/* ===== DESIGN TOKENS ===== */
:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Fonts */
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* ===== COLOR SYSTEM — Defense / Institutional ===== */
:root, [data-theme="light"] {
  --color-bg:             #f5f6f8;
  --color-surface:        #ffffff;
  --color-surface-2:      #eef0f4;
  --color-surface-offset: #e4e7ed;
  --color-divider:        #d1d5de;
  --color-border:         #c4c9d4;

  --color-text:           #1a1e2e;
  --color-text-muted:     #5c6478;
  --color-text-faint:     #9aa0b0;

  --color-primary:        #2c5282;
  --color-primary-hover:  #1e3a5f;
  --color-primary-active: #162d4a;

  --color-accent:         #3182ce;

  --shadow-sm: 0 1px 2px rgba(26, 30, 46, 0.06);
  --shadow-md: 0 4px 12px rgba(26, 30, 46, 0.08);
  --shadow-lg: 0 12px 32px rgba(26, 30, 46, 0.12);
}

[data-theme="dark"] {
  --color-bg:             #0f1219;
  --color-surface:        #171b26;
  --color-surface-2:      #1e2333;
  --color-surface-offset: #252b3d;
  --color-divider:        #2d3548;
  --color-border:         #3a4359;

  --color-text:           #d8dce6;
  --color-text-muted:     #8891a5;
  --color-text-faint:     #5c6478;

  --color-primary:        #5a9bd5;
  --color-primary-hover:  #7ab3e6;
  --color-primary-active: #3d7db8;

  --color-accent:         #63b3ed;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0f1219;
    --color-surface:        #171b26;
    --color-surface-2:      #1e2333;
    --color-surface-offset: #252b3d;
    --color-divider:        #2d3548;
    --color-border:         #3a4359;
    --color-text:           #d8dce6;
    --color-text-muted:     #8891a5;
    --color-text-faint:     #5c6478;
    --color-primary:        #5a9bd5;
    --color-primary-hover:  #7ab3e6;
    --color-primary-active: #3d7db8;
    --color-accent:         #63b3ed;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.4);
  }
}

/* ===== LAYOUT ===== */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container--narrow {
  max-width: var(--content-default);
}

/* ===== HEADER ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
  transition: box-shadow 0.3s var(--ease-out);
}

.header--scrolled {
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.logo__mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.logo__text {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color var(--transition-interactive);
}

.nav__link:hover {
  color: var(--color-text);
}

.theme-toggle {
  padding: var(--space-2);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive);
  border-radius: var(--radius-sm);
}

.theme-toggle:hover {
  color: var(--color-text);
}

/* Mobile nav */
.nav__toggle {
  display: none;
  padding: var(--space-2);
  color: var(--color-text);
}

@media (max-width: 768px) {
  .nav__toggle { display: block; }
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    flex-direction: column;
    gap: var(--space-4);
    box-shadow: var(--shadow-md);
  }
  .nav__links.active {
    display: flex;
  }
  .nav__link {
    font-size: var(--text-base);
    padding: var(--space-2) 0;
  }
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-bg);
}

.hero__bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero__grid {
  position: absolute;
  inset: 0;
  opacity: 0.06;
  background-image:
    linear-gradient(var(--color-primary) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-primary) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* Animated nodes */
.hero__nodes {
  position: absolute;
  inset: 0;
}

.hero__node {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  opacity: 0.2;
}

.hero__node--pulse {
  animation: node-pulse 3s ease-in-out infinite;
}

@keyframes node-pulse {
  0%, 100% { opacity: 0.15; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.8); }
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-16) var(--space-4);
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}

.hero__eyebrow::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  max-width: 18ch;
}

.hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: #ffffff;
  background: var(--color-primary);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background var(--transition-interactive),
              transform var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.hero__cta:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.hero__cta:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* ===== METRICS BAR ===== */
.metrics {
  background: var(--color-surface);
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.06);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.06);
  padding-block: var(--space-8);
}

.metrics__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
  text-align: center;
}

.metric__value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.metric__label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

@media (max-width: 768px) {
  .metrics__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }
}

/* ===== SECTIONS ===== */
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

.section--alt {
  background: var(--color-surface);
}

.section__eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  line-height: 1.7;
  margin-bottom: var(--space-10);
}

/* ===== CAPABILITIES ===== */
.capabilities__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}

.capability {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

.section--alt .capability {
  background: var(--color-bg);
}

.capability:first-child {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}

.capability__icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  stroke-width: 1.5;
}

.capability__title {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.capability__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.capability__visual {
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  position: relative;
  overflow: hidden;
}

@media (max-width: 768px) {
  .capabilities__grid {
    grid-template-columns: 1fr;
  }
  .capability:first-child {
    grid-template-columns: 1fr;
  }
}

/* ===== APPROACH (Past Performance) ===== */
.approach__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.approach__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.approach__item {
  display: flex;
  gap: var(--space-4);
}

.approach__number {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-primary);
  opacity: 0.4;
  flex-shrink: 0;
  line-height: 1;
  padding-top: var(--space-1);
}

.approach__item-title {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.approach__item-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.approach__sidebar {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.approach__sidebar-title {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.approach__tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin: 0 var(--space-1) var(--space-2) 0;
}

@media (max-width: 768px) {
  .approach__grid {
    grid-template-columns: 1fr;
  }
}

/* ===== ABOUT ===== */
.about__grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.about__text {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.8;
}

.about__text p + p {
  margin-top: var(--space-4);
}

.about__detail {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.about__detail-item {
  padding-block: var(--space-4);
}

.about__detail-item + .about__detail-item {
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.06);
}

.about__detail-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.about__detail-value {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 500;
}

@media (max-width: 768px) {
  .about__grid {
    grid-template-columns: 1fr;
  }
}

/* ===== CONTACT ===== */
.contact {
  background: var(--color-surface-2);
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.06);
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.contact__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.contact__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-4) var(--space-6);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition-interactive),
              transform var(--transition-interactive),
              border-color var(--transition-interactive);
}

.contact__link:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  border-color: oklch(from var(--color-text) l c h / 0.15);
}

.contact__link:active {
  transform: translateY(0);
}

.contact__link-icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact__link-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 400;
}

@media (max-width: 768px) {
  .contact__inner {
    grid-template-columns: 1fr;
  }
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-bg);
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.06);
  padding-block: var(--space-8);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.footer__text {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__link {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.footer__link:hover {
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .footer__inner {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }
}

/* ===== SCROLL REVEAL ===== */
.fade-in { opacity: 1; }

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}

/* ===== CAPABILITY DIAGRAM (SVG Animation) ===== */
.eval-diagram {
  width: 100%;
  max-width: 360px;
}

.eval-diagram .node {
  fill: var(--color-primary);
  opacity: 0.15;
}

.eval-diagram .node--active {
  opacity: 0.6;
  animation: diagram-pulse 2.5s ease-in-out infinite;
}

.eval-diagram .link {
  stroke: var(--color-primary);
  stroke-width: 1;
  opacity: 0.15;
}

.eval-diagram .link--active {
  opacity: 0.4;
  animation: link-flow 3s ease-in-out infinite;
}

@keyframes diagram-pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.7; }
}

@keyframes link-flow {
  0%, 100% { opacity: 0.15; stroke-dashoffset: 20; }
  50% { opacity: 0.5; stroke-dashoffset: 0; }
}