/* ============================================================
   Money Tools — "Fiscal Precision" Design System
   Corporate / modern / minimal. Forest-green brand, tri-font
   typography, low-contrast outlines with ambient shadows.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Work+Sans:wght@500;600;700&family=IBM+Plex+Sans:wght@400;500;600&family=JetBrains+Mono:wght@500;600&display=swap');

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

canvas {
  max-width: 100%;
  height: auto;
}

:root {
  /* Surfaces */
  --bg: #f7f9fb;
  --surface: #ffffff;
  --surface-container-low: #f2f4f6;
  --surface-container: #eceef0;
  --surface-container-high: #e6e8ea;

  /* Brand */
  --primary: #0369a1;          /* light blue */
  --primary-hover: #075985;
  --primary-container: #0284c7;
  --on-primary: #ffffff;

  /* Text */
  --text: #191c1e;             /* on-surface */
  --text-secondary: #545f73;   /* charcoal-blue secondary */
  --text-muted: #6f7a6e;       /* outline */

  /* Accents */
  --tertiary: #005c8e;         /* deep sea blue */
  --tertiary-container: #eef5ff;
  --secondary: #545f73;        /* slate */
  --success: #15803d;          /* green — positive/gains */
  --warning: #d97706;          /* amber */
  --danger: #ba1a1a;           /* error red */

  /* Lines */
  --border: #dce1e4;
  --border-strong: #c4ccce;

  /* Elevation — subtle, highly diffused */
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 2px 4px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 4px 16px rgba(15, 23, 42, 0.08);

  /* Shape — "soft" */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;

  /* Type */
  --font-head: 'Work Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

/* ---------------------------------------------------------- Header */
.site-header {
  background: linear-gradient(135deg, #0c4a6e 0%, #0284c7 100%);
  color: #fff;
  padding: 52px 0 44px;
  text-align: center;
  position: relative;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header h1 {
  font-family: var(--font-head);
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.site-header p {
  font-size: 1.1rem;
  opacity: 0.85;
  margin-top: 8px;
  font-weight: 400;
}

/* ---------------------------------------------------------- Footer */
.site-footer {
  background: #2d3133;
  color: #b6bec0;
  text-align: center;
  padding: 22px 0;
  margin-top: auto;
  font-size: 0.9rem;
}

/* ---------------------------------------------------- Tool grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 40px 0;
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid transparent;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-top-color: var(--primary);
}

.tool-card .icon {
  font-size: 2rem;
  margin-bottom: 12px;
  line-height: 1;
}

.tool-card h2 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.tool-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex: 1;
}

/* ------------------------------------------- Calculator page */
.calculator-page {
  max-width: 800px;
  margin: 40px auto;
  padding: 0 20px;
}

.calculator-page h1 {
  font-family: var(--font-head);
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.calculator-page .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.calculator-page .breadcrumb a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.calculator-page .breadcrumb a:hover {
  text-decoration: underline;
}

/* --------------------------------------------------- Cards */
.calc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
  margin-bottom: 24px;
}

.calc-card h2 {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.01em;
}

/* --------------------------------------------------- Forms */
.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.form-group .input-wrapper {
  position: relative;
}

.form-group .input-wrapper .suffix {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  pointer-events: none;
}

input[type="number"],
input[type="text"],
input[type="date"],
select {
  width: 100%;
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-container-low);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  outline: none;
  -moz-appearance: textfield;
}

select {
  cursor: pointer;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input:focus,
select:focus {
  border-color: var(--primary);
  background: var(--surface);
  box-shadow: 0 0 0 3px rgba(3, 105, 161, 0.18);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* --------------------------------------------------- Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 24px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.05s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 1px 2px rgba(3, 105, 161, 0.25);
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  background: var(--surface-container-low);
  border-color: var(--text-secondary);
}

/* --------------------------------------------------- Results */
.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.results-grid-wide {
  grid-template-columns: repeat(4, 1fr);
}

.result-item {
  text-align: center;
  padding: 18px 12px;
  background: var(--surface-container-low);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.result-item .label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.result-item .value {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text);
  word-break: break-word;
}

.result-item .value.primary {
  color: var(--primary);
}

.result-item .value.success {
  color: var(--success);
}

.result-item .value.danger {
  color: var(--danger);
}

/* --------------------------------------------------- Charts */
.chart-container {
  max-width: 320px;
  width: 100%;
  margin: 0 auto 24px;
  overflow: hidden;
}

.chart-container-wide {
  max-width: 500px;
  width: 100%;
  margin: 0 auto 24px;
  overflow: hidden;
}

.chart-container canvas,
.chart-container-wide canvas {
  max-width: 100%;
  height: auto;
}

/* --------------------------------------------------- Tables */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

table th {
  background: var(--surface-container);
  text-align: left;
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-strong);
  white-space: nowrap;
}

table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
}

table tbody tr:nth-child(even) {
  background: var(--surface-container-low);
}

table tbody tr:hover {
  background: var(--surface-container-high);
}

table .text-right {
  text-align: right;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------- Category tabs */
.category-tabs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  padding: 32px 0 0;
}

.category-tab {
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  white-space: nowrap;
}

.category-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--surface-container-low);
}

.category-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.tool-card.hidden {
  display: none;
}

/* --------------------------------------------------- Responsive */
@media (max-width: 640px) {
  .site-header {
    padding: 34px 0 30px;
  }

  .site-header h1 {
    font-size: 1.6rem;
  }

  .site-header p {
    font-size: 0.95rem;
  }

  .category-tabs {
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
  }

  .category-tab {
    padding: 8px 6px;
    font-size: 0.75rem;
    white-space: normal;
  }

  .tools-grid {
    grid-template-columns: 1fr;
    padding: 24px 0;
  }

  .calc-card {
    padding: 20px;
  }

  .results-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .result-item {
    padding: 14px 8px;
  }

  .result-item .label {
    font-size: 0.65rem;
  }

  .result-item .value {
    font-size: 1.1rem;
  }

  .chart-container {
    max-width: 260px;
  }

  .chart-container-wide {
    max-width: 100%;
  }

  table {
    font-size: 0.75rem;
  }

  table th,
  table td {
    padding: 6px 8px;
  }
}

@media (max-width: 480px) {
  .category-tabs {
    grid-template-columns: 1fr 1fr;
  }

  .category-tab {
    padding: 8px 6px;
    font-size: 0.75rem;
    white-space: normal;
  }
}

@media (max-width: 400px) {
  .site-header {
    padding: 26px 0 22px;
  }

  .site-header h1 {
    font-size: 1.35rem;
  }

  .site-header p {
    font-size: 0.85rem;
  }

  .calculator-page {
    margin: 20px auto;
    padding: 0 12px;
  }

  .calc-card {
    padding: 16px;
  }

  .results-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .result-item .value {
    font-size: 1rem;
  }

  .chart-container {
    max-width: 220px;
  }

  .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
  }
}