/* Modern enhancements layer: subtle animations, gradients, accessibility, and refined visuals */

:root {
  --color-primary: #1d3557; /* deepened blue */
  --color-primary-strong: #0b2545;
  --color-secondary: #457b9d; /* complementary blue */
  --color-accent: #ff7043; /* refined orange accent */
  --color-bg: #0f172a; /* dark slate for depth overlays */
  --color-text: #0b2239;
  --color-text-on-dark: #e6edf3;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 24px 48px rgba(0, 0, 0, 0.18);
  --gradient-primary: linear-gradient(135deg, var(--color-primary-strong) 0%, #1b5ac7 55%, #29b6f6 100%);
}

/* Typography */
body {
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  color: var(--color-text);
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Poppins', 'Montserrat', 'Inter', sans-serif;
}

/* Links */
a {
  color: var(--color-secondary);
  text-decoration: none;
}

a:hover, a:focus {
  color: var(--color-accent);
  text-decoration: underline;
}

/* Ensure about-section questions render bold */
.lead b,
.lead strong {
  font-weight: 700;
}

/* Respect users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

/* Navigation polish */
#mainNav.bg-primary {
  background: rgba(41, 182, 246, 0.88) !important;
  backdrop-filter: saturate(120%) blur(8px);
}

#mainNav .nav-link {
  position: relative;
}

#mainNav .nav-link:after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0.35rem;
  width: 60%;
  height: 2px;
  background: #fff;
  transform: translateX(-50%) scaleX(0);
  transform-origin: center;
  transition: transform 220ms ease;
}

#mainNav .nav-link:hover:after,
#mainNav .nav-link:focus:after,
#mainNav .nav-link.active:after {
  transform: translateX(-50%) scaleX(1);
}

/* Hero section with refined gradient and subtle texture */
header.masthead {
  background: var(--gradient-primary);
  color: #fff;
  position: relative;
  overflow: hidden;
}

header.masthead:before {
  content: "";
  position: absolute;
  inset: -10% -10% 0 -10%;
  background: radial-gradient(1200px 400px at 50% -100%, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0) 70%);
  pointer-events: none;
}

header.masthead h1,
header.masthead h2 {
  text-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

header.masthead img {
  will-change: transform, filter;
  filter: drop-shadow(0 18px 28px rgba(0, 0, 0, 0.25));
  transition: transform 800ms cubic-bezier(0.22, 1, 0.36, 1);
}

/* Buttons with micro-interactions */
.btn {
  transition: transform 200ms ease, box-shadow 200ms ease, background-color 200ms ease, border-color 200ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-primary {
  background: var(--color-primary);
  border-color: #1a5fd1;
}

.btn-primary:hover,
.btn-primary:focus {
  background: #1a5fd1;
  border-color: var(--color-primary);
}

/* Portfolio hover depth, image lift, and caption blur */
.portfolio .portfolio-item {
  transform: translateY(0);
  transition: transform 350ms ease, box-shadow 350ms ease;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.portfolio .portfolio-item img {
  transition: transform 800ms cubic-bezier(0.22, 1, 0.36, 1);
}

.portfolio .portfolio-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

.portfolio .portfolio-item:hover img {
  transform: scale(1.05);
}

.portfolio .portfolio-item .portfolio-item-caption {
  backdrop-filter: blur(2px);
}

/* Subtle patterned backgrounds for contrast sections */
.bg-middle {
  background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0)),
    linear-gradient(135deg, #29b6f6 0%, #1b86d2 100%) !important;
}

.bg-secondary {
  background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0)),
    linear-gradient(135deg, #0e3a68 0%, #01579b 100%) !important;
}

/* Scroll reveal utility */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 600ms ease, transform 600ms ease;
}

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

/* Better focus for accessibility */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* High-res images load behavior */
img[loading="lazy"] {
  transform-origin: 50% 50%;
}