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

/* ===== Variables ===== */
:root {
  --color-primary: #00A3FF;
  --color-primary-rgb: 0, 163, 255;
  --color-primary-2: #39FF14;
  --color-accent: #FF4500;
  --color-bg-dark: #0B0F1A;
  --color-bg-card: #141A28;
  --color-bg-light: #F5F7FA;
  --color-text-on-dark: #E0E6EF;
  --color-text-muted: #8899AA;
  --color-data-blue: #1E90FF;
  --color-success: #00CC66;

  --font-heading: 'Noto Sans SC', 'Helvetica Neue', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-data: 'Roboto Mono', 'SFMono-Regular', Consolas, monospace;

  --container-w: 1280px;
  --container-pad: 24px;
  --header-main-h: 72px;
  --header-top-h: 32px;
  --border-w: 2px;
  --radius: 2px;
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.45);
  --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ===== Base ===== */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

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

a {
  color: var(--color-data-blue);
}

ul,
ol {
  list-style: none;
}

/* ===== Typography ===== */
h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.2;
  color: var(--color-text-on-dark);
}

h1 {
  font-size: clamp(28px, 4vw, 44px);
}

h2 {
  font-size: clamp(22px, 3vw, 30px);
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 1em;
}

::selection {
  background: rgba(var(--color-primary-rgb), 0.35);
  color: #fff;
}

/* ===== Container ===== */
.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  border: var(--border-w) solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transform: skew(-5deg);
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.btn > * {
  transform: skew(5deg);
}

.btn__icon {
  font-size: 14px;
  line-height: 1;
}

.btn--contact {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--contact:hover,
.btn--contact:focus-visible {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 0 16px rgba(var(--color-primary-rgb), 0.35);
}

.btn--download {
  background: var(--color-primary-2);
  border-color: var(--color-primary-2);
  color: var(--color-bg-dark);
  animation: btn-pulse 2.4s ease-in-out infinite;
}

.btn--download:hover,
.btn--download:focus-visible {
  background: transparent;
  color: var(--color-primary-2);
  animation: none;
  box-shadow: 0 0 18px rgba(57, 255, 20, 0.35);
}

.btn-wrap {
  margin-top: 24px;
}

/* ===== Skip Link ===== */
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 3000;
  padding: 12px 20px;
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow-md);
  transition: top 0.25s ease;
}

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

/* ===== Scroll Progress ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2500;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-2));
  pointer-events: none;
  transition: width 0.08s linear;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 2000;
  background: var(--color-bg-dark);
  border-bottom: var(--border-w) solid rgba(255, 255, 255, 0.06);
  flex-shrink: 0;
}

/* topline */
.site-header__topline {
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.site-header__topline-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: var(--header-top-h);
}

.site-header__version {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

.site-header__version-label {
  background: var(--color-primary);
  color: #fff;
  padding: 1px 6px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.site-header__version-code {
  color: var(--color-primary);
  font-weight: 700;
}

.site-header__status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--color-text-muted);
}

.site-header__status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
  animation: dot-pulse 2s ease-in-out infinite;
}

.site-header__quote {
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

/* main bar */
.site-header__main {
  position: relative;
}

.site-header__main::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-2) 45%, var(--color-accent) 72%, transparent);
  clip-path: polygon(0 0, 100% 30%, 100% 100%, 0 70%);
  z-index: 1;
  pointer-events: none;
}

.site-header__main-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: var(--header-main-h);
  position: relative;
}

/* brand */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand__box {
  width: 42px;
  height: 42px;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 24px;
  color: #fff;
  transform: skew(-5deg);
  box-shadow: 3px 3px 0 var(--color-primary-2);
  border-radius: var(--radius);
  transition: box-shadow var(--transition);
}

.brand:hover .brand__box,
.brand:focus-visible .brand__box {
  box-shadow: 5px 5px 0 var(--color-primary-2);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 20px;
  color: var(--color-text-on-dark);
  letter-spacing: 0.02em;
  transform: skew(-5deg);
}

.brand__sub {
  font-family: var(--font-data);
  font-size: 9px;
  color: var(--color-primary-2);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin-top: 2px;
}

.brand--footer .brand__box {
  width: 34px;
  height: 34px;
  font-size: 20px;
  box-shadow: 2px 2px 0 var(--color-primary-2);
}

.brand--footer .brand__name {
  font-size: 17px;
}

/* nav */
.site-nav {
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  gap: 2px;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 12px;
  color: var(--color-text-on-dark);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  position: relative;
  white-space: nowrap;
  transition: color var(--transition);
}

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

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-primary);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-primary-2);
}

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

.site-nav__index {
  font-family: var(--font-data);
  font-size: 10px;
  color: var(--color-text-muted);
  line-height: 1;
}

/* header actions */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: transparent;
  border: 1px solid var(--color-bg-card);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0;
  transition: border-color var(--transition);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--color-primary);
}

.nav-toggle__line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text-on-dark);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.is-open .nav-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open .nav-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Footer ===== */
.site-footer {
  margin-top: auto;
  background: var(--color-bg-dark);
  border-top: var(--border-w) solid var(--color-primary);
  position: relative;
  flex-shrink: 0;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -3px;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-2) 45%, var(--color-accent) 72%, transparent);
  clip-path: polygon(0 0, 100% 35%, 100% 100%, 0 65%);
  pointer-events: none;
}

.site-footer__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
  padding-top: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.site-footer__legend-item {
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
}

.site-footer__legend-item::before {
  content: '▸ ';
  color: var(--color-primary);
}

.site-footer__main {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.6fr;
  gap: 40px;
  padding-top: 46px;
  padding-bottom: 42px;
}

.site-footer__heading {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 14px;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  transform: skew(-5deg);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.site-footer__about-text {
  font-size: 14px;
  color: var(--color-text-on-dark);
  line-height: 1.7;
  margin-top: 16px;
}

.site-footer__trust {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-top: 14px;
  border-left: 2px solid var(--color-primary);
  padding-left: 12px;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__links a {
  color: var(--color-text-muted);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--transition), padding-left var(--transition);
}

.site-footer__links a:hover,
.site-footer__links a:focus-visible {
  color: var(--color-primary-2);
  padding-left: 4px;
}

.site-footer__contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-footer__contact-label {
  font-family: var(--font-data);
  font-size: 10px;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-footer__contact-value {
  font-size: 14px;
  color: var(--color-text-on-dark);
  line-height: 1.45;
  word-break: break-all;
}

.site-footer__contact-item--full {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  margin-top: 4px;
  padding-top: 10px;
}

.site-footer__service-note {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 12px;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  padding-top: 20px;
  padding-bottom: 20px;
}

.site-footer__bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

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

.site-footer__icp {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  padding: 18px 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-text-muted);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 4px;
}

.breadcrumb li + li::before {
  content: '/';
  margin-left: 2px;
  margin-right: 2px;
  color: var(--color-text-muted);
}

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

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-primary-2);
}

.breadcrumb [aria-current="page"] {
  color: var(--color-text-muted);
}

/* ===== Page Hero ===== */
.page-hero {
  background: var(--color-bg-dark);
  border-bottom: var(--border-w) solid var(--color-primary);
  padding: 52px 0 56px;
  position: relative;
  overflow: hidden;
}

.page-hero::after {
  content: '';
  position: absolute;
  right: -90px;
  top: 50%;
  width: 320px;
  height: 320px;
  background: linear-gradient(135deg, rgba(var(--color-primary-rgb), 0.2), transparent 60%);
  transform: translateY(-50%) rotate(18deg);
  pointer-events: none;
  border-radius: 50%;
}

.page-hero__inner {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  align-items: start;
  position: relative;
  z-index: 1;
}

.page-hero__label {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-primary-2);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-left: 2px solid var(--color-primary);
  padding-left: 10px;
  line-height: 1.5;
  white-space: pre-line;
}

.page-hero__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 44px);
  color: var(--color-text-on-dark);
  transform: skew(-5deg);
  line-height: 1.15;
  margin-bottom: 12px;
}

.page-hero__desc {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.7;
  max-width: 560px;
}

/* ===== Prose ===== */
.prose {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-on-dark);
}

.prose p {
  margin-bottom: 18px;
}

.prose h2 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 22px;
  color: var(--color-primary);
  transform: skew(-5deg);
  margin: 36px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.prose ul {
  margin-bottom: 18px;
  padding-left: 20px;
}

.prose ul li {
  position: relative;
  padding-left: 12px;
  margin-bottom: 6px;
}

.prose ul li::before {
  content: '▸';
  position: absolute;
  left: -6px;
  color: var(--color-primary-2);
  font-family: var(--font-data);
  font-size: 12px;
}

.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  color: var(--color-primary-2);
}

.prose strong {
  color: #fff;
}

/* ===== Section ===== */
.section {
  padding: 56px 0;
}

.section__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.section__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 22px;
  color: var(--color-text-on-dark);
  transform: skew(-5deg);
  position: relative;
  padding-left: 20px;
}

.section__title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 10px;
  height: 10px;
  background: var(--color-primary-2);
  transform: translateY(-50%) skew(5deg);
}

.section__more {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition);
}

.section__more:hover,
.section__more:focus-visible {
  color: var(--color-primary-2);
}

.section--light {
  background: var(--color-bg-card);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

/* ===== Card ===== */
.card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.card:hover,
.card:focus-within {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.card__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 16px;
  color: var(--color-text-on-dark);
  margin-bottom: 8px;
}

.card__body {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.card__meta {
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--color-text-muted);
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

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

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

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

/* ===== Media Frames ===== */
.media-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #162438 0%, #0b1520 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.media-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, transparent calc(50% - 1px), rgba(255, 255, 255, 0.05) 50%, transparent calc(50% + 1px)),
    linear-gradient(0deg, transparent calc(50% - 1px), rgba(255, 255, 255, 0.05) 50%, transparent calc(50% + 1px));
  background-size: 48px 48px;
}

.media-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 30%, rgba(var(--color-primary-rgb), 0.12) 50%, transparent 70%);
  transform: translateX(-30%);
  transition: transform 0.45s ease;
}

.media-frame:hover::after {
  transform: translateX(30%);
}

.media-frame--tactic {
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, #0d1a2e 0%, #122438 100%);
}

.media-frame--tactic::before {
  background:
    linear-gradient(90deg, transparent calc(50% - 1px), rgba(0, 163, 255, 0.12) 50%, transparent calc(50% + 1px)),
    linear-gradient(0deg, transparent calc(50% - 1px), rgba(0, 163, 255, 0.08) 50%, transparent calc(50% + 1px)),
    linear-gradient(0deg, transparent calc(20% - 1px), rgba(0, 163, 255, 0.05) 20%, transparent calc(20% + 1px), transparent calc(80% - 1px), rgba(0, 163, 255, 0.05) 80%, transparent calc(80% + 1px));
  background-size: 64px 64px;
}

.media-frame--heatmap {
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, rgba(0, 163, 255, 0.35) 0%, rgba(255, 69, 0, 0.25) 50%, rgba(57, 255, 20, 0.18) 100%);
}

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

.media-frame__placeholder {
  position: relative;
  z-index: 1;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.35);
  text-transform: uppercase;
}

/* ===== Filter ===== */
[data-filter-bar] {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

[data-filter] {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: transparent;
  border: 1px solid var(--color-bg-card);
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
}

[data-filter]:hover,
[data-filter]:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

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

[data-filterable].is-hidden {
  display: none !important;
}

/* ===== Reveal ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Keyframes ===== */
@keyframes dot-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(0, 204, 102, 0.5);
    opacity: 1;
  }
  50% {
    box-shadow: 0 0 0 4px rgba(0, 204, 102, 0);
    opacity: 0.85;
  }
}

@keyframes btn-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.45);
  }
  50% {
    box-shadow: 0 0 12px 2px rgba(57, 255, 20, 0.3);
  }
}

/* ===== Responsive ===== */
@media (max-width: 1080px) {
  .site-header__main-inner {
    gap: 16px;
  }

  .site-nav__link {
    padding: 8px 8px;
  }

  .site-footer__main {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .site-footer__col--about {
    grid-column: span 2;
  }
}

@media (max-width: 860px) {
  .site-header__topline {
    display: none;
  }

  .site-header__main-inner {
    gap: 12px;
  }

  .site-header__actions .btn--contact {
    display: none;
  }

  .btn--download {
    padding: 8px 14px;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg-dark);
    border-top: 1px solid var(--color-bg-card);
    box-shadow: var(--shadow-lg);
    padding: 18px var(--container-pad) 24px;
    margin: 0;
    display: none;
    z-index: 100;
  }

  .site-nav.is-open {
    display: block;
  }

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

  .site-nav__link {
    padding: 12px 8px;
    font-size: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .site-nav__link::after {
    display: none;
  }

  .site-nav__link[aria-current="page"] {
    color: var(--color-primary-2);
    background: rgba(var(--color-primary-rgb), 0.06);
  }

  .nav-toggle {
    display: flex;
  }

  .page-hero__inner {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-hero__label {
    white-space: normal;
  }
}

@media (max-width: 640px) {
  :root {
    --container-pad: 16px;
  }

  .site-footer__main {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 36px;
  }

  .site-footer__col--about {
    grid-column: auto;
  }

  .site-footer__legend {
    flex-direction: column;
    gap: 8px;
  }

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

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

  .section {
    padding: 40px 0;
  }

  .page-hero {
    padding: 36px 0 40px;
  }
}

@media (max-width: 480px) {
  .brand__sub {
    display: none;
  }

  .btn--download {
    width: 40px;
    padding: 0;
    justify-content: center;
  }

  .btn--download .btn__text {
    display: none;
  }

  .btn__icon {
    transform: none;
  }
}

/* ===== Focus ===== */
:focus-visible {
  outline: 2px solid var(--color-primary-2);
  outline-offset: 2px;
}

/* ===== 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;
  }

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

  .btn--download {
    animation: none;
  }

  .site-header__status-dot {
    animation: none;
  }
}