/* ============================================================
   PN Tech Advisory — design tokens & components
   ============================================================ */

:root,
[data-theme='light'] {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  /* Spacing */
  --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;

  /* Surfaces — cool slate neutrals */
  --color-bg: #f5f6f6;
  --color-surface: #fafbfb;
  --color-surface-2: #eff1f2;
  --color-divider: #e0e3e5;
  --color-border: #d0d5d8;

  /* Text — ink */
  --color-text: #1b2530;
  --color-text-muted: #5d6873;
  --color-text-faint: #9aa4ad;
  --color-text-inverse: #f5f7f8;

  /* Accent — deep steel blue */
  --color-primary: #23586f;
  --color-primary-hover: #1a4557;
  --color-primary-active: #133441;
  --color-primary-highlight: #d4e0e6;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px oklch(0.25 0.02 240 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.25 0.02 240 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.25 0.02 240 / 0.12);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1160px;

  --font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Helvetica Neue', sans-serif;
}

[data-theme='dark'] {
  --color-bg: #10161b;
  --color-surface: #151d23;
  --color-surface-2: #1a232a;
  --color-divider: #232d35;
  --color-border: #33404a;

  --color-text: #cbd4da;
  --color-text-muted: #8b969f;
  --color-text-faint: #5c666f;
  --color-text-inverse: #141b21;

  --color-primary: #74abc2;
  --color-primary-hover: #8fbdd1;
  --color-primary-active: #5d97af;
  --color-primary-highlight: #22323c;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.45);
}

/* ============================================================
   Layout scaffolding
   ============================================================ */

.container {
  width: min(var(--content-wide), 100% - clamp(var(--space-5), 6vw, var(--space-16)) * 2);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  text-decoration: none;
  transform: translateY(-200%);
}
.skip-link:focus {
  transform: translateY(0);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid oklch(from var(--color-border) l c h / 0.5);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  text-decoration: none;
  min-height: 44px;
}
.brand:hover {
  color: var(--color-primary);
}

.brand__mark {
  flex: none;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.site-nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-3);
}
.site-nav__link:hover {
  color: var(--color-text);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

@media (max-width: 640px) {
  .site-nav__link {
    display: none;
  }
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  padding-block: clamp(var(--space-20), 14vh, var(--space-32)) clamp(var(--space-16), 10vh, var(--space-24));
  position: relative;
  overflow: hidden;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, oklch(from var(--color-border) l c h / 0.35) 1px, transparent 1px),
    linear-gradient(to bottom, oklch(from var(--color-border) l c h / 0.35) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 0%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 0%, black 30%, transparent 75%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  max-width: 52rem;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}
.hero__eyebrow::before {
  content: '';
  width: var(--space-8);
  height: 1px;
  background: currentColor;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}

.hero__sub {
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text-muted);
  max-width: 42rem;
  margin-bottom: var(--space-10);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.01em;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
}
.btn--primary:active {
  background: var(--color-primary-active);
}

.btn--ghost {
  color: var(--color-text);
  border: 1px solid var(--color-border);
  background: transparent;
}
.btn--ghost:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface-2);
}

.btn svg {
  flex: none;
}

/* ============================================================
   Section scaffolding
   ============================================================ */

.section-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  margin-bottom: clamp(var(--space-10), 6vw, var(--space-16));
}

.section-head__kicker {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  flex: none;
}

.section-head__rule {
  flex: 1;
  height: 1px;
  background: var(--color-divider);
}

/* ============================================================
   Pillars — numbered editorial rows
   ============================================================ */

.pillars {
  padding-block: clamp(var(--space-16), 9vw, var(--space-24));
  background: var(--color-surface);
  border-block: 1px solid var(--color-divider);
}

.pillar {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: var(--space-4) var(--space-8);
  padding-block: clamp(var(--space-8), 5vw, var(--space-12));
  border-top: 1px solid var(--color-divider);
}
.pillar:last-child {
  border-bottom: 1px solid var(--color-divider);
}

.pillar__num {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-faint);
  line-height: 1.15;
  padding-top: 0.3rem;
  font-variant-numeric: tabular-nums;
}

.pillar__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
}

.pillar__desc {
  color: var(--color-text-muted);
  max-width: 40rem;
}

.pillar__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.tag {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .pillar {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
  .pillar__num {
    padding-top: 0;
  }
}

/* ============================================================
   About / track record
   ============================================================ */

.about {
  padding-block: clamp(var(--space-16), 9vw, var(--space-24));
}

.about__grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  align-items: start;
}

.about__quote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.01em;
  border: none;
}

.about__quote em {
  font-style: normal;
  color: var(--color-primary);
}

.about__body {
  margin-top: var(--space-6);
  color: var(--color-text-muted);
}

.about__facts {
  display: grid;
  gap: var(--space-6);
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-border) l c h / 0.6);
  border-radius: var(--radius-lg);
}

.fact__value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-primary);
  line-height: 1.1;
}

.fact__label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

@media (max-width: 800px) {
  .about__grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   Contact
   ============================================================ */

.contact {
  padding-block: clamp(var(--space-16), 10vw, var(--space-24));
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
}

.contact__inner {
  max-width: 44rem;
}

.contact__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

.contact__sub {
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

.contact__email {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.contact__email a {
  color: var(--color-text);
  font-weight: 600;
  text-decoration-color: oklch(from var(--color-primary) l c h / 0.5);
  text-underline-offset: 3px;
}
.contact__email a:hover {
  color: var(--color-primary);
}

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

.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-8);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.site-footer__links {
  display: flex;
  gap: var(--space-5);
}

.site-footer__links a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-2);
}
.site-footer__links a:hover {
  color: var(--color-text);
}

/* ============================================================
   Reveal on scroll
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}