/* NeuroEdCon AI — Design System V1 */
:root {
  --color-navy: #0F172A;
  --color-navy-light: #1E293B;
  --color-blue: #2563EB;
  --color-cyan: #06B6D4;
  --color-purple: #7C3AED;
  --color-white: #FFFFFF;
  --color-gray-50: #F8FAFC;
  --color-gray-100: #F1F5F9;
  --color-gray-200: #E2E8F0;
  --color-gray-300: #CBD5E1;
  --color-gray-400: #94A3B8;
  --color-gray-500: #64748B;
  --color-gray-600: #475569;
  --gradient-hero: linear-gradient(135deg, #0F172A 0%, #1E3A5F 50%, #1a1040 100%);
  --gradient-cta: linear-gradient(135deg, #2563EB 0%, #7C3AED 100%);
  --gradient-accent: linear-gradient(135deg, #2563EB, #06B6D4);
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --container-max: 1200px;
  --header-height: 72px;
  --transition: 0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-gray-600);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--color-blue); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-purple); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 2px;
}
h1, h2, h3, h4 { color: var(--color-navy); line-height: 1.2; margin: 0 0 var(--space-sm); }
h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); font-weight: 700; }
h3 { font-size: clamp(1.125rem, 2vw, 1.375rem); font-weight: 600; }
p { margin: 0 0 var(--space-sm); }
ul { margin: 0; padding: 0; }
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 9999;
  background: var(--color-blue); color: var(--color-white); padding: var(--space-xs) var(--space-sm);
}
.skip-link:focus { left: var(--space-sm); top: var(--space-sm); }
.container {
  width: 100%; max-width: var(--container-max); margin: 0 auto;
  padding: 0 var(--space-md);
}
.section { padding: var(--space-3xl) 0; }
.section--gray { background: var(--color-gray-50); }
.section--dark { background: var(--color-navy); color: var(--color-gray-300); }
.section--dark h2, .section--dark h3 { color: var(--color-white); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-200);
  height: var(--header-height);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-height); gap: var(--space-md);
}
.logo { display: inline-flex; align-items: center; gap: 0.625rem; text-decoration: none; }
.logo__mark { flex-shrink: 0; }
.logo__text { font-size: 1.125rem; font-weight: 700; color: var(--color-navy); white-space: nowrap; }
.logo__accent { color: var(--color-blue); }
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.nav-toggle__bar { display: block; width: 24px; height: 2px; background: var(--color-navy); transition: var(--transition); }
.nav { display: flex; align-items: center; gap: var(--space-md); }
.nav__links { display: flex; align-items: center; gap: 0.25rem; flex-wrap: wrap; }
.nav__link {
  padding: 0.5rem 0.75rem; font-size: 0.875rem; font-weight: 500;
  color: var(--color-gray-600); border-radius: var(--radius-sm); transition: var(--transition);
}
.nav__link:hover, .nav__link--active { color: var(--color-blue); background: var(--color-gray-50); }
.nav__cta { white-space: nowrap; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.75rem 1.5rem; font-size: 0.9375rem; font-weight: 600;
  border-radius: var(--radius-md); border: 2px solid transparent;
  cursor: pointer; transition: var(--transition); text-decoration: none; line-height: 1.4;
}
.btn--primary { background: var(--color-blue); color: var(--color-white); border-color: var(--color-blue); }
.btn--primary:hover { background: #1D4ED8; border-color: #1D4ED8; color: var(--color-white); }
.btn--outline { background: transparent; color: var(--color-blue); border-color: var(--color-blue); }
.btn--outline:hover { background: var(--color-blue); color: var(--color-white); }
.btn--white { background: var(--color-white); color: var(--color-blue); border-color: var(--color-white); }
.btn--white:hover { background: var(--color-gray-50); color: var(--color-navy); }
.btn--sm { padding: 0.5rem 1rem; font-size: 0.875rem; }
.btn--full { width: 100%; }
.card__btn { margin-top: auto; }

/* Hero */
.hero {
  background: var(--gradient-hero); color: var(--color-gray-200);
  padding: var(--space-3xl) 0; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 70% 30%, rgba(37, 99, 235, 0.15) 0%, transparent 60%);
  pointer-events: none;
}
.hero--page { padding: var(--space-2xl) 0; }
.hero__inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-xl);
  align-items: center; position: relative;
}
.hero__title { color: var(--color-white); margin-bottom: var(--space-md); }
.hero__subtitle { font-size: 1.125rem; color: var(--color-gray-300); max-width: 540px; margin-bottom: var(--space-lg); }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.hero .btn--outline { color: var(--color-white); border-color: rgba(255, 255, 255, 0.4); }
.hero .btn--outline:hover { background: rgba(255, 255, 255, 0.1); color: var(--color-white); border-color: var(--color-white); }
.hero__visual svg { width: 100%; max-width: 500px; margin: 0 auto; }

/* Section Header */
.section-header { text-align: center; max-width: 720px; margin: 0 auto var(--space-xl); }
.section-header--left { text-align: left; margin-left: 0; }
.section-header__eyebrow {
  display: inline-block; font-size: 0.8125rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--color-blue); margin-bottom: var(--space-xs);
}
.section-header__title { margin-bottom: var(--space-sm); }
.section-header__desc { font-size: 1.0625rem; color: var(--color-gray-500); }

/* Cards Grid */
.grid { display: grid; gap: var(--space-md); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--color-white); border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg); padding: var(--space-lg);
  box-shadow: var(--shadow-sm); transition: var(--transition);
  display: flex; flex-direction: column;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: var(--color-gray-300); }
.card__icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  background: var(--color-gray-50); margin-bottom: var(--space-sm);
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(37,99,235,0.1), rgba(6,182,212,0.1));
  position: relative;
}
.card__icon::after {
  content: ''; width: 20px; height: 20px; border-radius: 4px;
  background: var(--gradient-accent); opacity: 0.8;
}
.card__title { margin-bottom: var(--space-xs); }
.card__text { color: var(--color-gray-500); font-size: 0.9375rem; flex-grow: 1; }
.card__list { list-style: none; margin: var(--space-sm) 0; padding: 0; }
.card__list li {
  padding: 0.25rem 0 0.25rem 1.25rem; position: relative;
  font-size: 0.875rem; color: var(--color-gray-600);
}
.card__list li::before {
  content: ''; position: absolute; left: 0; top: 0.65rem;
  width: 6px; height: 6px; border-radius: 50%; background: var(--color-cyan);
}
.card__list--muted li { color: var(--color-gray-500); }
.card__label { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-gray-400); margin-top: var(--space-sm); }
.card__top { margin-bottom: var(--space-xs); }
.card__meta { font-size: 0.8125rem; color: var(--color-gray-400); font-style: italic; }
.card--compact .card__text { font-size: 0.875rem; }
.card--blog .card__title a { color: var(--color-navy); }
.card--blog .card__title a:hover { color: var(--color-blue); }

/* Badge */
.badge {
  display: inline-block; padding: 0.25rem 0.75rem; font-size: 0.75rem;
  font-weight: 600; border-radius: 999px; background: var(--color-gray-100);
  color: var(--color-gray-600);
}
.badge--level { background: rgba(37, 99, 235, 0.1); color: var(--color-blue); }
.badge--category { background: rgba(124, 58, 237, 0.1); color: var(--color-purple); margin-bottom: var(--space-sm); }

/* CTA */
.cta { padding: var(--space-3xl) 0; text-align: center; }
.cta--gradient { background: var(--gradient-cta); color: var(--color-white); }
.cta__inner { max-width: 640px; margin: 0 auto; }
.cta__title { color: var(--color-white); margin-bottom: var(--space-sm); }
.cta__desc { font-size: 1.0625rem; opacity: 0.9; margin-bottom: var(--space-lg); }

/* Breadcrumb */
.breadcrumb { padding: var(--space-md) 0 0; }
.breadcrumb__list { display: flex; flex-wrap: wrap; gap: 0.5rem; list-style: none; font-size: 0.875rem; }
.breadcrumb__item + .breadcrumb__item::before { content: '/'; margin-right: 0.5rem; color: var(--color-gray-400); }
.breadcrumb__item a { color: var(--color-gray-500); }
.breadcrumb__item span { color: var(--color-navy); font-weight: 500; }

/* Forms */
.form { display: flex; flex-direction: column; gap: var(--space-md); }
.form__group { display: flex; flex-direction: column; gap: 0.375rem; }
.form__group label { font-size: 0.875rem; font-weight: 600; color: var(--color-navy); }
.form__group input, .form__group select, .form__group textarea {
  padding: 0.75rem 1rem; font-size: 1rem; font-family: inherit;
  border: 1px solid var(--color-gray-300); border-radius: var(--radius-md);
  background: var(--color-white); transition: var(--transition);
}
.form__group input:focus, .form__group select:focus, .form__group textarea:focus {
  border-color: var(--color-blue); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.form__note { font-size: 0.8125rem; color: var(--color-gray-400); margin: 0; }
.form__alert {
  padding: var(--space-sm) var(--space-md); border-radius: var(--radius-md);
  font-size: 0.9375rem; margin-bottom: var(--space-md);
}
.form__alert--success { background: #ECFDF5; color: #065F46; border: 1px solid #A7F3D0; }
.form__alert--error { background: #FEF2F2; color: #991B1B; border: 1px solid #FECACA; }

/* FAQ */
.faq { max-width: 800px; margin: 0 auto; }
.faq__item { border-bottom: 1px solid var(--color-gray-200); }
.faq__question {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-md) 0; background: none; border: none; cursor: pointer;
  font-size: 1rem; font-weight: 600; color: var(--color-navy); text-align: left;
  font-family: inherit;
}
.faq__icon {
  width: 20px; height: 20px; position: relative; flex-shrink: 0; margin-left: var(--space-sm);
}
.faq__icon::before, .faq__icon::after {
  content: ''; position: absolute; background: var(--color-blue);
  transition: var(--transition);
}
.faq__icon::before { width: 14px; height: 2px; top: 9px; left: 3px; }
.faq__icon::after { width: 2px; height: 14px; top: 3px; left: 9px; }
.faq__question[aria-expanded="true"] .faq__icon::after { transform: rotate(90deg); opacity: 0; }
.faq__answer { padding: 0 0 var(--space-md); color: var(--color-gray-500); }
.faq__answer[hidden] { display: none; }

/* Content blocks */
.intro { max-width: 800px; margin: 0 auto; text-align: center; }
.intro p { font-size: 1.0625rem; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-xl); align-items: start; }
.values-list { list-style: none; display: grid; gap: var(--space-sm); }
.values-list li {
  padding: var(--space-md); background: var(--color-gray-50);
  border-radius: var(--radius-md); border-left: 3px solid var(--color-blue);
}
.values-list strong { display: block; color: var(--color-navy); margin-bottom: 0.25rem; }
.placeholder-box {
  padding: var(--space-xl); background: var(--color-gray-50);
  border: 2px dashed var(--color-gray-300); border-radius: var(--radius-lg);
  text-align: center; color: var(--color-gray-500);
}
.placeholder-tag { font-size: 0.75rem; color: var(--color-gray-400); }
.architecture-diagram { margin: var(--space-lg) 0; }
.architecture-diagram svg { width: 100%; max-width: 700px; margin: 0 auto; }

/* Consulting list */
.consulting-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-md); list-style: none; }
.consulting-list li {
  padding: var(--space-md); background: var(--color-white);
  border: 1px solid var(--color-gray-200); border-radius: var(--radius-md);
  display: flex; align-items: flex-start; gap: var(--space-sm);
}
.consulting-list li::before {
  content: ''; flex-shrink: 0; width: 8px; height: 8px;
  margin-top: 0.5rem; border-radius: 50%; background: var(--gradient-accent);
}

/* Footer */
.site-footer { background: var(--color-navy); color: var(--color-gray-400); padding-top: var(--space-2xl); }
.site-footer a { color: var(--color-gray-300); }
.site-footer a:hover { color: var(--color-white); }
.site-footer .logo__text { color: var(--color-white); }
.site-footer__grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: var(--space-xl);
  padding-bottom: var(--space-xl);
}
.site-footer__tagline { margin: var(--space-sm) 0; font-size: 0.9375rem; }
.site-footer__heading { color: var(--color-white); font-size: 0.875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--space-sm); }
.site-footer__nav ul, .site-footer__social ul { list-style: none; }
.site-footer__nav li, .site-footer__social li { margin-bottom: 0.5rem; }
.site-footer__location { margin-top: var(--space-md); font-size: 0.875rem; }
.site-footer__bottom { border-top: 1px solid var(--color-navy-light); padding: var(--space-md) 0; font-size: 0.875rem; }

/* Page hero variant */
.page-hero {
  background: var(--color-gray-50); padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--color-gray-200);
}
.page-hero__title { margin-bottom: var(--space-sm); }
.page-hero__desc { font-size: 1.0625rem; color: var(--color-gray-500); max-width: 640px; }

/* Contact layout */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: var(--space-xl); align-items: start; }
.contact-info { display: flex; flex-direction: column; gap: var(--space-md); }
.contact-info__item { padding: var(--space-md); background: var(--color-gray-50); border-radius: var(--radius-md); }
.contact-info__item strong { display: block; color: var(--color-navy); margin-bottom: 0.25rem; }

/* Training cards */
.training-card {
  background: var(--color-white); border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg); padding: var(--space-lg);
  transition: var(--transition);
}
.training-card:hover { border-color: var(--color-blue); box-shadow: var(--shadow-md); }
.training-card h3 { margin-bottom: var(--space-xs); }
.training-card p { font-size: 0.9375rem; color: var(--color-gray-500); margin: 0; }

/* Responsive */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { order: -1; max-width: 400px; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed; top: var(--header-height); left: 0; right: 0;
    background: var(--color-white); flex-direction: column; align-items: stretch;
    padding: var(--space-md); border-bottom: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-lg); transform: translateY(-120%); opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease; pointer-events: none;
  }
  .nav--open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav__links { flex-direction: column; align-items: stretch; }
  .nav__link { padding: 0.75rem 1rem; }
  .nav__cta { text-align: center; margin-top: var(--space-sm); }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .consulting-list { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr; }
  .section { padding: var(--space-2xl) 0; }
  .hero { padding: var(--space-2xl) 0; }
}
@media (max-width: 320px) {
  .container { padding: 0 var(--space-sm); }
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; }
}