/* ==========================================================================
   Layout - Structure responsive
   ========================================================================== */

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding-left: var(--container-padding-mobile);
    padding-right: var(--container-padding-mobile);
}

@media (min-width: 768px) {
    .container {
        padding-left: var(--container-padding-tablet);
        padding-right: var(--container-padding-tablet);
    }
}

@media (min-width: 1024px) {
    .container {
        padding-left: var(--container-padding-desktop);
        padding-right: var(--container-padding-desktop);
    }
}

/* Content wrapper (optimal reading width) */
.content {
    max-width: var(--content-max-width);
    margin: 0 auto;
}

/* Section */
.section {
    padding: clamp(3rem, 8vw, 6rem) 0;
}

.section:nth-child(even) {
    background-color: var(--color-neutral-light);
}

.section:nth-child(odd) {
    background-color: var(--color-white);
}

/* Section title */
.section__title {
    text-align: center;
    margin-bottom: var(--space-2xl);
    color: var(--color-neutral-dark);
}

.section__title::after {
    content: '';
    display: block;
    width: 80px;
    height: 2px;
    background-color: var(--color-primary);
    margin: var(--space-md) auto 0;
}

/* Section content */
.section__content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    text-align: center;
}

.section__intro {
    text-align: center;
    max-width: var(--content-max-width);
    margin: 0 auto var(--space-lg);
    color: var(--color-neutral-medium);
}

.section__note {
    text-align: center;
    margin-top: var(--space-xl);
    font-size: var(--font-size-sm);
    color: var(--color-neutral-medium);
    font-style: italic;
}

/* Grid system */
.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid--2-cols {
    grid-template-columns: 1fr;
}

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

.grid--3-cols {
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .grid--3-cols {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid--3-cols {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Flexbox utilities */
.flex {
    display: flex;
}

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

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

.flex-wrap {
    flex-wrap: wrap;
}

.justify-center {
    justify-content: center;
}

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

.align-center {
    align-items: center;
}

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

.gap-md {
    gap: var(--space-md);
}

.gap-lg {
    gap: var(--space-lg);
}

/* Spacing utilities */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.pt-sm { padding-top: var(--space-sm); }
.pt-md { padding-top: var(--space-md); }
.pt-lg { padding-top: var(--space-lg); }
.pt-xl { padding-top: var(--space-xl); }

.pb-sm { padding-bottom: var(--space-sm); }
.pb-md { padding-bottom: var(--space-md); }
.pb-lg { padding-bottom: var(--space-lg); }
.pb-xl { padding-bottom: var(--space-xl); }

/* Visibility utilities */
.hidden {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 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;
}