/* ===== Reset & Variables ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg-deep: #0A1F44;
  --color-bg-panel: #071633;
  --color-accent-orange: #FF6B35;
  --color-accent-green: #00E676;
  --color-silver: #C0C0C0;
  --color-white: #FFFFFF;
  --color-text-light: #E0E0E0;
  --font-heading: Impact, "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-mono: "Roboto Mono", "Courier New", monospace;
  --header-h: 64px;
  --rail-w: 280px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.35);
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg-deep);
  background-image:
    linear-gradient(rgba(192, 192, 192, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(192, 192, 192, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 0.5em;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.25rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
}

h3 {
  font-size: 1.25rem;
}

h4 {
  font-size: 1rem;
}

p {
  margin: 0 0 1em;
}

:focus-visible {
  outline: 3px solid var(--color-accent-orange);
  outline-offset: 3px;
}

::selection {
  background: var(--color-accent-orange);
  color: #fff;
}

/* ===== Accessibility ===== */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1500;
  padding: 12px 20px;
  background: var(--color-accent-orange);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 14px;
  letter-spacing: 0.04em;
  transform: translateY(-250%);
  transition: transform 0.2s ease;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.5);
}

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

/* ===== Layout ===== */
#main-content {
  display: block;
  width: 100%;
}

@media (max-width: 1023px) {
  #main-content {
    padding-top: var(--header-h);
  }
}

@media (min-width: 1024px) {
  #main-content {
    margin-left: var(--rail-w);
  }
}

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-narrow {
  max-width: 720px;
  margin-inline: auto;
}

.section-wide {
  max-width: 100%;
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: 24px;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (min-width: 1200px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== Header (mobile-first) ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
}

.header-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding: 0 20px;
  background: var(--color-bg-deep);
  border-bottom: 2px solid var(--color-accent-orange);
  position: relative;
  z-index: 1010;
}

.brand-lockup {
  display: flex;
  align-items: center;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-accent-orange), #FF9500);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  transform: skew(-8deg);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.3);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: -0.02em;
  line-height: 1.15;
  transition: color var(--transition);
}

.brand-tagline {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--color-text-light);
  letter-spacing: 0.05em;
  line-height: 1.3;
  margin-top: 2px;
}

.brand-link:hover .brand-name {
  color: var(--color-accent-orange);
}

/* ===== Nav toggle ===== */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: transparent;
  border: 2px solid var(--color-silver);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}

.nav-toggle:hover {
  border-color: var(--color-accent-orange);
  background: rgba(255, 107, 53, 0.08);
}

.nav-toggle-box {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 20px;
}

.nav-toggle-line {
  display: block;
  height: 2px;
  background: var(--color-white);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-toggle-text {
  font-size: 13px;
}

/* ===== Site nav (drawer mobile) ===== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(300px, 85vw);
  padding: calc(var(--header-h) + 24px) 0 32px;
  background: var(--color-bg-panel);
  border-right: 3px solid var(--color-accent-orange);
  transform: translateX(-105%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
  z-index: 1005;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
}

.site-nav[data-open] {
  transform: translateX(0);
}

body.is-nav-open::before {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(3, 8, 20, 0.78);
  z-index: 1002;
}

.nav-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-silver);
  padding: 0 24px;
  margin-bottom: 12px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 24px;
  font-family: var(--font-heading);
  font-size: 15px;
  color: var(--color-white);
  letter-spacing: 0.04em;
  border-left: 3px solid transparent;
  border-bottom: 1px solid rgba(192, 192, 192, 0.12);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.nav-link:hover {
  background: rgba(255, 107, 53, 0.08);
  color: var(--color-accent-orange);
}

.nav-link.is-scrolling,
.nav-link[aria-current="page"] {
  background: rgba(255, 107, 53, 0.14);
  border-left-color: var(--color-accent-orange);
  color: var(--color-accent-orange);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent-green);
  min-width: 24px;
  letter-spacing: 0.02em;
}

.nav-cta {
  margin: 24px 24px 0;
}

.header-side-note {
  display: none;
}

.scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-orange), var(--color-accent-green));
  transform-origin: 0 50%;
  transform: scaleX(0);
  pointer-events: none;
  z-index: 1100;
}

/* ===== Header (desktop rail) ===== */
@media (min-width: 1024px) {
  .site-header {
    bottom: 0;
    right: auto;
    width: var(--rail-w);
    border-right: 3px solid var(--color-accent-orange);
    display: flex;
    flex-direction: column;
    background: var(--color-bg-deep);
  }

  .header-strip {
    height: auto;
    padding: 36px 24px 0;
    border-bottom: none;
    background: transparent;
  }

  .brand-tagline {
    white-space: nowrap;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    transform: none;
    width: auto;
    padding: 36px 0;
    background: transparent;
    border-right: none;
    overflow: visible;
    z-index: auto;
    flex: 1;
    transition: none;
    box-shadow: none;
  }

  .nav-title {
    padding: 0 24px;
    margin-bottom: 16px;
  }

  .nav-link {
    padding: 14px 24px;
    border-bottom: none;
  }

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

  .header-side-note {
    display: block;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.42em;
    text-transform: uppercase;
    color: var(--color-silver);
    opacity: 0.35;
    padding: 0 6px 18px 0;
    line-height: 1.2;
    align-self: flex-start;
  }

  .scroll-progress {
    position: fixed;
    top: 0;
    bottom: auto;
    left: var(--rail-w);
    right: 0;
  }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent-orange), #FF9500);
  color: #fff;
  border: 2px solid transparent;
  box-shadow: 0 4px 14px rgba(255, 107, 53, 0.32);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.42);
}

.btn-ghost {
  background: transparent;
  border: 2px solid var(--color-silver);
  color: var(--color-white);
}

.btn-ghost:hover {
  border-color: var(--color-accent-orange);
  color: var(--color-accent-orange);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-light);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--color-accent-orange);
}

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

.breadcrumb a:hover {
  color: var(--color-accent-orange);
}

/* ===== Panels ===== */
.panel {
  border: 3px solid var(--color-silver);
  background: var(--color-bg-panel);
  padding: 32px;
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.28);
  margin-bottom: 32px;
  position: relative;
}

@media (max-width: 575px) {
  .panel {
    padding: 22px;
    box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.28);
  }
}

.panel-dark {
  background: #050E22;
  border-color: var(--color-bg-panel);
}

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

/* ===== Media frames ===== */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-panel);
  border: 2px solid var(--color-silver);
  aspect-ratio: 16 / 9;
}

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

.media-frame::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 26%;
  height: 100%;
  background: linear-gradient(135deg, transparent 42%, var(--color-accent-orange) 42%, var(--color-accent-orange) 100%);
  opacity: 0.28;
  z-index: 2;
  pointer-events: none;
}

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

.media-frame-square {
  aspect-ratio: 1 / 1;
}

/* ===== Stat cards ===== */
.stat-card {
  border: 2px solid var(--color-silver);
  background: var(--color-bg-panel);
  padding: 22px;
  position: relative;
  transition: border-color var(--transition), transform var(--transition);
}

.stat-card:hover {
  border-color: var(--color-accent-orange);
  transform: translateY(-2px);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1.1;
  color: var(--color-accent-green);
  display: block;
  margin-bottom: 6px;
}

.stat-label {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--color-text-light);
  display: block;
}

/* ===== Accordion ===== */
.accordion-item {
  border: 2px solid var(--color-silver);
  background: var(--color-bg-panel);
  margin-bottom: 12px;
  transition: border-color var(--transition);
}

.accordion-item.is-open {
  border-color: var(--color-accent-orange);
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 18px 20px;
  background: transparent;
  border: none;
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 16px;
  letter-spacing: 0.02em;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.accordion-trigger:hover {
  background: rgba(255, 107, 53, 0.08);
  color: var(--color-accent-orange);
}

.accordion-trigger::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--color-accent-orange);
  margin-left: 16px;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.accordion-item.is-open .accordion-trigger::after {
  transform: rotate(45deg);
}

.accordion-panel {
  padding: 16px 20px;
  border-top: 1px solid rgba(192, 192, 192, 0.18);
}

.accordion-panel[hidden] {
  display: none;
}

/* ===== Misc components ===== */
.pulse-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent-green);
  animation: pulse 2s ease-out infinite;
  vertical-align: middle;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(0, 230, 118, 0.5);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(0, 230, 118, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(0, 230, 118, 0);
  }
}

.corner-slash {
  position: relative;
}

.corner-slash::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-top: 34px solid var(--color-accent-orange);
  border-left: 34px solid transparent;
  opacity: 0.22;
  pointer-events: none;
  z-index: 1;
}

.vertical-text {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--color-text-light);
  text-transform: uppercase;
}

.data-highlight {
  font-family: var(--font-mono);
  color: var(--color-accent-green);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-bg-panel);
  position: relative;
  z-index: 10;
}

.site-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-orange), #FF9500, var(--color-accent-green));
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding: 48px 24px 40px;
  max-width: 1160px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 40px;
    padding: 56px 24px 48px;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-white);
  margin: 0;
}

.footer-tagline {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
  max-width: 32em;
  margin: 0;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--color-white);
  border-bottom: 2px solid var(--color-accent-orange);
  padding-bottom: 8px;
  margin-bottom: 12px;
  display: inline-block;
  align-self: flex-start;
}

.footer-link {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-text-light);
  text-decoration: none;
  transition: color var(--transition), transform var(--transition);
  display: inline-flex;
  align-items: center;
}

.footer-link::before {
  content: "›";
  color: var(--color-accent-orange);
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 16px;
  transition: margin-right var(--transition);
}

.footer-link:hover {
  color: var(--color-accent-orange);
}

.footer-link:hover::before {
  margin-right: 12px;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-contact-line {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--color-text-light);
  margin: 0;
  line-height: 1.5;
}

.footer-bottom {
  border-top: 1px solid rgba(192, 192, 192, 0.18);
  padding: 16px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  max-width: 1160px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

.footer-copy,
.footer-icp {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-light);
  margin: 0;
}

/* ===== Reduced motion ===== */
@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;
  }

  .pulse-dot {
    animation: none;
  }
}