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

:root {
  --color-deep-blue: #0A1A2F;
  --color-neon-green: #2EFF8A;
  --color-orange-red: #FF6B35;
  --color-stone-gray: #979A9E;
  --color-moss-green: #5B8C5A;
  --color-terracotta: #C98A5E;
  --color-ivory: #F5F7FA;
  --color-carbon: #101820;
  --color-white: #FFFFFF;
  --color-blue-bright: #123456;
  --color-blue-muted: #1B3A5A;
  --color-line: rgba(46, 255, 138, 0.18);
  --color-line-soft: rgba(245, 247, 250, 0.12);
  --font-heading: 'PingFang SC', 'Microsoft YaHei UI Bold', 'Noto Sans SC', sans-serif;
  --font-body: 'PingFang SC', 'Helvetica Neue', 'Noto Sans SC', sans-serif;
  --font-data: 'SF Mono', 'Roboto Mono', monospace;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --container-width: 1240px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition-fast: 200ms;
  --transition-base: 300ms;
  --nav-height: 64px;
  --font-size-1: 12px;
  --font-size-2: 14px;
  --font-size-3: 16px;
  --font-size-4: 20px;
  --font-size-5: 28px;
  --font-size-6: 40px;
  --line-height-body: 1.6;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 24px);
  background-color: var(--color-carbon);
}

body {
  font-family: var(--font-body);
  background-color: var(--color-deep-blue);
  color: var(--color-ivory);
  font-size: var(--font-size-3);
  line-height: var(--line-height-body);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.mobile-open {
  overflow: hidden;
}

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

a {
  color: var(--color-neon-green);
  text-decoration: none;
  transition: color var(--transition-fast) ease;
}

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

ul,
ol,
li {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--color-neon-green);
  outline-offset: 3px;
  border-radius: 4px;
}

.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 ===== */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 10000;
  background: var(--color-neon-green);
  color: var(--color-deep-blue);
  font-weight: 700;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  transform: translateY(-120%);
  opacity: 0;
  transition: transform var(--transition-fast) ease, opacity var(--transition-fast) ease;
}

.skip-link:focus {
  transform: translateY(0);
  opacity: 1;
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  width: min(calc(100% - 24px), var(--container-width));
  height: var(--nav-height);
  background: rgba(10, 26, 47, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  transition: background var(--transition-base) ease, border-color var(--transition-base) ease;
}

.new-root .site-header,
.home .site-header {
  background: rgba(10, 26, 47, 0.9);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px 0 16px;
  border-radius: 999px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-white);
  font-family: var(--font-heading);
  letter-spacing: 0.5px;
  transition: transform var(--transition-fast) ease;
}

.brand-link:hover {
  color: var(--color-white);
  transform: translateX(2px);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-neon-green);
  color: var(--color-deep-blue);
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 14px;
  border-radius: 10px 10px 10px 2px;
  letter-spacing: -0.5px;
}

.brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 2px;
  white-space: nowrap;
}

.site-tagline {
  writing-mode: vertical-rl;
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--color-neon-green);
  text-transform: uppercase;
  margin-left: 2px;
  opacity: 0.85;
  line-height: 1.2;
  max-height: 36px;
}

/* ===== DESKTOP NAVIGATION ===== */
.main-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  background: rgba(16, 24, 32, 0.45);
  border-radius: 999px;
  padding: 5px;
}

.nav-link {
  display: inline-block;
  padding: 9px 18px;
  border-radius: 999px;
  color: var(--color-ivory);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.3px;
  position: relative;
  transition: color var(--transition-fast) ease, background var(--transition-fast) ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 4px;
  height: 2px;
  background: var(--color-neon-green);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition-fast) ease;
}

.nav-link:hover {
  color: var(--color-neon-green);
  background: rgba(46, 255, 138, 0.06);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--color-neon-green);
}

/* ===== NAV TOGGLE ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(46, 255, 138, 0.1);
  gap: 5px;
  transition: background var(--transition-fast) ease;
}

.nav-toggle:hover {
  background: rgba(46, 255, 138, 0.24);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-neon-green);
  border-radius: 2px;
  transition: transform var(--transition-fast) ease, opacity var(--transition-fast) 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);
}

/* ===== MOBILE NAV ===== */
.mobile-nav {
  position: fixed;
  top: calc(var(--nav-height) + 20px);
  left: 12px;
  right: 12px;
  z-index: 999;
  background: rgba(10, 26, 47, 0.98);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 12px;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition-base) ease, opacity var(--transition-base) ease;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.mobile-nav[data-open="true"] {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-nav-link {
  display: block;
  padding: 13px 18px;
  border-radius: var(--radius-md);
  color: var(--color-ivory);
  font-size: 17px;
  font-weight: 500;
  transition: background var(--transition-fast) ease, color var(--transition-fast) ease;
  border-left: 3px solid transparent;
}

.mobile-nav-link:hover,
.mobile-nav-link[aria-current="page"] {
  background: rgba(46, 255, 138, 0.08);
  color: var(--color-neon-green);
  border-left-color: var(--color-neon-green);
}

/* ===== PROGRESS BAR ===== */
.page-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  z-index: 2000;
  background: rgba(151, 154, 158, 0.1);
  pointer-events: none;
}

.page-progress-bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-neon-green), var(--color-moss-green));
  border-radius: 0 4px 4px 0;
  transition: width 80ms linear;
}

/* ===== MAIN CONTENT AREA ===== */
#main-content {
  display: block;
  padding-top: calc(var(--nav-height) + 24px);
  min-height: 60vh;
}

#main-content:focus {
  outline: none;
}

/* ===== COMMON CONTAINERS ===== */
.container {
  width: min(calc(100% - 32px), var(--container-width));
  margin-inline: auto;
}

.section-pad {
  padding-block: var(--space-xl);
}

/* ===== SPLIT SECTION ===== */
.split-section {
  display: grid;
  grid-template-columns: 1fr 1.8fr;
  gap: 0;
  width: min(calc(100% - 32px), var(--container-width));
  margin-inline: auto;
  position: relative;
}

.split-left {
  padding: var(--space-xl) var(--space-lg) var(--space-xl) 0;
  border-right: 1px solid var(--color-line-soft);
  position: relative;
}

.split-left::before {
  content: '';
  position: absolute;
  right: -8px;
  top: 40px;
  width: 8px;
  height: 8px;
  background: var(--color-neon-green);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--color-neon-green);
}

.split-right {
  padding: var(--space-xl) 0 var(--space-xl) var(--space-xl);
  position: relative;
}

/* ===== SECTION INDEX ===== */
.section-index {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: var(--space-md);
}

.section-number {
  font-family: var(--font-data);
  font-size: var(--font-size-6);
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--color-neon-green);
  line-height: 0.9;
  letter-spacing: -2px;
  flex-shrink: 0;
}

.section-title-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 6px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-5);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.2;
  letter-spacing: 0.5px;
}

.section-subtitle {
  font-size: var(--font-size-2);
  color: var(--color-stone-gray);
  max-width: 38ch;
}

/* ===== CAPTION NOTES ===== */
.caption-note {
  font-size: var(--font-size-1);
  color: var(--color-stone-gray);
  letter-spacing: 0.4px;
  line-height: 1.5;
}

.caption-note[data-rotated] {
  writing-mode: vertical-rl;
  font-size: 11px;
  opacity: 0.7;
}

/* ===== SPEED LINES ===== */
.speed-line {
  position: relative;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(46, 255, 138, 0.3), transparent);
  overflow: hidden;
}

.speed-line::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 100px;
  background: linear-gradient(90deg, transparent, var(--color-neon-green), transparent);
  animation: speed-line-slide 2s linear infinite;
}

@keyframes speed-line-slide {
  0% {
    transform: translateX(-120px);
    opacity: 0;
  }
  30% {
    opacity: 1;
  }
  100% {
    transform: translateX(calc(100vw + 120px));
    opacity: 0;
  }
}

/* ===== BUTTONS ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--color-neon-green);
  color: var(--color-deep-blue);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--font-size-2);
  line-height: 1;
  letter-spacing: 1px;
  padding: 14px 28px;
  border-radius: 999px;
  transition: background var(--transition-fast) ease, transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
  box-shadow: 0 4px 14px rgba(46, 255, 138, 0.2);
}

.btn-primary:hover {
  background: var(--color-white);
  color: var(--color-deep-blue);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(46, 255, 138, 0.3);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  color: var(--color-ivory);
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: var(--font-size-2);
  line-height: 1;
  padding: 13px 24px;
  border-radius: 999px;
  border: 1px solid var(--color-stone-gray);
  transition: border-color var(--transition-fast) ease, color var(--transition-fast) ease, background var(--transition-fast) ease;
}

.btn-ghost:hover {
  border-color: var(--color-neon-green);
  color: var(--color-neon-green);
  background: rgba(46, 255, 138, 0.05);
}

/* ===== TAG CHIPS ===== */
.tag-chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 15px;
  border-radius: 999px;
  border: 1px solid var(--color-line);
  background: rgba(255, 255, 255, 0.02);
  color: var(--color-stone-gray);
  font-size: var(--font-size-2);
  font-weight: 500;
  letter-spacing: 0.3px;
  transition: all var(--transition-fast) ease;
  cursor: pointer;
  user-select: none;
}

.tag-chip:hover {
  border-color: var(--color-neon-green);
  color: var(--color-neon-green);
}

.tag-chip[data-active="true"] {
  background: var(--color-neon-green);
  border-color: var(--color-neon-green);
  color: var(--color-deep-blue);
  font-weight: 700;
}

/* ===== DATA CARDS ===== */
.data-card {
  background: linear-gradient(145deg, rgba(20, 40, 60, 0.75), rgba(16, 24, 32, 0.9));
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-base) ease, transform var(--transition-base) ease;
}

.data-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 42px;
  height: 42px;
  background: linear-gradient(225deg, transparent 50%, rgba(46, 255, 138, 0.12) 50%);
  transition: background var(--transition-base) ease;
}

.data-card:hover {
  border-color: var(--color-line);
  transform: translateY(-2px);
}

.data-card[data-accent="orange-red"] {
  border-left: 4px solid var(--color-orange-red);
}

.data-card[data-accent="moss"] {
  border-left: 4px solid var(--color-moss-green);
}

.data-card[data-accent="neon"] {
  border-left: 4px solid var(--color-neon-green);
}

.data-card-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-4);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.data-card-meta {
  font-family: var(--font-data);
  font-size: var(--font-size-2);
  color: var(--color-neon-green);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.data-card-meta[data-hot] {
  color: var(--color-orange-red);
}

.data-card-body {
  font-size: var(--font-size-2);
  color: var(--color-stone-gray);
  line-height: 1.6;
}

/* ===== METRIC STRIP ===== */
.metric-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  background: rgba(10, 26, 47, 0.75);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.metric-item {
  position: relative;
  padding-right: 12px;
}

.metric-item + .metric-item {
  border-left: 1px solid var(--color-line-soft);
}

.metric-label {
  font-size: 12px;
  color: var(--color-stone-gray);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.metric-value {
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-neon-green);
  line-height: 1;
}

.metric-value[data-trend="up"]::after {
  content: '↑';
  font-size: 14px;
  margin-left: 6px;
  color: var(--color-orange-red);
}

.metric-value[data-trend="down"]::after {
  content: '↓';
  font-size: 14px;
  margin-left: 6px;
  color: var(--color-terracotta);
}

/* ===== DIVIDER / CORNER CUT ===== */
.corner-cut {
  position: relative;
}

.corner-cut::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  border-style: solid;
  border-width: 0 0 24px 24px;
  border-color: transparent transparent var(--color-deep-blue) transparent;
}

/* ===== FOOTER ===== */
.site-footer {
  position: relative;
  background: var(--color-carbon);
  border-top: 1px solid var(--color-line-soft);
  padding-top: var(--space-xl);
  padding-bottom: var(--space-lg);
  margin-top: var(--space-2xl);
  background-image:
    linear-gradient(180deg, transparent 0%, rgba(10, 26, 47, 0.4) 100%);
}

.speed-line-footer {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  opacity: 0.35;
}

.footer-inner {
  width: min(calc(100% - 32px), var(--container-width));
  margin-inline: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.4fr;
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
}

.footer-brand-block,
.footer-links-block,
.footer-contact-block {
  min-width: 0;
}

.footer-brand {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: var(--space-md);
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: var(--font-size-5);
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: 2px;
}

.footer-brand-tag {
  font-family: var(--font-data);
  font-size: var(--font-size-1);
  color: var(--color-neon-green);
  text-transform: uppercase;
  letter-spacing: 3px;
}

.footer-desc {
  font-size: var(--font-size-2);
  color: var(--color-stone-gray);
  max-width: 34ch;
  line-height: 1.7;
  margin: 0;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: var(--font-size-2);
  font-weight: 600;
  color: var(--color-white);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
  position: relative;
  padding-bottom: 8px;
}

.footer-heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 26px;
  height: 2px;
  background: var(--color-neon-green);
  border-radius: 2px;
}

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

.footer-link {
  color: var(--color-ivory);
  font-size: var(--font-size-2);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color var(--transition-fast) ease, transform var(--transition-fast) ease;
}

.footer-link::before {
  content: '↗';
  color: var(--color-stone-gray);
  transition: color var(--transition-fast) ease;
  font-size: 12px;
}

.footer-link:hover {
  color: var(--color-neon-green);
  transform: translateX(4px);
}

.footer-link:hover::before {
  color: var(--color-neon-green);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: var(--font-size-2);
  color: var(--color-ivory);
  line-height: 1.5;
}

.footer-email {
  color: var(--color-neon-green);
  word-break: break-all;
}

.footer-email:hover {
  text-decoration: underline;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-line-soft);
  font-family: var(--font-data);
  font-size: var(--font-size-1);
  color: var(--color-stone-gray);
  letter-spacing: 0.3px;
}

.footer-copyright,
.footer-icp,
.footer-meta {
  margin: 0;
}

.footer-meta {
  margin-left: auto;
  color: var(--color-terracotta);
}

/* ===== IMAGE CONTAINERS ===== */
.image-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(27, 58, 90, 0.7), rgba(16, 24, 32, 0.7));
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-md);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-frame::before {
  content: 'IMG';
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-stone-gray);
  letter-spacing: 2px;
  transition: color var(--transition-fast) ease;
}

.image-frame:hover::before {
  color: var(--color-neon-green);
}

.image-frame[data-ratio="4/3"] {
  aspect-ratio: 4 / 3;
}

.image-frame[data-ratio="3/4"] {
  aspect-ratio: 3 / 4;
}

.image-frame[data-ratio="1/1"] {
  aspect-ratio: 1 / 1;
}

/* ===== BREADCRUMBS ===== */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: var(--font-size-1);
  color: var(--color-stone-gray);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
}

.breadcrumb-nav a {
  color: var(--color-stone-gray);
  transition: color var(--transition-fast) ease;
}

.breadcrumb-nav a:hover {
  color: var(--color-neon-green);
}

.breadcrumb-nav [aria-current="page"] {
  color: var(--color-neon-green);
}

.breadcrumb-sep {
  color: var(--color-stone-gray);
  opacity: 0.5;
}

/* ===== UTILITY ===== */
.text-neon {
  color: var(--color-neon-green) !important;
}

.text-orange {
  color: var(--color-orange-red) !important;
}

.text-gray {
  color: var(--color-stone-gray) !important;
}

.bg-deep-blue {
  background-color: var(--color-deep-blue) !important;
}

.bg-charcoal {
  background: var(--color-carbon) !important;
}

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

.text-display {
  font-family: var(--font-heading);
  font-size: var(--font-size-6);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 1px;
  color: var(--color-white);
}

.text-display-mono {
  font-family: var(--font-data);
  font-size: var(--font-size-6);
  font-weight: 700;
  line-height: 1;
  color: var(--color-neon-green);
}

/* ===== GRID BASE ===== */
.grid {
  display: grid;
  gap: 16px;
}

.grid-auto {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

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

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

/* ===== FOLDABLE PANEL ===== */
.panel {
  background: rgba(27, 58, 90, 0.25);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-base) ease;
}

.panel[data-open="true"] {
  border-color: var(--color-line);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  gap: 20px;
}

.panel-header:hover .panel-title {
  color: var(--color-neon-green);
}

.panel-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-3);
  font-weight: 600;
  color: var(--color-white);
  transition: color var(--transition-fast) ease;
}

.panel-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  position: relative;
  opacity: 0.8;
}

.panel-icon::before,
.panel-icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--color-neon-green);
  border-radius: 2px;
  transition: transform var(--transition-fast) ease;
}

.panel-icon::before {
  width: 14px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.panel-icon::after {
  width: 2px;
  height: 14px;
  transform: translate(-50%, -50%);
}

.panel[data-open="true"] .panel-icon::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.panel-body {
  padding: 0 20px 20px;
  color: var(--color-stone-gray);
  font-size: var(--font-size-2);
  line-height: 1.7;
  display: none;
}

.panel[data-open="true"] .panel-body {
  display: block;
}

.panel-body[data-empty]::before {
  content: '待补充';
  color: var(--color-stone-gray);
  font-style: italic;
}

/* ===== REVEAL ON SCROLL ===== */
[data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity var(--transition-base) ease, transform var(--transition-base) ease;
}

[data-reveal="fade-up"] {
  opacity: 0;
  transform: translateY(14px);
}

[data-reveal="fade-up"][data-reveal-state="visible"] {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE BREAKPOINTS ===== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl) var(--space-lg);
  }

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

  .split-section {
    grid-template-columns: 1fr;
  }

  .split-left {
    border-right: none;
    border-bottom: 1px solid var(--color-line-soft);
    padding-right: 0;
    padding-bottom: var(--space-lg);
  }

  .split-left::before {
    right: auto;
    top: auto;
    bottom: -5px;
    left: 12px;
  }

  .split-right {
    padding-left: 0;
    padding-top: var(--space-lg);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 56px;
    --font-size-6: 34px;
    --font-size-5: 24px;
    --font-size-4: 18px;
  }

  .main-nav {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-header {
    top: 8px;
    left: 8px;
    right: 8px;
    width: auto;
    height: var(--nav-height);
    transform: none;
    border-radius: 999px;
  }

  .header-inner {
    padding-inline: 10px;
  }

  .brand-name {
    font-size: 18px;
    letter-spacing: 1px;
  }

  .brand-mark {
    width: 28px;
    height: 28px;
    font-size: 12px;
  }

  .site-tagline {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .footer-meta {
    margin-left: 0;
  }

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

  .split-left,
  .split-right {
    padding: var(--space-lg) 0;
  }

  .split-section {
    width: min(calc(100% - 24px), var(--container-width));
  }

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

  .metric-item + .metric-item {
    border-left: none;
    border-top: 1px solid var(--color-line-soft);
    padding-top: 12px;
    padding-right: 0;
    margin-top: 4px;
  }

  .btn-primary,
  .btn-ghost {
    padding: 12px 22px;
    font-size: 13px;
  }
}

@media (max-width: 480px) {
  .container {
    width: min(calc(100% - 20px), var(--container-width));
  }

  .section-number {
    font-size: 28px;
  }

  .text-display,
  .text-display-mono {
    font-size: 28px;
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .page-progress-bar {
    transition: none;
  }

  .speed-line::before {
    animation: none;
    display: none;
  }

  [data-reveal="fade-up"] {
    opacity: 1;
    transform: none;
  }

  [data-reveal="fade-up"][data-reveal-state="visible"] {
    opacity: 1;
    transform: none;
  }
}

/* ===== PRINTH ===== */
@media print {
  .site-header,
  .mobile-nav,
  .page-progress,
  .nav-toggle,
  .skip-link {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }
}