:root {
  --bg: #0f172a;
  --card: #1e293b;
  --card-border: #334155;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #22c55e;
  --accent-hover: #16a34a;
  --danger: #ef4444;
  --radius: 10px;
  --input-bg: #0f172a;
  --row-hover: rgba(255,255,255,0.03);
}

html[data-theme="light"] {
  --bg: #f4f6f8;
  --card: #ffffff;
  --card-border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --accent: #16a34a;
  --accent-hover: #15803d;
  --danger: #dc2626;
  --input-bg: #ffffff;
  --row-hover: rgba(0,0,0,0.03);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.2s ease, color 0.2s ease;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 76px 16px 60px;
}

.container.no-topbar { padding-top: 24px; }

/* Top bar (mobile-first: always visible, holds hamburger) */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: var(--card);
  border-bottom: 1px solid var(--card-border);
  z-index: 30;
}

.hamburger {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text);
  font-size: 1.1rem;
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  line-height: 1;
}
.hamburger:hover { background: var(--row-hover); }

/* Off-canvas sidebar */
.sidebar {
  position: fixed;
  top: 0; bottom: 0; left: 0;
  width: 250px;
  background: var(--card);
  border-right: 1px solid var(--card-border);
  z-index: 50;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform 0.25s ease;
}
.sidebar.open { transform: translateX(0); }

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--card-border);
}

.sidebar-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 4px 8px;
}

.sidebar-user {
  padding: 14px 16px;
  border-bottom: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  padding: 10px 0;
  flex: 1;
}

.sidebar-nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  padding: 13px 18px;
}

.sidebar-nav a:hover { background: var(--row-hover); color: var(--accent); }

.sidebar-footer {
  padding: 14px 16px;
  border-top: 1px solid var(--card-border);
}

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
.sidebar-overlay.open { opacity: 1; pointer-events: auto; }

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent) !important;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}

h1, h2, h3 { margin-top: 0; }

.muted { color: var(--text-muted); font-size: 0.9rem; }

.upload-form {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
}

.field { display: flex; flex-direction: column; gap: 6px; }

label { font-size: 0.85rem; color: var(--text-muted); }

input[type="file"],
input[type="date"],
input[type="text"],
input[type="password"] {
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.95rem;
}

button, .btn {
  background: var(--accent);
  color: #052e13;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.95rem;
  text-decoration: none;
  display: inline-block;
}

button:hover, .btn:hover { background: var(--accent-hover); }

.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #dc2626; }

.error-box {
  background: #451a1a;
  border: 1px solid var(--danger);
  color: #fecaca;
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--card-border);
}

th { color: var(--text-muted); font-size: 0.85rem; text-transform: uppercase; }

tr:hover { background: var(--row-hover); }

.total-row td {
  font-weight: 700;
  color: var(--accent);
  border-top: 2px solid var(--accent);
  border-bottom: none;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-box {
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
}

.stat-box .value { font-size: 1.6rem; font-weight: 700; color: var(--accent); }
.stat-box .label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card { width: 100%; max-width: 360px; }

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}

@media (max-width: 480px) {
  .container { padding: 68px 12px 50px; }
  .container.no-topbar { padding-top: 16px; }

  h1 { font-size: 1.3rem; }
  h2 { font-size: 1.1rem; }

  .card { padding: 16px; }

  .upload-form { flex-direction: column; align-items: stretch; }
  .upload-form .field { width: 100%; }
  .upload-form input[type="date"],
  .upload-form input[type="file"] { width: 100%; }
  .upload-form button { width: 100%; margin-top: 4px; }

  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat-box { padding: 12px; }
  .stat-box .value { font-size: 1.25rem; }

  table { font-size: 0.85rem; }
  th, td { padding: 8px 6px; }

  .login-card { max-width: 100%; }
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
}
.theme-toggle:hover { background: var(--row-hover); }

.badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--row-hover);
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  margin-left: 6px;
}
.badge-admin { color: var(--accent); border-color: var(--accent); }

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
  padding: 0;
  font-size: inherit;
}

.notice-box {
  background: rgba(34,197,94,0.12);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
}