/* ==========================================================================
   円金利.com — 実務データサイト然としたシンプルな配色
   装飾を削り、官公庁の統計ページ寄りの見た目にする。
   ========================================================================== */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f4f4f4;
  --color-surface: #fafafa;
  --color-border: #c9c9c9;
  --color-border-strong: #999999;

  --color-text: #1a1a1a;
  --color-text-dim: #555555;
  --color-text-faint: #888888;

  --color-link: #0b4f8a;
  --color-accent: #b5361a;
  --color-positive: #1a6b3c;

  --font-body: "Hiragino Kaku Gothic ProN", "Meiryo", "Yu Gothic", sans-serif;
  --font-mono: "Consolas", "Courier New", monospace;

  --curve-color-1: #0b4f8a;
  --curve-color-2: #b5361a;
  --curve-color-3: #1a6b3c;
  --curve-color-4: #8a5a0b;
  --curve-color-5: #5a3d8a;
  --curve-color-6: #444444;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  overflow-x: hidden;
  width: 100%;
}

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

code {
  font-family: var(--font-mono);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  padding: 0 4px;
  font-size: 0.85em;
}

/* ---- header ---- */

.site-header {
  border-bottom: 2px solid var(--color-text);
  background: var(--color-bg);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-mark {
  font-weight: 700;
  font-size: 20px;
}

.brand-text {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.brand-name {
  font-size: 19px;
  font-weight: 700;
}

.brand-dotcom {
  color: var(--color-text-faint);
  font-weight: 400;
  font-size: 15px;
}

.brand-sub {
  font-size: 12px;
  color: var(--color-text-faint);
}

.version-badge {
  border: 1px solid var(--color-border);
  padding: 0 5px;
  margin-left: 4px;
  font-size: 10.5px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13.5px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  flex-wrap: wrap;
}

.lang-btn {
  background: none;
  border: 1px solid transparent;
  color: var(--color-text-faint);
  font-size: 12.5px;
  cursor: pointer;
  padding: 3px 8px;
  border-radius: 999px;
  white-space: nowrap;
  text-decoration: none;
  display: inline-block;
}

.lang-btn:hover {
  border-color: var(--color-border);
}

.lang-btn.is-active {
  color: var(--color-text);
  font-weight: 700;
  border-color: var(--color-border-strong);
  background: var(--color-bg-alt);
}

.nav-link {
  text-decoration: none;
  color: var(--color-text-dim);
  padding-bottom: 2px;
}

.nav-link.is-active {
  color: var(--color-text);
  border-bottom: 2px solid var(--color-accent);
  font-weight: 700;
}

.nav-link.is-disabled {
  color: var(--color-text-faint);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.soon {
  font-size: 10px;
  border: 1px solid var(--color-border);
  color: var(--color-text-faint);
  padding: 0 5px;
}

/* ---- page layout (2カラム: サイドバー + メインコンテンツ) ---- */

.page-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: flex-start;
  gap: 32px;
}

.sidebar {
  width: 240px;
  flex-shrink: 0;
  padding: 24px 20px 24px 0;
  border-right: 1px solid var(--color-border);
}

.sidebar-title {
  font-size: 13px;
  font-weight: 700;
  margin: 0 0 4px;
  padding-top: 18px;
}

.sidebar-title:first-child { padding-top: 0; }

.sidebar-note {
  font-size: 11px;
  color: var(--color-text-faint);
  margin: 0 0 8px;
}

.indicator-list,
.event-list {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
  border-top: 1px solid var(--color-border-soft, var(--color-border));
}

.indicator-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px solid var(--color-bg-alt);
  font-size: 12.5px;
}

.event-item {
  padding: 7px 0;
  border-bottom: 1px solid var(--color-bg-alt);
  font-size: 12.5px;
}

.event-main {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.event-sub {
  display: flex;
  gap: 10px;
  margin-top: 2px;
  font-size: 11px;
  color: var(--color-text-faint);
}

.indicator-name,
.event-name {
  color: var(--color-text-dim);
}

.indicator-value,
.event-value {
  font-family: var(--font-mono);
  color: var(--color-text-faint);
}

.main-content {
  flex: 1;
  min-width: 0;
}

/* ---- hero ---- */

.hero {
  padding: 26px 0 20px;
  border-bottom: 1px solid var(--color-border);
}

.hero-title {
  font-size: 26px;
  line-height: 1.3;
  font-weight: 700;
  margin: 0 0 6px;
}

.hero-lead {
  font-size: 14px;
  color: var(--color-text-dim);
  margin: 0;
}

/* ---- controls ---- */

.controls {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
}

.control-label {
  font-size: 12px;
  color: var(--color-text-dim);
  margin-right: 8px;
}

.date-picker-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.date-input {
  background: #fff;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 6px 8px;
}

.date-input:focus-visible,
.btn:focus-visible,
.chip:focus-visible,
.toggle-btn:focus-visible {
  outline: 2px solid var(--color-link);
  outline-offset: 1px;
}

.btn {
  font-family: var(--font-body);
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid var(--color-border-strong);
  cursor: pointer;
  background: #fff;
  color: var(--color-text);
}

.btn:hover { background: var(--color-bg-alt); }

.btn-primary {
  background: var(--color-text);
  color: #fff;
  border-color: var(--color-text);
  font-weight: 700;
}

.btn-primary:hover { background: #333; }

.shortcut-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.chip {
  font-size: 12.5px;
  background: #fff;
  border: 1px solid var(--color-border);
  color: var(--color-text-dim);
  padding: 5px 12px;
  cursor: pointer;
}

.chip:hover {
  border-color: var(--color-text-dim);
  color: var(--color-text);
}

.selected-dates {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 30px;
}

.date-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 4px 4px 4px 10px;
  border: 1px solid;
  background: #fff;
}

.date-chip .remove-btn {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
  padding: 2px 6px;
}

.date-chip .remove-btn:hover { background: var(--color-bg-alt); }

.date-chip.not-found {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---- chart section ---- */

.chart-section {
  padding: 24px 0 4px;
}

.chart-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.chart-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.chart-title {
  font-size: 16px;
  font-weight: 700;
  margin: 0;
  border-left: 4px solid var(--color-text);
  padding-left: 8px;
}

.yield-toggle {
  display: flex;
  border: 1px solid var(--color-border-strong);
}

.toggle-btn {
  font-size: 12px;
  background: #fff;
  color: var(--color-text-dim);
  border: none;
  padding: 6px 12px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  border-right: 1px solid var(--color-border);
}

.toggle-btn:last-child { border-right: none; }

.toggle-btn.is-active {
  background: var(--color-text);
  color: #fff;
}

.toggle-hint {
  font-size: 9px;
  color: inherit;
  opacity: 0.7;
}

.chart-canvas-wrap {
  background: #fff;
  border: 1px solid var(--color-border);
  padding: 16px 12px 8px;
  position: relative;
  height: 460px;
}

.chart-footnote {
  font-size: 11.5px;
  color: var(--color-text-faint);
  margin: 8px 2px 0;
}

/* ---- table ---- */

.table-section {
  padding: 28px 0 40px;
}

.data-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
}

table.yield-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12.5px;
}

table.yield-table th,
table.yield-table td {
  padding: 7px 12px;
  text-align: right;
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  white-space: nowrap;
}

table.yield-table th:last-child,
table.yield-table td:last-child { border-right: none; }

table.yield-table th:first-child,
table.yield-table td:first-child {
  text-align: left;
  color: var(--color-text-dim);
  background: var(--color-bg-alt);
}

table.yield-table thead th {
  background: var(--color-bg-alt);
  color: var(--color-text);
  font-weight: 700;
  font-size: 11.5px;
}

table.yield-table tbody tr:nth-child(even) {
  background: var(--color-surface);
}

.empty-state {
  padding: 32px 16px;
  text-align: center;
  color: var(--color-text-faint);
  font-size: 13px;
}

/* ---- usage section ---- */

.usage-section {
  padding: 8px 0 50px;
  border-top: 1px solid var(--color-border);
  margin-top: 8px;
  padding-top: 28px;
}

.usage-steps {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.usage-step {
  display: flex;
  gap: 12px;
  border: 1px solid var(--color-border);
  padding: 16px;
  background: var(--color-surface);
}

.usage-step-number {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-border-strong);
  line-height: 1;
}

.usage-step-title {
  font-size: 13.5px;
  font-weight: 700;
  margin: 0 0 6px;
}

.usage-step-body {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--color-text-dim);
  margin: 0;
}

/* ---- doc pages (計算方法・免責事項) ---- */

.doc-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.doc-title {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 28px;
  border-left: 4px solid var(--color-text);
  padding-left: 10px;
}

.doc-section {
  margin-bottom: 28px;
}

.doc-section h2 {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-border);
}

.doc-section p {
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--color-text-dim);
  margin: 0 0 10px;
}

.doc-list {
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--color-text-dim);
  padding-left: 20px;
  margin: 0 0 10px;
}

/* ---- release notes ---- */

.release-entry {
  border: 1px solid var(--color-border);
  padding: 20px;
  margin-bottom: 20px;
}

.release-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.release-version {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
}

.release-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-faint);
}

.release-summary {
  font-size: 13.5px;
  color: var(--color-text-dim);
  margin: 0 0 10px;
}

.release-list {
  font-size: 13px;
  line-height: 1.9;
  color: var(--color-text-dim);
  padding-left: 20px;
  margin: 0;
}

/* ---- blog ---- */

.blog-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}

.blog-list-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

.blog-list-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-faint);
  flex-shrink: 0;
}

.blog-list-title {
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text);
}

.blog-list-title:hover { color: var(--color-link); }

.blog-detail-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-faint);
  margin: 0 0 8px;
}

.blog-body {
  font-size: 14.5px;
  line-height: 2;
  color: var(--color-text-dim);
  margin: 24px 0;
}

.blog-body p { margin: 0 0 1.2em; }

.blog-back {
  font-size: 13px;
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* ---- contact form ---- */

.contact-sent {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 14px 16px;
  font-size: 13.5px;
  color: var(--color-text-dim);
  margin: 0 0 20px;
}

.contact-form {
  margin-top: 20px;
  max-width: 480px;
}

.contact-honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.contact-field {
  margin-bottom: 18px;
}

.contact-field label {
  display: block;
  font-size: 12.5px;
  color: var(--color-text-dim);
  margin-bottom: 6px;
}

.contact-field input[type="text"],
.contact-field input[type="email"],
.contact-field textarea {
  width: 100%;
  border: 1px solid var(--color-border-strong);
  background: #fff;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 13.5px;
  padding: 8px 10px;
  box-sizing: border-box;
}

.contact-field textarea {
  resize: vertical;
  min-height: 140px;
}

.contact-error {
  font-size: 12px;
  color: var(--color-accent);
  margin: 4px 0 0;
}

.doc-dl {
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--color-text-dim);
  margin: 0 0 10px;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 16px;
}

.doc-dl dt {
  font-family: var(--font-mono);
  color: var(--color-text);
  font-weight: 700;
}

.doc-dl dd {
  margin: 0;
}

/* ---- footer ---- */

.site-footer {
  border-top: 2px solid var(--color-text);
  padding: 20px 20px 30px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  font-size: 12px;
  color: var(--color-text-faint);
  line-height: 1.8;
}

.footer-sub { margin-top: 2px; }

.footer-sep {
  margin: 0 8px;
  color: var(--color-border-strong);
}

/* ---- responsive ---- */

@media (max-width: 900px) {
  .page-layout { flex-direction: column; }
  .main-content { order: 1; }
  .sidebar {
    order: 2;
    width: 100%;
    border-right: none;
    border-top: 1px solid var(--color-border);
    border-bottom: none;
    padding: 20px 0;
    margin-top: 8px;
  }
  .indicator-list,
  .event-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0 20px;
  }
  .usage-steps { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .header-inner {
    padding: 10px 14px;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
  .brand-sub { display: none; }
  .header-right {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .site-nav {
    gap: 12px;
    font-size: 12.5px;
    flex-wrap: wrap;
    row-gap: 4px;
  }
  .lang-switch { gap: 6px; }
  .page-layout { padding: 0 14px; }

  .hero { padding: 20px 0 16px; }
  .hero-title { font-size: 21px; }
  .hero-lead { font-size: 13px; }

  .date-picker-row { gap: 8px; }
  .date-input { flex: 1 1 140px; min-width: 0; }
  .shortcut-row { gap: 5px; }
  .chip { padding: 5px 10px; font-size: 12px; }

  .chart-header { flex-direction: column; align-items: stretch; }
  .chart-header-actions { flex-direction: column; align-items: stretch; gap: 8px; }
  .yield-toggle { width: 100%; }
  .toggle-btn { flex: 1; padding: 6px 4px; font-size: 10.5px; min-width: 0; }
  .toggle-hint { font-size: 8px; white-space: normal; }
  #download-chart-btn { width: 100%; }
  .chart-canvas-wrap { padding: 10px 4px 6px; height: 300px; }

  table.yield-table { font-size: 11.5px; }
  table.yield-table th,
  table.yield-table td { padding: 6px 8px; }

  .usage-step { flex-direction: column; gap: 6px; }
  .usage-step-number { font-size: 16px; }

  .doc-page { padding: 24px 14px 50px; }
  .doc-title { font-size: 19px; }

  .indicator-list,
  .event-list { grid-template-columns: 1fr; }

  .footer-inner { padding: 0; }
}

@media (max-width: 400px) {
  .brand-name { font-size: 17px; }
  .site-nav { font-size: 11.5px; gap: 9px; }
  .lang-btn { font-size: 11.5px; }
  .btn, .btn-primary { padding: 6px 10px; font-size: 12.5px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}