/* ════════════════════════════════════════
   expertise.css
════════════════════════════════════════ */

:root {
    --red:          #9E001F;
    --dark:         #0f1117;
    --white:        #ffffff;
    --light-bg:     #f5f5f5;
    --font-heading: 'JetBrains Mono', monospace;
    --font-btn:     'Oswald', sans-serif;
}

/* ════════════════════════════════════════
   PAGE HERO
════════════════════════════════════════ */
.expertise-hero {
    background: #fff;
    border-top: 1px solid var(--red);
    padding: 3.5rem 0 3rem;
}

.expertise-hero-inner {
    display: flex;
    gap: 1.6rem;
    align-items: flex-start;
}

.expertise-hero-bar {
    flex-shrink: 0;
    width: 5px;
    background: var(--red);
    border-radius: 2px;
    align-self: stretch;
    min-height: 100%;
}

.expertise-hero-title {
    font-family: var(--font-heading);
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 900;
    color: var(--dark);
    margin: 0 0 1rem;
    line-height: 1.05;
}

.expertise-hero-desc {
    font-family: var(--font-heading);
    font-size: .84rem;
    color: #444;
    line-height: 1.9;
    margin: 0;
    max-width: 760px;
}

/* ════════════════════════════════════════
   ACCORDION SECTION
════════════════════════════════════════ */
.expertise-accordion-section {
    background: #fff;
    padding: 0 0 5rem;
}

.expertise-accordion {
    display: flex;
    flex-direction: column;
}

/* Item wrapper */
.accordion-item-wrap {
    border-bottom: 1px solid #e4e4e4;
}
.accordion-item-wrap:first-child {
    border-top: 1px solid #e4e4e4;
}

/* Trigger button */
.accordion-trigger {
    width: 100%;
    background: none;
    border: none;
    padding: 1.55rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    gap: 1rem;
    text-align: left;
}

.accordion-trigger-title {
    font-family: var(--font-heading);
    font-size: clamp(.88rem, 1.5vw, 1.02rem);
    font-weight: 800;
    color: var(--dark);
    letter-spacing: .03em;
    line-height: 1.2;
    transition: color .2s;
}

/* Red underline decoration */
.accordion-trigger-title::after {
    content: '';
    display: block;
    width: 36px;
    height: 3px;
    background: var(--red);
    margin-top: .5rem;
    border-radius: 2px;
    transition: width .3s;
}

.accordion-trigger:hover .accordion-trigger-title,
.accordion-trigger.is-open .accordion-trigger-title {
    color: var(--red);
}
.accordion-trigger.is-open .accordion-trigger-title::after,
.accordion-trigger:hover   .accordion-trigger-title::after {
    width: 52px;
}

/* Chevron */
.accordion-trigger-icon {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #aaa;
    font-size: 1rem;
    transition: transform .3s, color .2s;
}
.accordion-trigger.is-open .accordion-trigger-icon {
    transform: rotate(180deg);
    color: var(--red);
}
.accordion-trigger:hover .accordion-trigger-icon {
    color: var(--red);
}

/* Panel */
.accordion-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height .45s cubic-bezier(.4,0,.2,1);
}
.accordion-panel.is-open {
    max-height: 800px;
}

.accordion-panel-inner {
    padding: 0 0 2.2rem;
}

/* Intro line */
.accordion-intro {
    font-family: var(--font-heading);
    font-size: .82rem;
    color: #555;
    line-height: 1.8;
    margin-bottom: 1.2rem;
}

/* ── Cards grid ── */
.accordion-cards {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
}

.exp-card {
    flex: 1 1 140px;
    min-width: 130px;
    max-width: 200px;
    border: 1px solid #e0e0e0;
    border-radius: 10px;
    padding: 1.2rem 1rem 1.4rem;
    display: flex;
    flex-direction: column;
    gap: .55rem;
    background: #fff;
    transition: border-color .2s, box-shadow .2s, transform .2s;
}

.exp-card:hover {
    border-color: var(--red);
    box-shadow: 0 6px 20px rgba(158,0,31,.08);
    transform: translateY(-2px);
}

.exp-card-num {
    font-family: var(--font-heading);
    font-size: .7rem;
    font-weight: 700;
    color: var(--red);
    letter-spacing: .06em;
}

.exp-card-label {
    font-family: var(--font-heading);
    font-size: .78rem;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.45;
}

/* ════════════════════════════════════════
   ABOUT SUB-NAV
════════════════════════════════════════ */
.about-subnav {
    display: flex;
    justify-content: center;
    align-items: center;
    border-top: 1px solid #e0e0e0;
    background: #fff;
}

.subnav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .35rem;
    padding: 1.3rem 2.5rem;
    font-family: var(--font-heading);
    font-size: .65rem;
    font-weight: 700;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: #999;
    text-decoration: none;
    border-bottom: 3px solid transparent;
    transition: color .2s, border-color .2s;
}
.subnav-item i         { font-size: 1.2rem; }
.subnav-item:hover     { color: var(--red); border-bottom-color: var(--red); }
.subnav-item--active   { color: var(--red); border-bottom-color: var(--red); }

/* ════════════════════════════════════════
   RESPONSIVE
════════════════════════════════════════ */
@media (max-width: 768px) {
    .expertise-hero-bar { display: none; }
    .accordion-trigger  { padding: 1.2rem 0; }
    .accordion-cards    { gap: .5rem; }
    .exp-card           { flex: 1 1 calc(50% - .5rem); max-width: none; }
    .subnav-item        { padding: 1rem 1rem; font-size: .6rem; }
}

@media (max-width: 480px) {
    .exp-card { flex: 1 1 100%; }
}