/* --- CSS Custom Properties (Variables) --- */
:root {
  /* Modern & clean color scheme for Class 7 */
  --primary-color: #007bff; /* Vibrant blue */
  --secondary-color: #28a745; /* Fresh green */
  --accent-color: #6f42c4; /* Deep purple */
  --background-gradient-body: linear-gradient(
    135deg,
    #f8f9fa 0%,
    #e9ecef 100%
  ); /* Light, subtle grey gradient */
  --header-bg: rgba(255, 255, 255, 0.95); /* Pure white, slightly transparent */
  --card-bg: #ffffff; /* Clean white for cards */
  --text-dark: #343a40; /* Darker, modern text */
  --text-light: #ffffff; /* White for inverse text */
  --text-muted: #6c757d; /* Muted grey for descriptions */
  --font-heading: "Share Tech", sans-serif;
  --font-body: "Poppins", sans-serif;
  --border-radius-main: 0.75rem;
  --border-radius-small: 0.375rem;
  --shadow-soft: 0 4px 15px rgba(0, 0, 0, 0.08);
  --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.15);
  --transition-speed: 0.3s;
  --transition-fast: 0.2s; /* Added for quicker transitions */
  --transition-slow: 0.4s; /* Added for slower, more deliberate transitions */
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-image: var(--background-gradient-body);
  background-attachment: fixed; /* Keep gradient fixed during scroll */
  color: var(--text-dark);
  line-height: 1.6;
  padding: 1rem; /* Add some padding around the body */
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast) ease,
    transform var(--transition-fast) ease;
}

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

/* --- Header --- */
.header {
  padding: 0.5rem 0; /* Add some vertical padding to the outer header div */
}
.header_content {
  display: flex;
  flex-wrap: wrap; /* Allow items to wrap on smaller screens */
  justify-content: space-between;
  align-items: center;
  max-width: 1200px; /* Constrain header width */
  margin: 0 auto; /* Center the header */
  background-color: var(--header-bg);
  backdrop-filter: blur(5px); /* Frosted glass effect */
  border-radius: var(--border-radius-main);
  padding: 0.75rem 1.5rem;
  box-shadow: var(--shadow-soft);
  position: relative; /* Needed for absolute positioning of expanded menu */
  z-index: 100; /* Ensure header is above other content */
  transition: all var(--transition-speed) ease; /* Smooth transition for header itself */
}

.logo {
  display: flex;
  align-items: center;
  font-weight: 700; /* Bolder for Poppins */
  font-size: 1.6rem;
  color: var(--primary-color);
  transition: transform var(--transition-speed) ease;
  z-index: 2; /* Ensure logo is above the expanding menu */
}
.logo:hover,
.logo:focus-visible {
  transform: scale(1.05) translateX(3px); /* Scale and slight move */
  color: var(--accent-color); /* Change color on hover */
}

.logo_icon {
  width: 45px; /* Slightly smaller */
  height: 45px;
  border-radius: var(--border-radius-small);
  margin-right: 0.75rem;
  transition: transform var(--transition-speed) ease; /* Transition for icon */
}
.logo:hover .logo_icon {
  transform: rotate(10deg); /* Slight rotation on icon hover */
}

.nav {
  display: flex;
  flex-wrap: wrap; /* Allow nav links to wrap */
  gap: 1.5rem; /* Reduced gap for better wrapping */
  margin: 0.5rem 0; /* Add margin for wrapped state */
}

.nav_link {
  font-size: 1.1rem; /* Slightly smaller */
  font-weight: 600;
  color: var(--text-dark); /* Changed to text-dark for consistency */
  padding: 0.5rem 0.25rem;
  position: relative;
  transition: color var(--transition-fast) ease; /* Transition for link text color */
}

.nav_link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width var(--transition-speed) ease-out;
}

.nav_link:hover::after,
.nav_link:focus-visible::after {
  width: 100%;
}
.nav_link:hover,
.nav_link:focus-visible {
  color: var(--primary-color);
  transform: translateY(-2px); /* Lift link slightly */
}

/* Updated Contact Button Styling with Enhanced Effects */
.contact_button {
  font-size: 1rem;
  color: var(--text-light); /* White text */
  background: linear-gradient(
    45deg,
    var(--primary-color) 0%,
    var(--accent-color) 100%
  ); /* Vibrant blue to deep purple gradient */
  border: none;
  border-radius: 2rem; /* Pill-like shape */
  padding: 0.8rem 1.8rem;
  font-weight: 600;
  text-transform: uppercase; /* Uppercase text */
  letter-spacing: 0.05em; /* Subtle letter spacing */
  cursor: pointer;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2); /* Softer, more prominent shadow */
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); /* Smooth, elegant transition */
  transform: scale(1); /* Initial scale for subtle hover effect */
  position: relative; /* Needed for pseudo-element effects */
  overflow: hidden; /* Hide overflow for shimmer effect */
  z-index: 1; /* Ensure content is above pseudo-element */
}

/* Shimmer effect for contact button */
.contact_button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -75%;
  width: 50%;
  height: 100%;
  background: rgba(255, 255, 255, 0.3); /* White shimmer */
  transform: skewX(-20deg);
  transition: left 0.6s cubic-bezier(0.25, 0.8, 0.25, 1); /* Slower shimmer transition */
  z-index: -1; /* Place behind text */
}

.contact_button:hover::before {
  left: 125%; /* Move shimmer across the button */
}

.contact_button:hover,
.contact_button:focus-visible {
  background: linear-gradient(
    45deg,
    var(--accent-color) 0%,
    var(--primary-color) 100%
  ); /* Reverse gradient on hover */
  transform: translateY(-3px) scale(1.05); /* Lift up and slightly enlarge */
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35); /* More pronounced shadow on hover */
  color: var(--text-light); /* Ensure text remains visible on hover */
  outline: none; /* Remove default outline for cleaner focus-visible */
}

.contact_button:active {
  transform: translateY(0) scale(0.98); /* Slightly press down on click */
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15); /* Reduced shadow on active */
  background: linear-gradient(
    45deg,
    color-mix(in srgb, var(--accent-color) 90%, black) 0%,
    color-mix(in srgb, var(--primary-color) 90%, black) 100%
  ); /* Darker gradient on active */
}

/* Hamburger button styles with subtle hover */
.hamburger {
  display: none; /* Hidden by default, shown on small screens */
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 2; /* Ensure it's above the menu when open */
  transition: transform var(--transition-fast) ease; /* Add transition */
}

.hamburger img {
  width: 30px;
  height: 30px;
  /* Adjust filter based on header_bg or desired color for Hamburger icon */
  filter: invert(15%) sepia(20%) saturate(150%) hue-rotate(200deg)
    brightness(80%); /* Example: dark blueish tint */
  transition: filter var(--transition-fast) ease; /* Transition for icon filter */
}

.hamburger:hover {
  transform: scale(1.1); /* Slightly enlarge on hover */
}
.hamburger:hover img {
  filter: invert(0) sepia(100%) saturate(700%) hue-rotate(200deg)
    brightness(100%); /* Make it more vibrant on hover */
}

/* --- Main Section --- */
.all_section {
  padding-top: 2rem;
}

.main_section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
  padding: 1rem 0;
}

.heading_line {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  color: var(--primary-color); /* Changed to primary-color for consistency */
  text-align: center;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1),
    0 0 25px color-mix(in srgb, var(--primary-color) 20%, transparent),
    0 0 50px color-mix(in srgb, var(--secondary-color) 20%, transparent);
  letter-spacing: 1px;
}

/* This video_overlay seems to be a remnant, hiding it by default */
.video_overlay {
  display: none;
}

/* --- Cards --- */
.cards {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.card_container {
  background: var(--card-bg);
  border-radius: var(--border-radius-main);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-speed) ease,
    box-shadow var(--transition-speed) ease;
}

.card_container:hover {
  transform: translateY(-8px) scale(1.03); /* More pronounced lift and scale */
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2); /* Deeper shadow on hover */
}

.card_image_container {
  position: relative;
  overflow: hidden;
  height: 180px;
  background-color: #f8f9fa; /* Matches new background */
}

.card_image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform var(--transition-slow) ease-out; /* Slower image zoom */
}

.card_container:hover .card_image {
  transform: scale(1.15); /* More pronounced image zoom */
}

.card_body_container {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  gap: 1rem;
}

.card_title_container {
  flex-grow: 1;
}

.card_title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.card_title_anchor {
  /* Add base transition for consistency */
  transition: color var(--transition-fast) ease;
}
.card_title_anchor:hover .card_title {
  color: var(--primary-color);
}

.card_desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Card Footer Styling */
.card_footer_container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid #e0e0e0;
  margin-top: auto;
}

.author_container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.author_avtar_container {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.08);
  transition: transform var(--transition-fast) ease; /* Avatar transition */
}
.author_container:hover .author_avtar_container {
  transform: scale(1.1); /* Slightly enlarge avatar on hover */
}
.author_avtar {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author_info_container {
  display: flex;
  flex-direction: column;
}

.author_name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--secondary-color);
  transition: color var(--transition-fast) ease;
}
.author_container:hover .author_name {
  color: var(--primary-color); /* Change color on hover */
}

.author_date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.card_tag_container {
  font-size: 0.8rem;
  background-color: color-mix(
    in srgb,
    var(--primary-color) 15%,
    transparent
  );
  color: color-mix(in srgb, var(--primary-color) 100%, black 5%);
  border-radius: var(--border-radius-small);
  padding: 0.3rem 0.6rem;
  font-weight: 500;
  transition: all var(--transition-fast) ease; /* Tag transition */
}
.card_container:hover .card_tag_container {
  background-color: var(--primary-color); /* Solid color on card hover */
  color: var(--text-light); /* White text on hover */
}

/* --- Focus Visible (Accessibility) --- */
a:focus-visible,
button:focus-visible,
.card_container:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px
    color-mix(in srgb, var(--primary-color) 30%, transparent);
}
.card_container:focus-visible {
  outline: none;
}
.card_image_container:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* --- Media Queries for Responsiveness --- */

/* Default large screen styles for header elements are inline (flex row) */

/* For tablets and larger phones (hamburger appears, menu stacks) */
@media (max-width: 992px) {
  :root {
    --border-radius-main: 0.6rem;
  }
  .header_content {
    flex-wrap: nowrap;
    justify-content: space-between;
    padding: 1rem;
    position: relative;
    z-index: 100;
    border-radius: var(--border-radius-main);
  }

  .nav,
  .contact_button {
    display: none;
  }

  .hamburger {
    display: block;
  }

  /* Styles for when the navigation is active/open */
  .header_content.active {
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    position: absolute; /* Changed from fixed to absolute */
    top: 0;
    left: 0;
    width: 100%;
    height: auto; /* Let height be determined by content */
    background-color: color-mix(
      in srgb,
      #1a2a3a 95%,
      transparent
    ); /* Darker, slightly blueish opaque background for the opened menu */
    backdrop-filter: blur(8px);
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.4);
    padding-bottom: 1rem; /* Adjust bottom padding as needed */
    border-radius: var(--border-radius-main); /* Keep border radius */
    padding-top: 4.5rem; /* Adjust top padding to account for the header's initial height */
    transition: all var(--transition-speed) ease-in-out;
  }

  .header_content:not(.active) {
    transition: all var(--transition-speed) ease-in-out;
  }

  .header_content.active .logo {
    margin-bottom: 1rem;
    width: 100%;
    text-align: center;
    justify-content: center;
    position: absolute; /* Position logo at the top within the active state */
    top: 0.75rem;
    left: 0;
    color: var(--text-light); /* Logo text white on dark menu */
  }

  .header_content.active .hamburger {
    position: absolute;
    top: 0.75rem;
    right: 1.5rem;
    z-index: 101;
    filter: invert(1);
    transform: rotate(90deg);
  }

  .header_content.active .nav {
    display: flex;
    flex-direction: column;
    padding: 0;
    gap: 0;
    width: 100%;
    align-items: center;
    margin-bottom: 1rem; /* Reduce bottom margin for nav */
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInSlideUp 0.5s forwards ease-out 0.2s;
    margin-top: 3rem; /* Adjust top margin to be below the logo */
  }

  /* Keyframe animation for menu items */
  @keyframes fadeInSlideUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* Delay animation for each nav link */
  .header_content.active .nav_link:nth-child(1) {
    animation-delay: 0.25s;
  }
  .header_content.active .nav_link:nth-child(2) {
    animation-delay: 0.35s;
  }
  .header_content.active .nav_link:nth-child(3) {
    animation-delay: 0.45s;
  }
  /* Continue for more links if needed */

  .header_content.active .nav_link {
    color: var(--text-light);
    font-size: 1.2rem;
    padding: 0.8rem 1.5rem;
    width: 90%;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .header_content.active .nav_link:last-child {
    border-bottom: none;
  }

  .header_content.active .nav_link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--primary-color);
  }

  .header_content.active .contact_button {
    display: block;
    padding: 0.8rem 1.8rem;
    width: fit-content;
    align-self: center;
    color: var(--text-light);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInSlideUp 0.5s forwards ease-out 0.55s;
    margin-top: 1rem; /* Adjust spacing above the contact button */
    margin-bottom: 1rem; /* Add some bottom margin for spacing */
  }

  /* Adjust existing styles for smaller screens */
  .heading_line {
    font-size: clamp(2rem, 6vw, 2.8rem);
  }

  .cards {
    gap: 1.5rem;
    padding: 0 0.5rem;
  }

  .card_image_container {
    height: 160px;
  }
  .card_title {
    font-size: 1.4rem;
  }
  .card_desc {
    font-size: 0.9rem;
  }
  .card_footer_container {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}

/* For small phones */
@media (max-width: 480px) {
  body {
    padding: 0.5rem;
  }
  .header_content {
    padding: 0.75rem;
    border-radius: var(--border-radius-small);
  }
  .logo {
    font-size: 1.4rem;
  }
  .logo_icon {
    width: 35px;
    height: 35px;
  }
  .header_content.active .nav_link {
    font-size: 1.1rem;
    padding: 0.6rem 1rem;
  }
  .header_content.active .contact_button {
    font-size: 0.9rem;
    padding: 0.7rem 1.5rem;
  }

  .heading_line {
    font-size: clamp(1.8rem, 7vw, 2.2rem);
  }

  .cards {
    gap: 1rem;
  }
  .card_container {
    border-radius: var(--border-radius-small);
  }
  .card_image_container {
    height: 140px;
  }
  .card_title {
    font-size: 1.25rem;
  }
}