/* ============================================
   NKCX — Brand Stylesheet (Dark Mode)
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Primary */
  --color-primary: #4AABBD;
  --color-primary-muted: #3A8E9D;

  /* Accent */
  --color-accent: #4AABBD;
  --color-accent-light: #6BC4D4;
  --color-accent-dark: #2E8B9A;

  /* Dark Backgrounds */
  --color-bg-deep: #0C1321;
  --color-bg: #111B2E;
  --color-bg-raised: #162236;
  --color-bg-card: #1A2842;
  --color-bg-card-hover: #1F3050;

  /* Text — generous contrast for serif legibility on dark backgrounds */
  --color-text: #DCE2EB;           /* 11:1 on bg-deep */
  --color-text-bright: #F2F4F8;    /* 13:1 on bg-deep */
  --color-text-muted: #B8C0CE;     /* 8:1 on bg-card */
  --color-text-faint: #97A1B3;     /* 5.7:1 on bg-deep */

  /* Borders */
  --color-border: #243351;
  --color-border-light: #1E2C45;

  /* Status */
  --color-success: #3DAA6E;
  --color-warning: #D4A347;
  --color-error: #D45757;

  /* Typography */
  --font-heading: 'EB Garamond', 'Georgia', serif;
  --font-body: 'Gelasio', 'Georgia', serif;
  --font-ui: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --max-width: 1140px;
  --max-width-narrow: 780px;
  --nav-height: 72px;
  --border-radius: 6px;
  --border-radius-lg: 10px;

  /* Transitions */
  --transition: 200ms ease;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover,
a:focus-visible {
  color: var(--color-accent-light);
}

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

ul, ol {
  list-style: none;
}

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

/* --- Typography --- */
h1, h2, h3, h4 {
  color: var(--color-text-bright);
  font-family: var(--font-heading);
  font-weight: 500;
  line-height: 1.25;
}

h1 {
  font-size: 3rem;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 2.25rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.1875rem;
}

p + p {
  margin-top: var(--space-md);
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1.125rem;
  line-height: 1.7;
  max-width: 600px;
}

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

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

section {
  padding: var(--space-4xl) 0;
}

.section-header {
  margin-bottom: var(--space-2xl);
}

.section-header--center {
  text-align: center;
}

.section-header--center .section-subtitle {
  margin: var(--space-md) auto 0;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.85rem 2rem;
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1;
  border-radius: var(--border-radius);
  transition: background-color var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn--primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-weight: 700;
}

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

.btn--secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}

.btn--secondary:hover {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

.btn--ghost {
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--color-text-bright);
  border: 1.5px solid rgba(255, 255, 255, 0.15);
}

.btn--ghost:hover {
  background-color: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.25);
  color: #FFFFFF;
}

.btn--small {
  padding: 0.65rem 1.5rem;
  font-size: 0.75rem;
}

/* --- Navigation --- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(12, 19, 33, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  height: var(--nav-height);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  height: 36px;
}

.nav-logo img {
  height: 32px;
  width: auto;
  filter: brightness(0) invert(1);
  font-size: 0;  /* hide alt text before image loads */
}

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

.nav-links a:not(.btn) {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition);
}

.nav-links a:not(.btn):hover {
  color: #FFFFFF;
}

.nav-links a:not(.btn).active {
  color: #FFFFFF;
}

.nav-links a:not(.btn).active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

.nav-cta {
  margin-left: var(--space-sm);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  z-index: 110;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-bright);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero --- */
.hero {
  position: relative;
  padding: calc(var(--nav-height) + var(--space-4xl)) 0 var(--space-4xl);
  background-color: var(--color-bg-deep);
  overflow: hidden;
  min-height: 85vh;
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(12,19,33,0.4) 0%, rgba(12,19,33,0.95) 100%);
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 660px;
}

.hero-tagline {
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}

.hero h1 {
  color: #FFFFFF;
  font-size: 3.25rem;
  margin-bottom: var(--space-lg);
  line-height: 1.15;
}

.hero-description {
  font-size: 1.1875rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: var(--space-2xl);
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* --- Cards --- */
.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-2xl);
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.card:hover {
  background-color: var(--color-bg-card-hover);
  border-color: var(--color-accent-dark);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.card-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(74, 171, 189, 0.1);
  border: 1px solid rgba(74, 171, 189, 0.2);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-lg);
  color: var(--color-accent);
}

.card-icon svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 1.75;
  fill: none;
}

.card h3 {
  margin-bottom: var(--space-sm);
}

.card p {
  color: var(--color-text);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.card-link:hover {
  gap: var(--space-sm);
}

.card-link svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

/* --- Grid Layouts --- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

/* --- Services Section --- */
.services {
  background-color: var(--color-bg);
}

/* --- Industries Section --- */
.industries {
  background-color: var(--color-bg-deep);
}

.industries-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-lg);
  text-align: center;
}

.industry-item {
  padding: var(--space-xl) var(--space-md);
  background-color: var(--color-bg-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  transition: border-color var(--transition), background-color var(--transition);
}

.industry-item:hover {
  border-color: var(--color-accent-dark);
  background-color: var(--color-bg-card);
}

.industry-item svg {
  width: 32px;
  height: 32px;
  stroke: var(--color-accent);
  stroke-width: 1.5;
  fill: none;
  margin: 0 auto var(--space-md);
}

.industry-item h4 {
  font-size: 0.9375rem;
  color: var(--color-text);
}

/* --- Education Preview --- */
.education-preview {
  background-color: var(--color-bg);
  position: relative;
}

.module-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm) var(--space-xl);
  margin: var(--space-xl) 0 var(--space-2xl);
}

.module-list li {
  padding: var(--space-sm) 0;
  color: var(--color-text);
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
}

.module-list li::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
  flex-shrink: 0;
  position: relative;
  top: -2px;
}

.module-number {
  color: var(--color-text-faint);
  font-size: 0.875rem;
  font-weight: 600;
  min-width: 1.5em;
}

/* --- Section Divider --- */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--color-border) 50%, transparent 100%);
  margin: 0;
}

/* --- Projects Section --- */
.project-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-2xl);
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  background-color: var(--color-bg-card-hover);
  border-color: var(--color-accent-dark);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.project-card h3 {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
  color: #FFFFFF;
}

.project-card p {
  color: var(--color-text);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25em 0.75em;
  background-color: rgba(74, 171, 189, 0.08);
  color: var(--color-accent);
  border-radius: 100px;
  border: 1px solid rgba(74, 171, 189, 0.2);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.project-link:hover {
  color: var(--color-accent-light);
}

.project-link svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

/* --- Testimonials --- */
.testimonials {
  background-color: var(--color-bg-deep);
}

.testimonial-card {
  background-color: var(--color-bg-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-2xl);
}

.testimonial-card blockquote {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  font-style: italic;
  margin-bottom: var(--space-lg);
}

.testimonial-card blockquote::before {
  content: '\201C';
  display: block;
  font-size: 3.5rem;
  line-height: 1;
  color: var(--color-accent);
  font-style: normal;
  margin-bottom: var(--space-sm);
  opacity: 0.6;
}

.testimonial-author {
  font-size: 0.9375rem;
}

.testimonial-author strong {
  display: block;
  color: var(--color-text-bright);
  font-weight: 600;
}

.testimonial-author span {
  color: var(--color-text-faint);
}

/* --- About Section --- */
.about {
  background-color: var(--color-bg);
}

.about-content {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about-photo {
  width: 280px;
  height: 340px;
  border-radius: var(--border-radius-lg);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-faint);
  font-size: 0.875rem;
  overflow: hidden;
}

.about-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-text h3 {
  margin-bottom: var(--space-md);
  font-style: italic;
}

.about-text p {
  color: var(--color-text);
}

.about-links {
  display: flex;
  gap: var(--space-lg);
  margin-top: var(--space-md);
}

.about-links a {
  color: var(--color-accent-light);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
}

.about-links a:hover {
  text-decoration: underline;
}

/* --- Contact / CTA --- */
.contact-cta {
  position: relative;
  background-color: var(--color-bg-deep);
  text-align: center;
  overflow: hidden;
}

.contact-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(74, 171, 189, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.contact-cta .container {
  position: relative;
  z-index: 1;
}

.contact-cta h2 {
  color: #FFFFFF;
}

.contact-cta p {
  color: var(--color-text);
  font-size: 1.0625rem;
  margin: var(--space-md) auto var(--space-2xl);
  max-width: 520px;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.contact-links a {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  transition: color var(--transition);
}

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

/* --- Site Footer --- */
.site-footer {
  background-color: var(--color-bg-deep);
  color: var(--color-text-faint);
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border-light);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-links a {
  font-family: var(--font-ui);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}

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

.footer-copy {
  font-family: var(--font-ui);
  font-size: 0.8125rem;
}

/* --- Page Hero (Interior pages) --- */
.page-hero {
  position: relative;
  padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-3xl);
  background-color: var(--color-bg-deep);
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(74, 171, 189, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  color: #FFFFFF;
  margin-bottom: var(--space-md);
}

.page-hero p {
  color: var(--color-text);
  font-size: 1.125rem;
  max-width: 640px;
}

/* --- Education Module Cards --- */
.module-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  transition: border-color var(--transition), background-color var(--transition);
}

.module-card:hover {
  border-color: var(--color-accent-dark);
  background-color: var(--color-bg-card-hover);
}

.module-card-number {
  font-family: var(--font-ui);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}

.module-card h3 {
  font-size: 1.1875rem;
  margin-bottom: var(--space-sm);
}

.module-card p {
  color: var(--color-text);
}

/* --- Callout --- */
.callout {
  background-color: var(--color-bg-card);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--border-radius-lg) var(--border-radius-lg) 0;
  padding: var(--space-xl) var(--space-2xl);
}

.callout h3 {
  margin-bottom: var(--space-sm);
}

.callout p {
  color: var(--color-text);
}

/* --- Registration Placeholder --- */
.registration-section {
  background-color: var(--color-bg);
  text-align: center;
}

/* --- Projects Grid --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

/* --- Decorative line --- */
.accent-line {
  width: 48px;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: 2px;
  margin-bottom: var(--space-lg);
}

.section-header--center .accent-line {
  margin-left: auto;
  margin-right: auto;
}

/* --- Responsive --- */
@media (max-width: 1199px) {
  .industries-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 767px) {
  :root {
    --space-4xl: 3.5rem;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .hero {
    min-height: auto;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  /* Nav mobile */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    flex-direction: column;
    align-items: flex-start;
    background-color: var(--color-bg-raised);
    padding: calc(var(--nav-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.3);
    transform: translateX(100%);
    transition: transform 300ms ease;
    gap: var(--space-md);
    border-left: 1px solid var(--color-border);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a:not(.btn) {
    font-size: 1.0625rem;
  }

  .nav-cta {
    margin-left: 0;
    margin-top: var(--space-md);
  }

  /* Grids */
  .grid-3,
  .grid-2,
  .projects-grid {
    grid-template-columns: 1fr;
  }

  .module-list {
    grid-template-columns: 1fr;
  }

  .industries-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-text h3 {
    text-align: center;
  }

  .about-photo {
    margin: 0 auto;
    width: 220px;
    height: 270px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .footer-links {
    justify-content: center;
  }

  .section-divider {
    margin: 0;
  }

  .contact-links {
    flex-direction: column;
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  .industries-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Skip to content (a11y) --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background-color: var(--color-accent);
  color: var(--color-bg-deep);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 0.875rem;
  z-index: 200;
}

.skip-link:focus {
  top: var(--space-md);
  color: var(--color-bg-deep);
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-center {
  text-align: center;
}