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

/* ==========================
   CSS Variables (theme)
   ========================== */
:root {
  --color-bg: #212121;
  --color-text: #c3ff6a;
  --color-accent: #f68c3b;
  --color-link: #6afffa;
  --font-sans: 'Roboto', sans-serif;
  --font-mono: 'Fira Code', monospace;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
}

/* ==========================
   Global body & typography
   ========================== */
body {
  font-family: var(--font-mono);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  font-size: 16px;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

p {
  margin-bottom: var(--spacing-md);
}

/* ==========================
   Links
   ========================== */
a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent);
}

/* ==========================
   Lists
   ========================== */
ul {
  list-style: none;
  padding-left: 0;
}

li {
  font-family: var(--font-mono);
  margin-bottom: var(--spacing-sm);
}

/* ==========================
   Navigation
   ========================== */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
}

nav ul {
  display: flex;
  gap: var(--spacing-md);
}

nav a {
  font-weight: 500;
}

/* ==========================
   Utility Classes
   ========================== */
.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.text-center {
  text-align: center;
}

.mt-md { margin-top: var(--spacing-md); }
.mb-md { margin-bottom: var(--spacing-md); }

/* Header */
.site-header {
  background-color: var(--color-bg);
  border-bottom: 2px solid #a8a8a8;
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo a {
  font-weight: 700;
  font-size: 1.5rem;
  color: #ffffff;
  text-decoration: none;
}

/* Navigation menu */
/* start hidden in mobile */
.menu-toggle {
  display: none;
}

/* normal desktop */
.nav-menu {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}


/* ==========================
   Navigation menu buttons
   ========================== */
.nav-menu a {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 5px; /* pill shape */
  border-width: 2px;
  border-style: solid;
  border-color: var(--color-accent);
  background-color: var(--color-bg);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

.nav-menu a:hover {
  background-color: var(--color-bg);
  transform: scale(1.08);
}

.nav-menu a:active {
  transform: translateY(0);
  background-color: var(--color-accent);
}

/* ====== Mobile ====== */
@media(max-width:768px) {
  nav { position: relative; }
  .menu-toggle {
    display: block;
    font-size: 1.5rem;
    background: none;
    border: none;
    color: var(--color-accent);
    cursor: pointer;
  }

  .nav-menu {
    position: absolute;
    top: 100%;  /* exactly below header */
    right: 0;
    background: var(--color-bg);
    border: 1px solid #a8a8a8;
    border-radius: 8px;
    padding: var(--spacing-sm);
    display: none;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: 2000;
  }

  .nav-menu.open {
    display: flex;      /* revealed when toggled */
  }
}

.typewriter {
  font-family: var(--font-mono), monospace;
  display: inline;
  overflow: hidden;
  white-space: normal;
  border-right: 2px solid;
  width: 0;
}

@keyframes typing {
  from { width: 0 }
  to { width: 100% }
}

@keyframes blink {
  50% { border-color: transparent }
}

.logo-icon {
  width: 250px;
  display: block;
}