:root {
  --bg: #f7f9f7;
  --surface: #ffffff;
  --green: #2f6d4a;
  --green-soft: #d9eadf;
  --red: #7a2f2f;
  --text: #1f2a24;
  --muted: #4c5a52;
  --accent: #c9d7cf;
  --shadow: 0 10px 30px rgba(31, 42, 36, 0.12);
  --radius: 18px;
}

* { box-sizing: border-box; }

body.admin {
  margin: 0;
  font-family: "Source Sans 3", system-ui, sans-serif;
  background: radial-gradient(circle at top, #ffffff 0%, #f2f7f3 40%, #eef3ef 100%);
  color: var(--text);
  min-height: 100vh;
}

.admin-header {
  padding: 28px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--accent);
}

.admin-header strong {
  font-family: "Merriweather", serif;
  font-size: 1.1rem;
}

.admin-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.admin-nav a {
  text-decoration: none;
  color: var(--green);
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: #ffffff;
  font-weight: 600;
}

.admin-nav a.active {
  background: var(--green-soft);
  border-color: #b8d2c3;
}

.admin-nav .logout {
  color: var(--red);
  border-color: #e2bcbc;
}

.admin-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px 60px;
  display: grid;
  gap: 20px;
}

.admin-main.admin-stack {
  grid-template-columns: 1fr;
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  box-shadow: var(--shadow);
  padding: 24px;
}

.login-card {
  max-width: 420px;
  margin: 30px auto 0;
}

.login-card h1,
.form-card h1 {
  margin-top: 0;
  font-family: "Merriweather", serif;
}

.helper {
  color: var(--muted);
  margin-top: 0;
}

label {
  display: grid;
  gap: 8px;
  font-weight: 600;
  margin-bottom: 16px;
}

input, select {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--accent);
  font-size: 0.95rem;
  font-family: inherit;
}

input:focus, select:focus {
  outline: 2px solid #b8d2c3;
  border-color: #b8d2c3;
}

.file-field input[type="file"] {
  padding: 10px;
  border-style: dashed;
  background: #f6faf7;
}

.file-name {
  font-size: 0.85rem;
  color: var(--muted);
}

.btn {
  background: var(--green);
  color: #ffffff;
  border: none;
  padding: 12px 18px;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
}

.btn:hover {
  filter: brightness(0.95);
}

.btn-outline {
  background: #ffffff;
  color: var(--green);
  border: 1px solid var(--accent);
  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  font-size: 0.9rem;
}

.btn-danger {
  background: #7a2f2f;
  color: #ffffff;
  border: none;
  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.9rem;
}

.btn-danger:hover,
.btn-outline:hover {
  filter: brightness(0.95);
}

.inline-form {
  margin: 0;
}

.flash {
  padding: 10px 12px;
  border-radius: 12px;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.flash.error {
  background: #f7dede;
  color: #7a2f2f;
  border: 1px solid #e2bcbc;
}

.flash.success {
  background: #e3f1e8;
  color: #2f6d4a;
  border: 1px solid #c6e0cf;
}

.info-card h2 {
  margin-top: 0;
  font-family: "Merriweather", serif;
}

.preview {
  margin-top: 16px;
  padding: 12px;
  border-radius: 12px;
  background: #f6faf7;
  border: 1px solid #d7e6db;
}

.preview h3 {
  margin: 0 0 6px;
}

.preview-text {
  margin: 0;
  color: var(--muted);
}

.tips {
  margin: 18px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.manage-list {
  display: grid;
  gap: 16px;
  margin-top: 12px;
}

.file-manage {
  border-radius: 16px;
  border: 1px solid var(--accent);
  background: #ffffff;
  overflow: hidden;
}

.file-manage summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  background: #f8fbf8;
}

.file-manage summary::-webkit-details-marker {
  display: none;
}

.file-manage-main {
  display: grid;
  gap: 4px;
}

.file-manage-title {
  font-weight: 700;
}

.file-manage-meta {
  font-size: 0.85rem;
  color: var(--muted);
}

.file-manage-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.file-manage-body {
  padding: 16px 18px 20px;
  background: #fdfefd;
  border-top: 1px solid #e6ece7;
}

.manage-form {
  display: grid;
  gap: 12px;
}

.user-grid {
  display: grid;
  gap: 16px;
  margin-top: 12px;
}

.user-card {
  padding: 16px 18px;
  border-radius: 14px;
  border: 1px solid var(--accent);
  background: #ffffff;
}

.user-card h2 {
  margin-top: 0;
  font-family: "Merriweather", serif;
}

.user-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid #e6ece7;
}

.user-row:last-child {
  border-bottom: none;
}

.user-meta {
  color: var(--muted);
  font-size: 0.85rem;
}

.user-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

@media (min-width: 900px) {
  .admin-main {
    grid-template-columns: minmax(380px, 1.3fr) minmax(260px, 0.7fr);
  }
}

@media (max-width: 900px) {
  .file-manage summary {
    grid-template-columns: 1fr;
  }
}