:root {
  --bg-color: #f4f4f9;
  --text-color: #333;
  --heading-color: #1a1a1a;
  --subheading-color: #555;
  --card-bg: #ffffff;
  --card-border: #ddd;
  --card-hover-shadow: rgba(13, 64, 109, 0.15);
  --link-color: #150d6d; 
  --link-hover-color: #1565c0; 
  --secondary-text: #444;

  --icon-bg: #e0e0e0;
  --icon-color: #333;
  --icon-hover-color: #fff;

  --github-bg: #000;
  --leetcode-bg: #f89f1b;
  --linkedin-bg: #0a66c2;

  --font-family: "IBM Plex Mono", monospace;
  --font-size-base: 1rem;
  --font-size-sm: 0.95rem;
  --font-size-lg: 5.0rem;
  --font-size-md: 1.2rem;

  --padding-base: 2rem;
  --card-radius: 8px;
}

html.dark {
  --bg-color: #1e1e1e;
  --text-color: #d4d4d4;
  --heading-color: #ffb347; /* mellow orange-yellow */
  --subheading-color: #ff9f1a; /* bright orange */
  --card-bg: #2a2a2a;
  --card-border: #444;
  --card-hover-shadow: rgba(255, 239, 97, 0.25); /* warm orange glow */
  --link-color: #ffdf87; /* soft yellow */
  --link-hover-color: #ffb347; /* mellow orange */
  --secondary-text: #bbbbbb;

  --icon-bg: #3a3a3a;
  --icon-color: #d4d4d4;
}

/* Reset and Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  padding: var(--padding-base);
}

/* Header */
header {
  margin-bottom: 2rem;
  text-align: center;
}

header h1 {
  font-size: var(--font-size-lg);
  color: var(--heading-color);
}



header h4 {
  font-size: var(--font-size-md);
  color: var(--subheading-color);
}

section {
  max-width: 800px;
  margin: 0 auto 2rem auto;
  padding: 1rem;
}

p {
  margin-bottom: 1rem;
  font-family: 'Segoe UI', Verdana, sans-serif;
  font-size: var(--font-size-base);
  color: var(--text-color);
}

ul {
  list-style-type: none;
  padding-left: 0;
}

li {
  background: var(--card-bg);
  border-radius: var(--card-radius);
  padding: 1rem;
  margin-bottom: 1rem;
  transition: box-shadow 0.2s ease, background-color 0.3s;
}

li:hover {
  box-shadow: 0 4px 12px var(--card-hover-shadow);
}

li a {
  font-weight: bold;
  color: var(--link-color);
  text-decoration: none;
}

li a:hover {
  text-decoration: underline;
}

li p {
  margin-top: 0.5rem;
  font-size: var(--font-size-sm);
  color: var(--secondary-text);
}

.social-buttons {
  text-align: center;
  margin-bottom: 2rem;
  animation: rest-in 1.8s ease-out forwards;
  animation-delay: 1.8s;
  opacity: 0;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin: 0 0.5rem;
  background-color: var(--icon-bg);
  color: var(--icon-color);
  border-radius: 50%;
  font-size: 1.4rem;
  text-decoration: none;
  transition: background-color 0.3s ease, transform 0.2s ease, color 0.3s ease;
}

.icon-button:hover {
  background-color: var(--link-color);
  color: var(--icon-hover-color);
  transform: scale(1.1);
}

.icon-button.github:hover {
  background-color: var(--github-bg);
}

.icon-button.leetcode:hover {
  background-color: var(--leetcode-bg);
}

.icon-button.linkedin:hover {
  background-color: var(--linkedin-bg);
}

.icon-button.mode {
  background-color: var(--card-bg);
  width: 60px;
  height: 60px;
  border-radius: var(--card-radius);
}

.icon-button.mode:hover{
  background-color: var(--link-color);
}

.link-container {
  position: absolute;
  bottom: 5%;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 5rem;
  justify-content: center;
  background: var(--card-bg);
  border-radius: var(--card-radius);
  padding: 1rem;
  margin-bottom: 1rem;
  animation: rest-in 1.8s ease-out forwards;
  animation-delay: 2.2s;
  opacity: 0;
}

@keyframes rest-in {
    to {
      opacity: 1;
    }
}

/*intro*/
.intro-container {
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      height: 100vh;
      text-align: center;
    }

.intro-title {
    opacity: 0.5;
    filter: blur(10px);
    animation: focusIn 1.8s ease-out forwards; 
    animation-delay: 0.5s;
    font-size: 6rem;
    margin: 0rem;
}
@keyframes focusIn {
    to {
      filter: blur(0);
      opacity: 1;
    }
}

.intro-subtitle {
    clip-path: inset(0 100% 0 0);
    animation: revealText 2s ease-out forwards;
    animation-delay: 1.2s;
    font-size: 1.5rem;
    margin-top: 0.5rem;
}
@keyframes revealText {
    to {
      clip-path: inset(0 0 0 0);
    }
}

.root-link {
  color: inherit;
  text-decoration: none;
  border-left: 2px solid var(--heading-color);
  padding: 4px 8px;
  display: inline-block;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.project-card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 1.25rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 18px var(--card-hover-shadow);
}

.project-card a {
  color: var(--link-color);
  text-decoration: none;
}

.project-card a:hover {
  text-decoration: underline;
  /* box-shadow: 0 4px 12px var(--card-hover-shadow); */
}

/* Tags */
.tags {
  margin-bottom: 0.5rem;
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.2em 0.6em;
  margin-right: 0.4em;
  margin-bottom: 0.3em;
  border-radius: 1em;
  font-weight: 500;
  color: white;
  background-color: #777; /* fallback */
}

.tag.c        { background-color: #5e97d0; }
.tag.cpp      { background-color: #004482; }
.tag.rust     { background-color: #dea584; }
.tag.java     { background-color: #b07219; }
.tag.js       { background-color: #f0db4f; color: #000; }
.tag.react    { background-color: #61dafb; color: #000; }
.tag.kicad    { background-color: #295f8a; }