/* ===========================================================
   KAIYUN主站 — /assets/site.css
   深夜球场绿 × 电子青：三层暗底、斜向精密网格、状态色节奏
   =========================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body,
h1, h2, h3, h4, p,
ul, ol, li, figure, blockquote,
dl, dd, address { margin: 0; }

ul[class],
ol[class] { list-style: none; padding: 0; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
}

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

main { display: block; }

/* ---------- tokens ---------- */
:root {
  --ky-ink: #040B08;
  --ky-night: #07130F;
  --ky-turf: #10241B;
  --ky-cyan: #35E0C8;
  --ky-cyan-bright: #7BF3E4;
  --ky-red: #FF4D5E;
  --ky-yellow: #FFC93C;
  --ky-text: #F2FBF7;
  --ky-muted: #8FA8A0;
  --ky-line: #1E3A2F;

  --ky-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --ky-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --ky-max: 1200px;
  --ky-radius: 4px;
  --ky-pill: 999px;
  --ky-gap: 16px;
  --ky-ease: cubic-bezier(.22, .61, .36, 1);
  --ky-shadow: 0 18px 40px -26px rgba(0, 0, 0, .85);
}

/* ---------- base ---------- */
body {
  min-height: 100vh;
  font-family: var(--ky-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ky-text);
  background-color: var(--ky-night);
  background-image:
    repeating-linear-gradient(115deg, rgba(53, 224, 200, .05) 0 1px, transparent 1px 104px),
    repeating-linear-gradient(65deg, rgba(30, 58, 47, .55) 0 1px, transparent 1px 84px);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

@media (min-width: 768px) {
  body { font-size: 16px; }
}

::selection { background: rgba(53, 224, 200, .32); color: var(--ky-text); }

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

#main-content { scroll-margin-top: 112px; }

/* ---------- typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--ky-sans);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--ky-text);
}

h1 { font-size: clamp(2rem, 1.2rem + 3.6vw, 3.3rem); }
h2 { font-size: clamp(1.45rem, 1rem + 1.6vw, 2.1rem); }
h3 { font-size: 1.125rem; letter-spacing: -.01em; }
h4 { font-size: 1rem; letter-spacing: 0; }

p { max-width: 68ch; }

.ky-num {
  font-family: var(--ky-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

/* ---------- layout ---------- */
.ky-container {
  width: min(100% - 32px, var(--ky-max));
  margin-inline: auto;
}

.ky-container--narrow { width: min(100% - 32px, 760px); }

.ky-section { padding-block: clamp(44px, 7vw, 96px); }
.ky-section--tight { padding-block: clamp(24px, 4vw, 52px); }

.ky-section__head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.ky-eyebrow {
  font-family: var(--ky-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ky-cyan);
}

.ky-title { font-size: clamp(1.5rem, 1rem + 1.8vw, 2.2rem); }

.ky-lede {
  max-width: 66ch;
  color: var(--ky-muted);
  font-size: 15px;
  line-height: 1.75;
}

.ky-chapter {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ky-line);
}

.ky-chapter__no {
  font-family: var(--ky-mono);
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--ky-yellow);
}

.ky-chapter__title {
  font-size: clamp(17px, 1rem + 1vw, 23px);
  font-weight: 800;
  letter-spacing: -.02em;
}

.ky-rule {
  height: 1px;
  border: 0;
  background: var(--ky-line);
}

.ky-stack {
  display: flex;
  flex-direction: column;
  gap: var(--ky-gap);
}

.ky-grid { display: grid; gap: var(--ky-gap); }
.ky-grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.ky-grid--3 { grid-template-columns: repeat(auto-fit, minmax(228px, 1fr)); }

.ky-split {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  align-items: center;
}

/* ---------- buttons ---------- */
.ky-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--ky-pill);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.4;
  cursor: pointer;
  transition: transform .16s var(--ky-ease), background-color .16s var(--ky-ease),
    color .16s var(--ky-ease), border-color .16s var(--ky-ease),
    box-shadow .16s var(--ky-ease);
}

.ky-btn--primary {
  background: var(--ky-cyan);
  color: #04140F;
}

.ky-btn--primary:hover {
  background: var(--ky-cyan-bright);
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -18px rgba(53, 224, 200, .95);
}

.ky-btn--ghost {
  background: rgba(16, 36, 27, .65);
  border-color: var(--ky-line);
  color: var(--ky-text);
}

.ky-btn--ghost:hover {
  border-color: var(--ky-cyan);
  color: var(--ky-cyan-bright);
  transform: translateY(-2px);
}

.ky-btn--signal {
  background: rgba(255, 77, 94, .06);
  border-color: rgba(255, 77, 94, .5);
  color: var(--ky-red);
}

.ky-btn--signal:hover {
  background: rgba(255, 77, 94, .16);
  transform: translateY(-2px);
}

.ky-btn--sm { padding: 8px 16px; font-size: 13px; }

/* ---------- breadcrumb ---------- */
.ky-breadcrumb {
  padding-block: 14px;
  font-size: 13px;
  color: var(--ky-muted);
}

.ky-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.ky-breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.ky-breadcrumb__item:not(:last-child)::after {
  content: "›";
  color: var(--ky-line);
}

.ky-breadcrumb__item[aria-current="page"] { color: var(--ky-text); }

.ky-breadcrumb__link { color: var(--ky-muted); transition: color .16s var(--ky-ease); }
.ky-breadcrumb__link:hover { color: var(--ky-cyan-bright); }

/* ---------- card ---------- */
.ky-card {
  position: relative;
  padding: 20px;
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-radius);
  background: linear-gradient(160deg, rgba(16, 36, 27, .96), rgba(7, 19, 15, .96));
  transition: transform .16s var(--ky-ease), border-color .16s var(--ky-ease),
    box-shadow .16s var(--ky-ease);
}

.ky-card:hover {
  transform: translateY(-2px);
  border-color: rgba(123, 243, 228, .55);
  box-shadow: 0 24px 44px -32px rgba(53, 224, 200, .85);
}

.ky-card--accent {
  border-left: 3px solid var(--ky-cyan);
  padding-left: 18px;
}

.ky-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.ky-card__meta {
  font-family: var(--ky-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--ky-muted);
}

.ky-card__title {
  margin-bottom: 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.ky-card__body {
  color: var(--ky-muted);
  font-size: 14px;
  line-height: 1.72;
}

.ky-card__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--ky-line);
  font-size: 13px;
  color: var(--ky-muted);
}

/* ---------- details ---------- */
.ky-details {
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-radius);
  background: rgba(16, 36, 27, .8);
}

.ky-details__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: color .16s var(--ky-ease);
}

.ky-details__summary:hover { color: var(--ky-cyan-bright); }
.ky-details[open] .ky-details__summary { color: var(--ky-cyan); border-bottom: 1px solid var(--ky-line); }

.ky-details__body {
  padding: 16px 18px;
  color: var(--ky-muted);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- tag ---------- */
.ky-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-pill);
  font-family: var(--ky-mono);
  font-size: 12px;
  letter-spacing: .07em;
  color: var(--ky-muted);
  white-space: nowrap;
}

.ky-tag--live {
  color: var(--ky-red);
  border-color: rgba(255, 77, 94, .5);
  background: rgba(255, 77, 94, .09);
}

.ky-tag--live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ky-red);
  box-shadow: 0 0 0 3px rgba(255, 77, 94, .18);
}

.ky-tag--soon {
  color: var(--ky-yellow);
  border-color: rgba(255, 201, 60, .45);
  background: rgba(255, 201, 60, .09);
}

.ky-tag--done {
  color: var(--ky-cyan);
  border-color: rgba(53, 224, 200, .45);
  background: rgba(53, 224, 200, .09);
}

/* ---------- index list ---------- */
.ky-index { display: grid; }

.ky-index__item { border-bottom: 1px solid var(--ky-line); }

.ky-index__link {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 16px 4px;
  transition: transform .16s var(--ky-ease), color .16s var(--ky-ease);
}

.ky-index__link:hover { transform: translateX(4px); color: var(--ky-cyan-bright); }

.ky-index__no {
  min-width: 2.6em;
  font-family: var(--ky-mono);
  font-size: 13px;
  color: var(--ky-yellow);
}

.ky-index__label { font-weight: 700; font-size: 16px; }

.ky-index__note {
  margin-left: auto;
  font-size: 13px;
  color: var(--ky-muted);
  text-align: right;
}

/* ---------- media ---------- */
.ky-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-radius);
  background: linear-gradient(135deg, #0b1c15, var(--ky-night));
}

.ky-media--16x9 { aspect-ratio: 16 / 9; }
.ky-media--4x3 { aspect-ratio: 4 / 3; }
.ky-media--1x1 { aspect-ratio: 1 / 1; }
.ky-media--portrait { aspect-ratio: 3 / 4; }
.ky-media--wide { aspect-ratio: 21 / 9; }

.ky-media--pattern {
  background-image:
    repeating-linear-gradient(45deg, rgba(53, 224, 200, .12) 0 1px, transparent 1px 16px),
    linear-gradient(150deg, #0d201a, var(--ky-ink));
}

.ky-media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) brightness(.82) contrast(1.06);
}

.ky-media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-size: 12px;
  color: var(--ky-muted);
  background: linear-gradient(transparent, rgba(4, 11, 8, .92));
}

.ky-media__tag { position: absolute; top: 12px; left: 12px; }

/* ---------- skip link ---------- */
.ky-skip {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--ky-pill);
  background: var(--ky-cyan);
  color: #04140F;
  font-size: 14px;
  font-weight: 700;
  transition: top .16s var(--ky-ease);
}

.ky-skip:focus { top: 14px; }

/* ---------- header ---------- */
.ky-header {
  position: sticky;
  top: 0;
  z-index: 120;
  padding-top: 14px;
  transition: padding-top .18s var(--ky-ease);
}

.ky-header[data-scrolled] { padding-top: 8px; }

.ky-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  width: min(100% - 32px, var(--ky-max));
  margin-inline: auto;
  padding: 10px 12px 10px 18px;
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-pill);
  background: rgba(16, 36, 27, .9);
  box-shadow: var(--ky-shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: padding .18s var(--ky-ease);
}

.ky-header[data-scrolled] .ky-header__inner { padding-block: 7px; }

.ky-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.ky-brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(140deg, var(--ky-cyan), #1B8F80);
  color: #04140F;
  font-family: var(--ky-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
}

.ky-brand__name {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.01em;
  text-transform: uppercase;
  color: var(--ky-text);
}

.ky-brand__sub {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--ky-muted);
  text-transform: none;
}

.ky-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.ky-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.ky-nav__link {
  position: relative;
  display: inline-block;
  padding: 9px 14px;
  border-radius: var(--ky-pill);
  font-size: 14px;
  color: var(--ky-muted);
  transition: color .18s var(--ky-ease), background-color .18s var(--ky-ease),
    box-shadow .18s var(--ky-ease);
}

.ky-nav__link:hover {
  color: var(--ky-text);
  background: rgba(53, 224, 200, .09);
}

.ky-nav__link[aria-current="page"] {
  color: var(--ky-text);
  background: rgba(53, 224, 200, .14);
  box-shadow: inset 0 0 0 1px rgba(53, 224, 200, .35);
}

.ky-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 16px;
  height: 2px;
  transform: translateX(-50%);
  background: var(--ky-cyan);
}

.ky-nav__cta { margin-left: 8px; }

.ky-nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 9px 14px;
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-pill);
  font-size: 13px;
  color: var(--ky-text);
  cursor: pointer;
  transition: border-color .16s var(--ky-ease), color .16s var(--ky-ease);
}

.ky-nav-toggle:hover { border-color: var(--ky-cyan); color: var(--ky-cyan-bright); }

.ky-nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--ky-cyan);
}

.ky-nav-toggle__bars::before,
.ky-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--ky-cyan);
  transition: transform .18s var(--ky-ease), opacity .18s var(--ky-ease);
}

.ky-nav-toggle__bars::before { top: -5px; }
.ky-nav-toggle__bars::after { top: 5px; }

.ky-nav-toggle[aria-expanded="true"] .ky-nav-toggle__bars { background: transparent; }
.ky-nav-toggle[aria-expanded="true"] .ky-nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.ky-nav-toggle[aria-expanded="true"] .ky-nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.ky-nav-toggle__text { letter-spacing: .06em; }

.ky-progress {
  height: 2px;
  margin-top: 10px;
  overflow: hidden;
  background: rgba(30, 58, 47, .85);
}

.ky-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--ky-cyan), var(--ky-cyan-bright), var(--ky-yellow));
  transition: transform .12s linear;
}

/* ---------- footer ---------- */
.ky-footer {
  margin-top: clamp(40px, 6vw, 84px);
  border-top: 1px solid var(--ky-line);
  background: var(--ky-ink);
  color: var(--ky-muted);
}

.ky-footer__inner {
  width: min(100% - 32px, var(--ky-max));
  margin-inline: auto;
  padding-top: clamp(40px, 6vw, 72px);
}

.ky-footer__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
}

.ky-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.01em;
  text-transform: uppercase;
  color: var(--ky-text);
}

.ky-footer__theme {
  margin-top: 14px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ky-cyan);
  max-width: 24ch;
}

.ky-footer__desc {
  margin-top: 10px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ky-muted);
}

.ky-footer__title {
  margin-bottom: 14px;
  font-family: var(--ky-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ky-text);
}

.ky-footer__list {
  display: grid;
  gap: 10px;
  font-size: 14px;
}

.ky-footer__link {
  color: var(--ky-muted);
  transition: color .16s var(--ky-ease), padding-left .16s var(--ky-ease);
}

.ky-footer__link:hover { color: var(--ky-cyan-bright); padding-left: 4px; }

.ky-footer__address {
  display: grid;
  gap: 10px;
  font-style: normal;
  font-size: 14px;
  line-height: 1.7;
}

.ky-footer__address strong {
  margin-right: 6px;
  font-weight: 600;
  color: var(--ky-text);
}

.ky-footer__note {
  margin-top: 14px;
  max-width: 32ch;
  font-size: 12.5px;
  line-height: 1.7;
  color: #6E8781;
}

.ky-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-block: 18px;
  border-top: 1px solid var(--ky-line);
  font-size: 13px;
}

.ky-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  max-width: none;
  font-family: var(--ky-mono);
  letter-spacing: .02em;
}

.ky-footer__icp {
  max-width: none;
  font-family: var(--ky-mono);
  letter-spacing: .04em;
  color: #6E8781;
}

/* ---------- reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .4s var(--ky-ease), transform .4s var(--ky-ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .ky-nav__link { padding: 8px 10px; font-size: 13px; }
  .ky-brand__sub { display: none; }
}

@media (max-width: 900px) {
  .ky-header__inner { flex-wrap: wrap; padding-right: 10px; }
  .ky-nav-toggle { display: inline-flex; }

  .ky-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    margin-left: 0;
    padding: 12px;
    border: 1px solid var(--ky-line);
    border-radius: 14px;
    background: rgba(7, 19, 15, .98);
    box-shadow: var(--ky-shadow);
  }

  .ky-header[data-open] .ky-nav { display: flex; }

  .ky-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .ky-nav__link {
    padding: 12px 14px;
    border-radius: 10px;
    font-size: 15px;
  }

  .ky-nav__link[aria-current="page"]::after { display: none; }

  .ky-nav__cta {
    width: 100%;
    margin: 6px 0 0;
  }

  .ky-brand__sub { display: inline; }
}

@media (max-width: 960px) {
  .ky-footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  .ky-footer__grid { grid-template-columns: 1fr; }
  .ky-footer__bottom { flex-direction: column; align-items: flex-start; gap: 6px; }
  .ky-index__link { flex-wrap: wrap; gap: 8px; }
  .ky-index__note { margin-left: 0; text-align: left; width: 100%; }
  .ky-card { padding: 16px; }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  [data-reveal] { opacity: 1; transform: none; }
  .ky-card:hover,
  .ky-btn:hover { transform: none; }
  .ky-index__link:hover { transform: none; }
}