/* =============================================
   BJARNI BEN — Global Styles
   =============================================
   Design tokens, reset, typography, layout
   utilities, navigation, footer, and shared
   component styles.
   ============================================= */

/* ----- Custom Properties ----- */
:root {
  /* Palette */
  --color-black: #0a0a0a;
  --color-white: #f5f5f3;
  --color-grey-100: #e8e8e6;
  --color-grey-200: #d0d0cd;
  --color-grey-300: #a8a8a4;
  --color-grey-400: #787874;
  --color-grey-500: #555552;
  --color-grey-600: #333330;
  --color-grey-700: #1e1e1c;
  --color-grey-800: #141413;

  /* Semantic */
  --color-bg: var(--color-black);
  --color-surface: var(--color-grey-800);
  --color-text: var(--color-white);
  --color-text-muted: var(--color-grey-400);
  --color-text-subtle: var(--color-grey-500);
  --color-border: var(--color-grey-700);
  --color-accent: var(--color-white);

  /* Typography */
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --text-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --text-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.9rem);
  --text-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
  --text-lg: clamp(1.1rem, 1rem + 0.5vw, 1.3rem);
  --text-xl: clamp(1.4rem, 1.1rem + 1.5vw, 2rem);
  --text-2xl: clamp(2rem, 1.5rem + 2.5vw, 3.2rem);
  --text-3xl: clamp(2.8rem, 2rem + 4vw, 5.5rem);
  --text-4xl: clamp(3.5rem, 2.5rem + 5vw, 7.5rem);

  --leading-tight: 1.05;
  --leading-snug: 1.2;
  --leading-normal: 1.6;

  --tracking-tight: -0.03em;
  --tracking-normal: 0;
  --tracking-wide: 0.08em;
  --tracking-wider: 0.15em;

  /* Spacing */
  --space-xs: clamp(0.25rem, 0.2rem + 0.25vw, 0.5rem);
  --space-sm: clamp(0.5rem, 0.4rem + 0.5vw, 0.75rem);
  --space-md: clamp(1rem, 0.8rem + 1vw, 1.5rem);
  --space-lg: clamp(1.5rem, 1rem + 2.5vw, 3rem);
  --space-xl: clamp(3rem, 2rem + 5vw, 6rem);
  --space-2xl: clamp(5rem, 3rem + 8vw, 10rem);

  /* Layout */
  --container-max: 1200px;
  --container-padding: clamp(1.25rem, 1rem + 2vw, 3rem);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 200ms;
  --duration-base: 400ms;
  --duration-slow: 700ms;

  /* Misc */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

img {
  height: auto;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

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

:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 3px;
}

::selection {
  background: var(--color-white);
  color: var(--color-black);
}

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

.section-label {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.text-stroke {
  -webkit-text-stroke: 1.5px var(--color-white);
  -webkit-text-fill-color: transparent;
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: 0.9em 2em;
  border-radius: var(--radius-full);
  transition:
    background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background-color: var(--color-white);
  color: var(--color-black);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245, 245, 243, 0.15);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-white);
  border: 1.5px solid var(--color-grey-600);
}

.btn--ghost:hover {
  border-color: var(--color-white);
  transform: translateY(-2px);
}

.btn--lg {
  padding: 1.1em 2.6em;
  font-size: var(--text-sm);
}

/* ----- Navigation ----- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  transition: background-color var(--duration-base) var(--ease-out),
              padding var(--duration-base) var(--ease-out);
}

.site-header--scrolled {
  background-color: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.nav__logo {
  z-index: 1001;
}

.nav__logo-text {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  line-height: 1;
}

.nav__logo-dot {
  color: var(--color-grey-400);
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__logo:hover .nav__logo-dot {
  color: var(--color-white);
}

/* Hamburger */
.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  z-index: 1001;
}

.nav__toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 1px;
  transition:
    transform var(--duration-base) var(--ease-out),
    opacity var(--duration-fast) var(--ease-out);
  transform-origin: center;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.nav__menu {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  background-color: var(--color-black);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-slow) var(--ease-out),
    visibility var(--duration-slow) var(--ease-out);
}

.nav__menu--open {
  opacity: 1;
  visibility: visible;
}

.nav__link {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-white);
  transition: width var(--duration-base) var(--ease-out);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__link--active {
  color: var(--color-white);
}

/* Desktop nav */
@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }

  .nav__menu {
    position: static;
    flex-direction: row;
    gap: var(--space-lg);
    background-color: transparent;
    opacity: 1;
    visibility: visible;
  }

  .nav__link {
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
  }
}

/* ----- Footer ----- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0 var(--space-lg);
}

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

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

.footer__tagline {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-sm);
  font-style: italic;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__link:hover {
  color: var(--color-white);
}

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

.footer__social-link {
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
}

.footer__social-link:hover {
  color: var(--color-white);
  transform: translateY(-2px);
}

.footer__bottom {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

/* ----- Scroll Reveal ----- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.reveal:nth-child(2) { transition-delay: 80ms; }
.reveal:nth-child(3) { transition-delay: 160ms; }
.reveal:nth-child(4) { transition-delay: 240ms; }

/* ----- Reduced Motion ----- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}