/*
  Mobile responsiveness layer for GDTA 2026
  - Strictly mobile-only overrides via media queries
  - Desktop styles remain untouched
  Breakpoints allowed:
    @media (max-width: 768px)
    @media (max-width: 480px)
*/

@media (max-width: 768px) {
  /* Prevent horizontal scrolling from fixed-width elements */
  html, body {
    width: 100%;
    overflow-x: hidden;
  }

  body.mobile-nav-open {
    overflow: hidden !important;
    height: 100vh;
  }

  *, *::before, *::after {
    box-sizing: border-box;
  }

  img, video, svg, canvas {
    max-width: 100%;
    height: auto;
  }

  /* Improve tap targets */
  button, .btn, a.btn, .navbar-register-btn, input, select, textarea {
    min-height: 44px;
  }

  /* ===== Navbar (mobile-only) =====
     We keep the existing markup, but override layout for <768.
     JS toggles .is-open on the collapse container.
  */
  .navbar {
    padding-left: 0 !important;
    padding-right: 0 !important;
    position: relative;
    width: 100vw !important;
  }

  /* Force navbar container to span full width */
  .navbar-container,
  .navbar-container .container-fluid,
  .navbar-container .container {
    width: 100% !important;
    max-width: 100% !important;
    margin: 0 !important;
    padding-left: 0 !important;
    padding-right: 0 !important;
  }

  /* Ensure the fixed navbar container edges are solid white on mobile */
  .navbar-container {
    background: #ffffff !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    box-shadow: none !important;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08) !important;
    width: 100vw !important;
    left: 0 !important;
    right: 0 !important;
  }

  /* Slightly smaller brand on mobile to reduce navbar height */
  .navbar-brand img {
    height: 48px !important;
  }

  .navbar-toggler {
    position: absolute !important;
    right: 8px !important;
    top: 6px !important;
    z-index: 1300 !important;
    display: flex !important;
    align-items: center;
    justify-content: center;
    border: none !important;
    background: rgba(0, 0, 0, 0.08) !important;
    border-radius: 8px !important;
    width: 44px !important;
    height: 44px !important;
    padding: 8px !important;
    cursor: pointer !important;
  }

  /* Hamburger icon - solid SVG background */
  .navbar-toggler-icon {
    width: 24px !important;
    height: 18px !important;
    background-image: url("data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23000'%3E%3Cpath d='M3 6h18v2H3V6zm0 5h18v2H3v-2zm0 5h18v2H3v-2z'/%3E%3C/svg%3E") !important;
    background-repeat: no-repeat !important;
    background-position: center !important;
    background-size: 100% 100% !important;
    display: block !important;
    border: none !important;
    box-shadow: none !important;
  }

  /* Some pages use .collapse.navbar-collapse, others use .navbar-collapse with inline display */
  .navbar-collapse {
    position: fixed !important;
    left: 0 !important;
    right: 0 !important;
    width: 100vw !important;
    top: var(--gdta-mobile-nav-top, 72px);
    height: calc(100vh - var(--gdta-mobile-nav-top, 86px));
    max-height: none;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;

    display: none !important;
    flex-direction: column;

    background: #ffffff !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;

    padding: 12px 0 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.12);
    z-index: 1051 !important;
  }

  .navbar-collapse.is-open {
    display: flex !important;
  }

  .navbar-nav {
    width: 100%;
    gap: 4px;
    margin-left: 0 !important;
    pointer-events: auto !important;
  }

  .navbar .navbar-nav .nav-link {
    width: 100%;
    padding: 12px 16px !important;
    border-radius: 10px;
    white-space: normal;
    word-wrap: break-word;
    pointer-events: auto !important;
    cursor: pointer !important;
  }

  .navbar .dropdown-menu {
    position: static !important;
    float: none !important;
    box-shadow: none !important;
    border-radius: 12px;
    margin-top: 6px;
    width: 100% !important;
    max-width: 100% !important;
    padding-left: 0 !important;
    padding-right: 0 !important;
    display: none !important;
    z-index: 1051 !important;
    pointer-events: auto !important;
  }

  /* Show dropdown menu when parent has show class */
  .navbar .dropdown-menu.show {
    display: block !important;
  }

  .navbar .dropdown-item {
    padding: 10px 12px !important;
    pointer-events: auto !important;
    cursor: pointer !important;
  }

  .navbar-register-btn {
    width: 100% !important;
    display: inline-flex !important;
    justify-content: center;
    align-items: center;
    margin: 10px 0 0 0 !important;
    pointer-events: auto !important;
    cursor: pointer !important;
  }

  #mobileBackBtn {
    display: none !important;
  }

  /* Backdrop controlled by JS */
  .mobile-nav-backdrop {
    position: fixed;
    inset: 0;
    background: transparent;
    z-index: 1050;
    opacity: 0;
    pointer-events: none !important;
    transition: opacity 200ms ease;
  }

  .mobile-nav-backdrop.is-open {
    opacity: 1;
    pointer-events: none !important;
  }

  /* ===== Page spacing helpers ===== */
  .container,
  .container-fluid {
    padding-left: 12px !important;
    padding-right: 12px !important;
  }

  /* Avoid huge desktop paddings on mobile */
  .py-5 {
    padding-top: 2rem !important;
    padding-bottom: 2rem !important;
  }

  .p-5 {
    padding: 1.25rem !important;
  }

  /* ===== Hero (home) ===== */
  .hero-section {
    height: auto !important;
    min-height: 0 !important;
    padding: var(--gdta-mobile-nav-top, 72px) 0 0 0 !important;
  }

  .hero-media {
    position: relative !important;
    inset: auto !important;
    width: 100% !important;
    height: auto !important;
    max-height: none !important;
  }

  .hero-media img,
  .hero-media video {
    width: 100% !important;
    height: auto !important;
    object-fit: contain !important;
    object-position: center !important;
    display: block !important;
    background-color: transparent !important;
  }

  /* ===== Intro section typography ===== */
  .intro-section p {
    font-size: 1rem !important;
    line-height: 1.6 !important;
  }

  /* ===== Hackathon hero buttons spacing ===== */
  .hack-hero .btn {
    display: block !important;
    width: 100%;
    margin: 10px 0 !important;
  }

  /* ===== Featured sessions carousel (home + sessions page) ===== */
  .featured-article {
    margin-left: 0 !important;
    margin-right: 0 !important;
  }

  .featured-article .reveal-text {
    opacity: 1 !important;
    transform: none !important;
  }

  .featured-article .carousel-prev {
    left: 8px !important;
    top: 36% !important;
  }

  .featured-article .carousel-next {
    right: 8px !important;
    top: 36% !important;
  }

  .featured-article .carousel-nav-btn {
    width: 44px !important;
    height: 44px !important;
  }

  .featured-article .gradient-border-inner .row {
    display: flex;
    flex-direction: column;
    height: auto !important;
    overflow: visible !important;
  }

  .featured-article .gradient-border-inner .col-lg-5 {
    width: 100% !important;
    height: auto !important;
  }

  .featured-article .gradient-border-inner .col-lg-7 {
    width: 100% !important;
    height: auto !important;
  }

  .featured-article #featured-img {
    width: 100% !important;
    height: 220px !important;
    object-fit: cover;
    min-height: 0 !important;
  }

  /* Keep text readable and prevent overflow */
  #featured-title {
    font-size: clamp(1.25rem, 4.5vw, 1.65rem) !important;
  }

  #featured-description {
    font-size: 0.95rem !important;
    word-wrap: break-word;
  }

  /* ===== Generic card safety ===== */
  .content-card {
    min-height: unset;
  }

  .content-card,
  .shadow-lift,
  .gradient-border,
  .gradient-border-inner {
    max-width: 100% !important;
  }
}

@media (max-width: 480px) {
  .navbar-brand img {
    height: 52px !important;
  }

  .navbar .navbar-nav .nav-link {
    padding: 12px 8px !important;
  }

  /* Slightly tighter spacing */
  .container,
  .container-fluid {
    padding-left: 10px !important;
    padding-right: 10px !important;
  }

  .featured-article #featured-img {
    height: 200px !important;
  }
}

/* Desktop safeguard: ensure navbar expands normally above mobile breakpoint */
@media (min-width: 769px) {
  .navbar-collapse {
    position: static !important;
    display: flex !important;
    flex-direction: row !important;
    width: auto !important;
    max-height: none !important;
    overflow: visible !important;
    background: transparent !important;
    padding: 0 !important;
    border-bottom: none !important;
  }

  .navbar-toggler {
    display: none !important;
  }

  .mobile-nav-backdrop {
    display: none !important;
  }
}