/* =======================
   Global & Reset Styles
======================= */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Poppins', sans-serif;
  line-height: 1.6;
  background-color: #f5f7fa; /* Softer light background */
  color: #1f2937; /* Dark slate gray for better readability */
  min-height: 100vh;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

/* =======================
   Links Styling
======================= */
a {
  color: #3b82f6; /* Tailwind Blue 500 - Modern, vibrant blue */
  text-decoration: none;
  transition: color 0.25s ease, text-decoration 0.25s ease;
  cursor: pointer;
  outline-offset: 2px;
}

a:hover,
a:focus {
  color: #2563eb; /* Tailwind Blue 600 - Darker on hover */
  text-decoration: underline;
  outline: none;
}

/* =======================
   Button Styling
======================= */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  border-radius: 10px;
  cursor: pointer;
  border: none;
  text-align: center;
  user-select: none;
  transition:
    background-color 0.3s ease,
    color 0.3s ease,
    box-shadow 0.3s ease,
    transform 0.2s ease;
  text-decoration: none;
  color: #fff;
  background-color: #3b82f6; /* Blue 500 */
  box-shadow: 0 4px 8px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: #2563eb; /* Blue 600 */
  box-shadow: 0 6px 12px rgba(37, 99, 235, 0.5);
  transform: translateY(-2px);
  outline: none;
}

/* =======================
   Focus States for Accessibility
======================= */
a:focus,
button:focus,
article.feature-card:focus {
  outline: 3px solid #3b82f6; /* Brighter blue focus ring */
  outline-offset: 3px;
}

/* Remove default button focus outline for better custom outline */
button:focus-visible,
a:focus-visible {
  outline-offset: 3px;
  outline-color: #3b82f6;
}

/* =======================
   Header Styles
======================= */
header {
  background-color: #1e293b; /* Darker navy-gray for modern look */
  padding: 1.25rem 0;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
  position: sticky;
  top: 0;
  z-index: 1100;
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Site Title / Logo */
.site-title {
  font-weight: 800;
  font-size: 1.875rem; /* ~30px */
  color: #e0e7ff;
  letter-spacing: 3px;
  text-transform: uppercase;
  user-select: none;
  transition: color 0.3s ease;
  text-decoration: none;
}

.site-title:hover,
.site-title:focus {
  color: #6366f1;
  cursor: pointer;
  outline: none;
}

/* Navigation List */
.nav-list {
  list-style: none;
  display: flex;
  gap: 2.5rem;
  margin: 0;
  padding: 0;
}

/* Navigation Links */
.nav-link {
  font-weight: 600;
  color: #d1d5db;
  font-size: 1.125rem;
  padding: 0.4rem 0;
  position: relative;
  transition: color 0.3s ease;
  outline-offset: 3px;
  text-decoration: none;
}

/* Underline effect on hover and focus */
.nav-link::after {
  content: '';
  position: absolute;
  width: 0%;
  height: 3px;
  bottom: -6px;
  left: 0;
  background-color: #6366f1;
  border-radius: 4px;
  transition: width 0.35s ease;
}

.nav-link:hover,
.nav-link:focus {
  color: #6366f1;
  outline: none;
}

.nav-link:hover::after,
.nav-link:focus::after {
  width: 100%;
}

/* Hamburger Icon (hidden on desktop) */
.menu-icon {
  display: none;
  font-size: 1.8rem;
  background: none;
  border: none;
  color: #ffffff;
  cursor: pointer;
}

/* ============ Responsive Styles ============ */
@media (max-width: 768px) {
  /* Mobile nav default (hidden) */
  .nav-list {
    flex-direction: column;
    align-items: center;
    background-color: #1e293b;
    width: 100%;
    position: absolute;
    top: 100%;
    left: 0;
    padding: 0; /* will animate open */
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    overflow: hidden;

    /* Start closed */
    max-height: 0;
    opacity: 0;
    transform: translateY(-10px);
    transition: max-height 0.35s ease, opacity 0.35s ease, transform 0.35s ease;
  }

  /* Show nav list when "show" class is added */
  .nav-list.show {
    max-height: 500px; /* enough for all menu items */
    opacity: 1;
    transform: translateY(0);
    padding: 1rem 0;
  }

  /* Mobile links bigger for touch devices */
  .nav-link {
    display: block;
    width: 100%;
    text-align: center;
    padding: 0.8rem 0;
    font-size: 1.2rem;
    color: #f1f5f9;
    transition: background-color 0.25s ease, color 0.25s ease;
  }

  /* Mobile hover effect */
  .nav-link:hover,
  .nav-link:focus {
    background-color: rgba(99, 102, 241, 0.15);
    color: #6366f1;
  }

  /* Hide underline animation for mobile */
  .nav-link::after {
    display: none;
  }

  /* Show hamburger icon only on mobile */
  .menu-icon {
    display: block;
  }
}



/* =======================
   Hero Section Styles
======================= */
.hero-section {
  background: linear-gradient(135deg, #caefff 0%, #b5e2f7 100%); /* sky blue gradient */
  color: #f0f9ff; /* very light sky blue for text */
  padding: 6rem 1.5rem;
  text-align: center;
  border-radius: 0 0 50% 50% / 20% 20% 80% 80%;
  margin-bottom: 5rem;
  box-shadow: inset 0 0 40px rgb(255 255 255 / 0.15);
}

/* Main heading */
.hero-title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 800;
  margin-bottom: 1.25rem;
  line-height: 1.15;
  color: #022c43; /* dark navy for strong contrast */
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  letter-spacing: 0.05em;
  user-select: none;
}

/* Subheading */
.hero-subtitle {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  margin-bottom: 3rem;
  font-weight: 500;
  color: #2c2d2e; /* lighter sky blue */
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
  line-height: 1.4;
}

/* Call-to-action button */
.btn-primary {
  font-size: 1.125rem;
  padding: 1rem 2.25rem;
  background-color: #0ea5e9; /* sky blue */
  box-shadow: 0 4px 10px rgb(14 165 233 / 0.5);
  border-radius: 12px;
  font-weight: 700;
  transition: background-color 0.3s ease, box-shadow 0.3s ease, transform 0.2s ease;
  user-select: none;
  text-decoration: none;
  color: #ffffff;
  display: inline-block;
  cursor: pointer;
  border: none;
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: #cfe3ec; /* deeper sky blue on hover */
  box-shadow: 0 6px 20px rgba(247, 252, 255, 0.7);
  transform: scale(1.07);
  outline: none;
  text-decoration: none;
}





/* =======================
   Features Section Styles
======================= */
.features-section {
  padding-bottom: 5rem;
  background-color: #f3f4f6; /* Light gray background for subtle contrast */
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 3.5rem;
  color: #111827; /* Very dark gray for strong heading contrast */
  letter-spacing: 0.03em;
  user-select: none;
}

/* Features grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2.5rem;
  max-width: 1100px;
  margin: 0 auto;
}

/* Feature cards */
.feature-card {
  background-color: #ffffff;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgb(0 0 0 / 0.05); /* Softer shadow */
  padding: 2.5rem 2rem;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  user-select: none;
  border: 1px solid transparent;
}

.feature-card:hover,
.feature-card:focus {
  transform: translateY(-6px) scale(1.06);
  box-shadow: 0 12px 35px rgb(14 165 233 / 0.3); /* subtle sky blue glow on hover */
  outline: none;
  border-color: #0ea5e9; /* subtle blue border on focus/hover */
}

/* Feature icons */
.feature-icon {
  font-size: 4rem;
  color: #0ea5e9; /* sky blue color for icons */
  transition: color 0.3s ease;
}

.feature-card:hover .feature-icon,
.feature-card:focus .feature-icon {
  color: #0284c7; /* darker blue on hover/focus */
}

/* Feature title */
.feature-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: #111827;
  margin-top: 0.5rem;
  letter-spacing: 0.02em;
}

/* Feature description */
.feature-description {
  font-size: 1rem;
  color: #4b5563; /* medium gray for text */
  line-height: 1.5;
  max-width: 320px;
  margin: 0 auto;
  user-select: text;
}

/* =======================
   Why Choose Us Section
======================= */
.why-choose-us-section {
  background-color: #e0f2fe; /* sky blue-100, very light */
  color: #0c4a6e; /* sky blue-900, dark text */
  padding: 5rem 1rem;
  border-radius: 16px;
  margin-bottom: 5rem;
  box-shadow: 0 8px 25px rgb(14 165 233 / 0.15); /* subtle sky blue shadow */
  text-align: center;
  user-select: none;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: #0284c7; /* sky blue-600 */
  margin-bottom: 2rem;
  letter-spacing: 0.03em;
}

/* Benefits list */
.benefits-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2.5rem;
  list-style: none;
  max-width: 900px;
  margin: 0 auto;
  padding: 0;
}

.benefits-list li {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-weight: 600;
  font-size: 1.25rem;
  min-width: 180px;
  color: #0369a1; /* sky blue-700 */
  transition: color 0.3s ease;
  cursor: default;
}

.benefits-list li:hover,
.benefits-list li:focus {
  color: #0284c7; /* lighter sky blue on hover */
  outline: none;
}

/* Benefit icons */
.benefit-icon {
  font-size: 2.2rem;
  color: #0ea5e9; /* sky blue-500 */
  transition: color 0.3s ease;
}

.benefits-list li:hover .benefit-icon,
.benefits-list li:focus .benefit-icon {
  color: #0369a1; /* darker sky blue on hover */
}

/* =======================
   Footer Styles
======================= */
.footer {
  background-color: #1e293b; /* Dark slate blue */
  color: #cbd5e1;            /* Light gray-blue */
  padding: 2.5rem 1rem;
  border-radius: 20px 20px 0 0;
  text-align: center;
  font-size: 0.9rem;
  box-shadow: inset 0 2px 8px rgb(255 255 255 / 0.05);
  user-select: none;
}

.footer-container {
  max-width: 900px;
  margin: 0 auto;
}

/* Footer Navigation List */
.footer-nav-list {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.footer-nav-link {
  color: #cbd5e1;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  padding: 0.25rem 0;
  position: relative;
  transition: color 0.3s ease;
}

/* Underline animation */
.footer-nav-link::after {
  content: '';
  position: absolute;
  width: 0%;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: #3b82f6; /* sky-500 */
  transition: width 0.3s ease;
}

.footer-nav-link:hover,
.footer-nav-link:focus {
  color: #3b82f6;
  outline: none;
}

.footer-nav-link:hover::after,
.footer-nav-link:focus::after {
  width: 100%;
}

/* Social Media Container */
.footer-social {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

/* Social Media Links */
.footer-social a {
  color: #cbd5e1;
  font-size: 1.8rem;
  transition: color 0.3s ease, transform 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Brand Hover Colors */
.footer-social a[aria-label="LinkedIn"]:hover {
  color: #0077b5;
}

.footer-social a[aria-label="GitHub"]:hover {
  color: #fff; /* GitHub white */
}

.footer-social a[aria-label="Twitter"]:hover {
  color: #1da1f2;
}

.footer-social a:hover,
.footer-social a:focus {
  transform: scale(1.15);
  outline: none;
}

/* Copyright */
.footer-copy {
  color: #94a3b8;
  font-size: 0.85rem;
  user-select: none;
}

/* ===== Scroll to Top Button ===== */
#scrollTopBtn {
  display: none;
  position: fixed;
  bottom: 25px;
  right: 25px;
  z-index: 99;
  font-size: 18px;
  border: none;
  outline: none;
  background-color: #3b82f6;
  color: white;
  cursor: pointer;
  padding: 12px 15px;
  border-radius: 50%;
  transition: background-color 0.3s ease, transform 0.3s ease;
}

#scrollTopBtn:hover {
  background-color: #2563eb;
  transform: translateY(-3px);
}

/* ===== Filter Buttons ===== */
.filter-buttons {
  text-align: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.filter-buttons button {
  background-color: #f1f5f9;
  border: none;
  padding: 0.5rem 1.2rem;
  margin: 0.3rem;
  border-radius: 20px;
  cursor: pointer;
  font-weight: 500;
  color: #334155;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.filter-buttons button:hover,
.filter-buttons button.active {
  background-color: #3b82f6;
  color: white;
}

/* ===== Feature Cards ===== */
.feature-card {
  background: white;
  padding: 1.5rem;
  border-radius: 12px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
  opacity: 1;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.15);
}

.feature-card.fade-out {
  opacity: 0;
  transform: scale(0.95);
}

.feature-icon {
  font-size: 2rem;
  color: #3b82f6;
  margin-bottom: 1rem;
}

/* ===== Responsive Layout ===== */
@media (max-width: 768px) {
  .filter-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
  }

  .filter-buttons button {
    font-size: 0.9rem;
    padding: 0.4rem 1rem;
  }

  .feature-card {
    padding: 1.2rem;
  }

  .feature-icon {
    font-size: 1.6rem;
  }
}

@media (max-width: 480px) {
  .filter-buttons button {
    font-size: 0.85rem;
    padding: 0.4rem 0.8rem;
  }

  .feature-card {
    padding: 1rem;
  }
}


/* =======================
   Responsive Design
======================= */

/* Large Tablets & Small Laptops (max-width: 1024px) */
@media (max-width: 1024px) {
  .nav-list {
    gap: 1.5rem;
  }

  .hero-title {
    font-size: clamp(1.8rem, 4.5vw, 3rem);
  }

  .hero-subtitle {
    font-size: 1.125rem;
    max-width: 500px;
  }

  .features-grid {
    gap: 2rem;
  }

  .feature-card {
    padding: 2rem 1.5rem;
  }
}

/* Tablets (max-width: 768px) */
@media (max-width: 768px) {
  /* Header */
  .header-container {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-list {
    flex-direction: column;
    gap: 1rem;
    align-items: center;
  }

  /* Hero */
  .hero-section {
    padding: 4rem 1rem;
    border-radius: 0;
  }

  .hero-title {
    font-size: clamp(1.5rem, 5vw, 2.5rem);
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  /* Features */
  .features-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  /* Why Choose Us */
  .benefits-list {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  /* Footer */
  .footer-nav-list {
    flex-direction: column;
    gap: 1rem;
  }

  .footer-social {
    gap: 1rem;
  }
}

/* Mobile (max-width: 480px) */
@media (max-width: 480px) {
  /* General */
  body {
    font-size: 0.95rem;
  }

  /* Header */
  .site-title {
    font-size: 1.5rem;
    letter-spacing: 2px;
  }

  /* Buttons */
  .btn,
  .btn-primary {
    padding: 0.6rem 1.2rem;
    font-size: 1rem;
  }

  /* Hero */
  .hero-section {
    padding: 3rem 1rem;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  /* Features */
  .feature-card {
    padding: 1.5rem 1rem;
  }

  .feature-title {
    font-size: 1.2rem;
  }

  .feature-description {
    font-size: 0.95rem;
  }

  /* Footer */
  .footer {
    padding: 2rem 1rem;
  }

  .footer-copy {
    font-size: 0.75rem;
  }
}