/* ============================================================
   NoCloud AquaHub — About Page Styles (about.css)
   ============================================================ */

/* --- Page Hero ---------------------------------------------- */
.about-hero {
    padding: 100px 0 40px;
    position: relative;
    overflow: hidden;
}

.about-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 50% at 30% 80%, rgba(14,165,233,0.06) 0%, transparent 60%),
        radial-gradient(ellipse 50% 40% at 70% 20%, rgba(34,211,238,0.04) 0%, transparent 50%);
    pointer-events: none;
}

.about-hero .section-header {
    position: relative;
    z-index: 1;
    margin-bottom: 0;
}

.about-hero .section-title {
    font-size: 2.75rem;
}


/* --- Philosophy Section ------------------------------------- */
.about-philosophy {
    background: var(--bg-secondary);
}

.philosophy-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.philosophy-content .section-label {
    margin-bottom: 16px;
}

.philosophy-content .section-title {
    margin-bottom: 28px;
}

.philosophy-text h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--teal-primary);
    margin-bottom: 12px;
    margin-top: 24px;
}

.philosophy-text h3:first-child {
    margin-top: 0;
}

.philosophy-text p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.philosophy-visual {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding-top: 20px;
}

.philosophy-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: all var(--transition-base);
}

.philosophy-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

.philosophy-card-icon {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: rgba(14,165,233,0.1);
    color: var(--teal-primary);
    font-size: 1.25rem;
    margin-bottom: 16px;
}

.philosophy-ban {
    position: absolute;
    font-size: 2.5rem;
    color: #ef4444;
    opacity: 0.7;
}

.philosophy-card h4 {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: 8px;
}

.philosophy-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
}


/* --- System Section ----------------------------------------- */
.about-system {
    position: relative;
}

.system-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.system-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.system-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.system-card--core::before {
    background: linear-gradient(90deg, transparent, var(--teal-primary), transparent);
}

.system-card--module::before {
    background: linear-gradient(90deg, transparent, var(--seafoam), transparent);
}

.system-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.system-card:hover::before {
    opacity: 1;
}

.system-card-header {
    margin-bottom: 16px;
}

.system-badge {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
}

.system-badge--core {
    background: rgba(14,165,233,0.12);
    color: var(--teal-primary);
    border: 1px solid rgba(14,165,233,0.2);
}

.system-badge--module {
    background: rgba(45,212,191,0.12);
    color: var(--seafoam);
    border: 1px solid rgba(45,212,191,0.2);
}

.system-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: var(--radius-sm);
    background: rgba(14,165,233,0.1);
    color: var(--teal-primary);
    font-size: 1.25rem;
    margin-bottom: 16px;
}

.system-card--module .system-card-icon {
    background: rgba(45,212,191,0.1);
    color: var(--seafoam);
}

.system-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 8px;
}

.system-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.system-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 32px;
    padding: 16px 24px;
    background: rgba(14,165,233,0.06);
    border: 1px solid rgba(14,165,233,0.1);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
}

.system-note i {
    color: var(--teal-primary);
    font-size: 1.125rem;
}


/* --- Values Section ----------------------------------------- */
.about-values {
    background: var(--bg-secondary);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.value-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition-base);
}

.value-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.value-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    border-radius: 50%;
    font-size: 1.25rem;
}

.value-icon--privacy {
    background: rgba(14,165,233,0.1);
    color: var(--teal-primary);
}

.value-icon--cost {
    background: rgba(249,115,22,0.1);
    color: var(--coral);
}

.value-icon--quality {
    background: rgba(168,85,247,0.1);
    color: #a855f7;
}

.value-icon--community {
    background: rgba(45,212,191,0.1);
    color: var(--seafoam);
}

.value-card h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 10px;
}

.value-card p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}


/* --- CTA ---------------------------------------------------- */
.about-cta {
    position: relative;
    text-align: center;
    padding: 96px 0;
    overflow: hidden;
}

.about-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 50% 100%, rgba(14,165,233,0.1) 0%, transparent 60%);
    pointer-events: none;
}

.about-cta-content {
    position: relative;
    z-index: 1;
}

.about-cta h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.about-cta p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.about-cta-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}


/* --- Responsive --------------------------------------------- */
@media (max-width: 1024px) {
    .philosophy-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .philosophy-visual {
        padding-top: 0;
        flex-direction: row;
    }

    .philosophy-card {
        flex: 1;
    }

    .values-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .about-hero {
        padding: 80px 0 24px;
    }

    .about-hero .section-title {
        font-size: 2rem;
    }

    .philosophy-visual {
        flex-direction: column;
    }

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

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

    .about-cta {
        padding: 64px 0;
    }

    .about-cta h2 {
        font-size: 1.875rem;
    }

    .about-cta-actions {
        flex-direction: column;
        align-items: stretch;
    }
}