/* =========================================================
   Base & Variables
   ========================================================= */
:root {
  --bg:        #0f172a;
  --bg-alt:    #0b1120;
  --surface:   #1e293b;
  --surface2:  #263248;
  --accent:    #6366f1;
  --accent2:   #818cf8;
  --text:      #e2e8f0;
  --text-muted:#94a3b8;
  --border:    #2d3d55;
  --radius:    16px;
  --transition:0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* =========================================================
   Navbar
   ========================================================= */
#mainNav {
  background: rgba(15, 23, 42, 0);
  backdrop-filter: blur(0px);
  border-bottom: 1px solid transparent;
  transition: background var(--transition), backdrop-filter var(--transition),
              border-color var(--transition);
  padding: 1rem 0;
}

#mainNav.scrolled {
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(12px);
  border-color: var(--border);
  padding: 0.6rem 0;
}

.navbar-brand {
  font-size: 1.5rem;
  letter-spacing: -0.5px;
  color: var(--text) !important;
}

.navbar-nav .nav-link {
  color: var(--text-muted) !important;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--text) !important;
  background: rgba(99, 102, 241, 0.12);
}

.accent { color: var(--accent); }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 20px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 20%, rgba(99,102,241,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(129,140,248,0.10) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content { position: relative; z-index: 1; }

.hero-greeting {
  font-size: 1.1rem;
  color: var(--accent2);
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 1rem;
}

.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.hero-btns { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center; }

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-muted);
  font-size: 1.2rem;
  animation: bounce 2s infinite;
  text-decoration: none;
  z-index: 1;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* =========================================================
   Buttons
   ========================================================= */
.btn-main {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.7rem 1.6rem;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.btn-main:hover {
  background: var(--accent2);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99,102,241,0.35);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 0.7rem 1.6rem;
  font-weight: 600;
  font-size: 0.95rem;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.btn-ghost:hover {
  border-color: var(--accent);
  background: rgba(99,102,241,0.1);
  color: var(--text);
  transform: translateY(-2px);
}

.btn-card {
  background: rgba(99,102,241,0.12);
  color: var(--accent2);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 8px;
  padding: 0.5rem 1.1rem;
  font-size: 0.875rem;
  font-weight: 600;
  transition: background var(--transition), color var(--transition), transform var(--transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.btn-card:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* =========================================================
   Sections
   ========================================================= */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-alt); }

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -1px;
  text-align: center;
  margin-bottom: 0.5rem;
}

.section-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 0;
}

/* =========================================================
   Cards
   ========================================================= */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.35);
  border-color: rgba(99,102,241,0.4);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(99,102,241,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--accent2);
  margin-bottom: 1rem;
}

.card-title {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.card-text {
  color: var(--text-muted);
  font-size: 0.9rem;
  flex: 1;
  margin-bottom: 1rem;
}

.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.tag {
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--surface2);
  color: var(--text-muted);
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--border);
}

/* =========================================================
   Featured Card
   ========================================================= */
.card-featured {
  position: relative;
  border-color: rgba(99, 102, 241, 0.55);
  box-shadow: 0 0 0 1px rgba(99,102,241,0.3), 0 8px 32px rgba(99,102,241,0.18);
  background: linear-gradient(135deg, var(--surface) 0%, rgba(30,41,59,0.95) 100%);
}

.card-featured:hover {
  border-color: rgba(99,102,241,0.75);
  box-shadow: 0 0 0 1px rgba(99,102,241,0.5), 0 24px 48px rgba(99,102,241,0.25);
  transform: translateY(-4px);
}

.featured-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent2);
  background: rgba(99,102,241,0.14);
  border: 1px solid rgba(99,102,241,0.4);
  border-radius: 6px;
  padding: 0.25rem 0.65rem;
  margin-bottom: 1.25rem;
}

.featured-features {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.featured-features li {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
}

.featured-features li i {
  color: var(--accent2);
  margin-top: 0.15rem;
  flex-shrink: 0;
}

@media (max-width: 991px) {
  .featured-features {
    margin-top: 1.5rem;
    border-top: 1px solid var(--border);
    padding-top: 1.25rem;
  }
}

/* =========================================================
   Skills Grid
   ========================================================= */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1rem;
}

.skill-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: transform var(--transition), border-color var(--transition),
              background var(--transition), color var(--transition);
  cursor: default;
}

.skill-item:hover {
  transform: translateY(-4px);
  border-color: rgba(99,102,241,0.5);
  background: var(--surface2);
  color: var(--text);
}

.skill-icon {
  font-size: 2rem;
  color: var(--accent2);
  transition: color var(--transition);
}

.skill-item:hover .skill-icon { color: var(--accent); }

/* =========================================================
   About
   ========================================================= */
.about-text {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 1rem;
}

.about-text strong { color: var(--text); font-weight: 600; }

.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.about-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1rem;
  background: var(--bg);
  border-radius: 12px;
  border: 1px solid var(--border);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent2);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

/* =========================================================
   Contact
   ========================================================= */
.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-decoration: none;
  color: var(--text);
  transition: transform var(--transition), border-color var(--transition),
              box-shadow var(--transition), background var(--transition);
}

.contact-card:hover {
  transform: translateY(-5px);
  border-color: rgba(99,102,241,0.5);
  box-shadow: 0 16px 32px rgba(0,0,0,0.3);
  background: var(--surface2);
  color: var(--text);
}

.contact-icon {
  font-size: 2rem;
  color: var(--accent2);
  margin-bottom: 0.25rem;
}

.contact-label {
  font-weight: 700;
  font-size: 1rem;
}

.contact-value {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* =========================================================
   Footer
   ========================================================= */
footer {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
}

.footer-sub { font-size: 0.8rem; margin-top: 0.25rem; }

/* =========================================================
   Scroll Reveal Animations
   ========================================================= */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.8s ease forwards;
}

.fade-up:nth-child(1) { animation-delay: 0.1s; }
.fade-up:nth-child(2) { animation-delay: 0.25s; }
.fade-up:nth-child(3) { animation-delay: 0.4s; }
.fade-up:nth-child(4) { animation-delay: 0.55s; }

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 767px) {
  .hero { padding: 110px 20px 60px; }
  .section { padding: 70px 0; }
  .about-card { grid-template-columns: 1fr 1fr; gap: 1rem; padding: 1.5rem; }
  .stat-number { font-size: 1.5rem; }
  .skills-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
  .section-title.text-start { text-align: center !important; }
}

@media (max-width: 480px) {
  .hero h1 { letter-spacing: -1px; }
  .skills-grid { grid-template-columns: repeat(3, 1fr); }
}