:root {
  --deep: #06343d;
  --lake: #0a6b78;
  --teal: #148f9c;
  --mist: #e7f4f3;
  --foam: #f3faf9;
  --sun: #e6b23c;
  --sun-deep: #c7921f;
  --ink: #0d2a30;
  --muted: rgba(13, 42, 48, 0.72);
  --line: rgba(10, 107, 120, 0.16);
  --shadow: 0 22px 60px rgba(6, 52, 61, 0.16);
  --font-display: "Syne", "Avenir Next", sans-serif;
  --font-body: "Figtree", "Segoe UI", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.06rem;
  line-height: 1.65;
  /* Soft white carbon / Kevlar twill — quiet, fine weave */
  --carbon-base: #f7f7f5;
  background-color: var(--carbon-base);
  background-image:
    radial-gradient(ellipse 75% 45% at 0% 0%, rgba(20, 143, 156, 0.035), transparent 55%),
    radial-gradient(ellipse 55% 35% at 100% 5%, rgba(230, 178, 60, 0.025), transparent 50%),
    /* twill A */
    repeating-linear-gradient(
      45deg,
      rgba(70, 74, 78, 0.028) 0 1.5px,
      transparent 1.5px 6px,
      rgba(255, 255, 255, 0.35) 6px 7px,
      transparent 7px 12px
    ),
    /* twill B (offset) */
    repeating-linear-gradient(
      -45deg,
      rgba(55, 58, 62, 0.022) 0 1.5px,
      transparent 1.5px 6px,
      rgba(255, 255, 255, 0.28) 6px 7px,
      transparent 7px 12px
    ),
    linear-gradient(180deg, #fbfbfa 0%, var(--carbon-base) 45%, #f1f1ee 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 0.9rem;
  background: var(--deep);
  color: var(--foam);
  border-radius: 0.4rem;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1.25rem, 4vw, 3rem);
  color: var(--foam);
  background: linear-gradient(180deg, rgba(6, 52, 61, 0.55), transparent);
  transition: background 0.35s var(--ease), backdrop-filter 0.35s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(6, 52, 61, 0.9);
  backdrop-filter: blur(10px);
}

.logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.nav {
  display: none;
  gap: 1.4rem;
}

.nav a {
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 600;
  opacity: 0.92;
}

.nav a:hover,
.nav a:focus-visible {
  opacity: 1;
  text-decoration: underline;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.15rem;
  padding: 0.18rem;
  border: 1px solid rgba(243, 250, 249, 0.35);
  border-radius: 999px;
  background: rgba(6, 52, 61, 0.28);
}

.lang-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: rgba(243, 250, 249, 0.82);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  min-width: 2rem;
  min-height: 1.7rem;
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.lang-btn:hover,
.lang-btn:focus-visible {
  color: var(--foam);
  outline: none;
}

.lang-btn.is-active {
  background: rgba(243, 250, 249, 0.92);
  color: var(--deep);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.95rem;
  border: 1px solid rgba(243, 250, 249, 0.5);
  border-radius: 999px;
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.header-cta:hover,
.header-cta:focus-visible {
  background: var(--foam);
  color: var(--deep);
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  color: var(--foam);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: #06343d;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.05);
}

.hero-video {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-video iframe,
#hero-yt-player,
#hero-yt-player iframe {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100vw;
  height: 56.25vw;
  min-height: 100%;
  min-width: 177.78vh;
  border: 0;
  transform: translate(-50%, -50%) scale(1.12);
  pointer-events: none;
}

.hero-veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(6, 52, 61, 0.42) 0%, rgba(6, 52, 61, 0.28) 40%, rgba(6, 52, 61, 0.82) 100%),
    radial-gradient(ellipse at 70% 30%, rgba(230, 178, 60, 0.16), transparent 40%);
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: min(44rem, calc(100% - 2.5rem));
  margin: 0 auto 0 clamp(1.25rem, 5vw, 4.5rem);
  padding: 0 0 clamp(3.5rem, 10vh, 6.5rem);
}

.brand {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 10vw, 6.2rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: 0.08em;
}

.brand-sub {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: rgba(243, 250, 249, 0.92);
}

.hero h1 {
  margin: 0 0 1rem;
  max-width: 18ch;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.2;
}

.lede {
  margin: 0 0 1.6rem;
  max-width: 34ch;
  color: rgba(243, 250, 249, 0.9);
}

.cta-row,
.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0.7rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 0.25s var(--ease),
    background 0.25s var(--ease),
    border-color 0.25s var(--ease),
    color 0.25s var(--ease);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--sun);
  color: #1f1604;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--sun-deep);
  color: #fff8e8;
}

.btn-ghost {
  background: transparent;
  color: var(--foam);
  border-color: rgba(243, 250, 249, 0.55);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: rgba(243, 250, 249, 0.12);
}

.btn-outline {
  background: transparent;
  color: var(--lake);
  border-color: rgba(10, 107, 120, 0.35);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background: rgba(10, 107, 120, 0.08);
}

.section {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  width: min(1100px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: clamp(4.5rem, 11vw, 7.5rem) 0;
}

.section-copy {
  max-width: 34rem;
}

.eyebrow {
  margin: 0 0 0.65rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lake);
}

.section h2,
.gallery-intro h2,
.about-panel h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--deep);
}

.section p,
.results-lede,
.results-note,
.about-panel p {
  margin: 0;
  color: var(--muted);
}

.problem-visual,
.boat-visual {
  overflow: hidden;
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
}

.problem-visual img,
.boat-visual img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.8s var(--ease);
}

.problem-visual:hover img,
.boat-visual:hover img {
  transform: scale(1.04);
}

.results {
  padding-top: clamp(2rem, 6vw, 4rem);
}

.results-inner {
  width: min(760px, 100%);
  margin: 0 auto;
}

.results-lede {
  margin-bottom: 2rem;
  font-size: 1.12rem;
}

.metrics {
  display: grid;
  gap: 1.25rem 2rem;
  margin: 0 0 1.75rem;
  padding: 0;
}

.metrics div {
  display: grid;
  gap: 0.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.metrics dt {
  font-size: 0.92rem;
  color: var(--muted);
}

.metrics dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--lake);
  letter-spacing: -0.02em;
}

.gallery {
  padding: clamp(2rem, 6vw, 4rem) 0 clamp(4rem, 10vw, 6rem);
}

.gallery-intro {
  width: min(1100px, calc(100% - 2.5rem));
  margin: 0 auto 1.75rem;
}

.gallery-strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(260px, 78vw);
  gap: 1rem;
  overflow-x: auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem) 1rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.gallery-strip figure {
  margin: 0;
  scroll-snap-align: start;
}

.gallery-strip img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.gallery-strip figcaption {
  margin-top: 0.65rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
}

.section-head {
  width: min(720px, 100%);
  margin-bottom: 0.5rem;
}

.section-head p {
  color: var(--muted);
}

.section-head .about-links {
  margin-top: 1.35rem;
}

.videos {
  display: block;
  padding-top: clamp(3rem, 8vw, 5rem);
}

.brazil {
  display: block;
}

.brazil-poster {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.brazil-poster img {
  width: 100%;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  background: #111;
}

.brazil-caption {
  margin: 0.75rem 0 0;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--muted);
}

.brazil-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.brazil-grid figure {
  margin: 0;
}

.brazil-grid img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.brazil-grid figcaption {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
}

.brazil-video {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.brazil-video p {
  margin: 0.85rem 0 0;
  color: var(--muted);
}

.brazil-video a {
  color: var(--lake);
  font-weight: 600;
}

.is-hidden {
  display: none !important;
}

.trip {
  display: block;
}

.trip-admin {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}

.trip-admin-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem 1.25rem;
}

.trip-count {
  margin: 0;
  font-weight: 700;
  color: var(--deep);
}

.trip-admin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
}

.trip-add-btn {
  cursor: pointer;
}

.trip-login-form {
  margin-top: 1rem;
  display: grid;
  gap: 0.75rem;
  max-width: 28rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.55);
}

.trip-login-form label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--deep);
}

.trip-login-form input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  font: inherit;
  color: var(--ink);
  background: #fff;
}

.trip-login-error {
  margin: 0;
  color: #9b2c2c;
  font-size: 0.9rem;
  font-weight: 600;
}

.trip-admin-note {
  margin: 0.85rem 0 0;
  color: var(--lake);
  font-weight: 600;
}

.trip-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: clamp(1.35rem, 3vw, 2rem);
}

.trip-card {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: 0.9rem;
  background: #0b3a42;
  box-shadow: var(--shadow);
  aspect-ratio: 1 / 1;
}

.trip-card img,
.trip-card video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.trip-open {
  position: absolute;
  inset: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
}

.trip-remove {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  z-index: 2;
  border: 0;
  border-radius: 999px;
  padding: 0.4rem 0.7rem;
  background: rgba(8, 30, 34, 0.82);
  color: #fff;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
}

.trip-remove:hover,
.trip-remove:focus-visible {
  background: #9b2c2c;
}

.trip-video-badge {
  position: absolute;
  left: 0.55rem;
  bottom: 0.55rem;
  z-index: 1;
  padding: 0.28rem 0.55rem;
  border-radius: 999px;
  background: rgba(8, 30, 34, 0.78);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  pointer-events: none;
}

.trip-empty {
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-weight: 600;
}

.trip-load-more {
  display: block;
  margin: 1.35rem auto 0;
  min-width: 12rem;
}

.trip-lightbox {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;
  background: rgba(4, 22, 26, 0.92);
}

.trip-lightbox[hidden],
.trip-lightbox.is-hidden {
  display: none !important;
}

.trip-lightbox-figure {
  margin: 0;
  display: grid;
  place-items: center;
  max-height: calc(100vh - 2rem);
}

.trip-lightbox-figure img,
.trip-lightbox-figure video {
  max-width: min(1100px, 100%);
  max-height: calc(100vh - 2rem);
  width: auto;
  height: auto;
  border-radius: 0.75rem;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

.trip-lightbox-close,
.trip-lightbox-nav {
  border: 0;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 1.75rem;
  line-height: 1;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 999px;
  cursor: pointer;
}

.trip-lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  z-index: 2;
}

.trip-lightbox-nav {
  align-self: center;
}

body.trip-lightbox-open {
  overflow: hidden;
}

@media (min-width: 760px) {
  .trip-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
  }
}

@media (min-width: 1100px) {
  .trip-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.video-list {
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.video-item h3 {
  margin: 1rem 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--deep);
}

.video-item p {
  margin: 0;
  color: var(--muted);
}

.video-item a {
  color: var(--lake);
  font-weight: 600;
}

.video-frame {
  position: relative;
  overflow: hidden;
  border-radius: 1rem;
  background: var(--deep);
  box-shadow: var(--shadow);
  aspect-ratio: 16 / 9;
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.paper {
  display: block;
}

.paper-viewer {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: #fff;
  box-shadow: var(--shadow);
}

.paper-viewer iframe {
  display: block;
  width: 100%;
  height: min(80vh, 900px);
  border: 0;
  background: #f7f7f7;
}

.about {
  padding-top: 0;
}

.about-panel {
  width: min(680px, 100%);
  margin: 0 auto;
}

.about-panel p + p {
  margin-top: 1rem;
}

.about-links {
  margin-top: 1.75rem;
}

.site-footer {
  padding: 2.5rem clamp(1.25rem, 4vw, 3rem) 3rem;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--muted);
}

.footer-brand {
  margin: 0 0 0.2rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--deep);
}

.footer-expand {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--lake);
}

.site-footer p {
  margin: 0.2rem 0;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(1.15rem);
  transition:
    opacity 0.8s var(--ease),
    transform 0.8s var(--ease);
}

[data-reveal][data-delay="1"] {
  transition-delay: 0.12s;
}

[data-reveal][data-delay="2"] {
  transition-delay: 0.22s;
}

[data-reveal][data-delay="3"] {
  transition-delay: 0.32s;
}

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

@keyframes drift {
  from {
    transform: scale(1.05) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.12) translate3d(-1.2%, -1%, 0);
  }
}

@media (min-width: 760px) {
  .nav {
    display: flex;
  }

  .problem,
  .boat {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

  .metrics {
    grid-template-columns: 1fr 1fr;
  }

  .gallery-strip {
    grid-auto-columns: minmax(320px, 36vw);
  }

  .video-list {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 760px) {
  .brazil-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .brazil-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .video-list {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-video {
    display: none;
  }

  .hero-image {
    animation: none;
    transform: none;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn:hover,
  .btn:focus-visible,
  .problem-visual:hover img,
  .boat-visual:hover img {
    transform: none;
  }
}