/* ============================================================
   Tesler Lab — Sistema de diseño del sitio público
   Extraído del home (jul 2026). Lo usan todas las páginas
   interiores; el home mantiene su CSS inline propio.
   Tipografía: Instrument Sans. Fondo claro dominante, verde de
   marca como acento, una sola banda oscura por página.
   ============================================================ */

:root {
    --paper: #FAFAF8;
    --white: #FFFFFF;
    --ink: #06141B;
    --ink-2: #11212D;
    --ink-soft: #3E4C55;
    --green: #059669;
    --green-bright: #10B981;
    --green-deep: #047857;
    --wire: #B9C4CC;
    --wire-soft: #DFE5E9;
    --line: #E7E9E5;
    --radius: 14px;
    --radius-sm: 8px;
    --shadow-card: 0 1px 2px rgba(6, 20, 27, 0.05), 0 12px 32px rgba(6, 20, 27, 0.07);
    --wrap: 1120px;
}

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

html { scroll-behavior: smooth; }

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

body {
    font-family: "Instrument Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
    background: var(--paper);
    color: var(--ink);
    font-size: 1rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

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

a { color: inherit; }

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

::selection { background: rgba(16, 185, 129, 0.25); }

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

/* ============ Navegación ============ */

.salto {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--ink);
    color: #FFFFFF;
    padding: 10px 18px;
    border-radius: 0 0 8px 0;
    z-index: 200;
}

.salto:focus-visible { left: 0; }

.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
}

.nav-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 24px;
    max-width: var(--wrap);
    margin: 0 auto;
}

.nav-logo img { height: 28px; width: auto; }

.nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: none;
    border: 1.5px solid var(--line);
    border-radius: 8px;
    cursor: pointer;
    color: var(--ink);
}

.nav-links {
    display: none;
    align-items: center;
    gap: 28px;
    list-style: none;
}

.nav-links a:not(.boton-nav) {
    text-decoration: none;
    font-size: 0.96rem;
    font-weight: 500;
    color: var(--ink-soft);
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s ease, color 0.2s ease;
}

.nav-links a:not(.boton-nav):hover {
    color: var(--green-deep);
    border-bottom-color: var(--green-bright);
}

.boton-nav {
    display: inline-block;
    background: var(--green-deep);
    color: #FFFFFF;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    padding: 10px 22px;
    border-radius: 8px;
    transition: background-color 0.18s ease;
}

.boton-nav:hover { background: var(--green); }

.nav.abierta .nav-links {
    display: flex;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 6px 0 18px;
}

.nav.abierta .nav-links li { width: 100%; }

.nav.abierta .nav-links a:not(.boton-nav) {
    display: block;
    padding: 10px 4px;
}

.nav.abierta .boton-nav { margin-top: 8px; }

@media (min-width: 821px) {
    .nav-toggle { display: none; }
    .nav-links { display: flex; }
}

/* ============ Botones y enlaces ============ */

.btn {
    display: inline-block;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 12px 26px;
    border-radius: 999px;
    border: 0;
    cursor: pointer;
    font-family: inherit;
    transition: transform 0.15s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.btn-verde {
    background: var(--green-bright);
    color: var(--ink);
    box-shadow: 0 2px 10px rgba(5, 150, 105, 0.25);
}

.btn-verde:hover {
    background: #34D399;
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(5, 150, 105, 0.3);
}

.btn-tinta {
    background: transparent;
    color: var(--ink);
    border: 1.5px solid var(--ink-2);
}

.btn-tinta:hover {
    background: var(--ink);
    color: var(--paper);
}

.enlace-verde {
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--green-deep);
    padding-bottom: 3px;
    background-image: linear-gradient(var(--green-bright), var(--green-bright));
    background-repeat: no-repeat;
    background-size: 100% 2px;
    background-position: 0 100%;
    transition: background-size 0.25s ease, color 0.2s ease;
}

.enlace-verde:hover {
    background-size: 100% 6px;
    color: var(--ink);
}

/* ============ Secciones y cabeceras ============ */

section { padding: 88px 0; }

.kicker {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--green-deep);
}

.cabecera {
    max-width: 620px;
    margin-bottom: 52px;
}

.cabecera h2 {
    font-size: clamp(1.7rem, 3.4vw, 2.4rem);
    line-height: 1.15;
    font-weight: 700;
    letter-spacing: -0.015em;
    margin-top: 14px;
}

.cabecera p {
    margin-top: 16px;
    color: var(--ink-soft);
}

.banda-blanca {
    background: var(--white);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

/* ============ Reveal al hacer scroll ============ */

.js .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .reveal.visto {
    opacity: 1;
    transform: none;
}

@media (prefers-reduced-motion: reduce) {
    .js .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ============ Hero de página interior ============ */

.pagina-hero {
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--line);
    padding: 0;
}

.pagina-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--wire-soft) 1px, transparent 1px),
        linear-gradient(90deg, var(--wire-soft) 1px, transparent 1px);
    background-size: 56px 56px;
    opacity: 0.35;
    mask-image: radial-gradient(ellipse 90% 80% at 70% 40%, black 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse 90% 80% at 70% 40%, black 30%, transparent 75%);
    pointer-events: none;
}

.pagina-hero-inner {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
    padding-top: 72px;
    padding-bottom: 80px;
}

.pagina-hero .kicker { margin-bottom: 18px; }

.pagina-hero h1 {
    font-size: clamp(2rem, 4.6vw, 3.2rem);
    line-height: 1.08;
    font-weight: 700;
    letter-spacing: -0.02em;
    max-width: 20ch;
}

.pagina-hero .bajada {
    margin-top: 20px;
    font-size: 1.1rem;
    color: var(--ink-soft);
    max-width: 52ch;
}

.pagina-hero .acciones {
    margin-top: 32px;
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.placa {
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-card);
    background: var(--white);
}

.placa img { width: 100%; height: auto; }

@media (max-width: 900px) {
    .pagina-hero-inner {
        grid-template-columns: 1fr;
        padding-top: 56px;
        padding-bottom: 60px;
    }
    .pagina-hero .placa { max-width: 520px; }
}

/* ============ Tarjetas ============ */

.tarjetas {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

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

.tarjeta {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px 26px;
    transition: box-shadow 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
}

.tarjeta:hover {
    box-shadow: var(--shadow-card);
    transform: translateY(-3px);
    border-color: var(--wire);
}

.tarjeta svg {
    width: 32px;
    height: 32px;
    color: var(--green);
    margin-bottom: 16px;
}

.tarjeta .marca {
    display: block;
    width: 16px;
    height: 16px;
    border-radius: 5px;
    background: rgba(5, 150, 105, 0.22);
    margin-bottom: 14px;
}

.tarjeta h3, .tarjeta h4 {
    font-size: 1.12rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.tarjeta p {
    margin-top: 9px;
    font-size: 0.95rem;
    color: var(--ink-soft);
}

a.tarjeta { display: block; text-decoration: none; }

/* ============ Dúo (texto + media) ============ */

.duo {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 56px;
    align-items: center;
}

.duo.invertido { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); }

@media (max-width: 900px) {
    .duo, .duo.invertido { grid-template-columns: 1fr; gap: 32px; }
}

.duo h2 {
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    line-height: 1.18;
    font-weight: 700;
    letter-spacing: -0.015em;
    margin-bottom: 18px;
}

.duo p + p { margin-top: 14px; }

.duo p { color: var(--ink-soft); }

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

/* ============ Ítems con punto verde ============ */

.puntos {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px 28px;
}

@media (max-width: 640px) {
    .puntos { grid-template-columns: 1fr; }
}

.puntos li {
    position: relative;
    padding-left: 20px;
}

.puntos li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green-bright);
}

.puntos strong { display: block; }

.puntos p {
    font-size: 0.92rem;
    color: var(--ink-soft);
    margin-top: 3px;
}

/* ============ Pasos del proceso (banda oscura única) ============ */

.pasos-banda {
    background: var(--ink);
    color: var(--paper);
}

.pasos-banda .kicker { color: var(--green-bright); }

.pasos-banda .cabecera h2 { color: var(--paper); }

.pasos-banda .cabecera p { color: #B9C4CC; }

.pasos {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

@media (max-width: 980px) {
    .pasos { grid-template-columns: repeat(2, 1fr); }
}

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

.paso {
    background: var(--ink-2);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius);
    padding: 26px 24px;
}

.paso .numero {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: rgba(16, 185, 129, 0.16);
    color: var(--green-bright);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.paso h3, .paso h4 {
    font-size: 1.08rem;
    font-weight: 700;
    color: var(--paper);
}

.paso p {
    margin-top: 9px;
    font-size: 0.92rem;
    color: #B9C4CC;
}

/* ============ Preguntas frecuentes (details nativo) ============ */

.faq {
    max-width: 760px;
    margin: 0 auto;
}

.faq details {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 0;
}

.faq details + details { margin-top: 12px; }

.faq summary {
    list-style: none;
    cursor: pointer;
    padding: 18px 52px 18px 20px;
    font-weight: 600;
    position: relative;
}

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

.faq summary::before,
.faq summary::after {
    content: "";
    position: absolute;
    right: 20px;
    top: 50%;
    width: 14px;
    height: 2px;
    border-radius: 2px;
    background: var(--green-deep);
    transform: translateY(-50%);
    transition: transform 0.2s ease;
}

.faq summary::after { transform: translateY(-50%) rotate(90deg); }

.faq details[open] summary::after { transform: translateY(-50%) rotate(0deg); }

.faq details p,
.faq .respuesta {
    padding: 0 20px 20px;
    color: var(--ink-soft);
    font-size: 0.96rem;
}

/* ============ Formulario de contacto ============ */

.form-tarjeta {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    padding: 36px 34px;
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 40px;
    align-items: center;
}

@media (max-width: 900px) {
    .form-tarjeta { grid-template-columns: 1fr; padding: 26px 22px; }
    .form-tarjeta .form-ilustracion { display: none; }
}

.form-fila {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 640px) {
    .form-fila { grid-template-columns: 1fr; }
}

.form-group { margin-bottom: 16px; }

.form-group label {
    display: block;
    font-size: 0.88rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    font-family: inherit;
    font-size: 0.96rem;
    color: var(--ink);
    background: var(--paper);
    border: 1.5px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 11px 14px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--green);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.14);
}

textarea.form-control { resize: vertical; min-height: 110px; }

.form-error {
    color: #B42318;
    font-size: 0.82rem;
    margin-top: 5px;
    min-height: 0;
}

.messages { margin-bottom: 14px; }

.messages .alert,
.messages > div {
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 0.94rem;
}

.messages .alert-success { background: #E7F5EF; color: var(--green-deep); border: 1px solid rgba(5, 150, 105, 0.3); }

.messages .alert-danger { background: #FDEBE8; color: #B42318; border: 1px solid rgba(180, 35, 24, 0.25); }

.nota-form {
    font-size: 0.85rem;
    color: var(--ink-soft);
    margin-top: 10px;
}

/* ============ Cierre de contacto (banda oscura) ============ */

.cierre {
    background: var(--ink);
    color: var(--paper);
    padding: 100px 0;
}

.cierre-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
}

@media (max-width: 820px) {
    .cierre-inner { grid-template-columns: 1fr; }
}

.cierre .kicker { color: var(--green-bright); }

.cierre h2 {
    margin-top: 14px;
    font-size: clamp(1.9rem, 4vw, 2.8rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.12;
}

.cierre .bajada {
    margin-top: 18px;
    color: #B9C4CC;
    max-width: 48ch;
}

.cierre-datos {
    background: var(--ink-2);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius);
    padding: 34px 32px;
}

.cierre-datos img {
    height: 26px;
    width: auto;
    margin-bottom: 22px;
}

.mail-grande {
    display: inline-block;
    font-size: clamp(1.05rem, 2.4vw, 1.35rem);
    font-weight: 700;
    color: var(--green-bright);
    text-decoration: none;
    padding-bottom: 4px;
    background-image: linear-gradient(var(--green-bright), var(--green-bright));
    background-repeat: no-repeat;
    background-size: 0 2px;
    background-position: 0 100%;
    transition: background-size 0.25s ease;
    word-break: break-all;
}

.mail-grande:hover { background-size: 100% 2px; }

.cierre-datos p {
    margin-top: 14px;
    font-size: 0.9rem;
    color: #8FA0AA;
}

/* ============ Lista de obras (proyectos) ============ */

.obras {
    list-style: none;
    border-top: 1px solid var(--line);
}

.obras li { border-bottom: 1px solid var(--line); }

.obra {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 8px 32px;
    padding: 30px 20px;
    text-decoration: none;
    overflow: hidden;
}

.obra::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--tinta, #EDF7F2);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (prefers-reduced-motion: reduce) {
    .obra::before { transition: none; }
}

.obra > * { position: relative; }

.obra:hover::before,
.obra:focus-visible::before { transform: scaleX(1); }

.obra-texto h2,
.obra-texto h3 {
    font-size: clamp(1.3rem, 2.6vw, 1.9rem);
    font-weight: 700;
    letter-spacing: -0.015em;
    line-height: 1.2;
    transition: transform 0.3s ease;
}

.obra:hover .obra-texto h2,
.obra:hover .obra-texto h3 { transform: translateX(10px); }

@media (prefers-reduced-motion: reduce) {
    .obra:hover .obra-texto h2,
    .obra:hover .obra-texto h3 { transform: none; }
}

.obra-texto p {
    margin-top: 6px;
    font-size: 0.92rem;
    color: var(--ink-soft);
    max-width: 58ch;
}

.obra-tag {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--green-deep);
    white-space: nowrap;
    justify-self: end;
}

@media (max-width: 640px) {
    .obra { grid-template-columns: 1fr; padding: 24px 14px; }
    .obra-tag { justify-self: start; order: -1; }
}

/* ============ Ficha de caso (proyecto) ============ */

.caso-meta {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px 28px;
}

@media (max-width: 720px) {
    .caso-meta { grid-template-columns: 1fr; gap: 18px; }
}

.caso-meta h3 {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-soft);
    margin-bottom: 6px;
}

.caso-meta p { font-size: 0.96rem; }

/* ============ Artículo (blog) ============ */

.articulo {
    max-width: 720px;
    margin: 0 auto;
}

.articulo-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    align-items: center;
    font-size: 0.88rem;
    color: var(--ink-soft);
    margin-bottom: 28px;
}

.articulo h2 {
    font-size: 1.55rem;
    font-weight: 700;
    letter-spacing: -0.015em;
    line-height: 1.2;
    margin: 44px 0 16px;
}

.articulo h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 34px 0 12px;
}

.articulo p { margin: 0 0 16px; color: var(--ink-soft); }

.articulo p strong, .articulo li strong { color: var(--ink); }

.articulo ul, .articulo ol { margin: 0 0 16px 22px; color: var(--ink-soft); }

.articulo li + li { margin-top: 8px; }

.articulo img {
    border-radius: var(--radius);
    border: 1px solid var(--line);
    margin: 28px 0;
}

.articulo blockquote {
    border-left: 3px solid var(--green-bright);
    padding: 4px 0 4px 20px;
    margin: 24px 0;
    color: var(--ink);
    font-weight: 500;
}

/* ============ Footer ============ */

.footer {
    background: var(--paper);
    padding: 64px 0 36px;
}

.footer-cols {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
}

@media (max-width: 720px) {
    .footer-cols { grid-template-columns: 1fr; gap: 32px; }
}

.footer-cols img { height: 26px; width: auto; }

.footer-cols .tag {
    margin-top: 14px;
    font-size: 0.92rem;
    color: var(--ink-soft);
}

.footer h4 {
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-soft);
    margin-bottom: 16px;
}

.footer ul { list-style: none; }

.footer ul li + li { margin-top: 10px; }

.footer ul a {
    text-decoration: none;
    font-size: 0.95rem;
    color: var(--ink-2);
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.footer ul a:hover { border-bottom-color: var(--green-bright); }

.footer-mail {
    margin-top: 18px;
    font-size: 0.95rem;
}

.footer-mail a {
    color: var(--green-deep);
    text-decoration: none;
    font-weight: 600;
}

.footer-mail a:hover { text-decoration: underline; }

.footer-base {
    margin-top: 52px;
    padding-top: 24px;
    border-top: 1px solid var(--line);
    font-size: 0.85rem;
    color: var(--ink-soft);
    display: flex;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

/* ============================================================
   Casos filtrables con preview (proyectos)
   ============================================================ */

.filtro-casos {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.chip-filtro {
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--ink-soft);
    background: var(--white);
    border: 1.5px solid var(--line);
    border-radius: 999px;
    padding: 9px 20px;
    cursor: pointer;
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, transform 0.12s ease;
}

.chip-filtro:hover { border-color: var(--wire); color: var(--ink); }

.chip-filtro:active { transform: scale(0.97); }

.chip-filtro[aria-pressed="true"] {
    color: var(--white);
    background: var(--green-deep);
    border-color: var(--green-deep);
}

.filtro-conteo {
    font-size: 0.85rem;
    color: var(--ink-soft);
    margin-bottom: 34px;
    min-height: 1.2em;
}

.casos {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 26px;
}

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

.caso {
    display: flex;
    flex-direction: column;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    transition: box-shadow 0.28s ease, transform 0.28s ease, border-color 0.28s ease;
}

.caso:hover {
    box-shadow: var(--shadow-card);
    transform: translateY(-4px);
    border-color: var(--wire);
}

.caso[hidden] { display: none; }

.caso-preview {
    display: block;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.caso-preview img,
.caso-preview svg {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    transition: transform 0.45s ease;
}

.caso:hover .caso-preview img,
.caso:hover .caso-preview svg { transform: scale(1.035); }

.caso-cuerpo {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 24px 24px 26px;
}

.caso-tag {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--green-deep);
}

.caso-cuerpo h3 {
    font-size: 1.22rem;
    font-weight: 700;
    letter-spacing: -0.015em;
    line-height: 1.2;
    margin-top: 10px;
}

.caso-cuerpo h3 a {
    text-decoration: none;
    background-image: linear-gradient(var(--green-bright), var(--green-bright));
    background-repeat: no-repeat;
    background-size: 0 2px;
    background-position: 0 100%;
    transition: background-size 0.25s ease;
}

.caso:hover .caso-cuerpo h3 a,
.caso-cuerpo h3 a:focus-visible { background-size: 100% 2px; }

.caso-desc {
    margin-top: 9px;
    font-size: 0.95rem;
    color: var(--ink-soft);
}

.caso-aportes {
    list-style: none;
    margin-top: 16px;
    display: grid;
    gap: 9px;
}

.caso-aportes li {
    position: relative;
    padding-left: 24px;
    font-size: 0.9rem;
    color: var(--ink-2);
}

.caso-aportes li::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 0.26em;
    width: 11px;
    height: 6px;
    border-left: 2px solid var(--green);
    border-bottom: 2px solid var(--green);
    transform: rotate(-45deg);
}

.caso-cta { margin-top: auto; padding-top: 20px; }

@media (prefers-reduced-motion: reduce) {
    .caso,
    .caso:hover,
    .caso-preview img,
    .caso:hover .caso-preview img,
    .chip-filtro:active { transition: none; transform: none; }
}

/* ============================================================
   Íconos en los pasos del proceso (#8)
   ============================================================ */

.paso-icono {
    display: block;
    width: 30px;
    height: 30px;
    color: var(--green-bright);
    margin-bottom: 16px;
}

.paso-icono svg { width: 100%; height: 100%; display: block; }

.paso .numero { margin-bottom: 12px; }

/* ============================================================
   Micro-interacciones y pulido (#9)
   ============================================================ */

.btn:active { transform: translateY(0) scale(0.98); }

.btn-verde:focus-visible,
.boton-nav:focus-visible { outline-offset: 4px; }

/* Spinner del botón de envío del form */
.btn-spinner {
    display: inline-block;
    width: 15px;
    height: 15px;
    border: 2px solid rgba(6, 20, 27, 0.25);
    border-top-color: var(--ink);
    border-radius: 50%;
    vertical-align: -2px;
    animation: girar 0.7s linear infinite;
}

@keyframes girar { to { transform: rotate(360deg); } }

/* Estados de validación del form */
.form-control.is-invalid {
    border-color: #D6483B;
    background: #FDF6F5;
}

.form-control.is-valid { border-color: rgba(5, 150, 105, 0.5); }

.form-error {
    display: none;
}

/* Cierre del alert del form (reset del botón bootstrap heredado) */
.messages .alert { position: relative; padding-right: 40px; }

.messages .btn-close {
    position: absolute;
    top: 10px;
    right: 12px;
    width: 22px;
    height: 22px;
    border: 0;
    background: transparent;
    color: inherit;
    font-size: 0;
    cursor: pointer;
    opacity: 0.6;
}

.messages .btn-close::before {
    content: "×";
    font-size: 1.2rem;
    line-height: 1;
}

.messages .btn-close:hover { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
    .btn:active { transform: none; }
    .btn-spinner { animation: none; }
}

/* ============================================================
   Blog: grilla de notas filtrable + notas relacionadas (#3)
   ============================================================ */

.grilla-blog {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

@media (max-width: 900px) { .grilla-blog { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grilla-blog { grid-template-columns: 1fr; } }

.nota-card {
    display: flex;
    flex-direction: column;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px 24px 26px;
    text-decoration: none;
    transition: box-shadow 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
}

.nota-card:hover {
    box-shadow: var(--shadow-card);
    transform: translateY(-3px);
    border-color: var(--wire);
}

.nota-card[hidden] { display: none; }

.nota-card .n-cat {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--green-deep);
}

.nota-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1.25;
    margin-top: 10px;
    color: var(--ink);
}

.nota-card p {
    margin-top: 10px;
    font-size: 0.92rem;
    color: var(--ink-soft);
    flex: 1;
}

.nota-card .n-meta {
    margin-top: 16px;
    font-size: 0.82rem;
    color: var(--ink-soft);
}

.nota-card .n-leer {
    margin-top: 14px;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--green-deep);
}

.nota-card:hover .n-leer { color: var(--ink); }

/* Notas relacionadas al pie del artículo */
.relacionados {
    max-width: 720px;
    margin: 56px auto 0;
    padding-top: 34px;
    border-top: 1px solid var(--line);
}

.relacionados h2 {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 20px;
}

.relacionados-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

@media (max-width: 640px) { .relacionados-grid { grid-template-columns: 1fr; } }

.relacionado {
    display: block;
    text-decoration: none;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 16px 18px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.relacionado:hover {
    border-color: var(--wire);
    box-shadow: var(--shadow-card);
    transform: translateY(-2px);
}

.relacionado .r-cat {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--green-deep);
}

.relacionado h3 {
    font-size: 0.98rem;
    font-weight: 700;
    line-height: 1.25;
    margin-top: 6px;
    color: var(--ink);
}

@media (prefers-reduced-motion: reduce) {
    .nota-card, .nota-card:hover, .relacionado, .relacionado:hover { transition: none; transform: none; }
}