:root {
  --page-background: #f4f6f8;
  --surface: #ffffff;
  --surface-muted: #f8fafc;
  --border: #d7dde4;
  --border-strong: #b9c3cf;
  --text-primary: #16202a;
  --text-secondary: #52606d;
  --accent: #1f5f8b;
  --accent-hover: #174b6d;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  --radius: 14px;
  --radius-small: 8px;
  --content-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--page-background);
  color: var(--text-primary);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

.page-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
  padding: 1.25rem 1.5rem;
}

.page-header__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.page-header h1 {
  margin: 0;
  font-size: 1.875rem;
  line-height: 1.2;
}

.header-actions,
.session-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.session-controls {
  flex-wrap: wrap;
  justify-content: flex-end;
}

.session-controls p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.page-header nav a {
  display: inline-flex;
  align-items: center;
  padding: 0.65rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-muted);
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.page-header nav a:hover,
.page-header nav a:focus-visible {
  background: #eef4f8;
  border-color: var(--border-strong);
  color: var(--accent-hover);
}

main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

section + section {
  margin-top: 1.5rem;
}

.section-heading {
  margin-bottom: 1.5rem;
}

.section-heading--toggle {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.section-toggle {
  border: 1px solid var(--border);
  background: var(--surface-muted);
  color: var(--accent);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}

.section-toggle:hover,
.section-toggle:focus-visible {
  background: #eef4f8;
  border-color: var(--border-strong);
  color: var(--accent-hover);
}

.current-debts-actions {
  display: flex;
  align-items: flex-end;
  gap: 0.75rem;
}

.current-debts-sort-control {
  display: grid;
  gap: 0.35rem;
  min-width: 190px;
}

.current-debts-sort-control label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.current-debts-sort-control select {
  padding: 0.45rem 2.2rem 0.45rem 0.75rem;
  font-size: 0.85rem;
}

.section-heading h2 {
  margin: 0 0 0.35rem;
  font-size: 1.375rem;
}

.section-heading p {
  margin: 0;
  color: var(--text-secondary);
}

.chart-mode-toggle {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.9rem;
  padding: 0.25rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-muted);
}

.chart-mode-button {
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.chart-mode-button:hover,
.chart-mode-button:focus-visible {
  color: var(--accent-hover);
}

.chart-mode-button.is-active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.12);
}

.debt-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-helper-text {
  margin: -0.1rem 0 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.4;
}

.form-field--full {
  grid-column: 1 / -1;
}

label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

input,
textarea,
select,
button {
  font: inherit;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-small);
  background: #ffffff;
  color: var(--text-primary);
  padding: 0.8rem 0.9rem;
  line-height: 1.5;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-color: #ffffff;
  padding-right: 2.2rem;
  min-height: calc(1.5em + 1.6rem + 2px);
}

input::placeholder,
textarea::placeholder {
  color: #7b8794;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 95, 139, 0.14);
}

textarea {
  min-height: 120px;
  resize: vertical;
}

.form-actions {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding-top: 0.25rem;
}

button[type="submit"] {
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: #ffffff;
  padding: 0.8rem 1.35rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

button[type="submit"]:hover,
button[type="submit"]:focus-visible {
  background: var(--accent-hover);
}

button[type="submit"]:active {
  transform: translateY(1px);
}

.button-like-label,
button[type="button"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: #ffffff;
  padding: 0.8rem 1.35rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
  text-decoration: none;
}

button[hidden],
[hidden] {
  display: none !important;
}

.auth-panel {
  display: grid;
  gap: 1.5rem;
}

.auth-card {
  margin-top: 0;
  background: var(--surface-muted);
}

.auth-form {
  display: grid;
  gap: 1rem;
}

.account-tools {
  margin-top: 1.5rem;
}

.account-tool-card {
  margin-top: 0;
}

.auth-status {
  margin: 0;
  border: 1px dashed var(--border-strong);
  border-radius: 12px;
  background: var(--surface-muted);
  color: var(--text-secondary);
  padding: 1rem 1.1rem;
}

.button-like-label:hover,
.button-like-label:focus-visible,
button[type="button"]:hover,
button[type="button"]:focus-visible {
  background: var(--accent-hover);
}

.button-like-label:active,
button[type="button"]:active {
  transform: translateY(1px);
}

.debts-list {
  display: grid;
  gap: 1rem;
}

.debt-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-muted);
  padding: 1rem 1.1rem;
}

.debt-card h3 {
  margin: 0 0 0.65rem;
  font-size: 1.05rem;
}

.debt-card p {
  margin: 0.35rem 0 0;
  color: var(--text-secondary);
}

.debts-list > p {
  margin: 0;
  border: 1px dashed var(--border-strong);
  border-radius: 12px;
  background: var(--surface-muted);
  color: var(--text-secondary);
  padding: 1rem 1.1rem;
}

.summary-cards,
.projection-descriptions,
.strategy-cards,
.recommendation-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.guidance-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

.guidance-row section {
  margin-top: 0;
}

.summary-card,
.projection-card,
.strategy-card,
.recommendation-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-muted);
  padding: 1rem 1.1rem;
}

.summary-card h3,
.projection-card h3,
.strategy-card h3,
.recommendation-card h3 {
  margin: 0 0 0.65rem;
  font-size: 1.05rem;
}

.summary-card p,
.projection-card p,
.strategy-card p,
.recommendation-card p,
.strategy-highlight p,
.extra-payment-note {
  margin: 0;
  color: var(--text-secondary);
}

.strategy-highlight,
.strategy-insights {
  margin-top: 1rem;
}

.strategy-highlight {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-muted);
  padding: 1rem 1.1rem;
}

.strategy-insights p + p {
  margin-top: 0.35rem;
}

.extra-payment-controls,
.extra-payment-target,
.advisor-preview-controls {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.extra-payment-target {
  margin-top: 1rem;
}

.advisor-preview-controls {
  margin-top: 0.5rem;
}

.advisor-mode {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-top: 0.2rem;
}

.advisor-mode__label {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.advisor-mode__toggle {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.advisor-mode__button {
  width: auto;
  border-radius: 999px;
  padding-inline: 1rem;
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.advisor-mode__button.is-active {
  background: var(--text-primary);
  color: var(--surface);
  border-color: var(--text-primary);
}

.advisor-preview-list {
  display: grid;
  gap: 0.85rem;
}

.advisor-preview-item {
  border-top: 1px solid var(--border);
  padding-top: 0.85rem;
}

.advisor-preview-item.is-best-option {
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: var(--surface);
  padding: 1rem 1rem 0.9rem;
}

.advisor-preview-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.advisor-preview-item h4 {
  margin: 0 0 0.45rem;
  font-size: 1rem;
}

.advisor-preview-item p + p {
  margin-top: 0.35rem;
}

.advisor-flags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.6rem;
}

.advisor-flag {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-secondary);
  padding: 0.2rem 0.6rem;
  font-size: 0.85rem;
}

.badge-strong,
.badge-acceleration {
  border-color: var(--border-strong);
  background: var(--surface);
  color: var(--text-primary);
}

.badge-slow {
  background: var(--surface-muted);
}

.chain-info {
  margin-top: 0.65rem;
  padding: 0.75rem 0.85rem;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.chain-info p + p {
  margin-top: 0.3rem;
}

.timeline-preview {
  margin-top: 0.75rem;
  padding: 0.75rem;
  border-radius: 10px;
  background: var(--surface-muted);
  border: 1px solid var(--border);
}

.timeline-preview h5 {
  margin: 0 0 0.4rem;
  font-size: 0.85rem;
  text-transform: none;
  opacity: 0.7;
}

.timeline-preview ul {
  margin: 0;
  padding-left: 1rem;
}

.why-this-wins {
  margin-top: 0.75rem;
  padding: 0.75rem;
  border-radius: 10px;
  background: var(--surface-muted);
  border: 1px solid var(--border);
}

.why-this-wins strong {
  display: block;
  margin-bottom: 0.35rem;
}

.advisor-action-panel {
  margin-top: 0.85rem;
}

.advisor-action-note {
  margin-top: 0.55rem;
  color: var(--text-secondary);
}

.advisor-preview-note {
  color: var(--text-secondary);
}

.advisor-confirmation {
  margin-top: 0.75rem;
  padding: 0.85rem;
  border-radius: 10px;
  background: var(--surface-muted);
  border: 1px solid var(--border);
}

.advisor-confirmation h5 {
  margin: 0 0 0.55rem;
  font-size: 0.9rem;
}

.advisor-confirmation-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.2rem 0.65rem;
  margin: 0;
}

.advisor-confirmation-list dt {
  font-weight: 600;
}

.advisor-confirmation-list dd {
  margin: 0 0 0.35rem;
  color: var(--text-secondary);
}

.advisor-confirmation-note {
  margin-top: 0.35rem;
  color: var(--text-secondary);
}

.advisor-history {
  display: grid;
  gap: 0.85rem;
  margin-top: 0.5rem;
}

.advisor-history-item h3 {
  margin-bottom: 0.45rem;
}

.advisor-history-item p + p {
  margin-top: 0.35rem;
}

.advisor-history-item--applied {
  border-left: 4px solid var(--accent);
}

.advisor-history-item--reverted {
  border-left: 4px solid var(--border-strong);
  background: var(--surface-muted);
}

.advisor-history-status {
  display: inline-flex;
  align-items: center;
  margin-bottom: 0.55rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}

.advisor-history-status--applied {
  background: #e8f2f8;
  color: var(--accent-hover);
}

.advisor-history-status--reverted {
  background: #eef2f6;
  color: var(--text-secondary);
}

.advisor-history-note {
  color: var(--text-secondary);
}

.best-option-label {
  display: inline-flex;
  align-items: center;
  margin-bottom: 0.6rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text-primary);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  text-transform: none;
}

.apply-extra-payment-button[hidden] {
  display: none;
}

.apply-extra-payment-button {
  align-self: flex-start;
  margin-top: 0.25rem;
}

.apply-extra-payment-button:disabled {
  background: var(--border-strong);
  cursor: not-allowed;
  transform: none;
}

.payoff-chart-container {
  position: relative;
  width: 100%;
  min-height: 240px;
  height: clamp(240px, 38vw, 360px);
  margin-top: 1rem;
}

.payoff-chart-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

@media (max-width: 720px) {
  .page-header__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions,
  .session-controls {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  main {
    padding: 1.5rem 1rem 2.5rem;
  }

  section {
    padding: 1.25rem;
  }

  .debt-form {
    grid-template-columns: 1fr;
  }

  .form-field--full,
  .form-actions {
    grid-column: auto;
  }

  button[type="submit"],
  button[type="button"],
  .button-like-label {
    width: 100%;
    justify-content: center;
  }

  .payoff-chart-container {
    height: clamp(220px, 52vw, 300px);
  }

  .guidance-row {
    grid-template-columns: 1fr;
  }

  .current-debts .section-heading--toggle,
  .current-debts-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .current-debts-actions,
  .current-debts-sort-control {
    width: 100%;
  }

  .chart-mode-toggle {
    width: 100%;
    border-radius: 1rem;
  }

  .chart-mode-button {
    flex: 1 1 12rem;
    text-align: center;
  }

  .advisor-mode__toggle {
    width: 100%;
    flex-direction: column;
  }

  .advisor-mode__button {
    width: 100%;
    justify-content: center;
  }
}