/* ===================================================
   STM PRO CORE - Identidad visual (negro / rojo / blanco)
   Tokens de marca
=================================================== */
:root {
    --stm-ink: #121214;
    --stm-paper: #f6f5f3;
    --stm-white: #ffffff;
    --stm-signal: #c8102e;
    --stm-signal-dark: #8c0c20;
    --stm-steel: #55565c;
    --stm-radius: 4px;
}

/* ===================================================
   STM PRO CORE - Sistema de Tarjetas
=================================================== */

.stm-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.stm-card {
    position: relative;
    background: var(--stm-white);
    border: 1.5px solid var(--stm-ink);
    border-radius: var(--stm-radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: transform .18s ease, box-shadow .18s ease;
}

.stm-card:hover {
    transform: translate(-2px, -2px);
    box-shadow: 5px 5px 0 var(--stm-ink);
}

.stm-card-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 24px;
    font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.stm-card-body h3 {
    font-family: 'Archivo', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 800;
    font-size: 22px;
    margin: 0 0 15px;
    color: var(--stm-ink);
    line-height: 1.25;
    letter-spacing: -0.01em;
}

.stm-card-body h3 a {
    color: var(--stm-ink) !important;
    text-decoration: none;
}

.stm-card-body h3 a:hover {
    color: var(--stm-signal) !important;
}

.stm-meta {
    margin-bottom: 15px;
    color: var(--stm-steel);
    font-size: 14px;
}

.stm-meta p {
    margin: 5px 0;
}

.stm-meta a {
    color: var(--stm-signal) !important;
    font-weight: 600;
}

.stm-card-body > p {
    flex: 1;
    color: var(--stm-steel);
    line-height: 1.6;
    margin-bottom: 25px;
}

.stm-btn, .stm-boton {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 14px;
    background: var(--stm-accent, var(--stm-ink)) !important;
    color: var(--stm-white) !important;
    border: 1.5px solid var(--stm-accent, var(--stm-ink)) !important;
    border-radius: var(--stm-radius);
    text-decoration: none !important;
    font-weight: 700;
    font-family: 'IBM Plex Sans', sans-serif;
    transition: background .15s ease, color .15s ease;
    margin-top: auto;
    cursor: pointer;
    box-shadow: none;
}

.stm-btn:hover, .stm-boton:hover {
    background: var(--stm-white) !important;
    color: var(--stm-accent, var(--stm-ink)) !important;
    transform: none;
    box-shadow: none;
}

.stm-card a {
    text-decoration: none;
    color: inherit;
}

/* ===================================================
   BUSCADOR Y FILTROS
=================================================== */

.stm-buscador { margin: 40px 0; }
.stm-buscador__filtros { display: flex; gap: 15px; margin-bottom: 30px; flex-wrap: wrap; align-items: center; }
.stm-buscador__filtros input, .stm-buscador__filtros select {
    flex: 1;
    min-width: 220px;
    padding: 10px 15px;
    height: 48px;
    border: 1.5px solid var(--stm-ink);
    border-radius: var(--stm-radius);
    font-size: 16px;
    font-family: 'IBM Plex Sans', sans-serif;
    background: var(--stm-white);
    color: var(--stm-ink);
    transition: border-color .15s, box-shadow .15s;
}

.stm-buscador__filtros input:focus, .stm-buscador__filtros select:focus {
    outline: none;
    border-color: var(--stm-signal);
    box-shadow: 0 0 0 3px rgba(200, 16, 46, 0.15);
}

.stm-btn-reset {
    flex: 0 0 auto;
    padding: 10px 18px;
    height: 48px;
    border: 1.5px solid var(--stm-ink);
    border-radius: var(--stm-radius);
    background: var(--stm-white);
    color: var(--stm-ink);
    font-size: 14px;
    font-weight: 600;
    font-family: 'IBM Plex Sans', sans-serif;
    cursor: pointer;
    transition: background .15s ease, color .15s ease;
    white-space: nowrap;
}

.stm-btn-reset:hover {
    background: var(--stm-ink);
    color: var(--stm-white);
    border-color: var(--stm-ink);
}

/* ===================================================
   RESPONSIVE
=================================================== */
@media (max-width: 768px) {
    .stm-grid, .stm-buscador__resultados { grid-template-columns: 1fr !important; }
    .stm-btn, .stm-boton { width: 100% !important; }
    .stm-btn-reset { width: 100%; }
    .stm-card:hover { transform: none; box-shadow: none; }
}

/* Centrar el contenedor del buscador */
.stm-buscador {
    max-width: 1200px;
    margin: 40px auto !important;
    text-align: center;
}

/* Centrar los elementos del filtro */
.stm-buscador__filtros {
    justify-content: center;
}

/* Centrar el GRID cuando hay pocas tarjetas */
.stm-grid {
    justify-content: center;
}

/* ===================================================
   STM PRO CORE - Acentos por categoría
   Un acento por tipo de contenido, coherente en toda la
   web: rojo señal = averías, negro = repuestos,
   gris acero = descargas, rojo oscuro = vídeos.
=================================================== */

.stm-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 4px;
    background: var(--stm-accent, var(--stm-ink));
}

.stm-card--averia    { --stm-accent: var(--stm-signal); }
.stm-card--descarga  { --stm-accent: var(--stm-steel); }
.stm-card--repuesto  { --stm-accent: var(--stm-ink); }
.stm-card--video     { --stm-accent: var(--stm-signal-dark); }

.stm-card__thumbnail,
.stm-card-img {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-bottom: 1.5px solid var(--stm-ink);
}

.stm-card__thumbnail img,
.stm-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.stm-precio {
    font-size: 18px;
    font-weight: 800;
    color: var(--stm-signal);
    margin-top: 10px;
    font-family: 'IBM Plex Mono', 'Courier New', monospace;
}

.stm-card-body .stm-badge-categoria {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 2px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    background: var(--stm-accent, var(--stm-ink));
    border: none;
    color: var(--stm-white);
    margin-bottom: 10px;
    width: fit-content;
}