/* ============================================
   1. CSS Custom Properties
   ============================================ */

:root {
  /* Colors */
  --color-primary: #1B2A4A;
  --color-primary-light: #2D4A7A;
  --color-accent: #3B82F6;
  --color-accent-hover: #2563EB;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFC;
  --color-bg-dark: #0F172A;
  --color-text: #1E293B;
  --color-text-muted: #64748B;
  --color-border: #E2E8F0;
  --color-success: #10B981;
  --color-white: #FFFFFF;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: clamp(1.75rem, 2.5vw, 2.25rem);
  --text-5xl: clamp(2.25rem, 5vw, 3.5rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Other */
  --radius: 0.5rem;
  --radius-lg: 0.75rem;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 24px rgba(27, 42, 74, 0.08);
  --transition: 0.2s ease;
}

/* ============================================
   2. Reset / Base
   ============================================ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

/* ============================================
   3. Typography
   ============================================ */

h1, h2, h3 {
  color: var(--color-primary);
  line-height: 1.2;
  font-weight: 700;
}

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

/* ============================================
   4. Layout
   ============================================ */

.container {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.section-header {
  max-width: 720px;
  margin-bottom: var(--space-8);
}

.section-header p {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  margin-top: var(--space-4);
}

/* ============================================
   5. Components
   ============================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background-color var(--transition), transform 0.1s ease, border-color var(--transition);
  border: 2px solid transparent;
  font-family: inherit;
}

.btn:active {
  transform: scale(0.98);
}

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

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

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

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

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

.btn-white:hover {
  background-color: var(--color-bg-alt);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

.btn-full {
  width: 100%;
}

/* ============================================
   6. Header
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-4) 0;
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.site-header.is-scrolled {
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  padding: var(--space-2) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-primary);
  white-space: nowrap;
}

.logo-icon {
  color: var(--color-accent);
}

.main-nav ul {
  display: flex;
  gap: var(--space-6);
}

.main-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
  position: relative;
}

.main-nav a:hover {
  color: var(--color-primary);
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition);
}

.main-nav a:hover::after {
  width: 100%;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.header-cta {
  flex-shrink: 0;
}

/* ============================================
   7. Hero Banner
   ============================================ */

.hero-banner {
  padding: calc(var(--space-24) + 5rem) 0 var(--space-24);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  text-align: center;
}

.hero-banner-content {
  max-width: 820px;
  margin: 0 auto;
}

.hero-banner h1 {
  color: var(--color-white);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  line-height: 1.2;
  margin-bottom: var(--space-8);
}

.hero-link {
  color: var(--color-white);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(255, 255, 255, 0.5);
  transition: text-decoration-color var(--transition);
}

.hero-link:hover {
  text-decoration-color: var(--color-white);
}

.hero-banner-desc {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-lg);
  line-height: 1.7;
  margin-bottom: var(--space-8);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   8. Sections — Shared Styles
   ============================================ */

.section-logistics,
.section-onboarding {
  padding: var(--space-24) 0;
  background-color: var(--color-bg);
}

.section-gestion {
  padding: var(--space-24) 0;
  background-color: var(--color-bg-alt);
}

.section-intro {
  max-width: 820px;
  margin-bottom: var(--space-12);
}

.section-intro p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.section-intro strong {
  color: var(--color-text);
}

.section-cta {
  text-align: center;
  margin-top: var(--space-12);
}

.section-closing {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  font-style: italic;
  text-align: center;
  margin-top: var(--space-8);
}

/* ============================================
   9. Check Grid (Feature Lists)
   ============================================ */

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.check-grid--narrow {
  max-width: 900px;
}

.check-item {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition), transform var(--transition);
}

.section-gestion .check-item {
  background: var(--color-white);
}

.check-item:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.check-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(16, 185, 129, 0.06));
  border-radius: 50%;
  color: var(--color-success);
}

.check-item h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.check-item p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* ============================================
   10. Contact
   ============================================ */

.contact {
  padding: var(--space-24) 0;
  background-color: var(--color-bg-alt);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

.contact-text .section-header {
  margin-bottom: var(--space-8);
}

.contact-text .section-header p + p {
  margin-top: var(--space-2);
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact-detail {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.contact-detail svg {
  color: var(--color-accent);
  flex-shrink: 0;
}

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
}

.required {
  color: #EF4444;
}

.optional {
  color: var(--color-text-muted);
  font-weight: 400;
}

.form-group input,
.form-group textarea {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: var(--text-base);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
  background: var(--color-white);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.6;
}

.form-group textarea {
  resize: vertical;
}

.form-message {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 500;
}

.form-message--success {
  background: rgba(16, 185, 129, 0.1);
  color: #065F46;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.form-message--error {
  background: rgba(239, 68, 68, 0.1);
  color: #991B1B;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ============================================
   11. Footer
   ============================================ */

.site-footer {
  background-color: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-12) 0 var(--space-6);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: var(--space-8);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: var(--space-2);
}

.footer-brand p {
  font-size: var(--text-sm);
  max-width: 300px;
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  font-size: var(--text-sm);
  transition: color var(--transition);
}

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

.footer-bottom {
  padding-top: var(--space-6);
  text-align: center;
}

.footer-bottom p {
  font-size: var(--text-sm);
  opacity: 0.6;
}

/* ============================================
   12. Scroll Animations
   ============================================ */

.check-item,
.section-header {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.check-item.is-visible,
.section-header.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .check-item,
  .section-header {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ============================================
   13. Responsive
   ============================================ */

/* Mobile */
@media (max-width: 1023px) {
  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    height: 100dvh;
    background: var(--color-white);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    padding-top: 5rem;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
    z-index: 100;
  }

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

  .main-nav ul {
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-6);
  }

  .main-nav a {
    font-size: var(--text-base);
  }

  .nav-toggle {
    display: flex;
  }

  .header-cta {
    display: none;
  }

  .hero-banner {
    padding: calc(var(--space-24) + 3rem) 0 var(--space-16);
  }

  .hero-banner h1 {
    font-size: clamp(1.75rem, 6vw, 2.5rem);
  }

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

  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* Tablet */
@media (min-width: 640px) and (max-width: 1023px) {
  .check-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-8);
  }
}