:root {
  --paper: #F4EFE6;
  --light-paper: #FCFAF5;
  --ink: #18202A;
  --body-ink: #232830;
  --print-orange: #FF5A36;
  --orange-deep: #C2411A;
  --signal-green: #C8F135;
  --warm-gray: #D8D2C4;
  --cyan-support: #6FE3E1;
  --ink-soft: #222D3A;
  --radius-lg: 1.5rem;
  --radius-md: 1rem;
  --radius-pill: 999px;
  --container: 1200px;
  --shadow-soft: 0 10px 30px rgba(24, 32, 42, 0.08);
  --shadow-float: 0 16px 40px rgba(24, 32, 42, 0.14);
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: system-ui, "Noto Sans SC", sans-serif;
  font-size: clamp(1rem, 1.2vw, 1.125rem);
  line-height: 1.7;
  color: var(--body-ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

main {
  flex: 1;
}

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

a {
  color: var(--ink);
}

button {
  font-family: inherit;
}

:focus-visible {
  outline: 3px solid var(--print-orange);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: var(--signal-green);
  color: var(--ink);
}

.container {
  width: min(var(--container), calc(100% - 2rem));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 300;
  padding: 0.6rem 1.2rem;
  background: var(--ink);
  color: var(--light-paper);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

.status-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 0.4rem 1rem;
  background: var(--ink);
  color: var(--signal-green);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.status-strip__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal-green);
  animation: statusPulse 2s infinite;
}

@keyframes statusPulse {
  0% { box-shadow: 0 0 0 0 rgba(200, 241, 53, 0.5); }
  70% { box-shadow: 0 0 0 8px rgba(200, 241, 53, 0); }
  100% { box-shadow: 0 0 0 0 rgba(200, 241, 53, 0); }
}

.status-strip__uptime {
  color: var(--warm-gray);
}

.masthead {
  padding: 2.8rem 1rem 1.8rem;
  background: var(--paper);
  text-align: center;
  border-bottom: 1px solid var(--warm-gray);
}

.masthead__eyebrow {
  margin-bottom: 0.8rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange-deep);
}

.masthead__brand {
  display: inline-block;
  font-size: clamp(3.4rem, 9vw, 6.4rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.06em;
  color: var(--ink);
  text-decoration: none;
}

.masthead__brand::after {
  content: "";
  display: block;
  width: 42%;
  height: 7px;
  margin: 0.7rem auto 0;
  border-radius: var(--radius-pill);
  background: var(--print-orange);
}

.masthead__tagline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 0.7rem;
  font-size: clamp(0.95rem, 1.6vw, 1.2rem);
  letter-spacing: 0.16em;
  color: var(--body-ink);
}

.masthead__tagline::before,
.masthead__tagline::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 1px;
  background: var(--warm-gray);
}

.nav-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ink);
  box-shadow: 0 6px 20px rgba(24, 32, 42, 0.18);
}

.nav-bar__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 0;
}

.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 0.2rem;
}

.nav-list__item {
  margin: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--light-paper);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
  background: rgba(252, 250, 245, 0.14);
  color: var(--signal-green);
}

.nav-link[aria-current="page"] {
  background: var(--print-orange);
  color: var(--ink);
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.14);
}

.nav-cta {
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.9rem;
  background: transparent;
  border: 2px solid rgba(200, 241, 53, 0.65);
  border-radius: var(--radius-pill);
  color: var(--signal-green);
  font-size: 0.85rem;
  font-weight: 800;
  cursor: pointer;
}

.nav-toggle__line {
  position: relative;
  display: inline-block;
  width: 14px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: background 0.2s ease;
}

.nav-toggle__line::before,
.nav-toggle__line::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.nav-toggle__line::before {
  top: -5px;
}

.nav-toggle__line::after {
  top: 5px;
}

.nav-toggle.is-active .nav-toggle__line {
  background: transparent;
}

.nav-toggle.is-active .nav-toggle__line::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle.is-active .nav-toggle__line::after {
  top: 0;
  transform: rotate(-45deg);
}

.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: auto;
  padding: 4rem 0 1.4rem;
  background: var(--ink);
  color: var(--light-paper);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -120px;
  width: 420px;
  height: 420px;
  border: 2px solid rgba(200, 241, 53, 0.12);
  border-radius: 50%;
  pointer-events: none;
}

.site-footer::after {
  content: "云";
  position: absolute;
  right: 2rem;
  bottom: -4.5rem;
  font-size: 16rem;
  font-weight: 900;
  line-height: 1;
  color: rgba(252, 250, 245, 0.03);
  pointer-events: none;
  user-select: none;
}

.footer-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.3fr;
  gap: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(244, 239, 230, 0.14);
}

.footer-brand__name {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--signal-green);
}

.footer-brand__note {
  margin-top: 0.4rem;
  color: var(--warm-gray);
  letter-spacing: 0.06em;
}

.footer-trust {
  margin-top: 1.2rem;
  max-width: 44ch;
  font-size: 0.9rem;
  color: rgba(252, 250, 245, 0.72);
}

.footer-links__heading {
  margin-bottom: 1rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal-green);
}

.footer-nav__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.3rem 0.8rem;
  list-style: none;
}

.footer-nav__link {
  display: inline-block;
  padding: 0.15rem 0;
  color: rgba(252, 250, 245, 0.85);
  font-size: 0.92rem;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-nav__link:hover {
  color: var(--signal-green);
}

.footer-contact p {
  margin: 0.25rem 0;
  color: rgba(252, 250, 245, 0.78);
  font-size: 0.92rem;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.2rem;
  font-size: 0.8rem;
  color: var(--warm-gray);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  will-change: transform;
}

.btn--primary {
  background: var(--print-orange);
  color: var(--ink);
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.16), 0 8px 16px rgba(255, 90, 54, 0.2);
}

.btn--primary:hover {
  background: #FF6D4C;
  transform: translateY(-2px);
  box-shadow: 0 6px 0 rgba(0, 0, 0, 0.12), 0 12px 20px rgba(255, 90, 54, 0.25);
}

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}

.btn--ghost:hover {
  background: rgba(24, 32, 42, 0.08);
  transform: translateY(-2px);
}

.btn--light {
  background: transparent;
  color: var(--light-paper);
  border-color: rgba(252, 250, 245, 0.65);
}

.btn--light:hover {
  background: rgba(252, 250, 245, 0.12);
  color: var(--signal-green);
  border-color: var(--signal-green);
  transform: translateY(-2px);
}

.btn--signal {
  background: var(--signal-green);
  color: var(--ink);
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.16);
}

.btn--signal:hover {
  background: #D4F860;
  transform: translateY(-2px);
}

.section {
  padding: clamp(3rem, 6vw, 5.5rem) 0;
}

.section--tight {
  padding: clamp(2rem, 4vw, 3.5rem) 0;
}

.section--dark {
  background: var(--ink);
  color: var(--light-paper);
  border-radius: 2rem;
}

.section--dark .section-title {
  color: var(--light-paper);
}

.section--dark .section-intro {
  color: rgba(252, 250, 245, 0.75);
}

.section-head {
  max-width: 760px;
  margin-bottom: clamp(1.8rem, 3vw, 2.8rem);
}

.section-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--body-ink);
}

.section-label::before {
  content: "";
  width: 1.4rem;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--print-orange);
}

.section--dark .section-label {
  color: var(--signal-green);
}

.section--dark .section-label::before {
  background: var(--signal-green);
}

.section-title {
  font-size: clamp(1.8rem, 3.6vw, 3rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.section-intro {
  margin-top: 0.8rem;
  max-width: 70ch;
  color: rgba(35, 40, 48, 0.75);
}

.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
}

.bento__item {
  position: relative;
  min-height: 8rem;
  padding: clamp(1.4rem, 2.4vw, 2rem);
  border: 1px solid rgba(216, 210, 196, 0.7);
  border-radius: var(--radius-lg);
  background: var(--light-paper);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

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

.bento__item--span-4 { grid-column: span 4; }
.bento__item--span-5 { grid-column: span 5; }
.bento__item--span-6 { grid-column: span 6; }
.bento__item--span-7 { grid-column: span 7; }
.bento__item--span-8 { grid-column: span 8; }
.bento__item--span-12 { grid-column: span 12; }

.bento__item--dark {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--light-paper);
}

.bento__item--orange {
  background: var(--print-orange);
  border-color: var(--print-orange);
  color: var(--ink);
}

.bento__item--signal {
  background: var(--signal-green);
  border-color: var(--signal-green);
  color: var(--ink);
}

.card {
  padding: 1.6rem;
  border: 1px solid var(--warm-gray);
  border-radius: var(--radius-md);
  background: var(--light-paper);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

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

.card__meta {
  margin-bottom: 0.6rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--orange-deep);
}

.card__title {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.card__text {
  color: rgba(35, 40, 48, 0.78);
  font-size: 0.95rem;
}

.card__link {
  display: inline-flex;
  margin-top: 1rem;
  padding-bottom: 2px;
  border-bottom: 2px solid var(--print-orange);
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.section--dark .card {
  background: rgba(252, 250, 245, 0.06);
  border-color: rgba(252, 250, 245, 0.14);
}

.section--dark .card__title {
  color: var(--light-paper);
}

.section--dark .card__text {
  color: rgba(252, 250, 245, 0.78);
}

.section--dark .card__meta {
  color: var(--signal-green);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.7rem;
  border-radius: var(--radius-pill);
  background: var(--warm-gray);
  color: var(--body-ink);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.tag--event {
  background: var(--signal-green);
  color: var(--ink);
}

.tag--repair {
  background: var(--print-orange);
  color: var(--ink);
}

.tag--data {
  background: var(--cyan-support);
  color: var(--ink);
}

.stat__value {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
}

.stat__label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: rgba(35, 40, 48, 0.7);
}

.scrollspy {
  position: sticky;
  top: 5.5rem;
  padding: 1rem;
  border: 1px solid var(--warm-gray);
  border-radius: var(--radius-lg);
  background: var(--light-paper);
}

.scrollspy__list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  list-style: none;
}

.scrollspy__link {
  display: inline-flex;
  padding: 0.5rem 0.9rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--body-ink);
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.scrollspy__link:hover {
  background: var(--paper);
  border-color: var(--warm-gray);
  color: var(--ink);
}

.scrollspy__link.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--signal-green);
}

.accordion {
  display: grid;
  gap: 0.75rem;
}

.accordion__item {
  overflow: hidden;
  border: 1px solid var(--warm-gray);
  border-radius: var(--radius-lg);
  background: var(--light-paper);
}

.accordion__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.4rem;
  cursor: pointer;
  color: var(--body-ink);
  font-size: 0.98rem;
  font-weight: 800;
  list-style: none;
  transition: background 0.2s ease;
}

.accordion__summary::-webkit-details-marker {
  display: none;
}

.accordion__summary:hover {
  background: var(--paper);
}

.accordion__summary::after {
  content: "+";
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 50%;
  background: var(--ink);
  color: var(--signal-green);
  font-size: 1.2rem;
  font-weight: 900;
  transition: transform 0.25s ease, background 0.2s ease, color 0.2s ease;
}

.accordion__item[open] .accordion__summary::after {
  background: var(--print-orange);
  color: var(--ink);
  transform: rotate(45deg);
}

.accordion__body {
  padding: 0 1.4rem 1.3rem;
  color: rgba(35, 40, 48, 0.82);
  font-size: 0.95rem;
}

.media-frame {
  position: relative;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 15% 20%, rgba(111, 227, 225, 0.25), transparent 35%),
    radial-gradient(circle at 85% 25%, rgba(200, 241, 53, 0.18), transparent 30%),
    linear-gradient(115deg, transparent 55%, rgba(255, 90, 54, 0.28)),
    var(--ink);
  padding: 1.2rem;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(255, 90, 54, 0.22), transparent 45%),
    radial-gradient(circle at 70% 70%, rgba(200, 241, 53, 0.16), transparent 38%);
  opacity: 0.9;
}

.media-frame::after {
  content: "";
  position: absolute;
  top: -3rem;
  right: -3rem;
  width: 12rem;
  height: 12rem;
  border: 1px dashed rgba(200, 241, 53, 0.6);
  border-radius: 50%;
}

.media-frame img {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__label {
  position: relative;
  z-index: 2;
  color: var(--light-paper);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.media-frame--hero {
  aspect-ratio: 21 / 9;
}

.media-frame--card {
  aspect-ratio: 4 / 3;
}

.tilt {
  transform: rotate(-1.2deg);
  transition: transform 0.3s ease;
}

.tilt--alt {
  transform: rotate(1deg);
}

.tilt:hover,
.tilt--alt:hover {
  transform: rotate(0deg);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1.2rem 0 0;
  list-style: none;
  font-size: 0.85rem;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--body-ink);
}

.breadcrumbs li + li::before {
  content: "/";
  color: var(--warm-gray);
}

.breadcrumbs a {
  color: var(--orange-deep);
  font-weight: 700;
  text-decoration: none;
}

.breadcrumbs [aria-current="page"] {
  color: var(--body-ink);
}

.to-top {
  position: fixed;
  right: 1.4rem;
  bottom: 1.4rem;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.6rem;
  height: 3.6rem;
  border: 0;
  border-radius: 50%;
  background: var(--print-orange);
  color: var(--ink);
  cursor: pointer;
  box-shadow: var(--shadow-float);
  opacity: 0;
  visibility: hidden;
  transform: translateY(1rem) scale(0.92);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover {
  background: #FF6D4C;
}

.to-top__ring {
  position: absolute;
  inset: 5px;
  width: calc(100% - 10px);
  height: calc(100% - 10px);
  transform: rotate(-90deg);
}

.to-top__track {
  fill: none;
  stroke: rgba(24, 32, 42, 0.25);
  stroke-width: 3;
}

.to-top__bar {
  fill: none;
  stroke: var(--signal-green);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 125.6;
  stroke-dashoffset: 125.6;
  transition: stroke-dashoffset 0.08s linear;
}

.to-top__arrow {
  margin-top: -2px;
  font-size: 1.4rem;
  font-weight: 900;
  line-height: 1;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (max-width: 920px) {
  .nav-bar__inner {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    order: 3;
    flex-basis: 100%;
  }

  .site-nav[data-open] {
    display: block;
    animation: navReveal 0.25s ease both;
  }

  @keyframes navReveal {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.4rem 0 0.8rem;
  }

  .nav-list__item {
    border-top: 1px solid rgba(252, 250, 245, 0.1);
  }

  .nav-link {
    display: flex;
    width: 100%;
    border-radius: 0.75rem;
    padding: 0.85rem 1rem;
  }

  .nav-cta {
    margin-left: auto;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 760px) {
  .bento {
    grid-template-columns: 1fr;
  }

  .bento__item--span-4,
  .bento__item--span-5,
  .bento__item--span-6,
  .bento__item--span-7,
  .bento__item--span-8,
  .bento__item--span-12 {
    grid-column: span 1;
  }

  .section--dark {
    border-radius: 1.5rem;
  }
}

@media (max-width: 640px) {
  .status-strip {
    gap: 0.6rem;
  }

  .status-strip__uptime {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .media-frame--hero {
    aspect-ratio: 16 / 10;
  }
}

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

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

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .to-top {
    transition: none;
  }
}