:root {
  --bg: #e8f1fc;
  --bg-2: #d7e7fb;
  --card: #ffffff;
  --blue-100: #eaf3ff;
  --blue-200: #cfe3fb;
  --blue-300: #a9cdf6;
  --blue-500: #6aa8ee;
  --blue-600: #4a8fdd;
  --text: #1f3350;
  --muted: #6b86a6;
  --mint: #c3f2dc;
  --mint-text: #1f7a52;
  --slate: #e4ebf3;
  --slate-text: #62748c;
  --shadow: 0 14px 34px rgba(106, 168, 238, 0.22);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: linear-gradient(160deg, var(--bg) 0%, var(--bg-2) 100%);
  color: var(--text);
  font-family: "Segoe UI", "Inter", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 72px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.card {
  background: var(--card);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(169, 205, 246, 0.35);
}

/* --------------------------- hero / status --------------------------- */

.hero {
  text-align: center;
}

h1 {
  margin: 0;
  font-size: 2.4rem;
  letter-spacing: -0.02em;
  color: var(--blue-600);
  font-weight: 700;
}

.subtitle {
  margin: 6px 0 26px;
  color: var(--muted);
  font-size: 0.95rem;
}

.indicators {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 20px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.98rem;
  font-weight: 600;
  background: var(--slate);
  color: var(--slate-text);
  transition: background 0.3s ease, color 0.3s ease;
}

.badge .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.85;
}

.badge--present {
  background: var(--mint);
  color: var(--mint-text);
}

.badge--present .dot {
  animation: pulse 1.6s ease-in-out infinite;
}

.badge--absent {
  background: var(--slate);
  color: var(--slate-text);
}

.badge--online {
  background: var(--blue-100);
  color: var(--blue-600);
}

.badge--offline {
  background: var(--slate);
  color: var(--slate-text);
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; transform: scale(0.9); }
  50%      { opacity: 1;   transform: scale(1.2); }
}

.last-seen {
  margin: 0 0 26px;
  color: var(--muted);
  font-size: 0.92rem;
}

.last-seen span {
  color: var(--text);
  font-weight: 600;
}

/* ------------------------------- button ------------------------------ */

.snap-btn {
  appearance: none;
  border: none;
  cursor: pointer;
  padding: 16px 42px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--blue-500), var(--blue-600));
  box-shadow: 0 10px 22px rgba(74, 143, 221, 0.35);
  transition: transform 0.12s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.snap-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 14px 26px rgba(74, 143, 221, 0.45);
}

.snap-btn:active:not(:disabled) {
  transform: translateY(0);
}

.snap-btn:disabled {
  opacity: 0.55;
  cursor: default;
  box-shadow: none;
}

.snap-status {
  min-height: 20px;
  margin: 16px 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ------------------------------ gallery ------------------------------ */

.gallery-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 18px;
}

h2 {
  margin: 0;
  font-size: 1.25rem;
  color: var(--text);
}

.gallery-count {
  font-size: 0.85rem;
  color: var(--muted);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 14px;
}

.tile {
  margin: 0;
  border-radius: 16px;
  overflow: hidden;
  background: var(--blue-100);
  border: 1px solid rgba(169, 205, 246, 0.5);
}

.tile img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.tile figcaption {
  padding: 8px 12px;
  font-size: 0.78rem;
  color: var(--muted);
  background: #ffffff;
}

.gallery-empty {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 480px) {
  .card { padding: 24px 20px; }
  h1 { font-size: 1.9rem; }
}