html { scroll-behavior: smooth; }
    body {
      margin: 0;
      background: linear-gradient(120deg, #232526, #414345 80%);
      font-family: 'Montserrat', sans-serif;
      color: #f4f8fb;
    }
    header {
      width: 100%;
      background: rgba(30, 34, 44, 0.98);
      box-shadow: 0 2px 8px rgba(32,183,255,0.10);
      position: fixed;
      top: 0; left: 0;
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding-left: 0.7rem;
      padding-right: 2rem;
      height: 64px;
      flex-direction: row;
    }
    .site-title {
      font-size: 1.5rem;
      font-weight: bold;
      color: #20b7ff;
      letter-spacing: 2px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      max-width: 70vw;
    }
    nav {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    @media (min-width: 801px) {
      nav.closed {
        display: none;
      }
    }
    nav a {
      color: #e0eafc;
      text-decoration: none;
      font-size: 1.05rem;
      font-weight: 500;
      letter-spacing: 1px;
      transition: color 0.2s;
      padding: 0.5rem 0;
      border-bottom: 2px solid transparent;
    }
    nav a:hover, nav a.active {
      color: #20b7ff;
      border-bottom: 2px solid #20b7ff;
    }
    .hamburger {
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      width: 38px;
      height: 38px;
      background: none;
      border: none;
      cursor: pointer;
      margin-left: 0;
      margin-right: 1rem;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 3px;
      margin: 4px 0;
      background: #20b7ff;
      border-radius: 2px;
      transition: 0.3s;
    }
    main {
      margin-top: 80px;
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100%;
    }
    .hero {
      text-align: center;
      padding: 2.5rem 1rem 2rem 1rem;
      max-width: 700px;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: bold;
      color: #20b7ff;
      letter-spacing: 2px;
      margin-bottom: 0.5rem;
      word-break: break-word;
    }
    .hero-welcome {
      font-size: 1.2rem;
      color: #e0eafc;
      margin-bottom: 1.5rem;
    }
    .project-announcement {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1.5rem;
      max-width: 850px;
      margin-top: 0.5rem;
      padding: 1.4rem 1.6rem;
      border-left: 4px solid #20b7ff;
      border-radius: 8px;
      text-align: left;
    }
    .project-announcement .announcement-label {
      margin: 0 0 0.4rem;
      color: #20b7ff;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
    }
    .project-announcement h2 {
      margin: 0 0 0.5rem;
    }
    .project-announcement p:not(.announcement-label) {
      margin: 0;
      line-height: 1.6;
    }
    .announcement-link {
      flex: 0 0 auto;
      color: #20b7ff;
      font-weight: 700;
      text-decoration: underline;
      text-underline-offset: 3px;
    }
    @media (prefers-reduced-motion: no-preference) {
      .project-announcement {
        animation: announcement-enter 800ms ease-out both;
      }
      @keyframes announcement-enter {
        from { opacity: 0; transform: translateY(14px); }
        to { opacity: 1; transform: translateY(0); }
      }
    }
    section {
      background: rgba(30, 34, 44, 0.93);
      border-radius: 18px;
      box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.18);
      max-width: 500px;
      width: 95%;
      margin: 2rem auto;
      padding: 2rem 1.5rem;
      color: #e0eafc;
      text-align: center;
      box-sizing: border-box;
    }
    .magazine-cover {
      width: 120px;
      height: 160px;
      object-fit: cover;
      border-radius: 10px;
      box-shadow: 0 4px 16px rgba(32,183,255,0.15);
      margin-bottom: 1.5rem;
      border: 2px solid #20b7ff;
      background: #222;
      display: inline-block;
    }
    .download-btn {
      display: inline-block;
      background: linear-gradient(90deg, #20b7ff 60%, #1e3c72 100%);
      color: #fff;
      border: none;
      padding: 0.9rem 2.2rem;
      border-radius: 8px;
      font-size: 1.1rem;
      font-weight: bold;
      cursor: pointer;
      text-decoration: none;
      transition: background 0.2s, box-shadow 0.2s;
      box-shadow: 0 2px 8px rgba(32,183,255,0.10);
      margin-top: 1.2rem;
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .download-btn:hover {
      background: linear-gradient(90deg, #1e3c72 60%, #20b7ff 100%);
      box-shadow: 0 4px 16px rgba(32,183,255,0.18);
    }
    h2 {
      color: #20b7ff;
      margin-bottom: 1rem;
      font-size: 1.3rem;
      letter-spacing: 1px;
    }
    .footer {
      margin-top: 2rem;
      color: #b0b9c6;
      font-size: 0.95rem;
      text-align: center;
      margin-bottom: 1.5rem;
    }
    .footer-links {
      display: flex;
      justify-content: center;
      gap: 1rem;
      margin: 0.5rem 0;
    }
    .footer-links a {
      color: #20b7ff;
      text-decoration: underline;
    }
    /* Download section magazine list */
    .magazine-list {
      display: flex;
      flex-direction: column;
      gap: 2rem;
      align-items: center;
      width: 100%;
    }
    .magazine-item {
      display: flex;
      align-items: center;
      gap: 1.2rem;
      background: rgba(36,44,60,0.7);
      border-radius: 12px;
      padding: 1rem 1.5rem;
      width: 100%;
      max-width: 400px;
      box-sizing: border-box;
    }
    .magazine-item img {
      width: 60px;
      height: 80px;
      border-radius: 8px;
      border: 2px solid #20b7ff;
      object-fit: cover;
      background: #222;
      margin-bottom: 0;
      flex-shrink: 0;
    }
    .magazine-item .magazine-info {
      flex: 1;
      text-align: left;
      min-width: 0;
    }
    .magazine-item .magazine-info div {
      white-space: normal;
      word-break: break-word;
    }
    .magazine-item .magazine-month {
      font-weight: bold;
      color: #20b7ff;
    }
    .magazine-item .magazine-title {
      font-size: 0.97rem;
      color: #e0eafc;
    }
    .issue-status {
      color: #b0b9c6;
      font-size: 0.9rem;
      text-align: center;
    }
    @media (max-width: 800px) {
      nav {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        width: 100vw;
        background: rgba(30, 34, 44, 0.98);
        flex-direction: column;
        gap: 0;
        z-index: 99;
      }
      nav.open {
        display: flex;
        position: fixed;
        top: 64px;
        left: 0;
        width: 100vw;
      }
      .hamburger {
        display: flex;
      }
      .site-title {
        max-width: 55vw;
        font-size: 1.1rem;
      }
    }
    @media (max-width: 600px) {
      .hero-title { font-size: 1.3rem; }
      section { padding: 1.2rem 0.5rem; }
      .project-announcement {
        align-items: flex-start;
        flex-direction: column;
        gap: 0.8rem;
      }
      .magazine-cover { width: 90px; height: 120px; }
      header { padding: 0 0.7rem; }
      .magazine-list {
        width: 100%;
        padding: 0;
      }
      .magazine-item {
        flex-direction: column;
        align-items: center;
        gap: 0.7rem;
        padding: 1rem 0.7rem;
        width: 98vw;
        max-width: 98vw;
        background: rgba(36,44,60,0.95);
        box-sizing: border-box;
        margin-bottom: 1.2rem;
      }
      .magazine-item img {
        margin-bottom: 0.5rem;
        margin-right: 0;
        display: block;
        margin-left: auto;
        margin-right: auto;
      }
      .magazine-info {
        text-align: center;
        width: 100%;
      }
      .download-btn {
        width: 100%;
        margin-top: 1rem;
        font-size: 1rem;
        padding: 0.8rem 0;
        box-sizing: border-box;
      }
      .magazine-month {
        font-size: 1.05rem;
      }
      .magazine-title {
        font-size: 0.95rem;
      }
    }
    @media (max-width: 400px) {
      .magazine-item {
        max-width: 98vw;
        padding: 0.7rem 0.2rem;
      }
      section {
        padding: 0.7rem 0.1rem;
      }
    }
    /* Animation for sections */
    section {
      opacity: 1;
      transform: translateY(0);
      transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }
    section.visible {
      opacity: 1;
      transform: translateY(0);
    }
     /* Starfield Canvas */
    #starfield {
      position: fixed;
      top: 0; left: 0;
      width: 100vw; height: 100vh;
      z-index: -3;
      pointer-events: none;
    }

:root{
    --btn-size: 64px;
    --pad: 14px;
    --z: 9999;
  }
  /* Smooth scroll (respects reduced motion) */
  html:focus-within { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce){
    html:focus-within { scroll-behavior: auto; }
    .rocket * { animation: none !important; transition: none !important; }
  }

  /* The floating button (no circular background) */
  .back-to-top {
    position: fixed;
    right: 20px;
    bottom: 24px;
    width: var(--btn-size);
    height: calc(var(--btn-size) + 6px);
    z-index: var(--z);
    display: grid;
    place-items: center;
    border: 0;
    padding: var(--pad);
    background: transparent; /* no circle bg */
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: opacity .25s ease, transform .25s ease;
  }
  .back-to-top[data-visible="true"]{
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  .back-to-top:focus-visible{
    outline: 2px solid #7dd3fc;
    outline-offset: 4px;
    border-radius: 14px;
  }

  /* Tooltip */
  .back-to-top::after{
    content: "Back to top";
    position: absolute;
    bottom: calc(100% + 10px);
    right: 0;
    font: 600 12px/1.1 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial;
    background: rgba(0,0,0,.75);
    color: #fff;
    padding: 6px 8px;
    border-radius: 8px;
    transform: translateY(6px);
    opacity: 0;
    white-space: nowrap;
    pointer-events: none;
    transition: opacity .2s ease, transform .2s ease;
  }
  .back-to-top:hover::after { opacity: 1; transform: translateY(0); }

  /* Subtle star trail behind rocket (no backdrop) */
  .trail {
    position: absolute;
    width: 1px; height: 1px;
    top: 70%;
    filter: drop-shadow(0 0 4px rgba(255,255,255,.7));
    animation: sparkle 1.8s linear infinite;
  }
  @keyframes sparkle {
    0%   { opacity: 0; transform: translateY(0) translateX(0) scale(1); }
    10%  { opacity: .9; }
    100% { opacity: 0; transform: translateY(28px) translateX(-6px) scale(.7); }
  }

  /* The rocket is perfectly vertical */
  .rocket {
    width: 36px; /* scales the whole SVG */
    display: block;
  }

  /* Flame flicker + exhaust */
  .flame {
    transform-origin: 50% 0%;
    animation: flameFlicker .12s infinite alternate ease-in-out;
  }
  @keyframes flameFlicker {
    from { transform: scaleY(.9); opacity: .85; }
    to   { transform: scaleY(1.15); opacity: 1; }
  }

  .exhaust {
    opacity: .75;
    animation: exhaustPulse 1s ease-in-out infinite;
  }
  @keyframes exhaustPulse {
    0%,100% { opacity: .3; }
    50%     { opacity: .9; }
  }

  /* Lift on hover */
  .back-to-top:hover .rocket-wrap{
    transform: translateY(-6px);
  }
  .rocket-wrap {
    transition: transform .25s ease;
    position: relative;
  }

  /* Tiny shimmer on body */
  .shine {
    animation: shine 2.4s ease-in-out infinite;
  }
  @keyframes shine {
    0%,100% { opacity: .15; }
    50%     { opacity: .45; }
  }

  /* Optional: adapt for dark themes */
  @media (prefers-color-scheme: dark){
    .back-to-top::after{ background: rgba(255,255,255,.12); color: #e5e7eb; }
  }

/* Collaborators section */
#collaborators .hero {
  text-align: center;
  margin-bottom: 2rem;
}
#collaborators .hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
}
#collaborators .hero-sub {
  margin-top: 0.5rem;
  font-size: 1.1rem;
  color: var(--text);
  opacity: 0.85;
}

#collaborators .controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 2rem;
}
#collaborators {
  max-width: 1000px;
}
#collaborators .controls input,
#collaborators .controls select,
#collaborators .controls button {
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.05);
  color: var(--text);
  font-size: 0.95rem;
}
#collaborators .controls button.chip[aria-pressed="true"] {
  background: var(--accent);
  color: #fff;
}

#collaborators .grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
#collaborators .card {
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  backdrop-filter: blur(6px);
  transition: transform 0.2s;
}
#collaborators .card:hover {
  transform: translateY(-6px);
}
#collaborators .avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 1rem;
  object-fit: cover;
}
#collaborators .name {
  font-weight: 600;
  font-size: 1.1rem;
}
#collaborators .role {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-bottom: 0.6rem;
}
#collaborators .bio {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-bottom: 1rem;
}
#collaborators .socials {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
}
#collaborators .socials a {
  display: inline-flex;
  width: 22px;
  height: 22px;
  fill: var(--accent);
  transition: fill 0.2s;
}
#collaborators .socials a:hover {
  fill: #fff;
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid rgba(32,183,255,.25);
  background: rgba(36,44,60,.5);
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}

.icon:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: rgba(32,183,255,.12);
}

.icon svg {
  width: 18px;   /* control size */
  height: 18px;  /* control size */
  fill: var(--accent);
}
 /* Popup background */
    .popup-overlay {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0, 0, 0, 0.85);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 1000;
      visibility: hidden;
      opacity: 0;
      transition: opacity 0.3s ease, visibility 0.3s ease;
    }

    .popup-overlay.active {
      visibility: visible;
      opacity: 1;
    }

    /* Popup box */
    .popup-box {
      background: #1a1a1a;
      padding: 20px;
      max-width: 420px;
      width: 90%;
      border-radius: 12px;
      text-align: center;
      position: relative;
      box-shadow: 0 6px 20px rgba(0,0,0,0.7);
      animation: popupShow 0.4s ease;
    }

    @keyframes popupShow {
      from { transform: scale(0.8); opacity: 0; }
      to { transform: scale(1); opacity: 1; }
    }

    /* Close button */
    .popup-close {
      position: absolute;
      top: 10px;
      right: 15px;
      font-size: 22px;
      font-weight: bold;
      color: #bbb;
      cursor: pointer;
      transition: color 0.2s;
    }

    .popup-close:hover {
      color: #3399ff;
    }

    /* Title with blinking blue glow */
    .popup-box h2 {
      margin-top: 10px;
      font-size: 1.6rem;
      color: #ffffff;
      animation: blinkGlow 1.5s infinite alternate;
    }

    @keyframes blinkGlow {
      0% { color: #3399ff; text-shadow: 0 0 5px #3399ff, 0 0 10px #0066cc; }
      50% { color: #ffffff; text-shadow: none; }
      100% { color: #3399ff; text-shadow: 0 0 10px #3399ff, 0 0 20px #0066cc; }
    }

    .popup-box p {
      margin: 15px 0;
      font-size: 1rem;
      color: #cccccc;
    }

    /* Button (blue theme with pulse effect) */
    .popup-box a {
      display: inline-block;
      margin-top: 10px;
      padding: 10px 18px;
      background: #3399ff;
      color: white;
      border-radius: 6px;
      text-decoration: none;
      font-weight: bold;
      transition: background 0.3s;
      animation: pulseButton 2s infinite;
    }

    .popup-box a:hover {
      background: #0066cc;
    }

    @keyframes pulseButton {
      0% { box-shadow: 0 0 5px #3399ff, 0 0 10px #0066cc; }
      50% { box-shadow: 0 0 15px #3399ff, 0 0 25px #0066cc; }
      100% { box-shadow: 0 0 5px #3399ff, 0 0 10px #0066cc; }
    }