*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  display: grid;
  grid-template-rows: auto 1fr;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

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

button {
  cursor: pointer;
  font-family: inherit;
}

table {
  border-collapse: collapse;
  width: 100%;
}

img, svg {
  display: block;
  max-width: 100%;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.header .container,
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.header-logo span {
  color: var(--color-primary);
}

.header-user {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.header-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
}

.main {
  padding: 32px 0 64px;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.page-subtitle {
  color: var(--color-text-secondary);
  font-size: 0.925rem;
  margin-bottom: 28px;
  flex-shrink: 0;
}

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

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-title {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: capitalize;
}

.status-badge.paid {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.status-badge.pending {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.status-badge.overdue {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.status-badge.draft {
  background: var(--color-draft-bg);
  color: var(--color-draft);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .main {
    padding: 20px 0 40px;
  }

  .page-title {
    font-size: 1.25rem;
  }
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  text-align: center;
  color: var(--color-text-secondary);
}
.empty-state-icon { font-size: 3rem; margin-bottom: 12px; opacity: 0.5; }
.empty-state-title { font-size: var(--text-xl); font-weight: 600; color: var(--color-text); margin-bottom: 4px; }
.empty-state-desc { font-size: var(--text-base); margin-bottom: 16px; max-width: 280px; }
.empty-state-action { margin-top: 8px; }