/* かなRoma */

:root {
  --ink: #142033;
  --ink-soft: #3d4a63;
  --muted: #6b778f;
  --line: rgba(20, 32, 51, 0.1);
  --paper: #f4f1eb;
  --card: rgba(255, 255, 255, 0.78);
  --card-solid: #fffcf8;
  --accent: #c24b2a;
  --accent-2: #1f5c8a;
  --accent-deep: #0f3a5c;
  --hebon: #1f5c8a;
  --kunrei: #2f7a4b;
  --mode-tint: 31, 92, 138;
  --mode-soft: 194, 75, 42;
  --shadow: 0 20px 50px rgba(20, 32, 51, 0.08), 0 2px 8px rgba(20, 32, 51, 0.04);
  --radius: 20px;
  --font: "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  --display: "Outfit", "Noto Sans JP", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(31, 92, 138, 0.12), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(194, 75, 42, 0.1), transparent 50%),
    linear-gradient(180deg, #f7f4ee 0%, var(--paper) 40%, #efe9df 100%);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body.mode-kunrei {
  --accent: var(--kunrei);
  --accent-2: var(--kunrei);
  --accent-deep: #1f5a38;
  --mode-tint: 47, 122, 75;
  --mode-soft: 47, 122, 75;
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(40px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
}

.bg-orb-a {
  width: 340px;
  height: 340px;
  top: 12%;
  left: -80px;
  background: rgba(var(--mode-tint), 0.18);
}

.bg-orb-b {
  width: 280px;
  height: 280px;
  right: -60px;
  bottom: 18%;
  background: rgba(var(--mode-soft), 0.14);
}

.shell {
  position: relative;
  z-index: 1;
  width: min(1040px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.25rem 0 3rem;
}

/* Header */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.25rem;
  color: #fff;
  background: linear-gradient(145deg, var(--accent-2), var(--accent-deep));
  box-shadow: 0 10px 24px rgba(var(--mode-tint), 0.28);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-text span {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.nav {
  display: flex;
  gap: 0.35rem;
}

.nav a,
.nav-current {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  transition: background 0.2s, color 0.2s;
}

.nav a:hover {
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink);
}

.nav-current {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 1px 4px rgba(20, 32, 51, 0.06);
  cursor: default;
}

/* Hero */

.hero {
  text-align: center;
  margin-bottom: 2rem;
}

.eyebrow {
  display: inline-flex;
  margin: 0 0 0.85rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-2);
  background: rgba(var(--mode-tint), 0.08);
  border: 1px solid rgba(var(--mode-tint), 0.12);
}

.hero h1 {
  margin: 0 0 0.85rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4.5vw, 2.85rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  margin: 0 auto;
  max-width: 34rem;
  color: var(--ink-soft);
  font-size: 1rem;
}

/* Converter card */

.converter {
  background: var(--card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  padding: 1.15rem;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  margin-bottom: 1rem;
}

/* 下段(通常/camel…)の自然幅に、上段(ヘボン/訓令)を揃える */
.seg-stack {
  display: inline-flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.55rem;
  width: max-content;
  max-width: 100%;
}

.seg {
  display: flex;
  padding: 4px;
  border-radius: 14px;
  background: rgba(20, 32, 51, 0.06);
  gap: 4px;
  box-sizing: border-box;
}

.seg-btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  font-family: inherit;
  background: transparent;
  color: var(--muted);
  border-radius: 11px;
  padding: 0.55rem 1rem;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1rem;
  font-weight: 600;
  font-size: 0.92rem;
  transition: all 0.2s ease;
}

.seg-btn small {
  font-size: 0.68rem;
  font-weight: 500;
  opacity: 0.75;
  letter-spacing: 0.03em;
}

.seg-btn.is-active {
  background: #fff;
  color: var(--ink);
  box-shadow: 0 4px 14px rgba(20, 32, 51, 0.1);
}

.seg-btn.is-active[data-mode="hebon"] {
  color: var(--hebon);
}

.seg-btn.is-active[data-mode="kunrei"] {
  color: var(--kunrei);
}

/* 上段: 下段と同じ横幅いっぱいに2等分 */
.seg-mode .seg-btn {
  flex: 1 1 0;
  min-width: 0;
  width: auto;
}

/* 下段: ラベル幅ベース → スタック全体の幅を決める */
.seg-style .seg-btn {
  flex: 0 0 auto;
  width: auto;
  min-width: 0;
  flex-direction: row;
  padding: 0.5rem 0.85rem;
  font-size: 0.82rem;
  font-family: var(--mono);
  font-weight: 500;
  white-space: nowrap;
}

.seg-style .seg-btn[data-style="plain"] {
  font-family: inherit;
  font-weight: 600;
}

.seg-style .seg-btn.is-active {
  color: var(--accent-2);
}

body.style-ident .seg-style .seg-btn.is-active {
  color: var(--accent);
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.case-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-soft);
  cursor: pointer;
  user-select: none;
}

.case-toggle input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.switch {
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: rgba(20, 32, 51, 0.15);
  position: relative;
  transition: background 0.2s;
}

.switch::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s;
}

.case-toggle input:checked + .switch {
  background: var(--accent-2);
}

.case-toggle input:checked + .switch::after {
  transform: translateX(18px);
}

.ghost-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.65);
  color: var(--ink-soft);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.ghost-btn:hover {
  color: var(--ink);
  border-color: rgba(20, 32, 51, 0.2);
  background: #fff;
}

.ghost-btn.is-copied {
  color: var(--kunrei);
  border-color: rgba(47, 122, 75, 0.3);
  background: rgba(47, 122, 75, 0.08);
}

.panels {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.75rem;
  align-items: stretch;
}

.panel {
  min-width: 0;
  background: var(--card-solid);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-out {
  background: linear-gradient(180deg, #fff 0%, #f8fafc 100%);
}

body.mode-kunrei .panel-out {
  background: linear-gradient(180deg, #fff 0%, #f5faf7 100%);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.75rem 1rem 0.35rem;
}

.panel-head label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.hint {
  font-size: 0.75rem;
  color: var(--muted);
}

.panel textarea {
  width: 100%;
  min-height: 240px;
  border: 0;
  resize: vertical;
  padding: 0.4rem 1rem 1rem;
  font-family: var(--mono);
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--ink);
  background: transparent;
  outline: none;
}

.panel-out textarea {
  color: var(--accent-2);
  font-weight: 500;
}

.panel-divider {
  display: grid;
  place-items: center;
  padding-top: 2.5rem;
}

.arrow-pill {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(145deg, var(--accent-2), var(--accent));
  box-shadow: 0 8px 18px rgba(var(--mode-tint), 0.25);
}

.status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 0.85rem;
  padding: 0 0.35rem;
}

.mode-note,
.char-count {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.mode-note {
  font-weight: 500;
}

/* Features */

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.75rem 0;
}

.feature {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 18px;
  padding: 1.15rem 1.2rem;
}

.feature-icon {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 9px;
  font-family: var(--display);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-2);
  background: rgba(var(--mode-tint), 0.1);
  margin-bottom: 0.65rem;
}

.feature h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.feature p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

/* About */

.about {
  margin-top: 0.5rem;
}

.about-card {
  border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
  background: rgba(20, 32, 51, 0.92);
  color: #e8edf5;
  box-shadow: var(--shadow);
}

.about-card h2 {
  margin: 0 0 1rem;
  font-family: var(--display);
  font-size: 1.25rem;
}

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.compare h3 {
  margin: 0 0 0.4rem;
  font-size: 0.95rem;
  color: #fff;
}

.compare p {
  margin: 0;
  font-size: 0.88rem;
  color: rgba(232, 237, 245, 0.78);
}

.compare code {
  display: inline-block;
  margin: 0.15rem 0.15rem 0 0;
  padding: 0.1rem 0.4rem;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.08);
  color: #9fd0ff;
}

body.mode-kunrei .compare code {
  color: #9fe0b8;
}

.disclaimer {
  margin: 0 0 0.85rem;
  font-size: 0.8rem;
  color: rgba(232, 237, 245, 0.55);
}

.text-link {
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
}

.text-link:hover {
  border-bottom-color: #fff;
}

/* Width page */

.hero-compact {
  margin-bottom: 1.5rem;
}

.toolbar-label {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.type-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: -0.25rem 0 1rem;
}

.type-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--ink-soft);
  cursor: pointer;
  user-select: none;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.type-chip input {
  width: 0.95rem;
  height: 0.95rem;
  margin: 0;
  accent-color: var(--accent-2);
  cursor: pointer;
}

.type-chip:has(input:checked) {
  color: var(--accent-2);
  border-color: rgba(var(--mode-tint), 0.28);
  background: rgba(var(--mode-tint), 0.08);
}

.panel-solo {
  margin-bottom: 0.85rem;
}

.panel-solo textarea {
  min-height: 140px;
}

.width-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.panel-half textarea {
  color: var(--accent);
}

/* Rules page */

.page-title {
  margin: 0 0 0.4rem;
  font-family: var(--display);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  letter-spacing: -0.02em;
}

.page-sub {
  margin: 0 0 1.5rem;
  color: var(--ink-soft);
}

.rules-wrap {
  display: grid;
  gap: 1.25rem;
}

.rule-card {
  background: var(--card);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  overflow-x: auto;
}

.rule-card h2 {
  margin: 0 0 0.85rem;
  font-size: 1.05rem;
}

.rule-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 520px;
}

.rule-table th,
.rule-table td {
  border: 1px solid var(--line);
  padding: 0.45rem 0.55rem;
  text-align: center;
}

.rule-table th {
  background: rgba(20, 32, 51, 0.04);
  font-weight: 600;
  color: var(--ink-soft);
}

.rule-table td:nth-child(odd) {
  font-weight: 600;
}

.rule-table td:nth-child(even) {
  font-family: var(--mono);
  color: var(--accent-2);
  font-size: 0.82rem;
}

.note-list {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.note-list li {
  margin-bottom: 0.4rem;
}

.back-link {
  margin: 1.5rem 0 0;
}

.text-link-dark {
  color: var(--accent-2);
  border-bottom-color: rgba(31, 92, 138, 0.35);
}

.text-link-dark:hover {
  border-bottom-color: var(--accent-2);
}

/* Responsive */

@media (max-width: 820px) {
  .panels {
    grid-template-columns: 1fr;
  }

  .panel-divider {
    padding: 0;
    transform: rotate(90deg);
  }

  .features,
  .compare,
  .width-results {
    grid-template-columns: 1fr;
  }

  .panel textarea {
    min-height: 180px;
  }

  .panel-solo textarea {
    min-height: 120px;
  }
}

@media (max-width: 520px) {
  .shell {
    width: calc(100% - 1.25rem);
  }

  .topbar {
    margin-bottom: 1.5rem;
  }

  .seg-style {
    flex-wrap: wrap;
  }

  .seg-style .seg-btn {
    padding: 0.45rem 0.65rem;
    font-size: 0.78rem;
  }

  .toolbar-right {
    width: 100%;
    justify-content: space-between;
  }
}