/* ============================================================
   Obsidian North, LLC — Design Tokens & Base Styles
   ============================================================ */

:root {
  /* Brand palette — preserved from existing site */
  --obsidian-black: #0F1A20;
  --northern-navy: #1E2F45;
  --primary-navy: #263840;
  --steel-gray: #6C727A;
  --frost-white: #F8F7F3;
  --ice-silver: #D8D9D6;
  --aurora-blue: #3B77A3;
  --aurora-blue-hover: #4F8FBF;
  --aurora-blue-soft: rgba(59, 119, 163, 0.12);

  /* Pass 4 — expanded palette (boutique-consulting warmth) */
  --deep-navy: #152436;
  --warm-gold: #C9A55C;
  --warm-gold-soft: rgba(201, 165, 92, 0.14);
  --warm-gold-hover: #D9B776;
  --slate-mist: #5A6E7F;
  --warm-cream: #EDEAE2;
  --warm-cream-deep: #E4DFD4;

  /* Dark theme (default) — semantic roles */
  --color-bg: var(--obsidian-black);
  --color-surface: #131e25;
  --color-surface-2: #17222a;
  --color-surface-offset: #1b2730;
  --color-border: rgba(216, 217, 214, 0.10);
  --color-border-strong: rgba(216, 217, 214, 0.20);
  --color-divider: rgba(216, 217, 214, 0.08);
  --color-text: #ECEAE4;
  --color-text-muted: #A8ADB3;
  --color-text-faint: #6C727A;
  --color-text-inverse: var(--obsidian-black);
  --color-primary: var(--aurora-blue);
  --color-primary-hover: var(--aurora-blue-hover);
  --color-primary-soft: var(--aurora-blue-soft);
  --color-eyebrow: #8FA8BD;
  --color-on-primary: #ffffff;

  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.70rem + 0.20vw, 0.8125rem);
  --text-sm:   clamp(0.8125rem, 0.78rem + 0.18vw, 0.9375rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.0625rem);
  --text-md:   clamp(1.0625rem, 1rem    + 0.35vw, 1.1875rem);
  --text-lg:   clamp(1.25rem,  1.1rem  + 0.5vw,  1.5rem);
  --text-xl:   clamp(1.625rem, 1.35rem + 1vw,   2.25rem);
  --text-2xl:  clamp(2rem,     1.5rem  + 2vw,   3rem);
  --text-3xl:  clamp(2.5rem,   1.6rem  + 3.2vw, 4.25rem);
  --text-hero: clamp(2.75rem,  1.5rem  + 4.5vw, 5rem);

  /* Spacing — 4px base */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius — restrained */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;

  /* Layout widths */
  --content-narrow: 720px;
  --content-default: 1080px;
  --content-wide: 1240px;

  /* Motion */
  --transition: 220ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 420ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows — dark-mode friendly */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.32);
  --shadow-lg: 0 24px 48px rgba(0, 0, 0, 0.4);

  /* Fonts */
  --font-display: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;

  /* Header */
  --header-height: 72px;
}

/* Light theme — clean and editorial */
[data-theme="light"] {
  --color-bg: var(--frost-white);
  --color-surface: #ffffff;
  --color-surface-2: #FCFBF7;
  --color-surface-offset: #EFECE5;
  --color-border: rgba(15, 26, 32, 0.10);
  --color-border-strong: rgba(15, 26, 32, 0.20);
  --color-divider: rgba(15, 26, 32, 0.08);
  --color-text: var(--obsidian-black);
  --color-text-muted: #4A555D;
  --color-text-faint: var(--steel-gray);
  --color-text-inverse: var(--frost-white);
  --color-primary: #2565A1; /* slightly deeper for AA contrast on light */
  --color-primary-hover: #1E5286;
  --color-primary-soft: rgba(37, 101, 161, 0.10);
  --color-eyebrow: #476179;
  --color-on-primary: #ffffff;
  --shadow-sm: 0 1px 2px rgba(15, 26, 32, 0.06);
  --shadow-md: 0 6px 18px rgba(15, 26, 32, 0.08);
  --shadow-lg: 0 18px 36px rgba(15, 26, 32, 0.12);
}

/* ============================================================
   Reset & Base
   ============================================================ */

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

html {
  -webkit-text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-4));
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition), color var(--transition);
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul[role="list"], ol[role="list"] { list-style: none; }

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.15;
  text-wrap: balance;
  color: var(--color-text);
}

p { text-wrap: pretty; }

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

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

::selection {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   Layout primitives
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 5vw, var(--space-12));
}

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

.section {
  padding-block: clamp(var(--space-16), 9vw, var(--space-32));
}

.section--tight {
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}

.section--dark {
  background: var(--obsidian-black);
  color: #ECEAE4;
}
.section--dark h1, .section--dark h2, .section--dark h3 { color: #ECEAE4; }
.section--dark .eyebrow { color: #8FA8BD; }
.section--dark .text-muted { color: #A8ADB3; }

.section--navy {
  background: linear-gradient(180deg, #16242F 0%, #1E2F45 100%);
  color: #ECEAE4;
}
.section--navy h1, .section--navy h2, .section--navy h3 { color: #ECEAE4; }
.section--navy .eyebrow { color: #8FA8BD; }
.section--navy .text-muted { color: #A8ADB3; }

.section--light {
  background: var(--frost-white);
  color: var(--obsidian-black);
}
.section--light h1, .section--light h2, .section--light h3 { color: var(--obsidian-black); }
.section--light .eyebrow { color: #476179; }
.section--light .text-muted { color: #4A555D; }

/* ============================================================
   Typography utilities
   ============================================================ */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-eyebrow);
  margin-bottom: var(--space-5);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.h-display {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.04;
}

.h-page {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.08;
}

.h-section {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.12;
}

.h-card {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  letter-spacing: -0.005em;
}

.lead {
  font-size: var(--text-md);
  line-height: 1.6;
  color: var(--color-text-muted);
  max-width: 65ch;
}

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

.pull-quote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 300;
  font-style: italic;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--color-text);
  border-left: 2px solid var(--color-primary);
  padding-left: var(--space-6);
  margin-block: var(--space-8);
  max-width: 60ch;
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-on-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn--secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: transparent;
  padding: var(--space-2) var(--space-3);
}
.btn--ghost:hover { color: var(--color-primary); }

.btn--lg { padding: var(--space-4) var(--space-8); font-size: var(--text-sm); }

.btn .arrow {
  display: inline-block;
  transition: transform var(--transition);
}
.btn:hover .arrow { transform: translateX(4px); }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

/* ============================================================
   Header / Navigation
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(15, 26, 32, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), border-color var(--transition);
}

[data-theme="light"] .site-header {
  background: rgba(248, 247, 243, 0.85);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 5vw, var(--space-12));
}

.site-logo {
  display: flex;
  align-items: center;
  height: 64px;
}
@media (max-width: 880px) {
  .site-logo { height: 48px; }
}

.site-logo img {
  height: 100%;
  width: auto;
}

[data-theme="light"] .site-logo .logo-dark { display: block; }
[data-theme="light"] .site-logo .logo-light { display: none; }
[data-theme="dark"] .site-logo .logo-dark,
:root:not([data-theme="light"]) .site-logo .logo-dark { display: none; }
[data-theme="dark"] .site-logo .logo-light,
:root:not([data-theme="light"]) .site-logo .logo-light { display: block; }

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.primary-nav__link {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
  border-radius: var(--radius-xs);
  position: relative;
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: var(--space-4);
  right: var(--space-4);
  bottom: 4px;
  height: 1px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.primary-nav__link:hover,
.primary-nav__link[aria-current="page"] {
  color: var(--color-primary);
}

.primary-nav__link:hover::after,
.primary-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--color-text);
  transition: color var(--transition), background var(--transition);
}
.theme-toggle:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  color: var(--color-text);
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--transition), opacity var(--transition);
}
body.nav-open .menu-toggle span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
body.nav-open .menu-toggle span:nth-child(2) { opacity: 0; }
body.nav-open .menu-toggle span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@media (max-width: 880px) {
  .menu-toggle { display: flex; }
  .primary-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    height: calc(100vh - var(--header-height));
    height: calc(100dvh - var(--header-height));
    min-height: calc(100vh - var(--header-height));
    background: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-6) var(--space-6) var(--space-12);
    gap: var(--space-2);
    transform: translateX(100%);
    transition: transform var(--transition-slow), visibility 0s linear var(--duration-slow);
    border-top: 1px solid var(--color-border);
    overflow-y: auto;
    z-index: 90;
    visibility: hidden;
    pointer-events: none;
  }
  body.nav-open .primary-nav { transform: translateX(0); visibility: visible; pointer-events: auto; transition: transform var(--transition-slow), visibility 0s; }
  body.nav-open { overflow: hidden; }
  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .primary-nav__link {
    padding: var(--space-4);
    font-size: var(--text-sm);
    border-bottom: 1px solid var(--color-border);
  }
  .primary-nav__link::after { display: none; }
  .header-actions .theme-toggle { display: none; }
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  background: var(--obsidian-black);
  color: #ECEAE4;
  padding-block: var(--space-20) var(--space-8);
  border-top: 1px solid rgba(216, 217, 214, 0.08);
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-16);
  max-width: 1180px;
  margin-inline: auto;
  justify-content: center;
}
.footer-brand { padding-right: 0; }

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-5);
}

.footer-brand__logo {
  width: 130px;
  height: auto;
  display: block;
  margin-inline: auto;
}

.footer-brand__tagline {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #8FA8BD;
}

.footer-brand__desc {
  font-size: var(--text-sm);
  color: #A8ADB3;
  max-width: 36ch;
  margin-inline: auto;
  line-height: 1.6;
}

.footer-col__heading {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #ECEAE4;
  margin-bottom: var(--space-5);
}

.footer-col__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-col__list a {
  font-size: var(--text-sm);
  color: #A8ADB3;
  transition: color var(--transition);
}
.footer-col__list a:hover { color: var(--aurora-blue-hover); }

.footer-social a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: #A8ADB3;
}
.footer-social a:hover { color: var(--aurora-blue-hover); }

.site-footer__bottom {
  border-top: 1px solid rgba(216, 217, 214, 0.08);
  padding-top: var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  font-size: var(--text-xs);
  color: var(--steel-gray);
  letter-spacing: 0.08em;
}

.site-footer__bottom .copyright { text-transform: uppercase; letter-spacing: 0.15em; }

@media (max-width: 880px) {
  .site-footer__top {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
  }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 520px) {
  .site-footer__top { grid-template-columns: 1fr; }
}

/* ============================================================
   Cards
   ============================================================ */

.card-grid {
  display: grid;
  gap: var(--space-6);
}

.card-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 980px) {
  .card-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 620px) {
  .card-grid--2, .card-grid--3, .card-grid--4 { grid-template-columns: 1fr; }
}

.card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
}

.card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
}

.card__label {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  letter-spacing: -0.005em;
  line-height: 1.25;
}

.card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================================
   Misc utilities
   ============================================================ */

.divider {
  height: 1px;
  background: var(--color-divider);
  border: 0;
  margin-block: var(--space-12);
}

.section-intro {
  max-width: 68ch;
  margin-bottom: var(--space-12);
}

.section-intro__lead {
  font-size: var(--text-md);
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-top: var(--space-5);
}

.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-8), 6vw, var(--space-16));
  align-items: start;
}
@media (max-width: 880px) {
  .grid-2col { grid-template-columns: 1fr; }
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  z-index: 100;
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
}
.skip-link:focus { top: var(--space-4); }