/* ============================================================
   THETA — Base: reset, typography primitives, layout shell,
   navigation, buttons, grain, reveal primitives.
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  background: var(--ink-900);
  color: var(--text-on-dark);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

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

button {
  font: inherit;
  cursor: pointer;
}

/* ---- Typography primitives ---- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 640;
  font-optical-sizing: auto;
  letter-spacing: -0.021em;
  line-height: var(--leading-tight);
  text-wrap: balance;
  margin: 0;
}

.eyebrow {
  font-family: var(--font-sans);
  font-size: var(--text-eyebrow);
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
}

.eyebrow--light {
  color: var(--accent-deep);
}

.swiss-tick {
  width: 11px;
  height: 11px;
  position: relative;
  display: inline-block;
}
.swiss-tick::before,
.swiss-tick::after {
  content: "";
  position: absolute;
  background: var(--swiss);
}
.swiss-tick::before {
  top: 3px;
  left: 0;
  width: 11px;
  height: 5px;
}
.swiss-tick::after {
  top: 0;
  left: 3px;
  width: 5px;
  height: 11px;
}

.h-mega {
  font-size: var(--text-mega);
  letter-spacing: -0.03em;
  font-weight: 700;
}
.h-display {
  font-size: var(--text-display);
}
.h2 {
  font-size: var(--text-h2);
}
.h3 {
  font-size: var(--text-h3);
  font-weight: 600;
}

.lead {
  font-size: var(--text-lead);
  line-height: var(--leading-snug);
  color: var(--text-on-dark-muted);
  font-weight: 400;
  max-width: 54ch;
}

.body {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--text-on-dark-muted);
  max-width: var(--maxw-text);
}

.body strong,
.lead strong {
  color: var(--text-on-dark);
  font-weight: 600;
}

.accent-word {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 640;
  color: var(--accent);
}

.numeral {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

::selection {
  background: var(--accent);
  color: var(--ink-900);
}

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

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

.section--light {
  background: var(--ivory-50);
  color: var(--text-on-light);
}
.section--light .body {
  color: var(--text-on-light-muted);
}
.section--light .lead {
  color: var(--text-on-light-muted);
}
.section--light .body strong,
.section--light .lead strong {
  color: var(--text-on-light);
}

/* ---- Grain overlay ---- */
.grain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  background-image: var(--grain-uri);
  opacity: 0.035;
  mix-blend-mode: overlay;
}

/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem var(--gutter);
  transition: background var(--dur) var(--ease-out-quart),
    backdrop-filter var(--dur), padding var(--dur), border-color var(--dur);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: var(--nav-bg);
  backdrop-filter: saturate(140%) blur(18px);
  -webkit-backdrop-filter: saturate(140%) blur(18px);
  border-bottom-color: var(--hairline);
  padding-block: 0.7rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  letter-spacing: 0.02em;
}
.brand-mark {
  width: 42px;
  height: 26px;
  flex: none;
}
/* Serif wordmark echoes the THETA HOLDING logo (mountain arc + classic serif) */
.brand-word {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia,
    "Times New Roman", serif;
  font-weight: 500;
  font-size: 1.2rem;
  letter-spacing: 0.2em;
  color: var(--text-on-dark);
  line-height: 1;
}
.brand-word .sub {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.54rem;
  letter-spacing: 0.44em;
  font-weight: 600;
  color: var(--text-on-dark-faint);
  margin-top: 4px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 0.4rem + 1.4vw, 2.1rem);
}
.nav-links a:not(.btn) {
  font-size: 0.9rem;
  color: var(--text-on-dark-muted);
  letter-spacing: 0.01em;
  transition: color var(--dur-fast);
  position: relative;
}
.nav-links a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  height: 1px;
  width: 0;
  background: var(--accent);
  transition: width var(--dur) var(--ease-out-quart);
}
.nav-links a:not(.btn):hover {
  color: var(--text-on-dark);
}
.nav-links a:not(.btn):hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  width: 44px;
  height: 44px;
  padding: 0;
  position: relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 10px;
  width: 24px;
  height: 1.5px;
  background: var(--text-on-dark);
  transition: transform var(--dur), opacity var(--dur);
}
.nav-toggle span {
  top: 21px;
}
.nav-toggle span::before {
  top: -7px;
}
.nav-toggle span::after {
  top: 7px;
}
.nav.is-open .nav-toggle span {
  background: transparent;
}
.nav.is-open .nav-toggle span::before {
  transform: translateY(7px) rotate(45deg);
}
.nav.is-open .nav-toggle span::after {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Buttons ---- */
.btn {
  --btn-bg: var(--accent);
  --btn-fg: var(--ink-900);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.95rem 1.6rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bg);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.96rem;
  letter-spacing: 0.005em;
  transition: transform var(--dur-fast) var(--ease-out-quart),
    box-shadow var(--dur), background var(--dur), color var(--dur);
  will-change: transform;
}
.btn .arrow {
  transition: transform var(--dur) var(--ease-out-expo);
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px -18px var(--accent-glow);
}
.btn:hover .arrow {
  transform: translateX(5px);
}
.btn:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 3px;
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--text-on-dark);
  border-color: var(--hairline-strong);
}
.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: none;
}
.section--light .btn--ghost {
  --btn-fg: var(--text-on-light);
  border-color: var(--divider-on-light);
}

.btn--lg {
  padding: 1.15rem 2rem;
  font-size: 1.02rem;
}

/* ---- Reveal primitive ---- */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity var(--dur-slow) var(--ease-out-expo),
    transform var(--dur-slow) var(--ease-out-expo);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ---- Footer ---- */
.footer {
  background: var(--ink-950);
  border-top: 1px solid var(--hairline);
  padding-block: clamp(3rem, 2rem + 4vw, 5rem) 2.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
}
.footer h4 {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-on-dark-faint);
  font-weight: 600;
  margin-bottom: 1.1rem;
}
.footer a {
  display: block;
  color: var(--text-on-dark-muted);
  font-size: 0.95rem;
  padding-block: 0.32rem;
  transition: color var(--dur-fast);
}
.footer a:hover {
  color: var(--accent);
}
.footer-legal {
  margin-top: 3rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
  align-items: center;
  color: var(--text-on-dark-faint);
  font-size: 0.82rem;
}

@media (max-width: 900px) {
  .nav-toggle {
    display: block;
  }
  .nav-links {
    position: fixed;
    inset: 0 0 0 auto;
    width: min(82vw, 360px);
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 1.4rem;
    padding: 2rem var(--gutter);
    background: var(--ink-850);
    border-left: 1px solid var(--hairline);
    transform: translateX(100%);
    transition: transform var(--dur) var(--ease-out-expo);
    box-shadow: var(--shadow-float);
  }
  .nav.is-open .nav-links {
    transform: none;
  }
  .nav-links a:not(.btn) {
    font-size: 1.15rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.8rem;
  }
}