* {
  box-sizing: border-box;
}

:root {
  --bg: #0b0c10;
  --card-bg: rgba(15, 15, 15, 0.9);
  --text: #ff003c;
  --accent: #ff003c;
  --box-glow: rgba(255, 0, 60, 0.5);
  --shadow-hover: rgba(255, 0, 60, 0.7);
  --input-bg: #000;
  --text-soft: #ff5e5e;
}

html[data-theme="light"] {
  --bg: #f1f1f1;
  --card-bg: rgba(255, 255, 255, 0.95);
  --text: #222;
  --accent: #222;
  --box-glow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  --input-bg: #fff;
  --text-soft: #333;
}

body {
  font-family: 'Orbitron', sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  transition: background 0.3s, color 0.3s;
  margin: 0;
  padding-bottom: 90px;
}

#particles-js {
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.card-container {
  position: absolute;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  max-width: 850px;
  z-index: 2;
}

.card {
  background: var(--card-bg);
  border: 2px solid var(--accent);
  border-radius: 20px;
  padding: 40px;
  text-align: center;
  box-shadow: 0 0 50px var(--box-glow);
  backdrop-filter: blur(14px);
  transition: transform 0.15s ease, box-shadow 0.3s ease;
}

.card:hover {
  box-shadow: 0 0 60px var(--shadow-hover), 0 0 120px var(--box-glow);
}

.card h1 {
  font-size: 42px;
  margin-bottom: 30px;
  text-shadow: 0 0 20px var(--accent);
}

.card input,
.card pre {
  width: 100%;
  padding: 16px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--input-bg);
  color: var(--accent);
  font-size: 18px;
  margin-bottom: 25px;
  box-shadow: 0 0 10px var(--accent);
}

pre {
  overflow-x: auto;
  white-space: pre-wrap;
}

.byte-count {
  font-size: 22px;
  color: var(--text-soft);
  margin-bottom: 20px;
  text-shadow: 0 0 8px var(--accent);
}

button#copyBtn {
  padding: 12px 20px;
  font-size: 16px;
  font-weight: bold;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 0 10px var(--accent);
}

button#copyBtn:hover {
  background: var(--accent);
  color: var(--input-bg);
  box-shadow: 0 0 20px var(--accent);
}

.footer {
  position: static;
  margin-top: 40px;
  font-size: 18px;
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent);
  font-weight: bold;
  text-align: center;
  padding: 10px 0;
  z-index: 2;
}

.contact-section {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: var(--card-bg);
  padding: 15px 10px;
  box-shadow: 0 -2px 15px var(--box-glow);
  text-align: center;
  z-index: 10;
  color: var(--accent);
  font-weight: bold;
  font-family: 'Orbitron', sans-serif;
  filter: drop-shadow(0 0 8px var(--accent));
}

.contact-section p {
  margin: 0;
  font-size: 18px;
}

.contact-section a {
  color: var(--accent);
  text-decoration: none;
  margin: 0 10px;
  font-size: 20px;
  vertical-align: middle;
  transition: color 0.3s ease;
}

.contact-section a:hover {
  color: #ff5050;
  text-decoration: underline;
}

.brand-logo {
  width: 60px;
  height: 60px;
  position: fixed;
  top: 25px;
  left: 25px;
  z-index: 3;
  background: radial-gradient(circle, var(--accent), #6b0000);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px var(--accent), 0 0 40px var(--accent);
}

.brand-logo img {
  width: 32px;
  height: 32px;
}

#themeToggle {
  position: fixed;
  top: 25px;
  right: 25px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 3;
  padding: 6px;
}

#themeToggle img {
  width: 32px;
  height: 32px;
  filter: drop-shadow(0 0 4px var(--accent));
  transition: filter 0.3s ease;
}

#themeToggle:hover img {
  filter: drop-shadow(0 0 8px var(--accent));
}

@media (max-width: 600px) {
  .card {
    padding: 30px;
  }

  .card h1 {
    font-size: 28px;
  }

  .contact-section a {
    font-size: 18px;
    margin: 0 6px;
  }
}