:root,
[data-theme="light"] {
  --color-bg: #f8f9fc;
  --color-bg-mesh: radial-gradient(ellipse 70% 45% at 15% -5%, rgba(94, 92, 230, 0.07), transparent),
                   radial-gradient(ellipse 50% 35% at 92% 8%, rgba(124, 110, 216, 0.05), transparent);
  --color-surface: rgba(255, 255, 255, 0.92);
  --color-surface-solid: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-border: rgba(15, 23, 42, 0.08);
  --color-border-strong: rgba(15, 23, 42, 0.14);
  --color-text: #111827;
  --color-text-secondary: #4b5563;
  --color-text-muted: #9ca3af;
  --color-text-inverse: #ffffff;
  --color-accent-1: #5e5ce6;
  --gradient-accent: linear-gradient(160deg, #5e5ce6 0%, #7c6ee4 100%);
  --gradient-accent-hover: linear-gradient(160deg, #5452d4 0%, #6e62d8 100%);
  --color-accent-muted: rgba(94, 92, 230, 0.08);
  --color-success: #059669;
  --color-success-bg: rgba(5, 150, 105, 0.1);
  --color-warning: #d97706;
  --color-warning-bg: rgba(217, 119, 6, 0.1);
  --color-error: #dc2626;
  --color-error-bg: rgba(220, 38, 38, 0.08);
  --color-info: #2563eb;
  --color-info-bg: rgba(37, 99, 235, 0.08);
  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.04);
  --shadow-md: 0 4px 20px rgba(17, 24, 39, 0.06);
  --toggle-bg: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] {
  --color-bg: #0c0c10;
  --color-bg-mesh: radial-gradient(ellipse 60% 40% at 12% 0%, rgba(94, 92, 230, 0.12), transparent),
                   radial-gradient(ellipse 45% 35% at 88% 15%, rgba(124, 110, 216, 0.06), transparent);
  --color-surface: rgba(22, 22, 28, 0.88);
  --color-surface-solid: #16161c;
  --color-surface-elevated: #1e1e26;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.12);
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-accent-muted: rgba(124, 120, 232, 0.14);
  --color-success-bg: rgba(5, 150, 105, 0.12);
  --color-warning-bg: rgba(217, 119, 6, 0.15);
  --color-error-bg: rgba(220, 38, 38, 0.12);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.35);
  --toggle-bg: rgba(22, 22, 28, 0.95);
}

:root {
  --font-sans: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --transition: 0.15s ease;
  --sidebar-width: 260px;
}

*, *::before, *::after { box-sizing: border-box; }

html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  background-image: var(--color-bg-mesh);
  background-attachment: fixed;
  min-height: 100vh;
}

a { color: var(--color-accent-1); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: var(--sidebar-width);
  background: var(--color-surface-solid);
  border-right: 1px solid var(--color-border);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: sticky;
  top: 0;
  height: 100vh;
}
.sidebar__brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
  padding: 0.25rem 0.5rem;
}
.sidebar__nav { display: flex; flex-direction: column; gap: 0.25rem; flex: 1; }
.sidebar__link {
  display: block;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
}
.sidebar__link:hover { background: var(--color-accent-muted); text-decoration: none; color: var(--color-text); }
.sidebar__link.is-active { background: var(--color-accent-muted); color: var(--color-accent-1); }
.sidebar__section {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin: 0.75rem 0.5rem 0.25rem;
}
.main { flex: 1; padding: 1.5rem 2rem; max-width: 1200px; }
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.page-header h1 { margin: 0; font-size: 1.5rem; font-weight: 700; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn--primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(94, 92, 230, 0.22);
}
.btn--primary:hover { background: var(--gradient-accent-hover); color: #fff; }
.btn--secondary {
  background: var(--color-surface-solid);
  border-color: var(--color-border-strong);
  color: var(--color-text);
}
.btn--ghost { background: transparent; color: var(--color-text-secondary); }
.btn--danger { background: var(--color-error-bg); color: var(--color-error); border-color: transparent; }

.card {
  background: var(--color-surface-solid);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1rem;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.stat-card .stat-label { color: var(--color-text-muted); font-size: 0.8rem; font-weight: 600; }
.stat-card .stat-value { font-size: 1.5rem; font-weight: 700; margin-top: 0.35rem; }
.stat-card .stat-sub { color: var(--color-text-secondary); font-size: 0.85rem; margin-top: 0.25rem; }

.table-wrap { overflow-x: auto; }
table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
table.data th, table.data td {
  text-align: left;
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid var(--color-border);
}
table.data th { color: var(--color-text-muted); font-weight: 600; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.03em; }
table.data tr:hover td { background: var(--color-accent-muted); }

.form-grid { display: grid; gap: 1rem; max-width: 560px; }
.form-row { display: flex; flex-direction: column; gap: 0.35rem; }
.form-row label { font-size: 0.8rem; font-weight: 600; color: var(--color-text-secondary); }
.form-row input, .form-row select, .form-row textarea {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface-solid);
  color: var(--color-text);
}
.form-row textarea { min-height: 90px; resize: vertical; }
.checkbox-row { display: flex; align-items: center; gap: 0.5rem; }

.badge {
  display: inline-flex;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge--need { background: var(--color-warning-bg); color: var(--color-warning); }
.badge--invoiced { background: var(--color-info-bg); color: var(--color-info); }
.badge--paid { background: var(--color-success-bg); color: var(--color-success); }
.badge--new { background: var(--color-accent-muted); color: var(--color-accent-1); }
.badge--progress { background: var(--color-info-bg); color: var(--color-info); }
.badge--done { background: var(--color-success-bg); color: var(--color-success); }

.alerts { margin-bottom: 1rem; }
.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}
.alert-success { background: var(--color-success-bg); color: var(--color-success); }
.alert-error { background: var(--color-error-bg); color: var(--color-error); }
.alert-warning { background: var(--color-warning-bg); color: var(--color-warning); }

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.login-card { width: 100%; max-width: 400px; }
.login-card h1 { margin-top: 0; }
.filters { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: end; margin-bottom: 1rem; }
.filters .form-row { margin: 0; }
.theme-toggle__btn {
  display: flex; width: 100%; padding: 3px;
  background: var(--color-accent-muted); border-radius: var(--radius-md); border: none;
}
.theme-toggle__option {
  flex: 1; padding: 0.4rem; border: none; border-radius: calc(var(--radius-md) - 2px);
  background: transparent; color: var(--color-text-secondary); font-family: inherit;
  font-size: 0.75rem; font-weight: 600; cursor: pointer;
}
.theme-toggle__option.is-active { background: var(--color-surface-solid); color: var(--color-text); box-shadow: var(--shadow-sm); }

@media (max-width: 860px) {
  .app-shell { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: relative; }
  .main { padding: 1rem; }
}