/* =============================================
   VOLT INSIGHTS — Folha de Estilos Principal
   Estilo: Minimalista / Jornalístico / Tech
   ============================================= */

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --brand-blue:    #2563EB;
    --brand-green:   #059669;
    --brand-dark:    #1F2937;
    --gray-50:       #F9FAFB;
    --gray-100:      #F3F4F6;
    --gray-200:      #E5E7EB;
    --gray-400:      #9CA3AF;
    --gray-500:      #6B7280;
    --gray-600:      #4B5563;
    --white:         #FFFFFF;
    --font-sans:     'Inter', sans-serif;
    --font-serif:    'Lora', serif;
    --max-width:     1280px;
    --radius-sm:     0.5rem;
    --radius-lg:     1rem;
    --radius-xl:     1.25rem;
    --transition:    0.2s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--white);
    color: var(--brand-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    line-height: 1.2;
}

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

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

ul {
    list-style: none;
}

/* ---------- Layout ---------- */
.container {
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: 1rem;
}

@media (min-width: 640px)  { .container { padding-inline: 1.5rem; } }
@media (min-width: 1024px) { .container { padding-inline: 2rem; } }

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 5rem;
}

/* Logo */
.logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--brand-dark);
    flex-shrink: 0;
}

.logo span {
    color: var(--brand-green);
}

/* Nav */
.site-nav {
    display: none;
    gap: 2rem;
}

@media (min-width: 768px) {
    .site-nav {
        display: flex;
        align-items: center;
    }
}

.site-nav a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    transition: color var(--transition);
}

.site-nav a:hover {
    color: var(--brand-green);
}

/* Search */
.header-search {
    display: none;
    position: relative;
}

@media (min-width: 1024px) {
    .header-search {
        display: block;
    }
}

.header-search svg {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1.25rem;
    height: 1.25rem;
    color: var(--gray-400);
    pointer-events: none;
}

.header-search input {
    display: block;
    width: 16rem;
    padding: 0.5rem 0.75rem 0.5rem 2.5rem;
    border: 1px solid var(--gray-100);
    border-radius: 9999px;
    background: var(--gray-50);
    font-size: 0.875rem;
    font-family: var(--font-sans);
    color: var(--brand-dark);
    outline: none;
    transition: box-shadow var(--transition), border-color var(--transition);
    cursor: default;
}

.header-search input:focus {
    border-color: var(--brand-green);
    box-shadow: 0 0 0 2px rgba(5, 150, 105, 0.15);
}

/* Mobile menu button */
.mobile-menu-btn {
    display: flex;
    align-items: center;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray-500);
    padding: 0.25rem;
}

.mobile-menu-btn svg {
    width: 1.5rem;
    height: 1.5rem;
}

@media (min-width: 768px) {
    .mobile-menu-btn {
        display: none;
    }
}

/* ---------- Main Content ---------- */
.site-main {
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: 1rem;
    padding-block: 2.5rem;
}

@media (min-width: 640px)  { .site-main { padding-inline: 1.5rem; } }
@media (min-width: 1024px) { .site-main { padding-inline: 2rem; } }

/* ---------- Featured Article ---------- */
.section-featured {
    margin-bottom: 4rem;
}

.featured-grid {
    display: grid;
    gap: 2.5rem;
    align-items: center;
}

@media (min-width: 1024px) {
    .featured-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.featured-image-wrap {
    aspect-ratio: 16 / 9;
    background: var(--gray-100);
    overflow: hidden;
    border-radius: var(--radius-lg);
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.featured-image-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.featured-image-wrap:hover img {
    transform: scale(1.03);
}

.featured-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(5, 150, 105, 0.1);
    color: var(--brand-green);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: 9999px;
}

.meta-date {
    font-size: 0.75rem;
    color: var(--gray-400);
}

.featured-title {
    font-size: clamp(1.75rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    cursor: pointer;
    transition: color var(--transition);
}

.featured-title:hover {
    color: var(--brand-blue);
}

.featured-excerpt {
    color: var(--gray-600);
    font-size: 1.125rem;
    margin-bottom: 2rem;
    line-height: 1.7;
}

/* Read more link */
.read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--brand-blue);
    font-weight: 600;
    font-size: 0.95rem;
    transition: gap var(--transition);
}

.read-more:hover {
    gap: 0.75rem;
    text-decoration: underline;
}

.read-more svg {
    width: 1rem;
    height: 1rem;
    transition: transform var(--transition);
}

.read-more:hover svg {
    transform: translateX(4px);
}

/* ---------- Articles Grid Section ---------- */
.section-grid {
    margin-bottom: 5rem;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    border-left: 4px solid var(--brand-green);
    padding-left: 1rem;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

.section-header a {
    font-size: 0.875rem;
    color: var(--gray-500);
    font-weight: 500;
    transition: color var(--transition);
}

.section-header a:hover {
    color: var(--brand-green);
}

/* Cards grid */
.articles-grid {
    display: grid;
    gap: 2.5rem;
    grid-template-columns: 1fr;
}

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

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

/* Article Card */
.article-card {
    display: flex;
    flex-direction: column;
}

.card-image-wrap {
    aspect-ratio: 16 / 9;
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
    overflow: hidden;
}

.card-image-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.article-card:hover .card-image-wrap img {
    transform: scale(1.05);
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    font-size: 0.75rem;
    color: var(--gray-500);
}

.card-category {
    font-weight: 600;
    color: var(--brand-green);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 0.75rem;
    transition: color var(--transition);
}

.article-card:hover .card-title {
    color: var(--brand-blue);
}

.card-link {
    font-size: 0.875rem;
    color: var(--brand-blue);
    font-weight: 500;
    transition: text-decoration var(--transition);
    margin-top: auto;
}

.card-link:hover {
    text-decoration: underline;
}

/* ---------- Educational / FAQ Section ---------- */
.section-edu {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 3rem 2rem;
    margin-bottom: 5rem;
}

@media (min-width: 768px) {
    .section-edu {
        padding: 4rem;
    }
}

.edu-inner {
    max-width: 48rem;
    margin-inline: auto;
}

.edu-label {
    display: block;
    text-align: center;
    color: var(--brand-green);
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
}

.edu-title {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    text-align: center;
    margin-bottom: 2.5rem;
    line-height: 1.3;
}

.edu-blocks {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    color: var(--gray-600);
    line-height: 1.8;
}

.edu-block h4 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--brand-dark);
    margin-bottom: 0.5rem;
}

/* ---------- Newsletter Section ---------- */
.section-newsletter {
    max-width: 56rem;
    margin-inline: auto;
    background: var(--brand-dark);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    text-align: center;
    color: var(--white);
    margin-bottom: 2rem;
}

@media (min-width: 768px) {
    .section-newsletter {
        padding: 4rem;
    }
}

.newsletter-title {
    font-size: 1.875rem;
    margin-bottom: 1rem;
}

.newsletter-desc {
    color: var(--gray-400);
    margin-bottom: 2rem;
    max-width: 32rem;
    margin-inline: auto;
    margin-bottom: 2rem;
}

.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 28rem;
    margin-inline: auto;
}

@media (min-width: 480px) {
    .newsletter-form {
        flex-direction: row;
    }
}

.newsletter-form input {
    flex: 1;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--white);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    outline: none;
    transition: box-shadow var(--transition);
}

.newsletter-form input::placeholder {
    color: var(--gray-500);
}

.newsletter-form input:focus {
    box-shadow: 0 0 0 2px rgba(5, 150, 105, 0.5);
}

.newsletter-form button {
    padding: 0.75rem 2rem;
    background: var(--brand-green);
    color: var(--white);
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 0.95rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    white-space: nowrap;
}

.newsletter-form button:hover {
    background: #047857;
    transform: translateY(-1px);
}

.newsletter-privacy {
    margin-top: 1rem;
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* ---------- Footer ---------- */
.site-footer {
    background: var(--gray-100);
    border-top: 1px solid var(--gray-200);
    margin-top: 5rem;
    padding-top: 4rem;
    padding-bottom: 3rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

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

.footer-brand p {
    color: var(--gray-500);
    font-size: 0.875rem;
    max-width: 22rem;
    line-height: 1.7;
    margin-top: 1.5rem;
}

.footer-col h5 {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--brand-dark);
    margin-bottom: 1.5rem;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-col ul a {
    font-size: 0.875rem;
    color: var(--gray-500);
    transition: color var(--transition);
}

.footer-col ul a:hover {
    color: var(--brand-green);
}

.footer-bottom {
    border-top: 1px solid var(--gray-200);
    padding-top: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer-copy {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    color: var(--gray-400);
    transition: color var(--transition);
}

.social-links a:hover {
    color: var(--brand-dark);
}

.social-links svg {
    width: 1.25rem;
    height: 1.25rem;
    fill: currentColor;
}