:root {
  --bg: #f4f6f8;
  --surface: #fff;
  --text: #1a1f2c;
  --muted: #5c6578;
  --border: #d8dee8;
  --primary: #14586f;
  --primary-hover: #0f4558;
  --danger: #b42318;
  --success: #067647;
  --info: #175cd3;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --sidebar-width: 250px;
  --topbar-height: 64px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: min(1100px, 100% - 2rem); margin-inline: auto; }

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
}
.logo {
  display: flex;
  align-items: center;
  font-weight: 700;
  color: var(--text);
  font-size: 1.1rem;
}
.logo:hover { text-decoration: none; }
.logo-img {
  display: block;
  height: 40px;
  width: auto;
}

.user-box { display: flex; align-items: center; gap: 0.75rem; margin-left: auto; }
.user-name { font-size: 0.9rem; color: var(--muted); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: var(--topbar-height);
  padding: 0.5rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.sidebar-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
  color: var(--text);
  flex-shrink: 0;
}
.sidebar-toggle:hover { background: var(--bg); }
.sidebar-toggle-bars,
.sidebar-toggle-bars::before,
.sidebar-toggle-bars::after {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  position: relative;
}
.sidebar-toggle-bars::before,
.sidebar-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
}
.sidebar-toggle-bars::before { top: -6px; }
.sidebar-toggle-bars::after { top: 6px; }

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  width: var(--sidebar-width);
  height: 100vh;
  overflow-y: auto;
  background: #14586f;
  color: #e8f4f7;
  border-right: 1px solid #0f4558;
  padding: 1.25rem 0 1.5rem;
  display: flex;
  flex-direction: column;
}
.sidebar .sidebar-nav { display: flex; flex-direction: column; gap: 1.25rem; }
.sidebar-section { display: flex; flex-direction: column; gap: 0.15rem; padding: 0 0.75rem; }
.sidebar-heading {
  margin: 0 0 0.35rem;
  padding: 0 0.65rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #a8c5ce;
}
.sidebar-nav a {
  display: block;
  color: #d4e8ee;
  padding: 0.55rem 0.65rem;
  border-radius: 6px;
  font-size: 0.95rem;
}
.sidebar-nav a:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  text-decoration: none;
}
.sidebar-nav a.active {
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
  font-weight: 600;
}

.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 45;
  background: rgba(16, 24, 40, 0.45);
}

.site-main { flex: 1; padding: 1.75rem 0 2.5rem; }
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.85rem;
  padding: 1rem 0;
}

h1 { margin-top: 0; font-size: 1.6rem; }
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.page-head h1 { margin: 0; }
.muted { color: var(--muted); font-size: 0.9rem; }
.mt { margin-top: 1rem; }
code { background: #eef2f7; padding: 0.1em 0.35em; border-radius: 4px; font-size: 0.9em; }

.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  background: var(--surface);
}
.alert-success { border-color: #abefc6; background: #ecfdf3; color: var(--success); }
.alert-error { border-color: #fecdca; background: #fef3f2; color: var(--danger); }
.alert-info { border-color: #b2ccff; background: #eff4ff; color: var(--info); }

.btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font: inherit;
  cursor: pointer;
  background: var(--border);
  color: var(--text);
  text-decoration: none;
}
.btn:hover { text-decoration: none; filter: brightness(0.97); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: transparent; border-color: var(--border); }
.btn-small { padding: 0.3rem 0.65rem; font-size: 0.85rem; }

.form label { display: block; margin-bottom: 0.9rem; font-weight: 500; }
.form input[type="text"],
.form input[type="email"],
.form input[type="password"],
.form input[type="number"],
.form select,
.form textarea {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  background: #fff;
}
.form textarea { resize: vertical; }
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0 1rem;
}
.form-grid .full { grid-column: 1 / -1; }
fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  margin: 0 0 1rem;
  background: var(--surface);
}
legend { padding: 0 0.35rem; font-weight: 600; }
.checkbox { font-weight: 400; display: flex; align-items: flex-start; gap: 0.5rem; }
.checkbox input { margin-top: 0.25rem; }

.auth-card {
  max-width: 420px;
  margin: 2rem auto;
  background: var(--surface);
  padding: 1.75rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.table th, .table td { padding: 0.7rem 0.85rem; text-align: left; border-bottom: 1px solid var(--border); }
.table th { background: #f8fafc; font-weight: 600; color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.02em; }
.table tr:last-child td { border-bottom: none; }
.actions { white-space: nowrap; }
.actions a, .actions button { margin-right: 0.5rem; }
.link-danger {
  background: none; border: none; color: var(--danger); cursor: pointer; font: inherit; padding: 0;
  text-decoration: underline;
}
.inline { display: inline; }
.actions-row { display: flex; gap: 0.75rem; align-items: center; margin-top: 0.5rem; }

@media (min-width: 900px) {
  body.app-shell {
    padding-left: var(--sidebar-width);
  }
  .app-shell .sidebar {
    padding-top: 1.25rem;
  }
  .sidebar-backdrop { display: none !important; }
}

@media (max-width: 899px) {
  .sidebar-toggle { display: inline-flex; }
  .app-shell .topbar { z-index: 55; }
  .app-shell .sidebar {
    top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: none;
  }
  .app-shell .sidebar-backdrop {
    top: var(--topbar-height);
  }
  .app-shell.sidebar-open .sidebar {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(16, 24, 40, 0.25);
  }
  .app-shell.sidebar-open .sidebar-backdrop {
    display: block;
  }
  .app-shell.sidebar-open {
    overflow: hidden;
  }
  .app-shell .topbar .user-name {
    max-width: 40vw;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}