@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100;300;400;700&display=swap');

:root {
  /* Font Family & Weights */
  --font-main: 'Inter', sans-serif;
  --weight-thin: 100;
  --weight-light: 300;
  --weight-regular: 400;
  --weight-bold: 700;

  /* Palette Constraints */
  --clr-canvas: #f8f9fa;
  /* Soft Bone-White */
  --clr-ink: #1a1d20;
  /* Ink Charcoal */
  --clr-accent: #2563eb;
  /* Cobalt Blue */
  --clr-muted: #e5e7eb;
  /* Soft Gray */

  /* Neo-brutalism Structural Tokens */
  --border-width: 3px;
  --border: var(--border-width) solid var(--clr-ink);
  --shadow-offset: 5px;
  --shadow-offset-hover: 7px;
  --shadow: var(--shadow-offset) var(--shadow-offset) 0px var(--clr-ink);
  --shadow-hover: var(--shadow-offset-hover) var(--shadow-offset-hover) 0px var(--clr-ink);

  /* Layout Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --max-width: 1200px;
}

html {
  scroll-behavior: smooth;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--clr-canvas);
  color: var(--clr-ink);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Typography Base */
h1,
h2,
h3,
h4 {
  font-weight: var(--weight-regular);
  color: var(--clr-ink);
  line-height: 1.2;
}

p {
  font-weight: var(--weight-regular);
  color: var(--clr-ink);
}

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

/* Layout Elements */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Header & Navigation */
#global-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--clr-canvas);
  border-bottom: var(--border);
}

.nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-logo {
  font-weight: var(--weight-bold);
  font-size: 1.5rem;
  letter-spacing: -0.05em;
  padding: var(--space-xs) var(--space-sm);
  border: var(--border-width) solid transparent;
  transition: all 0.2s ease;
}

.nav-logo:hover {
  border: var(--border);
  background-color: var(--clr-muted);
  transform: translate(-2px, -2px);
  box-shadow: 3px 3px 0px var(--clr-ink);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
}

.nav-link {
  font-size: 1rem;
  font-weight: var(--weight-regular);
  padding: var(--space-xs) var(--space-sm);
  border: var(--border-width) solid transparent;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  border: var(--border);
  background-color: var(--clr-muted);
  transform: translate(-2px, -2px);
  box-shadow: 3px 3px 0px var(--clr-ink);
}

/* Neo-brutalism UI components */
.stark-card {
  background-color: var(--clr-canvas);
  border: var(--border);
  box-shadow: var(--shadow);
  padding: var(--space-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stark-card.interactive:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.stark-btn {
  display: inline-block;
  font-size: 1rem;
  font-weight: var(--weight-bold);
  color: var(--clr-canvas);
  background-color: var(--clr-accent);
  padding: var(--space-sm) var(--space-md);
  border: var(--border);
  box-shadow: var(--shadow);
  text-align: center;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.stark-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.stark-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--clr-ink);
}

.stark-btn--secondary {
  background-color: var(--clr-muted);
  color: var(--clr-ink);
}

/* Placeholder components */
.stark-placeholder {
  border: 2px dashed var(--clr-ink);
  background-color: var(--clr-canvas);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-lg);
}

.stark-placeholder--sm {
  padding: var(--space-sm) var(--space-md);
  gap: 4px;
}

.stark-placeholder-icon {
  width: 36px;
  height: 36px;
  border: 2px dashed var(--clr-ink);
  border-radius: 4px;
  position: relative;
}

.stark-placeholder-icon::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  border: 2px solid var(--clr-ink);
  transform: translate(-50%, -50%);
}

.stark-placeholder-label {
  font-size: 0.9rem;
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Badge System */
.badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.8rem;
  font-weight: var(--weight-bold);
  padding: 0.25rem 0.5rem;
  background-color: var(--clr-canvas);
  border: 2px solid var(--clr-ink);
  border-radius: 0;
  text-transform: uppercase;
  margin-right: var(--space-xs);
  margin-bottom: var(--space-xs);
}

.badge.accent {
  background-color: var(--clr-accent);
  color: var(--clr-canvas);
}

.badge.muted {
  background-color: var(--clr-muted);
}

/* Language Switcher */
.lang-btn {
  background-color: var(--clr-canvas);
  border: var(--border);
  padding: 0 var(--space-sm);
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-main);
  font-weight: var(--weight-bold);
  font-size: 0.9rem;
  cursor: pointer;
  box-shadow: 3px 3px 0px var(--clr-ink);
  transition: all 0.1s ease;
}

.lang-btn:hover {
  background-color: var(--clr-muted);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px var(--clr-ink);
}

.lang-btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px var(--clr-ink);
}

/* Navigation Controls Group */
.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Burger Button */
.burger-btn {
  display: none;
  /* Hidden on desktop */
  background-color: var(--clr-canvas);
  border: var(--border);
  width: 42px;
  height: 42px;
  cursor: pointer;
  box-shadow: 3px 3px 0px var(--clr-ink);
  transition: all 0.1s ease;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  padding: 0;
}

.burger-btn:hover {
  background-color: var(--clr-muted);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px var(--clr-ink);
}

.burger-btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px var(--clr-ink);
}

.burger-bar {
  display: block;
  width: 18px;
  height: 3px;
  background-color: var(--clr-ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Burger Animate to X on Open */
.burger-btn.open .burger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.burger-btn.open .burger-bar:nth-child(2) {
  opacity: 0;
}

.burger-btn.open .burger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

section {
  scroll-margin-top: 70px;
  /* Account for sticky header height */
}

/* Section Containers */
.section-container {
  padding: var(--space-xl) 0;
  border-bottom: var(--border);
}

.section-container:last-of-type {
  border-bottom: none;
}

.section-title {
  font-size: 2rem;
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-lg);
  display: inline-block;
  border-bottom: var(--border-width) solid var(--clr-accent);
  padding-bottom: var(--space-xs);
}

/* Footer layout */
footer {
  background-color: var(--clr-muted);
  border-top: var(--border);
  padding: var(--space-lg) 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.footer-links {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.footer-link {
  font-size: 0.9rem;
  font-weight: var(--weight-bold);
  border-bottom: 2px solid transparent;
  padding: 2px;
}

.footer-link:hover {
  border-bottom-color: var(--clr-ink);
}

.footer-text {
  font-size: 0.85rem;
}

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


@media (min-width: 992px) and (max-width: 1100px) {
  .nav-menu {
    gap: var(--space-sm);
  }

  .nav-link {
    font-size: 0.95rem;
    padding: var(--space-xs) 0.5rem;
  }
}

@media (max-width: 991px) {
  .nav-bar {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    height: 70px;
  }

  .nav-logo {
    font-size: 1.4rem;
    padding: var(--space-xs) var(--space-sm);
  }

  .burger-btn {
    display: flex;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: calc(100% + 5px);
    /* just below the border of the header */
    right: var(--space-md);
    background-color: var(--clr-canvas);
    border: var(--border);
    box-shadow: var(--shadow);
    min-width: 220px;
    z-index: 1000;
    padding: var(--space-sm);
    gap: var(--space-xs);
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu li:last-child {
    position: static;
  }

  .nav-link {
    display: block;
    font-size: 1rem;
    padding: var(--space-xs) var(--space-sm);
    text-align: center;
  }

  #nav-link-home {
    display: none;
  }
}