/* =========================================================
   Design tokens
   ========================================================= */
:root {
    --ink: #16233F;
    --ink-soft: #3B4A6B;
    --paper: #FAFAF9;
    --paper-alt: #F1EFE8;
    --linea: #DEDCD3;
    --sello: #B23A2E;
    --sello-soft: #E7C9C4;
    --verde: #2F6B4F;
    --mostaza: #C9971C;

    --font-display: 'Zilla Slab', Georgia, serif;
    --font-body: 'IBM Plex Sans', -apple-system, sans-serif;
    --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

    --radius: 10px;
    --wrap: 1180px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-body);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
    font-family: var(--font-display);
    color: var(--ink);
    line-height: 1.15;
    margin: 0 0 0.5em;
}

h1 {
    font-size: clamp(2rem, 4.2vw, 3.1rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(1.5rem, 2.6vw, 2rem);
    font-weight: 600;
}

h3 {
    font-size: 1.15rem;
    font-weight: 600;
}

p {
    margin: 0 0 1em;
    color: var(--ink-soft);
}

a {
    color: inherit;
}

.wrap {
    max-width: var(--wrap);
    margin: 0 auto;
    padding: 0 24px;
}

.wrap--narrow {
    max-width: 760px;
}

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

.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    background: var(--ink);
    color: var(--paper);
    padding: 10px 16px;
    z-index: 100;
    border-radius: 0 0 6px 0;
}

.skip-link:focus {
    left: 0;
}

:focus-visible {
    outline: 3px solid var(--mostaza);
    outline-offset: 2px;
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
    border-bottom: 1px solid var(--linea);
    background: var(--paper);
    position: sticky;
    top: 0;
    z-index: 20;
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    padding-bottom: 16px;
}

.logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.01em;
}

.logo__mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: var(--ink);
    color: var(--paper);
    border-radius: 6px;
    font-size: 1rem;
}

.logo__co {
    color: var(--sello);
}

.site-nav {
    display: flex;
    gap: 4px;
}

.site-nav a {
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 6px;
    color: var(--ink-soft);
}

.site-nav a:hover {
    background: var(--paper-alt);
    color: var(--ink);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--ink);
    display: block;
}

@media (max-width: 860px) {
    .nav-toggle {
        display: flex;
    }

    .site-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--paper);
        border-bottom: 1px solid var(--linea);
        flex-direction: column;
        padding: 8px 24px 16px;
        display: none;
    }

    .site-nav.is-open {
        display: flex;
    }
}

/* =========================================================
   Botones
   ========================================================= */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 13px 22px;
    border-radius: 8px;
    text-decoration: none;
    border: 1.5px solid transparent;
    transition: transform 0.15s ease, background 0.15s ease;
}

.btn--primary {
    background: var(--sello);
    color: #fff;
}

.btn--primary:hover {
    transform: translateY(-1px);
    background: #99301F;
}

.btn--ghost {
    border-color: var(--ink);
    color: var(--ink);
}

.btn--ghost:hover {
    background: var(--paper-alt);
}

/* =========================================================
   Hero + Sello de vigencia (elemento signature)
   ========================================================= */
.hero {
    padding: 64px 0 72px;
}

.hero__inner {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 56px;
    align-items: center;
}

@media (max-width: 900px) {
    .hero__inner {
        grid-template-columns: 1fr;
    }
}

.eyebrow {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.78rem;
    color: var(--verde);
    font-weight: 600;
    margin-bottom: 14px;
}

.ink-underline {
    text-decoration: underline;
    text-decoration-color: var(--sello-soft);
    text-decoration-thickness: 6px;
    text-underline-offset: 2px;
}

.hero__lead {
    font-size: 1.08rem;
    max-width: 46ch;
}

.hero__cta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.hero__stamp-wrap {
    display: flex;
    justify-content: center;
}

.stamp {
    --stamp-rotate: -3deg;
    position: relative;
    transform: rotate(var(--stamp-rotate));
    border: 3px double var(--sello);
    border-radius: 8px;
    padding: 26px 30px;
    max-width: 320px;
    background:
        repeating-linear-gradient(115deg, rgba(178, 58, 46, 0.05) 0 2px, transparent 2px 6px);
    color: var(--sello);
}

.stamp__title {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.78rem;
    font-weight: 600;
    margin: 0 0 2px;
    color: var(--sello);
}

.stamp__date {
    font-family: var(--font-mono);
    font-size: 1.35rem;
    font-weight: 600;
    margin: 0 0 14px;
    color: var(--sello);
}

.stamp__list {
    list-style: none;
    margin: 0 0 14px;
    padding: 12px 0 0;
    border-top: 1px dashed var(--sello-soft);
    font-family: var(--font-mono);
    font-size: 0.86rem;
    color: var(--ink);
}

.stamp__list li {
    margin-bottom: 6px;
}

.stamp__list strong {
    color: var(--ink);
}

.stamp__foot {
    font-size: 0.78rem;
    margin: 0;
    color: var(--sello);
    font-weight: 500;
}

/* =========================================================
   Grupos de calculadoras
   ========================================================= */
.calc-group {
    padding: 56px 0;
}

.calc-group--alt {
    background: var(--paper-alt);
}

.section-lead {
    max-width: 60ch;
    margin-bottom: 32px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.card-grid--single {
    grid-template-columns: minmax(0, 560px);
}

@media (max-width: 860px) {
    .card-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 560px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
}

.card {
    display: block;
    background: var(--paper);
    border: 1px solid var(--linea);
    border-radius: var(--radius);
    padding: 26px 24px;
    text-decoration: none;
    transition: border-color 0.15s ease, transform 0.15s ease;
    position: relative;
}

.card:hover {
    border-color: var(--ink);
    transform: translateY(-2px);
}

.card--featured {
    grid-column: span 2;
    background: var(--ink);
    border-color: var(--ink);
}

.card--featured h3,
.card--featured p,
.card--featured .card__cta {
    color: var(--paper);
}

.card--featured p {
    color: #C7CEDE;
}

@media (max-width: 860px) {
    .card--featured {
        grid-column: span 2;
    }
}

@media (max-width: 560px) {
    .card--featured {
        grid-column: span 1;
    }
}

.card__tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--sello);
    background: var(--sello-soft);
    padding: 3px 9px;
    border-radius: 20px;
    margin-bottom: 10px;
    font-weight: 600;
}

.card--featured .card__tag {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

.card__cta {
    display: inline-block;
    margin-top: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--sello);
}

/* =========================================================
   Confianza
   ========================================================= */
.trust__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

@media (max-width: 860px) {
    .trust__list {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 560px) {
    .trust__list {
        grid-template-columns: 1fr;
    }
}

.trust__list h3 {
    font-size: 1rem;
}

.trust__list p {
    font-size: 0.92rem;
}

/* =========================================================
   FAQ
   ========================================================= */
.faq {
    padding: 56px 0 72px;
}

.faq__item {
    border-bottom: 1px solid var(--linea);
    padding: 18px 0;
}

.faq__item summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 1.02rem;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq__item summary::-webkit-details-marker {
    display: none;
}

.faq__item summary::after {
    content: '+';
    font-family: var(--font-mono);
    font-size: 1.3rem;
    color: var(--sello);
    margin-left: 12px;
}

.faq__item[open] summary::after {
    content: '−';
}

.faq__item p {
    margin-top: 12px;
    font-size: 0.96rem;
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
    border-top: 1px solid var(--linea);
    background: var(--paper-alt);
    padding: 40px 0;
}

.site-footer__inner {
    display: flex;
    justify-content: space-between;
    gap: 32px;
    flex-wrap: wrap;
}

.site-footer__brand {
    font-family: var(--font-display);
    font-weight: 700;
    margin-bottom: 6px;
}

.site-footer__disclaimer {
    font-size: 0.85rem;
    max-width: 40ch;
}

.site-footer nav {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.site-footer nav a {
    text-decoration: none;
    font-size: 0.9rem;
    color: var(--ink-soft);
}

.site-footer nav a:hover {
    color: var(--sello);
}

.site-footer__year {
    font-size: 0.85rem;
    color: var(--ink-soft);
}