:root {
  --ebony: #141311;
  --ivory: #f3ead8;
  --ivory-2: #e7d7bc;
  --brass: #b0893e;
  --felt: #7a2433;
  --ink: #1c1814;
  --mute: #6e6458;
  --line: rgba(28, 24, 20, 0.14);
  --serif: "Noto Serif SC", "Cormorant Garamond", serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

section[id] {
  scroll-margin-top: 70px;
}

body {
  margin: 0;
  background: var(--ivory);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
}

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

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

a[href^="https://apps.chatsoftware.cn"] {
  color: var(--felt);
  text-decoration: underline;
  text-underline-offset: 3px;
}

button {
  font-family: inherit;
  cursor: pointer;
}

code {
  font-family: ui-monospace, Menlo, monospace;
  font-size: 0.9em;
}

.felt {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 40;
  opacity: 0.07;
  background-image: url("images/texture.webp");
  background-size: 480px;
  mix-blend-mode: multiply;
}

.keys {
  position: sticky;
  top: 0;
  z-index: 31;
  height: 10px;
  background: repeating-linear-gradient(
    90deg,
    var(--ivory) 0 10px,
    var(--ebony) 10px 14px,
    var(--ivory) 14px 24px,
    var(--ebony) 24px 28px,
    var(--ivory) 28px 38px
  );
}

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 8px;
  top: 16px;
  z-index: 60;
  background: var(--brass);
  padding: 8px;
}

.bar {
  position: sticky;
  top: 10px;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 24px;
  background: rgba(243, 234, 216, 0.92);
  border-bottom: 1px solid var(--line);
}

.logo {
  font-family: var(--serif);
  font-weight: 600;
}

.logo small {
  display: block;
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--mute);
}

.open {
  display: none;
  margin-left: auto;
  background: var(--ebony);
  color: var(--ivory);
  border: 0;
  padding: 6px 12px;
}

#menu {
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: 14px;
}

#menu a {
  color: var(--mute);
}

#menu a:hover,
#menu a.now {
  color: var(--felt);
}

.go {
  display: inline-flex;
  padding: 8px 14px;
  background: var(--felt);
  color: var(--ivory) !important;
  text-decoration: none !important;
}

.cover {
  position: relative;
  min-height: 86vh;
}

.cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(20, 19, 17, 0.15), rgba(20, 19, 17, 0.82));
}

.cover-text {
  position: relative;
  z-index: 1;
  color: var(--ivory);
  padding: 18vh 8vw 10vh;
  max-width: 820px;
}

.k {
  font-family: var(--serif);
  font-style: italic;
  color: var(--brass);
  letter-spacing: 0.08em;
}

h1 {
  font-family: var(--serif);
  font-size: clamp(40px, 7vw, 78px);
  line-height: 1.08;
  margin: 8px 0 16px;
}

h1 em {
  color: var(--brass);
  font-style: italic;
}

h2 {
  font-family: var(--serif);
  font-size: clamp(26px, 3.5vw, 40px);
}

h3 {
  font-family: var(--serif);
  margin: 0 0 8px;
}

.acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.ghost {
  border: 1px solid var(--ivory);
  padding: 8px 14px;
  color: var(--ivory);
}

.sheet {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0;
}

.dusk {
  width: 100%;
  background: #efe4ce;
  padding: 72px 0;
}

.dusk .k,
.dusk h2,
.dusk .note,
.dusk .stave,
.dusk .three {
  width: min(1080px, calc(100% - 40px));
  margin-left: auto;
  margin-right: auto;
}

.note {
  color: var(--mute);
}

.three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.three article {
  background: #fffaf0;
  border: 1px solid var(--line);
  padding: 16px;
  border-top: 4px solid var(--brass);
}

.three ul,
#edge ol {
  margin: 0;
  padding-left: 1.1em;
}

.three li {
  color: var(--mute);
}

.stave {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
  margin: 36px auto;
}

.stave.reverse {
  direction: rtl;
}

.stave.reverse > * {
  direction: ltr;
}

.stave img {
  width: 100%;
  height: 250px;
  object-fit: cover;
}

figcaption {
  font-size: 13px;
  color: var(--mute);
  font-style: italic;
  margin-top: 8px;
}

.stave p {
  color: var(--mute);
}

.kb {
  margin-top: 12px;
  padding: 10px;
  background: var(--ebony);
  color: var(--ivory);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.kb button {
  background: var(--brass);
  border: 0;
  color: var(--ebony);
  padding: 6px 10px;
}

.six {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  list-style: none;
  padding: 0;
}

.six li {
  background: #fffaf0;
  padding: 14px;
  border-bottom: 3px solid var(--felt);
}

.six p {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
}

#edge ol {
  max-width: 42em;
}

footer {
  background: var(--ebony);
  color: var(--ivory-2);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 22px 6vw;
  font-size: 13px;
}

footer a {
  color: var(--brass);
}

@media (max-width: 860px) {
  .open {
    display: block;
  }

  #menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 16px 18px;
    background: var(--ivory);
    border-bottom: 1px solid var(--line);
  }

  #menu.open {
    display: flex;
  }

  .three,
  .stave,
  .stave.reverse,
  .six,
  footer {
    grid-template-columns: 1fr;
    direction: ltr;
    display: grid;
  }

  footer {
    display: flex;
    flex-direction: column;
  }

  .stave img {
    height: 190px;
  }
}