/*
 * Design Brief: Nexivantai ← inspired by https://nextai.pro/
 *
 * Structure: centered hero → pillar-row (why choose) → logo-trust-bar →
 *   tabbed-capabilities → solution-audience-cards → feature-split (AI guide) →
 *   cta-statement-band → footer-multi-column
 *
 * Reference logic: warm off-white canvas, oversized confident typography,
 * restrained teal accent, audience-segmented solutions, trust/media strip,
 * closing urgency CTA — NOT dark gradient orbs or glassmorphism grids.
 */

@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;0,9..40,700;1,9..40,400&family=Instrument+Serif:ital@0;1&display=swap');

:root {
  /* Tokens derived from nextai.pro — warm minimal B2B digital transformation */
  --color-bg: #FAFAF8;
  --color-bg-alt: #F2EFE9;
  --color-bg-dark: #1A1D23;
  --color-surface: #FFFFFF;
  --color-text: #1A1D23;
  --color-text-muted: #5C6370;
  --color-text-on-dark: #F5F3EF;
  --color-text-muted-on-dark: #A8ADB8;
  --color-accent: #0B7B6E;
  --color-accent-hover: #096159;
  --color-accent-light: #E6F5F3;
  --color-accent-warm: #D4622A;
  --color-accent-warm-hover: #B8521F;
  --color-border: #E2DED6;
  --color-border-dark: #2E333D;

  --font-display: 'DM Sans', system-ui, sans-serif;
  --font-serif: 'Instrument Serif', Georgia, serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  --space-section: clamp(4rem, 8vw, 7rem);
  --space-grid: clamp(1.5rem, 3vw, 2.5rem);
  --container-max: 1200px;
  --container-narrow: 900px;

  --shadow-sm: 0 1px 3px rgba(26, 29, 35, 0.06);
  --shadow-md: 0 8px 32px rgba(26, 29, 35, 0.08);
  --shadow-lg: 0 20px 60px rgba(26, 29, 35, 0.12);

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

  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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(var(--container-max), calc(100% - 2rem));
  margin-inline: auto;
}

.container--narrow {
  width: min(var(--container-narrow), calc(100% - 2rem));
  margin-inline: auto;
}

.section-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--color-text-muted);
  max-width: 62ch;
}

.section-header {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

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

.section-header--center .section-desc {
  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-pill);
  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-warm);
  color: #fff;
}

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

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

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

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

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

.btn--ghost {
  color: var(--color-accent);
  padding-inline: 0;
  font-weight: 600;
}

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

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

.header.is-scrolled {
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

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

.header__logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

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

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

.header__links {
  display: flex;
  gap: 2rem;
}

.header__links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

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

.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);
  border-radius: 2px;
  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 — centered typography */
.hero {
  padding-top: calc(var(--header-height) + 3rem);
  padding-bottom: var(--space-section);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(11, 123, 110, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 90% 80%, rgba(212, 98, 42, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  max-width: 820px;
  margin-inline: auto;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 1rem;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  margin-bottom: 1.75rem;
}

.hero__title {
  font-size: clamp(2.5rem, 6.5vw, 4.25rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero__title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--color-accent);
}

.hero__subtitle {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 58ch;
  margin-inline: auto;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 3.5rem;
}

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

.hero__diagram {
  width: 100%;
  aspect-ratio: 16 / 7;
}

/* Platform Overview — pillar-row */
.platform {
  padding-block: var(--space-section);
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

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

.pillar {
  padding: 2rem;
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.pillar__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  color: var(--color-accent);
}

.pillar__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.625rem;
}

.pillar__text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* Trust bar — logo-trust-bar */
.trust {
  padding-block: clamp(2.5rem, 5vw, 4rem);
  background: var(--color-bg-alt);
}

.trust__header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.trust__title {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.trust__desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-inline: auto;
}

.trust__logos {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2.5rem 3.5rem;
}

.trust__logo {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  opacity: 0.65;
  transition: opacity var(--transition-base);
}

.trust__logo:hover {
  opacity: 1;
}

/* Capabilities — tabbed-platform */
.capabilities {
  padding-block: var(--space-section);
}

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

.cap-tab {
  padding: 0.875rem 1.5rem;
  font-size: 0.9375rem;
  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);
}

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

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

.cap-panel {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-grid);
  align-items: center;
}

.cap-panel.is-active {
  display: grid;
}

.cap-panel__content h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.cap-panel__content p {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.cap-panel__list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding-block: 0.625rem;
  font-size: 0.9375rem;
}

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

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

.cap-panel__visual svg {
  width: 100%;
  max-height: 240px;
}

/* Solutions — solution-audience-cards */
.solutions {
  padding-block: var(--space-section);
  background: var(--color-bg-alt);
}

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

.solution-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.solution-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.solution-card__tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent-warm);
  margin-bottom: 1rem;
}

.solution-card__title {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 0.875rem;
}

.solution-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  flex: 1;
  margin-bottom: 1.75rem;
  line-height: 1.65;
}

/* Technology — feature-split */
.technology {
  padding-block: var(--space-section);
}

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

.tech-split__visual {
  background: linear-gradient(145deg, var(--color-bg-dark) 0%, #2A3140 100%);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.tech-split__visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 70%, rgba(11, 123, 110, 0.25) 0%, transparent 50%);
}

.tech-split__visual svg {
  position: relative;
  width: 100%;
  max-width: 320px;
}

.tech-split__content .section-label {
  margin-bottom: 0.75rem;
}

.tech-split__content h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.tech-split__content p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.tech-split__features {
  margin-top: 1.5rem;
  margin-bottom: 2rem;
}

.tech-split__features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-block: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
}

.tech-split__features li svg {
  flex-shrink: 0;
  color: var(--color-accent);
}

/* CTA — cta-statement-band */
.cta-band {
  padding-block: var(--space-section);
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 80% at 50% 120%, rgba(11, 123, 110, 0.2) 0%, transparent 60%);
  pointer-events: none;
}

.cta-band__inner {
  position: relative;
  max-width: 680px;
  margin-inline: auto;
}

.cta-band__title {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.cta-band__desc {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--color-text-muted-on-dark);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

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

/* Footer */
.footer {
  padding-block: clamp(3rem, 6vw, 5rem) 2rem;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer__brand p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-top: 1rem;
  max-width: 32ch;
  line-height: 1.65;
}

.footer__col h4 {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.footer__col ul li {
  margin-bottom: 0.625rem;
}

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

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

.footer__email {
  font-weight: 600;
  color: var(--color-text) !important;
}

.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: 0.875rem;
  color: var(--color-text-muted);
}

/* Modals */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal[hidden] {
  display: none;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(26, 29, 35, 0.6);
  backdrop-filter: blur(4px);
}

.modal__panel {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  max-width: 520px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.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: background var(--transition-base), color var(--transition-base);
}

.modal__close:hover {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

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

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

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

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

.modal__panel ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-accent);
}

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