/* ============================================================
   LAYOUT.CSS — Global Layout, Reset, Navigation, & Footer
   Blog/Vlog: Deforestación en Áncash, Perú
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: var(--fw-regular);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--color-text);
  letter-spacing: var(--ls-tight);
}

::selection {
  background-color: rgba(var(--color-primary-rgb), 0.20);
  color: var(--color-text);
}

/* ---------- Reading Progress Bar ---------- */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: var(--progress-height);
  background: var(--gradient-primary);
  z-index: var(--z-max);
  transition: none;
  will-change: width;
}

/* ---------- Skip Link (A11y) ---------- */
.skip-link {
  position: fixed;
  top: -100%;
  left: var(--space-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-xs) var(--space-md);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: var(--fw-semibold);
  z-index: var(--z-max);
  transition: top var(--transition-fast);
}

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

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

/* ---------- Main Navigation ---------- */
.navbar {
  position: fixed;
  top: var(--progress-height);
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-glass-border);
  z-index: var(--z-fixed);
  transition: background var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-base);
}

.navbar.scrolled {
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-wide);
  padding-inline: var(--gutter);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-heading);
  font-size: var(--fs-h4);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  white-space: nowrap;
}

.navbar__brand svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.navbar__link {
  position: relative;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  white-space: nowrap;
}

.navbar__link:hover {
  color: var(--color-primary);
  background-color: rgba(var(--color-primary-rgb), 0.08);
}

.navbar__link.active {
  color: var(--color-primary);
  font-weight: var(--fw-semibold);
}

.navbar__link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 18px;
  height: 3px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

/* — Nav Actions (Theme Toggle + Search + Mobile Toggle) — */
.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.navbar__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.navbar__btn:hover {
  color: var(--color-primary);
  background-color: rgba(var(--color-primary-rgb), 0.10);
}

.navbar__btn svg {
  width: 20px;
  height: 20px;
}

/* — Mobile Menu Toggle — */
.navbar__toggle {
  display: none;
}

/* — Mobile Menu — */
@media (max-width: 1024px) {
  .navbar__links {
    position: fixed;
    top: calc(var(--nav-height) + var(--progress-height));
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-lg) var(--gutter);
    background: var(--color-surface);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    z-index: var(--z-overlay);
  }

  .navbar__links.open {
    transform: translateX(0);
  }

  .navbar__link {
    padding: var(--space-md) var(--space-lg);
    font-size: var(--fs-body);
    border-radius: var(--radius-md);
  }

  .navbar__link.active::after {
    display: none;
  }

  .navbar__toggle {
    display: flex;
  }
}

/* ---------- Section Base ---------- */
.section {
  padding-block: var(--space-4xl);
  position: relative;
}

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

.section__header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section__overline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: var(--ls-caps);
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.section__title {
  font-size: var(--fs-h2);
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.section__subtitle {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-inline: auto;
  line-height: var(--lh-relaxed);
}

/* ---------- Hero Section ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  color: #FFFFFF;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: var(--z-below);
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  will-change: transform;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 860px;
  padding: var(--space-xl) var(--gutter);
}

.hero__title {
  font-size: var(--fs-hero);
  font-weight: var(--fw-black);
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.35);
  color: #FFFFFF;
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: var(--fw-regular);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-2xl);
  opacity: 0.92;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.25);
  max-width: 640px;
  margin-inline: auto;
  color: #FFFFFF;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-xl);
  font-family: var(--font-heading);
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  color: #FFFFFF;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transition: transform var(--transition-spring), box-shadow var(--transition-base);
}

.hero__cta:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  color: #FFFFFF;
}

.hero__cta svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-base);
}

.hero__cta:hover svg {
  transform: translateY(3px);
}

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  animation: bounceDown 2s ease-in-out infinite;
  opacity: 0.7;
  color: #FFFFFF;
}

@keyframes bounceDown {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%      { transform: translateX(-50%) translateY(10px); }
}

/* ---------- Footer ---------- */
.footer {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-3xl) var(--space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-heading);
  font-size: var(--fs-h4);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.footer__brand svg {
  width: 24px;
  height: 24px;
}

.footer__desc {
  color: var(--color-text-secondary);
  font-size: var(--fs-small);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-lg);
}

.footer__heading {
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: var(--ls-caps);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.footer__link {
  display: block;
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  padding-block: var(--space-2xs);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-primary);
  padding-left: var(--space-xs);
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__copy {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.footer__credits {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

/* — Footer Responsive — */
@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #FFFFFF;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition-base),
              visibility var(--transition-base),
              transform var(--transition-base),
              background-color var(--transition-fast);
  z-index: var(--z-sticky);
}

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

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
}

.back-to-top svg {
  width: 22px;
  height: 22px;
}

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Staggered children */
.stagger > .reveal:nth-child(1)  { transition-delay: 0ms; }
.stagger > .reveal:nth-child(2)  { transition-delay: 80ms; }
.stagger > .reveal:nth-child(3)  { transition-delay: 160ms; }
.stagger > .reveal:nth-child(4)  { transition-delay: 240ms; }
.stagger > .reveal:nth-child(5)  { transition-delay: 320ms; }
.stagger > .reveal:nth-child(6)  { transition-delay: 400ms; }
.stagger > .reveal:nth-child(7)  { transition-delay: 480ms; }
.stagger > .reveal:nth-child(8)  { transition-delay: 560ms; }

/* ---------- Responsive Utilities ---------- */
@media (max-width: 480px) {
  .section {
    padding-block: var(--space-2xl);
  }
  .section__header {
    margin-bottom: var(--space-xl);
  }
}