:root {
  --navy: #0F1F3D;
  --navy-2: #16294E;
  --orange: #FF6B35;
  --cyan: #00D4FF;
  --violet: #7B2FF7;
  --mist: #F2F4F7;
  --line: #E0E3E8;
  --ink: #2A2E35;
  --white: #FFFFFF;
  --green: #2ECC71;
  --yellow: #F1C40F;
  --ink-soft: #4A5568;
  --link: #0B7A99;
  --shadow-card: 0 2px 14px rgba(15,31,61,.07);
  --font-head: "Inter Tight", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Serif SC", "Source Han Serif", "Songti SC", serif;
  --font-num: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", monospace;
  --content: 1200px;
  --radius: 8px;
  --radius-lg: 14px;
  --header-bg: rgba(15,31,61,.94);
  --ease: .2s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 140px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: .95rem;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--mist);
  background-image:
    linear-gradient(rgba(15,31,61,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15,31,61,.035) 1px, transparent 1px);
  background-size: 26px 26px;
  min-height: 100vh;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--navy);
  line-height: 1.2;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button {
  font-family: var(--font-head);
  cursor: pointer;
}

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

::selection {
  background: rgba(0,212,255,.25);
}

#main-content {
  scroll-margin-top: 140px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 2000;
  padding: .7rem 1.2rem;
  background: var(--orange);
  color: #fff;
  font-family: var(--font-head);
  font-size: .85rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: top .2s ease;
}

.skip-link:focus-visible {
  top: 12px;
  text-decoration: none;
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 5;
  height: 3px;
  width: calc(var(--progress, 0) * 100%);
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  border-radius: 0 2px 2px 0;
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.site-header__inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header__mast {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding: .85rem 0 .75rem;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 52px;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: .05rem;
  justify-self: center;
  line-height: 1.15;
  color: #fff;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand__name {
  font-family: var(--font-head);
  font-size: clamp(1.45rem, 4vw, 1.9rem);
  font-weight: 800;
  letter-spacing: .08em;
  color: #fff;
  line-height: 1.1;
}

.brand__sub {
  font-family: var(--font-num);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
  opacity: .85;
}

.mast-meta {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-num);
  font-size: .78rem;
  letter-spacing: .04em;
  color: rgba(255,255,255,.65);
  white-space: nowrap;
}

.mast-meta--left {
  justify-self: start;
}

.mast-meta--right {
  justify-self: end;
}

.mast-meta__status {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}

.mast-meta__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(46,204,113,.18);
}

.mast-meta__archive {
  padding-left: 1rem;
  border-left: 1px solid rgba(255,255,255,.15);
  color: rgba(255,255,255,.85);
}

.mast-meta__archive [data-year] {
  color: var(--orange);
  font-weight: 700;
}

.site-nav {
  flex: 1;
}

.site-nav__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0 .2rem;
}

.site-nav__item {
  display: inline-flex;
}

.site-nav__link {
  display: block;
  padding: .75rem 1rem;
  color: rgba(255,255,255,.72);
  font-family: var(--font-head);
  font-size: .88rem;
  font-weight: 500;
  letter-spacing: .02em;
  text-decoration: none;
  border-bottom: 3px solid transparent;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.site-nav__link:hover {
  color: #fff;
  text-decoration: none;
  border-bottom-color: var(--cyan);
  background: rgba(0,212,255,.06);
}

.site-nav__link[aria-current="page"] {
  color: #fff;
  font-weight: 600;
  border-bottom-color: var(--orange);
}

.nav-alert {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  flex-shrink: 0;
  padding: .42rem .95rem;
  border-radius: 999px;
  background: rgba(255,107,53,.14);
  border: 1px solid rgba(255,107,53,.5);
  color: #fff;
  font-family: var(--font-head);
  font-size: .76rem;
  font-weight: 600;
  letter-spacing: .02em;
  text-decoration: none;
  transition: background var(--ease), border-color var(--ease);
}

.nav-alert:hover {
  text-decoration: none;
  background: rgba(255,107,53,.28);
  border-color: var(--orange);
}

.nav-alert__text {
  line-height: 1;
}

.nav-alert__arrow {
  font-family: var(--font-num);
  color: var(--orange);
  font-weight: 700;
  line-height: 1;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--radius);
  transition: background var(--ease);
}

.nav-toggle:hover {
  background: rgba(255,255,255,.1);
}

.nav-toggle__bar {
  width: 20px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .25s ease, opacity .2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-footer {
  background: var(--navy);
  color: rgba(255,255,255,.72);
  font-size: .88rem;
  border-top: 4px solid var(--orange);
}

.site-footer__inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 3.25rem 1.25rem 1.5rem;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 2.25rem;
  margin-bottom: 2.5rem;
}

.site-footer__brand-col {
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.site-footer__trust {
  margin-top: .9rem;
  max-width: 36ch;
  color: rgba(255,255,255,.55);
  font-size: .86rem;
  line-height: 1.7;
}

.site-footer__col,
.site-footer__contact {
  min-width: 0;
}

.site-footer__heading {
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  margin-bottom: .85rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid rgba(255,255,255,.14);
}

.site-footer__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .4rem;
}

.site-footer__list a {
  color: rgba(255,255,255,.68);
  font-family: var(--font-head);
  font-size: .86rem;
  text-decoration: none;
  transition: color var(--ease), padding-left var(--ease);
}

.site-footer__list a:hover {
  color: var(--cyan);
  padding-left: .3rem;
}

.site-footer__contact p + p {
  margin-top: .35rem;
}

.site-footer__line {
  font-size: .84rem;
  line-height: 1.6;
  color: rgba(255,255,255,.6);
}

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem 1.5rem;
  border-top: 1px solid rgba(255,255,255,.12);
  padding-top: 1.25rem;
  font-family: var(--font-num);
  font-size: .75rem;
  color: rgba(255,255,255,.5);
}

.container {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.section {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
}

.section--dark {
  background: var(--navy);
  color: rgba(255,255,255,.8);
}

.section--dark .section__title {
  color: #fff;
}

.section--dark .section__desc {
  color: rgba(255,255,255,.65);
}

.section__head {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  margin-bottom: 2rem;
}

.section__index {
  align-self: flex-start;
  font-family: var(--font-num);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--orange);
  background: rgba(255,107,53,.12);
  padding: .2rem .65rem;
  border-radius: 4px;
  border: 1px solid rgba(255,107,53,.3);
}

.section__title {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 800;
  letter-spacing: .01em;
}

.section__desc {
  max-width: 70ch;
  color: var(--ink-soft);
  font-size: .95rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .62rem 1.35rem;
  border-radius: var(--radius);
  background: var(--white);
  border: 1.5px solid var(--line);
  color: var(--navy);
  font-family: var(--font-head);
  font-size: .86rem;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--ease), color var(--ease), border-color var(--ease), transform .15s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #fff;
}

.btn--primary:hover {
  background: #E85A24;
  border-color: #E85A24;
}

.btn--ghost-dark {
  background: transparent;
  border-color: rgba(255,255,255,.45);
  color: #fff;
}

.btn--ghost-dark:hover {
  border-color: #fff;
  background: rgba(255,255,255,.08);
}

.btn--ghost-light {
  background: transparent;
  border-color: rgba(15,31,61,.35);
  color: var(--navy);
}

.btn--ghost-light:hover {
  background: rgba(15,31,61,.05);
  border-color: var(--navy);
}

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  position: relative;
}

.card--dark {
  background: var(--navy-2);
  border-color: rgba(255,255,255,.12);
}

.card__title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: .4rem;
}

.card--dark .card__title {
  color: #fff;
}

.card__meta {
  font-family: var(--font-num);
  font-size: .76rem;
  color: #94A3B8;
  letter-spacing: .05em;
  margin-bottom: .4rem;
}

.card__text {
  font-size: .92rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.card--dark .card__text {
  color: rgba(255,255,255,.7);
}

.card__foot {
  margin-top: 1rem;
  padding-top: .85rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-num);
  font-size: .78rem;
  color: #94A3B8;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 290px), 1fr));
  gap: 1.1rem;
}

.panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 1px 4px rgba(15,31,61,.04);
}

.panel + .panel {
  margin-top: .6rem;
}

.panel__toggle {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: none;
  border: 0;
  text-align: left;
  font-family: var(--font-head);
  font-size: .95rem;
  font-weight: 600;
  color: var(--navy);
}

.panel__toggle:hover {
  color: var(--orange);
}

.panel__icon {
  font-family: var(--font-num);
  font-size: 1.1rem;
  color: var(--orange);
  transition: transform .2s ease;
}

.panel__body {
  display: none;
  padding: 0 1.25rem 1.25rem;
  font-size: .92rem;
  color: var(--ink-soft);
}

.panel[data-open] .panel__body {
  display: block;
}

.panel[data-open] .panel__icon {
  transform: rotate(45deg);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.75rem;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .45rem 1.05rem;
  border-radius: 999px;
  background: var(--white);
  border: 1.5px solid var(--line);
  color: var(--ink);
  font-family: var(--font-head);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .02em;
  transition: border-color var(--ease), background var(--ease), color var(--ease);
}

.filter-btn:hover {
  border-color: var(--navy);
}

.filter-btn[data-active] {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
}

[data-filter-item][data-hidden] {
  display: none;
}

.chart-frame {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: var(--shadow-card);
}

.chart-frame__title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-num);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #94A3B8;
  margin-bottom: .8rem;
}

.chart-frame__body {
  min-height: 170px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background:
    repeating-linear-gradient(0deg, transparent, transparent 31px, var(--line) 32px),
    repeating-linear-gradient(90deg, transparent, transparent 31px, var(--line) 32px);
}

.chart-frame__body--solid {
  background: var(--mist);
  border-style: solid;
}

.timeline {
  position: relative;
  padding-left: 1.25rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
}

.timeline__item {
  position: relative;
  padding: .35rem 0 .35rem 1rem;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -1.32rem;
  top: .95rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  border: 3px solid var(--mist);
  box-shadow: 0 0 0 1px var(--cyan);
}

.timeline__item--hot::before {
  background: var(--orange);
  box-shadow: 0 0 0 1px var(--orange);
}

.timeline__year {
  font-family: var(--font-num);
  font-weight: 800;
  color: var(--navy);
  font-size: .92rem;
}

.timeline__label {
  font-size: .88rem;
  color: var(--ink-soft);
}

.heatmap {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 4px;
  padding: .25rem 0;
}

.heatmap__cell {
  min-height: 20px;
  border-radius: 3px;
  background: var(--line);
  opacity: .5;
}

.heatmap__cell[data-level="1"] {
  background: #CFE7F6;
  opacity: .85;
}

.heatmap__cell[data-level="2"] {
  background: #77C6E8;
  opacity: .9;
}

.heatmap__cell[data-level="3"] {
  background: var(--cyan);
  opacity: 1;
}

.heatmap__cell[data-level="4"] {
  background: var(--orange);
}

.metric {
  font-family: var(--font-num);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--navy);
  line-height: 1.1;
}

.metric--accent {
  color: var(--orange);
}

.metric__label {
  display: block;
  font-size: .68rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: #94A3B8;
  margin-bottom: .2rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem .5rem;
  list-style: none;
  padding: .85rem 0;
  font-family: var(--font-num);
  font-size: .76rem;
  color: var(--ink-soft);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}

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

.breadcrumb a {
  color: var(--link);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb__item[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

.breadcrumb--dark {
  color: rgba(255,255,255,.65);
}

.breadcrumb--dark .breadcrumb__item:not(:last-child)::after {
  color: rgba(255,255,255,.3);
}

.breadcrumb--dark a {
  color: var(--cyan);
}

.breadcrumb--dark .breadcrumb__item[aria-current="page"] {
  color: #fff;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s ease;
}

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

.back-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.5rem;
  z-index: 95;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  font-size: 1.15rem;
  box-shadow: 0 6px 20px rgba(15,31,61,.3);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity .25s ease, transform .25s ease;
}

.back-top:hover {
  background: var(--orange);
}

.back-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

@media (max-width: 1024px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 820px) {
  .site-header__mast {
    padding: .7rem 0;
  }

  .site-header__bar {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: .5rem;
    min-height: 0;
    padding: .5rem 0;
  }

  .site-nav {
    order: 3;
    flex: 1 1 100%;
    display: none;
  }

  .site-nav[data-open] {
    display: block;
  }

  .site-nav__list {
    flex-direction: column;
    gap: .25rem;
  }

  .site-nav__item {
    display: block;
  }

  .site-nav__link {
    padding: .85rem .5rem;
    border-bottom: 1px solid rgba(255,255,255,.08);
  }

  .site-nav__link[aria-current="page"] {
    border-left: 4px solid var(--orange);
    border-bottom-color: rgba(255,255,255,.08);
    padding-left: .9rem;
    background: rgba(255,107,53,.08);
  }

  .nav-alert {
    margin-left: 0;
  }

  .nav-toggle {
    display: flex;
  }
}

@media (max-width: 560px) {
  .site-header__inner {
    padding: 0 .85rem;
  }

  .site-header__mast {
    gap: .75rem;
    padding: .65rem 0;
  }

  .mast-meta {
    font-size: .7rem;
  }

  .mast-meta__archive {
    display: none;
  }

  .brand__name {
    font-size: 1.45rem;
  }

  .brand__sub {
    font-size: .6rem;
    letter-spacing: .12em;
  }

  .site-footer__inner {
    padding: 2.25rem .85rem 1.25rem;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .back-top {
    transition: none;
  }
}