/* Bootstrap (kept) */
@import url('https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css');

/* ===== Design Tokens ===== */
:root {
  --brand-1: #3674B5;
  --brand-2: #578FCA;
  --brand-3: #A1E3F9;

  --ink: #101828;
  --muted: #667085;
  --card-bg: #ffffff;
  --card-border: rgba(16,24,40,.08);
  --ring: rgba(54,116,181,.35);

  --radius: 16px;
  --shadow-1: 0 1px 2px rgba(16,24,40,.08);
  --shadow-2: 0 12px 24px rgba(16,24,40,.14);

  --page-bg: whitesmoke;
}

[data-bs-theme="dark"] {
  --ink: #E6E8EC;
  --muted: #dcdee1;
  --card-bg: #0f1723;
  --card-border: rgba(255,255,255,.08);
  --ring: rgba(161,227,249,.24);
  --page-bg: #3c414b;
}

html { scroll-behavior: smooth; }
body {
  background-color: var(--page-bg); /* CHANGED: was 'whitesmoke' */
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.portfolio-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1200;
  width: 100%;
  height: 0.24rem;
  transform: scaleX(0);
  transform-origin: left center;
  background-color: var(--brand-1);
  box-shadow: 0 0 18px rgba(54,116,181,.45);
  pointer-events: none;
}

/* ===== Animated Gradient (for hero) ===== */
.gradient-background {
  background: linear-gradient(300deg, var(--brand-1), var(--brand-2), var(--brand-3));
  background-size: 180% 180%;
  animation: gradient-animation 10s ease infinite;
}
@keyframes gradient-animation {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ===== Navbar (glassy + hide-on-scroll) ===== */
#navbar {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  transition: top .3s ease, background-color .2s ease, border-color .2s ease;
  z-index: 1000;
  background: rgba(255,255,255,.72) !important;
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid rgba(0,0,0,.06);
}
#navbar.hidden { top: -100px; }
[data-bs-theme="dark"] #navbar {
  background: rgba(7,12,20,.7) !important;
  border-bottom-color: rgba(255,255,255,.06);
}

/* ===== Hero ===== */
.hero {
  margin-top: 72px; /* space for fixed navbar */
  border-radius: clamp(12px, 2vw, 20px);
  color: #fff;
  overflow: hidden;
}
.hero-inner {
  padding: clamp(2rem, 5vw, 4rem);
  text-align: center;
}
.hero h1 {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(1.8rem, 3.6vw, 3rem);
  margin: 0 0 .5rem 0;
  color: #fff;
}
.hero p {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  margin: 0;
  opacity: .95;
}

/* ===== Section heading ===== */
.section-head {
  margin: clamp(1.25rem, 3vw, 2rem) 0 1rem;
  text-align: center;
}
.section-head h2 {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-weight: 700;
  font-size: clamp(2rem, 2vw, 3rem);
  color: var(--muted);
}

.portfolio-toolbar {
  display: grid;
  gap: 0.85rem;
  margin-bottom: 1.2rem;
  padding: 0.85rem;
  border: 1px solid var(--card-border);
  border-radius: 14px;
  background: rgba(255,255,255,.72);
  backdrop-filter: blur(6px);
}

[data-bs-theme="dark"] .portfolio-toolbar {
  background: rgba(7,12,20,.62);
}

.search-wrap {
  min-width: 0;
}

#projectSearch {
  border: 1px solid var(--card-border);
  border-radius: 12px;
  background: var(--card-bg);
  color: var(--ink);
}

[data-bs-theme="dark"] #projectSearch {
  background: #101923;
  border-color: rgba(255,255,255,.14);
}

#projectSearch::placeholder {
  color: var(--muted);
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-chip {
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 0.38rem 0.78rem;
  background: transparent;
  color: var(--muted);
  font-weight: 600;
  line-height: 1;
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease, color .2s ease;
}

.filter-chip:hover {
  transform: translateY(-1px);
  border-color: var(--brand-2);
  color: var(--ink);
}

.filter-chip.is-active {
  background-color: var(--brand-1);
  border-color: var(--brand-1);
  color: #fff;
}

.project-count {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

@media (min-width: 768px) {
.portfolio-toolbar {
    grid-template-columns: 1fr auto auto;
    align-items: center;
  }

.chip-group {
    justify-content: center;
  }
}

/* ===== Cards ===== */
.card {
  --card-lift: 0px;
  --card-rotate-x: 0deg;
  --card-rotate-y: 0deg;
  --card-glow-x: 50%;
  --card-glow-y: 45%;
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  transform: perspective(900px) translateY(var(--card-lift)) rotateX(var(--card-rotate-x)) rotateY(var(--card-rotate-y));
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  transform-style: preserve-3d;
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(200px circle at var(--card-glow-x) var(--card-glow-y), rgba(161,227,249,.22), transparent 62%);
  opacity: 0;
  pointer-events: none;
  transition: opacity .24s ease;
}

.card:hover {
  --card-lift: -6px;
  box-shadow: var(--shadow-2);
  border-color: var(--ring);
}

.card:hover::after,
.card.is-tilting::after {
  opacity: 1;
}

.card.is-tilting {
  --card-lift: -8px;
}

.card:focus-within {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

.card-img-top {
  width: 100%;
  aspect-ratio: 16 / 9;  /* keeps all thumbs consistent */
  object-fit: cover;
  display: block;
  transition: transform .35s ease;

}
.card:hover .card-img-top { transform: scale(1.03); }

.card-title {
  margin: 0;
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
}
.card-title a {
  text-decoration: none;
  color: inherit;
}
.card-title a:hover { color: var(--brand-1); }

/* Project grid (auto columns) */
#projects {
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.project-item {
  opacity: 0;
  transform: translateY(22px) scale(0.985);
  filter: blur(1.5px);
  transition: opacity .62s cubic-bezier(.2,.65,.2,1),
    transform .62s cubic-bezier(.2,.65,.2,1),
    filter .62s cubic-bezier(.2,.65,.2,1);
  transition-delay: var(--item-delay, 0ms);
}

.project-item.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  filter: blur(0);
}

.project-item.is-hidden {
  display: none !important;
}

.no-results {
  margin-top: 1.25rem;
  text-align: center;
  color: var(--muted);
  font-weight: 600;
}

/* Footer */
footer {
  border-top: 1px solid var(--card-border);
  margin-top: clamp(2rem, 5vw, 3rem);
  background: rgba(255,255,255,.65);
  backdrop-filter: saturate(160%) blur(6px);
}
[data-bs-theme="dark"] footer {
  background: rgba(7,12,20,.6);
}

/* Links in footer */
footer a { margin: 0 .75rem; color: var(--muted); }
footer a:hover { color: var(--brand-1); }

/* Accessibility: visible focus for links/buttons */
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 2px;
  border-radius: 10px;
}

/* Reduce motion preference */
@media (prefers-reduced-motion: reduce) {
  .gradient-background { animation: none; }
  .portfolio-progress { display: none; }
  .card:hover { transform: none; }
  .project-item,
  .project-item.is-visible {
    opacity: 1;
    transform: none;
    filter: none;
    transition: none;
  }
  .card,
  .card:hover,
  .card.is-tilting {
    transform: none;
  }
  .card::after {
    display: none;
  }
}

/* Small device polish */
@media (max-width: 575.98px) {
  .navbar-brand { font-weight: 800; }
}