/* ============================================================
   12-Pillar Flip Card System
   Drop into assets/css/ and link AFTER style.css
   ============================================================ */

/* Override the default pillars-container grid when flip is active */
.pillars-flip-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
}

/* Outer wrapper — sets the 3D stage */
.pillar-flip-card {
    perspective: 1000px;
    height: 220px;
    cursor: pointer;
}

/* Inner wrapper — this is what flips */
.pillar-flip-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.65s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 16px;
}

/* Trigger flip on hover */
.pillar-flip-card:hover .pillar-flip-inner {
    transform: rotateY(180deg);
}

/* Shared face styles */
.pillar-flip-front,
.pillar-flip-back {
    position: absolute;
    inset: 0;
    border-radius: 16px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    padding: 1.4rem 1.5rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ---- FRONT FACE ---- */
.pillar-flip-front {
    background: var(--card-bg-soft);
    border: 1px solid var(--card-border);
    justify-content: flex-start;
    gap: 0.6rem;
    transition: border-color 0.3s;
}

.pillar-flip-card:hover .pillar-flip-front {
    border-color: rgba(236, 77, 158, 0.25);
}

.pillar-flip-front .pillar-num {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.pillar-flip-front-body h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin: 0 0 0.4rem 0;
    line-height: 1.3;
}

.pillar-flip-front-body p {
    font-size: 0.8rem;
    color: var(--gray);
    line-height: 1.5;
    margin: 0;
}

.pillar-hint {
    margin-top: auto;
    font-size: 0.72rem;
    color: var(--primary);
    opacity: 0.6;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: opacity 0.3s;
}

.pillar-flip-card:hover .pillar-hint {
    opacity: 1;
}

/* ---- BACK FACE ---- */
.pillar-flip-back {
    background: linear-gradient(135deg, rgba(236, 77, 158, 0.12) 0%, rgba(155, 89, 217, 0.12) 100%);
    border: 1px solid rgba(236, 77, 158, 0.3);
    transform: rotateY(180deg);
    justify-content: flex-start;
    gap: 0.5rem;
}

.pillar-back-num {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 0.08em;
    opacity: 0.7;
}

.pillar-flip-back h4 {
    font-size: 0.88rem;
    font-weight: 700;
    margin: 0 0 0.4rem 0;
    line-height: 1.3;
}

.pillar-flip-back ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.28rem;
}

.pillar-flip-back ul li {
    font-size: 0.78rem;
    color: var(--gray);
    line-height: 1.4;
    display: flex;
    align-items: baseline;
    gap: 0.35rem;
}

.pillar-back-tag {
    margin-top: auto;
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    background: rgba(236, 77, 158, 0.15);
    color: var(--primary);
    border: 1px solid rgba(236, 77, 158, 0.25);
    border-radius: 20px;
    padding: 0.2rem 0.65rem;
    align-self: flex-start;
}

/* Light-mode adjustments */
body.light-mode .pillar-flip-front {
    background: #ffffff;
    border-color: rgba(236, 77, 158, 0.14);
}

body.light-mode .pillar-flip-back {
    background: linear-gradient(135deg, rgba(236, 77, 158, 0.07) 0%, rgba(155, 89, 217, 0.07) 100%);
    border-color: rgba(236, 77, 158, 0.25);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .pillar-flip-inner {
        transition: none;
    }
}

/* Responsive */
@media (max-width: 900px) {
    .pillars-flip-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .pillar-flip-card {
        height: 240px;
    }
}

@media (max-width: 560px) {
    .pillars-flip-grid {
        grid-template-columns: 1fr;
    }
    .pillar-flip-card {
        height: auto;
        min-height: 180px;
    }
    .pillar-flip-inner {
        height: 210px;
    }
}