/* /assets/site.css */
:root {
  --ink: #071A16;
  --panel: #0E2A23;
  --line: #1C4A3D;
  --mint: #19F5C5;
  --mint-deep: #0FA88A;
  --amber: #F2B84B;
  --coral: #FF6B5E;
  --paper: #E8F4EF;
  --muted: #8AA79D;
  --deep: #04100D;
  --shadow: 0 8px 0 rgba(4, 16, 13, 0.82);
  --font-display: "Arial Black", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "SFMono-Regular", "Cascadia Mono", "Roboto Mono", Consolas, monospace;
}

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

html {
  min-width: 320px;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 10% 0%, rgba(25, 245, 197, 0.08), transparent 28rem),
    radial-gradient(circle at 88% 18%, rgba(242, 184, 75, 0.07), transparent 24rem),
    linear-gradient(180deg, #071A16 0%, #071A16 60%, #04100D 100%);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(28, 74, 61, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 74, 61, 0.16) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.72), transparent 72%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.72), transparent 72%);
}

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

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

main {
  display: block;
}

p {
  margin: 0 0 1em;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.6em;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: var(--paper);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
}

h3 {
  font-size: clamp(1.25rem, 2.6vw, 1.55rem);
}

a {
  color: var(--mint-deep);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--mint);
}

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

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 400;
  display: inline-block;
  padding: 0.7rem 1rem;
  background: var(--mint);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow);
  font-weight: 900;
  text-decoration: none;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, #071A16 0%, #071A16 72%, #0E2A23 100%);
  color: var(--paper);
  border-bottom: 3px solid var(--line);
  box-shadow: 0 7px 0 rgba(4, 16, 13, 0.86);
}

.frame-bar {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 16px 0 12px;
  border-bottom: 1px solid rgba(28, 74, 61, 0.75);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  color: var(--paper);
  text-decoration: none;
}

.brand:hover {
  color: var(--paper);
}

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
  border: 2px solid var(--mint);
  background: var(--panel);
  color: var(--mint);
  box-shadow: 4px 4px 0 var(--deep);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.08em;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.brand:hover .brand-mark {
  background: var(--mint);
  color: var(--ink);
  transform: translate(-2px, -2px);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.2;
}

.brand-name {
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: -0.035em;
  white-space: nowrap;
}

.brand-tagline {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.frame-meta {
  margin: 0 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.version-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--amber);
  background: var(--amber);
  color: var(--ink);
  box-shadow: 3px 3px 0 var(--deep);
  font-weight: 800;
  white-space: nowrap;
}

.frame-note {
  padding-left: 10px;
  border-left: 1px solid var(--line);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  border: 2px solid var(--line);
  background: var(--panel);
  color: var(--paper);
  box-shadow: 3px 3px 0 var(--deep);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

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

.nav-toggle-line {
  position: relative;
  display: block;
  width: 20px;
  height: 2px;
  background: var(--mint);
  box-shadow: 0 -6px 0 var(--mint), 0 6px 0 var(--mint);
  transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.nav-toggle-line::before,
.nav-toggle-line::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--mint);
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.site-header[data-open] .nav-toggle-line {
  background-color: transparent;
  box-shadow: none;
  transform: rotate(45deg);
}

.site-header[data-open] .nav-toggle-line::before,
.site-header[data-open] .nav-toggle-line::after {
  opacity: 1;
}

.site-header[data-open] .nav-toggle-line::after {
  transform: rotate(90deg);
}

.nav-toggle-text {
  font-size: 0.86rem;
  white-space: nowrap;
}

.site-nav {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 20px;
  background: linear-gradient(90deg, rgba(28, 74, 61, 0.24), transparent 14%, transparent 86%, rgba(28, 74, 61, 0.24));
  border-left: 2px solid var(--line);
  border-right: 2px solid var(--line);
}

.nav-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item {
  position: relative;
  margin: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  min-height: 46px;
  padding: 0.55rem 0.9rem;
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.nav-link:hover {
  background: rgba(25, 245, 197, 0.07);
  border-color: var(--line);
  color: var(--paper);
}

.nav-link[aria-current="page"] {
  background: var(--mint);
  box-shadow: inset 0 -4px 0 var(--mint-deep), 0 0 0 1px var(--mint);
  color: var(--ink);
}

.nav-cta {
  align-self: center;
  margin-left: auto;
  margin-right: 10px;
  padding: 0.7rem 1rem;
  border: 2px solid var(--mint);
  background: var(--mint);
  color: var(--ink);
  box-shadow: 4px 4px 0 var(--deep);
  font-weight: 900;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.nav-cta:hover {
  border-color: var(--paper);
  background: var(--paper);
  color: var(--ink);
  box-shadow: 6px 6px 0 var(--deep);
  transform: translate(-2px, -2px);
}

.site-footer {
  position: relative;
  margin-top: 0;
  padding: 38px 0 24px;
  border-top: 3px solid var(--mint);
  background: var(--deep);
  color: var(--paper);
  box-shadow: inset 0 12px 0 rgba(28, 74, 61, 0.28);
}

.footer-frame {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(220px, 1.1fr) minmax(320px, 1.8fr) minmax(260px, 1.1fr);
  gap: 28px;
  align-items: start;
  padding: 0 clamp(12px, 3vw, 30px);
  border-left: 2px solid var(--line);
  border-right: 2px solid var(--line);
}

.footer-brand-panel {
  padding-left: 16px;
  border-left: 4px solid var(--amber);
}

.footer-brand {
  display: inline-block;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.04em;
  text-decoration: none;
}

.footer-brand:hover {
  color: var(--mint);
}

.footer-summary {
  max-width: 28ch;
  margin: 0.7rem 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-version {
  margin: 0;
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.footer-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.footer-column {
  min-width: 0;
}

.footer-heading {
  margin: 0 0 0.7rem;
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
  list-style: none;
}

.footer-link {
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
}

.footer-link:hover,
.footer-link:focus-visible {
  border-bottom-color: var(--mint);
  color: var(--mint);
}

.footer-contact {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.footer-address {
  margin: 0;
  display: grid;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.86rem;
  font-style: normal;
  line-height: 1.6;
}

.contact-line {
  display: grid;
  grid-template-columns: 4.8em 1fr;
  gap: 8px;
  align-items: start;
}

.contact-label {
  padding-top: 0.1em;
  color: var(--mint-deep);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.contact-value {
  overflow-wrap: anywhere;
  color: var(--paper);
}

.footer-bottom {
  grid-column: 1 / -1;
  margin-top: 10px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  color: var(--muted);
  font-size: 0.78rem;
}

.footer-legal {
  margin: 0;
  color: var(--amber);
  font-family: var(--font-mono);
}

.footer-copy {
  margin: 0;
}

.footer-note {
  max-width: 60ch;
  margin: 0 0 0 auto;
  color: var(--muted);
  text-align: right;
}

.container {
  width: min(1200px, calc(100% - 40px));
  margin-inline: auto;
}

.panel {
  position: relative;
  padding: clamp(18px, 4vw, 40px);
  border: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 42, 35, 0.96), rgba(10, 33, 27, 0.96));
  box-shadow: var(--shadow);
}

.panel::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 18px;
  width: 54px;
  height: 3px;
  background: var(--amber);
}

.panel--deep {
  border-color: var(--mint-deep);
  background: var(--deep);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 0.8rem;
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section-title {
  margin: 0 0 1rem;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.lead {
  max-width: 60ch;
  color: var(--paper);
  font-size: 1.1rem;
  line-height: 1.75;
}

.prose {
  max-width: 70ch;
  color: var(--paper);
  line-height: 1.85;
}

.prose p + p {
  margin-top: 1em;
}

.muted {
  color: var(--muted);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.15rem;
  border: 2px solid var(--line);
  background: var(--panel);
  color: var(--paper);
  box-shadow: 4px 4px 0 var(--deep);
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.button:hover {
  box-shadow: 6px 6px 0 var(--deep);
  transform: translate(-2px, -2px);
}

.button--primary {
  border-color: var(--mint);
  background: var(--mint);
  color: var(--ink);
}

.button--primary:hover {
  border-color: var(--paper);
  background: var(--paper);
  color: var(--ink);
}

.button--ghost {
  border-color: var(--mint);
  background: transparent;
  color: var(--mint);
}

.button--ghost:hover {
  background: var(--mint);
  color: var(--ink);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 1.25rem;
  padding: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  list-style: none;
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.4rem;
  color: var(--line);
}

.breadcrumbs a {
  color: var(--mint-deep);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--mint);
}

.grid {
  display: grid;
  gap: 20px;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.image-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 2px solid var(--line);
  background: var(--ink);
  box-shadow: var(--shadow);
}

.image-frame::before {
  content: "";
  position: absolute;
  inset: 8px;
  z-index: 1;
  border: 1px solid rgba(25, 245, 197, 0.25);
  pointer-events: none;
}

.image-frame img,
.image-frame svg {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background:
    linear-gradient(135deg, rgba(28, 74, 61, 0.45), rgba(4, 16, 13, 0.96)),
    repeating-linear-gradient(90deg, transparent 0 23px, rgba(25, 245, 197, 0.13) 24px 25px);
}

.image-frame--wide img,
.image-frame--wide svg {
  aspect-ratio: 21 / 9;
}

.image-frame--square img,
.image-frame--square svg {
  aspect-ratio: 1 / 1;
}

.image-frame figcaption {
  position: relative;
  z-index: 2;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  font-size: 0.8rem;
}

.reading-progress {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 300;
  height: 3px;
  background: rgba(28, 74, 61, 0.65);
  pointer-events: none;
}

.reading-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--mint) 0%, var(--amber) 78%, var(--coral) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.08s linear;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

@media (max-width: 1080px) {
  .nav-link {
    padding-inline: 0.7rem;
  }

  .frame-note {
    display: none;
  }
}

@media (max-width: 860px) {
  .frame-bar {
    padding: 12px 0;
  }

  .frame-meta {
    margin-left: auto;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: 10px;
  }

  .site-nav {
    display: block;
    max-height: 0;
    overflow: hidden;
    padding: 0;
    border-left: 0;
    border-right: 0;
    transition: max-height 0.35s ease;
  }

  .site-header[data-open] .site-nav {
    max-height: calc(100vh - 92px);
    overflow-y: auto;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: #0A211B;
  }

  .nav-list {
    display: block;
    padding: 8px 0;
  }

  .nav-item {
    border-top: 1px solid rgba(28, 74, 61, 0.6);
  }

  .nav-item:first-child {
    border-top: 0;
  }

  .nav-link {
    min-height: 48px;
    padding: 0.8rem 1rem;
    border: 0;
    color: var(--paper);
  }

  .nav-link:hover {
    background: rgba(25, 245, 197, 0.1);
  }

  .nav-link[aria-current="page"] {
    background: var(--mint);
    box-shadow: inset 5px 0 0 var(--mint-deep);
    color: var(--ink);
  }

  .nav-cta {
    display: block;
    margin: 12px 14px 18px;
    text-align: center;
  }

  .footer-frame {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand-panel {
    grid-column: 1 / -1;
  }

  .footer-nav {
    grid-column: 1;
  }

  .footer-contact {
    grid-column: 2;
  }

  .footer-note {
    margin-left: 0;
    text-align: left;
  }

  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .frame-bar {
    gap: 10px;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
  }

  .brand-name {
    font-size: 1.08rem;
  }

  .brand-tagline {
    display: none;
  }

  .frame-meta {
    font-size: 0.66rem;
  }

  .version-chip {
    padding: 0.22rem 0.4rem;
  }

  .nav-toggle-text {
    display: none;
  }

  .container {
    width: calc(100% - 28px);
  }

  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }

  .footer-frame {
    grid-template-columns: 1fr;
    padding: 0 14px;
  }

  .footer-nav {
    grid-column: auto;
    grid-template-columns: 1fr;
    padding-top: 18px;
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .footer-contact {
    grid-column: auto;
    padding-top: 18px;
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .footer-bottom {
    display: grid;
  }
}

@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;
    scroll-behavior: auto !important;
  }

  .reading-progress__bar {
    transition: none;
  }

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