/* ============================================
   DETUNP — Modern Industrial Dark Theme
   Aluminum Foundry & Alloys
   ============================================ */

/* --- Fonts (self-hosted, variable woff2, latin subset) --- */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url('../fonts/inter-latin.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 500 700;
  font-display: swap;
  src: url('../fonts/spacegrotesk-latin.woff2') format('woff2');
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* --- Custom Properties --- */
:root {
  --bg-primary: #0a0a0b;
  --bg-surface: #111113;
  --bg-elevated: #1a1a1d;
  --text-primary: #e8e8e8;
  --text-secondary: #9a9a9a;
  --text-tertiary: #8a8a90;
  --accent: #c43034;
  --accent-hover: #d63a3e;
  --accent-light: #e2595d;
  --accent-subtle: rgba(196, 48, 52, 0.1);
  --border: #1e1e22;
  --border-light: #2a2a2e;

  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.84rem + 0.18vw, 0.9375rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.38vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
  --text-3xl: clamp(1.75rem, 1.3rem + 2.25vw, 2.5rem);
  --text-4xl: clamp(2.25rem, 1.5rem + 3.75vw, 3.5rem);
  --text-5xl: clamp(2.75rem, 1.8rem + 4.75vw, 4.5rem);

  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --section-padding: clamp(4rem, 8vw, 8rem);

  --container-max: 1100px;
  --container-padding: clamp(1.25rem, 4vw, 2rem);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

/* --- Base --- */
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

::selection {
  background-color: var(--accent);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 1000;
  padding: var(--space-sm) var(--space-lg);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top var(--duration-fast) var(--ease-out);
}

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

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-xl); }

p {
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 65ch;
}

.label {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-light);
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-inline: var(--container-padding);
}

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

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

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

.section__header .label {
  margin-bottom: var(--space-sm);
}

.section__header p {
  margin-top: var(--space-md);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.875rem 2rem;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius-sm);
  transition: all var(--duration-base) var(--ease-out);
  white-space: nowrap;
}

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

.btn--primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 0 20px rgba(196, 48, 52, 0.25);
}

.btn--outline {
  border: 1px solid var(--border-light);
  color: var(--text-primary);
}

.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

.btn__icon {
  width: 18px;
  height: 18px;
  transition: transform var(--duration-base) var(--ease-out);
}

.btn:hover .btn__icon {
  transform: translateX(3px);
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-block: var(--space-md);
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: transform var(--duration-slow) var(--ease-out),
              border-color var(--duration-base),
              background var(--duration-base);
}

.header--scrolled {
  border-bottom-color: var(--border);
  background: rgba(10, 10, 11, 0.95);
}

.header--hidden {
  transform: translateY(-100%);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-inline: var(--container-padding);
}

.nav__logo img {
  height: 36px;
  width: auto;
}

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

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--duration-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: width var(--duration-base) var(--ease-out);
}

.nav__link:hover,
.nav__link--active {
  color: var(--text-primary);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__cta { margin-left: var(--space-md); }

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  z-index: 101;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--duration-base) var(--ease-out);
  transform-origin: center;
}

.nav__toggle--active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__toggle--active span:nth-child(2) { opacity: 0; }
.nav__toggle--active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10, 10, 11, 0.92) 0%,
    rgba(10, 10, 11, 0.7) 50%,
    rgba(10, 10, 11, 0.5) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  padding-top: 6rem;
}

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

.hero__description {
  font-size: var(--text-lg);
  max-width: 50ch;
  margin: var(--space-xl) 0 var(--space-2xl);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* --- Nosotros --- */
.nosotros__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.nosotros__content p {
  margin-top: var(--space-md);
}

.nosotros__image {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

/* --- Productos --- */
.productos__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.producto {
  padding: var(--space-2xl);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--duration-base) var(--ease-out);
}

.producto:hover {
  border-color: var(--accent);
}

.producto__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  border-radius: var(--radius-sm);
  color: var(--accent);
  margin-bottom: var(--space-lg);
}

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

.producto h3 {
  margin-bottom: var(--space-md);
}

.producto__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-md);
  margin-bottom: var(--space-xl);
}

.producto__tag {
  padding: 0.3rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: 500;
  font-family: var(--font-heading);
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

/* --- Calidad --- */
.calidad__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.calidad__badge {
  width: 300px;
  height: auto;
  margin-bottom: var(--space-xl);
}

.calidad__content p {
  margin-top: var(--space-md);
}

/* --- Clientes --- */
.clientes__logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3xl);
  padding: var(--space-2xl);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.clientes__logos img {
  height: 160px;
  width: auto;
  opacity: 0.6;
  filter: grayscale(100%) brightness(1.8);
  transition: all var(--duration-base) var(--ease-out);
}

.clientes__logos img:hover {
  opacity: 1;
  filter: none;
}

/* --- Contacto --- */
.contacto__header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-3xl);
}

.contacto__header .label { margin-bottom: var(--space-sm); }
.contacto__header h2 { margin-bottom: var(--space-md); }
.contacto__header p { margin-inline: auto; }

.contacto__card {
  max-width: 920px;
  margin: 0 auto;
  padding: var(--space-2xl);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.contacto__items {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.contacto__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-md);
}

.contacto__item-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  border-radius: var(--radius-sm);
  color: var(--accent);
}

.contacto__item-icon svg {
  width: 18px;
  height: 18px;
}

.contacto__item-label {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}

.contacto__item-value {
  font-size: var(--text-sm);
  color: var(--text-primary);
}

.contacto__item-value a {
  transition: color var(--duration-fast);
}

.contacto__item-value a:hover {
  color: var(--accent);
}

/* --- Footer --- */
.footer {
  padding-block: var(--space-2xl);
  border-top: 1px solid var(--border);
  text-align: center;
}

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

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.fade-in--visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in--delay-1 { transition-delay: 100ms; }
.fade-in--delay-2 { transition-delay: 200ms; }
.fade-in--delay-3 { transition-delay: 300ms; }

@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* --- Media Queries --- */

@media (min-width: 30em) {
  .productos__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 48em) {
  .nav__toggle { display: none; }

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

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

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

@media (max-width: 47.99em) {
  .nav__toggle { display: flex; }

  .nav__menu {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-2xl);
    background: rgba(10, 10, 11, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-base), visibility var(--duration-base);
  }

  .nav__menu--open {
    opacity: 1;
    visibility: visible;
  }

  .nav__menu .nav__link { font-size: var(--text-xl); }
  .nav__cta { margin-left: 0; }
}