:root {
  --color-primary: #0B1A3A;
  --color-accent: #D4AF37;
  --color-orange: #F28C28;
  --color-silver: #C0C0C0;
  --color-bg: #F2F4F7;
  --color-text: #1A1A2E;
  --color-white: #FFFFFF;
  --color-red: #C0392B;
  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-heading: var(--font-sans);
  --h1-size: 48px;
  --h2-size: 36px;
  --h3-size: 28px;
  --h4-size: 22px;
  --body-size: 16px;
  --small-size: 14px;
  --line-height-heading: 1.15;
  --line-height-body: 1.7;
  --letter-spacing-heading: -0.02em;
  --letter-spacing-body: 0.01em;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;
  --max-width: 1200px;
  --nav-height: 64px;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--body-size);
  line-height: var(--line-height-body);
  letter-spacing: var(--letter-spacing-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: var(--line-height-heading);
  letter-spacing: var(--letter-spacing-heading);
  color: var(--color-primary);
}

h1 { font-size: var(--h1-size); }
h2 { font-size: var(--h2-size); }
h3 { font-size: var(--h3-size); }
h4 { font-size: var(--h4-size); }

p {
  margin-bottom: 1em;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  background: var(--color-accent);
  color: var(--color-primary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  z-index: 10000;
  font-weight: 700;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-xs);
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(11, 26, 58, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(212, 175, 55, 0.15);
  height: var(--nav-height);
  transition: background var(--transition-smooth);
}

.site-header.scrolled {
  background: rgba(11, 26, 58, 0.98);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-md);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-shrink: 0;
  padding: 4px 12px 4px 0;
  border-right: 1px solid rgba(212, 175, 55, 0.25);
}

.brand-text {
  font-size: 22px;
  font-weight: 900;
  color: var(--color-accent);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.brand-sub {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-silver);
  letter-spacing: 0.5px;
}

.nav-main {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  gap: 2px;
  counter-reset: nav-counter;
}

.nav-item {
  counter-increment: nav-counter;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.3px;
  border-radius: var(--radius-pill);
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

.nav-link::before {
  content: counter(nav-counter, decimal-leading-zero);
  font-size: 11px;
  font-weight: 400;
  color: var(--color-accent);
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  transition: transform var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-white);
  background: rgba(212, 175, 55, 0.1);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--color-accent);
  background: rgba(212, 175, 55, 0.12);
}

.nav-link[aria-current="page"]::after {
  transform: translateX(-50%) scaleX(1);
  background: var(--color-accent);
}

.nav-link[aria-current="page"]::before {
  opacity: 1;
  color: var(--color-accent);
}

.tool-entrance {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: rgba(242, 140, 40, 0.12);
  border: 1px solid rgba(242, 140, 40, 0.25);
  border-radius: var(--radius-pill);
  color: var(--color-orange);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.3px;
  flex-shrink: 0;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.tool-entrance:hover,
.tool-entrance:focus-visible {
  background: var(--color-orange);
  color: var(--color-primary);
  border-color: var(--color-orange);
}

.tool-entrance-icon {
  font-size: 16px;
  line-height: 1;
  transition: transform var(--transition-fast);
}

.tool-entrance:hover .tool-entrance-icon {
  transform: rotate(30deg);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-accent);
}

.nav-toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  padding: var(--space-xl) 0 var(--space-md);
  border-top: 2px solid rgba(212, 175, 55, 0.2);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.footer-brand {
  margin-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(212, 175, 55, 0.12);
  padding-bottom: var(--space-md);
}

.footer-brand-name {
  font-size: 28px;
  font-weight: 900;
  color: var(--color-accent);
  letter-spacing: 1px;
}

.footer-trust {
  font-size: var(--small-size);
  color: var(--color-silver);
  margin-top: 8px;
  max-width: 680px;
  line-height: 1.6;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-col-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.footer-links li {
  margin-bottom: 6px;
}

.footer-links a {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.7);
  padding: 2px 0;
  display: inline-block;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.footer-contact li {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 4px;
  line-height: 1.5;
}

.footer-icp {
  font-size: 14px;
  color: var(--color-silver);
  margin-bottom: 8px;
}

.footer-note {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 4px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(212, 175, 55, 0.1);
  font-size: 13px;
  color: var(--color-silver);
}

.footer-copy {
  color: rgba(255, 255, 255, 0.5);
}

.footer-domain {
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: 0.5px;
}

/* ===== Common Components ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 700;
  font-family: var(--font-sans);
  letter-spacing: 0.3px;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  background: var(--color-accent);
  color: var(--color-primary);
}

.btn:hover,
.btn:focus-visible {
  background: var(--color-primary);
  color: var(--color-accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.3);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background: var(--color-accent);
  color: var(--color-primary);
  border-color: var(--color-accent);
}

.badge {
  display: inline-block;
  padding: 2px 12px;
  font-size: 12px;
  font-weight: 700;
  border-radius: var(--radius-pill);
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.badge-gold {
  background: rgba(212, 175, 55, 0.15);
  color: var(--color-accent);
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.badge-orange {
  background: rgba(242, 140, 40, 0.15);
  color: var(--color-orange);
  border: 1px solid rgba(242, 140, 40, 0.3);
}

.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid rgba(192, 192, 192, 0.25);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  box-shadow: 0 8px 32px rgba(11, 26, 58, 0.08);
  transform: translateY(-2px);
}

.card-highlight {
  border-left: 4px solid var(--color-accent);
}

.section-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: 1px;
  margin-bottom: var(--space-xs);
  font-feature-settings: "tnum";
}

.section-index::after {
  content: '';
  display: block;
  width: 32px;
  height: 2px;
  background: var(--color-accent);
  margin-left: 12px;
  border-radius: 1px;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.content-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-silver);
  padding: var(--space-sm) 0;
}

.breadcrumb a {
  color: var(--color-silver);
  border-bottom: 1px solid transparent;
}

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

.breadcrumb span {
  color: var(--color-accent);
  font-weight: 600;
}

.breadcrumb-sep {
  color: var(--color-silver);
  opacity: 0.4;
  font-size: 12px;
}

.progress-bar {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-orange));
  z-index: 1001;
  transition: width 0.1s linear;
  pointer-events: none;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .footer-columns {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }
}

@media (max-width: 768px) {
  :root {
    --h1-size: 32px;
    --h2-size: 28px;
    --h3-size: 22px;
    --h4-size: 18px;
    --nav-height: 56px;
  }

  .nav-toggle {
    display: flex;
  }

  .header-inner {
    gap: var(--space-sm);
  }

  .brand {
    padding-right: 0;
    border-right: none;
  }

  .brand-text {
    font-size: 18px;
  }

  .brand-sub {
    font-size: 11px;
  }

  .nav-main {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 26, 58, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    padding: var(--space-md);
    transform: translateX(100%);
    transition: transform var(--transition-smooth);
    overflow-y: auto;
    justify-content: flex-start;
    align-items: stretch;
  }

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

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

  .nav-link {
    font-size: 18px;
    padding: 12px 20px;
    justify-content: flex-start;
    border-radius: var(--radius-md);
  }

  .nav-link::after {
    display: none;
  }

  .nav-link[aria-current="page"] {
    background: rgba(212, 175, 55, 0.15);
  }

  .tool-entrance {
    padding: 4px 12px;
    font-size: 12px;
  }

  .tool-entrance-text {
    display: none;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .grid-12 {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0 var(--space-sm);
  }

  .brand-text {
    font-size: 16px;
  }

  .brand-sub {
    font-size: 10px;
  }

  .nav-link {
    font-size: 16px;
    padding: 10px 16px;
  }
}

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

  .progress-bar {
    display: none;
  }
}

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

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