/* =========================================================
   ABOUT PAGE STYLES
   Self-contained. Built only on the website design system
   (System A) tokens + global components (.btn). No section
   design is shared with other pages.
========================================================= */

/* =========================================================
   LAYOUT PRIMITIVES (about-scoped)
========================================================= */
.about-wrap {
    max-width: 1120px;
    margin: 0 auto;
}

.about-wrap--narrow {
    max-width: 760px;
}

.about-eyebrow {
    display: inline-block;
    font-size: var(--text-sm);
    font-weight: var(--font-semi-bold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-primary);
}

.about-title {
    font-size: var(--text-3xl);
    line-height: var(--leading-tight);
    color: var(--text-primary);
}

.about-desc {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

/* Centered section heading */
.about-head {
    max-width: 720px;
    margin: 0 auto var(--space-16);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.about-head--left {
    margin-left: 0;
    text-align: left;
    align-items: flex-start;
}

.about-actions {
    display: flex;
    gap: var(--space-4);
}

/* =========================================================
   HERO
========================================================= */
.about-hero {
    padding: var(--space-32) var(--space-8) var(--space-24);
    background: radial-gradient(circle at 50% -20%, var(--color-primary-soft), transparent 60%);
    border-bottom: 1px solid var(--border-primary);
}

.about-hero-inner {
    max-width: 880px;
    margin: 0 auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
}

.about-hero-headline {
    font-size: clamp(var(--text-4xl), 5vw, 4rem);
    line-height: var(--leading-tight);
    color: var(--text-primary);
    max-width: 16ch;
}

.about-hero-headline span {
    color: var(--color-primary);
}

.about-hero-tagline {
    font-size: var(--text-lg);
    font-weight: var(--font-semi-bold);
    color: var(--color-secondary);
}

.about-hero-lead {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
    max-width: 680px;
}

.about-hero .about-actions {
    justify-content: center;
    margin-top: var(--space-2);
}

/* =========================================================
   MISSION  (sticky aside + flowing body)
========================================================= */
.about-mission {
    padding: var(--space-32) var(--space-8);
    background: var(--surface-primary);
}

.mission-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: var(--space-16);
    align-items: start;
}

.mission-aside {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    position: sticky;
    top: var(--space-24);
}

.mission-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.mission-body p {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

.mission-body em {
    color: var(--text-primary);
    font-style: italic;
}

/* =========================================================
   PROBLEM  (single grouped panel, hairline-divided rows)
========================================================= */
.about-problem {
    padding: var(--space-32) var(--space-8);
    background: linear-gradient(to bottom, var(--bg-secondary), var(--surface-primary));
    border-top: 1px solid var(--border-primary);
    border-bottom: 1px solid var(--border-primary);
}

.problem-panel {
    background: var(--surface-primary);
    border: 1px solid var(--border-primary);
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.problem-row {
    display: flex;
    align-items: flex-start;
    gap: var(--space-6);
    padding: var(--space-8) var(--space-10);
}

.problem-row + .problem-row {
    border-top: 1px solid var(--border-subtle);
}

.problem-row-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--color-primary-soft);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
}

.problem-row-text h3 {
    font-size: var(--text-xl);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.problem-row-text p {
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--text-muted);
    max-width: 60ch;
}

/* =========================================================
   PRINCIPLES  (numbered accent blocks)
========================================================= */
.about-principles {
    padding: var(--space-32) var(--space-8);
    background: var(--surface-primary);
}

.principle-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
}

.principle {
    position: relative;
    padding: var(--space-8) var(--space-8) var(--space-8) var(--space-10);
    background: var(--surface-secondary);
    border: 1px solid var(--border-primary);
    border-left: 3px solid var(--color-primary);
    border-radius: 0 14px 14px 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.principle:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
}

.principle-num {
    font-size: var(--text-sm);
    font-weight: var(--font-bold);
    letter-spacing: 0.1em;
    color: var(--color-primary);
}

.principle h3 {
    font-size: var(--text-xl);
    color: var(--text-primary);
}

.principle p {
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--text-muted);
}

/* =========================================================
   HOW IT FITS TOGETHER  (vertical timeline)
========================================================= */
.about-flow {
    padding: var(--space-32) var(--space-8);
    background: linear-gradient(to bottom, var(--surface-primary), var(--bg-secondary));
    border-top: 1px solid var(--border-primary);
}

.flow-timeline {
    display: flex;
    flex-direction: column;
}

.flow-step {
    position: relative;
    display: flex;
    gap: var(--space-6);
    padding-bottom: var(--space-10);
}

.flow-step:last-child {
    padding-bottom: 0;
}

/* connecting rail */
.flow-step::before {
    content: '';
    position: absolute;
    left: 23px;
    top: 48px;
    bottom: 0;
    width: 2px;
    background: var(--border-primary);
}

.flow-step:last-child::before {
    display: none;
}

.flow-marker {
    position: relative;
    z-index: 1;
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--surface-primary);
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
}

.flow-body {
    padding-top: var(--space-2);
}

.flow-body h3 {
    font-size: var(--text-xl);
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.flow-body p {
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--text-muted);
}

/* =========================================================
   WHAT WE'RE BUILDING  (sticky intro + linked list)
========================================================= */
.about-building {
    padding: var(--space-32) var(--space-8);
    background: var(--surface-primary);
    border-top: 1px solid var(--border-primary);
}

.building-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
}

.building-intro {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    position: sticky;
    top: var(--space-24);
}

.building-intro p {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

.building-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.building-item {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    padding: var(--space-5) var(--space-6);
    background: var(--surface-primary);
    border: 1px solid var(--border-primary);
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition-fast),
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
}

a.building-item:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.building-item-icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    border-radius: 10px;
    background: var(--color-primary-soft);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
}

.building-item-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    flex: 1;
}

.building-item-text strong {
    font-size: var(--text-base);
    font-weight: var(--font-bold);
    color: var(--text-primary);
}

.building-item-desc {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

.building-item-arrow {
    color: var(--text-muted);
    font-size: var(--text-sm);
    transition: transform var(--transition-fast), color var(--transition-fast);
}

a.building-item:hover .building-item-arrow {
    color: var(--color-primary);
    transform: translateX(3px);
}

.building-item--soon {
    opacity: 0.85;
}

.building-item-badge {
    font-size: var(--text-xs);
    font-weight: var(--font-semi-bold);
    color: var(--text-muted);
    background: var(--surface-active);
    border-radius: 999px;
    padding: var(--space-1) var(--space-3);
}

/* =========================================================
   CLOSING CTA
========================================================= */
.about-cta {
    padding: var(--space-24) var(--space-8) var(--space-32);
    background: linear-gradient(to bottom, var(--bg-secondary), var(--surface-primary));
    border-top: 1px solid var(--border-primary);
}

.about-cta-inner {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-5);
    padding: var(--space-16) var(--space-12);
    background: var(--surface-primary);
    border: 1px solid var(--border-primary);
    border-radius: 24px;
    box-shadow: var(--shadow-md);
}

.about-cta-title {
    font-size: var(--text-3xl);
    line-height: var(--leading-tight);
    color: var(--text-primary);
}

.about-cta-desc {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 560px;
}

.about-cta .about-actions {
    justify-content: center;
    margin-top: var(--space-2);
}

/* =========================================================
   RESPONSIVE
========================================================= */
@media (max-width: 1024px) {
    .mission-grid,
    .building-grid {
        grid-template-columns: 1fr;
        gap: var(--space-10);
    }

    .mission-aside,
    .building-intro {
        position: static;
    }
}

@media (max-width: 768px) {
    .about-hero {
        padding: var(--space-24) var(--space-5) var(--space-16);
    }

    .about-mission,
    .about-problem,
    .about-principles,
    .about-flow,
    .about-building {
        padding: var(--space-20) var(--space-5);
    }

    .principle-grid {
        grid-template-columns: 1fr;
    }

    .problem-row {
        padding: var(--space-6);
    }

    .about-cta {
        padding: var(--space-16) var(--space-5) var(--space-20);
    }

    .about-cta-inner {
        padding: var(--space-12) var(--space-6);
    }
}