/* ============================================
   MBRANE Landing Page - Main Styles
   Style guide: Colors, typography, spacing, BEM
   ============================================ */

/* --- Custom Properties (Design Tokens) --- */
:root {
  /* Colors - Main */
  --color-black: #000;
  --color-white: #fff;
  --color-primary: #0015d1;
  --color-primary-light: #3785e6;
  --color-secondary: #b0b0b0;
  --color-accent: #3785e6;
  --color-light-soft: #ededed;
  --color-dark-soft: #b0b0b0;

  /* Semantic */
  --color-success: #198754;
  --color-warning: #ffc107;
  --color-error: #dc3545;
  --color-info: #0dcaf0;

  /* Neutral */
  --color-bg: #fff;
  --color-text: #000;
  --color-text-secondary: #adb5bd;
  --color-border: #adb5bd;

  /* Typography */
  --font-primary: 'Montserrat', sans-serif;
  --font-base: 1rem;
  --font-scale-xs: 0.875rem;
  --font-scale-sm: 1rem;
  --font-scale-md: 1.25rem;
  --font-scale-lg: 1.5rem;
  --font-scale-xl: 2rem;
  --font-scale-2xl: 2.5rem;
  --font-scale-3xl: 3rem;
  --line-height-body: 1.5;
  --line-height-heading: 1.2;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Layout */
  --container-max: 1200px;
  --header-height: 4rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-base);
  line-height: var(--line-height-body);
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

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

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-xl);
  }
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--color-white);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  z-index: 1000;
}

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

@media (min-width: 768px) {
  .header__inner {
    padding-inline: var(--space-xl);
  }
}

.header__logo {
  display: flex;
  align-items: center;
}

.header__logo-text {
  font-size: var(--font-scale-lg);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
}

.header__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 2.5rem;
  height: 2.5rem;
  background: none;
  border: none;
  cursor: pointer;
}

@media (min-width: 768px) {
  .header__toggle {
    display: none;
  }
}

.header__toggle-bar {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--color-primary);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

.nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--color-white);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
}

@media (min-width: 768px) {
  .nav {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
  }
}

.nav.is-open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav__list {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  gap: var(--space-sm);
}

@media (min-width: 768px) {
  .nav__list {
    flex-direction: row;
    padding: 0;
    gap: var(--space-xl);
  }
}

.nav__link {
  font-weight: 500;
  color: var(--color-text);
  padding: var(--space-sm) 0;
  transition: color 0.2s ease;
}

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

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--header-height);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  z-index: -2;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: -1;
}

.hero__content {
  text-align: center;
  color: var(--color-white);
  padding: var(--space-xl);
}

.hero__title {
  font-size: var(--font-scale-xl);
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-bottom: var(--space-md);
}

@media (min-width: 768px) {
  .hero__title {
    font-size: var(--font-scale-3xl);
  }
}

.hero__brand {
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero__tagline {
  font-size: var(--font-scale-md);
  margin-bottom: var(--space-xl);
  opacity: 0.95;
}

.hero__cta {
  display: inline-block;
}

/* --- Buttons --- */
.button {
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-primary);
  font-size: var(--font-scale-sm);
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.button--primary {
  background-color: var(--color-white);
  color: var(--color-primary);
  border: 2px solid var(--color-white);
}

.button--primary:hover {
  background-color: transparent;
  color: var(--color-white);
}

.button--outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.button--outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* --- Sections --- */
.section-title {
  font-size: var(--font-scale-xl);
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-bottom: var(--space-md);
}

.section-title--centered {
  text-align: center;
}

.section-title--light {
  color: var(--color-white);
}

.section-subtitle {
  font-size: var(--font-scale-md);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
}

.section-subtitle--light {
  color: rgba(255, 255, 255, 0.9);
}

/* --- About --- */
.about {
  padding: var(--space-3xl) 0;
}

.about__grid {
  display: grid;
  gap: var(--space-2xl);
  align-items: center;
}

@media (min-width: 768px) {
  .about__grid {
    grid-template-columns: 1fr 1fr;
  }
}

.about__text {
  margin-bottom: var(--space-xl);
  max-width: 60ch;
}

.about__image img {
  border-radius: 8px;
}

/* --- Products --- */
.products {
  padding: var(--space-3xl) 0;
  background-color: var(--color-light-soft);
}

.products__grid {
  display: grid;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .products__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .products__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.product-card {
  background-color: var(--color-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.product-card__image img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.product-card__title {
  font-size: var(--font-scale-md);
  font-weight: 700;
  padding: var(--space-md);
  padding-bottom: var(--space-sm);
}

.product-card__desc {
  font-size: var(--font-scale-sm);
  color: var(--color-text-secondary);
  padding: 0 var(--space-md) var(--space-md);
}

/* --- Testimonials --- */
.testimonials {
  padding: var(--space-3xl) 0;
  background-color: var(--color-primary);
}

.testimonials__grid {
  display: grid;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .testimonials__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.testimonial-card {
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: var(--space-xl);
  color: var(--color-white);
}

.testimonial-card__quote {
  font-size: var(--font-scale-md);
  margin-bottom: var(--space-lg);
  font-style: italic;
}

.testimonial-card__author {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.testimonial-card__author cite {
  font-weight: 700;
  font-style: normal;
}

.testimonial-card__author span {
  font-size: var(--font-scale-xs);
  opacity: 0.9;
}

/* --- Legacy --- */
.legacy {
  padding: var(--space-3xl) 0;
}

.legacy__timeline {
  display: grid;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .legacy__timeline {
    grid-template-columns: repeat(4, 1fr);
  }
}

.legacy__item {
  text-align: center;
  padding: var(--space-lg);
  border-left: 3px solid var(--color-primary);
}

@media (min-width: 768px) {
  .legacy__item {
    border-left: none;
    border-top: 3px solid var(--color-primary);
    padding-top: var(--space-xl);
  }
}

.legacy__year {
  display: block;
  font-size: var(--font-scale-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.legacy__title {
  font-size: var(--font-scale-md);
  margin-bottom: var(--space-sm);
}

.legacy__desc {
  font-size: var(--font-scale-sm);
  color: var(--color-text-secondary);
}

/* --- News --- */
.news {
  padding: var(--space-3xl) 0;
  background-color: var(--color-light-soft);
}

.news__grid {
  display: grid;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .news__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.news-card {
  background-color: var(--color-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: transform 0.2s ease;
}

.news-card:hover {
  transform: translateY(-4px);
}

.news-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.news-card__content {
  padding: var(--space-lg);
}

.news-card__title {
  font-size: var(--font-scale-md);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.news-card__meta {
  font-size: var(--font-scale-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.news-card__link {
  color: var(--color-primary);
  font-weight: 600;
}

.news-card__link:hover {
  text-decoration: underline;
}

/* --- Footer --- */
.footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  background-color: var(--color-black);
  color: var(--color-white);
}

.footer__grid {
  display: grid;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer__logo {
  font-size: var(--font-scale-lg);
  font-weight: 700;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: var(--space-sm);
}

.footer__brand p {
  color: var(--color-dark-soft);
  font-size: var(--font-scale-sm);
}

.footer__heading {
  font-size: var(--font-scale-md);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.footer__links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__links a {
  color: var(--color-dark-soft);
}

.footer__links a:hover {
  color: var(--color-white);
}

.footer__contact p {
  color: var(--color-dark-soft);
  font-size: var(--font-scale-sm);
}

.footer__bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer__bottom p {
  font-size: var(--font-scale-xs);
  color: var(--color-dark-soft);
}