:root {
  color-scheme: dark;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  background: #090f14;
  color: #edf4f5;
  font-synthesis: none;

  --bg: #090f14;
  --panel: rgba(14, 22, 28, 0.92);
  --line: #28363b;
  --ink: #edf4f5;
  --ink-soft: #b9c8cb;
  --ink-faint: #91a2a6;
  --gold: #ecc86e;
  --cyan: #91d8e8;
  --hinomoto: #ecc86e;
  --kouka: #ff7264;
  --nanrei: #5bc8e8;
  --cut: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    linear-gradient(rgba(145, 216, 232, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(145, 216, 232, 0.03) 1px, transparent 1px),
    radial-gradient(circle at 15% 0%, rgba(179, 43, 42, 0.17), transparent 34rem),
    radial-gradient(circle at 90% 12%, rgba(34, 116, 151, 0.18), transparent 30rem),
    #090f14;
  background-size: 48px 48px, 48px 48px, auto, auto, auto;
  line-height: 1.75;
}

main {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 80px;
}

a {
  color: #91d8e8;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 100;
  padding: 8px 14px;
  background: var(--gold);
  color: #1a1405;
  font-weight: 750;
  text-decoration: none;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 12px;
}

/* ── ヘッダー ─────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(9, 15, 20, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.site-header .inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  padding: 12px 0;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  white-space: nowrap;
}

.brand .alpha-tag {
  padding: 1px 8px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--cyan);
}

.site-nav a.nav-cta {
  padding: 5px 14px;
  border: 1px solid var(--gold);
  color: var(--gold);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

.site-nav a.nav-cta:hover {
  background: rgba(236, 200, 110, 0.12);
  color: var(--gold);
}

/* ── ヒーロー ─────────────────────────────── */

.hero {
  position: relative;
  overflow: hidden;
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--line);
}

.hero .inner {
  position: relative;
  z-index: 1;
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
}

.hero-art {
  position: absolute;
  inset: auto 0 0 0;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  pointer-events: none;
}

.hero .eyebrow {
  font-size: 0.82rem;
}

.hero h1 {
  max-width: 22ch;
}

.tagline {
  max-width: 44rem;
  margin: 18px 0 10px;
  color: var(--ink-soft);
  font-size: 1.06rem;
  line-height: 2;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  border: 1px solid var(--line);
  color: var(--ink);
  font-weight: 750;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  background: rgba(14, 22, 28, 0.7);
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}

.btn-primary {
  border-color: var(--gold);
  background: linear-gradient(180deg, rgba(236, 200, 110, 0.22), rgba(236, 200, 110, 0.08));
  color: var(--gold);
}

.btn-primary:hover {
  background: rgba(236, 200, 110, 0.28);
}

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

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  color: var(--ink-faint);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
}

.hero-facts li::before {
  content: "▸ ";
  color: var(--gold);
}

/* ── 汎用 ─────────────────────────────── */

.eyebrow {
  margin: 0 0 10px;
  color: #ecc86e;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.4rem);
  letter-spacing: -0.04em;
}

h2 {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  letter-spacing: -0.02em;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.12rem;
}

.lead {
  max-width: 48rem;
  margin: 14px 0 32px;
  color: #b9c8cb;
  line-height: 1.8;
}

section {
  margin-top: 72px;
}

section:first-child {
  margin-top: 0;
}

.section-head {
  margin-bottom: 26px;
}

.section-head p {
  max-width: 46rem;
  margin: 12px 0 0;
  color: var(--ink-soft);
}

.panel {
  padding: 24px 26px;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.notice {
  margin: 0 0 32px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  background: var(--panel);
  color: var(--ink-soft);
  line-height: 1.8;
}

.notice strong {
  color: var(--gold);
}

/* ── 陣営カード ─────────────────────────────── */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.faction-card {
  --accent: var(--gold);
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.faction-card .code {
  margin: 0;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.22em;
}

.faction-card h3 {
  margin: 0;
  font-size: 1.3rem;
}

.faction-card blockquote {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--accent);
  color: var(--ink);
  font-weight: 650;
  font-style: normal;
  line-height: 1.7;
}

.faction-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.85;
}

.faction-card .emblem {
  width: 44px;
  height: 44px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: auto 0 0;
  padding: 10px 0 0;
  list-style: none;
}

.chips li {
  padding: 2px 10px;
  border: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
}

/* ── 手順・表 ─────────────────────────────── */

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 10px;
}

.steps li {
  counter-increment: step;
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 14px 18px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink-soft);
}

.steps li::before {
  content: counter(step, decimal-leading-zero);
  flex: none;
  color: var(--gold);
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

table.controls {
  width: 100%;
  border: 1px solid var(--line);
  border-collapse: collapse;
  background: var(--panel);
  font-size: 0.94rem;
}

table.controls caption {
  padding: 0 0 12px;
  color: var(--ink-faint);
  font-size: 0.84rem;
  text-align: left;
}

table.controls th,
table.controls td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

table.controls th[scope="col"] {
  background: rgba(255, 255, 255, 0.025);
  color: var(--gold);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

table.controls th[scope="row"] {
  width: 15rem;
  color: var(--ink);
  font-weight: 650;
  white-space: nowrap;
}

table.controls td {
  color: var(--ink-soft);
}

table.controls tr:last-child th,
table.controls tr:last-child td {
  border-bottom: 0;
}

kbd {
  padding: 1px 7px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.85em;
}

/* ── ダウンロード ─────────────────────────────── */

.download-panel {
  display: grid;
  gap: 20px;
}

.meta-list {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 8px 24px;
  margin: 0;
}

.meta-list dt {
  color: var(--ink-faint);
  font-size: 0.84rem;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.meta-list dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.hash-block {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  background: rgba(5, 9, 12, 0.9);
}

.hash-block code {
  flex: 1 1 20rem;
  overflow-wrap: anywhere;
  color: var(--cyan);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.8rem;
  line-height: 1.6;
}

pre.cmd {
  margin: 0;
  padding: 12px 16px;
  border: 1px solid var(--line);
  background: rgba(5, 9, 12, 0.9);
  overflow-x: auto;
}

pre.cmd code {
  color: var(--ink-soft);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.82rem;
}

.doc > pre {
  overflow-x: auto;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0a1119;
  color: #cbd8e3;
  font-size: 0.76rem;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.copy-btn {
  display: none;
  align-items: center;
  padding: 6px 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 650;
  cursor: pointer;
}

.js .copy-btn {
  display: inline-flex;
}

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

.copy-btn[data-copied="true"] {
  border-color: var(--gold);
  color: var(--gold);
}

/* ── リスト・FAQ ─────────────────────────────── */

.limit-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.limit-list li {
  padding: 12px 18px 12px 38px;
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.limit-list li::before {
  content: "!";
  position: absolute;
  left: 14px;
  top: 12px;
  color: var(--gold);
  font-weight: 800;
}

.faq details {
  border: 1px solid var(--line);
  background: var(--panel);
  margin-bottom: 10px;
}

.faq summary {
  padding: 14px 18px;
  color: var(--ink);
  font-weight: 650;
  cursor: pointer;
}

.faq summary:hover {
  color: var(--cyan);
}

.faq details > div {
  padding: 0 18px 16px;
  color: var(--ink-soft);
  font-size: 0.94rem;
}

/* ── 記事ページ（マニュアル・規約） ─────────────── */

.doc h2 {
  margin-top: 56px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.doc h3 {
  margin-top: 32px;
}

.doc p,
.doc li {
  color: var(--ink-soft);
}

.doc ul,
.doc ol {
  padding-left: 1.4em;
}

.toc {
  padding: 18px 22px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.toc p {
  margin: 0 0 8px;
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.toc ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}

/* ── リリースノート ─────────────────────────── */

.release-entry {
  margin-top: 28px;
  padding: 24px 26px;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.release-entry.release-current {
  border-top: 3px solid var(--gold);
}

.release-entry h2,
.release-entry h3 {
  margin-top: 0;
}

.release-entry .btn {
  margin-top: 8px;
}

.release-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.release-heading time {
  color: var(--ink-faint);
  font-size: 0.86rem;
  white-space: nowrap;
}

/* ── 特商法テーブル（既存） ─────────────────────── */

.legal-table {
  overflow: hidden;
  border: 1px solid #28363b;
  border-radius: 16px;
  background: rgba(14, 22, 28, 0.92);
}

.legal-row {
  display: grid;
  grid-template-columns: minmax(10rem, 14rem) 1fr;
  border-bottom: 1px solid #28363b;
}

.legal-row:last-child {
  border-bottom: 0;
}

.legal-row dt,
.legal-row dd {
  margin: 0;
  padding: 18px 20px;
  line-height: 1.75;
}

.legal-row dt {
  background: rgba(255, 255, 255, 0.025);
  color: #d7e3e5;
  font-weight: 750;
}

.legal-row dd {
  color: #b9c8cb;
}

.footnote {
  margin-top: 28px;
  color: #91a2a6;
  font-size: 0.88rem;
  line-height: 1.8;
}

/* ── フッター ─────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(5, 9, 12, 0.8);
}

.site-footer .inner {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 36px 0 44px;
}

.site-footer .brand-line {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.site-footer nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer nav a {
  color: var(--ink-soft);
  font-size: 0.88rem;
}

/* ── 404 ─────────────────────────────── */

.error-page {
  min-height: 60vh;
  display: grid;
  place-content: center;
  text-align: center;
}

.error-page .code404 {
  margin: 0;
  color: var(--gold);
  font-size: clamp(4rem, 14vw, 7rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1;
}

/* ── アカウント・管理ページ ─────────────── */

.hidden {
  display: none !important;
}

.account-panel {
  display: grid;
  gap: 18px;
}

.msg {
  margin: 0 0 18px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 0.94rem;
  line-height: 1.8;
}

.msg-error {
  border-left: 3px solid var(--kouka);
  color: #ffb4ac;
}

.msg-info {
  border-left: 3px solid var(--nanrei);
  color: #b7e3f0;
}

.notice-test {
  border-left-color: var(--nanrei);
}

.notice-test strong {
  color: var(--nanrei);
}

.account-panel code {
  overflow-wrap: anywhere;
  color: var(--cyan);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.85em;
}

.admin-form {
  display: grid;
  gap: 10px;
}

.admin-form label {
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 650;
}

.admin-form fieldset {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 14px 16px;
  border: 1px solid var(--line);
}

.admin-form legend {
  padding: 0 6px;
  color: var(--gold);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.admin-form input[type="text"],
.admin-form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: rgba(5, 9, 12, 0.9);
  color: var(--ink);
  font: inherit;
}

.admin-form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.admin-form-row input {
  flex: 1 1 16rem;
}

.confirm-box {
  padding: 16px 18px;
  border: 1px solid var(--gold);
  background: rgba(236, 200, 110, 0.08);
}

.confirm-box h3 {
  margin: 0 0 8px;
  color: var(--gold);
}

.btn-small {
  padding: 4px 12px;
  font-size: 0.8rem;
}

.table-scroll {
  overflow-x: auto;
}

.admin-table th[scope="row"],
.admin-table td {
  white-space: normal;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── レスポンシブ・アクセシビリティ ─────────────── */

@media (max-width: 860px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  main {
    padding-top: 32px;
  }

  .hero {
    padding-top: 48px;
  }

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

  .legal-row dt {
    padding-bottom: 6px;
  }

  .legal-row dd {
    padding-top: 6px;
  }

  .meta-list {
    grid-template-columns: 1fr;
    gap: 2px 0;
  }

  .meta-list dd {
    margin-bottom: 10px;
  }

  table.controls th[scope="row"] {
    width: auto;
    white-space: normal;
  }
}

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