/* ============================================================
   Helmet Digital System - Main Stylesheet
   Mobile-first responsive design with CSS custom properties
   ============================================================ */

/* --- Custom Properties (Appendix A) --- */
:root {
  /* Primary brand */
  --color-primary: #b6bc00;
  --color-primary-dark: #8e9300;
  --color-primary-light: #d4d94d;

  /* Dark palette */
  --color-dark: #1a1a2e;
  --color-dark-mid: #16213e;
  --color-dark-blue: #0f3460;

  /* Neutrals */
  --color-white: #ffffff;
  --color-light: #f8f9fa;
  --color-gray-100: #e9ecef;
  --color-gray-600: #6c757d;
  --color-gray-900: #212529;

  /* Spacing scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-section: 8rem;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-hero: 3.5rem;
  --line-height-base: 1.6;
  --line-height-heading: 1.2;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;
  --border-radius: 8px;
  --border-radius-lg: 16px;

  /* Transitions */
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-gray-900);
  padding-top: var(--nav-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 1rem;
  line-height: var(--line-height-heading);
  font-weight: 700;
}

p {
  margin: 0 0 1rem;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

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

button {
  font: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

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

address {
  font-style: normal;
}

/* --- Typography --- */
h1 {
  font-size: clamp(2rem, 5vw, var(--font-size-hero));
}

h2 {
  font-size: var(--font-size-2xl);
  text-align: center;
  margin-bottom: var(--space-md);
}

h3 {
  font-size: var(--font-size-xl);
}

/* --- Utility Classes --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

.section {
  padding: var(--space-lg) var(--space-sm);
}

.section__container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__container--narrow {
  max-width: 800px;
}

.section__intro {
  max-width: 800px;
  margin: 0 auto var(--space-lg);
  text-align: center;
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
}

.section__subheading {
  text-align: center;
  color: var(--color-gray-600);
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-lg);
}

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

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

.section--dark .section__subheading {
  color: var(--color-gray-100);
}

/* --- Button Component --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: background-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  border: none;
  text-align: center;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-dark);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  transform: scale(1.02);
}

.btn--loading {
  pointer-events: none;
  opacity: 0.7;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  background: transparent;
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.nav--scrolled {
  background: var(--color-dark);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo img {
  height: 40px;
  width: auto;
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  z-index: 1001;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav--open .nav__toggle span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav--open .nav__toggle span:nth-child(2) {
  opacity: 0;
}

.nav--open .nav__toggle span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.nav__links {
  position: fixed;
  top: var(--nav-height);
  right: 0;
  width: 100%;
  height: calc(100vh - var(--nav-height));
  background: var(--color-dark);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  transform: translateX(100%);
  transition: transform var(--transition-base);
}

.nav--open .nav__links {
  transform: translateX(0);
}

.nav__links a {
  color: var(--color-white);
  font-size: var(--font-size-lg);
  font-weight: 500;
  transition: color var(--transition-base);
}

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

.btn--nav {
  margin-top: var(--space-sm);
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  text-align: center;
  padding: var(--space-lg) var(--space-sm);
  margin-top: calc(-1 * var(--nav-height));
}

.hero__content {
  max-width: 700px;
}

.hero__logo {
  max-width: 140px;
  margin: 0 auto var(--space-md);
}

.hero__title {
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.hero__tagline {
  color: var(--color-primary-light);
  font-size: var(--font-size-lg);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.hero__subtagline {
  color: var(--color-gray-100);
  margin-bottom: var(--space-md);
}

.btn--hero {
  margin-top: var(--space-sm);
}

/* Hero fade-in animation */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__logo,
.hero__title,
.hero__tagline,
.hero__subtagline,
.btn--hero {
  animation: fadeInUp 0.8s ease forwards;
  opacity: 0;
}

.hero__logo { animation-delay: 0s; }
.hero__title { animation-delay: 0.2s; }
.hero__tagline { animation-delay: 0.4s; }
.hero__subtagline { animation-delay: 0.5s; }
.btn--hero { animation-delay: 0.6s; }

/* --- Galeno Feature Cards --- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.feature-card {
  background: var(--color-white);
  padding: var(--space-md);
  border-radius: var(--border-radius-lg);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid var(--color-gray-100);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.feature-card__icon {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.feature-card__title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xs);
}

.feature-card__desc {
  color: var(--color-gray-600);
  margin-bottom: 0;
}

.galeno-screenshot {
  margin: var(--space-lg) auto;
  max-width: 900px;
  text-align: center;
}

.galeno-screenshot img {
  margin: 0 auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
  border-radius: var(--border-radius-lg);
}

.galeno-screenshot figcaption {
  margin-top: var(--space-sm);
  color: var(--color-gray-600);
  font-size: 0.875rem;
}

/* --- Servizi ECM Section --- */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  text-align: center;
}

.service-card {
  padding: var(--space-md);
  border-radius: var(--border-radius);
  transition: transform var(--transition-base), background-color var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.05);
}

.service-card i {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  display: block;
}

.service-card h3 {
  margin-bottom: var(--space-xs);
}

.service-card p {
  color: var(--color-gray-100);
  margin-bottom: 0;
}

.section--dark .btn {
  display: block;
  max-width: 200px;
  margin: 0 auto;
}

/* --- Chi Siamo Section --- */
.section__container--narrow {
  text-align: center;
}

.section__container--narrow p {
  text-align: left;
  margin-bottom: 1.5rem;
  line-height: var(--line-height-base);
}

.section__container--narrow address {
  margin-top: var(--space-md);
  padding: var(--space-sm);
  background: var(--color-white);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--color-primary);
  text-align: left;
}

/* --- Contact Section --- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.form-group {
  margin-bottom: var(--space-sm);
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  font-size: 0.875rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-gray-100);
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-base), outline var(--transition-base);
  background: var(--color-white);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.form-group input:invalid:not(:placeholder-shown),
.form-group textarea:invalid:not(:placeholder-shown) {
  border-color: #dc3545;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.btn--submit {
  width: 100%;
  margin-top: var(--space-sm);
}

#form-status {
  margin-top: var(--space-sm);
  padding: 0;
  border-radius: var(--border-radius);
  font-weight: 500;
  text-align: center;
}

#form-status.form-status--success {
  padding: var(--space-sm);
  background: #d4edda;
  color: #155724;
}

#form-status.form-status--error {
  padding: var(--space-sm);
  background: #f8d7da;
  color: #721c24;
}

/* Contact Info Sidebar */
.contact-info h3 {
  margin-bottom: var(--space-sm);
}

.contact-info__list {
  margin: 0;
}

.contact-info__list dt {
  font-weight: 600;
  margin-top: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.contact-info__list dd {
  margin: var(--space-xs) 0 0 0;
}

.contact-info__list a {
  color: var(--color-primary-dark);
  font-weight: 500;
  transition: color var(--transition-base);
}

.contact-info__list a:hover {
  color: var(--color-primary);
}

/* --- Footer --- */
.footer {
  background: var(--color-dark);
  color: var(--color-white);
  padding: var(--space-lg) var(--space-sm);
  text-align: center;
  position: relative;
}

.footer__container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.footer__copyright {
  color: var(--color-gray-600);
  font-size: 0.875rem;
  margin: 0;
}

.footer__social {
  display: flex;
  gap: var(--space-sm);
}

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  transition: background-color var(--transition-base), transform var(--transition-base);
}

.footer__social a:hover {
  background: var(--color-primary);
  color: var(--color-dark);
  transform: scale(1.1);
}

.back-to-top {
  position: fixed;
  bottom: var(--space-md);
  right: var(--space-md);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  transform: scale(1.1);
}

/* --- Scroll Animations --- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.no-js-animations .animate-on-scroll {
  opacity: 1;
  transform: none;
}

/* --- Responsive: Tablet (768px+) --- */
@media (min-width: 768px) {
  .section {
    padding: var(--space-xl) var(--space-md);
  }

  .container {
    padding: 0 var(--space-md);
  }

  .nav__container {
    padding: 0 var(--space-md);
  }

  .nav__toggle {
    display: none;
  }

  .nav__links {
    position: static;
    width: auto;
    height: auto;
    background: transparent;
    flex-direction: row;
    transform: none;
    gap: var(--space-md);
  }

  .nav__links a {
    font-size: var(--font-size-base);
  }

  .btn--nav {
    margin-top: 0;
  }

  .hero__logo {
    max-width: 160px;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .btn--submit {
    width: auto;
  }

  .footer__container {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* --- Responsive: Desktop (1024px+) --- */
@media (min-width: 1024px) {
  .section {
    padding: var(--space-section) var(--space-md);
  }

  h2 {
    font-size: var(--font-size-3xl);
  }

  .hero__logo {
    max-width: 180px;
  }

  .features-grid {
    grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
  }

  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .contact-layout {
    grid-template-columns: 1fr 1fr;
  }
}

/* --- Responsive: Large Desktop (1200px+) --- */
@media (min-width: 1200px) {
  .section__container {
    padding: 0 var(--space-md);
  }

  .hero__content {
    max-width: 800px;
  }
}

/* --- Accessibility --- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: -1;
}

.skip-link:focus {
  position: fixed;
  top: 10px;
  left: 10px;
  width: auto;
  height: auto;
  overflow: visible;
  z-index: 9999;
  padding: 1rem;
  background: var(--color-primary);
  color: var(--color-dark);
  font-weight: 700;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}