/*
 * Design Brief: Sentoryx ← inspired by https://www.thenextai.ai/
 *
 * Structure: mission-hero → statement-split → pillar-trio → immersive-band →
 *            model-cards → principles-grid → journey-cta → footer
 *
 * Reference logic: typography-led dark hero, eyebrow labels, alternating dark/light
 * bands, three named pillars, exploration hub band, horizontal product cards,
 * four-column principles, restrained enterprise motion — NOT generic gradient orbs.
 *
 * Tokens derived from NEXTAI visual rhythm: deep charcoal base, warm light sections,
 * cool blue accent, generous vertical spacing, minimal decorative noise.
 */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600&display=swap');

:root {
  --color-bg: #0b0b0c;
  --color-bg-alt: #131315;
  --color-bg-light: #eeede8;
  --color-bg-light-alt: #e4e3dd;
  --color-surface: #1a1a1d;
  --color-surface-elevated: #222226;
  --color-text: #f2f1ed;
  --color-text-muted: #8f8f8a;
  --color-text-dark: #161614;
  --color-text-dark-muted: #5c5c58;
  --color-accent: #2d7ef7;
  --color-accent-hover: #5094ff;
  --color-accent-soft: rgba(45, 126, 247, 0.12);
  --color-border: rgba(242, 241, 237, 0.1);
  --color-border-dark: rgba(22, 22, 20, 0.12);

  --font-display: 'Outfit', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  --space-section: clamp(5rem, 10vw, 8rem);
  --space-block: clamp(2rem, 4vw, 3.5rem);
  --space-grid: clamp(1.5rem, 3vw, 2.5rem);
  --container-max: 1200px;
  --container-wide: 1400px;

  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-reveal: 0.7s cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-soft: 0 24px 64px rgba(0, 0, 0, 0.35);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.2);
}

*, *::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;
}

.section-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

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

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

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

.section-desc {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--color-text-muted);
  max-width: 52ch;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background var(--transition-base), color var(--transition-base),
    border-color var(--transition-base), transform var(--transition-base);
}

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

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

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

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

.btn--secondary:hover {
  border-color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.04);
}

.btn--secondary-dark {
  color: var(--color-text-dark);
  border-color: var(--color-border-dark);
}

.btn--secondary-dark:hover {
  background: rgba(22, 22, 20, 0.05);
}

.btn--ghost {
  padding: 0.5rem 0;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  border-radius: 0;
}

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

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 0;
  transition: background var(--transition-base), backdrop-filter var(--transition-base),
    border-color var(--transition-base);
}

.site-header.is-scrolled {
  background: rgba(11, 11, 12, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

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

.site-header__logo img {
  height: 28px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}

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

.site-nav__links a {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

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

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

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

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

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

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

/* Hero — centered mission typography */
.hero--centered {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  background: var(--color-bg);
  overflow: hidden;
}

.hero--centered::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, transparent 60%, var(--color-bg) 100%),
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(45, 126, 247, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(242, 241, 237, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 241, 237, 0.03) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 80%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  text-align: center;
  max-width: 900px;
  margin-inline: auto;
  padding-block: var(--space-section);
}

.hero__eyebrow {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 2rem;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 1.75rem;
}

.hero__subtitle {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: 2.75rem;
  line-height: 1.7;
}

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

.hero__scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(0.6); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); }
}

/* Platform Overview — statement-split */
.section--light {
  background: var(--color-bg-light);
  color: var(--color-text-dark);
}

.statement-split {
  padding-block: var(--space-section);
}

.statement-split__inner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-grid);
  align-items: start;
}

.statement-split__aside {
  position: sticky;
  top: 7rem;
}

.statement-split__body {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  line-height: 1.75;
  color: var(--color-text-dark-muted);
}

.statement-split__body p + p {
  margin-top: 1.5rem;
}

.statement-split__stat-row {
  display: flex;
  gap: 3rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border-dark);
}

.stat-item__number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-text-dark);
  line-height: 1;
}

.stat-item__label {
  font-size: 0.8125rem;
  color: var(--color-text-dark-muted);
  margin-top: 0.5rem;
}

/* Capabilities — pillar-trio */
.pillar-trio {
  padding-block: var(--space-section);
  background: var(--color-bg-alt);
}

.pillar-trio__header {
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  margin-bottom: var(--space-block);
}

.pillar-trio__header .section-desc {
  margin-inline: auto;
}

.pillar-trio__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.pillar-card {
  background: var(--color-surface);
  padding: clamp(2rem, 4vw, 3rem);
  transition: background var(--transition-base);
}

.pillar-card:hover {
  background: var(--color-surface-elevated);
}

.pillar-card__symbol {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

.pillar-card__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.pillar-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.pillar-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1.75rem;
  font-family: var(--font-display);
  font-size: 0.875rem;
  color: var(--color-accent);
  transition: gap var(--transition-base);
}

.pillar-card__link:hover {
  gap: 0.6rem;
}

/* Solutions — immersive-band */
.immersive-band {
  position: relative;
  padding-block: var(--space-section);
  background: var(--color-bg);
  overflow: hidden;
}

.immersive-band__visual {
  position: absolute;
  inset: 0;
  opacity: 0.4;
}

.immersive-band__visual svg {
  width: 100%;
  height: 100%;
}

.immersive-band__content {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-grid);
  align-items: center;
}

.immersive-band__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 2rem 0;
}

.tag-pill {
  padding: 0.5rem 1rem;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  transition: border-color var(--transition-base), color var(--transition-base);
}

.tag-pill:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

.use-case-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.use-case-item {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.use-case-item:hover {
  border-color: rgba(45, 126, 247, 0.35);
  transform: translateX(4px);
}

.use-case-item__index {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  flex-shrink: 0;
  padding-top: 0.15rem;
}

.use-case-item__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.use-case-item__text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Technology — model-cards-horizontal */
.model-cards {
  padding-block: var(--space-section);
  background: var(--color-bg-light);
}

.model-cards__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
  margin-bottom: var(--space-block);
  flex-wrap: wrap;
}

.model-cards__track {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-grid);
}

.model-card {
  background: #fff;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-lg);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  display: flex;
  flex-direction: column;
  min-height: 320px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.model-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-soft);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  color: var(--color-accent);
}

.model-card__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: 0.75rem;
}

.model-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-dark-muted);
  flex: 1;
  line-height: 1.65;
}

.model-card__action {
  margin-top: 1.75rem;
}

/* Principles grid */
.principles {
  padding-block: var(--space-section);
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.principles__intro {
  text-align: center;
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: var(--space-block);
}

.principles__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-grid);
}

.principle-item {
  padding: 1.75rem;
  border-left: 2px solid var(--color-border);
  transition: border-color var(--transition-base);
}

.principle-item:hover {
  border-left-color: var(--color-accent);
}

.principle-item__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.principle-item__text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* Testimonials strip */
.testimonials {
  padding-block: var(--space-section);
  background: var(--color-bg);
}

.testimonials__header {
  text-align: center;
  margin-bottom: var(--space-block);
}

.testimonials__track {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-grid);
}

.quote-card {
  padding: 2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.quote-card__text {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
  margin-bottom: 1.5rem;
  font-style: italic;
}

.quote-card__author {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* CTA — journey band */
.journey-cta {
  padding-block: var(--space-section);
  background: var(--color-bg-light);
  text-align: center;
}

.journey-cta__inner {
  max-width: 680px;
  margin-inline: auto;
}

.journey-cta__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  color: var(--color-text-dark);
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.journey-cta__text {
  font-size: 1.0625rem;
  color: var(--color-text-dark-muted);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.journey-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

/* Footer */
.site-footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding-block: 4rem 2rem;
}

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

.site-footer__brand img {
  height: 24px;
  margin-bottom: 1rem;
}

.site-footer__brand p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  max-width: 28ch;
  line-height: 1.65;
}

.site-footer__col h4 {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.site-footer__col ul {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

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

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

.site-footer__bottom a {
  transition: color var(--transition-base);
}

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

/* 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(0, 0, 0, 0.72);
  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-soft);
}

.modal__close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  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: 600;
  margin-bottom: 1rem;
  padding-right: 2rem;
}

.modal__panel p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.modal__panel ul {
  margin: 1rem 0;
  padding-left: 0;
}

.modal__panel li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.modal__panel li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.modal__actions {
  margin-top: 1.75rem;
}

/* Policy pages */
.policy-page {
  padding-top: 6rem;
  padding-bottom: var(--space-section);
  background: var(--color-bg-light);
  color: var(--color-text-dark);
  min-height: 100vh;
}

.policy-page__content {
  max-width: 720px;
}

.policy-page h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.policy-page__updated {
  font-size: 0.875rem;
  color: var(--color-text-dark-muted);
  margin-bottom: 2.5rem;
}

.policy-page h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.policy-page p,
.policy-page li {
  font-size: 0.9375rem;
  color: var(--color-text-dark-muted);
  line-height: 1.75;
  margin-bottom: 1rem;
}

.policy-page ul {
  padding-left: 1.25rem;
  list-style: disc;
}

.policy-page a {
  color: var(--color-accent);
  text-decoration: underline;
}