:root {
  --bg: #f4f2ea;
  --surface: #ffffff;
  --surface-soft: #f6f2e9;
  --text: #1f2a26;
  --muted: #5f6a5b;
  --accent: #5a7d54;
  --accent-dark: #3f593f;
  --border: #d8d0c4;
  --shadow: 0 20px 45px rgba(20, 22, 19, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

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

button,
input,
textarea {
  font: inherit;
}

.hero-large {
  position: relative;
  min-height: 70vh;
  color: #fff;
  background: linear-gradient(180deg, rgba(22, 41, 32, 0.6), rgba(22, 41, 32, 0.2)), url("https://nt.global.ssl.fastly.net/binaries/content/gallery/website/national/library/discover-and-learn/nature/fauna/1624188-puffins-farne-islands.jpg?auto=webp&width=1440&crop=16:7&dpr=2") center / cover no-repeat;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(22, 41, 32, 0.3), rgba(22, 41, 32, 0.65));
}

.hero-content {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 6rem 2rem 4rem;
}

.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.85rem;
  color: #d8d0c4;
  margin-bottom: 1rem;
}

.hero-content h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.75rem, 4vw, 4.75rem);
  line-height: 1.02;
  max-width: 12ch;
}

.hero-content p {
  max-width: 34rem;
  line-height: 1.8;
  margin: 0 0 1.8rem;
  color: #f1efe6;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 1.6rem;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
  text-decoration: none;
}

.button:hover {
  transform: translateY(-1px);
  background: var(--accent-dark);
}

.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

.section-muted {
  background: #fff;
  border-radius: 1.75rem;
  margin-top: -5rem;
  box-shadow: var(--shadow);
}

.section-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.feature-card {
  padding: 2rem;
  border-radius: 1.25rem;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.feature-card h2 {
  margin-top: 1rem;
  margin-bottom: 0.75rem;
}

.feature-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.content-block {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
}

.content-image {
  border-radius: 1.75rem;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.content-copy h2 {
  margin-top: 0;
}

.content-copy p,
.content-copy ul {
  line-height: 1.9;
  color: var(--muted);
}

.content-copy ul {
  padding-left: 1.1rem;
  margin: 1.25rem 0 0;
}

.content-copy li {
  margin-bottom: 0.8rem;
}

.secret-panel {
  background: #fff;
  border-radius: 1.75rem;
  box-shadow: var(--shadow);
  padding: 2rem;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.unlock-row {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr auto;
  margin-top: 1rem;
}

input[type="email"],
input[type="password"],
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem 1.1rem;
  background: #fff;
  color: var(--text);
}

textarea {
  min-height: 180px;
  resize: vertical;
}

.feedback {
  color: #9b2c2c;
  margin-top: 0.8rem;
  min-height: 1.4rem;
}

.messages-panel {
  margin-top: 2rem;
}

.messages-panel h3 {
  margin-bottom: 1rem;
}

.messages-list {
  display: grid;
  gap: 1rem;
}

.image-input-row {
  display: grid;
  gap: 0.75rem;
  margin: 1rem 0 1.25rem;
}

.file-upload {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--surface);
  cursor: pointer;
}

.file-upload input {
  display: none;
}

.image-preview {
  color: var(--muted);
  font-size: 0.95rem;
}

.message-image-wrapper {
  margin-top: 1rem;
  display: grid;
  gap: 0.75rem;
}

.message-image {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
  border-radius: 1rem;
  cursor: zoom-in;
  border: 1px solid var(--border);
}

.button-small {
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
}

.image-modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 1000;
}

.image-modal.hidden {
  display: none;
}

.image-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.75);
}

.image-modal__content {
  position: relative;
  z-index: 1;
  max-width: 92vw;
  max-height: 92vh;
  width: min(960px, 100%);
  padding: 1rem;
  background: rgba(255, 255, 255, 0.96);
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  overflow: auto; /* allow scrolling when image is taller than viewport */
}

.image-modal__content img {
  max-width: 100%;
  max-height: calc(92vh - 120px); /* leave room for padding, caption and close button */
  width: auto;
  height: auto;
  border-radius: 1rem;
  object-fit: contain;
}

.image-modal__image-wrapper {
  width: 100%;
  max-height: calc(92vh - 120px);
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-overflow-scrolling: touch;
}

.image-modal {
  overscroll-behavior: contain; /* keep scroll inside modal */
}

/* prevent background scrolling when modal open */
body.no-scroll {
  overflow: hidden;
}

.image-modal__close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 1.75rem;
  cursor: pointer;
}

.image-modal__caption {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.message-card {
  padding: 1.35rem 1.25rem;
  border-radius: 1.25rem;
  background: var(--surface-soft);
  border: 1px solid var(--border);
}

.message-meta {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.message-content {
  white-space: pre-wrap;
  line-height: 1.7;
}

.footer-simple {
  padding: 3rem 2rem 4rem;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 960px) {
  .content-block,
  .section-grid {
    grid-template-columns: 1fr;
  }
  .hero-content {
    padding: 4rem 1.5rem 3rem;
  }
  .unlock-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .hero-content h1 {
    font-size: 2.6rem;
  }
  .section {
    padding: 2rem 1.25rem;
  }
}

/* utility to hide secret content until unlocked */
.hidden {
  display: none !important;
}

.logins-page {
  min-height: 100vh;
  padding: 3rem 1.25rem;
  background: var(--bg);
}

.logins-panel {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
}

.logins-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.logins-header h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
}

.logins-auth {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: center;
}

.table-wrap {
  width: 100%;
  margin-top: 1.5rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: #fff;
}

.logins-table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
}

.logins-table th,
.logins-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.logins-table th {
  background: var(--surface-soft);
  color: var(--text);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.logins-table td {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.logins-table tr:last-child td {
  border-bottom: 0;
}

.logins-table td:nth-child(3),
.logins-table td:nth-child(4) {
  max-width: 320px;
  word-break: break-word;
}

@media (max-width: 720px) {
  .logins-page {
    padding: 1rem;
  }

  .logins-panel {
    padding: 1.25rem;
  }

  .logins-header,
  .logins-auth {
    grid-template-columns: 1fr;
  }

  .logins-header {
    display: grid;
  }
}