/* Global reset & box sizing */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* NASA Color Palette */
:root {
  --nasa-blue: #0b3d91;
  --nasa-red: #fc3d21;
  --nasa-dark: #212121;
  --nasa-light-gray: #f1f1f1;
  --nasa-mid-gray: #e5e5e5;
  --nasa-white: #fff;
  --nasa-shadow: rgba(11, 61, 145, 0.08);
}

/* Base page styles */
body {
  font-family: Arial, sans-serif;
  background-color: var(--nasa-light-gray);
  padding: 20px;
  color: var(--nasa-dark);
}

/* Centered container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--nasa-white);
  border-radius: 12px;
  box-shadow: 0 4px 24px var(--nasa-shadow);
  padding-bottom: 30px;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 28px;
  padding-bottom: 24px;
  margin-bottom: 24px;
  background: var(--nasa-blue);
  border-radius: 12px 12px 0 0;
  box-shadow: 0 2px 8px var(--nasa-shadow);
}

h1 {
  font-family: 'Verdana', Arial, sans-serif;
  font-weight: bold;
  color: var(--nasa-white);
  letter-spacing: 2px;
  font-size: 2.2em;
  text-shadow: 0 2px 8px rgba(11,61,145,0.12);
}

/* Logo */
.logo {
  width: 140px;
  margin-right: 18px;
  filter: drop-shadow(0 2px 4px var(--nasa-shadow));
}

/* Date‐picker & button row */
.filters {
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: center;
  margin-bottom: 24px;
  padding: 0 20px;
}

/* Inputs and buttons */
input[type="date"],
button {
  font-family: Arial, sans-serif;
  font-weight: normal;
  color: var(--nasa-dark);
  padding: 10px 15px;
  border: 1.5px solid var(--nasa-mid-gray);
  border-radius: 4px;
  font-size: 16px;
  line-height: 1.4;
  width: 100%;
  background: var(--nasa-white);
  transition: border 0.2s, box-shadow 0.2s;
}

input[type="date"]:focus {
  border: 1.5px solid var(--nasa-blue);
  outline: none;
  box-shadow: 0 0 0 2px #b3c6e7;
}

/* Button specific */
button {
  background-color: var(--nasa-red);
  color: var(--nasa-white);
  font-weight: bold;
  letter-spacing: 1px;
  border: none;
  box-shadow: 0 2px 8px var(--nasa-shadow);
  transition: background 0.2s, color 0.2s;
}
button:hover {
  background-color: var(--nasa-blue);
  color: var(--nasa-white);
}

/* Stack horizontally on wider screens */
@media (min-width: 600px) {
  .filters {
    flex-direction: row;
    padding: 0;
  }
  input[type="date"],
  button {
    width: auto;
  }
}

/* Gallery flex container */
.gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding: 24px;
  justify-content: center;
  background: var(--nasa-light-gray);
  border-radius: 0 0 12px 12px;
}

/* Gallery items */
.gallery-item {
  flex: 1 1 100%;
  min-width: 280px;
  max-width: 500px;
  background: var(--nasa-white);
  padding: 14px;
  border-radius: 10px;
  box-shadow: 0 2px 8px var(--nasa-shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 2px solid var(--nasa-mid-gray);
  transition: border 0.2s, box-shadow 0.2s;
}
.gallery-item:hover {
  border: 2px solid var(--nasa-blue);
  box-shadow: 0 4px 16px var(--nasa-shadow);
}

@media (min-width: 1000px) {
  .gallery-item {
    flex: 0 1 31%;
  }
}

.gallery-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 6px;
  border: 1.5px solid var(--nasa-mid-gray);
  background: var(--nasa-light-gray);
  transition: transform 0.3s cubic-bezier(.4,2,.6,1), box-shadow 0.2s;
  cursor: pointer;
}
.gallery-item img:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 24px var(--nasa-shadow);
  z-index: 2;
}

.gallery-item h3 {
  color: var(--nasa-blue);
  font-size: 1.2em;
  margin-top: 10px;
  margin-bottom: 4px;
  font-weight: bold;
  letter-spacing: 1px;
}

.gallery-item p {
  margin-top: 6px;
  padding: 5px;
  font-size: 14px;
  color: var(--nasa-dark);
}

/* Placeholder content */
.placeholder {
  flex: 1 1 100%;
  text-align: center;
  padding: 40px;
  color: var(--nasa-blue);
  background: var(--nasa-light-gray);
  border-radius: 8px;
  border: 2px dashed var(--nasa-mid-gray);
}

.placeholder-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

/* Modal styles */
#imageModal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0; top: 0; right: 0; bottom: 0;
  width: 100vw; height: 100vh;
  background: rgba(11,61,145,0.85);
  align-items: center;
  justify-content: center;
}

#imageModal[style*="display: flex"] {
  display: flex !important;
}

.modal-content {
  background: var(--nasa-white);
  border-radius: 12px;
  max-width: 600px;
  width: 90%;
  padding: 28px 24px 24px 24px;
  box-shadow: 0 4px 24px var(--nasa-shadow);
  position: relative;
  text-align: center;
  animation: fadeIn 0.2s;
  border: 3px solid var(--nasa-blue);
}

@keyframes fadeIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-img {
  width: 100%;
  max-height: 350px;
  object-fit: contain;
  border-radius: 8px;
  margin-bottom: 18px;
  border: 2px solid var(--nasa-mid-gray);
  background: var(--nasa-light-gray);
}

.modal-title {
  font-size: 1.4em;
  margin-bottom: 8px;
  color: var(--nasa-blue);
  font-weight: bold;
  letter-spacing: 1px;
}

.modal-date {
  font-size: 1em;
  color: var(--nasa-red);
  margin-bottom: 12px;
  font-weight: bold;
}

.modal-explanation {
  font-size: 1em;
  color: var(--nasa-dark);
  margin-top: 10px;
  text-align: left;
  background: var(--nasa-light-gray);
  border-radius: 6px;
  padding: 10px;
}

.modal-close {
  position: absolute;
  top: 10px; right: 18px;
  font-size: 2em;
  color: var(--nasa-red);
  cursor: pointer;
  font-weight: bold;
  transition: color 0.2s;
  user-select: none;
}

.modal-close:hover {
  color: var(--nasa-blue);
}

/* Space Fact Section */
.space-fact {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--nasa-blue);
  color: var(--nasa-white);
  font-size: 1.1em;
  font-weight: bold;
  padding: 16px 0 12px 0;
  margin-bottom: 0;
  border-radius: 0 0 12px 12px;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px var(--nasa-shadow);
}
.fact-icon {
  font-size: 1.5em;
  margin-right: 10px;
}

/* Video entry styles */
.video-thumb {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.video-icon {
  font-size: 2em;
  color: var(--nasa-red);
}
.video-link {
  color: var(--nasa-blue);
  font-weight: bold;
  text-decoration: underline;
  font-size: 1.1em;
  transition: color 0.2s;
}
.video-link:hover {
  color: var(--nasa-red);
}