:root {
  --color-primary: #0B1D3A;
  --color-primary-light: #1A3A6A;
  --color-secondary: #6C8EB2;
  --color-accent: #FF7F2A;
  --color-accent-hover: #E66A1F;
  --color-bg-dark: #0A0F1E;
  --color-bg-light: #F5F7FA;
  --color-surface: #FFFFFF;
  --color-text-primary: #F0F4F8;
  --color-text-secondary: #A0B4C8;
  --color-success: #2ECB7E;
  --color-warning: #FFB84D;
  --color-error: #E55B5B;
  --font-heading: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-small: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1200px;
  --header-height: 72px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.35s ease;
  --border-radius: 6px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  color: #1a1a2e;
  background: var(--color-bg-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: 1rem;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  line-height: 1.2;
}

.sr-only {
  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;
  top: -100%;
  left: 1rem;
  z-index: 10000;
  padding: 0.5rem 1.25rem;
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== Grid Background ===== */
.grid-bg {
  background-image:
    linear-gradient(rgba(108,142,178,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108,142,178,0.08) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  border: 2px solid transparent;
  line-height: 1.4;
}

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

.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
  box-shadow: 0 0 20px rgba(255,127,42,0.35);
}

.btn--outline {
  background: transparent;
  color: var(--color-text-primary);
  border-color: rgba(240,244,248,0.4);
}

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

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

/* ===== Progress Bar ===== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-warning));
  z-index: 9999;
  transition: width 0.08s linear;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .progress-bar {
    transition: none;
  }
}

/* ===== Site Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9000;
  height: var(--header-height);
  background: transparent;
  transition: background var(--transition-base), box-shadow var(--transition-base);
  padding: 0 1.5rem;
}

.site-header[data-scrolled] {
  background: rgba(10,15,30,0.97);
  box-shadow: 0 2px 24px rgba(0,0,0,0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header__slash {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent) 20%, var(--color-secondary) 60%, transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.site-header[data-scrolled] .header__slash {
  opacity: 0.6;
}

.header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: 100%;
  gap: 1.5rem;
  position: relative;
}

.header__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.375rem;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
}

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

.logo__pulse {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 10px rgba(255,127,42,0.7);
  animation: pulse-dot 2s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); box-shadow: 0 0 10px rgba(255,127,42,0.7); }
  50% { opacity: 0.6; transform: scale(0.85); box-shadow: 0 0 20px rgba(255,127,42,0.3); }
}

.logo__text {
  white-space: nowrap;
}

.header__sub {
  font-family: var(--font-small);
  font-size: 0.7rem;
  font-weight: 300;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  display: none;
}

@media (min-width: 640px) {
  .header__sub {
    display: inline-block;
  }
}

.header__nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10,15,30,0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 2.5rem 1.5rem;
  overflow-y: auto;
  z-index: 9001;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.header__nav[data-open] {
  display: block;
  opacity: 1;
  visibility: visible;
}

.nav__list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  max-width: 400px;
  margin: 0 auto;
}

.nav__item {
  border-bottom: 1px solid rgba(108,142,178,0.12);
}

.nav__link {
  display: block;
  padding: 0.875rem 0;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.nav__link:hover {
  color: var(--color-accent);
  padding-left: 0.75rem;
}

.nav__link:hover::after {
  width: 48px;
}

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

.nav__link[aria-current="page"]::after {
  width: 48px;
}

.header__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.25rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  margin-left: auto;
  white-space: nowrap;
  border: 2px solid var(--color-accent);
}

.header__cta:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
  box-shadow: 0 0 24px rgba(255,127,42,0.4);
  transform: scale(1.02);
}

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

.header__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  background: transparent;
  border-radius: var(--border-radius);
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.header__toggle:hover {
  background: rgba(255,255,255,0.06);
}

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

.toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}

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

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

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

/* ===== Desktop Nav ===== */
@media (min-width: 900px) {
  .header__nav {
    display: flex;
    position: static;
    background: none;
    backdrop-filter: none;
    padding: 0;
    opacity: 1;
    visibility: visible;
    overflow: visible;
    flex: 1;
    justify-content: center;
  }

  .nav__list {
    flex-direction: row;
    gap: 0.125rem;
    max-width: none;
    margin: 0;
    align-items: center;
  }

  .nav__item {
    border-bottom: none;
  }

  .nav__link {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    letter-spacing: 0.03em;
    color: var(--color-text-secondary);
    border-radius: var(--border-radius);
    transition: color var(--transition-fast), background var(--transition-fast);
  }

  .nav__link::after {
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    border-radius: 2px;
  }

  .nav__link:hover {
    color: var(--color-text-primary);
    background: rgba(255,255,255,0.04);
    padding-left: 1rem;
  }

  .nav__link:hover::after {
    width: 60%;
  }

  .nav__link[aria-current="page"] {
    color: var(--color-accent);
    background: rgba(255,127,42,0.08);
  }

  .nav__link[aria-current="page"]::after {
    width: 60%;
    background: var(--color-accent);
  }

  .header__cta {
    margin-left: 0;
  }

  .header__toggle {
    display: none;
  }
}

/* ===== Site Footer ===== */
.site-footer {
  background: var(--color-bg-dark);
  color: var(--color-text-secondary);
  padding: 3.5rem 1.5rem 1.5rem;
  position: relative;
  border-top: 1px solid rgba(108,142,178,0.1);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent) 20%, var(--color-secondary) 60%, transparent);
  opacity: 0.3;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

@media (min-width: 640px) {
  .footer__inner {
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 2rem;
  }
}

.footer__logo {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin-bottom: 0.75rem;
  transition: color var(--transition-fast);
}

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

.footer__desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  max-width: 360px;
}

.footer__trust {
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--color-secondary);
  padding: 0.75rem 1rem;
  background: rgba(255,127,42,0.06);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  max-width: 400px;
}

.footer__heading {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin-bottom: 1.25rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer__heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer__list a {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  padding: 0.125rem 0;
  display: inline-block;
}

.footer__list a:hover {
  color: var(--color-accent);
  padding-left: 0.5rem;
}

.footer__contact {
  font-size: 0.875rem;
  line-height: 1.8;
}

.contact__item {
  margin-bottom: 0.25rem;
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.contact__item a {
  color: var(--color-secondary);
  transition: color var(--transition-fast);
}

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

.footer__note {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--color-secondary);
  opacity: 0.8;
  font-style: italic;
  padding: 0.5rem 0.75rem;
  background: rgba(108,142,178,0.06);
  border-radius: var(--border-radius);
}

.footer__divider {
  max-width: var(--max-width);
  margin: 2rem auto 1.5rem;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(108,142,178,0.25) 30%, rgba(108,142,178,0.25) 70%, transparent);
}

.footer__bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-align: center;
}

@media (min-width: 640px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__copyright {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  opacity: 0.75;
  letter-spacing: 0.02em;
}

/* ===== Responsive Fine-tune ===== */
@media (max-width: 399px) {
  .header__cta {
    display: none;
  }
}

@media (min-width: 400px) and (max-width: 899px) {
  .header__cta {
    margin-left: auto;
  }
}

/* ===== Focus & Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .site-header {
    transition: none;
  }

  .header__nav {
    transition: none;
  }

  .logo__pulse {
    animation: none;
    box-shadow: 0 0 6px rgba(255,127,42,0.5);
  }

  .progress-bar {
    transition: none;
  }
}

/* ===== Utility ===== */
@media (max-width: 899px) {
  body.nav-open {
    overflow: hidden;
  }
}

/* ===== Breadcrumb (shared, used by pages) ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem 0.75rem;
  padding: 1rem 0;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.breadcrumb a {
  color: var(--color-secondary);
  transition: color var(--transition-fast);
}

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

.breadcrumb .sep {
  color: var(--color-text-secondary);
  opacity: 0.4;
  user-select: none;
}

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

/* ===== Section Spacing (shared) ===== */
.section {
  padding: 4rem 1.5rem;
}

@media (min-width: 768px) {
  .section {
    padding: 5rem 1.5rem;
  }
}

.section__title {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

.section__sub {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  max-width: 600px;
}

/* ===== Card (shared base) ===== */
.card {
  background: var(--color-surface);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}

.card__title {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}