/* Certification Section Styles */
.certification-section {
    position: relative;
    padding-top: 100px;
    padding-bottom: 100px;
    background: var(--bg-light);
    border-top: 1px solid var(--border-light);
}

.certification-section .section-header {
    max-width: 820px;
    margin: 0 auto 56px;
}

.certification-section .section-header h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    margin-bottom: 16px;
}

.certification-section .section-header .subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Principles Grid */
.cert-principles {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto 80px;
}

.cert-principle {
    background: var(--bg-white);
    border-radius: 20px;
    padding: 28px 24px;
    border: 1px solid var(--border-light);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cert-principle:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.05);
}

.cert-principle-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gradient-brand);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.cert-principle h4 {
    font-size: 1.05rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.cert-principle p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.55;
}

/* Tier Badges Container */
.cert-tiers {
    display: flex;
    flex-direction: column;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

/* Individual Tier Card */
.cert-tier {
    background: var(--bg-white);
    border-radius: 28px;
    padding: 48px;
    border: 1px solid var(--border-light);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 48px;
    align-items: start;
    position: relative;
    overflow: hidden;
}

.cert-tier::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--tier-color, var(--primary-color));
}

/* Tier-specific accent colors */
.cert-tier.tier-bronze { --tier-color: #B8784A; --tier-color-soft: #F5E8D8; }
.cert-tier.tier-silver { --tier-color: #8E97A4; --tier-color-soft: #E8EBF0; }
.cert-tier.tier-gold   { --tier-color: #D4A441; --tier-color-soft: #F8ECCB; }
.cert-tier.tier-diamond { --tier-color: #4FA8CF; --tier-color-soft: #D8ECF7; }

/* Badge Medallion */
.cert-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: sticky;
    top: 100px;
}

.cert-badge-medallion {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, var(--tier-color-soft), var(--tier-color));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    box-shadow:
        0 20px 40px rgba(0, 0, 0, 0.12),
        inset 0 4px 10px rgba(255, 255, 255, 0.5),
        inset 0 -4px 10px rgba(0, 0, 0, 0.15);
    position: relative;
}

.cert-badge-medallion::before {
    content: '';
    position: absolute;
    inset: 10px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.4);
}

.cert-badge-medallion svg {
    width: 80px;
    height: 80px;
    color: #fff;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.cert-badge-label {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--tier-color);
    font-weight: 700;
    margin-bottom: 4px;
}

.cert-badge-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.2;
}

.cert-badge-meta {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    width: 100%;
}

.cert-badge-meta-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 12px;
    background: var(--bg-light);
    border-radius: 8px;
}

.cert-badge-meta-item strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Tier Content */
.cert-tier-content h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.cert-tier-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 28px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-light);
}

.cert-tier-block {
    margin-bottom: 24px;
}

.cert-tier-block:last-child {
    margin-bottom: 0;
}

.cert-tier-block h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--tier-color);
    font-weight: 700;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.cert-tier-block h4::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--tier-color);
}

.cert-tier-block p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.cert-tier-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cert-tier-list li {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.55;
    padding-left: 22px;
    position: relative;
}

.cert-tier-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5em;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--tier-color-soft);
    border: 2px solid var(--tier-color);
}

/* Validity Table */
.cert-validity {
    max-width: 1000px;
    margin: 80px auto 0;
}

.cert-validity h3 {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 24px;
}

.cert-validity-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--bg-white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.cert-validity-table th,
.cert-validity-table td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.95rem;
}

.cert-validity-table th {
    background: var(--bg-white);
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
}

.cert-validity-table tr:last-child td {
    border-bottom: none;
}

.cert-validity-table .tier-cell {
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.cert-validity-table .tier-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.tier-dot-bronze { background: #B8784A; }
.tier-dot-silver { background: #8E97A4; }
.tier-dot-gold { background: #D4A441; }
.tier-dot-diamond { background: #4FA8CF; }

/* Usage Rules */
.cert-usage {
    max-width: 1000px;
    margin: 64px auto 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.cert-usage-card {
    background: var(--bg-white);
    border-radius: 20px;
    padding: 32px;
    border: 1px solid var(--border-light);
}

.cert-usage-card.allowed {
    border-left: 4px solid var(--primary-color);
}

.cert-usage-card.restricted {
    border-left: 4px solid #E47D5A;
}

.cert-usage-card h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.cert-usage-card ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.cert-usage-card li {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.55;
    padding-left: 22px;
    position: relative;
}

.cert-usage-card.allowed li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary-color);
    font-weight: 700;
}

.cert-usage-card.restricted li::before {
    content: '✕';
    position: absolute;
    left: 0;
    top: 0;
    color: #E47D5A;
    font-weight: 700;
}

/* Responsive */
@media (max-width: 1024px) {
    .cert-principles {
        grid-template-columns: repeat(2, 1fr);
    }

    .cert-tier {
        grid-template-columns: 1fr;
        gap: 32px;
        padding: 36px;
    }

    .cert-badge {
        position: static;
        flex-direction: row;
        align-items: flex-start;
        text-align: left;
        gap: 24px;
    }

    .cert-badge-medallion {
        width: 130px;
        height: 130px;
        margin-bottom: 0;
        flex-shrink: 0;
    }

    .cert-badge-medallion svg {
        width: 56px;
        height: 56px;
    }

    .cert-badge-info {
        flex: 1;
    }
}

@media (max-width: 768px) {
    .certification-section {
        padding-top: 72px;
        padding-bottom: 72px;
    }

    .cert-tier {
        padding: 28px;
        border-radius: 20px;
    }

    .cert-badge {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .cert-usage {
        grid-template-columns: 1fr;
    }

    .cert-validity-table {
        font-size: 0.85rem;
    }

    .cert-validity-table th,
    .cert-validity-table td {
        padding: 12px 14px;
    }
}

@media (max-width: 600px) {
    .cert-principles {
        grid-template-columns: 1fr;
    }

    .cert-validity-table thead {
        display: none;
    }

    .cert-validity-table,
    .cert-validity-table tbody,
    .cert-validity-table tr,
    .cert-validity-table td {
        display: block;
        width: 100%;
    }

    .cert-validity-table tr {
        padding: 16px;
        border-bottom: 1px solid var(--border-light);
    }

    .cert-validity-table td {
        padding: 6px 0;
        border: none;
        display: flex;
        justify-content: space-between;
    }

    .cert-validity-table td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--text-primary);
        text-transform: uppercase;
        font-size: 0.72rem;
        letter-spacing: 0.08em;
    }
}