:root {
  --bg: #faf6f2;
  --card: #ffffff;
  --text: #2e2a27;
  --muted: #8a7f77;
  --accent: #b98a6b;
  --accent-dark: #8f6a4f;
  --error: #b3413e;
  --border: #e7ddd4;
}

* {
  box-sizing: border-box;
}

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

body.centered {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  max-width: 380px;
  width: 100%;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.card h1 {
  margin-top: 0;
}

.subtitle {
  color: var(--muted);
  margin-bottom: 1.5rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  text-align: left;
}

label {
  font-size: 0.9rem;
  font-weight: 600;
}

input[type="text"],
input[type="password"],
input[type="file"] {
  padding: 0.6rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}

button {
  margin-top: 0.5rem;
  padding: 0.7rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
}

button:hover {
  background: var(--accent-dark);
}

.error {
  color: var(--error);
  font-weight: 600;
}

.hint {
  color: var(--muted);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.brand {
  font-weight: 700;
  text-decoration: none;
  color: var(--text);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-links a {
  color: var(--accent-dark);
  text-decoration: none;
  font-weight: 600;
}

.guest-name {
  color: var(--muted);
}

.logout-form button {
  margin: 0;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1.5rem;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.75rem;
}

.gallery-item {
  position: relative;
  display: block;
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 1 / 1;
  background: #eee;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.gallery-item .uploader {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 0.75rem;
  padding: 0.25rem 0.4rem;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 0.5rem;
  margin: 0.5rem 0;
}

.preview-grid img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 6px;
}