/* ==========================================================================
   Avoflow — site.css
   Single stylesheet. Layers: tokens → reset → base → utilities → components
   → breakpoints are inlined per component (mobile-first: 640 / 768 / 1024).
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Tokens
   -------------------------------------------------------------------------- */
:root {
  --color-primary: #4B4BDD;
  --color-primary-dark: #3A3AC4;
  --color-primary-soft: rgba(75, 75, 221, 0.08);
  --color-accent: #2868D8;
  --color-navy: #0A132D;
  --color-text: #121212;
  --color-text-2: #64666C;
  --color-border: #E5E5E5;
  --color-bg: #F5F5F5;
  --color-surface: #FFFFFF;
  --gradient-brand: linear-gradient(136deg, #5473DC 0%, #8BF7FF 100%);

  --font-brand: 'Comfortaa', ui-rounded, system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: clamp(1.0625rem, 1rem + 0.3vw, 1.125rem);
  --text-xl: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 1.2vw, 2rem);
  --text-hero: clamp(2rem, 1.35rem + 2.8vw, 3.25rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --section-pad: clamp(4rem, 8vw, 7rem);

  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow-card: 0 12px 32px rgba(10, 19, 45, 0.10);
  --shadow-header: 0 2px 16px rgba(10, 19, 45, 0.08);
  --container: 1200px;
  --measure: 72ch;
  --header-h: 72px;
  --dur: 0.25s;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   2. Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
  -webkit-text-size-adjust: 100%;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

ul {
  padding: 0;
  list-style: none;
}

/* --------------------------------------------------------------------------
   3. Base
   -------------------------------------------------------------------------- */
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-surface);
}

h1,
h2,
h3 {
  font-family: var(--font-brand);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

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

a:hover {
  text-decoration: underline;
}

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

/* --------------------------------------------------------------------------
   4. Utilities
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 100;
  padding: 0.75rem 1.25rem;
  background: var(--color-navy);
  color: #fff;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.skip-link:focus {
  top: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.gradient-text {
  background: linear-gradient(136deg, var(--color-primary) 0%, var(--color-accent) 60%, #8BF7FF 130%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--color-primary); /* fallback if clip unsupported */
}

.section-heading {
  font-size: var(--text-2xl);
  text-align: center;
  margin-bottom: var(--space-2);
}

.section-kicker {
  display: block;
  text-align: center;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

/* --------------------------------------------------------------------------
   5. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--text-base);
  line-height: 1.2;
  text-decoration: none;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 8px 20px rgba(75, 75, 221, 0.35);
}

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

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

.btn-light {
  background: #fff;
  color: var(--color-navy);
}

.btn-light:hover {
  box-shadow: 0 8px 20px rgba(10, 19, 45, 0.25);
}

/* --------------------------------------------------------------------------
   6. Header / navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: box-shadow var(--dur) var(--ease);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-header);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand img {
  height: 40px;
  width: auto;
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--radius-sm);
}

.nav-toggle .bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-navy);
  border-radius: 1px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

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

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

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

.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #fff;
  border-top: 1px solid var(--color-border);
  box-shadow: var(--shadow-header);
  display: none;
}

.site-nav.is-open {
  display: block;
}

.site-nav ul {
  display: flex;
  flex-direction: column;
  padding: var(--space-4) clamp(1.25rem, 4vw, 2.5rem) var(--space-6);
  gap: var(--space-2);
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  padding: 0.6rem 0.4rem;
  font-weight: 500;
  color: var(--color-text);
}

.site-nav a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
}

.site-nav a.btn-primary {
  color: #fff;
  padding: 0.7rem 1.4rem;
  margin-top: var(--space-2);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    display: block;
    background: none;
    border: 0;
    box-shadow: none;
  }

  .site-nav ul {
    flex-direction: row;
    align-items: center;
    padding: 0;
    gap: clamp(var(--space-2), 2vw, var(--space-6));
  }

  .site-nav a.btn-primary {
    margin-top: 0;
    margin-left: var(--space-2);
  }
}

/* --------------------------------------------------------------------------
   7. Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--section-pad);
  background:
    radial-gradient(60% 80% at 110% 10%, rgba(139, 247, 255, 0.18) 0%, transparent 70%),
    radial-gradient(50% 70% at -10% 90%, rgba(75, 75, 221, 0.08) 0%, transparent 70%),
    var(--color-surface);
}

.hero .container {
  display: grid;
  gap: var(--space-12);
  align-items: center;
}

.hero h1 {
  font-size: var(--text-hero);
  letter-spacing: -0.01em;
  max-width: 22ch;
}

.hero-sub {
  margin-top: var(--space-6);
  font-size: var(--text-lg);
  color: var(--color-text-2);
  max-width: 52ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.hero-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  aspect-ratio: 4 / 3;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* the source graphic's content sits on its right side; crop off the
     empty pattern on the left */
  object-position: 92% center;
}

@media (min-width: 1024px) {
  .hero .container {
    grid-template-columns: 1.05fr 1fr;
  }

  .hero-media {
    aspect-ratio: 10 / 9;
  }
}

/* --------------------------------------------------------------------------
   8. Services
   -------------------------------------------------------------------------- */
.services {
  padding-block: var(--section-pad);
  background: var(--color-bg);
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-8);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

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

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  margin-bottom: var(--space-6);
}

.card-icon img {
  width: 36px;
  height: 36px;
}

.card h3 {
  font-size: var(--text-xl);
}

.card p {
  margin-top: var(--space-3);
  color: var(--color-text-2);
  font-size: var(--text-base);
}

@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --------------------------------------------------------------------------
   9. FAQ accordion
   -------------------------------------------------------------------------- */
.faq {
  padding-block: var(--section-pad);
}

.accordion {
  max-width: var(--measure);
  margin: var(--space-12) auto 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.accordion-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.accordion-item.is-open {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-header);
}

.accordion-item h3 {
  font-family: var(--font-body);
  font-size: var(--text-base);
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  width: 100%;
  padding: var(--space-4) var(--space-6);
  text-align: left;
  font-weight: 600;
  line-height: 1.45;
}

.accordion-trigger svg {
  flex-shrink: 0;
  color: var(--color-primary);
  transition: transform var(--dur) var(--ease);
}

.accordion-item.is-open .accordion-trigger svg {
  transform: rotate(45deg);
}

.accordion-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur) var(--ease);
}

.accordion-item.is-open .accordion-panel {
  grid-template-rows: 1fr;
}

.accordion-panel > div {
  overflow: hidden;
}

.accordion-panel p {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--color-text-2);
}

/* --------------------------------------------------------------------------
   10. Contact CTA
   -------------------------------------------------------------------------- */
.cta {
  padding-block: 0 var(--section-pad);
}

.cta-panel {
  background: var(--gradient-brand);
  border-radius: var(--radius-lg);
  padding: clamp(2.5rem, 6vw, 4.5rem) clamp(1.5rem, 5vw, 4rem);
  text-align: center;
}

.cta-panel h2 {
  font-size: var(--text-2xl);
  color: #fff;
}

.cta-panel p {
  margin-top: var(--space-4);
  color: var(--color-navy);
  font-weight: 500;
}

.cta-panel .btn {
  margin-top: var(--space-8);
}

/* --------------------------------------------------------------------------
   11. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-navy);
  color: var(--color-border);
  padding-top: var(--space-16);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  padding-bottom: var(--space-12);
}

.site-footer .brand img {
  height: 36px;
  filter: brightness(0) invert(1);
}

.footer-tagline {
  margin-top: var(--space-4);
  color: #9AA3B5;
  font-size: var(--text-sm);
  max-width: 36ch;
}

.site-footer h2 {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #9AA3B5;
  margin-bottom: var(--space-4);
}

.site-footer nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.site-footer a {
  color: var(--color-border);
}

.site-footer a:hover {
  color: #fff;
}

.footer-contact a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-block: var(--space-6);
  font-size: var(--text-sm);
  color: #9AA3B5;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

/* --------------------------------------------------------------------------
   12. About page — overview + tabs
   -------------------------------------------------------------------------- */
.overview {
  padding-block: var(--section-pad);
}

.overview .container {
  display: grid;
  gap: var(--space-12);
  align-items: center;
}

.overview figure img {
  border-radius: var(--radius-lg);
  width: 100%;
}

.overview h1 {
  font-size: var(--text-2xl);
}

.tabs {
  display: flex;
  gap: var(--space-6);
  margin-top: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.tab {
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text-2);
  padding: 0 0 var(--space-3);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.tab[aria-selected="true"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-panel > p {
  margin-top: var(--space-6);
  color: var(--color-text-2);
}

.checklist {
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.checklist li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-weight: 500;
}

.checklist svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-accent);
}

@media (min-width: 1024px) {
  .overview .container {
    grid-template-columns: 1fr 1fr;
  }
}

/* --------------------------------------------------------------------------
   13. Team
   -------------------------------------------------------------------------- */
.team {
  padding-block: var(--section-pad);
  background: var(--color-bg);
}

.team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8) var(--space-6);
  margin-top: var(--space-12);
}

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

.team-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.team-card h3 {
  font-size: var(--text-lg);
  margin-top: var(--space-4);
}

.team-card .role {
  color: var(--color-text-2);
  font-size: var(--text-sm);
  margin-top: var(--space-1);
}

.team-card .linkedin {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-top: var(--space-3);
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-navy);
  background: var(--color-surface);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.team-card .linkedin:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

@media (min-width: 640px) {
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --------------------------------------------------------------------------
   14. Back to top
   -------------------------------------------------------------------------- */
.to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 40;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-card);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease),
    transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  background: var(--color-primary-dark);
}

/* --------------------------------------------------------------------------
   15. Reveal animations
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------------------------
   16. Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}