.atc-success-backdrop {
    position: fixed;
    inset: 0;
    z-index: 12000;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding:
        max(var(--site-header-offset, 98px), 20px)
        max(20px, env(safe-area-inset-right))
        max(20px, env(safe-area-inset-bottom))
        max(20px, env(safe-area-inset-left));
    background: rgba(15, 42, 68, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: atc-success-fade-in 0.25s ease-out;
    box-sizing: border-box;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
}

.atc-success-modal {
    position: relative;
    width: min(100%, 420px);
    max-height: calc(100vh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 40px);
    max-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 40px);
    margin: auto;
    flex-shrink: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 28px 24px 22px;
    border-radius: 20px;
    background: linear-gradient(160deg, #ffffff 0%, #f4fbfc 100%);
    box-shadow: 0 24px 60px rgba(15, 42, 68, 0.22);
    text-align: center;
    animation: atc-success-slide-up 0.3s ease-out;
    box-sizing: border-box;
}

.atc-success-close {
    position: absolute;
    top: 12px;
    inset-inline-end: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    min-width: 44px;
    min-height: 44px;
    border: none;
    border-radius: 999px;
    background: rgba(15, 42, 68, 0.06);
    color: var(--navy, #0F2A44);
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.atc-success-close:hover {
    background: rgba(43, 184, 200, 0.15);
    color: var(--teal, #2BB8C8);
}

.atc-success-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    margin: 0 auto 14px;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(43, 184, 200, 0.18), rgba(43, 184, 200, 0.08));
    color: var(--teal, #2BB8C8);
    flex-shrink: 0;
}

.atc-success-title {
    margin: 0 0 8px;
    padding-inline: 28px;
    font-size: clamp(1.1rem, 4.5vw, 1.35rem);
    font-weight: 800;
    color: var(--navy, #0F2A44);
    line-height: 1.25;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.atc-success-message {
    margin: 0 0 22px;
    padding-inline: 4px;
    font-size: clamp(0.875rem, 3.6vw, 0.95rem);
    line-height: 1.55;
    color: rgba(15, 42, 68, 0.72);
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.atc-success-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.atc-success-btn {
    border-radius: 14px;
    padding: 14px 12px;
    min-height: 48px;
    font-size: clamp(0.875rem, 3.6vw, 0.95rem);
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.15s, border-color 0.2s, background 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
    width: 100%;
    min-width: 0;
    overflow-wrap: break-word;
    word-wrap: break-word;
    -webkit-tap-highlight-color: transparent;
}

.atc-success-btn--primary {
    border: none;
    background: linear-gradient(135deg, var(--teal, #2BB8C8), var(--teal-dark, #1A9BAF));
    color: #fff;
    box-shadow: 0 8px 20px rgba(43, 184, 200, 0.25);
}

.atc-success-btn--primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgba(43, 184, 200, 0.32);
}

.atc-success-btn--secondary {
    border: 2px solid rgba(43, 184, 200, 0.35);
    background: white;
    color: var(--navy, #0F2A44);
}

.atc-success-btn--secondary:hover {
    transform: translateY(-1px);
    border-color: var(--teal, #2BB8C8);
    box-shadow: 0 8px 20px rgba(43, 184, 200, 0.18);
}

@keyframes atc-success-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes atc-success-slide-up {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 520px) {
    .atc-success-backdrop {
        padding:
            max(var(--site-header-offset, 90px), 12px)
            max(12px, env(safe-area-inset-right))
            max(12px, env(safe-area-inset-bottom))
            max(12px, env(safe-area-inset-left));
    }

    .atc-success-modal {
        padding: 24px 16px 18px;
        border-radius: 16px;
        max-height: calc(100vh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 24px);
        max-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 24px);
    }

    .atc-success-title {
        padding-inline: 24px;
    }

    .atc-success-actions {
        grid-template-columns: 1fr;
    }
}