/**
 * LAYOUT.CSS
 * Structure générale, layout, containers
 * Grid et Flexbox pour sections principales
 */

/* ============================================
   CONTAINERS
   ============================================ */

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

.container--narrow {
    max-width: 960px;
}

.container--wide {
    max-width: 1440px;
}

/* ============================================
   SECTION STRUCTURE
   ============================================ */

.section {
    padding: var(--spacing-16) 0;
}

.section--dark {
    background-color: var(--color-bg-dark);
    color: var(--color-text-on-dark);
}

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

.section--offset {
    background-color: #f3f4f6;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.section__header {
    text-align: center;
    margin-bottom: var(--spacing-12);
}

.section__title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-4);
}

.section--dark .section__title {
    color: var(--color-text-on-dark);
}

.section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.section--dark .section__subtitle {
    color: var(--color-text-light);
}

/* ============================================
   HEADER
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
    box-shadow: 0 10px 35px rgba(15, 23, 42, 0.08);
    z-index: var(--z-fixed);
    transition: height var(--transition-base) var(--ease-out),
                box-shadow var(--transition-base) var(--ease-out);
}

.header--scrolled {
    height: var(--header-height-scrolled);
}

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

.header__logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-4);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    text-decoration: none;
}

.header__logo-mark {
    width: 48px;
    height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: linear-gradient(135deg, #0f172a 0%, #1d4ed8 100%);
    color: white;
    box-shadow: 0 16px 30px rgba(30, 64, 175, 0.22);
}

.header__logo-mark svg {
    width: 28px;
    height: 28px;
}

.header__brand {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.header__brand-name {
    font-size: 1.0625rem;
    font-weight: 700;
    color: #0f172a;
    line-height: 1.1;
}

.header__brand-meta {
    font-size: 0.72rem;
    font-weight: 600;
    color: #64748b;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.header__nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
}

.header__menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-6);
}

#language-switcher {
    display: flex;
    align-items: center;
}

.header .language-switcher {
    min-width: 168px;
}

.header .comparator-badge {
    min-height: 44px;
    padding-inline: 1rem;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.03);
    border-color: rgba(15, 23, 42, 0.08);
}

.header__link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast) var(--ease-out);
    position: relative;
}

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

.header__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-base) var(--ease-out);
}

.header__link:hover::after {
    width: 100%;
}

/* Mobile menu toggle */
.header__toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-2);
}

.header__toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition-base) var(--ease-out);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg,
                var(--color-primary-dark) 0%,
                var(--color-primary) 50%,
                var(--color-primary-light) 100%);
    background-size: 200% 200%;
    animation: gradientShift 15s ease infinite;
    color: var(--color-text-on-dark);
    padding-top: var(--header-height);
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero__container {
    display: grid;
    gap: var(--spacing-12);
    max-width: 900px;
    text-align: center;
    margin: 0 auto;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    backdrop-filter: blur(10px);
}

.hero__title {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-6);
}

.hero__description {
    font-size: var(--font-size-xl);
    color: rgba(255, 255, 255, 0.9);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-8);
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-4);
    justify-content: center;
}

/* ============================================
   STATS BAR
   ============================================ */

.stats {
    padding: var(--spacing-12) 0;
    background-color: var(--color-bg-light);
}

.stats__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
    text-align: center;
}

.stats__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-2);
}

.stats__value {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
}

.stats__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   GRIDS
   ============================================ */

.grid {
    display: grid;
    gap: var(--spacing-6);
}

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

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

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

.grid--auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    background-color: var(--color-bg-dark);
    color: #d1d5db;
    padding: var(--spacing-16) 0 var(--spacing-8);
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-12);
    margin-bottom: var(--spacing-12);
}

.footer__brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.footer__logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-4);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: white;
}

.footer__brand-mark {
    width: 48px;
    height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.14), rgba(96, 165, 250, 0.18));
    color: white;
}

.footer__brand-copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.footer__brand-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: white;
    line-height: 1.1;
}

.footer__brand-meta {
    font-size: 0.72rem;
    font-weight: 600;
    color: #93c5fd;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.footer__description {
    color: #d1d5db;
    line-height: var(--line-height-relaxed);
    max-width: 300px;
}

.footer__column h4 {
    color: white;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-4);
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.footer__link {
    color: #9ca3af;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast) var(--ease-out);
}

.footer__link:hover {
    color: #dbeafe;
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__copyright {
    font-size: var(--font-size-sm);
    color: #9ca3af;
}

.footer__social {
    display: flex;
    gap: var(--spacing-4);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.flex {
    display: flex;
}

.flex--center {
    align-items: center;
    justify-content: center;
}

.flex--between {
    justify-content: space-between;
}

.flex--column {
    flex-direction: column;
}

.gap-2 { gap: var(--spacing-2); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }
.gap-8 { gap: var(--spacing-8); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-2 { margin-bottom: var(--spacing-2); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-6 { margin-bottom: var(--spacing-6); }
.mb-8 { margin-bottom: var(--spacing-8); }
.mb-12 { margin-bottom: var(--spacing-12); }

.mt-2 { margin-top: var(--spacing-2); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-6 { margin-top: var(--spacing-6); }
.mt-8 { margin-top: var(--spacing-8); }

/* Text colors */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-white { color: white; }

/* Padding */
.p-2 { padding: var(--spacing-2); }
.p-4 { padding: var(--spacing-4); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }

/* Links */
.link {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast) var(--ease-out);
}

.link:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}