:root {
  --app-bg: #f8fafc;
  --surface: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --brand-primary: #2563eb;
  --brand-primary-hover: #1d4ed8;
  --brand-subtle: #eff6ff;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --radius-card: 14px;
  --radius-inner: 10px;
  --radius-btn: 8px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--app-bg);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Accessible interactive elements */
a,
button {
  cursor: pointer;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

/* Header & Nav */
.site-header {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1020;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-inner);
  background: var(--brand-subtle);
  color: var(--brand-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Biodata Card */
.biodata-card {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.05);
  max-width: 640px;
}

.biodata-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--brand-subtle);
  color: var(--brand-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.data-label {
  font-size: 0.775rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.025em;
  margin-bottom: 0.25rem;
}

.data-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0;
  word-break: break-word;
}

/* Task Accordion List */
.task-list-item {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card) !important;
  margin-bottom: 0.75rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.task-list-item:hover {
  border-color: var(--border-hover);
}

.task-list-btn {
  background: transparent;
  border: none;
  width: 100%;
  min-height: 52px;
  padding: 0.875rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  border-radius: var(--radius-card);
  transition: background-color 0.15s ease;
}

.task-list-btn:hover {
  background-color: #f1f5f9;
}

.task-chevron {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
  margin-right: 0.75rem;
}

.task-list-btn[aria-expanded="true"] .task-chevron {
  transform: rotate(90deg);
}

.task-badge-has {
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--brand-subtle);
  color: var(--brand-primary);
  border: 1px solid #bfdbfe;
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
}

.task-badge-empty {
  font-size: 0.75rem;
  font-weight: 500;
  background: #f8fafc;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
}

/* Inner Task Item */
.inner-task-card {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-inner);
  padding: 0.875rem 1rem;
  margin-bottom: 0.5rem;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.inner-task-card:hover {
  background: #ffffff;
  border-color: #93c5fd;
}

.inner-task-title {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-primary);
}

.btn-task-action {
  min-height: 40px;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-btn);
  padding: 0.45rem 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  text-decoration: none;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  html {
    scroll-padding-top: 70px;
  }

  .biodata-card {
    border-radius: var(--radius-inner);
  }

  .task-list-btn {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
  }

  .inner-task-card {
    flex-direction: column;
    align-items: flex-start !important;
    gap: 0.75rem;
  }

  .inner-task-action-wrapper {
    width: 100%;
  }

  .btn-task-action,
  .badge-current-page {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .site-header .fs-5 {
    font-size: 1rem !important;
  }
}