/* ==========================================================================
   Fourfold - Global Styles
   Reset, layout, nav, footer, shared components
   ========================================================================== */

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--text-body);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

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

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

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

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--section-padding) 0;
}

.section--alt {
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-slate) 100%);
  color: var(--text-on-dark);
}

.section--alt .section__title {
  color: var(--white);
}

.section--dark {
  background-color: var(--bg-dark);
  color: var(--white);
}

.section__title {
  font-size: var(--text-h2);
  font-weight: 600;
  line-height: var(--leading-tight);
  margin-bottom: 3rem;
  text-align: center;
}

.section__title--left {
  text-align: left;
  margin-bottom: 2rem;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: 4px;
  font-weight: 500;
  font-size: var(--text-small);
  letter-spacing: 0.01em;
  transition: all var(--duration-fast) var(--ease-out);
}

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

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(13, 148, 136, 0.35);
}

.btn--light {
  background: var(--white);
  color: var(--bg-dark);
}

.btn--light:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
}

.btn--large {
  padding: 1rem 2.5rem;
  font-size: 1rem;
}

/* --------------------------------------------------------------------------
   Floating Island Navbar
   -------------------------------------------------------------------------- */
.ff-nav {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.ff-nav__pill {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0.625rem 1.5rem;
  border-radius: 9999px;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Transparent state (over hero) */
.ff-nav--transparent .ff-nav__pill {
  background: rgba(12, 18, 34, 0.2);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--white);
}

/* Solid state (scrolled past hero) */
.ff-nav--solid .ff-nav__pill {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  color: var(--text-primary);
}

.ff-nav__logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
  color: inherit;
}

.ff-nav__links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.ff-nav__link {
  position: relative;
  font-size: 0.875rem;
  font-weight: 500;
  color: inherit;
  opacity: 0.85;
  transition: opacity var(--duration-fast) ease;
  white-space: nowrap;
}

.ff-nav__link:hover {
  opacity: 1;
}

.ff-nav__link--active {
  opacity: 1;
}

/* Active indicator line */
.ff-nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 15%;
  right: 15%;
  height: 1.5px;
  border-radius: 1px;
  background: var(--accent);
  transition: background var(--duration-fast) ease;
}

.ff-nav--transparent .ff-nav__link--active::after {
  background: rgba(255, 255, 255, 0.7);
}

.ff-nav__cta {
  background: var(--accent);
  color: var(--white);
  padding: 0.5rem 1.25rem;
  border-radius: 9999px;
  opacity: 1;
  transition: all var(--duration-fast) var(--ease-out);
}

.ff-nav__cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(20, 184, 166, 0.35);
}

/* --------------------------------------------------------------------------
   Research Dropdown
   -------------------------------------------------------------------------- */
.ff-nav__dropdown {
  position: relative;
}

.ff-nav__dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  position: relative;
  font-size: 0.875rem;
  font-weight: 500;
  color: inherit;
  opacity: 0.85;
  transition: opacity var(--duration-fast) ease;
  white-space: nowrap;
  cursor: pointer;
  padding: 0;
  background: none;
  border: none;
  font-family: inherit;
}

.ff-nav__dropdown-trigger:hover {
  opacity: 1;
}

.ff-nav__dropdown-arrow {
  width: 10px;
  height: 6px;
  transition: transform 0.25s ease;
}

.ff-nav__dropdown.open .ff-nav__dropdown-arrow {
  transform: rotate(180deg);
}

.ff-nav__dropdown-menu {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  min-width: 220px;
  border-radius: 12px;
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
  pointer-events: none;
}

.ff-nav__dropdown.open .ff-nav__dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.ff-nav--transparent .ff-nav__dropdown-menu {
  background: rgba(12, 18, 34, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.ff-nav--solid .ff-nav__dropdown-menu {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.ff-nav__dropdown-item {
  display: block;
  padding: 0.625rem 1rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: inherit;
  border-radius: 8px;
  transition: background 0.2s ease;
  white-space: nowrap;
}

.ff-nav--transparent .ff-nav__dropdown-item:hover {
  background: rgba(255, 255, 255, 0.1);
}

.ff-nav--solid .ff-nav__dropdown-item:hover {
  background: var(--bg-light);
}

/* Mobile dropdown */
.ff-nav__mobile-dropdown {
  display: flex;
  flex-direction: column;
}

.ff-nav__mobile-dropdown-trigger {
  background: none;
  border: none;
  font-family: inherit;
  cursor: pointer;
  text-align: left;
}

.ff-nav__mobile-dropdown-items {
  display: none;
  padding-left: 1rem;
}

.ff-nav__mobile-dropdown.open .ff-nav__mobile-dropdown-items {
  display: flex;
  flex-direction: column;
}

.ff-nav__mobile-sub {
  font-size: 0.8125rem;
  opacity: 0.7;
  padding: 0.375rem 0;
}

/* Force white text on CTA regardless of nav state */
.ff-nav--solid .ff-nav__cta {
  color: var(--white);
}

/* Hamburger - hidden on desktop */
.ff-nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  padding: 0;
  cursor: pointer;
}

.ff-nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: all 0.3s ease;
}

/* Hamburger open state */
.ff-nav__hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.ff-nav__hamburger.open span:nth-child(2) {
  opacity: 0;
}

.ff-nav__hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile nav */
.ff-nav__mobile-panel {
  display: none;
  position: absolute;
  top: calc(100% + 0.75rem);
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  border-radius: 16px;
  padding: 1rem 1.5rem;
  flex-direction: column;
  gap: 0.5rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.ff-nav__mobile-panel.open {
  display: flex;
  opacity: 1;
}

.ff-nav--transparent .ff-nav__mobile-panel {
  background: rgba(12, 18, 34, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--white);
}

.ff-nav--solid .ff-nav__mobile-panel {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
  color: var(--text-primary);
}

.ff-nav__mobile-panel .ff-nav__link {
  display: block;
  padding: 0.5rem 0;
  font-size: 1rem;
}

.ff-nav__mobile-panel .ff-nav__cta {
  display: inline-block;
  text-align: center;
  margin-top: 0.5rem;
}

@media (max-width: 768px) {
  .ff-nav__links {
    display: none;
  }

  .ff-nav__dropdown-menu {
    display: none;
  }

  .ff-nav__hamburger {
    display: flex;
  }

  .ff-nav__pill {
    gap: 1rem;
    padding: 0.625rem 1.25rem;
  }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.ff-footer {
  padding: 2rem 0;
  background: var(--bg-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.ff-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.ff-footer__logo {
  font-weight: 700;
  color: var(--white);
  font-size: 1.125rem;
}

.ff-footer__copy {
  font-size: var(--text-small);
  color: rgba(255, 255, 255, 0.5);
}

/* --------------------------------------------------------------------------
   Animations & Reveals
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
}

/* --------------------------------------------------------------------------
   Text Link Animation
   -------------------------------------------------------------------------- */
.text-link {
  position: relative;
}

.text-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s var(--ease-out);
}

.text-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* --------------------------------------------------------------------------
   Reduced Motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .marquee-track {
    animation: none;
  }

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