/* ==========================================================================
   Operations Management System — styles.css
   ========================================================================== */

:root {
  --color-navy-900: #0b1a2e;
  --color-navy-800: #10233c;
  --color-navy-700: #16304f;
  --color-charcoal: #2b3341;
  --color-charcoal-light: #5a6472;
  --color-white: #ffffff;
  --color-off-white: #f6f7f9;
  --color-border: #e2e5ea;
  --color-blue-accent: #3b6ea5;
  --color-blue-accent-light: #eaf1f8;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";

  --max-width: 1160px;
  --max-width-narrow: 760px;

  --radius-sm: 6px;
  --radius-md: 10px;

  --transition-fast: 150ms ease;
  --transition-base: 220ms ease;
}

/* ---- Reset ---- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-charcoal);
  background: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-navy-900);
}

p {
  margin: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ---- Accessibility helpers ---- */
.visually-hidden {
  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;
  left: 1rem;
  top: -3rem;
  background: var(--color-navy-900);
  color: var(--color-white);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

:focus-visible {
  outline: 2px solid var(--color-blue-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---- Layout helpers ---- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section {
  padding: 88px 0;
}

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

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-blue-accent);
  margin: 0 0 14px;
}

.section h2 {
  font-size: clamp(1.6rem, 1.3rem + 1.2vw, 2.25rem);
  margin-bottom: 20px;
}

.section-lede {
  font-size: 1.125rem;
  color: var(--color-charcoal-light);
  max-width: 640px;
  margin-bottom: 16px;
}

.section p + p {
  margin-top: 16px;
}

.section .btn {
  margin-top: 8px;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--color-navy-900);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-navy-700);
}

.btn-secondary {
  background: transparent;
  color: var(--color-navy-900);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-navy-900);
  background: var(--color-off-white);
}

.btn-block {
  width: 100%;
}

.btn-header {
  display: none;
}

/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  color: var(--color-navy-900);
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  display: flex;
  align-items: center;
}

.logo-img {
  height: 40px;
  width: auto;
  display: block;
}

.main-nav ul {
  display: flex;
  gap: 36px;
}

.main-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-charcoal);
  padding: 8px 2px;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.main-nav a:hover {
  color: var(--color-navy-900);
  border-bottom-color: var(--color-blue-accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

/* Mobile nav toggle */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  color: var(--color-navy-900);
  padding: 0;
}

.nav-toggle-box {
  position: relative;
  width: 22px;
  height: 16px;
  display: block;
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base);
}

.nav-toggle-bar {
  top: 7px;
}

.nav-toggle-bar::before {
  top: -7px;
}

.nav-toggle-bar::after {
  top: 7px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar::before {
  top: 0;
  transform: rotate(45deg);
  background: var(--color-navy-900);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after {
  top: 0;
  transform: rotate(-45deg);
  background: var(--color-navy-900);
}

.mobile-nav {
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 20px 24px 28px;
}

.mobile-nav ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 20px;
}

.mobile-nav a {
  display: block;
  padding: 12px 4px;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-navy-900);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav[hidden] {
  display: none;
}

/* ---- Hero ---- */
.hero {
  background: linear-gradient(180deg, var(--color-navy-900) 0%, var(--color-navy-800) 100%);
  color: var(--color-white);
  padding: 96px 0 100px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 48px;
}

.hero-content h1 {
  color: var(--color-white);
  font-size: clamp(2.1rem, 1.6rem + 2.4vw, 3.4rem);
  line-height: 1.12;
  margin-bottom: 24px;
}

.hero-lede {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.78);
  max-width: 520px;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero .btn-primary {
  background: var(--color-white);
  color: var(--color-navy-900);
}

.hero .btn-primary:hover {
  background: var(--color-blue-accent-light);
}

.hero .btn-secondary {
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.35);
}

.hero .btn-secondary:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.06);
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-svg {
  width: 100%;
  max-width: 420px;
  color: var(--color-white);
}

/* ---- Focus grid ---- */
.focus-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 44px;
}

.focus-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.focus-card:hover {
  border-color: var(--color-blue-accent);
}

.focus-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-blue-accent-light);
  color: var(--color-blue-accent);
  margin-bottom: 20px;
}

.focus-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.focus-card p {
  color: var(--color-charcoal-light);
}

/* ---- Approach list ---- */
.approach-list {
  margin-top: 44px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.approach-list li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
}

.approach-list li:last-child {
  border-bottom: 1px solid var(--color-border);
}

.approach-number {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-blue-accent);
  letter-spacing: 0.02em;
}

.approach-list h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.approach-list p {
  color: var(--color-charcoal-light);
}

/* ---- Contact ---- */
.section-contact {
  background: var(--color-navy-900);
  color: var(--color-white);
}

.section-contact h2 {
  color: var(--color-white);
}

.section-contact .section-lede {
  color: rgba(255, 255, 255, 0.75);
}

.eyebrow-on-dark {
  color: #8fb7dd;
}

.contact-card {
  margin-top: 40px;
  background: var(--color-navy-800);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 36px;
  max-width: 480px;
}

.contact-email-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 18px;
}

.contact-email {
  font-size: 1.02rem;
  font-weight: 500;
  word-break: break-all;
}

.btn-copy {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--color-white);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.btn-copy:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-white);
}

.btn-copy svg {
  width: 16px;
  height: 16px;
}

.contact-note {
  margin-top: 16px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ---- Footer ---- */
.site-footer {
  background: var(--color-off-white);
  color: var(--color-charcoal-light);
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.logo-img-footer {
  height: 34px;
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--color-charcoal-light);
}

.footer-nav ul {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 0.9rem;
  color: var(--color-charcoal);
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--color-navy-900);
}

.footer-contact a {
  font-size: 0.9rem;
  color: var(--color-charcoal);
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.footer-contact a:hover {
  color: var(--color-navy-900);
  border-color: var(--color-navy-900);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (min-width: 981px) {
  .btn-header {
    display: inline-flex;
  }

  .nav-toggle {
    display: none;
  }

  .mobile-nav {
    display: none !important;
  }
}

@media (max-width: 980px) {
  .main-nav {
    display: none;
  }

  .btn-header {
    display: none;
  }
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .hero-visual {
    order: -1;
  }

  .hero-svg {
    max-width: 300px;
    margin: 0 auto;
  }
}

@media (max-width: 480px) {
  .logo-img {
    height: 32px;
  }
}

@media (max-width: 720px) {
  .section {
    padding: 64px 0;
  }

  .hero {
    padding: 56px 0 64px;
  }

  .focus-grid {
    grid-template-columns: 1fr;
  }

  .approach-list li {
    grid-template-columns: 1fr;
    gap: 8px;
  }

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

  .contact-card {
    padding: 24px;
    max-width: 100%;
  }

  .contact-email-row {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-copy {
    justify-content: center;
  }
}

@media (max-width: 420px) {
  .container {
    padding: 0 18px;
  }
}