/*
 * Design Brief: Neurolynx ← inspired by https://www.neuralix.ai/
 *
 * Structure: hero-split → platform-statement → tabbed-industries →
 *            staggered-capabilities → process-pipeline → stats-impact → cta-band → footer-multi-column
 *
 * Hero: split 50/50, eyebrow + operational headline, abstract neural-flow visual
 * Palette: deep industrial charcoal + teal operational accent + warm lynx amber secondary
 * Typography: Syne display + DM Sans body — confident enterprise scale
 * Motion: fade-up reveals, subtle hover lifts, smooth 0.5s easing
 */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,400&family=Syne:wght@500;600;700;800&display=swap');

:root {
  /* Backgrounds — industrial dark with light alternating bands */
  --color-bg: #0a0f14;
  --color-bg-alt: #0e141c;
  --color-surface: #151d28;
  --color-surface-elevated: #1c2636;
  --color-surface-light: #eef1f5;
  --color-surface-light-alt: #e2e7ed;

  /* Text */
  --color-text: #e8ecf1;
  --color-text-muted: #8892a2;
  --color-text-dark: #141c28;
  --color-text-dark-muted: #5a6578;

  /* Accents — teal operational (Neuralix-inspired) + lynx amber */
  --color-accent: #00c4a7;
  --color-accent-hover: #00ddb8;
  --color-accent-muted: rgba(0, 196, 167, 0.12);
  --color-accent-warm: #d4920a;
  --color-accent-warm-hover: #e8a520;

  /* Borders & dividers */
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-light: rgba(20, 28, 40, 0.1);

  /* Typography */
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-pill: 999px;

  /* Spacing */
  --space-section: clamp(4rem, 8vw, 7rem);
  --space-grid: clamp(1.5rem, 3vw, 2.5rem);
  --container-max: 1200px;
  --container-wide: 1320px;

  /* Motion */
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-reveal: 0.65s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-modal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.25);
  --shadow-elevated: 0 12px 48px rgba(0, 0, 0, 0.35);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

.container {
  width: min(100% - 2.5rem, var(--container-max));
  margin-inline: auto;
}

.container--wide {
  width: min(100% - 2.5rem, var(--container-wide));
  margin-inline: auto;
}

/* ── Typography ── */
.eyebrow {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.section-title--dark {
  color: var(--color-text-dark);
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-top: 1rem;
}

.section-subtitle--dark {
  color: var(--color-text-dark-muted);
}

.section-header {
  margin-bottom: clamp(2rem, 4vw, 3.5rem);
}

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

.section-header--center .section-subtitle {
  margin-inline: auto;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background var(--transition-base), color var(--transition-base),
              border-color var(--transition-base), transform var(--transition-base),
              box-shadow var(--transition-base);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0, 196, 167, 0.3);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--warm {
  background: var(--color-accent-warm);
  color: var(--color-bg);
}

.btn--warm:hover {
  background: var(--color-accent-warm-hover);
  transform: translateY(-1px);
}

.btn--outline-dark {
  background: transparent;
  color: var(--color-text-dark);
  border: 1px solid var(--color-border-light);
}

.btn--outline-dark:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ── Header ── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-block: 1rem;
  transition: background var(--transition-base), box-shadow var(--transition-base),
              padding var(--transition-base);
}

.header.is-scrolled {
  background: rgba(10, 15, 20, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--color-border);
  padding-block: 0.75rem;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.header__logo img {
  height: 32px;
  width: auto;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.header__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.header__links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

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

.header__cta .btn {
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
}

.header__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
}

.header__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.header__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.header__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Hero (split) ── */
.hero {
  padding-top: calc(var(--space-section) + 3rem);
  padding-bottom: var(--space-section);
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 80% 40%, rgba(0, 196, 167, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 40% 30% at 10% 80%, rgba(212, 146, 10, 0.04) 0%, transparent 60%);
  pointer-events: none;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-grid);
  align-items: center;
  min-height: min(85vh, 820px);
  position: relative;
}

.hero__eyebrow {
  margin-bottom: 1.25rem;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5.5vw, 4rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero__title em {
  font-style: normal;
  color: var(--color-accent);
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.1875rem);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin-bottom: 0.75rem;
}

.hero__tagline {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  max-width: 44ch;
  margin-bottom: 2rem;
  padding-left: 1rem;
  border-left: 2px solid var(--color-accent);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero__visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__visual svg {
  width: 100%;
  max-width: 520px;
  height: auto;
}

/* ── Platform Overview (problem-statement) ── */
.platform {
  padding-block: var(--space-section);
  background: var(--color-surface-light);
  color: var(--color-text-dark);
}

.platform__inner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.platform__statement {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.125rem);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.platform__features {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.platform__feature {
  display: flex;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.platform__feature:hover {
  box-shadow: var(--shadow-card);
  transform: translateX(4px);
}

.platform__feature-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-muted);
  border-radius: var(--radius-md);
  color: var(--color-accent);
}

.platform__feature h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.platform__feature p {
  font-size: 0.875rem;
  color: var(--color-text-dark-muted);
  line-height: 1.55;
}

.platform__actions {
  margin-top: 2rem;
}

/* ── Capabilities (staggered grid) ── */
.capabilities {
  padding-block: var(--space-section);
  background: var(--color-bg-alt);
}

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

.capability-card {
  padding: 2rem 2rem 2rem 2.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.capability-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 0;
  background: var(--color-accent);
  transition: height var(--transition-base);
}

.capability-card:hover {
  border-color: rgba(0, 196, 167, 0.25);
  transform: translateY(-3px);
}

.capability-card:hover::before {
  height: 100%;
}

.capability-card:nth-child(even) {
  margin-top: 2rem;
}

.capability-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1.25rem;
  color: var(--color-accent);
}

.capability-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.625rem;
}

.capability-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ── Solutions (tabbed-industries) ── */
.solutions {
  padding-block: var(--space-section);
  background: var(--color-bg);
}

.solutions__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0;
}

.solutions__tab {
  padding: 0.875rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--transition-base), border-color var(--transition-base);
}

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

.solutions__tab.is-active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.solutions__panel {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: start;
  animation: fadeIn 0.4s ease;
}

.solutions__panel.is-active {
  display: grid;
}

.solutions__panel h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.solutions__panel > div > p {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.solutions__list li {
  display: flex;
  gap: 0.75rem;
  padding: 0.625rem 0;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.solutions__list li::before {
  content: '';
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  margin-top: 0.55rem;
  background: var(--color-accent);
  border-radius: 50%;
}

.solutions__visual {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.solutions__visual svg {
  width: 100%;
  max-width: 320px;
  opacity: 0.85;
}

.solutions__actions {
  margin-top: 2.5rem;
  text-align: center;
}

/* ── Technology (process-pipeline) ── */
.technology {
  padding-block: var(--space-section);
  background: var(--color-surface-light);
  color: var(--color-text-dark);
}

.technology__intro {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.technology__pipeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}

.technology__pipeline::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-warm));
  z-index: 0;
}

.pipeline-step {
  text-align: center;
  padding: 0 1rem;
  position: relative;
  z-index: 1;
}

.pipeline-step__number {
  width: 56px;
  height: 56px;
  margin-inline: auto;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  background: #fff;
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  color: var(--color-accent);
  transition: background var(--transition-base), color var(--transition-base);
}

.pipeline-step:hover .pipeline-step__number {
  background: var(--color-accent);
  color: #fff;
}

.pipeline-step h3 {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.625rem;
}

.pipeline-step p {
  font-size: 0.8125rem;
  color: var(--color-text-dark-muted);
  line-height: 1.55;
}

.technology__actions {
  text-align: center;
  margin-top: 3rem;
}

/* ── Impact Stats ── */
.impact {
  padding-block: var(--space-section);
  background: var(--color-bg-alt);
}

.impact__inner {
  text-align: center;
}

.impact__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-grid);
  margin-top: 3rem;
}

.stat-card {
  padding: 2rem 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.stat-card:hover {
  border-color: rgba(0, 196, 167, 0.3);
  transform: translateY(-4px);
}

.stat-card__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.stat-card__value {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1.1;
}

.stat-card__suffix {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 0.375rem;
}

/* ── CTA Band ── */
.cta-band {
  padding-block: var(--space-section);
  background: linear-gradient(135deg, var(--color-surface-elevated) 0%, var(--color-bg) 100%);
  border-top: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.cta-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 80% at 50% 100%, rgba(0, 196, 167, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.cta-band__inner {
  text-align: center;
  position: relative;
  max-width: 640px;
  margin-inline: auto;
}

.cta-band__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-band__text {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

.cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

/* ── Footer ── */
.footer {
  padding-block: 3.5rem 2rem;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer__brand img {
  height: 28px;
  margin-bottom: 1rem;
}

.footer__brand p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  max-width: 28ch;
  line-height: 1.6;
}

.footer__col h4 {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer__col a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

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

.footer__email a {
  color: var(--color-accent);
  font-weight: 500;
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer__legal {
  display: flex;
  gap: 1.5rem;
}

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

/* ── Modals ── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal[hidden] {
  display: none;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 8, 12, 0.75);
  backdrop-filter: blur(4px);
}

.modal__panel {
  position: relative;
  width: min(100%, 520px);
  max-height: 85vh;
  overflow-y: auto;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-elevated);
  transform: translateY(16px) scale(0.98);
  opacity: 0;
  transition: transform var(--transition-modal), opacity var(--transition-modal);
}

.modal.is-open .modal__panel {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition-base), background var(--transition-base);
}

.modal__close:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.06);
}

.modal__panel h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  padding-right: 2rem;
}

.modal__panel p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  line-height: 1.65;
}

.modal__panel ul {
  margin-bottom: 1.5rem;
}

.modal__panel li {
  display: flex;
  gap: 0.5rem;
  padding: 0.375rem 0;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.modal__panel li::before {
  content: '→';
  color: var(--color-accent);
}

.modal__actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}