/* ============================================================
   Portfolio — Main CSS  |  Dark Theme
   Stack: Tailwind CDN + Vanilla CSS utilities
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --primary: #0B3C74;
  --primary-dark: #1685C7;
  --base: #F8FAFC;
  --card: #FFFFFF;
  --card-2: #e2e8f0;
  --muted: #6C7280;
  --light: #1A1F2B;
  --purple: #E6006E;
  --border: rgba(26,31,43,.15);
  --glow: 0 0 20px rgba(41,212,255,.35);
  --glow-lg: 0 0 40px rgba(41,212,255,.25);
  --font: 'Inter', sans-serif;
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Base ---------- */
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--base);
  color: var(--light);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; scrollbar-width: thin; scrollbar-color: var(--primary) var(--card); }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--card); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 999px; }

/* ---------- Skip Link ---------- */
.skip-link {
  position: absolute;
  top: -9999px; left: 16px;
  background: var(--primary);
  color: var(--base);
  padding: 8px 16px;
  border-radius: 0 0 8px 8px;
  font-weight: 700;
  z-index: 10000;
  transition: top .2s;
}
.skip-link:focus { top: 0; }

/* ---------- Preloader ---------- */
#preloader {
  background: var(--base);
  transition: opacity .5s ease, visibility .5s ease;
}
#preloader.hide { opacity: 0; visibility: hidden; }

.preloader-bar {
  width: 120px; height: 3px;
  background: var(--card-2);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 16px;
}
.preloader-bar::after {
  content: '';
  display: block;
  height: 100%;
  width: 40%;
  background: var(--primary);
  border-radius: 999px;
  animation: barSlide 1s ease-in-out infinite;
}
@keyframes barSlide {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(400%); }
}

/* ---------- Header / Navbar ---------- */
#header {
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s, backdrop-filter .3s;
}
#header.scrolled {
  background: rgba(248,250,252,.85);
  border-color: var(--border);
  backdrop-filter: blur(16px);
}

/* Nav links */
.nav-link {
  position: relative;
  color: var(--muted);
  font-size: .95rem;
  font-weight: 500;
  padding-bottom: 4px;
  transition: color .25s;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--primary);
  border-radius: 999px;
  box-shadow: var(--glow);
  transition: width .3s;
}
.nav-link:hover,
.nav-link.active { color: var(--primary); }
.nav-link:hover::after,
.nav-link.active::after { width: 100%; }

/* Logo box */
.logo-box {
  width: 40px; height: 40px;
  background: var(--purple);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .85rem;
  color: #fff; flex-shrink: 0;
  transition: box-shadow .3s;
}
.logo-box:hover { box-shadow: 0 0 16px rgba(230,0,110,.5); }

/* ---------- Mobile Menu ---------- */
.mobile-menu {
  opacity: 0;
  visibility: hidden;
  transform: scale(1.03);
  transition: opacity .35s ease, visibility .35s ease, transform .35s ease;
}
.mobile-menu.open {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

.mobile-nav-link {
  color: var(--muted);
  font-size: 1.5rem;
  font-weight: 600;
  transition: color .2s;
  position: relative;
  padding-bottom: 4px;
}
.mobile-nav-link::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%;
  transform: translateX(-50%);
  width: 0; height: 2px;
  background: var(--primary);
  border-radius: 999px;
  transition: width .3s;
}
.mobile-nav-link:hover {
  color: var(--primary);
}
.mobile-nav-link:hover::after { width: 100%; }

/* ---------- Buttons ---------- */
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 24px;
  background: var(--primary);
  color: var(--base);
  font-weight: 700; font-size: .9rem;
  border-radius: 8px;
  transition: background .25s, box-shadow .25s, transform .2s;
  white-space: nowrap;
}
.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: var(--glow);
  transform: translateY(-2px);
}

.btn-outline {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 24px;
  border: 1.5px solid var(--primary);
  color: var(--primary);
  font-weight: 700; font-size: .9rem;
  border-radius: 8px;
  transition: background .25s, color .25s, transform .2s;
}
.btn-outline:hover {
  background: var(--primary);
  color: var(--base);
  transform: translateY(-2px);
}

/* ---------- Section Badge ---------- */
.section-badge {
  display: inline-block;
  padding: 4px 14px;
  border: 1px solid var(--primary);
  color: var(--primary);
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .08em;
}

/* ---------- Glow Text ---------- */
.glow-text { text-shadow: 0 0 30px rgba(41,212,255,.6); }

/* ---------- Hero ---------- */
.hero-section {
  background: var(--base);
  position: relative;
  overflow: hidden;
}

/* Subtle background decoration */
.hero-section::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(11,60,116,.08) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
}

/* Centered hero wrapper */
.hero-centered {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 0;
}

/* Stats row */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  width: 100%;
  max-width: 560px;
}

.hero-stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 12px;
  text-align: center;
  transition: border-color .3s, transform .3s, box-shadow .3s;
}
.hero-stat-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--glow);
}

/* ---------- About ---------- */
.about-img-wrapper {
  position: relative;
  border-radius: 16px;
  padding: 4px;
  background: linear-gradient(135deg, var(--primary), transparent 60%);
  box-shadow: var(--glow-lg);
  display: inline-block;
}
.about-img {
  width: 100%; max-width: 380px; height: auto;
  border-radius: 14px; display: block;
}

/* Feature cards */
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  transition: border-color .3s, transform .3s;
}
.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
}

/* ---------- Skills ---------- */
.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 16px;
  display: flex; flex-direction: column;
  align-items: center; gap: 12px;
  text-align: center;
  transition: border-color .3s, transform .3s, box-shadow .3s;
  cursor: default;
}
.skill-card:hover {
  border-color: var(--primary);
  transform: translateY(-5px);
  box-shadow: var(--glow);
}
.skill-icon { width: 52px; height: 52px; display: flex; align-items: center; justify-content: center; }
.skill-name { color: var(--light); font-size: .85rem; font-weight: 600; }

/* ---------- Projects ---------- */
.filter-btn {
  padding: 8px 20px;
  border-radius: 999px;
  border: 1.5px solid var(--border);
  color: var(--muted);
  font-size: .875rem;
  font-weight: 500;
  transition: all .25s;
  background: transparent;
  cursor: pointer;
}
.filter-btn:hover,
.filter-btn.active {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(11,60,116,.08);
}

.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--glow);
  border-color: var(--primary);
}
.project-card.hidden { display: none; }

.project-img-wrapper { position: relative; overflow: hidden; }
.project-img-wrapper img { width: 100%; height: 220px; object-fit: cover; display: block; transition: transform .4s; }
.project-card:hover .project-img-wrapper img { transform: scale(1.05); }

.project-overlay {
  position: absolute; inset: 0;
  background: rgba(255,255,255,.85);
  display: flex; align-items: center; justify-content: center; gap: 16px;
  opacity: 0; transition: opacity .3s;
}
.project-card:hover .project-overlay { opacity: 1; }

.overlay-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 20px;
  background: var(--primary);
  color: var(--base);
  border-radius: 8px;
  font-weight: 700; font-size: .85rem;
  transition: background .2s, transform .2s;
}
.overlay-btn:hover { background: var(--primary-dark); transform: scale(1.05); }
.overlay-btn.outline {
  background: transparent;
  border: 1.5px solid var(--light);
  color: var(--light);
}
.overlay-btn.outline:hover { background: var(--light); color: var(--base); }

.project-body { padding: 20px; }
.project-title { font-size: 1.1rem; font-weight: 700; color: var(--light); margin-bottom: 10px; }
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.project-tag {
  padding: 3px 10px;
  background: rgba(11,60,116,.12);
  color: var(--primary);
  border-radius: 999px;
  font-size: .75rem;
  font-weight: 600;
}

/* ---------- Contact ---------- */
.contact-section { background: var(--card); }

.info-card {
  display: flex; align-items: center; gap: 16px;
  background: var(--base);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  transition: border-color .3s, transform .3s;
}
.info-card:hover { border-color: var(--primary); transform: translateY(-3px); }

.info-icon {
  width: 48px; height: 48px; flex-shrink: 0;
  background: rgba(11,60,116,.12);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: var(--primary); font-size: 1.1rem;
}

/* Form */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: .875rem; font-weight: 500; color: var(--muted); }
.form-group input,
.form-group textarea {
  background: var(--base);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  color: var(--light);
  font-family: var(--font);
  font-size: .9rem;
  transition: border-color .25s, box-shadow .25s;
  outline: none;
  width: 100%;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(11,60,116,.15);
}
.form-group textarea { resize: vertical; min-height: 130px; }

/* Success message */
#form-success {
  display: none;
  background: rgba(11,60,116,.1);
  border: 1px solid var(--primary);
  border-radius: 10px;
  padding: 16px;
  color: var(--primary);
  text-align: center;
  font-weight: 600;
}
#form-success.show { display: block; }

/* Social links */
.social-link {
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--muted);
  transition: all .25s;
}
.social-link:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(11,60,116,.08);
  transform: translateY(-3px);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--base);
  border-top: 1px solid var(--border);
  padding: 28px 0;
}

/* ---------- Scroll Top ---------- */
#scrollTopBtn {
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: opacity .4s, transform .4s;
}
#scrollTopBtn.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
#scrollTopBtn.show:hover { animation: pulseGlow 1.5s infinite; }

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 10px rgba(41,212,255,.4); }
  50%       { box-shadow: 0 0 25px rgba(41,212,255,.8); }
}

/* ---------- Focus Ring ---------- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}