/* ============================================
   PORTFOLIO - SKILLS PAGE
   Module 6: categories, chips, core stack
   Loaded only on the skills page.
   ============================================ */

/* ----------------------------------------
   1. CORE STACK STRIP (floating icons)
   ---------------------------------------- */
.core-stack {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-5);
    margin-bottom: var(--space-8);
}

.core-stack-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    min-width: 96px;
    transition: color var(--transition-base);
}

.core-icon {
    width: 84px;
    height: 84px;
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.1rem;
    background: var(--bg-card);
    border: var(--border-width) solid var(--surface-border-strong);
    color: var(--f-color, var(--primary-light));
    box-shadow: var(--shadow-md);
    will-change: transform;
    transition: transform var(--transition-spring), border-color var(--transition-base),
                box-shadow var(--transition-base), background-color var(--transition-base);
}

.core-stack-item:hover .core-icon {
    transform: translateY(-6px) scale(1.06);
    border-color: var(--f-color, var(--primary));
    box-shadow: 0 14px 34px color-mix(in srgb, var(--f-color, var(--primary)) 35%, transparent);
    background: var(--bg-card-hover);
}

.core-stack-item span {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--text-muted);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
}

.core-stack-item:hover span {
    color: var(--f-color, var(--primary-light));
}

/* ----------------------------------------
   2. CATEGORY CARDS
   ---------------------------------------- */
.skill-cat-card {
    display: flex;
    flex-direction: column;
    position: relative;
}

.skill-cat-head {
    text-align: center;
    padding-bottom: var(--space-4);
    border-bottom: var(--border-width) dashed var(--surface-border);
    margin-bottom: var(--space-5);
}

.skill-cat-icon {
    width: 68px;
    height: 68px;
    margin: 0 auto var(--space-4);
    border-radius: var(--radius-lg);
    background: color-mix(in srgb, var(--cat-color) 18%, var(--bg-card));
    border: var(--border-width) solid color-mix(in srgb, var(--cat-color) 45%, transparent);
    color: var(--cat-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--fs-2xl);
    transition: transform var(--transition-spring), background-color var(--transition-base),
                color var(--transition-base);
}

.skill-cat-card:hover .skill-cat-icon {
    transform: translateY(-4px) rotate(-6deg) scale(1.08);
    background: var(--cat-color);
    color: #fff;
}

.skill-cat-head .card-title {
    margin-bottom: var(--space-2);
}

.skill-cat-head .card-text {
    margin-bottom: 0;
    font-size: var(--fs-sm);
}

/* Gradient border (tinted per category) */
.skill-cat-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, var(--cat-color), var(--secondary));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
            mask-composite: exclude;
    pointer-events: none;
    opacity: 0.35;
    transition: opacity var(--transition-base);
}

.skill-cat-card:hover::before {
    opacity: 1;
}

/* ---- Skill chips ---- */
.skill-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
}

.skill-chip {
    flex: 1 1 42%;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0.6rem 0.85rem;
    background: var(--bg-card);
    border: var(--border-width) solid var(--surface-border);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    transition: all var(--transition-base);
    cursor: default;
}

.skill-chip i:first-child {
    font-size: var(--fs-md);
    line-height: 1;
}

.skill-chip .chip-plus {
    margin-left: auto;
    font-size: var(--fs-xs);
    color: var(--cat-color);
    opacity: 0;
    transform: rotate(-90deg);
    transition: opacity var(--transition-base), transform var(--transition-spring);
}

.skill-chip:hover {
    transform: translateY(-3px);
    border-color: var(--cat-color);
    background: var(--bg-card-hover);
    color: var(--text-primary);
    box-shadow: 0 8px 24px color-mix(in srgb, var(--cat-color) 25%, transparent);
}

.skill-chip:hover .chip-plus {
    opacity: 1;
    transform: rotate(0deg);
}

/* ---- Card footer link ---- */
.skill-cat-foot {
    margin-top: auto;
    padding-top: var(--space-4);
    border-top: var(--border-width) dashed var(--surface-border);
}

.skill-cat-foot a {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    color: var(--cat-color);
    transition: gap var(--transition-fast), color var(--transition-fast);
}

.skill-cat-foot a:hover {
    gap: var(--space-3);
    color: var(--secondary);
}

.skill-cat-foot a i {
    transition: transform var(--transition-fast);
}

.skill-cat-foot a:hover i {
    transform: translateX(3px);
}

/* ----------------------------------------
   3. RESPONSIVE
   ---------------------------------------- */
@media (max-width: 767.98px) {
    .core-stack {
        gap: var(--space-4);
    }

    .core-icon {
        width: 70px;
        height: 70px;
        font-size: 1.75rem;
    }
}

@media (max-width: 575.98px) {
    .core-stack-item {
        min-width: 74px;
    }

    .core-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
        border-radius: 16px;
    }

    .skill-chip {
        flex: 1 1 100%;
    }
}

/* ----------------------------------------
   4. REDUCED MOTION
   ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    .core-icon,
    .skill-cat-icon {
        transition: none;
    }
}