/* =========================================================
   COMPONENTS — Nav, Footer, Buttons
   ========================================================= */

/* ── Navigation ──────────────────────────────────────────── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--dur-base) var(--ease-out);
}

.nav.is-scrolled {
  /* background handled by nav__blur::before so it fades with the blur */
}

/* Progressive blur — 4 stacked layers, heavy at top, zero at bottom edge */
.nav__blur {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
}

/* Background layer — fades top-to-bottom so no hard box edge */
.nav__blur::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 10, 0.85);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
  transition: background 0.3s ease;
}

.nav.is-scrolled .nav__blur {
  opacity: 1;
}

/* Light mode — dark text, transparent blur for light bg sections */
.nav--light .nav__blur::before {
  background: transparent;
}

.nav--light .nav__logo,
.nav--light .nav__link {
  color: var(--color-text-dark);
  transition: color 0.3s ease;
}

.nav__blur > div {
  position: absolute;
  inset: 0;
}

/* Layer 1 — heaviest blur, top quarter only */
.nav__blur > div:nth-child(1) {
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 25%);
  mask-image: linear-gradient(to bottom, black 0%, transparent 25%);
}

/* Layer 2 — strong blur, top half */
.nav__blur > div:nth-child(2) {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 50%);
  mask-image: linear-gradient(to bottom, black 0%, transparent 50%);
}

/* Layer 3 — medium blur, top three-quarters */
.nav__blur > div:nth-child(3) {
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 75%);
  mask-image: linear-gradient(to bottom, black 0%, transparent 75%);
}

/* Layer 4 — lightest blur, fades to zero at very bottom */
.nav__blur > div:nth-child(4) {
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* Logo */
.nav__logo {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-text);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0;
  overflow: hidden;
}

.nav__logo-k,
.nav__logo-f {
  display: inline-block;
}

.nav__logo-aren,
.nav__logo-erreira,
.nav__logo-sep {
  display: inline-block;
  max-width: 0;
  overflow: hidden;
  white-space: nowrap;
  opacity: 0;
  transition: max-width var(--dur-slow) var(--ease-out),
              opacity var(--dur-slow) var(--ease-out);
}

.nav__logo-dot {
  display: inline-block;
  overflow: hidden;
  white-space: nowrap;
  max-width: 1em;
  opacity: 1;
  transition: max-width var(--dur-slow) var(--ease-out),
              opacity var(--dur-slow) var(--ease-out);
}

.nav__logo:hover .nav__logo-aren {
  max-width: 3em;
  opacity: 1;
}

.nav__logo:hover .nav__logo-sep {
  max-width: 0.6em;
  opacity: 1;
}

.nav__logo:hover .nav__logo-erreira {
  max-width: 5em;
  opacity: 1;
}

.nav__logo:hover .nav__logo-dot {
  max-width: 0;
  opacity: 0;
}

/* Nav links */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-2);
  position: relative;
  display: inline-block;
  overflow: hidden;
}

.nav__link span {
  display: block;
  transition: transform 0.35s var(--ease-out);
}

.nav__link::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  color: var(--color-accent);
  transform: translateY(100%);
  transition: transform 0.35s var(--ease-out);
}

.nav__link:hover span {
  transform: translateY(-100%);
}

.nav__link:hover::after {
  transform: translateY(0);
}

.nav__link.is-active {
  color: var(--color-text);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  padding: 4px 0;
}

.nav__hamburger-line {
  display: block;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--dur-base) var(--ease-out),
              opacity var(--dur-fast) var(--ease-out);
  transform-origin: center;
}

.nav__hamburger.is-open .nav__hamburger-line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__hamburger.is-open .nav__hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__hamburger.is-open .nav__hamburger-line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile overlay */
.nav__overlay {
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  z-index: 99;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out);
}

.nav__overlay.is-open {
  opacity: 1;
  pointer-events: all;
}

.nav__overlay-link {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
  position: relative;
  display: inline-block;
  overflow: hidden;
}

.nav__overlay-link span {
  display: block;
  transition: transform 0.35s var(--ease-out);
}

.nav__overlay-link::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  color: var(--color-accent);
  transform: translateY(100%);
  transition: transform 0.35s var(--ease-out);
}

.nav__overlay-link:hover span {
  transform: translateY(-100%);
}

.nav__overlay-link:hover::after {
  transform: translateY(0);
}

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

  .nav__hamburger {
    display: flex;
  }
}

/* ── Footer ──────────────────────────────────────────────── */

.footer {
  padding-block: var(--space-xl) var(--space-lg);
}

.footer__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer__item {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding-block: clamp(0.875rem, 2.25vw, 1.5rem);
}

.footer__link {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5.5vw, 6rem);
  font-weight: 800;
  line-height: 1;
  color: var(--color-text);
  letter-spacing: -0.02em;
  text-decoration: none;
  position: relative;
  display: inline-block;
  overflow: hidden;
}

.footer__link > span {
  display: block;
  transition: transform 0.35s var(--ease-out);
}

.footer__link::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  color: var(--color-accent);
  transform: translateY(100%);
  transition: transform 0.35s var(--ease-out);
}

.footer__item:hover .footer__link > span {
  transform: translateY(-100%);
}

.footer__item:hover .footer__link::after {
  transform: translateY(0);
}

/* Footer social links (case study pages) */
.footer__social-link {
  position: relative;
  display: inline-block;
  overflow: hidden;
}

.footer__social-link span {
  display: block;
  transition: transform 0.35s var(--ease-out);
}

.footer__social-link::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  color: var(--color-accent);
  transform: translateY(100%);
  transition: transform 0.35s var(--ease-out);
}

.footer__social-link:hover span {
  transform: translateY(-100%);
}

.footer__social-link:hover::after {
  transform: translateY(0);
}

.footer__copy-btn {
  opacity: 0;
  filter: blur(6px);
  flex-shrink: 0;
  margin-left: clamp(1rem, 2vw, 2rem);
  min-width: 5rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition:
    color        var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    background   var(--dur-base) var(--ease-out),
    box-shadow   var(--dur-base) var(--ease-out),
    backdrop-filter var(--dur-base) var(--ease-out),
    transform    var(--dur-base) var(--ease-out),
    min-width    0.35s var(--ease-out),
    padding      0.35s var(--ease-out);
  white-space: nowrap;
}

.footer__copy-btn:hover {
  color: #fff;
  border-color: transparent;
  background:
    linear-gradient(
      135deg,
      rgba(255, 255, 255, 0.28) 0%,
      rgba(255, 255, 255, 0.08) 50%,
      rgba(255, 255, 255, 0.18) 100%
    ) padding-box,
    linear-gradient(
      160deg,
      rgba(255, 255, 255, 0.32) 0%,
      rgba(255, 255, 255, 0.1) 35%,
      rgba(255, 255, 255, 0) 65%,
      rgba(255, 255, 255, 0.06) 100%
    ) border-box;
  backdrop-filter: blur(24px) saturate(180%) contrast(115%);
  -webkit-backdrop-filter: blur(24px) saturate(180%) contrast(115%);
  box-shadow:
    inset 0 1px 0.5px rgba(255, 255, 255, 0.55),
    0 20px 48px -10px rgba(0, 0, 0, 0.28),
    0 32px 80px -16px rgba(0, 0, 0, 0.2);
}

.footer__copy-btn.is-copied {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
}

@media (max-width: 768px) {
  .footer__link {
    font-size: clamp(1.25rem, 8.5vw, 2.5rem);
  }
}

/* ── Buttons ─────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  position: relative;
  overflow: hidden;
  transition: border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-text);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-base) var(--ease-out);
  z-index: 0;
}

.btn:hover::before {
  transform: scaleX(1);
}

.btn:hover {
  color: var(--color-bg);
  border-color: var(--color-text);
}

.btn span,
.btn svg {
  position: relative;
  z-index: 1;
}

/* ── Accent name color ───────────────────────────────────── */

.accent {
  color: var(--color-accent);
}

/* ── Card pile (shared — used by cases and passion scenes) ─ */

.case-pile {
  display: flex;
  justify-content: center;
  cursor: grab;
}

.case-pile:active {
  cursor: grabbing;
}

.case-pile__stack {
  position: relative;
  width: fit-content;
  max-height: 60vh;
}

.case-pile__card {
  position: relative;
  border-radius: 32px;
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.3s ease;
}

.case-pile__badge {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: var(--color-danger);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 0.4em 0.85em;
  border-radius: 999px;
  z-index: 4;
  transform: rotate(18deg);
  box-shadow: 0 4px 12px rgba(217, 54, 54, 0.3);
}

/* First card — base, no rotation */
.case-pile__card:nth-child(1) {
  position: relative;
  z-index: 3;
}

/* Cards behind — absolute, peeking out subtly */
.case-pile__card:nth-child(2),
.case-pile__card:nth-child(3) {
  position: absolute;
  inset: 0;
}

.case-pile__card:nth-child(2) {
  z-index: 2;
  transform: rotate(3deg) translate(12px, 6px);
}

.case-pile__card:nth-child(3) {
  z-index: 1;
  transform: rotate(-4deg) translate(-14px, 10px);
}

.case-pile__card img {
  width: 100%;
  height: auto;
  max-height: 60vh;
  display: block;
}

/* Hover — fan out */
.case-pile:hover .case-pile__card:nth-child(2) {
  transform: rotate(5deg) translate(28px, 10px);
}

.case-pile:hover .case-pile__card:nth-child(3) {
  transform: rotate(-6deg) translate(-30px, 16px);
}

@media (max-width: 768px) {
  .case-pile__card img {
    max-height: 45vh;
  }

  .case-pile__card {
    border-radius: var(--radius-panel);
  }
}