/* ==========================================================================
   OPERATIONAL PRECISION DESIGN SYSTEM
   Gate 4 Foundation
   ========================================================================== */

:root {
  /* Colors */
  --ink-1000: #080B10;
  --ink-950:  #0D1118;
  --ink-900:  #131923;
  --ink-800:  #1D2633;

  --paper-50:  #FAFBFC;
  --paper-100: #F4F6F8;
  --paper-200: #E9EDF2;
  --surface:   #FFFFFF;

  --text-strong: #121720;
  --text-body:   #374151;
  --text-muted:  #6B7280;
  --text-on-dark:#F7F9FC;

  --blue-700: #244DCC;
  --blue-600: #315FEA;
  --blue-500: #4774FF;
  --blue-100: #E9EFFF;

  --teal-600: #087F73;
  --teal-500: #0B998A;
  --teal-100: #E3F7F3;

  --amber-600: #B96D08;
  --amber-100: #FFF2D7;

  --red-600: #B83B45;
  --red-100: #FCE8EA;

  --line-light: #DCE2EA;
  --line-dark:  #2A3544;

  /* Typography */
  --font-primary: 'Manrope', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Grid & Spacing (8px base) */
  --ds-space-base: 8px;
  --ds-space-1: calc(var(--ds-space-base) * 0.5); /* 4px */
  --ds-space-2: var(--ds-space-base); /* 8px */
  --ds-space-3: calc(var(--ds-space-base) * 1.5); /* 12px */
  --ds-space-4: calc(var(--ds-space-base) * 2); /* 16px */
  --ds-space-5: calc(var(--ds-space-base) * 3); /* 24px */
  --ds-space-6: calc(var(--ds-space-base) * 4); /* 32px */
  --ds-space-7: calc(var(--ds-space-base) * 6); /* 48px */
  --ds-space-8: calc(var(--ds-space-base) * 8); /* 64px */
  --ds-space-9: calc(var(--ds-space-base) * 12); /* 96px */
  --ds-space-10: calc(var(--ds-space-base) * 16); /* 128px */

  /* Structural */
  --ds-container-max: 1200px;
  --ds-measure-body: 64ch;
  --ds-measure-article: 72ch;
  
  /* Legacy aliases */
  --color-ink: var(--ink-950);
  --color-ink-soft: var(--ink-800);
  --color-muted: var(--text-muted);
  --color-border: var(--line-light);
  --color-surface: var(--surface);
  --color-surface-alt: var(--paper-50);
  --color-accent: var(--blue-700);
  --color-accent-strong: var(--blue-600);
  --color-accent-soft: var(--blue-100);
  --color-success: var(--teal-600);
  --color-danger: var(--red-600);
}

body {
  font-family: var(--font-primary);
  color: var(--text-body);
  background-color: var(--surface);
}
h1, h2, h3, h4, h5, h6 { color: var(--text-strong); font-family: var(--font-primary); }
code, pre, .mono { font-family: var(--font-mono); }

/* Components: Button */
.ds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ds-space-2);
  min-height: 44px;
  padding: 0 var(--ds-space-5);
  font-size: 14px;
  font-weight: 700;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}
.ds-btn--primary {
  background: var(--ink-950);
  color: var(--surface);
  border: 1px solid transparent;
}
.ds-btn--primary:hover {
  background: var(--ink-800);
  transform: translateY(-1px);
}
.ds-btn--secondary {
  background: var(--surface);
  color: var(--ink-950);
  border: 1px solid var(--line-light);
}
.ds-btn--secondary:hover {
  background: var(--paper-50);
  border-color: var(--text-muted);
  transform: translateY(-1px);
}
.ds-btn--text {
  background: transparent;
  color: var(--blue-700);
  padding: 0 var(--ds-space-3);
  min-height: auto;
}
.ds-btn--text:hover {
  text-decoration: underline;
}

/* Components: Badge */
.ds-badge {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 8px;
  border-radius: 2px;
  white-space: nowrap;
}
.ds-badge--status {
  background: var(--blue-100);
  color: var(--blue-700);
}
.ds-badge--evidence {
  background: var(--paper-200);
  color: var(--text-strong);
}
.ds-badge--maturity {
  background: var(--teal-100);
  color: var(--teal-600);
}

/* Components: Evidence Panel */
.ds-panel {
  border: 1px solid var(--line-light);
  border-radius: 8px;
  padding: var(--ds-space-6);
  background: var(--paper-50);
}
.ds-panel-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: var(--ds-space-3);
  color: var(--text-strong);
}

/* Layout */
.ds-container {
  max-width: var(--ds-container-max);
  margin-inline: auto;
  padding-inline: 20px;
}
@media (min-width: 980px) {
  .ds-container {
    padding-inline: 40px;
  }
}

/* ==========================================================================
   GATE 5: GLOBAL SHELL & NAVIGATION
   ========================================================================== */

/* Breadcrumbs */
.ds-breadcrumbs {
  padding-top: var(--ds-space-4);
  padding-bottom: var(--ds-space-2);
}
.ds-breadcrumbs__list {
  display: flex;
  align-items: center;
  gap: var(--ds-space-2);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: var(--text-muted);
}
.ds-breadcrumbs__item {
  display: flex;
  align-items: center;
  gap: var(--ds-space-2);
}
.ds-breadcrumbs__item:not(:last-child)::after {
  content: "/";
  color: var(--line-light);
}
.ds-breadcrumbs__item a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}
.ds-breadcrumbs__item a:hover {
  color: var(--blue-700);
}
.ds-breadcrumbs__item span[aria-current="page"] {
  color: var(--text-strong);
  font-weight: 600;
}

/* Header */
.ds-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-light);
}

.ds-header__inner {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ds-brand {
  display: flex;
  align-items: center;
  gap: var(--ds-space-3);
  text-decoration: none;
}
.ds-monogram {
  width: 36px;
  height: 36px;
  background: var(--paper-50);
  border: 1px solid var(--line-light);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
  color: var(--blue-700);
}
.ds-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.ds-brand-text strong {
  font-size: 16px;
  color: var(--text-strong);
}
.ds-brand-text small {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ds-menu-toggle {
  display: none;
  background: none;
  border: 0;
  padding: var(--ds-space-2);
  cursor: pointer;
  color: var(--text-strong);
}

.ds-nav {
  display: flex;
  align-items: center;
  gap: var(--ds-space-6);
}
.ds-nav__list {
  display: flex;
  align-items: center;
  gap: var(--ds-space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}
.ds-nav__item {
  position: relative;
}
.ds-nav__link {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  padding: var(--ds-space-1) 0;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease;
}
.ds-nav__link:hover, .ds-nav__link[aria-current="page"] {
  color: var(--text-strong);
}

/* Dropdown */
.ds-nav__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--surface);
  border: 1px solid var(--line-light);
  border-radius: 8px;
  padding: var(--ds-space-2) 0;
  min-width: 200px;
  list-style: none;
  margin: var(--ds-space-2) 0 0;
  box-shadow: 0 10px 24px rgba(0,0,0,0.06);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.2s ease;
  z-index: 50;
}
.ds-nav__dropdown-toggle[aria-expanded="true"] + .ds-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.ds-nav__dropdown-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}
.ds-nav__dropdown-link {
  display: block;
  padding: 8px var(--ds-space-4);
  font-size: 14px;
  color: var(--text-body);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}
.ds-nav__dropdown-link:hover, .ds-nav__dropdown-link.active {
  background: var(--paper-50);
  color: var(--blue-700);
}

.ds-nav__actions {
  display: flex;
  align-items: center;
  gap: var(--ds-space-4);
}
.ds-nav__lang {
  font-size: 13px;
  font-weight: 700;
  color: var(--blue-700) !important;
  text-decoration: none;
  padding: var(--ds-space-1) var(--ds-space-2);
  border-radius: 4px;
  transition: background 0.2s ease;
}
.ds-nav__lang:hover {
  background: var(--blue-100);
}

/* Footer */
.ds-footer {
  border-top: 1px solid var(--line-light);
  padding: var(--ds-space-8) 0;
  margin-top: var(--ds-space-10);
  background: var(--surface);
}
.ds-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 2fr);
  gap: var(--ds-space-8);
}
.ds-footer__nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--ds-space-6);
}
.ds-footer__col {
  display: flex;
  flex-direction: column;
  gap: var(--ds-space-3);
  font-size: 14px;
}
.ds-footer__col strong {
  color: var(--text-strong);
  font-size: 14px;
}
.ds-footer__col a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}
.ds-footer__col a:hover {
  color: var(--blue-700);
}

@media (max-width: 980px) {
  .ds-footer__inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .ds-menu-toggle {
    display: block;
    z-index: 51;
  }
  .ds-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--surface);
    flex-direction: column;
    align-items: flex-start;
    padding: 90px var(--ds-space-5) var(--ds-space-5);
    z-index: 45;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
  }
  .ds-nav.is-open {
    transform: translateX(0);
  }
  .ds-nav__list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    margin-bottom: var(--ds-space-6);
  }
  .ds-nav__item {
    width: 100%;
    border-bottom: 1px solid var(--line-light);
  }
  .ds-nav__link {
    width: 100%;
    padding: var(--ds-space-4) 0;
    font-size: 18px;
    justify-content: space-between;
  }
  .ds-nav__dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    background: transparent;
    padding: 0 0 var(--ds-space-4);
    display: none;
  }
  .ds-nav__dropdown-toggle[aria-expanded="true"] + .ds-nav__dropdown {
    display: block;
  }
  .ds-nav__dropdown-link {
    padding: 10px 0;
    font-size: 16px;
  }
  .ds-nav__actions {
    flex-direction: column;
    width: 100%;
    gap: var(--ds-space-4);
  }
  .ds-btn {
    width: 100%;
  }
}