:root {
  --ink: #173f54;
  --ink-deep: #0b344a;
  --petrol: #315a73;
  --blue-grey: #7ea5be;
  --sky: #dfeff3;
  --paper: #f8f5f0;
  --white: #ffffff;
  --turquoise: #6ec5c2;
  --green: #79b78d;
  --orange: #c75224;
  --amber: #f7a51b;
  --purple: #8e77ad;
  --olive: #9da477;
  --border: #d5e1e5;
  --shadow: 0 18px 50px rgba(11, 52, 74, 0.12);
  --radius: 24px;
  --container: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink-deep);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
}

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

a {
  color: inherit;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.12;
}

h1 {
  max-width: 760px;
  margin-bottom: 1.4rem;
  color: var(--petrol);
  font-size: clamp(2.2rem, 4.8vw, 4.65rem);
  letter-spacing: -0.045em;
}

h2 {
  margin-bottom: 1rem;
  color: var(--ink);
  font-size: clamp(1.8rem, 3.2vw, 3rem);
  letter-spacing: -0.03em;
}

h3 {
  margin-bottom: 0.65rem;
  font-size: 1.18rem;
}

.container {
  width: min(calc(100% - 3rem), var(--container));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  background: var(--ink-deep);
  color: var(--white);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.hero-header {
  position: relative;
  min-height: 700px;
  overflow: hidden;
  background: var(--sky);
}

.hero-header::after {
  position: absolute;
  right: -7rem;
  bottom: -10rem;
  width: 28rem;
  height: 28rem;
  border: 54px solid rgba(110, 197, 194, 0.28);
  border-radius: 50%;
  content: "";
}

.hero-layout {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 700px;
  align-items: center;
  grid-template-columns: minmax(0, 1.18fr) minmax(320px, 0.82fr);
  gap: 4rem;
  padding-block: 2.5rem 4rem;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.eyebrow,
.section-kicker,
.file-type {
  margin-bottom: 0.6rem;
  color: var(--orange);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-lead {
  max-width: 650px;
  margin-bottom: 2rem;
  color: #395a6b;
  font-size: clamp(1.05rem, 1.5vw, 1.28rem);
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.3rem;
  border-radius: 999px;
  font-weight: 750;
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.button-primary {
  background: var(--orange);
  box-shadow: 0 10px 22px rgba(238, 116, 56, 0.25);
  color: var(--white);
}

.hero-visual {
  position: relative;
  min-height: 550px;
}

.hero-visual::before {
  position: absolute;
  z-index: 1;
  right: 2%;
  bottom: 3%;
  width: min(48%, 260px);
  aspect-ratio: 1;
  border: 8px solid rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  background: #b8dde7;
  box-shadow: 0 18px 40px rgba(21, 64, 82, 0.16);
  content: "";
}

.map-shape {
  position: absolute;
  inset: -7% -28% 28% -2%;
  background-color: #547182;
  background-image: url("./assets/images/cartografia-inundaciones.jpg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: auto 108%;
  clip-path: polygon(24% 0, 100% 7%, 81% 100%, 0 76%);
  filter: drop-shadow(0 18px 30px rgba(11, 52, 74, 0.16));
  transform: rotate(4deg) scale(1.025);
  transform-origin: center;
  backface-visibility: hidden;
}

.map-shape-secondary {
  inset: 52% 16% -10% -22%;
  background-position: 45% 64%;
  background-size: auto 112%;
  clip-path: polygon(9% 18%, 87% 0, 100% 76%, 22% 100%);
  transform: rotate(-7deg) scale(1.035);
}

.hero-visual img {
  position: absolute;
  z-index: 2;
  right: 2%;
  bottom: 3%;
  width: min(48%, 260px);
  padding: 0.7rem;
  border-radius: 50%;
  clip-path: circle(50%);
  filter: contrast(1.05) saturate(1.04) drop-shadow(0 8px 10px rgba(21, 64, 82, 0.12));
}

.method-section,
.materials-section {
  padding-block: clamp(3.75rem, 6.4vw, 6rem);
}

.intro-section,
.institutional-section {
  padding-block: clamp(3.25rem, 5.2vw, 4.75rem);
}

.intro-section {
  background: var(--white);
}

.intro-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(2rem, 7vw, 7rem);
}

.intro-copy {
  padding-top: 0.2rem;
}

.intro-main {
  color: var(--ink);
  font-size: clamp(1.15rem, 2vw, 1.42rem);
  font-weight: 650;
  line-height: 1.5;
}

.quality-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.quality-list li {
  padding: 0.55rem 1rem;
  border: 1px solid #a5d4d2;
  border-radius: 999px;
  background: #e5f4f2;
  color: #245f65;
  font-weight: 750;
}

.method-section {
  position: relative;
  overflow: hidden;
  background: var(--paper);
}

.method-section::before {
  position: absolute;
  right: -9rem;
  bottom: 7%;
  width: min(38vw, 540px);
  aspect-ratio: 1.35;
  border: 12px solid rgba(255, 255, 255, 0.72);
  border-radius: 42% 18% 38% 20%;
  background: url("./assets/images/cartografia-inundaciones.jpg") center / cover;
  box-shadow: 0 18px 45px rgba(11, 52, 74, 0.08);
  content: "";
  opacity: 0.09;
  pointer-events: none;
  transform: rotate(-8deg);
}

.method-section > .container {
  position: relative;
  z-index: 1;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 2.5rem;
}

.section-heading > p:last-child {
  color: #4b6876;
  font-size: 1.08rem;
}

.method-grid {
  position: relative;
  display: grid;
  margin: 0 0 2.1rem;
  padding: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  list-style: none;
}

.method-grid::after {
  position: absolute;
  bottom: -2.1rem;
  left: 50%;
  width: 2px;
  height: 2.1rem;
  background: linear-gradient(var(--blue-grey), var(--ink));
  content: "";
  transform: translateX(-50%);
}

.method-card {
  position: relative;
  min-height: 210px;
  overflow: hidden;
  padding: 1.65rem;
  border-top: 7px solid var(--card-color);
  border-radius: 0 0 var(--radius) var(--radius);
  background: var(--white);
  box-shadow: 0 10px 32px rgba(11, 52, 74, 0.07);
  transition: border-color 220ms ease, box-shadow 220ms ease, transform 220ms ease;
}

.method-card::after {
  position: absolute;
  right: -2rem;
  bottom: -3.7rem;
  width: 9rem;
  height: 9rem;
  border: 24px solid color-mix(in srgb, var(--card-color) 20%, transparent);
  border-radius: 50%;
  content: "";
}

.chapter-1 { --card-color: var(--turquoise); }
.chapter-2 { --card-color: var(--olive); }
.chapter-3 { --card-color: var(--purple); }
.chapter-4 { --card-color: var(--green); }
.chapter-5 { --card-color: var(--blue-grey); }
.chapter-6 { --card-color: var(--amber); }

.step-number {
  display: block;
  margin-bottom: 1.2rem;
  color: var(--card-color);
  font-size: 1.8rem;
  font-weight: 850;
}

.method-card p {
  position: relative;
  z-index: 1;
  margin-bottom: 0;
  color: #54717f;
}

.risk-band {
  position: relative;
  display: grid;
  align-items: center;
  gap: 2rem;
  margin-top: 0;
  padding: clamp(2rem, 4vw, 3rem);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--white);
  grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.2fr);
}

.risk-band::before {
  position: absolute;
  top: -10px;
  left: 50%;
  width: 20px;
  height: 20px;
  background: var(--ink);
  content: "";
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  transform: translateX(-50%);
}

.risk-band h3 {
  max-width: 380px;
  margin-bottom: 0;
  font-size: clamp(1.45rem, 2.6vw, 2.2rem);
}

.risk-band .section-kicker {
  color: #8fddd8;
}

.risk-sequence {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem;
}

.risk-sequence span,
.risk-sequence strong {
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: center;
  padding: 0.7rem;
  border-radius: 14px;
  background: #507b95;
  font-size: 0.88rem;
  text-align: center;
}

.risk-sequence span:nth-child(2) { background: #5d9da0; }
.risk-sequence span:nth-child(3) { background: #6a9b78; }
.risk-sequence strong { background: var(--orange); }

.risk-sequence span:nth-child(2),
.risk-sequence span:nth-child(3) {
  color: var(--ink-deep);
}

.materials-section {
  background: linear-gradient(180deg, #e8f3f5 0%, var(--sky) 100%);
}

.materials-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.material-card {
  display: flex;
  min-height: 390px;
  flex-direction: column;
  align-items: flex-start;
  padding: 1.7rem;
  border: 1px solid rgba(49, 90, 115, 0.12);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: 0 12px 30px rgba(11, 52, 74, 0.08);
  transition: border-color 220ms ease, box-shadow 220ms ease, transform 220ms ease;
}

.material-card img {
  width: 76px;
  height: 76px;
  margin-bottom: 1.5rem;
  transition: filter 220ms ease, transform 220ms ease;
}

.material-card p:not(.file-type) {
  color: #55717f;
}

.material-card .file-type {
  margin-bottom: 0.45rem;
}

.download-link {
  display: flex;
  width: 100%;
  min-height: 46px;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: auto;
  padding-top: 1.1rem;
  border-top: 1px solid var(--border);
  color: var(--ink);
  font-weight: 780;
  text-decoration: none;
}

.download-link span {
  color: var(--orange);
  font-size: 1.4rem;
  transition: transform 220ms ease;
}

.institutional-section {
  background: var(--white);
}

.institutional-layout {
  display: grid;
  align-items: center;
  grid-template-columns: minmax(260px, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(2.25rem, 5vw, 4.5rem);
}

.institutional-links {
  display: grid;
  align-items: start;
  gap: 0.35rem;
}

.institutional-links a {
  width: fit-content;
  color: var(--petrol);
  font-weight: 650;
}

.institutional-logos {
  display: grid;
  align-items: center;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1rem;
}

.institutional-logos img {
  width: 100%;
  max-height: 68px;
  object-fit: contain;
}

.institutional-logos .logo-wide {
  max-height: 56px;
}

.institutional-logos p {
  margin: 0;
  color: var(--petrol);
  font-size: 0.92rem;
  line-height: 1.35;
}

footer {
  padding-block: 1.5rem;
  background: var(--ink-deep);
  color: #dceaf0;
  font-size: 0.9rem;
}

.footer-layout {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.6rem 2rem;
}

.footer-layout p {
  margin: 0;
}

footer a {
  color: var(--white);
}

a:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 4px;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 460ms ease, transform 460ms ease;
  transition-delay: var(--reveal-delay, 0ms);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (hover: hover) and (pointer: fine) {
  .button-primary:hover {
    box-shadow: 0 14px 28px rgba(199, 82, 36, 0.32);
    transform: translateY(-2px);
  }

  .material-card:hover {
    border-color: rgba(49, 90, 115, 0.24);
    box-shadow: 0 20px 40px rgba(11, 52, 74, 0.14);
    transform: translateY(-5px);
  }

  .material-card:hover img {
    filter: drop-shadow(0 6px 8px rgba(11, 52, 74, 0.14));
    transform: translateY(-2px) scale(1.035);
  }

  .material-card:hover .download-link span {
    transform: translateY(3px);
  }

  .method-card:hover {
    border-top-color: color-mix(in srgb, var(--card-color) 82%, var(--ink));
    box-shadow: 0 15px 34px color-mix(in srgb, var(--card-color) 18%, transparent);
    transform: translateY(-3px);
  }
}

.button-primary:focus-visible {
  box-shadow: 0 14px 28px rgba(199, 82, 36, 0.32);
  transform: translateY(-2px);
}

.material-card:has(.download-link:focus-visible) {
  border-color: rgba(49, 90, 115, 0.24);
  box-shadow: 0 20px 40px rgba(11, 52, 74, 0.14);
  transform: translateY(-5px);
}

.material-card:has(.download-link:focus-visible) img {
  filter: drop-shadow(0 6px 8px rgba(11, 52, 74, 0.14));
  transform: translateY(-2px) scale(1.035);
}

.material-card:has(.download-link:focus-visible) .download-link span {
  transform: translateY(3px);
}

@media (max-width: 1024px) {
  .hero-layout {
    gap: 2rem;
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  }

  .method-grid,
  .materials-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .institutional-logos {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .container {
    width: min(calc(100% - 2rem), var(--container));
  }

  .hero-header,
  .hero-layout {
    min-height: auto;
  }

  .hero-layout {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    padding-block: 2rem 3rem;
  }

  .hero-visual {
    width: 100%;
    min-height: 300px;
  }

  .map-shape {
    inset: 0 -12% 21% 2%;
  }

  .map-shape-secondary {
    inset: 49% 16% -8% -12%;
  }

  .hero-visual img {
    right: 3%;
    bottom: -2%;
    width: 37%;
  }

  .hero-visual::before {
    right: 3%;
    bottom: -2%;
    width: 37%;
  }

  .intro-layout,
  .risk-band,
  .institutional-layout {
    grid-template-columns: 1fr;
  }

  .risk-sequence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .institutional-logos {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-layout {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  h1 {
    font-size: 2.35rem;
  }

  .method-grid,
  .materials-grid {
    grid-template-columns: 1fr;
  }

  .method-card {
    min-height: auto;
  }

  .risk-sequence {
    grid-template-columns: 1fr;
  }

  .material-card {
    min-height: 350px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

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