/**
 * Responsive Design & Mobile Optimization
 * Supports: Mobile (375px), Tablet (768px), Desktop (1920px)
 */

/* ─────────────────────────────────────────────────────────────
   MOBILE FIRST APPROACH (375px and up)
   ───────────────────────────────────────────────────────────── */

:root {
  --mobile-padding: 1rem;
  --tablet-padding: 1.5rem;
  --desktop-padding: 2rem;
  --transition-speed: 0.3s;
}

/* Base responsive typography */
html {
  font-size: 16px;
}

body {
  padding: 0;
  margin: 0;
  overflow-x: hidden;
}

/* ─────────────────────────────────────────────────────────────
   NAVIGATION & HAMBURGER MENU
   ───────────────────────────────────────────────────────────── */

.navbar {
  padding: 0.75rem var(--mobile-padding);
}

.navbar-brand {
  font-size: 1.25rem;
  font-weight: 700;
}

.navbar-toggler {
  border: none;
  padding: 0.25rem 0.5rem;
  font-size: 1.25rem;
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
  outline: none;
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.55%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.navbar-collapse {
  padding-top: 1rem;
}

.navbar-nav {
  gap: 0.5rem;
}

.nav-link {
  padding: 0.75rem 0 !important;
  font-size: 0.95rem;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-speed);
}

.nav-link:hover,
.nav-link.active {
  border-bottom-color: #0d6efd;
}

.navbar .btn {
  width: 100%;
  margin-top: 1rem;
  font-size: 0.95rem;
}

/* ─────────────────────────────────────────────────────────────
   HERO SECTION - MOBILE OPTIMIZED
   ───────────────────────────────────────────────────────────── */

.hero-section {
  padding: 3rem var(--mobile-padding) 2rem;
  text-align: center;
}

.hero-section h1 {
  font-size: 1.75rem;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero-section .lead {
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.hero-section .d-flex {
  flex-direction: column;
  gap: 0.75rem;
}

.hero-section .btn {
  width: 100%;
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
}

/* ─────────────────────────────────────────────────────────────
   PORTFOLIO GRID - RESPONSIVE COLUMNS
   Mobile: 1 column
   Tablet: 2 columns
   Desktop: 3 columns
   ───────────────────────────────────────────────────────────── */

.portfolio-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 0 var(--mobile-padding);
}

.portfolio-item {
  min-height: 300px;
}

.portfolio-card {
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: 0.5rem;
}

.portfolio-card-img-wrapper {
  position: relative;
  width: 100%;
  padding-bottom: 66.67%; /* 3:2 aspect ratio */
  overflow: hidden;
  background: #f0f0f0;
}

.portfolio-card-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-speed);
}

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

.portfolio-card-img-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #e9ecef;
  color: #6c757d;
}

.portfolio-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(13, 27, 42, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-speed);
  z-index: 10;
}

.portfolio-card:hover .portfolio-overlay {
  opacity: 1;
}

.portfolio-card .card-body {
  padding: 1rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.portfolio-card .badge {
  font-size: 0.75rem;
  padding: 0.35rem 0.65rem;
}

.portfolio-card .card-title {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.portfolio-card .card-text {
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.portfolio-card .btn {
  align-self: flex-start;
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
}

/* ─────────────────────────────────────────────────────────────
   SERVICE CARDS - MOBILE OPTIMIZED
   ───────────────────────────────────────────────────────────── */

.service-card {
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  margin-bottom: 1rem;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.service-card .card-body {
  padding: 1.5rem;
}

.service-card .card-title {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.service-card .card-text {
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.service-card .btn {
  width: 100%;
  font-size: 0.95rem;
}

.promo-badge {
  font-size: 0.75rem;
  padding: 0.35rem 0.65rem;
}

/* ─────────────────────────────────────────────────────────────
   TOUCH-FRIENDLY INTERACTIVE ELEMENTS
   ───────────────────────────────────────────────────────────── */

/* Ensure buttons are at least 44x44px for touch targets */
.btn {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border-radius: 0.375rem;
  transition: all var(--transition-speed);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.btn:active {
  transform: scale(0.98);
}

/* Links should be easily tappable */
a {
  -webkit-tap-highlight-color: transparent;
}

/* Form inputs touch-friendly */
input,
textarea,
select {
  min-height: 44px;
  font-size: 1rem;
  padding: 0.75rem;
  border-radius: 0.375rem;
}

textarea {
  min-height: 120px;
}

/* ─────────────────────────────────────────────────────────────
   SECTIONS & CONTAINERS - MOBILE PADDING
   ───────────────────────────────────────────────────────────── */

section {
  padding: 2rem var(--mobile-padding);
}

.container {
  padding-left: var(--mobile-padding);
  padding-right: var(--mobile-padding);
}

/* ─────────────────────────────────────────────────────────────
   FOOTER - MOBILE OPTIMIZED
   ───────────────────────────────────────────────────────────── */

footer {
  padding: 2rem var(--mobile-padding);
  font-size: 0.9rem;
}

footer h5,
footer h6 {
  font-size: 1rem;
  margin-bottom: 1rem;
}

footer ul {
  padding-left: 0;
}

footer li {
  margin-bottom: 0.5rem;
}

footer a {
  color: #adb5bd;
  text-decoration: none;
  transition: color var(--transition-speed);
}

footer a:hover {
  color: #fff;
}

/* ─────────────────────────────────────────────────────────────
   TABLET BREAKPOINT (768px and up)
   ───────────────────────────────────────────────────────────── */

@media (min-width: 768px) {
  :root {
    --mobile-padding: 1.5rem;
  }

  html {
    font-size: 17px;
  }

  .navbar {
    padding: 1rem var(--tablet-padding);
  }

  .navbar-brand {
    font-size: 1.4rem;
  }

  .navbar-collapse {
    padding-top: 0;
  }

  .navbar-nav {
    gap: 1rem;
  }

  .nav-link {
    padding: 0.5rem 0 !important;
    font-size: 1rem;
  }

  .navbar .btn {
    width: auto;
    margin-top: 0;
    margin-left: 1rem;
  }

  /* Hero section tablet */
  .hero-section {
    padding: 4rem var(--tablet-padding) 3rem;
  }

  .hero-section h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
  }

  .hero-section .lead {
    font-size: 1.1rem;
    margin-bottom: 2rem;
  }

  .hero-section .d-flex {
    flex-direction: row;
    gap: 1rem;
    justify-content: center;
  }

  .hero-section .btn {
    width: auto;
    font-size: 1rem;
    padding: 0.75rem 2rem;
  }

  /* Portfolio grid - 2 columns on tablet */
  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    padding: 0 var(--tablet-padding);
  }

  .portfolio-item {
    min-height: 350px;
  }

  /* Service cards tablet */
  .service-card {
    margin-bottom: 0;
  }

  /* Sections tablet */
  section {
    padding: 3rem var(--tablet-padding);
  }

  .container {
    padding-left: var(--tablet-padding);
    padding-right: var(--tablet-padding);
  }

  /* Footer tablet */
  footer {
    padding: 3rem var(--tablet-padding);
  }
}

/* ─────────────────────────────────────────────────────────────
   DESKTOP BREAKPOINT (1200px and up)
   ───────────────────────────────────────────────────────────── */

@media (min-width: 1200px) {
  :root {
    --mobile-padding: 2rem;
  }

  html {
    font-size: 18px;
  }

  .navbar {
    padding: 1rem var(--desktop-padding);
  }

  .navbar-brand {
    font-size: 1.5rem;
  }

  /* Hero section desktop */
  .hero-section {
    padding: 5rem var(--desktop-padding) 4rem;
  }

  .hero-section h1 {
    font-size: 3.5rem;
    margin-bottom: 2rem;
  }

  .hero-section .lead {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
  }

  .hero-section .btn {
    font-size: 1.1rem;
    padding: 0.875rem 2.5rem;
  }

  /* Portfolio grid - 3 columns on desktop */
  .portfolio-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    padding: 0 var(--desktop-padding);
  }

  .portfolio-item {
    min-height: 400px;
  }

  /* Sections desktop */
  section {
    padding: 4rem var(--desktop-padding);
  }

  .container {
    padding-left: var(--desktop-padding);
    padding-right: var(--desktop-padding);
  }

  /* Footer desktop */
  footer {
    padding: 4rem var(--desktop-padding);
  }
}

/* ─────────────────────────────────────────────────────────────
   LARGE DESKTOP (1920px and up)
   ───────────────────────────────────────────────────────────── */

@media (min-width: 1920px) {
  html {
    font-size: 19px;
  }

  .hero-section h1 {
    font-size: 4rem;
  }

  .portfolio-grid {
    gap: 2.5rem;
  }
}

/* ─────────────────────────────────────────────────────────────
   IMAGE OPTIMIZATION & LAZY LOADING
   ───────────────────────────────────────────────────────────── */

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Responsive images with srcset */
img[srcset] {
  width: 100%;
  height: auto;
}

/* Lazy loading placeholder */
img[loading="lazy"] {
  background: linear-gradient(90deg, #e9ecef 25%, #dee2e6 50%, #e9ecef 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
}

@keyframes skeleton-shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ─────────────────────────────────────────────────────────────
   ACCESSIBILITY & FOCUS STATES
   ───────────────────────────────────────────────────────────── */

/* Visible focus indicators for keyboard navigation */
*:focus-visible {
  outline: 2px solid #0d6efd;
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid #0d6efd;
  outline-offset: 2px;
}

/* Skip to main content link */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: #0d6efd;
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 100;
}

.skip-to-main:focus {
  top: 0;
}

/* ─────────────────────────────────────────────────────────────
   PRINT STYLES
   ───────────────────────────────────────────────────────────── */

@media print {
  .navbar,
  footer,
  .btn,
  .portfolio-overlay {
    display: none;
  }

  body {
    font-size: 12pt;
    color: #000;
  }

  a {
    text-decoration: underline;
  }
}

/* ─────────────────────────────────────────────────────────────
   UTILITY CLASSES FOR RESPONSIVE BEHAVIOR
   ───────────────────────────────────────────────────────────── */

.mobile-only {
  display: block;
}

.tablet-only {
  display: none;
}

.desktop-only {
  display: none;
}

@media (min-width: 768px) {
  .mobile-only {
    display: none;
  }

  .tablet-only {
    display: block;
  }
}

@media (min-width: 1200px) {
  .tablet-only {
    display: none;
  }

  .desktop-only {
    display: block;
  }
}

/* ─────────────────────────────────────────────────────────────
   REDUCED MOTION SUPPORT
   ───────────────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}