/* === Base Styles === */
:root {
  --bg-color: #ffffff;
  --text-color: #000000;
  --accent-color: #2196F3;
  --card-bg: #f4f4f4;
  --card-border: #ddd;
}

.dark {
  --bg-color: #121212;
  --text-color: #f5f5f5;
  --card-bg: #1e1e1e;
  --card-border: #333;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

nav {
  display: flex;
  justify-content: center;
  background-color: var(--card-bg);
  padding: 1rem;
  gap: 2rem;
  border-bottom: 1px solid var(--card-border);
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: bold;
}

header {
  text-align: center;
  padding: 2rem 1rem;
}

header img {
  max-width: 300px;
  width: 100%;
  height: auto;
  margin: 0 auto 1.5rem;
  display: block;
}

h1, h2, h3 {
  color: var(--text-color);
}

main {
  padding: 2rem 1rem;
  max-width: 1000px;
  margin: auto;
}

/* === Services Grid === */
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.service-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 1rem;
  transition: transform 0.2s ease;
}

.service-card:hover {
  transform: translateY(-5px);
}

/* === Contact === */
.contact label,
.contact input,
.contact textarea,
.contact select,
.contact button {
  display: block;
  width: 100%;
  margin-bottom: 1rem;
}

.contact input,
.contact textarea,
.contact select {
  padding: 0.5rem;
  border: 1px solid var(--card-border);
  border-radius: 4px;
  background-color: var(--card-bg);
  color: var(--text-color);
}

.contact button {
  background-color: var(--accent-color);
  color: #fff;
  border: none;
  padding: 0.75rem;
  font-weight: bold;
  border-radius: 4px;
  cursor: pointer;
}

.contact button:hover {
  opacity: 0.9;
}

/* === Spinner and Fade Effects === */
.form-disabled {
  opacity: 0.5;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

#contact-form {
  transition: opacity 0.4s ease;
}

.spinner-container {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
  text-align: center;
  margin-top: 1rem;
}

.spinner-container.show {
  opacity: 1;
  visibility: visible;
}

.loading-spinner {
  border: 4px solid #f3f3f3;
  border-top: 4px solid #0066cc;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* === Dark Mode Toggle === */
.dark-mode-toggle {
  margin: 1rem auto;
  text-align: center;
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0;
  right: 0; bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px; width: 18px;
  left: 3px; bottom: 3px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--accent-color);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

/* === Brand Bar === */
.brand-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  margin: 2rem 0;
  padding: 1rem;
}

.brand-bar img {
  max-height: 40px;
  object-fit: contain;
  filter: grayscale(100%);
  transition: filter 0.3s ease, transform 0.3s ease;
}

.brand-bar img:hover {
  filter: grayscale(0%);
  transform: scale(1.05);
}

.brand-bar img.logo {
  height: 40px;
  width: auto;
  object-fit: contain;
  filter: grayscale(100%);
  transition: filter 0.3s ease, transform 0.3s ease;
  border-radius: 4px;
}

.brand-bar img.logo:hover {
  filter: grayscale(0%);
  transform: scale(1.05);
}

.brand-bar img.logo.nvidia { transform: scale(1.3); }
.brand-bar img.logo.corsair { transform: scale(1.4); }
.brand-bar img.logo.seagate { transform: scale(1.4); }
.brand-bar img.logo.crucial { transform: scale(1.1); }
.brand-bar img.logo.msi { transform: scale(1.2); }

/* === Responsive Layout === */
@media (max-width: 600px) {
  nav {
    flex-direction: column;
    gap: 1rem;
  }
  header img {
    max-width: 150px;
  }
}

footer {
  text-align: center;
  padding: 2rem 1rem;
  background-color: var(--card-bg);
  border-top: 1px solid var(--card-border);
}