:root {
  --bg-color: #0f172a;
  --card-bg: rgba(30, 41, 59, 0.7);
  --accent-color: #38bdf8;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --error-color: #ef4444;
  --nav-bg: rgba(15, 23, 42, 0.8);
}

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

html {
  scroll-behavior: smooth;
  font-size: 100%;
}

body {
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  background-image: radial-gradient(circle at top right, #1e293b, #0f172a);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  justify-content: center;

  align-items: center;
  height: 100vh;
}

/* Navigation ==================================== */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1.5rem;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  display: flex;
  justify-content: center;
  gap: 2rem;
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

nav a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

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

/* about section ==================================== */
.card {
  background: var(--card-bg);
  padding: 2rem 3rem 3rem;
  border-radius: 24px;
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  text-align: center;
  max-width: 500px;
  width: 90%;
}

.card h1 {
  margin-bottom: 1rem;
  font-size: 2.5rem;
  background: linear-gradient(90deg, #7b30ff 0%, #8497ff 100%);
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.card p {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1.1rem;
}

.hero-img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin-bottom: 1.5rem;
  border: 4px solid var(--accent-color);
  object-fit: cover;
}

/* 404 page ==================================== */
.container {
  text-align: center;
}

.error {
  font-size: 6rem;
  font-weight: bold;
  color: var(--error-color);
  text-shadow: 0 0 20px rgba(239, 68, 68, 0.3);
}

.message {
  margin-top: 10px;
  font-size: 1.5rem;
  color: var(--text-secondary);
}

.btn {
  margin-top: 1rem;
  display: inline-block;
  padding: 12px 32px;
  border-radius: 12px;
  background: var(--accent-color);
  color: #0f172a;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  margin-left: 10px;
  margin-right: 10px;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0px 2px 15px 0px rgba(56, 189, 248, 0.4);
}

/* Dynamic Content Styling ========================== */

/* Headings within the card */
.card h2 {
  margin: 1.5rem 0 1rem;
  font-size: 1.8rem;
  color: var(--accent-color);
  text-align: left;
}

/* Paragraph spacing */
.card p {
  margin-bottom: 1.2rem;
  text-align: left; /* Better readability for long text */
}

/* Example Block */
.example {
  background: rgba(56, 189, 248, 0.1);
  border-left: 4px solid var(--accent-color);
  padding: 1rem;
  margin: 1.5rem 0;
  border-radius: 0 8px 8px 0;
  text-align: left;
}

.example strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--accent-color);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 1px;
}

/* Note Block */
.note {
  background: rgba(255, 255, 255, 0.05);
  padding: 1rem;
  margin: 1.5rem 0;
  border-radius: 12px;
  font-style: italic;
  border: 1px dashed var(--text-secondary);
  color: var(--text-primary);
}

.note.warning {
  border-color: var(--error-color);
  background: rgba(239, 68, 68, 0.1);
  color: #fca5a5;
}

.note.info {
  border-color: var(--accent-color);
  background: rgba(56, 189, 248, 0.1);
}

/* Lists */
ul,
ol {
  margin: 1rem 0 1.5rem 1.5rem;
  text-align: left;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.5rem;
}

/* Image Block */
.image-block {
  margin: 2rem 0;
}

.image-block img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.caption {
  font-size: 0.85rem;
  margin-top: 0.5rem;
  color: var(--text-secondary);
  text-align: center !important;
}

/* Blockquote */
blockquote {
  border-left: 4px solid #818cf8;
  padding: 0.5rem 0 0.5rem 1.5rem;
  margin: 1.5rem 0;
  font-size: 1.2rem;
  text-align: left;
  background: hsla(230, 50%, 50%, 0.1);
  border-radius: 0px 12px 0px;
}

hr + blockquote {
  margin-top: 0;
}

hr:has(+ blockquote) {
  margin-bottom: 1.2rem;
}

blockquote footer {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Divider */
hr {
  border: 0;
  height: 1px;
  background: linear-gradient(
    to right,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  margin: 2rem 0;
}

/* Fix for long cards: allow scrolling if content exceeds height */
body {
  height: auto;
  min-height: 100vh;
  padding: 100px 0 50px; /* Space for fixed nav */
}

.card {
  max-width: 700px; /* Increased width for better content display */
}

/* Code Container ============================ */
.code-container {
  margin: 20px 0;
  border-radius: 12px;
  overflow: hidden;
  background: #1e1e1e;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.code-header + pre[class*="language-"] {
  background: #151515;
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 0;
  text-align: left;
  font-size: 0.7rem;
  /* border: 1px solid rgba(255, 255, 255, 0.1); */
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #2d2d2d;
  padding: 8px 12px;
  font-size: 0.85rem;
  color: #ccc;
}

.code-header button {
  background: #444;
  border: none;
  color: white;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
}

.code-header button:hover {
  background: #666;
}

pre {
  margin: 0;
  padding: 15px;
  overflow-x: auto;
}

/* media queries */
@media (max-width: 768px) {
  html {
    font-size: 95%;
  }
}
@media (max-width: 480px) {
  html {
    font-size: 90%;
  }
  .code-header button {
    font-size: 0.6rem;
    letter-spacing: 1px;
  }
}