:root {
  color-scheme: light;
  --bg: #edf5f5;
  --card: #ffffff;
  --text: #0e1f24;
  --muted: #5a6a6f;
  --accent: #137f7f;
  --accent-weak: #dff1f0;
  --border: #e3ecec;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Avenir", "Trebuchet MS", sans-serif;
  background: radial-gradient(circle at top left, #cfe9e7 0%, #edf5f5 45%, #f8fbfb 100%);
  color: var(--text);
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.brand {
  display: flex;
  gap: 16px;
  align-items: center;
}

.logo {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  background: linear-gradient(135deg, #0b8f8f, #0f5c5c);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 18px;
}

.admin-key {
  display: flex;
  gap: 8px;
  align-items: center;
}

.admin-key input {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.admin-key button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 14px;
  border-radius: 10px;
  cursor: pointer;
}

.nav {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.nav-btn {
  border: 1px solid var(--border);
  background: var(--card);
  padding: 10px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
}

.nav-link {
  border: 1px solid var(--border);
  background: transparent;
  padding: 10px 18px;
  border-radius: 999px;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}

.nav-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.content {
  display: grid;
  gap: 18px;
}

.card {
  background: var(--card);
  border-radius: 20px;
  padding: 20px;
  box-shadow: 0 12px 30px rgba(10, 30, 30, 0.08);
}

.section {
  display: none;
}

.section.active {
  display: block;
}

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

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.stat {
  background: var(--accent-weak);
  border-radius: 16px;
  padding: 14px;
}

.stat .label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat .value {
  font-size: 24px;
  font-weight: 700;
}

.upload,
.search,
.feedback-form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.login-card {
  margin-top: 12px;
  padding: 14px;
  border-radius: 16px;
  background: var(--accent-weak);
}

.login-fields {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 10px 0;
}

.qr-block {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 12px;
}

.qr-block img {
  width: 160px;
  height: 160px;
  background: white;
  padding: 8px;
  border-radius: 16px;
  border: 1px solid var(--border);
}

.qr-meta {
  display: grid;
  gap: 8px;
}

.secondary {
  background: #e8f2f2;
  color: var(--text);
  border: 1px solid var(--border);
}

input,
textarea {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 14px;
}

textarea {
  min-height: 120px;
  width: 100%;
}

button {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 10px 16px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
}

.table {
  display: grid;
  gap: 8px;
}

.row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 12px;
  background: #f7fbfb;
}

.row.header {
  background: var(--accent-weak);
  font-weight: 600;
}

.list {
  display: grid;
  gap: 12px;
}

.list-item {
  border-radius: 14px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  background: #fbfefe;
}

.list-item h4 {
  margin: 0 0 6px 0;
}

.actions button {
  background: #e8f2f2;
  color: var(--text);
  border: 1px solid var(--border);
}

@media (max-width: 720px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .row {
    grid-template-columns: 1fr;
  }
}