/* ============================================
   Le Guide de la Taxe d'Apprentissage
   Stylesheet principal - Mobile First
   ============================================ */

/* --- Reset & Variables --- */
:root {
  --color-primary: #1a365d;
  --color-primary-light: #2b6cb0;
  --color-primary-lighter: #3182ce;
  --color-accent: #e53e3e;
  --color-accent-light: #fc8181;
  --color-bg: #ffffff;
  --color-bg-alt: #f7fafc;
  --color-bg-dark: #1a202c;
  --color-text: #2d3748;
  --color-text-light: #718096;
  --color-text-inverse: #ffffff;
  --color-border: #e2e8f0;
  --color-border-light: #edf2f7;
  --color-success: #38a169;
  --color-warning: #d69e2e;
  --color-info: #3182ce;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --max-width: 1200px;
  --header-height: 70px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 0.75em;
  font-weight: 700;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.6rem; margin-top: 2em; }
h3 { font-size: 1.3rem; margin-top: 1.5em; }
h4 { font-size: 1.1rem; }

p {
  margin-bottom: 1.2em;
}

ul, ol {
  margin-bottom: 1.2em;
  padding-left: 1.5em;
}

li {
  margin-bottom: 0.4em;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.container--narrow {
  max-width: 850px;
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
}

.site-logo:hover {
  color: var(--color-primary-light);
  text-decoration: none;
}

.site-logo__icon {
  font-size: 1.5rem;
}

.site-nav {
  display: none;
}

.site-nav ul {
  display: flex;
  list-style: none;
  gap: 1.75rem;
  padding: 0;
  margin: 0;
}

.site-nav a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.25rem 0;
  position: relative;
  text-decoration: none;
}

.site-nav a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary-light);
  transition: width 0.25s ease;
}

.site-nav a:hover::after,
.site-nav a.active::after {
  width: 100%;
}

.site-nav a:hover {
  color: var(--color-primary-light);
  text-decoration: none;
}

/* Mobile menu toggle */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.2s ease;
}

/* --- Hero --- */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-text-inverse);
  padding: 3rem 0;
  text-align: center;
}

.hero h1 {
  color: var(--color-text-inverse);
  font-size: 2rem;
  margin-bottom: 1rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 2rem;
}

.hero__badge {
  display: inline-block;
  background-color: rgba(255, 255, 255, 0.2);
  padding: 0.4rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s ease;
  border: none;
}

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

.btn--primary:hover {
  background-color: var(--color-bg-alt);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--color-primary);
}

.btn--secondary {
  background-color: var(--color-primary-light);
  color: var(--color-text-inverse);
}

.btn--secondary:hover {
  background-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--color-text-inverse);
}

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

.btn--outline:hover {
  background-color: var(--color-primary-light);
  color: var(--color-text-inverse);
  text-decoration: none;
}

/* --- Cards --- */
.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card__icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.card__title {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
}

.card__text {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.card__link {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-primary-light);
}

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

/* --- Stats Section --- */
.stats {
  background-color: var(--color-bg-alt);
  padding: 3rem 0;
}

.stats__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  text-align: center;
}

.stat__number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary-light);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat__label {
  font-size: 0.95rem;
  color: var(--color-text-light);
}

/* --- Article Content --- */
.article-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-text-inverse);
  padding: 2.5rem 0;
}

.article-header h1 {
  color: var(--color-text-inverse);
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.9rem;
  opacity: 0.85;
}

.article-content {
  padding: 2.5rem 0 4rem;
}

.article-content h2 {
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}

.article-content h2:first-of-type {
  margin-top: 0;
}

/* Breadcrumb */
.breadcrumb {
  padding: 1rem 0;
  font-size: 0.85rem;
}

.breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 0.25rem;
}

.breadcrumb li::after {
  content: "/";
  margin-left: 0.4rem;
  color: var(--color-text-light);
}

.breadcrumb li:last-child::after {
  content: "";
}

.breadcrumb a {
  color: var(--color-text-light);
}

.breadcrumb a:hover {
  color: var(--color-primary-light);
}

/* Table of Contents */
.toc {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 2rem;
  margin-bottom: 2.5rem;
}

.toc__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.toc ul {
  padding-left: 0;
  list-style: none;
}

.toc li {
  margin-bottom: 0.35rem;
}

.toc a {
  font-size: 0.9rem;
  color: var(--color-primary-light);
}

.toc a:hover {
  text-decoration: underline;
}

.toc ul ul {
  padding-left: 1.25rem;
  margin-top: 0.35rem;
}

/* Info boxes */
.info-box {
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  border-left: 4px solid;
}

.info-box--info {
  background-color: #ebf8ff;
  border-color: var(--color-info);
}

.info-box--warning {
  background-color: #fffff0;
  border-color: var(--color-warning);
}

.info-box--success {
  background-color: #f0fff4;
  border-color: var(--color-success);
}

.info-box--danger {
  background-color: #fff5f5;
  border-color: var(--color-accent);
}

.info-box__title {
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
}

.info-box--info .info-box__title { color: var(--color-info); }
.info-box--warning .info-box__title { color: var(--color-warning); }
.info-box--success .info-box__title { color: var(--color-success); }
.info-box--danger .info-box__title { color: var(--color-accent); }

.info-box p:last-child {
  margin-bottom: 0;
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

thead {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

th {
  padding: 0.85rem 1rem;
  text-align: left;
  font-weight: 600;
}

td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

tbody tr:nth-child(even) {
  background-color: var(--color-bg-alt);
}

tbody tr:hover {
  background-color: #edf2f7;
}

/* Formula box */
.formula-box {
  background-color: var(--color-bg-alt);
  border: 2px solid var(--color-primary-light);
  border-radius: var(--radius-md);
  padding: 1.5rem 2rem;
  margin: 1.5rem 0;
  text-align: center;
}

.formula-box__formula {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.formula-box__caption {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* --- Sections --- */
.section {
  padding: 3rem 0;
}

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

.section__title {
  text-align: center;
  margin-bottom: 0.5rem;
}

.section__subtitle {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Footer --- */
.site-footer {
  background-color: var(--color-bg-dark);
  color: #a0aec0;
  padding: 3rem 0 1.5rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer__title {
  color: var(--color-text-inverse);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.footer__links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer__links li {
  margin-bottom: 0.5rem;
}

.footer__links a {
  color: #a0aec0;
  font-size: 0.9rem;
}

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

.footer__bottom {
  border-top: 1px solid #2d3748;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: #718096;
}

/* --- Utility --- */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* --- Responsive --- */
@media (min-width: 640px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  h1 { font-size: 2.4rem; }
  .hero h1 { font-size: 2.4rem; }
  .article-header h1 { font-size: 2rem; }
}

@media (min-width: 768px) {
  .site-nav {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .hero {
    padding: 4.5rem 0;
  }

  .hero h1 {
    font-size: 2.8rem;
  }

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

  .stats__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .footer__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .article-header {
    padding: 3.5rem 0;
  }

  .article-header h1 {
    font-size: 2.4rem;
  }
}

@media (min-width: 1024px) {
  h1 { font-size: 2.8rem; }
  h2 { font-size: 1.8rem; }

  .hero {
    padding: 5.5rem 0;
  }

  .hero h1 {
    font-size: 3.2rem;
  }

  .section {
    padding: 4rem 0;
  }
}

/* --- Print --- */
@media print {
  .site-header,
  .site-footer,
  .menu-toggle {
    display: none;
  }

  body {
    font-size: 12pt;
    color: #000;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .hero {
    background: #f0f0f0;
    color: #000;
    padding: 1rem 0;
  }

  .hero h1 {
    color: #000;
  }
}