/* --- CSS VARIABLES & BASIC SETUP --- */
:root {
  --bg: #04060c;
  --primary: #5865f2;
  --primary-light: #7983f3;
  --accent-gradient: linear-gradient(45deg, #5865f2, #00f5a7);
  --glass-bg: rgba(15, 20, 43, 0.5);
  --text: #e6f1ff;
  --subtext: #8892b0;
  --border: rgba(136, 146, 176, 0.2);
  --shadow: rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Space Grotesk', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* --- MOVING BLUR BALL BACKGROUND --- */
.blur-ball-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}
.blur-ball {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}
.blur-ball:nth-child(1) {
  width: 200px;
  height: 200px;
  background-color: var(--primary);
  animation: move-ball-1 15s infinite alternate ease-in-out;
}
.blur-ball:nth-child(2) {
  width: 200px;
  height: 200px;
  background-color: #00f5a7;
  animation: move-ball-2 15s infinite alternate ease-in-out;
}

@keyframes move-ball-1 {
  0%   { transform: translate(10vw, 10vh); }
  40%  { transform: translate(40vw, 30vh); }
  70%  { transform: translate(60vw, 60vh); }
  100% { transform: translate(70vw, 80vh); }
}

@keyframes move-ball-2 {
  0%   { transform: translate(80vw, 20vh); }
  30%  { transform: translate(60vw, 40vh); }
  60%  { transform: translate(40vw, 60vh); }
  100% { transform: translate(20vw, 70vh); }
}

/* --- HEADER & NAVIGATION --- */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 1rem 5%;
  z-index: 1000;
  background: rgba(4, 6, 12, 0.5);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.back-link {
  color: var(--subtext);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}
.back-link:hover {
  color: var(--text);
}
.back-link i {
  margin-right: 0.5rem;
}

/* --- PAGE HEADER --- */
.projects-header {
  padding: 8rem 5% 4rem;
  text-align: center;
}
h1 {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}
.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.intro {
  font-size: 1rem;
  color: var(--subtext);
  max-width: 650px;
  margin: 0 auto;
}

/* --- PROJECT CARDS --- */
.project-grid {
  padding: 0 10% 6rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}
.project-card {
  background: var(--glass-bg);
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 8px 32px 0 var(--shadow);
  overflow: hidden;
  transition: transform 0.3s, border-color 0.3s;
  position: relative;
  padding: 2rem;
}
.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary);
}
.project-card::before {
  content: "";
  position: absolute;
  top: var(--mouse-y, 0);
  left: var(--mouse-x, 0);
  width: 0;
  height: 0;
  background: radial-gradient(circle, rgba(88, 101, 242, 0.2) 0%, transparent 80%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: width 0.3s, height 0.3s, opacity 0.3s;
  pointer-events: none;
}
.project-card:hover::before {
  opacity: 1;
  width: 400px;
  height: 400px;
}
.project-info h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.project-info p{
  font-size: 0.9rem;
}
.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  margin-bottom: 1.5rem;
}
.project-tech span {
  background: rgba(88, 101, 242, 0.1);
  color: var(--primary-light);
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: 0.8rem;
}
.project-links a {
  color: var(--subtext);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}
.project-links a:hover {
  color: var(--primary);
}

/* --- FOOTER --- */
footer {
  text-align: center;
  padding: 2rem 5%;
  border-top: 1px solid var(--border);
  color: var(--subtext);
}
.social-links {
  margin-bottom: 1rem;
}
.social-links a {
  color: var(--subtext);
  font-size: 1.5rem;
  margin: 0 0.75rem;
  transition: color 0.3s;
}
.social-links a:hover {
  color: var(--primary);
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
  .projects-header { padding: 6rem 5% 3rem; }
  .project-grid { padding: 0 5% 4rem; }
}