:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5b6679;
  --paper: #ffffff;
  --bg: #f5f3ee;
  --line: #dce2ea;
  --blue: #0878b8;
  --blue-deep: #075982;
  --coral: #d94f41;
  --green: #147554;
  --yellow: #a96b00;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 10% 7%, rgba(8, 120, 184, 0.08), transparent 26rem),
    radial-gradient(circle at 90% 19%, rgba(217, 79, 65, 0.06), transparent 24rem),
    var(--bg);
  color: var(--ink);
  font-family: Inter, "Noto Sans JP", "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif;
  line-height: 1.8;
}

a {
  color: inherit;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

.header-inner,
.site-footer-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.wordmark {
  text-decoration: none;
  font-family: "Arial Black", Impact, sans-serif;
  font-size: 21px;
  letter-spacing: 0.05em;
}

.wordmark span {
  color: var(--coral);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.header-nav a {
  text-decoration: none;
}

.header-nav a:hover {
  color: var(--ink);
}

.header-play {
  border: 1px solid rgba(217, 79, 65, 0.36);
  border-radius: 8px;
  padding: 8px 14px;
  background: rgba(217, 79, 65, 0.08);
  color: #a3332a !important;
}

.tool-hero {
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 74px 0 62px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.16em;
}

h1,
h2,
h3 {
  line-height: 1.35;
}

h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(34px, 5.4vw, 64px);
  letter-spacing: -0.045em;
}

.hero-lead {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(16px, 2vw, 19px);
}

.tool-main {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 52px 0 94px;
}

.tool-panel,
.content-panel,
.tool-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 16px 50px rgba(34, 47, 68, 0.08);
}

.tool-panel {
  padding: clamp(22px, 4vw, 42px);
}

.tool-panel h2,
.content-panel h2 {
  margin-top: 0;
}

.tool-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.primary-button,
.secondary-button {
  min-height: 48px;
  border-radius: 9px;
  padding: 0 22px;
  cursor: pointer;
  font-weight: 900;
}

.primary-button {
  border: 0;
  background: var(--coral);
  box-shadow: 0 5px 0 #a94438;
  color: #fff;
}

.primary-button:hover {
  transform: translateY(1px);
  box-shadow: 0 4px 0 #a94438;
}

.secondary-button {
  border: 1px solid #bcc8d7;
  background: #fff;
  color: var(--ink);
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.field {
  display: grid;
  gap: 7px;
}

.field label,
.field > span {
  font-size: 13px;
  font-weight: 900;
}

.field input,
.field select,
.search-input {
  width: 100%;
  min-height: 48px;
  border: 1px solid #bcc8d7;
  border-radius: 9px;
  padding: 10px 13px;
  background: #fff;
  color: var(--ink);
}

.field input:focus,
.field select:focus,
.search-input:focus {
  border-color: var(--blue);
  outline: 3px solid rgba(8, 120, 184, 0.14);
}

.result-box {
  margin-top: 24px;
  border: 1px solid #cbd7e3;
  border-radius: 13px;
  padding: 22px;
  background: linear-gradient(135deg, #eef8fd, #fff8f4);
}

.result-box[hidden] {
  display: none;
}

.result-number {
  display: block;
  color: var(--blue-deep);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 900;
  line-height: 1.15;
}

.result-label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 18px;
}

.metric {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 13px;
  background: #fff;
}

.metric strong {
  display: block;
  font-size: 23px;
}

.metric span {
  color: var(--muted);
  font-size: 12px;
}

.typing-stage {
  border: 1px solid #cbd7e3;
  border-radius: 14px;
  padding: clamp(20px, 4vw, 34px);
  background: #f9fbfd;
}

.typing-status {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.typing-status strong {
  color: var(--ink);
  font-size: 18px;
}

.typing-japanese {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 900;
}

.typing-roman {
  min-height: 74px;
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: clamp(19px, 3vw, 28px);
  letter-spacing: 0.04em;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.typing-roman .done {
  color: var(--green);
}

.typing-roman .current {
  border-bottom: 3px solid var(--coral);
  color: var(--coral);
}

.typing-roman .rest {
  color: #98a3b4;
}

.typing-message {
  min-height: 1.8em;
  margin: 16px 0 0;
  color: var(--blue-deep);
  font-weight: 800;
}

.practice-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.practice-heading h2 {
  margin-bottom: 0;
}

.practice-selection {
  display: grid;
  min-width: 150px;
  margin: 0;
  text-align: right;
}

.practice-selection strong {
  color: var(--coral);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 42px;
  line-height: 1;
}

.practice-selection span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.practice-keyboard {
  display: grid;
  gap: 8px;
  margin: 24px 0 0;
}

.practice-key-row {
  display: flex;
  justify-content: center;
  gap: 8px;
}

.practice-key {
  width: clamp(30px, 7vw, 56px);
  aspect-ratio: 1;
  border: 1px solid #b8c4d2;
  border-radius: 9px;
  background: #fff;
  box-shadow: 0 3px 0 #cbd3dd;
  color: var(--ink);
  cursor: pointer;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: clamp(13px, 2vw, 18px);
  font-weight: 900;
}

.practice-key:hover:not(:disabled) {
  border-color: var(--blue);
  color: var(--blue-deep);
  transform: translateY(1px);
}

.practice-key.is-selected {
  border-color: var(--coral);
  background: var(--coral);
  box-shadow: 0 3px 0 #a94438;
  color: #fff;
}

.practice-key:disabled {
  background: #eef1f4;
  box-shadow: none;
  color: #a7afba;
  cursor: not-allowed;
}

.practice-divider {
  height: 1px;
  margin: 34px 0;
  background: var(--line);
}

.practice-example-label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.practice-example {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 18px;
  letter-spacing: 0.04em;
}

.practice-example mark {
  border-radius: 4px;
  padding: 1px 3px;
  background: #ffe2d9;
  color: #a3332a;
  font-weight: 900;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.breadcrumb a {
  color: var(--blue-deep);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.tool-card {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  padding: 26px;
}

.tool-card .tag {
  color: var(--yellow);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.14em;
}

.tool-card h2 {
  margin: 10px 0;
  font-size: 24px;
}

.tool-card p {
  margin: 0 0 20px;
  color: var(--muted);
}

.tool-card a {
  margin-top: auto;
  color: var(--blue-deep);
  font-weight: 900;
  text-decoration: none;
}

.content-panel {
  margin-top: 28px;
  padding: clamp(24px, 4vw, 44px);
}

.content-panel h2 {
  margin-top: 46px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: clamp(24px, 3vw, 32px);
}

.content-panel h2:first-child {
  margin-top: 0;
}

.content-panel h3 {
  margin: 30px 0 10px;
}

.content-panel p,
.content-panel li {
  color: #3f4b60;
}

.content-panel a {
  color: var(--blue-deep);
  text-underline-offset: 3px;
}

.table-wrap {
  margin: 24px 0;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 13px 14px;
  text-align: left;
}

th {
  background: #edf6fb;
}

.romaji-table tbody tr[hidden] {
  display: none;
}

.note {
  margin: 22px 0;
  border-left: 4px solid var(--blue);
  border-radius: 8px;
  padding: 17px 20px;
  background: #eef7fb;
}

.cta {
  margin-top: 30px;
  border: 1px solid rgba(217, 79, 65, 0.25);
  border-radius: 14px;
  padding: 28px;
  background: linear-gradient(135deg, rgba(217, 79, 65, 0.07), rgba(8, 120, 184, 0.06));
  text-align: center;
}

.cta h2 {
  margin: 0 0 8px;
  padding: 0;
  border: 0;
}

.cta p {
  margin: 0 0 18px;
}

.cta a {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 0 24px;
  background: var(--coral);
  box-shadow: 0 5px 0 #a94438;
  color: #fff;
  font-weight: 900;
  text-decoration: none;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #eceff3;
}

.site-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 30px 0;
  color: #667286;
  font-size: 12px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-links a {
  text-decoration: none;
}

@media (max-width: 760px) {
  .header-nav a:not(.header-play) {
    display: none;
  }

  .field-grid,
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .metric-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .practice-heading {
    align-items: start;
  }

  .practice-keyboard {
    gap: 5px;
  }

  .practice-key-row {
    gap: 4px;
  }

  .site-footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .header-inner,
  .site-footer-inner,
  .hero-inner,
  .tool-main {
    width: calc(100% - 28px);
  }

  .header-inner {
    min-height: 60px;
  }

  .wordmark {
    font-size: 18px;
  }

  .hero-inner {
    padding: 52px 0 42px;
  }

  .tool-main {
    padding-top: 30px;
  }

  th,
  td {
    min-width: 120px;
  }
}

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

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