/*
============================================
AI Solutions Portfolio - Stylesheet
============================================

=== TABLE OF CONTENTS ===
1.  CSS Variables
2.  Global Styles
3.  Typography
4.  Header & Navigation
5.  Footer
6.  Hero Section (Home Page)
7.  Services Section
8.  About Page
9.  Contact Form
10. Responsive Design
============================================
*/

/* Removed custom @font-face to avoid 404s when assets/fonts are missing; using system stack */

/* 1. CSS Variables */
:root {
  --primary-bg-color: #0d1117; /* Very dark blue, almost black */
  --secondary-bg-color: #161b22; /* Dark grey for cards/containers */
  --accent-color: #58a6ff; /* A bright, friendly blue */
  --primary-text-color: #c9d1d9; /* Light grey for primary text */
  --secondary-text-color: #8b949e; /* Medium grey for secondary text */
  --border-color: #30363d;
  --font-family: "Segoe UI", "Roboto", "Helvetica Neue", sans-serif;
  --header-height: 70px;
}

/* 2. Global Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--primary-bg-color);
  color: var(--primary-text-color);
  line-height: 1.6;
  margin: 0;
}

/* Improve touch interactions */
* {
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

/* Buttons */
.btn,
.btn-secondary {
  display: inline-block;
  padding: 0.9rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: transform 0.15s ease, box-shadow 0.2s ease,
    background-color 0.2s ease, color 0.2s ease;
}

.btn {
  background: var(--accent-color);
  color: #0b1620;
  box-shadow: 0 4px 10px rgba(88, 166, 255, 0.25);
}

.btn:hover,
.btn:focus-visible {
  background: #79c0ff;
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(121, 192, 255, 0.28);
}

.btn-secondary {
  background: transparent;
  color: var(--primary-text-color);
  border: 1px solid var(--accent-color);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: rgba(88, 166, 255, 0.1);
  color: #fff;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-color);
  color: #fff;
  padding: 8px 16px;
  z-index: 10000;
  border-radius: 0 0 4px 0;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  border: 0;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #79c0ff; /* Lighter blue on hover */
}

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

ul {
  list-style: none;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 0;
}

/* 3. Typography */
h1,
h2,
h3,
h4 {
  color: var(--primary-text-color);
  margin-bottom: 1rem;
  line-height: 1.2;
}

h1 {
  font-size: 3rem;
}

h2 {
  font-size: 2.2rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 2rem;
}

h3 {
  font-size: 1.5rem;
  color: var(--accent-color);
}

p {
  margin-bottom: 1rem;
  color: var(--secondary-text-color);
}

/* 4. Header & Navigation */
.main-header {
  background-color: var(--secondary-bg-color);
  border-bottom: 1px solid var(--border-color);
  padding: calc(env(safe-area-inset-top, 0px) / 2) 5% 0 5%;
  height: var(--header-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-text-color);
}

/* Constrain image logo in header */
.logo img {
  display: block;
  height: 36px;
  max-height: calc(var(--header-height) - 24px);
  width: auto;
  border-radius: 6px;
}

@media (max-width: 480px) {
  .logo img {
    height: 28px;
  }
}

.main-nav {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.main-nav ul {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.main-nav a {
  font-size: 1rem;
  font-weight: 500;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  color: var(--primary-text-color);
  text-decoration: none;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary-text-color);
  border-bottom-color: var(--accent-color);
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Mobile Nav */
.nav-toggle {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
}

.hamburger {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--primary-text-color);
  position: relative;
  transition: transform 0.3s ease;
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  width: 25px;
  height: 2px;
  background-color: var(--primary-text-color);
  left: 0;
  transition: transform 0.3s ease, top 0.3s ease;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  top: 8px;
}

/* 6. Hero Section (Home Page) */
main {
  padding-top: var(--header-height);
}

.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 60vh;
  min-height: 350px;
  padding: 0 1rem;
  background-color: var(--primary-bg-color);
  color: #fff;
}

.hero-content {
  max-width: 800px;
}

.hero-title {
  font-size: clamp(2rem, 6vw, 3.2rem); /* Slightly smaller for small screens */
  font-weight: 700;
  margin-bottom: 1rem;
  color: #fff;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--primary-text-color);
  margin-bottom: 2.5rem;
  font-weight: 400;
}

/* 7. Services Section */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.service-card {
  background-color: var(--secondary-bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

.service-card h3 {
  margin-bottom: 0.5rem;
}

/* Add consistent top margin to main sections */
main > .container > section {
  margin-top: 4rem;
}

/* 8. About & Services Page */
.page-header {
  text-align: center;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.service-item {
  display: flex;
  gap: 2rem;
  background-color: var(--secondary-bg-color);
  padding: 2rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 2rem;
}

.service-icon {
  font-size: 2.5rem;
  color: var(--accent-color);
  flex-shrink: 0;
  margin-top: 5px;
}

.service-content h4 {
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--primary-text-color);
  font-size: 1.1rem;
}

.service-content ul {
  list-style-type: disc;
  padding-left: 20px;
}

.service-content ul li {
  margin-bottom: 0.5rem;
  color: var(--secondary-text-color);
}

.offline-highlight {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.offline-highlight h4 {
  color: var(--accent-color);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.offline-highlight p {
  color: var(--secondary-text-color);
  margin-bottom: 0;
}

#portfolio {
  margin-top: 4rem;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.portfolio-item {
  background-color: var(--secondary-bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.portfolio-item:hover {
  transform: translateY(-5px);
}

.portfolio-item img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background-color: #333; /* Placeholder bg */
}

.portfolio-info {
  padding: 1.5rem;
}

.portfolio-info h4 {
  color: var(--accent-color);
  margin-bottom: 0.5rem;
}

#about-page .container section {
  margin-bottom: 3rem;
}

.hardware-highlight {
  background-color: #010409; /* Even darker shade for highlight */
  border-left: 4px solid var(--accent-color);
  padding: 1.5rem;
  margin-top: 2rem;
  border-radius: 0 8px 8px 0;
}

.hardware-highlight h3 {
  color: var(--primary-text-color);
}

#usp ul {
  list-style: none;
  padding-left: 0;
}

#usp li {
  background-color: var(--secondary-bg-color);
  padding: 1rem;
  margin-bottom: 1rem;
  border-radius: 5px;
  border-left: 3px solid var(--accent-color);
}

#usp li strong {
  color: var(--primary-text-color);
  display: block;
  margin-bottom: 0.25rem;
}

/* 9. Contact Form */
.contact-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  margin-top: 2rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--primary-text-color);
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.8rem;
  background-color: var(--primary-bg-color);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  color: var(--primary-text-color);
  font-family: inherit;
  font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 5px var(--accent-color);
}

#contact-info {
  background-color: var(--secondary-bg-color);
  padding: 2rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

#contact-info h2 {
  font-size: 1.8rem;
  border: none;
}

#contact-info p {
  margin-bottom: 1rem;
}

.service-note {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

/* Resources page additions */
.table-wrap {
  overflow-x: auto;
  margin: 1rem 0 2rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--secondary-bg-color);
}
.compare-table th,
.compare-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}
.compare-table thead th {
  background: #0f141b;
  color: var(--primary-text-color);
  position: sticky;
  top: 0;
  z-index: 1;
}
.chip {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  margin: 0 0.25rem 0.25rem 0;
  border-radius: 999px;
  background: rgba(88, 166, 255, 0.15);
  color: #b9d9ff;
  font-size: 0.85rem;
}
.muted {
  color: var(--secondary-text-color);
  font-size: 0.95rem;
}

/* 10. Responsive Design */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .main-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--secondary-bg-color);
    flex-direction: column;
    border-bottom: 1px solid var(--border-color);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    z-index: 999;
  }

  .main-nav.active {
    display: flex !important;
  }

  .main-nav ul {
    flex-direction: column;
    width: 100%;
  }

  .main-nav ul li {
    text-align: center;
    width: 100%;
  }

  .main-nav ul li a {
    display: block;
    padding: 1.1rem 1rem;
    width: 100%;
    border-bottom: 1px solid var(--border-color);
    font-size: 1.05rem;
  }

  .main-nav ul li:last-child a {
    border-bottom: none;
  }

  .nav-toggle {
    display: block !important;
    padding: 0.5rem;
  }

  .nav-toggle.is-active .hamburger {
    transform: rotate(45deg);
  }

  .nav-toggle.is-active .hamburger::before {
    top: 0;
    transform: rotate(90deg);
  }

  .nav-toggle.is-active .hamburger::after {
    top: 0;
    transform: rotate(90deg);
    opacity: 0;
  }

  h1 {
    font-size: clamp(1.9rem, 6vw, 2.4rem);
  }

  h2 {
    font-size: 1.8rem;
  }

  .hero {
    min-height: 50vh;
    height: auto;
    padding: 2.25rem 1rem 2.5rem;
  }
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .service-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

/* FORCE desktop navigation to be visible */
@media (min-width: 769px) {
  .main-nav {
    display: flex !important;
  }
  
  .nav-toggle {
    display: none !important;
  }
  
  /* Reset any mobile classes that might be stuck */
  .main-nav.active {
    display: flex !important;
    position: static !important;
    height: auto !important;
    background: transparent !important;
    flex-direction: row !important;
  }
}

/* Utility: lock body scroll when mobile nav is open */
body.no-scroll {
  overflow: hidden;
}

/* 5. Footer */
.main-footer {
  background-color: var(--secondary-bg-color);
  border-top: 1px solid var(--border-color);
  text-align: center;
  padding: 2rem 1rem;
  margin-top: 4rem;
}

.footer-socials {
  margin-bottom: 1rem;
}

.footer-socials a {
  margin: 0 0.75rem;
  font-size: 1.5rem;
}

.copyright {
  color: var(--secondary-text-color);
  font-size: 0.9rem;
}

/* Utility Classes */
.btn {
  display: inline-block;
  background-color: var(--accent-color);
  color: #fff;
  padding: 0.8rem 1.6rem;
  border-radius: 5px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: background-color 0.3s ease, transform 0.3s ease;
  border: 2px solid var(--accent-color);
}

.btn:hover {
  background-color: #79c0ff;
  color: #fff;
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--accent-color);
}

.btn-secondary:hover {
  background-color: var(--accent-color);
  color: #fff;
}