/* =========================================
   1. RESET & VARIABLES (THEME ENGINE)
   ========================================= */
:root {
  /* --- DARK MODE DEFAULTS (The 'Futuristic' Look) --- */
  --bg-body: #050505;
  --bg-card: #121212;
  --bg-header: rgba(5, 5, 5, 0.9);
  --text-main: #ffffff;
  --text-muted: #a0a0a0;
  --accent: #00f2ff;        /* Cyan */
  --accent-hover: #00c8d4;
  --border-color: #222222;
  --card-shadow: none;
  --icon-filter: invert(1); /* Makes black icons white */
  
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --container-width: 1100px;
  --transition: all 0.3s ease;
}

/* --- LIGHT MODE OVERRIDES --- */
body.light-mode {
  --bg-body: #f4f4f4;
  --bg-card: #ffffff;
  --bg-header: rgba(255, 255, 255, 0.9);
  --text-main: #1a1a1a;
  --text-muted: #555555;
  --accent: #008c94;        /* Darker Teal for better visibility on white */
  --accent-hover: #006c73;
  --border-color: #e0e0e0;
  --card-shadow: 0 4px 20px rgba(0,0,0,0.05);
  --icon-filter: invert(0); /* Keeps icons black */
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* =========================================
   2. UTILITIES
   ========================================= */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section-padding { padding: 100px 0; }

.title-wrapper { text-align: center; margin-bottom: 60px; }
.title {
  font-size: 2.5rem;
  font-weight: 700;
  display: inline-block;
  position: relative;
  color: var(--text-main);
}
.title::after {
  content: '';
  display: block;
  width: 60%;
  height: 4px;
  background: var(--accent);
  margin: 10px auto 0;
  border-radius: 2px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-primary {
  background-color: var(--accent);
  color: #fff;
  border: 2px solid var(--accent);
}
/* Fix text color for dark mode cyan button specifically */
:root:not(.light-mode) .btn-primary { color: #000; } 

.btn-primary:hover {
  background-color: transparent;
  color: var(--accent);
}
.btn-outline {
  background-color: transparent;
  border: 2px solid var(--text-main);
  color: var(--text-main);
}
.btn-outline:hover {
  background-color: var(--text-main);
  color: var(--bg-body);
}

/* =========================================
   3. HEADER & THEME TOGGLE
   ========================================= */
.header {
  position: fixed;
  top: 0; left: 0; width: 100%;
  background: var(--bg-header);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-color);
  transition: background 0.3s ease, border 0.3s ease;
}
.header-nav { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 800; color: var(--accent); letter-spacing: 1px; }

.nav-group { display: flex; align-items: center; gap: 30px; }
.nav-list { display: flex; gap: 30px; }
.nav-link { font-size: 0.95rem; font-weight: 500; opacity: 0.8; color: var(--text-main); }
.nav-link:hover, .nav-link.active { opacity: 1; color: var(--accent); }

/* Theme Toggle Button */
.theme-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  width: 40px; height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
  color: var(--text-main);
}
.theme-btn:hover { border-color: var(--accent); color: var(--accent); }

/* SVG Icon styling */
.theme-btn svg { width: 20px; height: 20px; fill: currentColor; }
/* Hide moon by default (dark mode), hide sun in light mode */
.icon-sun { display: block; }
.icon-moon { display: none; }
body.light-mode .icon-sun { display: none; }
body.light-mode .icon-moon { display: block; }

/* Mobile Hamburger */
.nav-btn { display: none; background: none; border: none; cursor: pointer; }
.nav-btn img { filter: var(--icon-filter); width: 30px; }

/* =========================================
   4. HERO
   ========================================= */
.hero {
  padding: 180px 0 100px;
  display: flex;
  align-items: center;
  min-height: 90vh;
  background: radial-gradient(circle at top right, rgba(0, 242, 255, 0.05) 0%, transparent 40%);
}
.hero-row { display: flex; align-items: center; justify-content: space-between; gap: 50px; }
.hero-content { flex: 1; }

.greeting { color: var(--accent); font-weight: 600; margin-bottom: 10px; display: block; letter-spacing: 1px; }
.hero-name { font-size: 3.5rem; line-height: 1.1; margin-bottom: 15px; font-weight: 800; color: var(--text-main); }
.hero-subtitle { font-size: 1.25rem; color: var(--text-muted); margin-bottom: 30px; display: block; }

.social-row { display: flex; gap: 20px; margin-bottom: 40px; }
.social-row img { 
  width: 24px; height: 24px; 
  filter: var(--icon-filter); 
  opacity: 0.6; transition: var(--transition); 
}
.social-row a:hover img { opacity: 1; transform: translateY(-3px); }

.hero-img-wrapper { flex: 1; display: flex; justify-content: center; }
.hero-img-wrapper img {
  width: 350px; height: 350px;
  object-fit: cover; border-radius: 50%;
  border: 3px solid var(--accent);
  box-shadow: 0 0 40px rgba(0, 242, 255, 0.15);
}

/* =========================================
   5. ABOUT
   ========================================= */
.about-row { display: flex; gap: 60px; align-items: flex-start; }
.about-text { flex: 1; }
.about-descr { color: var(--text-muted); margin-bottom: 30px; font-size: 1.05rem; }

.about-skills { 
  flex: 1; 
  background: var(--bg-card); 
  padding: 30px; 
  border-radius: 8px; 
  border: 1px solid var(--border-color); 
  box-shadow: var(--card-shadow);
}
.skill { margin-bottom: 20px; }
.skill-header { display: flex; justify-content: space-between; margin-bottom: 8px; font-size: 0.9rem; font-weight: 600; color: var(--text-main); }
.progress-bar { width: 100%; height: 6px; background: var(--border-color); border-radius: 3px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--accent); border-radius: 3px; }

/* Services Grid */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  margin-top: 80px;
}
.service-card {
  background: var(--bg-card);
  padding: 35px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  box-shadow: var(--card-shadow);
}
.service-card:hover { border-color: var(--accent); transform: translateY(-5px); }
.service-icon { width: 50px; margin-bottom: 20px; filter: var(--icon-filter); }
.service-title { margin-bottom: 15px; font-size: 1.2rem; color: var(--text-main); }
.service-text { font-size: 0.9rem; color: var(--text-muted); }

/* =========================================
   6. PROJECTS
   ========================================= */
.projects { background-color: var(--bg-body); } 

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}
.project-card {
  position: relative;
  aspect-ratio: 4/3;
  background: var(--bg-card);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.project-img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }

.project-overlay {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.85); /* Always dark overlay */
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  opacity: 0; transition: var(--transition);
  padding: 20px; text-align: center;
}
.project-title { color: var(--accent); margin-bottom: 5px; font-size: 1.2rem; transform: translateY(20px); transition: 0.4s; }
.project-cat { color: #fff; font-size: 0.9rem; transform: translateY(20px); transition: 0.4s; }

.project-card:hover .project-img { transform: scale(1.1); }
.project-card:hover .project-overlay { opacity: 1; }
.project-card:hover .project-title, 
.project-card:hover .project-cat { transform: translateY(0); }

/* =========================================
   7. CONTACT & FOOTER
   ========================================= */
.contact-form { max-width: 600px; margin: 0 auto; }
.input-group { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }

input, textarea {
  width: 100%; background: var(--bg-card); 
  border: 1px solid var(--border-color);
  padding: 15px; color: var(--text-main); border-radius: 4px;
  font-family: var(--font-main);
}
input:focus, textarea:focus { outline: none; border-color: var(--accent); }
textarea { height: 150px; resize: none; margin-bottom: 25px; }
.form-btn-wrapper { text-align: center; }

.footer { padding: 40px 0; text-align: center; border-top: 1px solid var(--border-color); margin-top: 50px; font-size: 0.9rem; color: var(--text-muted); }

/* =========================================
   8. RESPONSIVE
   ========================================= */
@media (max-width: 968px) {
  .hero-row { flex-direction: column-reverse; text-align: center; }
  .about-row { flex-direction: column; }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-name { font-size: 2.5rem; }
}

@media (max-width: 768px) {
  .nav-list {
    display: none; 
    flex-direction: column;
    position: absolute; top: 100%; left: 0; width: 100%;
    background: var(--bg-card); padding: 20px; 
    border-bottom: 1px solid var(--accent);
  }
  .nav-list.active { display: flex; }
  .nav-btn { display: block; }
  
  .nav-group { gap: 15px; }
  
  .projects-grid { grid-template-columns: 1fr; }
  .input-group { grid-template-columns: 1fr; }
}