/* ==========================================================================
   K5 电竞主站 · 共享样式表  /assets/site.css
   深空黑底 + 玻璃层 + 电光青刻度，主客场语义色：熔金橙 / 冷蓝
   ========================================================================== */

/* --- 1. Reset ------------------------------------------------------------ */
*,
*::before,
*::after { box-sizing: border-box; }

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

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, fieldset {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; border-spacing: 0; }

/* --- 2. Tokens ----------------------------------------------------------- */
:root {
  --k5-bg: #07090E;
  --k5-panel: #11151E;
  --k5-cyan: #21E6D2;
  --k5-cyan-deep: #0E6E6B;
  --k5-magenta: #FF2D7A;
  --k5-home: #FFA22B;
  --k5-away: #4C8DFF;
  --k5-ink: #E8EDF5;
  --k5-mute: #8B95A7;
  --k5-edge: rgba(255, 255, 255, 0.16);
  --k5-fog: #0B2C3A;
  --k5-ink-on-cyan: #04201F;
  --k5-ink-on-magenta: #1A0410;

  --k5-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;
  --k5-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
            "Liberation Mono", "Courier New", monospace;

  --k5-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --k5-width: 1400px;
  --k5-pad: clamp(18px, 4vw, 56px);
  --k5-progress: 0;
}

/* --- 3. Base ------------------------------------------------------------- */
body {
  min-height: 100vh;
  background-color: var(--k5-bg);
  background-image:
    linear-gradient(180deg, rgba(33, 230, 210, 0.055) 0%, rgba(7, 9, 14, 0) 32%),
    repeating-linear-gradient(180deg, rgba(232, 237, 245, 0.026) 0 1px, transparent 1px 4px);
  background-attachment: fixed, fixed;
  color: var(--k5-ink);
  font-family: var(--k5-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#main-content { scroll-margin-top: 8rem; }

:focus-visible {
  outline: 2px solid var(--k5-cyan);
  outline-offset: 3px;
}

::selection {
  background: var(--k5-cyan);
  color: var(--k5-ink-on-cyan);
}

@keyframes k5-scan {
  from { background-position: 0 0, 0 0; }
  to   { background-position: 0 0, 0 220px; }
}

@media (min-width: 900px) and (prefers-reduced-motion: no-preference) {
  body { animation: k5-scan 26s linear infinite; }
}

/* --- 4. Layout primitives ------------------------------------------------ */
.k5-container {
  width: min(var(--k5-width), 100%);
  margin-inline: auto;
  padding-inline: var(--k5-pad);
}

.k5-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}

.k5-col-4  { grid-column: span 4; }
.k5-col-6  { grid-column: span 6; }
.k5-col-8  { grid-column: span 8; }
.k5-col-12 { grid-column: span 12; }

@media (max-width: 900px) {
  .k5-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .k5-col-4, .k5-col-6, .k5-col-8 { grid-column: span 6; }
}

@media (max-width: 600px) {
  .k5-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .k5-col-4, .k5-col-6, .k5-col-8, .k5-col-12 { grid-column: span 2; }
}

/* --- 5. Panels / typography atoms --------------------------------------- */
.k5-panel {
  position: relative;
  border: 1px solid var(--k5-edge);
  border-radius: 2px;
  padding: clamp(20px, 3vw, 34px);
}

.k5-panel--glass {
  background: linear-gradient(180deg, rgba(232, 237, 245, 0.075), rgba(232, 237, 245, 0.018));
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.k5-panel--solid {
  background: var(--k5-panel);
}

.k5-title {
  font-size: clamp(1.55rem, 3.6vw, 2.6rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transform: skewX(-2deg);
  transform-origin: left center;
}

.k5-label {
  display: inline-block;
  font-family: var(--k5-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--k5-mute);
}

.k5-num {
  font-family: var(--k5-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

.k5-tone-home { color: var(--k5-home); }
.k5-tone-away { color: var(--k5-away); }

/* --- 6. Buttons ---------------------------------------------------------- */
.k5-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid var(--k5-edge);
  border-radius: 1px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--k5-ink);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  transition: background-color 0.2s var(--k5-ease), color 0.2s var(--k5-ease),
              border-color 0.2s var(--k5-ease), box-shadow 0.2s var(--k5-ease),
              transform 0.2s var(--k5-ease);
}

.k5-btn:hover {
  transform: translateY(-1px);
  border-color: var(--k5-cyan);
  color: var(--k5-cyan);
  box-shadow: 0 0 0 1px rgba(33, 230, 210, 0.25), 0 0 24px rgba(33, 230, 210, 0.18);
}

.k5-btn--cyan {
  background: var(--k5-cyan);
  border-color: var(--k5-cyan);
  color: var(--k5-ink-on-cyan);
}

.k5-btn--cyan:hover {
  background: #5BF3E3;
  border-color: #5BF3E3;
  color: var(--k5-ink-on-cyan);
  box-shadow: 0 0 28px rgba(33, 230, 210, 0.45);
}

.k5-btn--hot {
  background: transparent;
  border-color: rgba(255, 45, 122, 0.5);
  color: var(--k5-magenta);
}

.k5-btn--hot:hover {
  background: var(--k5-magenta);
  border-color: var(--k5-magenta);
  color: var(--k5-ink-on-magenta);
  box-shadow: 0 0 26px rgba(255, 45, 122, 0.42);
}

.k5-btn--ghost {
  background: transparent;
  border-color: var(--k5-edge);
  color: var(--k5-mute);
}

.k5-btn--ghost:hover {
  color: var(--k5-ink);
  border-color: rgba(232, 237, 245, 0.4);
  box-shadow: none;
}

/* --- 7. Header ----------------------------------------------------------- */
.k5-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(7, 9, 14, 0.86);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--k5-edge);
}

.k5-skip {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 90;
  padding: 10px 18px;
  background: var(--k5-cyan);
  color: var(--k5-ink-on-cyan);
  font-family: var(--k5-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: top 0.18s var(--k5-ease);
}

.k5-skip:focus { top: 0; }

.k5-topbar {
  border-bottom: 1px solid transparent;
}

.k5-topbar__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  width: min(var(--k5-width), 100%);
  margin-inline: auto;
  padding: 10px var(--k5-pad);
  min-height: 64px;
}

.k5-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
}

.k5-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  background: var(--k5-cyan);
  color: var(--k5-ink-on-cyan);
  font-family: var(--k5-mono);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  transform: skewX(-8deg);
}

.k5-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.k5-brand__name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--k5-ink);
}

.k5-brand__sub {
  font-family: var(--k5-mono);
  font-size: 0.58rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--k5-mute);
}

.k5-ticker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  font-family: var(--k5-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--k5-mute);
  white-space: nowrap;
}

.k5-ticker__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--k5-cyan);
  box-shadow: 0 0 0 4px rgba(33, 230, 210, 0.14);
}

.k5-ticker__item--hot { color: var(--k5-cyan); }
.k5-ticker__sep { color: rgba(139, 149, 167, 0.55); }

@keyframes k5-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

@media (prefers-reduced-motion: no-preference) {
  .k5-ticker__dot { animation: k5-pulse 2.6s ease-in-out infinite; }
}

.k5-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid rgba(255, 45, 122, 0.45);
  border-radius: 1px;
  background: rgba(255, 45, 122, 0.07);
  color: var(--k5-magenta);
  font-family: var(--k5-mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  white-space: nowrap;
  transition: background-color 0.2s var(--k5-ease), color 0.2s var(--k5-ease),
              border-color 0.2s var(--k5-ease), box-shadow 0.2s var(--k5-ease);
}

.k5-cta:hover {
  background: var(--k5-magenta);
  border-color: var(--k5-magenta);
  color: var(--k5-ink-on-magenta);
  box-shadow: 0 0 22px rgba(255, 45, 122, 0.42);
}

.k5-nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--k5-edge);
  border-radius: 1px;
  color: var(--k5-ink);
  font-family: var(--k5-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  transition: border-color 0.2s var(--k5-ease), color 0.2s var(--k5-ease);
}

.k5-nav-toggle:hover { border-color: var(--k5-cyan); color: var(--k5-cyan); }

.k5-nav-toggle__icon {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.k5-nav-toggle__icon::before,
.k5-nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform 0.22s var(--k5-ease);
}

.k5-nav-toggle__icon::before { top: 0; }
.k5-nav-toggle__icon::after { bottom: 0; }

.k5-nav-toggle[aria-expanded="true"] .k5-nav-toggle__icon::before {
  transform: translateY(4.5px) rotate(45deg);
}

.k5-nav-toggle[aria-expanded="true"] .k5-nav-toggle__icon::after {
  transform: translateY(-4.5px) rotate(-45deg);
}

.k5-navbar {
  border-top: 1px solid var(--k5-edge);
  background: linear-gradient(180deg, rgba(17, 21, 30, 0.72), rgba(7, 9, 14, 0.5));
}

.k5-nav {
  width: min(var(--k5-width), 100%);
  margin-inline: auto;
}

.k5-nav__list {
  display: flex;
  align-items: stretch;
  padding-inline: var(--k5-pad);
  overflow-x: auto;
  scrollbar-width: thin;
}

.k5-nav__list::-webkit-scrollbar { height: 3px; }
.k5-nav__list::-webkit-scrollbar-thumb { background: rgba(33, 230, 210, 0.35); }

.k5-nav__item { display: flex; }

.k5-nav__item + .k5-nav__item { border-left: 1px solid var(--k5-edge); }

.k5-nav__link {
  display: inline-flex;
  align-items: center;
  padding: 13px 21px;
  color: var(--k5-mute);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  white-space: nowrap;
  transition: color 0.18s var(--k5-ease), background-color 0.18s var(--k5-ease);
}

.k5-nav__link:hover {
  color: var(--k5-cyan);
  background: rgba(33, 230, 210, 0.07);
}

.k5-nav__link[aria-current="page"],
.k5-nav__link[aria-current="page"]:hover {
  background: var(--k5-cyan);
  color: var(--k5-ink-on-cyan);
}

.k5-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(var(--k5-progress, 0));
  transform-origin: left center;
  background: linear-gradient(90deg, var(--k5-cyan), var(--k5-magenta));
  pointer-events: none;
}

@media (max-width: 860px) {
  .k5-nav-toggle { display: inline-flex; }

  .k5-nav { display: none; }
  .k5-nav[data-open] { display: block; }

  .k5-nav__list {
    flex-direction: column;
    padding-block: 6px 14px;
    overflow: visible;
    max-height: 72vh;
    overflow-y: auto;
  }

  .k5-nav__item + .k5-nav__item {
    border-left: 0;
    border-top: 1px solid var(--k5-edge);
  }

  .k5-nav__link {
    width: 100%;
    padding: 14px var(--k5-pad);
  }
}

@media (max-width: 700px) {
  .k5-topbar__inner { flex-wrap: wrap; padding-block: 10px; }

  .k5-brand { order: 1; }
  .k5-cta { order: 2; margin-left: auto; }
  .k5-nav-toggle { order: 3; }
  .k5-ticker {
    order: 4;
    flex-basis: 100%;
    margin-left: 0;
    font-size: 0.64rem;
    letter-spacing: 0.1em;
  }
}

@media (max-width: 420px) {
  .k5-brand__sub { display: none; }
  .k5-cta { padding: 7px 11px; font-size: 0.66rem; }
}

/* --- 8. Footer ----------------------------------------------------------- */
.k5-footer {
  margin-top: clamp(56px, 9vw, 130px);
  border-top: 1px solid var(--k5-edge);
  background: linear-gradient(180deg, rgba(17, 21, 30, 0.62), rgba(7, 9, 14, 0.96));
}

.k5-footer__tier { border-bottom: 1px solid var(--k5-edge); }

.k5-footer__tier--scale { padding-block: 26px 22px; }

.k5-footer__scale {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.5vw, 28px);
}

.k5-footer__scale-tag {
  font-family: var(--k5-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--k5-mute);
  white-space: nowrap;
}

.k5-footer__scale-tag--hot { color: var(--k5-cyan); }

.k5-footer__scale-line {
  flex: 1 1 auto;
  min-width: 60px;
  height: 16px;
  background-image:
    repeating-linear-gradient(90deg, rgba(232, 237, 245, 0.34) 0 1px, transparent 1px 16px),
    repeating-linear-gradient(90deg, rgba(33, 230, 210, 0.52) 0 1px, transparent 1px 64px);
  background-repeat: repeat-x, repeat-x;
  background-position: bottom left, bottom left;
  background-size: 16px 8px, 64px 16px;
}

.k5-footer__grid {
  display: grid;
  grid-template-columns: minmax(190px, 1fr) minmax(240px, 1.6fr) minmax(160px, 1fr);
  gap: clamp(24px, 4vw, 60px);
  padding-block: clamp(32px, 4.5vw, 56px);
}

.k5-footer__brandcol { display: flex; flex-direction: column; gap: 10px; }

.k5-footer__brand {
  font-size: 1.18rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  transform: skewX(-2deg);
  transform-origin: left center;
}

.k5-footer__note {
  font-family: var(--k5-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--k5-mute);
}

.k5-footer__nav { display: flex; flex-direction: column; gap: 12px; }

.k5-footer__nav ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px 24px;
}

.k5-footer__link {
  font-size: 0.9rem;
  color: var(--k5-mute);
  transition: color 0.18s var(--k5-ease), padding-left 0.18s var(--k5-ease);
}

.k5-footer__link:hover {
  color: var(--k5-cyan);
  padding-left: 4px;
}

.k5-footer__tier--contact { padding-block: clamp(26px, 3.5vw, 44px); }

.k5-footer__contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px 32px;
  margin-top: 14px;
}

.k5-footer__contact li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--k5-ink);
  overflow-wrap: anywhere;
}

.k5-footer__hours {
  margin-top: 16px;
  font-size: 0.78rem;
  color: var(--k5-mute);
}

.k5-footer__legal { background: rgba(7, 9, 14, 0.72); }

.k5-footer__legalrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  padding-block: 16px;
  font-family: var(--k5-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--k5-mute);
}

.k5-footer__icp { color: var(--k5-mute); }

@media (max-width: 900px) {
  .k5-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .k5-footer__brandcol { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .k5-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .k5-footer__contact { grid-template-columns: minmax(0, 1fr); }
  .k5-footer__scale { flex-wrap: wrap; gap: 10px; }
  .k5-footer__scale-line { flex-basis: 100%; order: 3; }
}

/* --- 9. Content helpers -------------------------------------------------- */
.k5-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  padding-block: 18px;
  font-family: var(--k5-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--k5-mute);
}

.k5-breadcrumb a { color: var(--k5-mute); transition: color 0.18s var(--k5-ease); }
.k5-breadcrumb a:hover { color: var(--k5-cyan); }
.k5-breadcrumb [aria-current="page"] { color: var(--k5-ink); }
.k5-breadcrumb__sep { color: var(--k5-cyan-deep); }

.k5-prose {
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--k5-ink);
}

.k5-prose p + p { margin-top: 1.1em; }
.k5-prose strong { color: var(--k5-cyan); font-weight: 700; }

.k5-prose ul { margin-top: 1em; }

.k5-prose li {
  position: relative;
  padding-left: 20px;
}

.k5-prose li + li { margin-top: 0.55em; }

.k5-prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.82em;
  width: 9px;
  height: 1px;
  background: var(--k5-cyan);
}

/* --- 10. Media ----------------------------------------------------------- */
.k5-media {
  position: relative;
  border: 1px solid var(--k5-edge);
  border-radius: 2px;
  background: linear-gradient(160deg, var(--k5-fog), rgba(7, 9, 14, 0.92));
  overflow: hidden;
}

.k5-media__frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(120% 90% at 18% 12%, rgba(33, 230, 210, 0.16), transparent 62%),
    linear-gradient(160deg, #0B2C3A 0%, #11151E 58%, #07090E 100%);
}

.k5-media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.06);
}

.k5-media__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 13px;
  border-top: 1px solid var(--k5-edge);
  border-right: 1px solid var(--k5-edge);
  background: rgba(7, 9, 14, 0.74);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  color: var(--k5-ink);
  font-family: var(--k5-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.k5-media--wide .k5-media__frame { aspect-ratio: 21 / 9; }
.k5-media--tall .k5-media__frame { aspect-ratio: 3 / 4; }
.k5-media--square .k5-media__frame { aspect-ratio: 1 / 1; }

@media (max-width: 600px) {
  .k5-media--wide .k5-media__frame { aspect-ratio: 16 / 9; }
  .k5-media--tall .k5-media__frame { aspect-ratio: 4 / 5; }
}

/* --- 11. Chips / table / rail / tabs ------------------------------------ */
.k5-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--k5-edge);
  border-radius: 1px;
  color: var(--k5-mute);
  font-family: var(--k5-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
}

.k5-chip--home { color: var(--k5-home); border-color: rgba(255, 162, 43, 0.45); }
.k5-chip--away { color: var(--k5-away); border-color: rgba(76, 141, 255, 0.45); }
.k5-chip--hot  { color: var(--k5-magenta); border-color: rgba(255, 45, 122, 0.45); }

.k5-table {
  width: 100%;
  font-size: 0.9rem;
}

.k5-table th,
.k5-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--k5-edge);
  white-space: nowrap;
}

.k5-table thead th {
  color: var(--k5-mute);
  font-family: var(--k5-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.k5-table tbody tr { transition: background-color 0.18s var(--k5-ease); }
.k5-table tbody tr:hover { background: rgba(232, 237, 245, 0.06); }
.k5-table td.k5-num { text-align: right; }

.k5-rail {
  display: flex;
  gap: 8px;
  padding-bottom: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.k5-rail::-webkit-scrollbar { height: 3px; }
.k5-rail::-webkit-scrollbar-thumb { background: rgba(33, 230, 210, 0.35); }

.k5-rail__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  padding: 9px 13px;
  scroll-snap-align: start;
  border: 1px solid var(--k5-edge);
  background: rgba(17, 21, 30, 0.6);
  color: var(--k5-mute);
  font-family: var(--k5-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  white-space: nowrap;
  transition: color 0.18s var(--k5-ease), background-color 0.18s var(--k5-ease),
              border-color 0.18s var(--k5-ease);
}

.k5-rail__item:hover {
  color: var(--k5-cyan);
  border-color: rgba(33, 230, 210, 0.45);
}

.k5-rail__item[aria-current="true"] {
  background: var(--k5-cyan);
  border-color: var(--k5-cyan);
  color: var(--k5-ink-on-cyan);
}

@media (min-width: 1080px) {
  .k5-rail--y {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
  .k5-rail--y .k5-rail__item { width: 100%; }
}

.k5-tabs {
  display: inline-flex;
  border: 1px solid var(--k5-edge);
  border-radius: 1px;
  overflow: hidden;
}

.k5-tab {
  padding: 9px 17px;
  background: transparent;
  color: var(--k5-mute);
  font-family: var(--k5-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: color 0.18s var(--k5-ease), background-color 0.18s var(--k5-ease);
}

.k5-tab + .k5-tab { border-left: 1px solid var(--k5-edge); }
.k5-tab:hover:not([aria-selected="true"]) { color: var(--k5-cyan); }

.k5-tab[aria-selected="true"] {
  background: var(--k5-cyan);
  color: var(--k5-ink-on-cyan);
}

/* --- 12. Reveal ---------------------------------------------------------- */
.k5-reveal {
  transition: opacity 0.55s var(--k5-ease), transform 0.55s var(--k5-ease);
}

html[data-motion="on"] .k5-reveal:not(.is-in) {
  opacity: 0;
  transform: translateY(16px);
}

/* --- 13. Reduced motion / print ----------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  body { animation: none; }

  html[data-motion="on"] .k5-reveal:not(.is-in) {
    opacity: 1;
    transform: none;
  }
}