/* ===== Global Base Styles ===== */
html {
    box-sizing: border-box;
    font-size: 16px;
    line-height: 1.5;
    scroll-behavior: smooth;
  }
  
  *, *::before, *::after {
    box-sizing: inherit;
  }
  
  body {
    margin: 0;
    padding: 0;
    font-family: system-ui, sans-serif;
    background-color: #f0f2f4;
    color: #212529;
  }
  
  /* ===== Layout ===== */
  
  
  header {
    background-color: #ffffff;
    border-bottom: 1px solid #ddd;
  }

  
  .centered-wrapper {
    max-width: 1050px;
    margin: 0 auto;
    padding-left: 0;
    padding-right: 0;
  }
  
  
  
  header h1 {
    margin: 0;
    font-size: 1.5rem;
    flex-grow: 1;
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
  }


header h1 a {
    color: inherit;
    text-decoration: none;
  }
  
  header h1 a:hover,
  header h1 a:focus {
    text-decoration: underline;
  }
  
  nav {
    display: flex;
    gap: 1rem;
  }
  
  nav a {
    color: #0077cc;
    text-decoration: none;
    font-weight: 500;
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
    transition: background-color 0.2s ease;
  }
  
  nav a:hover,
  nav a:focus {
    background-color: #eef6fc;
    text-decoration: none;
    outline: none;
  }
  
  
  main.centered-wrapper {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    padding: 2rem 1rem;    /* inner breathing room */
    margin-top: 1rem;      /* tuck up under header border */
  }
  
  
  .intro-section {
    margin-top: 0;
    padding-top: 0;
    padding-bottom: 0;
    padding-left: 3rem;
    padding-right: 3rem;
    margin-bottom: 0;
  }
  
  .intro {
    font-size: 1rem;
    margin: 0 0 1.5rem 0;
    text-align: left;
  }

  .camera-icon {
    font-size: 2em;
    margin-bottom: 0.5em;
  }

  .camera-icon span {
    font-size: 0.7em;
  }



  .main-intro {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-areas:
      "icon"
      "p1"
      "weather"
      "p2";
    gap: 0rem;
  }
  
  .main-intro .camera-icon {
    grid-area: icon;
  }
  
  .main-intro .intro:nth-of-type(1) {
    grid-area: p1;
  }
  
  .main-intro .weathercloud {
    grid-area: weather;
    justify-self: center;
    width: 90px;
    height: 90px;
    background: #f7fbff;
    border: 1px solid #c7e0f5;
    border-radius: 8px;
    padding: 1rem;
    margin: 0 0 1rem 1.5rem;
    text-align: center;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  }
  
  .main-intro .intro:nth-of-type(2) {
    grid-area: p2;
  }
  
  .main-intro .weathercloud a {
    text-decoration: none;
    color: #0077cc;
    font-weight: 600;
    font-size: 0.8em;
  }
  
  .main-intro .weathercloud-icon {
    font-size: 1.6em;
    display: block;
    margin-bottom: 0.25em;
  }
  
  

  .cta-button {
    display: inline-block;
    padding: 0.25rem 0.7rem;
    background: #ceeaff;
    color: rgb(39, 39, 39);
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    margin-left: 0.5rem;
    margin-right: 0.5rem;
    margin-top: 0rem;
    margin-bottom: 1.5rem;
    min-width: 0px;
  }
  .cta-button:hover,
  .cta-button:focus {
    background: #005fa3;
  }

  @media (min-width: 900px) {
    .main-intro {
      grid-template-columns: 1fr 140px;
      grid-template-areas:
        "icon      weather"
        "p1        weather"
        "p2        weather";
      align-items: start;
    }
  
    .main-intro .weathercloud {
      justify-self: end;
    }

    .cta-button {
        min-width: 290px;
      }
  }
  
  
 

  
  #day-selector {
    text-align: center;
    margin: 2rem auto;
  }
  
  #day-selector button {
    font-size: 1.25rem;
    padding: 0.25rem 0.75rem;
    margin: 0 1rem;
    background: #ffffff;
    border: 1px solid #ccc;
    border-radius: 4px;
    cursor: pointer;
  }
  
  #day-selector span {
    font-weight: bold;
    font-size: 1rem;
  }
  
  h2 {
    font-size: 1.25rem;
    margin-top: 1.5rem;
  }
  
  /* ===== Snapshot Grid ===== */
  #snapshot-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    position: relative; /* allow overlay banner positioning */
  }
  
  .tile {
    flex: 1 1 220px;
    max-width: 220px;
    text-align: center;
  }
  
  .tile img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    display: block;
    margin: 0 auto;
    cursor: pointer;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    transition: filter 0.2s ease, opacity 0.2s ease;
  }
  
  .tile img:focus {
    outline: 3px solid #0077cc;
    outline-offset: 4px;
  }
  
  /* ===== Responsive Adjustments ===== */
  @media (max-width: 1000px) {
    .tile {
      flex: 1 1 30%;
    }
    header h1 { 
        padding-left: 1rem;
    }
  }
  
  @media (max-width: 700px) {
    .tile {
      flex: 1 1 45%;
    }
    header h1 { 
        padding-left: 1rem;
    }
  }
  
  @media (max-width: 480px) {
    .tile {
        flex: 1 1 100%;
        max-width: 120px;
        margin-left: auto;
        margin-right: auto;
      }
    
      .tile img {
        width: 100%;
        max-width: 100%;
        height: auto;
      }
    header h1 { 
        padding-left: 1rem;
    }
  }
  
  /* ===== Period Sections ===== */
  section h2 {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
  }
  
  .period-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1em;
    justify-content: center;
  }
  
  /* ===== Lightbox Modal ===== */
  #lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.85);
    justify-content: center;
    align-items: center;
    z-index: 1000;
  }
  
  #lightbox[aria-hidden="false"] {
    display: flex;
  }
  
  #lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: 4px;
  }
  
  #lightbox-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 2rem;
    color: white;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
  }
  
  #lightbox-close:focus {
    outline: 3px solid #ffffff;
    outline-offset: 4px;
  }
  
  /* ===== Stale Images Indicator ===== */
  #snapshot-grid.stale .tile img {
    filter: grayscale(1);
    opacity: 0.55;
  }

  #stale-banner {
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px; /* stretch across the row */
    z-index: 10;
    background: rgba(255, 193, 7, 0.95); /* amber */
    color: #1f1400;
    border: 1px solid rgba(0,0,0,0.1);
    box-shadow: 0 2px 6px rgba(0,0,0,0.12);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-weight: 700;
    text-align: center;
    pointer-events: none; /* don't block clicks on images */
  }

  #stale-banner .details {
    font-weight: 500;
  }