:root{
  --bg-dark: #0d0d0d;
  --text-dark: #e0e0e0;
  --accent-green: #00ff9f;
  --accent-yellow: #f5c542;
  --beige-bg: #f6ecd9;
  --beige-text: #222;
}

/* Base dark theme */
body {
  background-color: var(--bg-dark);
  color: var(--text-dark);
  font-family: "Courier New", monospace;
  margin: 0;
  padding: 0;
}

/* Header and layout */
header {
  position: relative;
  text-align: center;
  padding: 0.1rem;
  margin-bottom: 0.5rem;
  margin-top: 2rem;
}

/* Terminal card */
.terminal-card {
  background-color: #111;
  border: 1px solid #333;
  border-radius: 3px;
  width: 75%;
  height: 40%;
  margin: 2rem auto;
  padding: 1rem;
  box-shadow: 0 0 10px #000;
}

.terminal-header {
  background-color: #333;
  padding: 0.5rem;
  display: flex;
  gap: 8px;
}

.dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.red { background: #ff5f56; }
.yellow { background: #ffbd2e; }
.green { background: #27c93f; }

.terminal-body { padding: 1rem; font-size: 1rem; }

.cursor {
  display: inline-block;
  width: 10px;
  height: 1.2rem;
  background: var(--text-dark);
  margin-left: 4px;
  animation: blink 1s steps(1, start) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* Sections and nav */
section, .page-section, #writeups { width: 70%; margin: 2rem auto; padding: 1rem; border-left: 2px solid #333; }
.hidden { display: none; }

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

.writeup-heading { margin: 1rem 0; cursor: pointer; color: var(--accent-green); display: block; }
.writeup-heading:hover { text-decoration: underline; }

/* Title font */
@font-face {
  font-family: 'Chithira';
  src: url('../fonts/chithira.ttf') format('truetype'),
       url('../fonts/chithira.woff') format('woff'),
       url('../fonts/chithira.woff2') format('woff2');
}
h1 { margin: 0; font-size: 15vw; font-weight: bold; font-family: 'Chithira', sans-serif; }

/* Nav menu */
.nav-menu { list-style: none; padding: 0; margin: 0; display: flex; justify-content: center; gap: 1rem; }
.nav-menu li a { color: var(--accent-green); font-weight: bold; transition: color 0.3s ease; }
.nav-menu li a:hover { color: #ffffff; text-decoration: underline; }
.nav-menu li a.active { text-decoration: underline; color: #ffffff; }

/* Home button */
.home-button { position: absolute; top: 1.1rem; left: 1.4rem; color: var(--accent-green); font-weight: bold; text-decoration: none; transition: color 0.3s ease; }
.home-button:hover { color: #ffffff; }

/* Waveform and visualizer */
#waveform { width: 82%; margin: 1rem auto; }
.btn-visualizer {
  display: block; margin: 1rem auto; padding: 0.5rem 1rem;
  background: var(--accent-green); color: #080808; font-family: "Courier New", monospace; font-weight: bold;
  border: none; border-radius: 4px; cursor: pointer; transition: background 0.3s ease;
}
.btn-visualizer:hover { background: #ffffff; color: #000; }

/* Theme toggle */
.theme-toggle { position: absolute; top: 1rem; right: 1.4rem; background: none; border: none; cursor: pointer; font-size: 1rem; color: var(--accent-green); transition: color 0.3s ease; }
.theme-toggle:hover { color: #ffffff; }
.theme-toggle .fas { color: inherit; }

/* Light mode overrides (warm beige) */
body.light-mode {
  background-color: var(--beige-bg);
  color: var(--beige-text);
  transition: background-color 250ms ease, color 250ms ease;
}
body.light-mode .terminal-card { background-color: #fbf7ef; border: 1px solid #ddd; box-shadow: 0 4px 14px rgba(0,0,0,0.08); }
body.light-mode .terminal-header { background-color: #efe7d6; }
body.light-mode a { color: #006699; }
body.light-mode a:hover { color: #003f5c; }
body.light-mode .btn-visualizer { background: var(--accent-yellow); color: #111; }
body.light-mode .btn-visualizer:hover { background: #e0b233; }

/* Light-mode icon colors */
body.light-mode .theme-toggle { color: var(--accent-yellow); }
body.light-mode .home-button { color: var(--accent-yellow); }

/* Ensure icons inherit color */
.theme-toggle .fas, .home-button .fas { color: inherit; }

/* Small helpers */
.responsive-img { max-width: 100%; height: auto; }
.img-rounded { border-radius: 12px; }