/* DoctorIDD 官网 - 静态样式
   可自由修改配色 / 字体 / 布局 */

:root {
  color-scheme: light;
  --bg: #f8f4ec;
  --bg-deep: #f2ebdc;
  --card-bg: #fffdf9;
  --header-bg: rgba(248, 244, 236, 0.92);
  --accent: #b3232b;
  --accent-hover: #9e1b22;
  --accent-tint: rgba(179, 35, 43, 0.08);
  --accent-glow: rgba(179, 35, 43, 0.3);
  --ink: #2b2b2b;
  --ink-secondary: #6b6b6b;
  --ink-muted: rgba(43, 43, 43, 0.55);
  --line: rgba(43, 43, 43, 0.12);
  --line-strong: rgba(43, 43, 43, 0.22);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-card: 0 12px 32px rgba(43, 43, 43, 0.1);
  --shadow-card-hover: 0 16px 40px rgba(179, 35, 43, 0.14);
  --max-width: 1080px;
  --nav-height: 64px;
  --font-display: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* 暗色模式 */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1b1b1f;
  --bg-deep: #141417;
  --card-bg: #24242b;
  --header-bg: rgba(27, 27, 31, 0.92);
  --accent: #e05a60;
  --accent-hover: #ef7076;
  --accent-tint: rgba(224, 90, 96, 0.12);
  --accent-glow: rgba(224, 90, 96, 0.32);
  --ink: #f0ede6;
  --ink-secondary: #b9b5ad;
  --ink-muted: rgba(240, 237, 230, 0.55);
  --line: rgba(240, 237, 230, 0.12);
  --line-strong: rgba(240, 237, 230, 0.22);
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-card-hover: 0 16px 40px rgba(224, 90, 96, 0.22);
}

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

html {
  scroll-behavior: smooth;
}

/* 锚点定位时避免被吸顶导航遮住 */
section[id],
[id="about"],
[id="announcements"],
[id="members"],
[id="projects"],
[id="rules"],
[id="hero"] {
  scroll-margin-top: calc(var(--nav-height) + 12px);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

::selection {
  background: var(--accent);
  color: #fff;
}

/* 首页交互已回滚为普通滚动：不吸附、不拦截滚轮 */

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

.container {
  width: min(var(--max-width), 92vw);
  margin: 0 auto;
}

.font-mono {
  font-family: var(--font-mono);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-header .site-brand {
  margin-right: auto;
}

.site-brand {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.site-brand .brand-accent {
  color: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav a {
  color: var(--ink-secondary);
  font-size: 0.95rem;
  transition: color 0.2s;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--accent);
}

.theme-toggle,
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--card-bg);
  color: var(--ink);
  font-size: 1.05rem;
  line-height: 1;
  transition: border-color 0.2s, background 0.2s, color 0.2s, transform 0.2s;
}

.theme-toggle:hover,
.nav-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 0;
}

.nav-toggle span {
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  min-height: calc(100vh - var(--nav-height));
  min-height: calc(100svh - var(--nav-height));
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 1rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(179, 35, 43, 0.06), transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(179, 35, 43, 0.06), transparent 40%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.hero__logo {
  width: 120px;
  height: 120px;
  margin: 0 auto 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--card-bg);
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2.5rem;
  color: var(--accent);
  border: 1px solid var(--line);
  overflow: hidden;
}

.hero__logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: inherit;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
}

.hero__slogan {
  color: var(--ink-secondary);
  font-size: clamp(1rem, 3vw, 1.25rem);
  margin-bottom: 2rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 20px var(--accent-glow);
}

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

.btn--ghost {
  background: var(--card-bg);
  border: 1px solid var(--line-strong);
}

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

.hero__hint {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
}

/* ---------- Sections ---------- */
.section {
  padding: 5rem 1rem;
  border-top: 1px solid var(--line);
}

.section-head {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-eyebrow {
  color: var(--ink-secondary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  letter-spacing: 0.04em;
}

.section-desc {
  color: var(--ink-secondary);
  max-width: 40rem;
  margin: 1rem auto 0;
}

/* ---------- Server card / status ---------- */
.section--about {
  background: var(--bg-deep);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: stretch;
}

.about-lead {
  font-size: 1.05rem;
  color: var(--ink-secondary);
}

.about-lead strong {
  color: var(--ink);
}

.about-features {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.about-features li {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.9rem;
  color: var(--ink-secondary);
}

.server-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 1.75rem;
}

.server-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.server-card__label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--ink-secondary);
  text-transform: uppercase;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid var(--line);
  background: var(--card-bg);
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-muted);
}

.status-pill.is-loading .status-dot {
  background: #d97706;
  animation: pulse 1.2s infinite;
}

.status-pill.is-online {
  color: #15803d;
  border-color: rgba(21, 128, 61, 0.3);
  background: rgba(21, 128, 61, 0.06);
}

.status-pill.is-online .status-dot {
  background: #16a34a;
}

.status-pill.is-offline {
  color: #b91c1c;
  border-color: rgba(185, 28, 28, 0.3);
  background: rgba(185, 28, 28, 0.06);
}

.status-pill.is-offline .status-dot {
  background: #dc2626;
}

.status-pill.is-maintenance {
  color: #b45309;
  border-color: rgba(180, 83, 9, 0.3);
  background: rgba(180, 83, 9, 0.06);
}

.status-pill.is-maintenance .status-dot {
  background: #d97706;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.server-meta {
  display: grid;
  gap: 0.75rem;
}

.server-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed var(--line);
}

.server-row dt {
  color: var(--ink-secondary);
}

.server-row dd {
  font-weight: 600;
  text-align: right;
}

.server-row dd.mono {
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.server-players {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.server-players strong {
  font-size: 1.6rem;
  font-family: var(--font-mono);
}

.server-players span {
  color: var(--ink-secondary);
  font-family: var(--font-mono);
}

.server-notice {
  margin-top: 1rem;
  color: var(--ink-secondary);
  font-size: 0.9rem;
  min-height: 1.5em;
}

.refresh-btn {
  margin-top: 1rem;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  background: var(--accent-tint);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: 600;
  transition: background 0.2s, color 0.2s;
}

.refresh-btn:hover {
  background: var(--accent);
  color: #fff;
}

/* ---------- Addresses table ---------- */
.addresses-card {
  margin-top: 1.5rem;
  overflow-x: auto;
}

.addresses-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 480px;
}

.addresses-table th {
  text-align: left;
  color: var(--ink-muted);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.addresses-table td {
  padding: 0.75rem 0.9rem;
  border-bottom: 1px dashed var(--line);
  font-size: 0.95rem;
  vertical-align: middle;
}

.addresses-table tr:last-child td {
  border-bottom: none;
}

.address-ip {
  cursor: pointer;
  user-select: none;
  font-family: var(--font-mono);
  transition: color 0.2s;
}

.address-ip:hover {
  color: var(--accent);
}

.address-ip.copied {
  color: #15803d;
}

.address-source,
.address-node {
  color: var(--ink-secondary);
}

.address-status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
}

.address-status .status-dot {
  width: 8px;
  height: 8px;
}

.address-status.is-online {
  color: #15803d;
}

.address-status.is-online .status-dot {
  background: #16a34a;
}

.address-status.is-offline {
  color: #b91c1c;
}

.address-status.is-offline .status-dot {
  background: #dc2626;
}

.address-status.is-maintenance {
  color: #b45309;
}

.address-status.is-maintenance .status-dot {
  background: #d97706;
}

.address-status.is-loading {
  color: #d97706;
}

.address-status.is-loading .status-dot {
  background: #d97706;
}

/* ---------- Announcements ---------- */
.announcements-list {
  display: grid;
  gap: 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.announcement-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 1.5rem;
}

.announcement-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-bottom: 0.35rem;
}

.announcement-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.announcement-card p {
  color: var(--ink-secondary);
  white-space: pre-line;
}

.announcement-card-images {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.75rem;
}

.announcement-card-images img {
  width: 100%;
  max-width: 180px;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  display: block;
}

.announcement-card a {
  color: #2563eb;
  text-decoration: underline;
  text-underline-offset: 0.18em;
  word-break: break-all;
  transition: color 0.2s;
}

.announcement-card a:hover {
  color: #1d4ed8;
}

.announcement-truncated {
  color: var(--ink-muted);
  font-size: 0.85rem;
}

.announcement-sticky {
  display: inline-block;
  margin-right: 0.5rem;
  padding: 0.05rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-tint);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
}

.announcement-card .announcement-more-link,
.changelog-announcement-summary + .announcement-more-link,
.announcement-changelog-item .announcement-more-link {
  display: inline-block;
  margin-top: 0.8rem;
  color: #2563eb;
  text-decoration: underline;
  text-underline-offset: 0.18em;
  font-weight: 600;
}

.announcement-card .announcement-more-link:hover,
.announcement-changelog-item .announcement-more-link:hover {
  color: #1d4ed8;
}

.changelog-announcement-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 0.2rem 0 0.5rem;
}

.changelog-announcement-summary {
  color: var(--ink-secondary);
  white-space: pre-line;
}

.announcement-detail-head h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  word-break: break-word;
}

.announcement-detail-date {
  color: var(--ink-muted);
  margin-top: 0.5rem;
}

.announcement-detail #announcement-detail-content {
  color: var(--ink-secondary);
  white-space: pre-line;
}

.announcement-detail #announcement-detail-content a {
  color: #2563eb;
  text-decoration: underline;
  text-underline-offset: 0.18em;
  word-break: break-all;
}

.announcement-detail-images {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.announcement-image {
  margin: 0;
}

.announcement-image img {
  width: 100%;
  max-width: 780px;
  height: auto;
  margin: 0 auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  display: block;
}

.announcement-image figcaption {
  color: var(--ink-muted);
  font-size: 0.85rem;
  text-align: center;
  margin-top: 0.4rem;
}

.announcements-more {
  text-align: center;
  margin-top: 2rem;
}

/* ---------- Changelog ---------- */
.changelog-item {
  padding: 1.25rem 0;
  border-bottom: 1px dashed var(--line);
}

.changelog-item:last-child {
  border-bottom: none;
}

.changelog-head {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.changelog-version {
  color: var(--accent);
  font-weight: 700;
}

.changelog-date {
  color: var(--ink-muted);
  font-size: 0.85rem;
}

.changelog-changes {
  list-style: none;
  display: grid;
  gap: 0.4rem;
  color: var(--ink-secondary);
}

.changelog-changes li::before {
  content: "· ";
  color: var(--accent);
  font-weight: 700;
}

/* ---------- Members ---------- */
.members-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
}

.member-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 1.25rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s, box-shadow 0.2s;
}

.member-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.member-avatar {
  width: 64px;
  height: 64px;
  margin: 0 auto 0.75rem;
  border-radius: 12px;
  image-rendering: pixelated;
  background: var(--bg-deep);
}

.member-name {
  font-weight: 700;
  word-break: break-word;
}

.member-tier {
  display: inline-block;
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.1rem 0.55rem;
}

.member-role {
  margin-top: 0.35rem;
  color: var(--ink-muted);
  font-size: 0.85rem;
}

/* ---------- Projects ---------- */
.projects-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.project-card {
  display: block;
  flex: 0 1 300px;
  min-width: 240px;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--accent);
}

.project-card__top {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}

.project-card__icon {
  font-size: 1.4rem;
}

.project-card__name {
  font-weight: 700;
}

.project-card__author {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-secondary);
}

.project-card__desc {
  color: var(--ink-secondary);
  font-size: 0.92rem;
}

/* ---------- Rules ---------- */
.rules-summary {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: center;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
}

.rules-summary h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.rules-summary p {
  color: var(--ink-secondary);
}

/* Rules page */
.rules-page {
  padding: 3rem 1rem 5rem;
}

.rules-nav {
  margin-bottom: 2rem;
}

.rules-nav__back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink-secondary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.rules-nav__back:hover {
  color: var(--accent);
}

.rules-head {
  text-align: center;
  margin-bottom: 2.5rem;
}

.rules-head h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
}

.rules-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2rem;
  align-items: start;
}

.rules-block {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 1.75rem;
}

.rules-block + .rules-block {
  margin-top: 1.5rem;
}

.rules-block h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.rules-list {
  list-style: none;
  counter-reset: rule;
}

.rule-item {
  display: flex;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px dashed var(--line);
}

.rule-item:last-child {
  border-bottom: none;
}

.rule-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  color: var(--accent);
  min-width: 2.5rem;
}

.steps {
  list-style: none;
  display: grid;
  gap: 1rem;
}

.step {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
}

.step__idx {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 700;
}

.step__name {
  font-weight: 700;
}

.step__note {
  display: block;
  color: var(--ink-secondary);
  font-size: 0.9rem;
}

.notes {
  list-style: none;
  display: grid;
  gap: 0.6rem;
}

.notes li {
  background: var(--accent-tint);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 0.6rem 0.9rem;
  font-size: 0.92rem;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--line);
  padding: 3rem 1rem 2rem;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
}

.site-footer__logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
}

.site-footer__tagline {
  color: var(--ink-secondary);
  margin-top: 0.5rem;
}

.site-footer__head {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  margin-bottom: 0.75rem;
}

.site-footer__col {
  display: grid;
  gap: 0.45rem;
}

#footer-community {
  display: grid;
  gap: 0.45rem;
}

.site-footer__col a,
.site-footer__col span {
  color: var(--ink-secondary);
  font-size: 0.92rem;
}

.site-footer__col a:hover {
  color: var(--accent);
}

.site-footer__bar {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--ink-muted);
  font-size: 0.85rem;
}

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 1.75rem);
  bottom: clamp(1rem, 3vw, 1.75rem);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card-bg);
  border: 1px solid var(--line-strong);
  color: var(--accent);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition:
    opacity 0.35s ease,
    transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
    visibility 0.35s,
    background 0.25s,
    border-color 0.25s,
    color 0.25s;
  z-index: 100;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 24px var(--accent-glow);
}

.back-to-top svg {
  display: block;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: var(--nav-height);
    right: 0;
    bottom: 0;
    width: min(78vw, 320px);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--card-bg);
    border-left: 1px solid var(--line);
    box-shadow: var(--shadow-card);
    padding: 1rem 1.5rem;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.3s ease, visibility 0.3s;
    z-index: 60;
  }

  .site-nav.is-open {
    transform: translateX(0);
    visibility: visible;
  }

  .site-nav a {
    display: block;
    width: 100%;
    padding: 0.8rem 0;
    font-size: 1rem;
    border-bottom: 1px dashed var(--line);
  }

  body.nav-open {
    overflow: hidden;
  }

  body.nav-open::after {
    content: "";
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 55;
  }

  .about-grid,
  .rules-layout {
    grid-template-columns: 1fr;
  }

  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 560px) {
  .rules-summary {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
  }
}

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

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