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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
  hanging-punctuation: first last;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
}

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; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; font-family: var(--font-display); }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }

::selection { background: oklch(from var(--color-accent) l c h / 0.2); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: var(--radius-sm); }
button { cursor: pointer; background: none; border: none; }

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

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

/* ===== LAYOUT UTILITIES ===== */
.container {
  width: 100%;
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-12));
}
.container--wide { max-width: var(--content-wide); }
.container--narrow { max-width: var(--content-narrow); }

section { padding-block: clamp(var(--space-12), 8vw, var(--space-24)); }

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

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.01em;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border: 1.5px solid var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-border);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

/* ===== BADGE ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.2rem var(--space-3);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full, 9999px);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ===== DIVIDER ===== */
hr { border: none; border-top: 1px solid var(--color-divider); }

/* ===== NAV ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: var(--space-8);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}
.nav-logo:hover { color: var(--color-primary); }
.nav-logo-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}
.nav-logo-text span { color: var(--color-text-muted); font-weight: 400; }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}
.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
  padding-block: var(--space-2);
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a.active { color: var(--color-primary); }

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

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: all var(--transition);
}
.theme-toggle:hover { background: var(--color-surface-offset); color: var(--color-text); }

/* Mobile nav */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: var(--space-2);
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text);
}
.nav-hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: all var(--transition);
  border-radius: 2px;
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  background: var(--color-bg);
  padding: 76px var(--space-6) var(--space-8);
  z-index: 150;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  will-change: transform;
}
.mobile-nav a {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
  display: block;
  text-decoration: none;
}
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav.open { display: flex; }

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn { display: none; }
  .nav-hamburger { display: flex; }
  .nav-actions { gap: var(--space-2); }
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--color-primary);
  color: #fff;
  padding-block: var(--space-12);
  margin-top: auto;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-12);
}
.footer-brand .logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-3);
}
.footer-brand p { font-size: var(--text-sm); opacity: 0.75; max-width: 28ch; line-height: 1.6; }
.footer-col h4 { font-size: var(--text-sm); font-weight: 600; opacity: 0.6; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: var(--space-4); font-family: var(--font-body); }
.footer-col a { display: block; font-size: var(--text-sm); opacity: 0.8; margin-bottom: var(--space-2); transition: opacity var(--transition); color: #fff; }
.footer-col a:hover { opacity: 1; color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.15); margin-top: var(--space-10); padding-top: var(--space-6); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-4); }
.footer-bottom p, .footer-bottom a { font-size: var(--text-xs); opacity: 0.6; color: #fff; }
.footer-bottom a:hover { opacity: 1; color: #fff; }

@media (max-width: 768px) {
  .footer-inner { grid-template-columns: 1fr; gap: var(--space-8); }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== PAGE HERO ===== */
.page-hero {
  background: var(--color-primary);
  color: #fff;
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
}
.page-hero h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-4);
}
.page-hero p {
  font-size: var(--text-lg);
  opacity: 0.8;
  max-width: 52ch;
}

/* ===== PROSE ===== */
.prose h2 { font-size: var(--text-xl); margin-top: var(--space-10); margin-bottom: var(--space-4); color: var(--color-primary); }
.prose h3 { font-size: var(--text-lg); margin-top: var(--space-8); margin-bottom: var(--space-3); }
.prose p { margin-bottom: var(--space-4); }
.prose ul, .prose ol { margin-bottom: var(--space-4); padding-left: var(--space-6); }
.prose li { margin-bottom: var(--space-2); }
.prose strong { font-weight: 600; color: var(--color-text); }
.prose a { text-decoration: underline; text-underline-offset: 3px; }

/* ===== CARD ===== */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: all var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); border-color: var(--color-primary-highlight); }

/* ===== LANGUAGE TOGGLE ===== */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: var(--text-xs);
  font-weight: 500;
  margin-right: var(--space-2);
}
.lang-toggle a, .lang-toggle span {
  padding: 0.2rem var(--space-2);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all var(--transition);
  line-height: 1;
}
.lang-toggle .lang-active {
  background: var(--color-primary);
  color: #fff;
}
.lang-toggle a {
  color: var(--color-text-muted);
}
.lang-toggle a:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}