*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #FFFFFF;
    color: #1A1A1A;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
}

/* ----- Header ----- */
.att-header {
    background: #FFFFFF;
    border-bottom: 1px solid #E5E5E5;
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.att-logo-img {
    height: 72px;
    width: auto;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.header-link {
    color: #1A1A1A;
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color 0.15s;
    padding: 0.5rem 0;
}

.header-link:hover {
    color: #009FDB;
}

/* ----- Hero Banner ----- */
.hero-banner {
    background: #F8F8F8;
    padding: 5rem 2rem;
}

.hero-content {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.hero-kicker {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #009FDB;
    margin-bottom: 1rem;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 800;
    color: #1A1A1A;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
}

.hero-desc {
    font-size: 1.1875rem;
    color: #555;
    line-height: 1.7;
    max-width: 560px;
    margin: 0 auto;
}

/* ----- Section Shared ----- */
.section-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 5rem 2rem;
}

.section-inner h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: #1A1A1A;
    text-align: center;
    letter-spacing: -0.015em;
    margin-bottom: 2.5rem;
}

.section-sub {
    text-align: center;
    font-size: 1.0625rem;
    color: #666;
    max-width: 520px;
    margin: -1.5rem auto 3rem;
    line-height: 1.6;
}

/* ----- Benefits ----- */
.benefits-section {
    background: #FFFFFF;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.benefit-card {
    background: #FFFFFF;
    border: 1px solid #EBEBEB;
    border-radius: 12px;
    padding: 2rem;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.benefit-card:hover {
    border-color: #009FDB;
    box-shadow: 0 2px 16px rgba(0,159,219,0.06);
}

.benefit-card h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    color: #1A1A1A;
    margin-bottom: 0.5rem;
}

.benefit-card p {
    font-size: 0.9375rem;
    color: #666;
    line-height: 1.6;
    margin: 0;
}

/* ----- Steps ----- */
.steps-section {
    background: #FAFAFA;
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
}

.step-card {
    background: #FFFFFF;
    border: 1px solid #EBEBEB;
    border-radius: 12px;
    padding: 1.75rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    width: 260px;
    align-self: stretch;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.step-card:hover {
    border-color: #009FDB;
    box-shadow: 0 2px 16px rgba(0,159,219,0.06);
}

.step-marker {
    width: 36px;
    height: 36px;
    background: #009FDB;
    color: #FFFFFF;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.step-body h3 {
    font-size: 0.9375rem;
    font-weight: 700;
    color: #1A1A1A;
    margin-bottom: 0.375rem;
    margin-top: 0.3125rem;
}

.step-body p {
    font-size: 0.875rem;
    color: #666;
    line-height: 1.5;
    margin: 0;
}

.step-body kbd {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.8125rem;
    font-weight: 600;
    color: #1A1A1A;
    background: #F0F0F0;
    border: 1px solid #D5D5D5;
    border-radius: 4px;
}

.step-arrow {
    flex-shrink: 0;
    padding: 0 0.5rem;
}

/* ----- Clipboard Banner ----- */
.clipboard-banner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    padding: 1rem 1.5rem;
    background: #F0F8FF;
    border: 1px solid #B8D8F0;
    border-radius: 10px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: #009FDB;
    text-align: center;
}

.clipboard-banner svg {
    flex-shrink: 0;
}

/* ----- Security Section ----- */
.security-section {
    background: #FFFFFF;
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

.security-card {
    background: #FFFFFF;
    border: 1px solid #EBEBEB;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.security-card:hover {
    border-color: #009FDB;
    box-shadow: 0 2px 16px rgba(0,159,219,0.06);
}

.security-card h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    color: #1A1A1A;
    margin-bottom: 0.625rem;
}

.security-card p {
    font-size: 0.9375rem;
    color: #666;
    line-height: 1.6;
    margin: 0;
}

.security-next {
    text-align: center;
    margin-top: 2.5rem;
}

/* ----- PIN Setup ----- */
.pin-page-section {
    background: #FAFAFA;
}

.pin-form {
    max-width: 420px;
    margin: 0 auto;
    text-align: center;
}

.pin-inputs {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.pin-digit {
    width: 56px;
    height: 64px;
    text-align: center;
    font-family: 'Inter', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: #1A1A1A;
    background: #FFFFFF;
    border: 2px solid #D5D5D5;
    border-radius: 10px;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
    -moz-appearance: textfield;
}

.pin-digit::-webkit-outer-spin-button,
.pin-digit::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.pin-digit:focus {
    border-color: #009FDB;
    box-shadow: 0 0 0 3px rgba(0,159,219,0.15);
}

.pin-digit.filled {
    border-color: #009FDB;
    background: #F0F8FF;
}

.pin-hint {
    font-size: 0.875rem;
    color: #999;
    margin-bottom: 1.75rem;
}

.pin-continue-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 2.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: #FFFFFF;
    background: #B8B8B8;
    border: none;
    border-radius: 10px;
    text-decoration: none;
    cursor: default;
    transition: background 0.2s, transform 0.15s;
    pointer-events: none;
}

.pin-continue-btn--ready {
    background: #009FDB;
    cursor: pointer;
    pointer-events: auto;
}

.pin-continue-btn--ready:hover {
    background: #0088C0;
    transform: translateY(-1px);
}

.pin-continue-btn--ready:active {
    transform: translateY(0);
}

.pin-continue-btn:disabled {
    opacity: 0.7;
    cursor: wait;
}

/* ----- PIN Success ----- */
.pin-success {
    text-align: center;
    padding: 2rem 0;
}

.pin-success svg {
    margin-bottom: 1.25rem;
}

.pin-success h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1A1A1A;
    margin-bottom: 0.5rem;
}

.pin-success p {
    font-size: 1.0625rem;
    color: #666;
    margin: 0;
}

/* ----- Complete Success ----- */
.complete-success {
    background: #FAFAFA;
}

/* ----- Footer ----- */
.page-footer {
    background: #1A1A1A;
    padding: 3rem 2rem;
}

.footer-inner {
    max-width: 960px;
    margin: 0 auto;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.footer-link {
    color: #999;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.15s;
}

.footer-link:hover {
    color: #FFFFFF;
}

.footer-copy {
    color: #666;
    font-size: 0.8125rem;
}

/* ----- Responsive ----- */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-banner {
        padding: 3rem 1.25rem;
    }

    .section-inner {
        padding: 3rem 1.25rem;
    }

    .section-inner h2 {
        font-size: 1.75rem;
    }

    .benefits-grid,
    .security-grid {
        grid-template-columns: 1fr;
    }

    .steps-container {
        flex-direction: column;
        align-items: stretch;
    }

    .step-card {
        width: 100%;
    }

    .step-arrow {
        transform: rotate(90deg);
        padding: 0.25rem 0;
        align-self: center;
    }

    .header-container {
        padding: 0 1.25rem;
    }

    .header-nav {
        gap: 1.25rem;
    }

    .pin-inputs {
        gap: 0.5rem;
    }

    .pin-digit {
        width: 44px;
        height: 52px;
        font-size: 1.25rem;
    }
}