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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(rgba(42, 64, 96, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 64, 96, 0.14) 1px, transparent 1px);
  background-size: 36px 36px;
  padding-top: 96px;
}

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
}

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

ul,
ol {
  list-style: none;
}

/* ===== VARIABLES ===== */
:root {
  --color-bg: #0B1D3A;
  --color-bg-alt: #122A4A;
  --color-bg-light: #F2F6FA;
  --color-accent: #00FF88;
  --color-accent-deep: #00C26B;
  --color-warning: #FF6B00;
  --color-warning-light: #FF8C33;
  --color-text: #E6F0F7;
  --color-muted: #8A9BAB;
  --color-grid: #2A4060;

  --font-display: 'DIN Condensed', 'Impact', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', 'Cascadia Code', 'Noto Sans Mono CJK SC', 'Microsoft YaHei', monospace;

  --container: 1240px;
  --header-top: 16px;
  --header-h: 56px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;

  --z-header: 1000;
  --z-progress: 2000;
  --z-skip: 3000;
}

/* ===== TYPOGRAPHY ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  transform: skewX(-6deg);
  font-weight: 900;
}

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

h3 {
  font-size: clamp(1.25rem, 2vw, 1.75rem);
}

h4 {
  font-size: 1.125rem;
}

h5,
h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1em;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

:focus-visible {
  outline: 2px solid var(--color-warning);
  outline-offset: 2px;
}

/* ===== CONTAINER / LAYOUT ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: 24px;
}

.section {
  padding-block: var(--space-7);
}

.section--tight {
  padding-block: var(--space-5);
}

#main-content {
  outline: none;
  scroll-margin-top: 96px;
}

#main-content:focus-visible {
  outline: 2px solid var(--color-warning);
  outline-offset: -2px;
}

.hero-split {
  display: grid;
  gap: 40px;
  align-items: center;
  padding-block: var(--space-5);
}

.hero-split__content {
  min-width: 0;
}

.hero-split__visual {
  min-height: 300px;
  position: relative;
}

@media (min-width: 768px) {
  .hero-split {
    grid-template-columns: 1fr 1fr;
  }
}

.grid-2,
.grid-3 {
  display: grid;
  gap: var(--space-4);
}

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

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

.layout {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

.layout__main {
  grid-column: 1 / 8;
}

.layout__side {
  grid-column: 9 / 13;
}

@media (max-width: 900px) {
  .layout {
    display: block;
  }

  .layout__main,
  .layout__side {
    margin-bottom: var(--space-4);
  }
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 10px 24px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-bg);
  background: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 0;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn:hover {
  background: transparent;
  color: var(--color-accent);
}

.btn--orange {
  background: var(--color-warning);
  border-color: var(--color-warning);
  color: var(--color-bg);
}

.btn--orange:hover {
  background: transparent;
  color: var(--color-warning);
  border-color: var(--color-warning);
}

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

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

.btn--sm {
  min-height: 36px;
  padding: 6px 16px;
  font-size: 13px;
}

.btn--lg {
  min-height: 52px;
  padding: 14px 36px;
  font-size: 17px;
}

/* ===== BREADCRUMB ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: var(--space-4);
}

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

.breadcrumb__item:not(:first-child)::before {
  content: '/';
  margin-right: var(--space-2);
  color: var(--color-grid);
}

.breadcrumb__link {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.breadcrumb__link:hover {
  color: var(--color-accent);
}

.breadcrumb__item[aria-current='page'] {
  color: var(--color-accent);
}

/* ===== CARD ===== */
.card {
  position: relative;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-grid);
  border-left: 3px solid var(--color-grid);
  padding: var(--space-4);
  transform: skewX(-1deg);
  overflow: hidden;
  transition: border-color 0.25s, border-left-color 0.25s, background 0.25s;
}

.card--flat {
  transform: none;
}

.card:hover {
  border-color: rgba(0, 255, 136, 0.55);
  border-left-color: var(--color-accent);
  background: rgba(18, 42, 74, 0.8);
}

.card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 40%, rgba(0, 255, 136, 0.06) 45%, rgba(0, 255, 136, 0.1) 50%, rgba(0, 255, 136, 0.06) 55%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
  pointer-events: none;
}

.card:hover::after {
  transform: translateX(100%);
}

/* ===== DATA FRAME ===== */
.data-frame {
  position: relative;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-grid);
  padding: var(--space-4);
  overflow: hidden;
}

.data-frame::before,
.data-frame::after {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  pointer-events: none;
}

.data-frame::before {
  top: 8px;
  left: 8px;
  border-top: 2px solid var(--color-accent);
  border-left: 2px solid var(--color-accent);
}

.data-frame::after {
  bottom: 8px;
  right: 8px;
  border-bottom: 2px solid var(--color-accent);
  border-right: 2px solid var(--color-accent);
}

/* ===== MEDIA FRAME ===== */
.media-frame {
  position: relative;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-grid);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.media-frame::before,
.media-frame::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  pointer-events: none;
  z-index: 1;
}

.media-frame::before {
  top: 8px;
  left: 8px;
  border-top: 2px solid rgba(0, 255, 136, 0.7);
  border-left: 2px solid rgba(0, 255, 136, 0.7);
}

.media-frame::after {
  bottom: 8px;
  right: 8px;
  border-bottom: 2px solid rgba(0, 255, 136, 0.7);
  border-right: 2px solid rgba(0, 255, 136, 0.7);
}

.media-frame--tall {
  min-height: 320px;
}

.media-frame--short {
  min-height: 140px;
}

.media-frame > img,
.media-frame > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== TABLE ===== */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 14px;
}

.data-table th,
.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-grid);
  text-align: left;
  white-space: nowrap;
}

.data-table th {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
  background: var(--color-bg-alt);
}

.data-table tbody tr {
  transition: background 0.15s;
}

.data-table tbody tr:hover {
  background: rgba(0, 255, 136, 0.04);
}

/* ===== BADGE ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  background: rgba(0, 255, 136, 0.08);
  border: 1px solid rgba(0, 255, 136, 0.35);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.badge--orange {
  color: var(--color-warning);
  background: rgba(255, 107, 0, 0.1);
  border-color: rgba(255, 107, 0, 0.4);
}

/* ===== PROSE ===== */
.prose {
  font-size: 15px;
  line-height: 1.8;
}

.prose p {
  margin-bottom: var(--space-3);
}

.prose ul,
.prose ol {
  margin: 0 0 var(--space-3) 1.4em;
}

.prose ul {
  list-style: square;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: var(--space-2);
}

.prose blockquote {
  border-left: 3px solid var(--color-accent);
  padding: var(--space-2) var(--space-3);
  margin: var(--space-4) 0;
  color: var(--color-muted);
  font-style: normal;
  background: rgba(0, 255, 136, 0.03);
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  color: var(--color-accent-deep);
}

.prose h2,
.prose h3 {
  margin-top: var(--space-5);
  margin-bottom: var(--space-3);
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: var(--header-top);
  left: 16px;
  right: 16px;
  z-index: var(--z-header);
}

.site-header__inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 8px 12px 8px 20px;
  background: rgba(11, 29, 58, 0.88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(0, 255, 136, 0.35);
  border-radius: 999px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  text-decoration: none;
}

.site-brand__mark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 24px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transform: skewX(-6deg);
  color: var(--color-text);
  transition: color 0.2s;
}

.site-brand:hover .site-brand__mark {
  color: var(--color-accent);
}

.site-brand__dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-text);
  margin-left: 6px;
  flex-shrink: 0;
}

.site-brand__text {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  border-left: 1px solid var(--color-grid);
  padding-left: 12px;
  margin-left: 12px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-nav__list {
  counter-reset: nav-index;
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__item {
  counter-increment: nav-index;
  display: flex;
  align-items: center;
}

.site-nav__link {
  counter-increment: nav-index;
  position: relative;
  display: inline-block;
  padding: 8px 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.03em;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s;
}

.site-nav__link::before {
  content: counter(nav-index, decimal-leading-zero) ' /';
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 400;
  color: var(--color-muted);
  opacity: 0.55;
  position: relative;
  top: -4px;
  margin-right: 3px;
  transition: color 0.2s, opacity 0.2s;
}

.site-nav__link::after {
  content: '';
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s;
}

.site-nav__link:hover,
.site-nav__link[aria-current='page'] {
  color: var(--color-accent);
}

.site-nav__link:hover::before,
.site-nav__link[aria-current='page']::before {
  color: var(--color-accent);
  opacity: 1;
}

.site-nav__link:hover::after,
.site-nav__link[aria-current='page']::after {
  transform: scaleX(1);
}

.site-nav__cta {
  margin-left: var(--space-2);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 12px;
  border: 1px solid var(--color-grid);
  border-radius: 999px;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 0.2s;
}

.nav-toggle:hover {
  border-color: rgba(0, 255, 136, 0.6);
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.25s, opacity 0.25s, background 0.25s;
}

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

.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);
  background: var(--color-accent);
}

/* ===== FOOTER ===== */
.site-footer {
  position: relative;
  background: var(--color-bg);
  border-top: 1px solid var(--color-grid);
  padding-top: var(--space-6);
  margin-top: var(--space-7);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, rgba(0, 255, 136, 0.25) 60%, transparent 100%);
  pointer-events: none;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: var(--space-6);
}

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

.site-footer__col--brand .site-brand__mark {
  font-size: 28px;
}

.site-footer__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
  margin-top: var(--space-3);
}

.site-footer__trust {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-muted);
  opacity: 0.75;
  border-left: 2px solid var(--color-grid);
  padding-left: var(--space-3);
  margin-top: var(--space-3);
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--space-3);
  padding-left: 12px;
  position: relative;
}

.site-footer__heading::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  transform: translateY(-50%);
}

.site-footer__links {
  display: grid;
  gap: var(--space-2);
}

.site-footer__links a {
  display: inline-block;
  font-size: 14px;
  color: var(--color-muted);
  text-decoration: none;
  padding: 2px 0;
  transition: color 0.2s, padding-left 0.2s;
}

.site-footer__links a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.site-footer__contact-list {
  display: grid;
  gap: var(--space-2);
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  overflow-wrap: break-word;
}

.site-footer__note {
  font-size: 13px;
  color: var(--color-muted);
  opacity: 0.7;
  line-height: 1.6;
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-grid);
}

.site-footer__bottom {
  border-top: 1px solid var(--color-grid);
  padding: var(--space-3) 0;
}

.site-footer__bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.site-footer__copyright {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.site-footer__icp {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.download-dock {
  background: var(--color-warning);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.download-dock__link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 52px;
  padding: 10px 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.06em;
  color: var(--color-bg);
  text-decoration: none;
  text-transform: uppercase;
  transition: background 0.2s;
}

.download-dock__link:hover {
  background: var(--color-warning-light);
}

.download-dock__icon {
  font-size: 18px;
  line-height: 1;
}

.download-dock__label {
  white-space: nowrap;
}

.download-dock__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.04em;
  background: rgba(255, 255, 255, 0.25);
  padding: 2px 8px;
  text-transform: none;
}

/* ===== SKIP LINK / SCROLL PROGRESS ===== */
.skip-link {
  position: fixed;
  top: -100%;
  left: 16px;
  z-index: var(--z-skip);
  display: inline-block;
  padding: 12px 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--color-bg);
  background: var(--color-accent);
  border-radius: 0;
  text-decoration: none;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 16px;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--color-accent);
  z-index: var(--z-progress);
  pointer-events: none;
  transition: width 0.05s linear;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 900px) {
  .site-nav {
    position: absolute;
    top: calc(100% + 8px);
    left: 8px;
    right: 8px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3);
    background: rgba(11, 29, 58, 0.97);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border: 1px solid rgba(0, 255, 136, 0.35);
    border-radius: 12px;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
  }

  .site-nav[data-open] {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav__item {
    display: flex;
  }

  .site-nav__link {
    display: block;
    padding: 12px 14px;
    font-size: 16px;
    border-radius: 0;
  }

  .site-nav__link::before {
    top: 0;
    margin-right: 6px;
  }

  .site-nav__link::after {
    left: 14px;
    right: auto;
    width: 24px;
    bottom: 8px;
  }

  .site-nav__cta {
    margin: var(--space-3) 0 0;
    justify-content: center;
    width: 100%;
  }

  .nav-toggle {
    display: flex;
  }

  .site-brand__text {
    display: none;
  }
}

@media (max-width: 600px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  .container {
    padding-inline: 16px;
  }

  .site-header {
    left: 8px;
    right: 8px;
  }

  .site-header__inner {
    padding-left: 16px;
  }

  .site-brand__mark {
    font-size: 20px;
  }

  .site-brand__dot {
    width: 5px;
    height: 5px;
    margin-left: 4px;
  }

  .download-dock__tag {
    display: none;
  }
}

@media (max-width: 400px) {
  .site-brand__mark {
    font-size: 18px;
    letter-spacing: 0.02em;
  }

  .btn--sm.site-nav__cta {
    font-size: 12px;
    padding: 6px 12px;
  }
}

/* ===== 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;
  }

  .scroll-progress {
    display: none;
  }
}