/* ============================================================
   Re:Beauty Studio — About Page (Business / shadcn-inspired)
   Neutral palette · monochrome · subtle borders · mobile-first
   ============================================================ */

.main-content-about {
    padding: 0 !important;
    max-width: none !important;
}

.ab {
    /* --- Design tokens (shadcn neutrals) --- */
    --ab-bg:           hsl(0 0% 100%);
    --ab-fg:           hsl(240 10% 3.9%);
    --ab-card:         hsl(0 0% 100%);
    --ab-muted:        hsl(240 4.8% 95.9%);
    --ab-muted-fg:     hsl(240 3.8% 46.1%);
    --ab-border:       hsl(240 5.9% 90%);
    --ab-border-strong:hsl(240 5% 84.9%);
    --ab-primary:      hsl(240 5.9% 10%);
    --ab-primary-fg:   hsl(0 0% 98%);
    --ab-accent:       hsl(240 4.8% 95.9%);
    --ab-accent-fg:    hsl(240 5.9% 10%);
    --ab-ring:         hsl(240 5.9% 10%);
    --ab-radius-sm:    0.375rem;
    --ab-radius:       0.625rem;
    --ab-radius-lg:    0.875rem;
    --ab-radius-xl:    1.25rem;

    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Pretendard', 'Noto Sans KR', 'Noto Sans JP', 'Segoe UI', sans-serif;
    color: var(--ab-fg);
    background: var(--ab-bg);
    line-height: 1.6;
    word-break: normal;
    overflow-wrap: anywhere;
    -webkit-font-smoothing: antialiased;
}

.ab *,
.ab *::before,
.ab *::after { box-sizing: border-box; min-width: 0; }

.ab-h2, .ab-h3, .ab-h4,
.ab-hero-title, .ab-hero-subtitle,
.ab-lead, .ab-muted, .ab-stat-label,
.ab-badge, .ab-eyebrow, .ab-chip,
.ab-faq-q, .ab-faq-a,
.ab-meta-item, .ab-how-note,
.ab-mode-procs li, .ab-mode-prompts span {
    overflow-wrap: anywhere;
    word-break: normal;
    hyphens: auto;
}

.ab-container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================================
   Typography
   ============================================================ */
.ab-h2 {
    font-size: clamp(1.75rem, 3.6vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin: 0 0 0.75rem;
    color: var(--ab-fg);
}
.ab-h3 {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.01em;
    margin: 0 0 0.5rem;
    color: var(--ab-fg);
}
.ab-h4 {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.4;
    margin: 0 0 0.375rem;
    color: var(--ab-fg);
}
.ab-lead {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--ab-muted-fg);
    margin: 0;
    max-width: 42rem;
}
.ab-muted {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--ab-muted-fg);
    margin: 0;
}
.ab-h2-inverse { color: #fff; }
.ab-lead-inverse { color: hsl(0 0% 90%); }

/* ============================================================
   Eyebrow / Badge / Chip
   ============================================================ */
.ab-badge,
.ab-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    background: var(--ab-muted);
    color: var(--ab-muted-fg);
    border: 1px solid var(--ab-border);
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    text-transform: none;
    margin-bottom: 1rem;
    width: max-content;
}
.ab-eyebrow-accent {
    background: var(--ab-fg);
    color: var(--ab-primary-fg);
    border-color: var(--ab-fg);
}
.ab-eyebrow-light {
    background: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.95);
    border-color: rgba(255,255,255,0.2);
}
.ab-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.55rem;
    background: var(--ab-muted);
    color: var(--ab-muted-fg);
    border: 1px solid var(--ab-border);
    border-radius: 9999px;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* ============================================================
   Buttons
   ============================================================ */
.ab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6875rem 1.125rem;
    border-radius: var(--ab-radius);
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color 140ms, color 140ms, border-color 140ms, transform 140ms;
    white-space: nowrap;
}
.ab-btn svg { flex-shrink: 0; }

.ab-btn-primary {
    background: var(--ab-primary);
    color: var(--ab-primary-fg);
    border-color: var(--ab-primary);
}
.ab-btn-primary:hover {
    background: hsl(240 5.9% 18%);
    border-color: hsl(240 5.9% 18%);
}

.ab-btn-outline {
    background: transparent;
    color: var(--ab-fg);
    border-color: var(--ab-border-strong);
}
.ab-btn-outline:hover {
    background: var(--ab-muted);
    border-color: var(--ab-fg);
}

.ab-btn-inverse {
    background: #fff;
    color: var(--ab-fg);
    border-color: #fff;
}
.ab-btn-inverse:hover {
    background: hsl(0 0% 92%);
    border-color: hsl(0 0% 92%);
}

.ab-btn-ghost-light {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.35);
}
.ab-btn-ghost-light:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
}

.ab-btn-lg {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
}

.ab-cta-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}
.ab-cta-center { justify-content: center; }

/* ============================================================
   Card
   ============================================================ */
.ab-card {
    background: var(--ab-card);
    border: 1px solid var(--ab-border);
    border-radius: var(--ab-radius-lg);
    padding: 1.5rem;
    transition: border-color 140ms, box-shadow 140ms, transform 140ms;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
}
a.ab-card:hover {
    border-color: var(--ab-fg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.04);
}

/* ============================================================
   Section spacing
   ============================================================ */
.ab > section {
    padding: 5rem 0;
}
.ab-section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 3rem;
}
.ab-section-head .ab-eyebrow,
.ab-section-head .ab-badge {
    margin-left: auto;
    margin-right: auto;
}
.ab-section-head .ab-lead { margin: 0 auto; }

/* ============================================================
   1. HERO
   ============================================================ */
.ab-hero {
    padding: 6rem 0 5rem !important;
    border-bottom: 1px solid var(--ab-border);
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(1200px 600px at 50% -200px, hsl(240 5% 96%) 0%, transparent 70%),
        linear-gradient(180deg, hsl(0 0% 100%) 0%, hsl(0 0% 99%) 100%);
}
.ab-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, hsl(240 5% 93%) 1px, transparent 1px),
        linear-gradient(to bottom, hsl(240 5% 93%) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    opacity: 0.5;
    pointer-events: none;
}
.ab-hero-inner {
    position: relative;
    text-align: center;
}
.ab-hero-inner .ab-badge { margin-left: auto; margin-right: auto; }

.ab-hero-title {
    font-size: clamp(2rem, 5.5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.035em;
    margin: 0 auto 1.25rem;
    max-width: 48rem;
    color: var(--ab-fg);
}
.ab-hero-subtitle {
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    color: var(--ab-muted-fg);
    max-width: 42rem;
    margin: 0 auto 2rem;
    line-height: 1.65;
}
.ab-hero .ab-cta-group {
    justify-content: center;
    margin-bottom: 3.5rem;
}

.ab-hero-stats {
    display: inline-flex;
    align-items: center;
    gap: 2rem;
    padding: 1.25rem 2rem;
    background: var(--ab-card);
    border: 1px solid var(--ab-border);
    border-radius: var(--ab-radius-lg);
    box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
.ab-stat {
    text-align: center;
}
.ab-stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--ab-fg);
    letter-spacing: -0.02em;
    line-height: 1;
}
.ab-stat-value span {
    font-size: 1rem;
    color: var(--ab-muted-fg);
    font-weight: 600;
    margin-left: 0.125rem;
}
.ab-stat-label {
    font-size: 0.75rem;
    color: var(--ab-muted-fg);
    margin-top: 0.25rem;
    letter-spacing: 0.01em;
}
.ab-stat-divider {
    width: 1px;
    height: 2rem;
    background: var(--ab-border);
}

/* ============================================================
   2. EVENT
   ============================================================ */
.ab-event {
    background: var(--ab-muted);
    border-bottom: 1px solid var(--ab-border);
}
.ab-event-card {
    background: var(--ab-card);
    border: 1px solid var(--ab-border);
    border-radius: var(--ab-radius-xl);
    padding: 3.5rem 2.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02), 0 8px 24px rgba(0,0,0,0.04);
}
.ab-event-head {
    text-align: center;
    margin-bottom: 2.5rem;
}
.ab-event-head .ab-eyebrow { margin-left: auto; margin-right: auto; }
.ab-event-head .ab-lead { margin: 0 auto; }

.ab-perk-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 2.5rem;
}
.ab-perk {
    padding: 1.5rem;
    border: 1px solid var(--ab-border);
    border-radius: var(--ab-radius-lg);
    background: var(--ab-card);
    transition: border-color 140ms;
    min-width: 0;
}
.ab-perk h3,
.ab-perk p {
    overflow-wrap: anywhere;
}
.ab-perk:hover {
    border-color: var(--ab-fg);
}
.ab-perk-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--ab-radius);
    background: var(--ab-fg);
    color: var(--ab-primary-fg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.ab-event-meta {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1rem 1.25rem;
    background: var(--ab-muted);
    border-radius: var(--ab-radius);
    flex-wrap: wrap;
}
.ab-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--ab-fg);
    font-weight: 500;
}
.ab-meta-item svg { color: var(--ab-muted-fg); }

.ab-event-cta {
    text-align: center;
}

/* ============================================================
   3. MODES
   ============================================================ */
.ab-mode-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}
.ab-mode {
    min-height: 280px;
}
.ab-mode-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}
.ab-mode-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--ab-radius);
    background: var(--ab-muted);
    color: var(--ab-fg);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--ab-border);
}
.ab-mode .ab-muted {
    flex-grow: 1;
    margin-bottom: 1rem;
}
.ab-mode-celebs {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.375rem;
    margin-bottom: 1rem;
}
.ab-mode-celebs img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 50%;
    border: 1px solid var(--ab-border);
    background: var(--ab-muted);
}
.ab-mode-procs {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}
.ab-mode-procs li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    color: var(--ab-fg);
}
.ab-mode-procs li svg {
    color: var(--ab-fg);
    flex-shrink: 0;
}
.ab-mode-procs .ab-more {
    color: var(--ab-muted-fg);
    font-size: 0.75rem;
    padding-left: 1.25rem;
    margin-top: 0.125rem;
}
.ab-mode-prompts {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    margin-bottom: 1rem;
}
.ab-mode-prompts span {
    padding: 0.625rem 0.75rem;
    background: var(--ab-muted);
    border: 1px solid var(--ab-border);
    border-radius: var(--ab-radius-sm);
    font-size: 0.8125rem;
    color: var(--ab-fg);
    font-style: italic;
    line-height: 1.5;
}
.ab-card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding-top: 1rem;
    margin-top: auto;
    border-top: 1px solid var(--ab-border);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--ab-fg);
}
.ab-card-foot svg {
    transition: transform 140ms;
}
a.ab-card:hover .ab-card-foot svg {
    transform: translateX(2px);
}

/* ============================================================
   4. HOW IT WORKS
   ============================================================ */
.ab-how {
    background: var(--ab-muted);
    border-top: 1px solid var(--ab-border);
    border-bottom: 1px solid var(--ab-border);
}
.ab-steps {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}
.ab-step {
    background: var(--ab-card);
    border: 1px solid var(--ab-border);
    border-radius: var(--ab-radius-lg);
    padding: 1.75rem 1.5rem;
    position: relative;
}
.ab-step-num {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--ab-muted-fg);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.05em;
}
.ab-step-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--ab-radius);
    background: var(--ab-fg);
    color: var(--ab-primary-fg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}
.ab-how-note {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    background: var(--ab-card);
    border: 1px solid var(--ab-border);
    border-radius: 9999px;
    font-size: 0.8125rem;
    color: var(--ab-muted-fg);
    margin: 0 auto;
}
.ab-how .ab-container {
    text-align: center;
}

/* ============================================================
   5. TECH
   ============================================================ */
.ab-tech-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}
.ab-tech-item {
    padding: 1.5rem;
}
.ab-tech-item .ab-muted { margin-top: 0.25rem; font-size: 0.8125rem; }
.ab-tech-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--ab-radius-sm);
    background: var(--ab-muted);
    color: var(--ab-fg);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--ab-border);
    margin-bottom: 1rem;
}

/* ============================================================
   6. PARTNERSHIP
   ============================================================ */
.ab-partnership {
    padding: 0 !important;
}
.ab-partnership .ab-container {
    padding-top: 4rem;
    padding-bottom: 4rem;
}
.ab-partnership-card {
    background: var(--ab-fg);
    border-radius: var(--ab-radius-xl);
    padding: 4rem 2rem;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}
.ab-partnership-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(255,255,255,0.04) 0%, transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(255,255,255,0.03) 0%, transparent 40%);
    pointer-events: none;
}
.ab-partnership-card > * { position: relative; }
.ab-partnership-card .ab-eyebrow { margin-left: auto; margin-right: auto; }
.ab-partnership-card .ab-lead { margin: 0 auto 2rem; }

/* ============================================================
   7. FAQ
   ============================================================ */
.ab-faq-list {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}
.ab-faq-item {
    background: var(--ab-card);
    border: 1px solid var(--ab-border);
    border-radius: var(--ab-radius);
    overflow: hidden;
    transition: border-color 140ms;
}
.ab-faq-item:hover {
    border-color: var(--ab-border-strong);
}
.ab-faq-item[open] {
    border-color: var(--ab-fg);
}
.ab-faq-item summary {
    padding: 1rem 1.25rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    list-style: none;
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--ab-fg);
    line-height: 1.5;
}
.ab-faq-item summary::-webkit-details-marker { display: none; }
.ab-faq-q {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    flex: 1;
}
.ab-faq-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--ab-muted);
    color: var(--ab-muted-fg);
    border-radius: var(--ab-radius-sm);
    font-size: 0.6875rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 1px;
}
.ab-faq-item[open] .ab-faq-num {
    background: var(--ab-fg);
    color: var(--ab-primary-fg);
}
.ab-faq-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ab-muted-fg);
    transition: transform 200ms;
    flex-shrink: 0;
}
.ab-faq-item[open] .ab-faq-toggle {
    transform: rotate(45deg);
    color: var(--ab-fg);
}
.ab-faq-a {
    padding: 0 1.25rem 1.25rem 3rem;
    color: var(--ab-muted-fg);
    font-size: 0.875rem;
    line-height: 1.7;
}

/* ============================================================
   8. FINAL CTA
   ============================================================ */
.ab-final {
    background: var(--ab-muted);
    border-top: 1px solid var(--ab-border);
    text-align: center;
}
.ab-final .ab-h2 { margin-bottom: 0.75rem; }
.ab-final .ab-lead {
    margin: 0 auto 2rem;
    max-width: 36rem;
}

/* ============================================================
   RESPONSIVE — Mobile-first optimization
   ============================================================ */
@media (max-width: 1024px) {
    .ab-tech-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    .ab-container { padding: 0 20px; }
    .ab > section { padding: 3.5rem 0; }
    .ab-hero { padding: 4.5rem 0 3.5rem !important; }
    .ab-hero .ab-cta-group { margin-bottom: 2.5rem; }
    .ab-section-head { margin-bottom: 2rem; }

    .ab-mode-grid {
        grid-template-columns: 1fr;
    }
    .ab-perk-grid {
        grid-template-columns: 1fr;
    }
    .ab-steps {
        grid-template-columns: 1fr;
    }
    .ab-event-card {
        padding: 2.5rem 1.5rem;
    }

    .ab-hero-stats {
        display: flex;
        gap: 1rem;
        padding: 1rem 1.25rem;
        width: auto;
        max-width: 100%;
        justify-content: space-between;
    }
    .ab-stat-value { font-size: 1.375rem; }
    .ab-stat-label { font-size: 0.6875rem; }

    .ab-cta-group {
        flex-direction: column;
        align-items: stretch;
    }
    .ab-cta-center { align-items: center; }
    .ab-btn { width: 100%; }
    .ab-cta-center .ab-btn { width: auto; min-width: 260px; }

    .ab-partnership-card {
        padding: 3rem 1.5rem;
        border-radius: var(--ab-radius-lg);
    }
    .ab-partnership .ab-container {
        padding-top: 2.5rem;
        padding-bottom: 2.5rem;
    }
}

@media (max-width: 480px) {
    .ab-container { padding: 0 16px; }
    .ab > section { padding: 3rem 0; }
    .ab-hero { padding: 3.5rem 0 3rem !important; }

    .ab-hero-title {
        font-size: 1.875rem;
        letter-spacing: -0.025em;
    }
    .ab-h2 { font-size: 1.5rem; }
    .ab-h3 { font-size: 1.125rem; }

    .ab-card,
    .ab-step,
    .ab-perk { padding: 1.25rem; }

    .ab-event-card { padding: 2rem 1.25rem; }
    .ab-event-head { margin-bottom: 2rem; }

    .ab-mode-celebs {
        grid-template-columns: repeat(6, 1fr);
        gap: 0.25rem;
    }

    .ab-faq-item summary {
        padding: 0.875rem 1rem;
        font-size: 0.875rem;
    }
    .ab-faq-a {
        padding: 0 1rem 1rem 2.75rem;
        font-size: 0.8125rem;
    }
    .ab-faq-num {
        width: 22px;
        height: 22px;
        font-size: 0.625rem;
    }

    .ab-hero-stats {
        gap: 0.5rem;
        padding: 0.875rem 1rem;
    }
    .ab-stat-divider { height: 1.75rem; }

    .ab-event-meta {
        flex-direction: column;
        gap: 0.625rem;
        align-items: flex-start;
    }
}

/* ============================================================
   Accessibility: reduced motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    .ab-btn,
    .ab-card,
    .ab-card-foot svg,
    .ab-faq-item,
    .ab-faq-toggle {
        transition: none !important;
    }
}