:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: #102a43;
  background-color: #f4f7fb;

  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-strong: #f8fbff;
  --text: #102a43;
  --text-muted: #627d98;
  --border: #d9e2ec;
  --border-strong: #cbd6e2;
  --accent: #2f6fda;
  --accent-strong: #1f4ed8;
  --error: #c92a2a;
  --error-soft: #ffe5e5;
  --shadow-soft: 0 12px 30px rgba(16, 42, 67, 0.06);
  --radius: 24px;
  --radius-sm: 18px;
  --spacing-xs: 0.75rem;
  --spacing-sm: 1rem;
  --spacing: 1.5rem;
  --spacing-md: 2rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 3.5rem;
  --chart-height: 240px;
}

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

html {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: var(--spacing-lg) var(--spacing-sm) var(--spacing-xl);
  background-color: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

body,
p,
li,
small {
  margin: 0;
}

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

button,
input,
select,
textarea {
  font: inherit;
  border: none;
  border-radius: 12px;
}

button {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(47, 111, 218, 0.5);
  outline-offset: 3px;
}

a {
  color: inherit;
  text-decoration: none;
}

main {
  max-width: 1260px;
  margin: 0 auto;
}

.dashboard-header {
  max-width: 1260px;
  margin: 0 auto var(--spacing-xl);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.page-intro {
  flex: 1;
  padding: var(--spacing-lg);
  background: linear-gradient(180deg, #ffffff 0%, #f6f9ff 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.eyebrow {
  display: inline-block;
  margin-bottom: var(--spacing-xs);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

header h1 {
  margin-bottom: var(--spacing-xs);
  font-size: clamp(2rem, 2.4vw, 3rem);
  line-height: 1.05;
}

header p {
  max-width: 60ch;
  color: var(--text-muted);
  margin-top: 0.75rem;
}

.logout-btn {
  flex-shrink: 0;
  min-height: 48px;
  padding: 0 1.25rem;
  font-weight: 700;
  color: var(--accent-strong);
  background-color: #ffffff;
  border: 1px solid var(--border);
  border-radius: 999px;
}

.auth-screen {
  min-height: calc(100vh - 4rem);
  display: grid;
  place-items: center;
  padding: var(--spacing-lg) var(--spacing-sm);
}

#dashboard-shell {
  display: none;
}

.login-card {
  width: min(100%, 420px);
  padding: var(--spacing-lg);
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.login-card h2 {
  margin-bottom: var(--spacing-xs);
  font-size: 1.75rem;
}

.login-subtitle {
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
}

.section-header {
  margin-bottom: var(--spacing-lg);
}

.section-header h2 {
  margin-bottom: var(--spacing-xs);
  font-size: 1.55rem;
}

.section-header p {
  color: var(--text-muted);
  max-width: 70ch;
}

form {
  background-color: var(--surface);
  padding: var(--spacing-lg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

#login-form {
  padding: 0;
  border: none;
  box-shadow: none;
  background: transparent;
}

.form-grid {
  display: grid;
  gap: var(--spacing-lg);
}

fieldset {
  border: 1px solid var(--border-strong);
  padding: var(--spacing-lg);
  border-radius: var(--radius-sm);
  background-color: var(--surface-strong);
}

legend {
  padding: 0 var(--spacing-xs);
  font-weight: 700;
  color: var(--text);
}

.form-field {
  display: grid;
  gap: var(--spacing-xs);
}

.form-field label {
  font-weight: 600;
  color: var(--text);
}

.form-field input,
.form-field select {
  width: 100%;
  min-height: 48px;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  background-color: #ffffff;
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-field input:focus,
.form-field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(47, 111, 218, 0.12);
}

.form-field small {
  color: var(--text-muted);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.auth-actions {
  margin-top: var(--spacing-md);
}

button#calculate-btn,
button#login-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 1.75rem;
  font-weight: 700;
  color: #ffffff;
  background-color: var(--accent);
  border-radius: 999px;
  transition: background-color 0.2s ease;
}

button#calculate-btn:hover,
button#login-btn:hover {
  background-color: var(--accent-strong);
}

button#calculate-btn:disabled,
button#login-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

#loading-spinner,
#auth-spinner {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.form-error {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  background-color: var(--error-soft);
  color: var(--error);
  border: 1px solid rgba(201, 42, 42, 0.15);
  display: none;
}

.form-error.visible {
  display: block;
}

#summary-cards {
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

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

.summary-card__label {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.summary-card__value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
}

.charts-grid {
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.chart-panel {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-soft);
  min-height: calc(var(--chart-height) + 100px);
  display: flex;
  flex-direction: column;
}

.chart-panel h3 {
  margin: 0 0 var(--spacing-sm);
  font-size: 1.05rem;
}

.chart-panel canvas {
  width: 100%;
  height: var(--chart-height);
  max-height: var(--chart-height);
}

.chart-panel p {
  margin-top: var(--spacing-sm);
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 1100px;
}

.table-container {
  overflow: auto;
  max-height: 70vh;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--surface);
  box-shadow: var(--shadow-soft);
}

caption {
  caption-side: top;
  text-align: left;
  padding: var(--spacing-md);
  font-size: 0.95rem;
  color: var(--text-muted);
}

thead {
  background-color: #f8fbff;
}

th,
td {
  padding: 0.95rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 700;
  color: var(--text);
}

thead th {
  position: sticky;
  top: 0;
  z-index: 3;
  background-color: #f8fbff;
}

thead th:first-child,
tbody td:first-child {
  position: sticky;
  left: 0;
  z-index: 2;
  background-color: var(--surface);
}

thead th:first-child {
  z-index: 4;
  background-color: #f8fbff;
}

tbody tr:nth-child(even) td:first-child {
  background-color: #fcfdff;
}

tbody tr:hover {
  background-color: #f4f7fb;
}

tbody tr:hover td:first-child {
  background-color: #f4f7fb;
}

footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.95rem;
}

@media (max-width: 900px) {
  body {
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
  }

  .dashboard-header {
    flex-direction: column;
    align-items: stretch;
  }

  .logout-btn {
    align-self: flex-start;
  }

  .form-grid {
    gap: var(--spacing-md);
  }
}

@media (max-width: 720px) {
  .form-grid {
    display: flex;
    flex-direction: column;
  }

  fieldset {
    padding: var(--spacing-md);
  }

  .form-actions {
    flex-direction: column;
    align-items: stretch;
  }

  button#calculate-btn,
  button#login-btn {
    width: 100%;
  }

  .chart-panel {
    min-height: auto;
  }

  .chart-panel canvas {
    min-height: 220px;
  }
}

@media (max-width: 560px) {
  header,
  form,
  .page-intro,
  .chart-panel,
  .table-container,
  .summary-card {
    border-radius: 18px;
  }

  body {
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
  }

  th,
  td {
    padding: 0.85rem 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}