {
  .split { grid-template-columns: 1fr; gap: var(--space-8); }
}
/* When the left column has an eyebrow label, push the right column down
   so the body copy aligns with the H2 baseline instead of the eyebrow. */
@media (min-width: 881px) {
  .split:has(.split__label) > div:nth-child(2) {
    padding-top: calc(0.875rem * 1.6 + var(--space-4));
  }
}

/* =========================================================
   Stat / proof rows
   ========================================================= */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  padding: var(--space-12) 0;
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}
.stat__value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--color-navy);
  line-height: 1;
  margin-bottom: var(--space-3);
}
.stat__label {
  font-family: var(--font-display);
  font-size: 0.875rem;
  color: var(--color-muted);
  letter-spacing: -0.005em;
}
@media (max-width: 720px) {
  .stat-row { grid-template-columns: 1fr; gap: var(--space-6); }
}

/* =========================================================
   Services page — deep cards
   ========================================================= */
.service-block {
  display: grid;
  grid-template-columns: 0.5fr 1fr;
  gap: var(--space-12);
  padding: var(--space-16) 0;
  border-bottom: 1px solid var(--color-divider-soft);
}
.service-block:last-child { border-bottom: none; }
.service-block__index {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-amber-text);
  letter-spacing: 0.08em;
}
.service-block h2 {
  margin-top: var(--space-2);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
}
.service-block ul {
  list-style: none;
  padding: 0;
  margin: var(--space-6) 0 0;
}
.service-block li {
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-divider-soft);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 0.9375rem;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-6);
}
.service-block li:first-child { border-top: 1px solid var(--color-divider); }
.service-block li strong {
  font-weight: 500;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.75rem;
  padding-top: 2px;
}
@media (max-width: 880px) {
  .service-block { grid-template-columns: 1fr; gap: var(--space-6); }
  .service-block li { grid-template-columns: 1fr; gap: var(--space-2); }
}

/* =========================================================
   About — career narrative
   ========================================================= */
.timeline {
  margin-top: var(--space-12);
}
.timeline__item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-8);
  padding: var(--space-6) 0;
  border-top: 1px solid var(--color-divider-soft);
}
.timeline__item:first-child { border-top: 1px solid var(--color-divider); }
.timeline__phase {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-amber-text);
}
.timeline__phase span {
  display: block;
  font-size: 0.75rem;
  color: var(--color-muted);
  letter-spacing: 0.06em;
  text-transform: none;
  margin-top: var(--space-1);
}
.timeline__body h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-3);
}
.timeline__body p {
  color: var(--color-muted);
  font-size: 1rem;
}
@media (max-width: 720px) {
  .timeline__item { grid-template-columns: 1fr; gap: var(--space-3); }
}

/* =========================================================
   Contact form
   ========================================================= */
.form {
  display: grid;
  gap: var(--space-6);
  max-width: 540px;
}
.form__field {
  display: grid;
  gap: var(--space-2);
}
.form label {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
}
.form input,
.form textarea {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  color: var(--color-ink);
  background: var(--color-cream-deep);
  border: 1px solid var(--color-divider);
  border-radius: 6px;
  padding: var(--space-4);
  transition: border-color 180ms ease, background 180ms ease;
}
.form input:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--color-navy);
  background: #FFFFFF;
}
.form textarea {
  resize: vertical;
  min-height: 160px;
  line-height: 1.5;
}
.form__required {
  color: var(--color-amber-text);
  font-weight: 600;
  margin-left: 2px;
}
.form__legend {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  margin: 0;
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  padding: var(--space-16) 0 var(--space-12);
  border-top: 1px solid var(--color-divider-soft);
  background: var(--color-cream);
}
.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-8);
  align-items: end;
}
.site-footer__copy {
  font-family: var(--font-display);
  font-size: 0.875rem;
  color: var(--color-muted);
}
.site-footer__links {
  display: flex;
  gap: var(--space-6);
  font-family: var(--font-display);
  font-size: 0.875rem;
}
.site-footer__links a {
  color: var(--color-muted);
  border-bottom: none;
}
.site-footer__links a:hover { color: var(--color-navy); }

@media (max-width: 640px) {
  .site-footer__inner { grid-template-columns: 1fr; }
}

/* =========================================================
   Utilities
   ========================================================= */
.center { text-align: center; }

.mission {
  font-family: var(--font-serif);
  font-size: clamp(1.375rem, 2.4vw, 1.75rem);
  line-height: 1.4;
  color: var(--color-navy);
  max-width: 56ch;
  margin: 0 auto;
}
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }
.mt-24 { margin-top: var(--space-24); }

/* =========================================================
   Methodology page
   ========================================================= */

/* Section-level helpers reused on Methodology */
.section--cream-deep { background: var(--color-cream-deep); }
.heading--wide { max-width: 32ch; }
.section-intro { max-width: 56ch; }
.cta-lead { margin: 0 auto var(--space-8); }

/* Philosophy timeline ("reasons" variant of the base timeline) */
.reasons .timeline__body h3 {
  font-size: 1.375rem;
  margin-bottom: var(--space-3);
  max-width: 28ch;
}
.reasons .timeline__body p {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-ink);
}

/* Four-frameworks strip: name / description */
.frameworks-strip {
  margin-top: var(--space-12);
}
.frameworks-strip > div {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-12);
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-divider-soft);
  align-items: start;
}
.frameworks-strip > div:first-child { border-top: 1px solid var(--color-divider); }
.frameworks-strip > div:last-child { border-bottom: 1px solid var(--color-divider); }
.frameworks-strip h3 {
  font-size: 1.125rem;
  margin: 0;
  letter-spacing: -0.01em;
  max-width: 22ch;
}
.frameworks-strip p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}
@media (max-width: 880px) {
  .frameworks-strip > div { grid-template-columns: 1fr; gap: var(--space-3); }
}

/* Outcomes — what each engagement produces */
.outcomes {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-12);
}
.outcome-card {
  background: var(--color-cream-deep);
  border: 1px solid var(--color-divider-soft);
  border-radius: 8px;
  padding: var(--space-8);
}
.outcome-card h3 {
  font-size: 1.0625rem;
  margin-bottom: var(--space-3);
  max-width: 22ch;
}
.outcome-card p {
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin: 0;
}
@media (max-width: 720px) {
  .outcomes { grid-template-columns: 1fr; }
}